CN115184158A - Fatigue testing machine for industrial and mining vehicle parts and materials and control method thereof - Google Patents

Fatigue testing machine for industrial and mining vehicle parts and materials and control method thereof Download PDF

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Publication number
CN115184158A
CN115184158A CN202210799955.2A CN202210799955A CN115184158A CN 115184158 A CN115184158 A CN 115184158A CN 202210799955 A CN202210799955 A CN 202210799955A CN 115184158 A CN115184158 A CN 115184158A
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China
Prior art keywords
displacement
strain
sample
sensor
axial force
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CN202210799955.2A
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Chinese (zh)
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CN115184158B (en
Inventor
汪永明
苏邦伟
曾立英
邱增华
肖富凯
郑玲
曾广金
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Mcc (xiangtan) Mining Equipment LLC
Xiangtan Commodity Quality Supervision And Inspection Institute
Xiangtan Electric Manufacturing Group Heavy Duty Equipment Co ltd
Xiangtan Industrial And Mining Electric Drive Vehicle Quality Inspection Center
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Mcc (xiangtan) Mining Equipment LLC
Xiangtan Commodity Quality Supervision And Inspection Institute
Xiangtan Electric Manufacturing Group Heavy Duty Equipment Co ltd
Xiangtan Industrial And Mining Electric Drive Vehicle Quality Inspection Center
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Priority to CN202210799955.2A priority Critical patent/CN115184158B/en
Publication of CN115184158A publication Critical patent/CN115184158A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00—Testing of machine parts
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M17/00—Testing of vehicles
    • G01M17/007—Wheeled or endless-tracked vehicles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G01N3/04—Chucks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0001—Type of application of the stress
    • G01N2203/0003—Steady
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0017—Tensile
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0019—Compressive
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
    • G01N2203/0073—Fatigue
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/067—Parameter measured for estimating the property
    • G01N2203/0676—Force, weight, load, energy, speed or acceleration
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/067—Parameter measured for estimating the property
    • G01N2203/0682—Spatial dimension, e.g. length, area, angle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

Abstract

The invention discloses a fatigue testing machine for industrial and mining vehicle parts and materials and a control method thereof, wherein the fatigue testing machine comprises a base, an upright post, a base frame, a lifting mechanism, a linear motion mechanism, a sample clamp, a dynamic load sensor, a micro-strain sensor and a human-computer interaction and control module; the upright post is arranged on the base, and the base frame is sleeved on the upright post; a lifting mechanism is arranged between the base frame and the base; a linear motion mechanism is arranged on the base frame; the sample clamp comprises a first clamp and a second clamp, the first clamp is arranged at the output end of the linear motion mechanism, and the second clamp is arranged on the base; one end of the dynamic load sensor is connected with the linear motion mechanism, and the other end of the dynamic load sensor is connected with the first chuck; the micro-strain sensor is arranged on the sample; the human-computer interaction and control module is electrically connected with the lifting mechanism, the linear motion mechanism, the sample clamp, the dynamic load sensor and the micro-strain sensor respectively. The invention can avoid misjudgment and misoperation and improve the reliability of the testing machine.

Description

Fatigue testing machine for industrial and mining vehicle parts and materials and control method thereof
Technical Field
The invention relates to a fatigue testing machine for industrial and mining vehicle parts and materials and a control method thereof.
Background
At present, in the field of fatigue tests of industrial and mining vehicle parts and materials, various materials or parts with mechanical properties need to be subjected to fatigue tests, and the materials comprise conventional metal materials, composite materials, synthetic materials and the like. The conventional fatigue testing machine (JB/T9397-2003 tension and compression fatigue testing machine technical conditions) has two modes of axial force control (GB/T3075-2008 metal material fatigue test axial force control method) and axial strain control (GB/T26077-2010 metal material fatigue test axial strain control method), but in parts or materials in certain special application fields, the force change is very small (can be seen as constant) in a certain strain change interval or the strain change is very small (can be seen as constant) in a certain force change range, and the situation that the fatigue testing machine and a sample are damaged due to wrong setting or judgment often occurs by adopting a single control mode (axial force control or axial strain control). Meanwhile, because the electromagnetic environment of a test site is complex, interference signals are often connected into the sensor system in series, and the fatigue testing machine malfunctions.
Disclosure of Invention
The invention aims to provide a fatigue testing machine for industrial and mining vehicle parts and materials and a control method thereof, which are used for solving the problems that the traditional axial force control or axial strain control is easy to cause damage to the testing machine or a sample caused by setting or judgment errors, and the testing machine malfunctions caused by interference.
The invention solves the technical problems through the following technical scheme: a fatigue testing machine for industrial and mining vehicle parts and materials is used for carrying out anti-fatigue test on a sample to be tested, and comprises:
a base;
the upright column is arranged on the base;
the base frame is sleeved on the upright post;
the lifting mechanism is arranged between the base frame and the base, and the base frame moves up and down along the upright post under the action of the lifting mechanism;
the linear motion mechanism is arranged on the base frame, and the output end of the linear motion mechanism penetrates through the base frame and extends towards the base;
the sample clamp comprises a first chuck and a second chuck, the first chuck is arranged at the output end of the linear motion mechanism, the second chuck is arranged on the base, and the first chuck is aligned with the second chuck;
one end of the dynamic load sensor is connected with the linear motion mechanism, and the other end of the dynamic load sensor is connected with the first chuck and is used for detecting the output pulling pressure of the linear motion mechanism;
the micro-strain sensor is arranged on the sample and used for detecting the strain displacement of the sample, and the sample is arranged between the first chuck and the second chuck;
and the human-computer interaction and control module is respectively electrically connected with the lifting mechanism, the linear motion mechanism, the sample clamp, the dynamic load sensor and the micro-strain sensor, is used for controlling the linear motion mechanism to act, and judges whether the fatigue test of the sample is finished according to the data collected by the dynamic load sensor or the micro-strain sensor.
According to the invention, under the mode of axial force control, whether a sample completes a single fatigue test is judged according to the pulling pressure output by the linear motion mechanism collected by the dynamic load sensor; under an axial strain control mode, judging whether the sample completes a single fatigue test according to the strain displacement of the sample collected by the micro-strain sensor; a time delay complex judgment mode is adopted when the single judgment is carried out, namely the time delay delta t is delayed under the condition that the signals acquired for the first time meet the condition i The acquired signals also need to meet the conditions, so that the problem that the testing machine or the sample is damaged due to judgment errors caused by signal interference is avoided, the misoperation of the testing machine is avoided, and the judgment and action accuracy is improved; the micro-strain sensor is arranged on the sample, can directly detect the micro-strain displacement of the sample, and greatly improves the detection precision of the sample strain.
Furthermore, the base frame is sleeved on the upright column and locked through a hydraulic locking mechanism, and a first pressure sensor electrically connected with the human-computer interaction and control module is arranged on the hydraulic locking mechanism; a second pressure sensor electrically connected with the human-computer interaction and control module is arranged on the first chuck, and a third pressure sensor electrically connected with the human-computer interaction and control module is arranged on the second chuck;
the man-machine interaction and control module is also used for judging whether the base frame locks the stand column according to the pressure signal acquired by the first pressure sensor; and the pressure sensor is used for judging whether the sample clamp clamps the sample according to the pressure signals collected by the second pressure sensor and the third pressure sensor.
Furthermore, an upper limit ring and a lower limit ring are arranged on the upright post, and travel switches electrically connected with the human-computer interaction and control module are arranged on the upper limit ring and the lower limit ring;
the man-machine interaction and control module is also used for judging whether the base frame exceeds the limit or not according to the trigger signal of the travel switch.
Furthermore, a displacement sensor electrically connected with the human-computer interaction and control module is arranged in the linear motion mechanism;
the human-computer interaction and control module is also used for judging whether the linear motion mechanism works in an effective travel range according to the displacement data acquired by the displacement sensor.
Further, the linear motion mechanism is a linear actuator.
Further, the micro strain sensor is an extensometer.
Based on the same inventive concept, the invention also provides a control method of the fatigue testing machine for the industrial and mining vehicle parts and materials, which comprises the following steps:
acquiring input parameters, determining the control mode to be axial force control or axial strain control according to the input parameters, and controlling the linear motion mechanism to act;
when the control mode is axial force control, acquiring first axial force data and second axial force data acquired by the dynamic load sensor, wherein t 12 －t 11 ＝△t 1 ，0＜△t 1 ＜T 1 ，t 12 Is the acquisition time of the second axial force data, t 11 Is the acquisition time, Δ t, of the first axial force data 1 Is the difference in acquisition time, T, of the second axial force data and the first axial force data 1 The sampling period of the dynamic load sensor is set for the human-computer interaction and control module;
if the first axial force data and the second axial force data reach the first preset value, completing one fatigue test, and repeating the fatigue test until the fatigue test times are reached; if the first axial force data and the second axial force data do not reach the first preset value, acquiring the first axial force data and the second axial force data of the next sampling period until the first axial force data and the second axial force data reach the first preset value;
when the control mode is axial strain control, acquiring a first strain displacement and a second strain displacement acquired by the micro strain sensor, wherein t 22 －t 21 ＝△t 2 ，0＜△t 2 ＜T 2 ，t 22 Acquisition time, t, for the second strain displacement 21 The acquisition time, Δ t, for the first strain displacement 2 The difference in acquisition time, T, between the second strain displacement and the first strain displacement 2 The sampling period of the micro-strain sensor is set for the man-machine interaction and control module;
if the first strain displacement and the second strain displacement both reach a second preset value, finishing a fatigue test, and repeating the fatigue test until the fatigue test times are reached; and if the first strain displacement and the second strain displacement do not reach the second preset value, acquiring the first strain displacement and the second strain displacement of the next sampling period until the first strain displacement and the second strain displacement reach the second preset value.
Further, before controlling the linear motion mechanism to act, the control method further comprises a locking judgment step, and the specific implementation process is as follows:
acquiring a first pressure signal and a second pressure signal acquired by a first pressure sensor, a second pressure sensor and a third pressure sensor, wherein t 32 －t 31 ＝△t 3 ，0＜△t 3 ＜T 3 ，t 32 Is the acquisition time, t, of the second pressure signal 31 Is the acquisition time, Δ t, of the first pressure signal 3 Is the difference in acquisition time, T, of the second pressure signal and the first pressure signal 3 The sampling period of the pressure sensor is set for the human-computer interaction and control module;
if the first pressure signal and the second pressure signal acquired by the first pressure sensor both exceed a first preset pressure value, the base frame locks the upright post; otherwise, an alarm is given out, and the hydraulic locking mechanism is controlled to be locked;
if the first pressure signal and the second pressure signal acquired by the second pressure sensor and the third pressure sensor both exceed a second preset pressure value, the sample clamp clamps the sample; otherwise, an alarm is given, and the sample clamp is controlled to clamp the sample.
Further, before controlling the linear motion mechanism to act, the control method further comprises a base frame limiting and judging step, and the specific implementation process is as follows:
acquiring a first trigger signal and a second trigger signal of a travel switch, wherein t 42 －t 41 ＝△t 4 ，△t 4 ＞0，t 42 Is the time of the second trigger signal, t 41 Is the time of issuance of the first trigger signal,. DELTA.t 4 The sending time difference of the second trigger signal and the first trigger signal is obtained;
if the first trigger signal and the second trigger signal are received, prompting the pedestal to exceed an upper limit or an upper limit; otherwise, the base frame does not exceed the limit.
Further, in the process of controlling the action of the linear motion mechanism, the control method also comprises a step of judging the stroke range of the linear motion mechanism, and the specific implementation process is as follows:
acquiring a first displacement signal and a second displacement signal acquired by a displacement sensor, wherein t 52 －t 51 ＝△t 5 ，0＜△t 5 ＜T 5 ，t 52 Is the acquisition time, t, of the second displacement signal 51 For the acquisition time of the first displacement signal,. DELTA.t 5 Is the difference in acquisition time, T, of the second displacement signal and the first displacement signal 5 The sampling period of the displacement sensor is set for the human-computer interaction and control module;
and if the first displacement signal and the second displacement signal both exceed the effective travel range, giving an alarm to prompt that the linear motion mechanism exceeds the limit.
Advantageous effects
Compared with the prior art, the invention has the advantages that:
the invention provides a fatigue testing machine for parts and materials of industrial and mining vehicles and a control method thereof.A test sample is judged whether to complete a single fatigue test or not according to the pull pressure output by a linear motion mechanism acquired by a dynamic load sensor in an axial force control mode; under an axial strain control mode, judging whether the sample completes a single fatigue test according to the strain displacement of the sample collected by the micro-strain sensor; a time delay complex judgment mode is adopted when the single judgment is carried out, namely the time delay delta t is delayed under the condition that the signals acquired for the first time meet the condition i The acquired signals also need to meet the conditions, so that the problem that the testing machine or the sample is damaged due to judgment errors caused by signal interference is avoided, the misoperation of the testing machine is avoided, and the judgment and action accuracy is improved; the micro-strain sensor is arranged on the sample, and can directly detect the micro-strain displacement of the sample, so that the strain detection precision of the sample is greatly improved;
before the fatigue test or in the test process, the locking judgment, the base frame limiting judgment, the effective travel range judgment and the like are also carried out, so that the damage of the testing machine or a sample caused by the setting problem is avoided, and the reliability, the stability and the safety of the testing machine are improved.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only one embodiment of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural view of a fatigue testing machine in embodiment 1 of the present invention;
FIG. 2 is a control schematic diagram of a fatigue testing machine in embodiment 1 of the present invention;
FIG. 3 is a side view of a hydraulic lock mechanism in embodiment 1 of the invention;
FIG. 4 is a plan view of a hydraulic lock mechanism in embodiment 1 of the invention;
fig. 5 is a schematic view of a mechanical limit + electrical limit structure in embodiment 1 of the present invention;
FIG. 6 is a control flow chart of a fatigue testing machine according to embodiment 2 or 3 of the present invention;
FIG. 7 is a flowchart of a specimen holder clamping judgment in embodiment 2 or 3 of the present invention;
fig. 8 is a flowchart of determining the pedestal overrun limit in embodiment 2 or 3 of the present invention;
fig. 9 is a flowchart for judging the limit of movement of the piston rod in the linear actuator according to embodiment 2 or 3 of the present invention;
FIG. 10 is a flowchart of the effective range judgment of the axial force in embodiment 2 of the present invention;
fig. 11 is a flowchart of determining the effective range of strain displacement in embodiment 3 of the present invention.
The device comprises a linear actuator 1, a linear actuator 11, a piston rod of the linear actuator, a column 2, a travel switch 21, a lower limit ring 22, an upper limit ring 23, a lifting mechanism 3, a pedestal 4, a pedestal body 41, a mounting block 42, a hydraulic cylinder of a hydraulic locking mechanism 43, a piston rod of a hydraulic locking mechanism 44, a first chuck 5, a second chuck 6, a test sample 7, an extensometer 8, a base 9 and a dynamic load sensor 10.
Detailed Description
The technical solutions in the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical solution of the present application will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Example 1
As shown in fig. 1, the fatigue testing machine for the fatigue test of the industrial and mining vehicle parts or materials provided by the embodiment of the invention comprises a base 9, an upright post 2, a pedestal 4, a lifting mechanism 3, a linear motion mechanism, a sample clamp, a dynamic load sensor 10, a micro-strain sensor and a human-computer interaction and control module; the base 9 plays a supporting role for the whole testing machine, the upright post 2 is arranged on the base 9, the base frame 4 is sleeved on the upright post 2, and the upright post 2 is locked through a hydraulic locking mechanism; a lifting mechanism 3 is arranged between the pedestal 4 and the base 9; a linear motion mechanism is arranged on the base frame 4, and the output end of the linear motion mechanism penetrates through the base frame 4 and faces the base 9; the sample clamp comprises a first clamp 5 and a second clamp 6, the first clamp 5 is arranged at the output end of the linear motion mechanism, the second clamp 6 is arranged on a base 9, and the first clamp 5 is aligned with the second clamp 6 so as to enable a sample 7 clamped by the first clamp 5 and the second clamp 6 to be in an axial direction; one end of the dynamic load sensor 10 is connected with the linear motion mechanism, and the other end is connected with the first chuck 5; the micro-strain sensor is arranged on the sample 7; the human-computer interaction and control module is respectively and electrically connected with the lifting mechanism 3, the linear motion mechanism, the sample clamp, the dynamic load sensor 10 and the micro-strain sensor.
In a specific embodiment of the invention, the lifting mechanism 3 is a lifting hydraulic cylinder, test parameters such as the length of the sample 7, the effective range of the axial force or the effective range of the axial strain are set on an interface of the human-computer interaction and control module, the lifting hydraulic cylinder is controlled to move up and down according to the test parameters, the base frame 4 moves up and down along the upright post 2, the positions of the base frame 4 and the linear motion mechanism are adjusted, and further the distance between the first chuck 5 and the second chuck 6 is adjusted, so that the base frame 4 is ensured not to exceed the limit in the whole test process, and the requirements of the length of the sample 7, the effective range of the axial force and the effective range of the axial strain can be met. Before the test, the position of the base frame 4 is adjusted through the lifting mechanism 3, the base frame 4 is kept still in the test process, and only the linear motion mechanism acts.
In an embodiment of the present invention, the linear motion mechanism is an electro-hydraulic servo linear actuator 1, and the structure and the operation principle of the electro-hydraulic servo linear actuator 1 may refer to "the operation principle and the control of the electro-hydraulic servo linear actuator 1 system" proposed by Cao Wenqing, etc. The electro-hydraulic servo linear actuator 1 comprises a cylinder body, a piston rod 11 and an electro-hydraulic servo valve, and the man-machine interaction and control module controls the flow and the frequency of hydraulic oil in the cylinder body through the electro-hydraulic servo valve, so that the piston rod 11 is controlled to do linear motion, and axial force or axial strain is controlled. The first chuck 5 is installed at the output end of the piston rod 11, and when the piston rod 11 makes a linear motion, the first chuck 5 makes a linear motion, so as to perform a pulling and pressing action on the sample 7.
In one embodiment of the present invention, the first chuck 5 and the second chuck 6 are both hydraulic chucks, and the structure thereof can refer to a hydraulic forced chuck (with an authorization publication number of CN 201034882Y). The test sample 7 is clamped by adopting hydraulic pressure as power, so that the test sample 7 is ensured not to loosen under the condition of symmetrical loads in two directions of tension and compression, and the completion of a symmetrical fatigue test is ensured.
In the linear actuator 1, the output end of a piston rod 11 is rigidly connected with one end of a dynamic load sensor 10, the other end of the dynamic load sensor 10 is connected with a first chuck 5, and in the process of linear motion of the piston rod 11, the dynamic load sensor 10 collects the pulling pressure (i.e. axial force data) output by the piston rod 11, and the pulling pressure or the axial force is used as a feedback signal for axial force control. When the pulling pressure acquired by the dynamic load sensor 10 reaches a first preset value, the single fatigue test is completed in an axial force control mode; when the pulling pressure acquired by the dynamic load sensor 10 reaches a first early warning value, the testing machine is indicated to have a fault, and a fault alarm is sent out, wherein the first preset value is smaller than the first early warning value, so that the damage caused by excessive actions of the testing machine or the sample 7 is avoided.
In one embodiment of the present invention, the micro strain sensor is a extensometer 8, a calibration line is marked on the sample 7, the calibration line indicates which part of the sample 7 needs to be tested for fatigue strength, the extensometer 8 is mounted on the calibration line of the sample 7, when the first chuck 5 moves linearly, the sample 7 is stretched or compressed, the extensometer 8 can be used for detecting the micro strain displacement at the calibration line of the sample 7, and the micro strain displacement is used as a feedback signal for axial strain control. When the strain displacement acquired by the extensometer 8 reaches a second preset value, the single fatigue test is completed in an axial strain control mode; when the strain displacement acquired by the extensometer 8 reaches a second early warning value, the failure of the testing machine is indicated, and a failure alarm is given out, wherein the second preset value is less than the second early warning value, so that the damage caused by excessive motion of the testing machine or the sample 7 is avoided. For the displacement sensor arranged on the piston rod 11 of the linear actuator 1 to collect the strain displacement of the sample 7, the extensometer 8 is directly designed on the sample 7, so that the micro strain displacement of the sample 7 can be collected, and the collection accuracy of the strain displacement is greatly improved.
The human-computer interaction and control module comprises a human-computer interaction interface and an electric control part, and various test parameters such as a control mode (axial force control or axial strain control), the movement direction and the movement speed of the linear actuator 1, various preset values and early warning values and the like can be set on the human-computer interaction interface. The electric control part controls the actuators (such as the lifting mechanism 3, the linear motion mechanism, the sample holder, etc.) according to the set parameters and the feedback signals, as shown in fig. 2. Specifically, when a fatigue test is carried out, the human-computer interaction and control module determines whether axial force control or axial strain control is carried out according to an input control mode, and controls a piston rod 11 in the linear actuator 1 to do linear motion according to the input motion direction and motion speed of the linear actuator 1; when the axial force is controlled, acquiring axial force data fed back by the dynamic load sensor 10, judging whether a single fatigue test is finished (when a first preset value is reached) according to the fed-back axial force data, when the single fatigue test is finished, controlling the cylinder body in the linear actuator 1 to release pressure, and performing the next fatigue test again until the fatigue test times are reached; and when the single fatigue test is finished, controlling the cylinder body in the linear actuator 1 to release pressure, and performing the next fatigue test again until the fatigue test times are reached. Before the fatigue test, the lifting mechanism 3 is also controlled to adjust the positions of the base frame 4 and the linear actuator 1 on the upright post 2, and adjust the distance between the first chuck 5 and the second chuck 6 to adapt to samples 7 with different lengths, so that the base frame 4 and the linear actuator 1 are ensured to be in proper positions.
In one embodiment of the present invention, as shown in fig. 3 and 4, the hydraulic lock mechanism includes a hydraulic cylinder 43 and a piston rod 44; the pedestal 4 comprises a pedestal body 41 and an installation block 42, a semi-open cylindrical hole is formed in the pedestal body 41 and the installation block 44, the semi-open cylindrical hole is sleeved on the upright column 2, and the pedestal body 41 and the installation block 42 are locked by the hydraulic locking mechanism, so that the upright column 2 is locked by the pedestal 4.
In an embodiment of the present invention, a first pressure sensor is disposed on the hydraulic cylinder 43 of the hydraulic locking mechanism, and the inlet/outlet pressure of the hydraulic cylinder 43 of the hydraulic locking mechanism is detected to determine whether the base frame 4 locks the upright post 2, and when the upright post 2 is not locked, the flow rate of hydraulic oil in the hydraulic cylinder 43 of the hydraulic locking mechanism is controlled to control the piston rod 44 of the hydraulic locking mechanism to operate, so that the base frame 4 locks the upright post 2. The base frame 4 locks the upright column 2, so that the stability of the positions of the linear actuator 1 and the base frame 4 in the fatigue test process is ensured, and only the piston rod of the linear actuator 1 moves linearly.
In an embodiment of the present invention, a second pressure sensor is disposed on the first chuck 5, a third pressure sensor is disposed on the second chuck 6, and it is determined whether the first chuck 5 clamps one end of the sample 7 by detecting the inlet/outlet pressure of the hydraulic cylinder of the first chuck 5, and it is determined whether the second chuck 6 clamps the other end of the sample 7 by detecting the inlet/outlet pressure of the hydraulic cylinder of the second chuck 6, so as to determine whether the sample 7 is clamped by the sample 7 clamp, and control the sample 7 clamp to clamp the sample 7 when the sample 7 is not clamped, thereby preventing the sample 7 from falling off during the sample 7 process.
In an embodiment of the present invention, as shown in fig. 5, an upper limit ring 23 and a lower limit ring 22 are disposed on the column 2, a travel switch 21 electrically connected to the human-computer interaction and control module is disposed on each of the upper limit ring 23 and the lower limit ring 22, and the human-computer interaction and control module is further configured to determine whether the base frame 4 exceeds the limit according to a trigger signal of the travel switch 21. The pedestal 4 is located between the upper limit ring 23 and the lower limit ring 22, the position of the pedestal 4 is limited by the upper limit ring 22 and the lower limit ring 22 and the travel switch 21, the mechanical limit and electric limit dual limit functions are achieved, and the safety of the testing machine is ensured.
In one embodiment of the present invention, a displacement sensor electrically connected to the human-computer interaction and control module is disposed on the piston rod 11 of the linear actuator 1; the human-computer interaction and control module is also used for judging whether the linear motion mechanism works in the effective stroke range according to the displacement data collected by the displacement sensor, and when the effective stroke range of the piston rod 11 of the linear actuator 1 is exceeded, the human-computer interaction and control module gives an alarm, so that the piston rod 11 of the linear actuator 1 is prevented from moving beyond the measuring range, and the safety and the reliability of the testing machine are ensured.
Example 2
As shown in fig. 6, an embodiment of the present invention further provides a method for controlling a fatigue testing machine according to embodiment 1, including the following steps:
1. and (4) locking judgment: before the linear actuator acts or a fatigue test is carried out, whether the upright post is locked by the base frame or not and whether the sample clamp clamps the sample or not are judged.
(1.1) the concrete implementation process of judging whether the base frame locks the upright column is as follows:
acquiring a first pressure signal and a second pressure signal acquired by a first pressure sensor, wherein t 32 －t 31 ＝△t 3 ，0＜△t 3 ＜T 3 ，t 32 Is the acquisition time, t, of the second pressure signal 31 Is the acquisition time, Δ t, of the first pressure signal 3 Is the difference in acquisition time, T, of the second pressure signal and the first pressure signal 3 Is the sampling period of the pressure sensors (first pressure sensor, second pressure sensor and third pressure sensor);
if the first pressure signal and the second pressure signal acquired by the first pressure sensor both exceed a first preset pressure value, the base frame locks the upright post; otherwise, an alarm is given out, and the hydraulic locking mechanism is controlled to lock.
After the first pressure sensor collects the first pressure signal, the time delay delta t is carried out 3 And then, acquiring a second pressure signal, and indicating the base frame locking upright column when the first pressure signal and the second pressure signal both exceed a first preset pressure value. In field tests with complex electromagnetic environment, interference signals exist, andthe time delay complex judgment mode avoids the problem that the interference signal influences the accuracy of the acquired signal to cause misjudgment. Only when the judgment results based on the two collected signals (the first pressure signal and the second pressure signal) are consistent, the judgment result is considered to be effective, the judgment accuracy is improved, and the misoperation is avoided. Thus, Δ t 3 It can be set according to the interfering signal duration, typically in the order of us or ms.
The base frame locks the upright column, so that the linear actuator is ensured to move only by the piston rod in the linear actuator in the linear motion process, the linear actuator does not move integrally, and the accuracy of the pulling and pressing actions on the sample is ensured.
(1.2) as shown in fig. 7, the specific implementation process of judging whether the sample clamp clamps the sample is as follows:
acquiring a first pressure signal and a second pressure signal acquired by a second pressure sensor and a third pressure sensor;
if the first pressure signal and the second pressure signal acquired by the second pressure sensor and the third pressure sensor exceed a second preset pressure value, the sample clamp clamps the sample; otherwise, an alarm is given, and the sample clamp is controlled to clamp the sample.
The problem of misjudgment caused by the fact that the accuracy of the first pressure signal is influenced by the interference signal is solved by adopting a time delay complex judgment mode, the judgment accuracy is improved, and the misoperation is avoided. The sample clamp clamps the sample, so that the sample is prevented from falling off in the whole fatigue test process, and the sample is prevented from being damaged or even threatening personal safety when the sample is not clamped.
2. And (3) limiting and judging the base frame: before the linear actuator acts or before a fatigue test, the human-computer interaction and control module controls the lifting mechanism to act up and down, and the position of the base frame is adjusted, so that the position of the linear actuator is adjusted, the distance between the first chuck and the second chuck can adapt to the length of a sample, and the piston rod of the linear actuator can normally move linearly in the effective stroke range of the piston rod. In order to avoid the pedestal position adjusting process, the pedestal is over-limited, an upper limit ring and a lower limit ring (mechanical limit) are arranged on the upright column, and travel switches (electrical limit) are arranged on the upper limit ring and the lower limit ring. The pedestal is judged to exceed the limit according to the trigger signal of the travel switch, as shown in fig. 8, the concrete implementation process is as follows:
acquiring a first trigger signal and a second trigger signal of a travel switch, wherein t 42 －t 41 ＝△t 4 ，△t 4 ＞0，t 42 Is the time of the second trigger signal, t 41 Is the time of issuance of the first trigger signal,. DELTA.t 4 The sending time difference of the second trigger signal and the first trigger signal is obtained;
if the first trigger signal and the second trigger signal are received, prompting the pedestal to exceed an upper limit or an upper limit; otherwise, the base frame does not exceed the limit. In the present embodiment, Δ t 4 It can be set according to the interfering signal duration, typically in the order of us or ms.
At a delay of Δ t 4 And then, the trigger signal of the travel switch is acquired again, and the judgment result is considered to be effective only when the judgment results based on the two acquired signals are consistent, so that the judgment accuracy is improved, and the problem of misjudgment caused by the fact that the accuracy of the acquired signals is influenced by interference signals is solved by adopting a time-delay repeated judgment mode. The pedestal exceeds the limit, and the pedestal working position is judged to avoid exceeding the limit to cause the damage of the testing machine.
The steps 1 and 2 are not in sequence.
3. Fatigue test under axial force control: and determining a control mode and controlling the linear actuator to act.
And (3) when the conditions of the steps (1) and (2) are met, namely the base frame locking upright column, the sample clamp the sample and the base frame do not exceed the limit, setting parameters on a human-computer interaction interface, determining a control mode and the motion parameters of the linear actuator, and controlling the piston rod in the linear actuator to do linear motion according to the motion parameters of the linear actuator. In this embodiment, the control method is axial force control.
4. Acquiring and judging axial force data:
in the motion process of the linear actuator, acquiring first axial force data and second axial force data acquired by the dynamic load sensorAccording to, wherein t 12 －t 11 ＝△t 1 ，0＜△t 1 ＜T 1 ，t 12 Is the acquisition time of the second axial force data, t 11 Is the acquisition time, Δ t, of the first axial force data 1 Is the difference in acquisition time, T, of the second axial force data and the first axial force data 1 Is the sampling period of the dynamic load sensor;
if the first axial force data and the second axial force data reach a first preset value (namely the required stress intensity is reached), finishing one fatigue test, simultaneously releasing pressure of a hydraulic cylinder of the linear actuator, and repeating the steps 3 and 4 to carry out the next fatigue test until the fatigue test times are reached;
and if the first axial force data and the second axial force data do not reach the first preset value (namely the required stress intensity is not reached), acquiring the first axial force data and the second axial force data of the next sampling period until the first axial force data and the second axial force data reach the first preset value, and finishing the single fatigue test.
In the present embodiment, Δ t 1 It can be set according to the interfering signal duration, typically in the order of us or ms.
5. Limit determination during linear actuator motion
The limit judgment and the fatigue test are carried out synchronously, the limit judgment comprises the motion limit judgment and the axial force effective range judgment of a piston rod in the linear actuator, the limit judgment avoids the problem that the test machine is damaged due to the fact that the axial force cannot be detected by the dynamic load sensor after the sample is broken and continues to be stretched when the axial force is used as input control, and meanwhile the condition that the axial force exceeds the range of the dynamic load sensor is avoided.
As shown in fig. 9, the specific implementation process of determining the movement limit of the piston rod in the linear actuator is as follows:
acquiring a first displacement signal and a second displacement signal acquired by a displacement sensor, wherein t 52 －t 51 ＝△t 5 ，0＜△t 5 ＜T 5 ，t 52 Is the acquisition time, t, of the second displacement signal 51 Is the first bitTime of acquisition of the shifted signal,. DELTA.t 5 Is the difference in acquisition time, T, of the second displacement signal and the first displacement signal 5 Is the sampling period of the displacement sensor;
if the first displacement signal and the second displacement signal both exceed the effective stroke range (namely the effective stroke range of the piston rod movement), an alarm is given out to prompt that the piston rod movement in the linear actuator exceeds the effective stroke range, and meanwhile, the hydraulic cylinder of the linear actuator is controlled to release pressure, so that the testing machine is prevented from being damaged.
In the present embodiment, Δ t 5 It can be set according to the interfering signal duration, typically in the order of us or ms.
As shown in fig. 10, the specific implementation process of the axial force effective range determination is as follows:
acquiring first axial force data and second axial force data acquired by a dynamic load sensor;
if the first axial force data and the second axial force data are not in the set effective range (namely the range of the dynamic load sensor), the axial force exceeds the range, the hydraulic cylinder of the linear actuator is controlled to release pressure, and the testing machine is prevented from being damaged.
Example 3
As shown in fig. 6, an embodiment of the present invention further provides a method for controlling a fatigue testing machine according to embodiment 1, including the following steps:
1. and (4) locking judgment: before the linear actuator acts or before a fatigue test, whether the base frame locks the upright column or not and whether the sample clamp clamps the sample or not are judged.
(1.1) the concrete implementation process of judging whether the base frame locks the upright column is as follows:
acquiring a first pressure signal and a second pressure signal acquired by a first pressure sensor, wherein t 32 －t 31 ＝△t 3 ，0＜△t 3 ＜T 3 ，t 32 Is the acquisition time, t, of the second pressure signal 31 Is the acquisition time, Δ t, of the first pressure signal 3 Is the difference in acquisition time, T, of the second pressure signal and the first pressure signal 3 Is a pressure sensor (first pressure sensor, second pressure)Force sensor and third pressure sensor);
if the first pressure signal and the second pressure signal acquired by the first pressure sensor both exceed a first preset pressure value, the base frame locks the upright post; otherwise, an alarm is given out, and the hydraulic locking mechanism is controlled to lock.
After the first pressure sensor collects the first pressure signal, the time delay delta t is carried out 3 And then, collecting a second pressure signal, and indicating the base frame locking upright column when the first pressure signal and the second pressure signal exceed a first preset pressure value. In a field test with a complex electromagnetic environment, an interference signal exists, and the problem of misjudgment caused by the fact that the interference signal influences the accuracy of a collected signal is solved by adopting a time-delay complex judgment mode. Only when the judgment results based on the two collected signals (the first pressure signal and the second pressure signal) are consistent, the judgment result is considered to be effective, the judgment accuracy is improved, and the misoperation is avoided. Thus, Δ t 3 It can be set according to the interfering signal duration, typically in the order of us or ms.
The base frame locks the upright column, so that the linear actuator is ensured to move only by the piston rod in the linear actuator in the linear motion process, the linear actuator does not move integrally, and the accuracy of the pulling and pressing actions on the sample is ensured.
(1.2) as shown in fig. 7, the specific implementation process of judging whether the sample clamp clamps the sample is as follows:
acquiring a first pressure signal and a second pressure signal acquired by a second pressure sensor and a third pressure sensor;
if the first pressure signal and the second pressure signal acquired by the second pressure sensor and the third pressure sensor both exceed a second preset pressure value, the sample clamp clamps the sample; otherwise, an alarm is given, and the sample clamp is controlled to clamp the sample.
The problem of misjudgment caused by the fact that the accuracy of the first pressure signal is influenced by the interference signal is solved by adopting a time delay complex judgment mode, the judgment accuracy is improved, and the misoperation is avoided. The sample clamp clamps the sample, so that the sample is prevented from falling off in the whole fatigue test process, and the sample is prevented from being damaged or even threatening personal safety when the sample is not clamped.
2. And (3) limiting and judging the base frame: before the linear actuator acts or before a fatigue test, the human-computer interaction and control module controls the lifting mechanism to act up and down, and the position of the base frame is adjusted, so that the position of the linear actuator is adjusted, the distance between the first chuck and the second chuck can adapt to the length of a sample, and the piston rod of the linear actuator can normally move linearly in the effective stroke range of the piston rod. In order to avoid the pedestal position adjusting process, the pedestal is over-limited, an upper limit ring and a lower limit ring (mechanical limit) are arranged on the upright column, and travel switches (electrical limit) are arranged on the upper limit ring and the lower limit ring. The pedestal is judged to exceed the limit according to the trigger signal of the travel switch, as shown in fig. 8, the concrete implementation process is as follows:
acquiring a first trigger signal and a second trigger signal of a travel switch, wherein t 42 －t 41 ＝△t 4 ，△t 4 ＞0，t 42 Is the time of the second trigger signal, t 41 Is the time of issuance of the first trigger signal,. DELTA.t 4 Is the sending time difference of the second trigger signal and the first trigger signal;
if the first trigger signal and the second trigger signal are received, prompting the pedestal to exceed an upper limit or an upper limit; otherwise, the base frame does not exceed the limit. In the present embodiment, Δ t 4 It can be set according to the interfering signal duration, typically in the order of us or ms.
At a delay of Δ t 4 And then, the trigger signal of the travel switch is acquired again, and the judgment result is considered to be effective only when the judgment results based on the two acquired signals are consistent, so that the judgment accuracy is improved, and the problem of misjudgment caused by the fact that the accuracy of the acquired signals is influenced by interference signals is solved by adopting a time-delay repeated judgment mode. The base frame exceeds the limit to judge and avoids the damage of the testing machine caused by the fact that the working position of the base frame exceeds the limit.
The steps 1 and 2 are not in sequence.
3. Fatigue test in axial strain control mode: and determining a control mode and controlling the linear actuator to act.
And (3) when the conditions of the steps (1) and (2) are met, namely the base frame locking upright column, the sample clamp clamps the sample and the base frame does not exceed the limit, setting parameters on a human-computer interaction interface, determining a control mode and the motion parameters of the linear actuator, and controlling the piston rod in the linear actuator to do linear motion according to the motion parameters of the linear actuator. In this embodiment, the control method is axial strain control.
4. Acquiring and judging strain displacement data:
acquiring a first strain displacement and a second strain displacement acquired by an extensometer in the motion process of a linear actuator, wherein t 22 －t 21 ＝△t 2 ，0＜△t 2 ＜T 2 ，t 22 Acquisition time, t, for the second strain displacement 21 Acquisition time, Δ t, for the first strain displacement 2 The difference in acquisition time, T, between the second strain displacement and the first strain displacement 2 Sampling period of the micro strain sensor;
if the first strain displacement and the second strain displacement both reach a second preset value (namely the required strain intensity is reached), finishing one fatigue test, simultaneously relieving the pressure of the hydraulic cylinder of the linear actuator, and repeating the steps 3 and 4 to carry out the next fatigue test until the fatigue test times are reached;
and if the first strain displacement and the second strain displacement do not reach the second preset value (namely the required strain intensity is not reached), acquiring the first strain displacement and the second strain displacement of the next sampling period until the first strain displacement and the second strain displacement reach the second preset value, namely completing the single fatigue test.
In the present embodiment, Δ t 2 It can be set according to the interfering signal duration, typically in the order of us or ms.
5. Limit determination during linear actuator motion
The limit judgment and the fatigue test are carried out synchronously, the limit judgment comprises the motion limit judgment and the effective range judgment of the strain displacement of the piston rod in the linear actuator, the limit judgment avoids the condition that the fatigue test times are misjudged because the strain displacement detected by the extensometer is normal and the fatigue test is continued after the sample is broken, and simultaneously the condition that the fatigue test times are misjudged is avoided and the condition that the measurement range exceeds the extensometer.
As shown in fig. 9, the specific implementation process of determining the movement limit of the piston rod in the linear actuator is as follows:
acquiring a first displacement signal and a second displacement signal acquired by a displacement sensor, wherein t 52 －t 51 ＝△t 5 ，0＜△t 5 ＜T 5 ，t 52 Is the acquisition time, t, of the second displacement signal 51 For the acquisition time of the first displacement signal,. DELTA.t 5 Is the difference in acquisition time, T, of the second displacement signal and the first displacement signal 5 Is the sampling period of the displacement sensor;
if the first displacement signal and the second displacement signal both exceed the effective stroke range (namely the effective stroke range of the piston rod movement), an alarm is given out to prompt that the piston rod movement in the linear actuator exceeds the effective stroke range, and meanwhile, the hydraulic cylinder of the linear actuator is controlled to release pressure, so that the testing machine is prevented from being damaged.
In the present embodiment, Δ t 5 It can be set according to the interfering signal duration, typically in the order of us or ms.
As shown in fig. 11, the specific implementation process of the effective range judgment of the strain displacement is as follows:
acquiring a first strain displacement and a second strain displacement acquired by an extensometer;
if the first strain displacement and the second strain displacement are not in the set effective range (namely the range of the extensometer), the strain displacement exceeds the range, the hydraulic cylinder of the linear actuator is controlled to release pressure, and the tester is prevented from being damaged.
The above disclosure is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or modifications within the technical scope of the present invention, and shall be covered by the scope of the present invention.

Claims (10)

1. The utility model provides a fatigue testing machine for industrial and mining vehicle spare part and material for to the sample that awaits measuring carries out anti fatigue test, its characterized in that, fatigue testing machine includes:
a base;
the upright column is arranged on the base;
the base frame is sleeved on the upright post;
the lifting mechanism is arranged between the base frame and the base, and the base frame moves up and down along the upright post under the action of the lifting mechanism;
the linear motion mechanism is arranged on the base frame, and the output end of the linear motion mechanism penetrates through the base frame and extends towards the base;
the sample clamp comprises a first chuck and a second chuck, the first chuck is arranged at the output end of the linear motion mechanism, the second chuck is arranged on the base, and the first chuck is aligned with the second chuck;
one end of the dynamic load sensor is connected with the linear motion mechanism, and the other end of the dynamic load sensor is connected with the first chuck and is used for detecting the output pulling pressure of the linear motion mechanism;
the micro-strain sensor is arranged on the sample and used for detecting the strain displacement of the sample, and the sample is arranged between the first chuck and the second chuck;
and the human-computer interaction and control module is respectively electrically connected with the lifting mechanism, the linear motion mechanism, the sample clamp, the dynamic load sensor and the micro-strain sensor, is used for controlling the linear motion mechanism to act, and judges whether the fatigue test of the sample is finished according to the data collected by the dynamic load sensor or the micro-strain sensor.
2. The fatigue testing machine for industrial and mining vehicle parts and materials according to claim 1, characterized in that: the base frame is sleeved on the upright column and locked through a hydraulic locking mechanism, and a first pressure sensor electrically connected with the human-computer interaction and control module is arranged on the hydraulic locking mechanism; a second pressure sensor electrically connected with the human-computer interaction and control module is arranged on the first chuck, and a third pressure sensor electrically connected with the human-computer interaction and control module is arranged on the second chuck;
the human-computer interaction and control module is also used for judging whether the base frame locks the stand column or not according to the pressure signal acquired by the first pressure sensor; and the pressure sensor is used for judging whether the sample clamp clamps the sample according to the pressure signals collected by the second pressure sensor and the third pressure sensor.
3. The fatigue testing machine for industrial and mining vehicle parts and materials according to claim 1, characterized in that: an upper limit ring and a lower limit ring are arranged on the upright post, and travel switches electrically connected with the human-computer interaction and control module are arranged on the upper limit ring and the lower limit ring;
the man-machine interaction and control module is also used for judging whether the base frame exceeds the limit position according to the trigger signal of the travel switch.
4. The fatigue testing machine for industrial and mining vehicle parts and materials according to claim 1, characterized in that: a displacement sensor electrically connected with the human-computer interaction and control module is arranged in the linear motion mechanism;
the human-computer interaction and control module is also used for judging whether the linear motion mechanism works in an effective travel range according to the displacement data acquired by the displacement sensor.
5. The fatigue testing machine for industrial and mining vehicle parts and materials according to any one of claims 1 to 4, characterized in that: the linear motion mechanism is a linear actuator.
6. The fatigue testing machine for industrial and mining vehicle parts and materials according to any one of claims 1 to 4, characterized in that: the micro strain sensor is an extensometer.
7. A control method of a fatigue testing machine for industrial and mining vehicle parts and materials according to any one of claims 1 to 6, characterized by comprising the steps of:
acquiring input parameters, determining a control mode to be axial force control or axial strain control according to the input parameters, and controlling the linear motion mechanism to act;
when the control mode is axial force control, acquiring first axial force data and second axial force data acquired by the dynamic load sensor, wherein t 12 －t 11 ＝△t 1 ，0＜△t 1 ＜T 1 ，t 12 Is the acquisition time of the second axial force data, t 11 Is the acquisition time, Δ t, of the first axial force data 1 Is the difference in acquisition time, T, of the second axial force data and the first axial force data 1 The sampling period of the dynamic load sensor is set for the human-computer interaction and control module;
if the first axial force data and the second axial force data reach the first preset value, completing one fatigue test, and repeating the fatigue test until the fatigue test times are reached; if the first axial force data and the second axial force data do not reach the first preset value, acquiring the first axial force data and the second axial force data of the next sampling period until the first axial force data and the second axial force data reach the first preset value;
when the control mode is axial strain control, acquiring a first strain displacement and a second strain displacement acquired by the micro strain sensor, wherein t 22 －t 21 ＝△t 2 ，0＜△t 2 ＜T 2 ，t 22 Acquisition time, t, for the second strain displacement 21 The acquisition time, Δ t, for the first strain displacement 2 The difference in acquisition time, T, between the second strain displacement and the first strain displacement 2 The sampling period of the micro-strain sensor is set for the man-machine interaction and control module;
if the first strain displacement and the second strain displacement both reach a second preset value, finishing a fatigue test, and repeating the fatigue test until the fatigue test times are reached; and if the first strain displacement and the second strain displacement do not reach the second preset value, acquiring the first strain displacement and the second strain displacement of the next sampling period until the first strain displacement and the second strain displacement reach the second preset value.
8. The control method for the fatigue testing machine for the industrial and mining vehicle parts and materials according to claim 7, wherein before controlling the action of the linear motion mechanism, the control method further comprises a locking judgment step, and the specific implementation process is as follows:
acquiring a first pressure signal and a second pressure signal acquired by a first pressure sensor, a second pressure sensor and a third pressure sensor, wherein t 32 －t 31 ＝△t 3 ，0＜△t 3 ＜T 3 ，t 32 Is the acquisition time, t, of the second pressure signal 31 Is the acquisition time, Δ t, of the first pressure signal 3 Is the difference in acquisition time, T, of the second pressure signal and the first pressure signal 3 The sampling period of the pressure sensor is set for the human-computer interaction and control module;
if the first pressure signal and the second pressure signal acquired by the first pressure sensor both exceed a first preset pressure value, the base frame locks the upright post; otherwise, an alarm is given out, and the hydraulic locking mechanism is controlled to be locked;
if the first pressure signal and the second pressure signal acquired by the second pressure sensor and the third pressure sensor both exceed a second preset pressure value, the sample clamp clamps the sample; otherwise, an alarm is given, and the sample clamp is controlled to clamp the sample.
9. The control method for the fatigue testing machine for the industrial and mining vehicle parts and materials according to claim 7 or 8, wherein before controlling the linear motion mechanism to act, the control method further comprises a base frame limit judgment step, and the specific implementation process is as follows:
acquiring a first trigger signal and a second trigger signal of a travel switch, wherein t 42 －t 41 ＝△t 4 ，△t 4 ＞0，t 42 Is the time of the second trigger signal, t 41 Is the time of issuance of the first trigger signal,. DELTA.t 4 Is as followsThe sending time difference of the two trigger signals and the first trigger signal;
if the first trigger signal and the second trigger signal are received, prompting the pedestal to exceed an upper limit or an upper limit; otherwise, the base frame does not exceed the limit.
10. The control method for the fatigue testing machine for the industrial and mining vehicle parts and materials according to claim 7 or 8, wherein in the process of controlling the action of the linear motion mechanism, the control method further comprises a step of judging the stroke range of the linear motion mechanism, and the specific implementation process is as follows:
acquiring a first displacement signal and a second displacement signal acquired by a displacement sensor, wherein t 52 －t 51 ＝△t 5 ，0＜△t 5 ＜T 5 ，t 52 Is the acquisition time, t, of the second displacement signal 51 For the acquisition time of the first displacement signal,. DELTA.t 5 Is the difference in acquisition time, T, of the second displacement signal and the first displacement signal 5 A sampling period of a displacement sensor is set for the human-computer interaction and control module;
and if the first displacement signal and the second displacement signal both exceed the effective travel range, giving an alarm to prompt that the linear motion mechanism exceeds the limit.
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Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10185788A (en) * 1996-12-27 1998-07-14 Shimadzu Corp Test device
KR19990002787A (en) * 1997-06-23 1999-01-15 구자홍 Tensile-Compression Fatigue Tester using Piazo Actuator
CN202024881U (en) * 2011-01-17 2011-11-02 柳州五菱汽车有限责任公司 Multifunctional test bed
CN103512804A (en) * 2013-10-18 2014-01-15 徐州工程学院 Automatic control method for small-scale tensile testing machine
CN104215500A (en) * 2014-08-22 2014-12-17 奇瑞汽车股份有限公司 Automatic counting device for fatigue test and automatic counting method
JP2015210094A (en) * 2014-04-24 2015-11-24 株式会社島津製作所 Ultrasonic fatigue test machine and ultrasonic fatigue test method
CN107764672A (en) * 2016-08-21 2018-03-06 胡松华 A kind of double adhesive tape fatigue testing machine automatic control system
CN109883833A (en) * 2019-03-12 2019-06-14 吉林大学 Fatigue of materials Mechanics Performance Testing apparatus and method under stretching-bending combined load
CN109975134A (en) * 2019-04-02 2019-07-05 北京理工大学 A kind of torsional fatigue damage check test platform
CN110186957A (en) * 2019-05-30 2019-08-30 哈尔滨工业大学 A kind of synchronizing information acquisition processing system and method
CN111879488A (en) * 2020-09-02 2020-11-03 江苏百若试验仪器有限公司 Testing machine capable of performing axial fatigue and transverse vibration of fastener and application method thereof
CN112666018A (en) * 2020-11-03 2021-04-16 四川大学 Ultrasonic frequency mechanical loading fatigue test system for dissimilar metal welded joint

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10185788A (en) * 1996-12-27 1998-07-14 Shimadzu Corp Test device
KR19990002787A (en) * 1997-06-23 1999-01-15 구자홍 Tensile-Compression Fatigue Tester using Piazo Actuator
CN202024881U (en) * 2011-01-17 2011-11-02 柳州五菱汽车有限责任公司 Multifunctional test bed
CN103512804A (en) * 2013-10-18 2014-01-15 徐州工程学院 Automatic control method for small-scale tensile testing machine
JP2015210094A (en) * 2014-04-24 2015-11-24 株式会社島津製作所 Ultrasonic fatigue test machine and ultrasonic fatigue test method
CN104215500A (en) * 2014-08-22 2014-12-17 奇瑞汽车股份有限公司 Automatic counting device for fatigue test and automatic counting method
CN107764672A (en) * 2016-08-21 2018-03-06 胡松华 A kind of double adhesive tape fatigue testing machine automatic control system
CN109883833A (en) * 2019-03-12 2019-06-14 吉林大学 Fatigue of materials Mechanics Performance Testing apparatus and method under stretching-bending combined load
CN109975134A (en) * 2019-04-02 2019-07-05 北京理工大学 A kind of torsional fatigue damage check test platform
CN110186957A (en) * 2019-05-30 2019-08-30 哈尔滨工业大学 A kind of synchronizing information acquisition processing system and method
CN111879488A (en) * 2020-09-02 2020-11-03 江苏百若试验仪器有限公司 Testing machine capable of performing axial fatigue and transverse vibration of fastener and application method thereof
CN112666018A (en) * 2020-11-03 2021-04-16 四川大学 Ultrasonic frequency mechanical loading fatigue test system for dissimilar metal welded joint

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
中华人民共和国国家质量监督检验检疫总局: ""金属材料疲劳试验轴向应变控制方法"", 《GB/T26077-2010金属材料疲劳试验轴向应变控制方法》, 10 January 2011 (2011-01-10), pages 1 - 28 *
朱文良 等: ""基于虚拟仪器的车辆零部件应力测试及疲劳强度分析系统"", 《测控技术》, vol. 31, no. 7, 31 December 2012 (2012-12-31), pages 92 - 95 *

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