CN201716170U

CN201716170U - Welding fatigue test bed

Info

Publication number: CN201716170U
Application number: CN201020207476XU
Authority: CN
Inventors: 蒋跃军; 周锦佳; 黄相之
Original assignee: LIUZHOU LIHE EXHAUST CONTROL SYSTEM CO Ltd
Current assignee: LIUZHOU LIHE EXHAUST CONTROL SYSTEM CO Ltd
Priority date: 2010-05-28
Filing date: 2010-05-28
Publication date: 2011-01-19
Anticipated expiration: 2020-05-28

Abstract

The utility model discloses a welding fatigue test bed, which comprises a base for being fixedly connected with a test sample, and an output end arranged above the base for being fixedly connected with a vibration arm of one part of the sample, a force sensor and a displacement sensor are mounted on the vibration arm, the sensors are connected with a vibration control unit, an electromagnet is mounted between an input end of the vibration arm and the base, an exciting coil of the electromagnet is connected on an output end of a power amplifier, an input end of the power amplifier is connected with a digital signal function generator, and an input end of the digital signal function generator is connected on an output end of the vibration control unit. The utility model can be applied to part vibration fatigue tests in industries of machinery, automobile and the like, and can solve problems of high production costs and low reliability of the existing welding fatigue test bed compared with the prior art.

Description

The solder joint fatigue testing table

Technical field

The utility model relates to machinery manufacturing technology field, especially a kind of equipment that is used for parts are carried out experiment on fatigue properties.

Background technology

The fatigue break damage inactivation is the modal failure mode of parts in the mechanical engineering field, and fatigue break was lost efficacy and had defective mainly due to parts design or manufacturing, caused durable reliability to fail to meet design requirement.Durable reliability is one of parts important techniques index, and the vibration fatigue test of component of machine stand is the important means of judging parts design, making durable reliability.Can predict fatigue failure cycle of parts effectively by the stand vibration fatigue test, can effectively design, manufacturing defect be showed that deviser and fabricator give corresponding improvement according to test findings.

Stand vibration fatigue test feature is: the test period is long, load type is many, the load precision stability requires height, system to have characteristics such as multiple control modes.

The fatigue test board of engineering field use at present mostly is the hydraulic controlling type shaking table.Because hydraulic valve and the restriction of oil pump on control accuracy, the fluid pressure type fatigue test board is difficult during high frequency load more than output is higher than 100Hz realizes that precision is relatively poor; Hydraulic valve serviceable life is low to make that fluid pressure type vibration fatigue test platform cost is higher.

Summary of the invention

Problem to be solved in the utility model provides a kind of reliability height, the solder joint fatigue testing table that cost of manufacture is low.

In order to address the above problem, the technical solution adopted in the utility model is: this solder joint fatigue testing table, include and be used for fixing the pedestal that connects the test exemplar, be located at support top and be used for fixing the output terminal of the shaker arm that connects a part of exemplar, force transducer and displacement transducer are housed on shaker arm, sensor is connected with the vibration control unit, between the input end of described shaker arm and the pedestal electromagnet is housed, the field coil of this electromagnet is connected on the output terminal of a power amplifier, and the input end of described power amplifier is connected on the output terminal of described vibration control unit.

In the technique scheme, can be more specifically: described sensor has two, is respectively force transducer and displacement transducer, these two sensors successively series connection on described shaker arm; Described vibration control unit is connected into by the microcomputer controller chip, this microcomputer controller built-in chip type has the test standard value, and be provided with counting unit by program, monitoring unit, closed-loop control unit and logic judgment unit and signal function generator, this microcomputer controller chip output is connected to display.

Owing to adopted technique scheme, the utility model compared with prior art has following beneficial effect:

Adopted electromagnet to replace hydraulic cylinder of the prior art, adopt digital signal function generator and power amplifier to replace the solenoid valve of prior art, can improve the Load Control precision, reduce manufacturing cost greatly, and have a reliable operation, the advantage of long service life.

Description of drawings

Fig. 1 is the mechanical connecting structure synoptic diagram of the utility model embodiment;

Fig. 2 is the control circuit functional-block diagram of the utility model embodiment;

Fig. 3 is the control module flow chart of the utility model embodiment.

Embodiment

The utility model is described in further detail below in conjunction with example figure:

Solder joint fatigue testing table shown in Figure 1 includes and is used for fixing the pedestal 1 that connects test exemplar 7, be located at support top and be used for fixing the output terminal of the shaker arm 2 that connects 7 one parts of exemplar, series connection has force transducer 3 and displacement transducer 4 successively on shaker arm 2, the signal wire of

sensor

3,4 is connected with the input end of vibration control unit, electromagnet 5 is housed between shaker arm 2 and the pedestal, and the field coil of electromagnet 5 is connected on the output terminal of a power amplifier 6.

Shown in Figure 2, the vibration control unit is connected and composed by microcomputer controller chip and port circuit, the simulating signal with strength and displacement of

sensor

3,4 converts the data input pin that digital signal passes to the microcomputer controller chip to by the A/D converter of port circuit respectively, be provided with the standard value of test in the microcomputer controller chip internal memory, in the microcomputer controller chip, be provided with counting unit by program, monitoring unit, closed-loop control unit and logic judgment unit and signal function generator.Monitoring unit; sensor 3 is all received from A/D converter in the closed-loop control unit; 4 signal; and from microcomputer controller chip internal memory, transfer corresponding vibration mode data in the test standard; through after the calculation process of these unit; the closed-loop control unit is to logic judgment unit output closed-loop compensating signal; monitoring unit is being crossed in limited time to logic judgment unit output stopping signal; the metering unit reaches the limit back to logic judgment unit output stopping signal at number of times; logic judgment unit produces the digital control voltage signal according to this three tunnel signal controlling digital signal function generator; the digital control voltage signal sends analog vibration voltage control signal by D/A converter, and is transferred to power amplifier and field coil.The data output end of microcomputer controller chip is connected to display.

Fig. 3 is the power closed loop vibration of microcomputer controller chip, displacement monitoring program conceptual scheme.The logical operation of logic judgment unit is in the program conceptual scheme: if the force transducer value less than the test standard value, then the output signal function generator increases output voltage values; If force transducer value overgauge value then reduces output voltage values; If equate, then export constant voltage values; When the stored counts of metering unit reached standard value, counting unit provided stopping signal, and the output voltage values of signal function generator is 0; Perhaps when monitoring unit monitors the shift value value of being above standard; monitoring unit provides stopping signal equally, and the output voltage values of signal function generator is 0, and the unit of flip-flop number simultaneously stops counting; when the signal function generator was exported 0 voltage, shaking table stopped vibration.

In like manner, this program can realize that the control mode of displacement closed loop, power monitoring carries out vibration fatigue test.

Claims

1. solder joint fatigue testing table, include and be used for fixing the pedestal that connects the test exemplar, be located at support top and be used for fixing the output terminal of the shaker arm that connects a part of exemplar, force transducer and displacement transducer are housed on shaker arm, force transducer, displacement transducer are connected with the vibration control unit, it is characterized in that: between the input end of described shaker arm and the pedestal electromagnet is housed, the field coil of this electromagnet is connected on the output terminal of a power amplifier, and the input end of described power amplifier is connected on the output terminal of described vibration control unit.

2. solder joint fatigue testing table according to claim 1 is characterized in that: described sensor has two, is respectively force transducer and displacement transducer, these two sensors successively series connection on described shaker arm; Described vibration control unit is connected into by the microcomputer controller chip, this microcomputer controller built-in chip type has the test standard value, and be provided with counting unit by program, monitoring unit, closed-loop control unit and logic judgment unit and signal function generator, this microcomputer controller chip output is connected to display.