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Method and system for evaluating service life of excavator working device

A working device and life evaluation technology, applied in computer-aided design, special data processing applications, instruments, etc., can solve problems such as inability to effectively evaluate the service life of excavator arms

Pending Publication Date: 2021-01-05
SANY HEAVY MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the above evaluation method cannot effectively evaluate the service life of the excavator arm

Method used

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  • Method and system for evaluating service life of excavator working device
  • Method and system for evaluating service life of excavator working device
  • Method and system for evaluating service life of excavator working device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] figure 1 It is a flow chart of the life assessment method for the working device of the excavator provided in Embodiment 1 of the present invention.

[0061] refer to figure 1 , the method includes the following steps:

[0062] Step S101, determining the faulty part of the working device of the excavator and the service life corresponding to the faulty part;

[0063] Specifically, the working equipment of the excavator includes but is not limited to the boom. The fault location of the boom is usually located at the position of the weld. The fault location of the boom includes at least: The butt welds between the fork bent plate and the front top plate, the butt welds between the middle top plate of the boom and the rear top plate, the welds between the outer plate of the front fork of the boom and the tail of the side plate, and the fillet welds between the bent plate and the side plate of the boom front fork. Among them, the faulty parts of the boom and the service li...

Embodiment 2

[0098] Figure 5 It is a schematic diagram of the life evaluation system of the working device of the excavator provided by the second embodiment of the present invention.

[0099] refer to Figure 5 , the system consists of:

[0100] The fault location determining unit 1 is used to determine the fault location of the working device of the excavator and the service life corresponding to the fault location;

[0101] The test unit 2 is used to test the fault location to obtain the S-N curve and load spectrum;

[0102] The loading stress amplitude acquisition unit 3 is used to obtain the loading stress amplitude of the fault part under the sinusoidal loading condition according to the S-N curve and the service life;

[0103] The calculated life acquisition unit 4 is used to obtain the calculated life of the fault part according to the S-N curve and the load spectrum;

[0104] The stress amplitude acquisition unit 5 is used to obtain the equivalent sinusoidal loading stress am...

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Abstract

The invention provides a method and a system for evaluating the service life of an excavator working device. The method comprises the following steps: determining a fault part of the excavator workingdevice and the service life corresponding to the fault part; testing the fault part to obtain an SN curve and a load spectrum; according to the SN curve and the service life, obtaining the loading stress amplitude of the fault part under the sine loading load condition; according to the S-N curve and the load spectrum, obtaining the calculation life of the fault part; obtaining an equivalent sineloading stress amplitude according to the calculated life, the service life, the loading stress amplitude and the S-N curve; comparing the equivalent sine loading stress amplitude with the loading stress amplitude; determining whether the service life of the excavator working device meets the design requirement or not according to a comparison result, so that whether the service life of an excavator boom meets the design requirement or not can be effectively evaluated, and the evaluation period is short.

Description

technical field [0001] The invention relates to the technical field of hydraulic excavators, in particular to a life evaluation method and system for working devices of the excavator. Background technique [0002] The boom is one of the main structural parts of the excavator's working device. Since the boom is the main force-bearing component, its failure rate is high, which has a great impact on the service life of the excavator. [0003] In recent years, with the rise of labor costs, excavators have become more and more widely used, not only in the field of engineering, but also in large mines, so that the application conditions of excavators are more extensive. [0004] At present, the evaluation method for the life of the excavator arm mainly adopts the two-axis bench test. When the stress cycle reaches the preset number of times, it is determined that the life of the excavator arm meets the design requirements. However, the above method has a long test cycle and takes ...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F30/17G06F119/14G06F119/04
CPCG06F30/20G06F30/17G06F2119/04G06F2119/14
Inventor 杨双桥於为刚顾亚辉
Owner SANY HEAVY MACHINERY
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