CN203037544U - Mechanical pushing fatigue testing machine - Google Patents

Abstract

The utility model discloses a mechanical push fatigue testing machine, which belongs to the field of structural experiment mechanics. It is mainly composed of steel frame, power mechanism, deceleration mechanism, elliptical wheel mechanism, adjustment mechanism and corrosion device. The basic principle is that the motor changes the output speed through the reducer to meet the needs of the working mechanism, and then converts the circular motion into a linear motion through the movement of the elliptical wheel, and the push rod is connected with the elastic element. By adjusting the elastic element and the push The length of the rod is used to adjust the size of the reaction force, so as to realize the application of precise reciprocating fatigue load, and at the same time, if the elastic element is removed, the fatigue test of displacement control can be carried out. The utility model has the characteristics of high precision.

Description

Mechanical push fatigue testing machine

technical field

The utility model relates to a mechanical pushing multifunctional corrosion fatigue testing machine, which belongs to the field of structural experiment mechanics.

Background technique

In aviation, navigation, transportation, road and bridge, building, and port engineering structures, beams and elastic elements of various materials are typical stressed components, and they are all under repeated stress in various environments for a long time, so this type of components Fatigue strength in various environments is an important research topic in structural mechanics. Especially in the design of modern engineering structures, it is necessary to study the strength of components under complex environments and loads. It is urgent to realize such loads and environmental states in the laboratory to assess the fatigue strength of components and make a contribution to the next step of theoretical establishment. Prepare. the

For a long time, it has been very difficult to achieve low-cost corrosion fatigue tests for this type of components. At present, it can be realized by hydraulic servo fatigue testing machine, but because these equipment are expensive, they have strict requirements on the use environment, and high energy consumption and long-term use require high test costs.

Some current mechanical corrosion fatigue testing machines, because the loading device simply adopts displacement control loading, so within the elastic range, the structural deformation is small, and the accuracy of the load is completely realized by the displacement accuracy. Therefore, the accuracy requirements of the test load cannot be guaranteed, resulting in poor test results, especially for small-sized test pieces.

Utility model content

The purpose of the utility model is to provide a mechanical push fatigue testing machine with high precision.

A mechanical push fatigue testing machine, characterized in that it includes a support frame and a loading device; wherein the loading device includes a horizontal motor fixedly installed on the support frame, a power source shaft connected to the horizontal motor through a reducer, and a power source shaft installed on the power source The elliptical wheel of the shaft; it also includes a linear bearing and a reaction force sleeve fixedly installed on the support frame and sequentially located below the ellipse wheel; the top of the reaction force sleeve has a first hole, and the inside of the reaction force sleeve is sequentially Install gaskets, springs, loading pressure head, height-adjustable adjustment plate in the reaction cylinder, the adjustment plate has a second hole; the lower end of the above-mentioned loading pressure head protrudes out of the second hole on the adjustment plate and the test piece Contact: a push rod is installed inside the linear bearing, the upper end of the push rod is in contact with the elliptical wheel, and a force sensor is installed at the lower end; the lower end of the force sensor passes through the first hole on the top of the reaction sleeve and contacts the gasket.

The mechanical push-push fatigue testing machine is characterized in that the testing machine includes a corrosion device, and the corrosion device is composed of a water pump and a corrosion box located under the loading pressure head.

The mechanical push fatigue testing machine is characterized in that it includes the following steps: (1), configuring the corrosion solution, putting the test piece in the corrosion box, and controlling the entry and exit of the corrosion solution through a water pump; 2) Rotate the elliptical roulette, adjust the position of the elliptical roulette according to the requirement, then lock the elliptical roulette and the shaft of the power source; (3), start the power source, and use the adjustment plate to adjust the expansion and contraction of the spring; (4), through Further fine-tune the expansion and contraction of the elastic element to adjust the overall length of the ejector rod to meet the loading requirements of the specimen; conduct the corrosion fatigue test of the specimen.

The basic principle of the utility model of this corrosion fatigue testing machine is that the power mechanism and the deceleration mechanism work together. It is mainly loaded by a mechanical push-push multifunctional loading device, and then corroded by a corrosion device. The loading is a combination of mechanical movement and elastic elements. Through the principle that the force of the elastic element is proportional to the deformation, the stroke of the test displacement is enlarged, and the load error caused by the structural wear and mechanical clearance is reduced. Through the elliptical wheel, the locking bolt, the push rod, and the elastic element, the alignment of the beam, plate, Higher precision repetitive fatigue loading method for structural elements such as springs.

Main advantages: realize the joint action of corrosion and fatigue on the same test device; use a combination of mechanical movement and elastic elements to realize alignment of beams, plates, springs, etc. The method of repeated fatigue loading of structural elements; on the same test device, two test methods of force control and position control are realized; the test device is simple in structure, reliable in performance, and low in equipment cost; the test device is a low-energy product, energy-saving and environmentally friendly. Low cost; suitable for corrosion fatigue tests in special environments with low test frequency and long test period.

Expected benefits: This test device solves the technical problems of low-cost fatigue tests in special environments (high and low temperature, salt spray, sulfur dioxide and other corrosive environments) that require low test frequency and long test period in structural mechanics. Performance research provides a simple and easy test method and device. The designed unattended corrosion fatigue test device with low energy consumption and high reliability uses a set of test devices to realize the test method of force and displacement control fatigue loading and corrosion fatigue coupling. And the principle of the test device is clear, compact in structure, easy to use, low in manufacturing cost, and reusable. It is very suitable for testing large quantities of fatigue test pieces of new materials and structures, and has high engineering application value.

Description of drawings

Figure 1 is a front view of the test device;

Figure 2 is a side view of the test device (main components);

Figure 3 Schematic diagram of the bending test of the testing machine;

Figure 4 schematic diagram of testing machine shear test;

Figure 5 Auxiliary test equipment of corrosion fatigue machine;

Label names in the figure: 1. Reducer bolt hole 2. Power source shaft 3. Oval wheel 4. Locking bolt 5. Reducer bracket 6. Push rod 7. Linear bearing 8. Force sensor 9. Gasket 10. Elastic element 11. Reaction shell 12. Adjusting plate 13. Loading test piece gasket 14. Test piece 15. Corrosion fatigue test box 16. Support frame, 17. Loading pressure head 18. Rigid steel plate 19. Water storage tank 20. Water pump 21 .Reducer 22. Motor 23. Threaded rod 24. Center hole 25. Steel plate 26. Test piece 27. Clamping device 28. Test piece

Detailed ways

The role of the main related components

Elliptical roulette: The movement of the elliptical roulette transforms the original circular motion into the linear motion of pushing through the push rod, so that the loading device provides linear pressure.

Linear bearing: a rolling bearing that makes the two raceways have relative linear motion in the rolling direction.

Push rod: a force transmission device, which converts the curve displacement difference of the elliptical disc into force, which is directly transmitted to the loaded test piece.

Motor: A device that converts electrical energy into mechanical energy, providing a power source for the entire corrosion fatigue machine.

Reducer: It is a power transmission mechanism that uses the speed converter of the gear to reduce the number of revolutions of the power machine to the desired number of revolutions, and obtain a larger torque mechanism, while also reducing the inertia of the load.

Elastic element: adjust and control the size of the reaction force through the elastic element, so as to achieve the purpose of force control.

Schematic diagram of other experimental parts of the corrosion fatigue machine

This corrosion fatigue machine is a mechanical push-push multifunctional corrosion fatigue testing machine. While performing corrosion fatigue, other experiments can be carried out by simply modifying the machine or using the attached equipment. As shown in Figure 3, Figure 4, and Figure 5, the fatigue machine can perform experiments such as bending test, shear test, tensile test and compression test.

Figure 3 Schematic diagram of the bending test of the testing machine; modification instructions: adjust the push rod of the corrosion fatigue testing machine, then place the test piece on the support (the distance can be adjusted), and use the machine to drive the push rod to apply concentrated force, thereby Perform a bend test.

Figure 4 Schematic diagram of the shear test of the testing machine; modification instructions: adjust the distance of the test piece support, and then use the clamping device to make the test piece as shown in the above picture, then clamp the test piece with the portal steel frame as shown in the figure, and drive the top through the elliptical wheel The push rod applies shear force to the specimen.

Figure 5 The threaded rod of the auxiliary experimental equipment of the corrosion fatigue machine has a nut to support the whole equipment, and the distance between the steel plates can be adjusted through the nut. The central hole allows the test piece to pass through the steel plates, making the test piece stable between the steel plates.

和钢板

之间，然后千斤顶置于钢板

和钢板

之间，使用千斤顶，千斤顶就会将钢板

向上顶，即相当于给钢板

一个向上的拉力，也就是起到了拉伸试验件的作用，而拉力的大小可以通过力学传感器测得。同样的，若将试验件仍然置于钢板

和钢板

之间，但是将千斤顶置于钢板

和钢板

之间，使用千斤顶，千斤顶会将钢板

向下压，即相当于给试验件一个压力，而压力的大小也可以通过力学传感器测得。 Modification instructions: The tensile and compression tests of the test piece can be carried out by using the auxiliary experimental equipment of the mechanical push-push multi-functional corrosion fatigue machine as shown in the figure. Fix the test piece to the steel plate with clamps and anchors

and steel plate

between, and then the jack is placed on the steel plate

and steel plate

Between, use the jack, the jack will put the steel plate

Upward, which is equivalent to giving the steel plate

An upward pulling force acts as a tensile test piece, and the magnitude of the pulling force can be measured by a mechanical sensor. Similarly, if the test piece is still placed on the steel plate

and steel plate

between, but place the jack on the steel plate

and steel plate

between, use a jack that will move the steel plate

Pressing down is equivalent to giving a pressure to the test piece, and the pressure can also be measured by a mechanical sensor.

Realize the basic principle of the utility model

This corrosion fatigue testing machine mainly achieves the purpose of fatigue loading through the mutual cooperation of the power mechanism, the deceleration mechanism and the loading mechanism; and then adds the work of the corrosion device to achieve corrosion while fatigue. Since the structural fatigue tests are all carried out within the elastic range of the material, the deformation of the structure is very small under the action of the load, so the requirements for the displacement and deformation of the corrosion fatigue machine are relatively high, especially the requirements for the displacement and deformation of the elliptical disc. High repeatability, and at the same time, due to the surface fatigue wear of the test piece and the stiffness drop of the test piece itself, it will cause a large load error of the test piece under the same displacement. The purpose of introducing the elastic element in the utility model is to form the required load for the fatigue test through the large deformation of the elastic element, reduce the load error caused by the above reasons, and solve the problem of directly using the loading device, deceleration mechanism, continuous The load accuracy problem that cannot be solved in the reciprocating motion fatigue loading test of the rod mechanism.

The fatigue loading device adopts the method of pushing the connecting rod by the elliptical wheel, which solves the problem of adjusting the displacement from 0 displacement, and can realize the small displacement fatigue test under the displacement control.

Claims (2)

1. A mechanical jacking fatigue testing machine, characterized in that it includes a support frame (16) and a loading device; wherein the loading device includes a horizontal motor (22) fixedly installed on the support frame, a reducer (21) and a horizontal The power source shaft (2) connected to the motor (22), the elliptical wheel disc (3) installed on the power source shaft (2); also includes the elliptical wheel disc (3) fixedly installed on the support frame (5) and sequentially located under the elliptical wheel disc (3) Linear bearing (7) and reaction sleeve (11); there is a first hole at the top of the reaction sleeve (11), and gaskets (9), springs ( 10), the loading pressure head (17), the height-adjustable adjustment plate (12) in the reaction force cylinder, the adjustment plate has a second hole; the lower end of the above-mentioned loading pressure head (17) protrudes out of the adjustment plate The second hole is in contact with the test piece; a push rod (6) is installed inside the above-mentioned linear bearing (7), the upper end of the push rod is in contact with the elliptical wheel, and a force sensor (8) is installed at the lower end; the lower end of the force sensor passes through the reaction sleeve The first hole in the top of the barrel is in contact with the gasket (9). 2. The mechanical jacking fatigue testing machine according to claim 1, characterized in that: the testing machine includes a corrosion device, and the corrosion device consists of a water pump (20) and a corrosion box (15) located below the loading head (17). )composition.

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