Product Display

1.1 power equipment

The power equipment consists of three parts: an electric motor, a reducer, and an eccentric wheel. The electric motor adopts the model produced by Shanghai Libiao Motor Co., LtdY100L-6A three-phase asynchronous motor with a speed of940r/minThe reducer is produced by Changzhou Shrek Transmission Machinery Co., Ltd. The model isBLD13-71-1.5Cycloid pinwheel reducer, eccentric wheel is customized, as shown in the actual picture1.2Based on the performance of the electric motor and reducer, the theoretical frequency can be calculated as 940 ÷ 71 ÷ 60=0.22HzThe actual measured machine speed is per hour840~850So the actual frequency is 0.23-0.24HzAt this low frequency, it helps to exert the effect of corrosion, making the coupling between corrosion and fatigue more pronounced.

1.2 Counting equipment

The counting device consists of a switch power supply, relays, counters, and proximity switches, as shown in the diagram for each part1.3Stick an iron or aluminum sheet onto the eccentric wheel (see figure)1.2（c））When the iron or aluminum plate passes through the proximity switch, the relay is triggered and the counter number increases by one, thus recording the number of rotations of the eccentric wheel, that is, the number of loading times.

1.3 control device

The control equipment consists of loading bolts, force sensors, and peak force gauges, as shown in the figure1.4The peak force measuring instrument adopts the model produced by Shanghai Meilike Automation Instrument Co., LtdGGD-331Peak force meter, force sensor is5tThe tension and pressure sensor. The maximum load is controlled by rotating the loading bolt, and the maximum load is sensed by the tension and pressure sensor, which displays the maximum force from the peak force meter. The left side of the peak load gauge displays the maximum load during each cycle of loading (less than)10kNNot displaying), the right side dynamically displays real-time loading force.

1.4 Corrosion box

The corrosion box is made of stainless steel material, and its size depends on the specific size of the test beam, which is slightly larger than the size of the test beam. Inside, there is a corrosive solution used for testing, which corrodes the small beam.

Use auxiliary components such as bearings, connecting rods, lugs, bolts, etc. to connect the above equipment into a whole and assemble it into the diagram2.4.1The self-made simple corrosion fatigue loading system shown.

This corrosion fatigue test loading system has a simple structure, clear force transmission, low cost, and can complete small beam corrosion fatigue tests at a low cost. It also has low power and low power consumption, which saves more testing costs. Due to being a first-time design, the design was not comprehensive enough, and there were also some issues with the machine during use.

Firstly, the design load is too small, resulting in frequent damage to certain components, such as the bolt at the connection between the connecting rod and the fixed rod, which has a diameter of only10mm, in20kNUnder cyclic loading, there have been several instances of damage; Secondly, the design is not precise enough, for example, the position of the eccentric wheel is slightly offset, resulting in a less tight connection between the connecting rod and the eccentric wheel. The bolts here are not only subjected to shear forces but also bending moments, and are prone to damage under the combined action of bending and shear; Furthermore, it can only be loaded at a single point, and only one beam can be tested at a time, so the testing efficiency still needs to be improved; Finally, the load is not stable enough and needs to be adjusted frequently.

On the basis of summarizing the experience of the system, improvements were made to its defects, and another set of experimental equipment with similar principles was developed, which can load large-sized beams (see figure)1.1（2））.

1.5Summary

We independently designed two sets of corrosion fatigue test loading systems, one large and one small. The system mainly consists of four parts: power equipment, counting equipment, control equipment, and corrosion box. The above devices are connected as a whole with auxiliary parts such as bearings, connecting rods, lugs, bolts, etc., and assembled into a simple corrosion fatigue loading system. On the basis of summarizing the experience of the system, improvements were made to its shortcomings, and another set of experimental equipment with similar principles was developed, which can load large-sized beams.