Electro-hydraulic servo fatigue testing machine

Abstract

The utility model discloses an electro-hydraulic servo fatigue testing machine, which belongs to the technical field of material fatigue testing equipment, and comprises a fixed bottom table, a rack, a cross beam, a steering component, an actuator, a servo motor, a servo motor, a servo motor, a servo motor, a servo motor, a servo motor, a servo motor, a servo motor and a servo motor, the clamping assembly is hinged to the steering assembly in an angular rotation mode, a clamping part used for clamping a to-be-tested sample is arranged at the output end of the clamping assembly, and a plurality of sensors used for detecting fatigue state test parameters of the to-be-tested sample are arranged on the clamping part; and the lower clamping part is arranged on the fixed bottom table, is matched with the clamping part of the actuator for use and is positioned below the actuator. The electro-hydraulic servo fatigue testing machine provided by the utility model is simple in device structure and convenient in loading test operation.

Description

Technical Field

[0001] The utility model belongs to the technical field of material fatigue testing equipment, and in particular relates to an electro-hydraulic servo fatigue testing machine. Background Art

[0002] A fatigue testing machine is a device used to test the fatigue properties of materials, components, or products under prolonged or high-frequency loads. Depending on the test type and purpose, fatigue testing machines can be categorized as high-cycle fatigue testing machines, low-cycle fatigue testing machines, bending fatigue testing machines, and tension-compression fatigue testing machines. A fatigue testing machine generally consists of a controller, a loading device, a sample holder, a test sample, a measurement system, and a mechanical structure. The sample holder secures the test sample so that the loading device can perform fatigue testing on it. Furthermore, the measurement system varies depending on the sample being tested, with options such as sensors or extensometers. The loading device is typically located on one side of the sample holder, indirectly applying force to the test sample. Due to their flexibility, ease of use, high degree of automation, and high measurement accuracy, fatigue testing machines have found widespread application in the automotive, aerospace, electronics, and energy sectors.

[0003] In the field of traditional fatigue testing machines, most equipment has limitations when performing fatigue testing on materials or components. These devices often have simple designs and limited functions, failing to meet the diverse material testing needs of modern industry. Especially when performing multi-directional loading tests, traditional equipment often requires complex operating procedures and additional adjustment equipment, which not only increases the difficulty of testing, but also prolongs the testing cycle and affects testing efficiency. If the adjustment direction does not match the design requirements, the fatigue testing machine cannot provide accurate test data, which to a certain extent affects the accuracy and reliability of the test results. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and to provide an electro-hydraulic servo fatigue testing machine with a simple device structure and convenient loading test operation.

[0005] In order to achieve the above-mentioned purpose, the present invention is implemented by adopting the following technical solutions.

[0006] On the one hand, the utility model provides an electro-hydraulic servo fatigue testing machine, comprising:

[0007] Fixed base,

[0008] The frame is set on the fixed base and is equipped with a crossbeam that can be moved up and down by hydraulic control according to the size of the sample to be tested.

[0009] A steering assembly is fixedly arranged below the crossbeam,

[0010] an actuator, which is angularly rotatable and hingedly connected to the steering assembly, and is provided with a clamping portion at an output end for clamping a sample to be tested, and a plurality of sensors are arranged on the clamping portion for detecting fatigue state test parameters of the sample to be tested;

[0011] a lower clamping portion, which is arranged on the fixed base and cooperates with the clamping portion of the actuator and is located below the actuator.

[0012] Further, the steering assembly comprises a steering base and a telescopic pull rod, one end of the steering base is fixed below the cross beam, and the other end of the steering base is hingedly connected between the rotating end of the actuator and the bolt passing through the pressing plate; one end of the telescopic pull rod is hingedly connected to the side surface of the cross beam, and the other end is hingedly connected to the middle part of the actuator, the steering base, the telescopic pull rod and the actuator form a variable triangle shape in the vertical direction, and the telescopic pull rod can make the output end of the actuator angularly rotate around the steering base by adjusting the length of the pull rod.

[0013] Further, the clamping portion is provided with a concave opening clamping groove and V-shaped clamping blocks arranged in the clamping groove and driven by hydraulic pressure to close and be detachable, the two V-shaped clamping blocks are arranged with the upper part connected to the inner wall of the clamping groove through a tension return spring, and the size of the clamping groove and the V-shaped clamping blocks is determined according to the size of the sample to be detected, for clamping the sample to be tested.

[0014] Further, the sensor is installed at the top end of the oil cylinder piston rod of the actuator through a locking ring, and the sensor comprises a displacement sensor, a load sensor and a counting sensor.

[0015] Further, the lower clamping portion and its support are fixed on the fixed base through a T-shaped bolt and an M16 nut.

[0016] Further, at least two vertical stand rods are arranged on the rack and fixed to the fixed base, the cross beam is movably arranged at the two ends of the vertical stand rods and is drivingly connected with a servo motor.

[0017] Further, a control system is further included, which is electrically connected with the servo motor, the actuator and the sensor respectively, and measures the test force, displacement and deformation test parameters of the sample to be tested through the sensor.

[0018] Compared with the prior art, the electric-hydraulic servo fatigue testing machine has the advantages that: the electric-hydraulic servo fatigue testing machine is provided with a cross beam which can move up and down according to the size of a sample to be tested and through hydraulic control, a steering assembly fixedly arranged below the cross beam, a clamping part which can be angularly rotated and is hingedly connected to the steering assembly and is provided with a clamping part for clamping the sample to be tested at an output end, and a lower clamping part which is used in cooperation with the clamping part of the actuator and is located below the actuator, a plurality of sensors for detecting fatigue state test parameters of the sample to be tested are arranged on the clamping part, the device has simple structure, convenient loading test operation and strong practicability. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a perspective view of an electric-hydraulic servo fatigue testing machine according to an embodiment of the present application.

[0020] Figure 2 It is a perspective view of the actuator in a transverse direction.

[0021] Figure 3 It is a structural view of the steering assembly.

[0022] Figure 4 It is a structural view of the clamping part and the lower clamping part.

[0023] In the drawings:

[0024] 1, frame; 2, fixed base; 3, stand; 4, cross beam; 5, base of steering assembly; 6, actuator; 7, clamping part; 8, sensor; 9, lower clamping part; 10, hand control box; 11, locking ring; 12, clamping block; 13, spring; 14, pressing plate of steering assembly; 15, telescopic pull rod; 16, annular lock; 17, support. DETAILED DESCRIPTION

[0025] The present application will be further described below in conjunction with the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and cannot be used to limit the protection scope of the present application.

[0026] In the description of the utility model, it needs to be understood that, the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" and the like can be explicitly or implicitly included one or more. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0027] In the description of the utility model, it needs to be explained that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood through specific circumstances.

[0028] As shown in Figure 1 and Figure 2 The utility model embodiment provides a kind of electro-hydraulic servo fatigue testing machine, for the fatigue test of metal sample.Therein, test machine includes fixed base 2, can be fixed on ground or other equipment.By four uprights 3 consisting of portal frame 1 is vertically fixed on fixed base 2 upper portion, frame 1 is configured with a through hydraulic control movable crossbeam 4, can be adjusted the up-down position of crossbeam 4 according to the size of sample to be tested, to adapt to different scene or product test demand in turn.The base 5 of steering assembly is fixed in the lower portion of crossbeam 4;Actuator 6 is hinged to the base 5 of steering assembly by bolt passing through pressing plate 14.The output end of actuator 6 is configured with the clamping part 7 for clamping sample to be tested;Clamping part 7 is provided with a plurality of sensors 8 for detecting the fatigue state test parameters of sample to be tested.The lower clamp 9 and its support 17 are fixed in fixed base 2 by T-shaped bolt and M16 nut.Backstage control system (computer) automatically accurately controls test process, and automatically measures test force, displacement, deformation and other test parameters.

[0029] In this embodiment, the control system is configured with a hand control box 10 fixed to a column through a rotatable connecting arm, which can control the lifting of the cross beam 4 to adapt to the size of the sample; and control the upper and lower clamping parts 9 to clamp the sample to be tested for fatigue test; in addition, the hand control box 10 can also control the centering and alignment of the clamping part 7 and the lower clamping part 9.

[0030] As shown in Figure 4 , initially, a pair of locking rings 11 are aligned at the gap, the sensor 8 and the locking ring 11 are installed at the end of the piston rod of the actuator, two wrenches are used to clamp the round hole of the locking ring 11, and the two wrenches are forced in opposite directions to lock the sensor 8. When the value detected by the load sensor or displacement sensor exceeds the preset instrument protection value, the fatigue testing machine stops running; when the test count detected by the counting sensor reaches the preset value, the fatigue testing machine stops running.

[0031] As shown in Figure 4 , the clamping part 7 and the lower clamping part 9 are both controlled by hydraulic pressure, the clamping part 7 is connected to the actuator 6 through the locking ring 11, and the lower clamping part 9 is installed on the support 17 and is installed on the fixed base 2 through the internal hexagonal screw and the matching buckle, but the internal hexagonal screw cannot be locked. V-shaped clamping blocks 12 are arranged in the clamping part 7 and the lower clamping part 9, and appropriate V-shaped clamping blocks 12 can be replaced according to the size of the sample to be tested, so as to achieve the best test effect. The size of the clamping block is marked on the side of the clamping block, and the V-shaped clamping block 12 is connected to the inner side of the concave clamping groove of the clamping part 7 and the lower clamping part 9 through the spring 13, which is used for clamping the sample to be tested. When the sample to be tested is replaced, first adjust the hydraulic clamp to the loose state, remove the tension spring 13 from the inner side of the concave clamping groove of the clamping part 7 and the lower clamping part 9, remove the original clamping block 12, replace the required clamping block size, and pay attention to clean the impurities on the surface of the clamping block before installation, and apply molybdenum disulfide grease on the guide surface. Install the tension spring support, lock and hang the spring 13 on the inner side of the concave clamping groove.

[0032] As shown in Figures 1-4 , install the sample to be tested, preferentially install the sample to be tested in the clamping part 7, and control the clamping switch of the clamping part through the hand control box 10 to clamp the clamping block of the clamping part 7. Adjust the height of the cross beam 4 to the lower end of the sample to be able to be installed in the V-shaped clamping block 12 of the lower clamping part 9, and rotate the switch of the lower clamping part 9 to the clamping state. If the sample cannot be directly fixed by the lower clamping part 9 or other direction (non-vertical) fatigue test is performed, it is fixed on the fixed base 2 through the buckle, nut rod, pressing plate and nut.

[0033] As shown in Figure 3As shown, the steering assembly is composed of the pressing plate 14, the base 5 and the telescopic pull rod 15. Among them, the base 5 is welded with the pressing plate 14 and is fixed below the cross beam 4 through several bolts passing through the base; the telescopic pull rod 15 is hinged at one end to the pressing plate 14 through the ring-shaped lock 16 or other ways, and is hinged at the other end to the middle position of the actuator 6, and can make the output end of the actuator 6 rotate around the pressing plate within a certain preset angle by adjusting the length of the pull rod 15, and the position of the actuator 6 is determined according to the direction of the sample fatigue test.

[0034] In the embodiment, the fatigue test operation method based on the electro-hydraulic servo fatigue testing machine provided by the technical scheme of the application is specifically described as follows.

[0035] Firstly, the V-shaped clamping block 12 of the clamping part 7 is replaced according to the size of the sample, and if the other end of the sample is clamped by the lower clamping part 9, the built-in V-shaped clamping block 12 also needs to be replaced. One end of the sample is clamped by the lower clamping part 9 of the fatigue testing machine or is fixed on the fixed base through buckles, nut rods, pressing plates, nuts and the like. The centering device of the lower clamping part 9 is adjusted front and back and left and right, so that the middle position of the actuator 6 is aligned with the sample; the cross beam 4 of the fatigue testing machine is adjusted to move up and down, so that the actuator is at a suitable height to facilitate the development of fatigue test.

[0036] Secondly, the direction of the actuator 6 is adjusted according to the test requirements. The length of the pull rod 15 hinged to the cross beam 4 of the fatigue testing machine is adjusted to achieve the purpose of adjusting the actuating direction of the actuator, and the telescopic pull rod 15 is fixed by a wrench to make the actuator 6 stable in the actuating direction. The background control system (computer) drives the actuator 6 of the fatigue testing machine to move the clamping part 7 to a suitable position to clamp and fix the sample. The high-precision dynamic load sensor, the high-resolution magnetostrictive displacement sensor and the actuator are connected with the background control system (computer); under the feedback action of the sensor 8, the background control system (computer) drives the actuator to make the clamping part 7 of the fatigue testing machine reciprocate, so as to realize that the sample bears the fatigue load in a given direction.

[0037] Finally, the amplitude, frequency, fatigue times and protection load of the fatigue testing machine of the fatigue load are set through the background control system (computer), the sample bears the fatigue load test, and the related test parameter data is obtained.

[0038] The above only describes preferred embodiments of the present application, and it should be pointed out that for ordinary skilled persons in the technical field, without departing from the technical principles of the present application, a number of improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the present application.

Claims

1. An electro-hydraulic servo fatigue testing machine characterized by comprising: It comprises: a fixed base, a frame arranged on the fixed base and configured with a crossbeam capable of moving up and down according to the size of the sample to be tested and controlled by hydraulic pressure, a steering assembly fixedly arranged below the crossbeam, an actuator angularly rotatable connected to the steering assembly and provided with a clamping portion at the output end for clamping the sample to be tested, the clamping portion being configured with a plurality of sensors for detecting the fatigue state test parameters of the sample to be tested, a lower clamping portion arranged on the fixed base and used in cooperation with the clamping portion of the actuator and located below the actuator.

2. The electro-hydraulic servo fatigue testing machine according to claim 1, characterized by The steering assembly comprises a steering base and an extendable pull rod, one end of the steering base is fixed below the crossbeam, and the other end of the steering base is hingedly connected between the rotating end of the actuator and the bolt passing through the pressing plate; one end of the extendable pull rod is hingedly connected to the side surface of the crossbeam, and the other end is hingedly connected to the middle part of the actuator, the steering base, the extendable pull rod and the actuator form a variable triangle shape in the vertical direction, and the extendable pull rod can make the output end of the actuator angularly rotate around the steering base by adjusting the length of the pull rod.

3. The electro-hydraulic servo fatigue testing machine according to claim 2, characterized in that, The clamping portion is configured with a concave opening clamping groove and a V-shaped clamping block arranged in the clamping groove and driven by hydraulic pressure to close and detach, the two V-shaped clamping blocks are configured with upper parts connected to the inner wall of the clamping groove by tension return springs, and the size of the clamping groove and the V-shaped clamping block is determined according to the size of the sample to be detected for clamping the sample to be tested.

4. The electro-hydraulic servo fatigue testing machine according to claim 3, characterized in that, The sensor is installed on the top end of the oil cylinder piston rod of the actuator through a locking ring, and the sensor comprises a displacement sensor, a load sensor and a counting sensor.

5. The electro-hydraulic servo fatigue testing machine according to claim 3, wherein The lower clamping portion and its support are fixed on the fixed base by T-shaped bolts and M16 nuts.

6. The electro-hydraulic servo fatigue testing machine according to claim 1, characterized by The frame is configured with at least two vertical stand bars fixed on the fixed base, the movable ends of the crossbeam are arranged through the stand bars, and the movable ends are drivingly connected with servo motors.

7. The electro-hydraulic servo fatigue testing machine according to any one of claims 1 to 6, characterized by It further comprises a control system electrically connected with the servo motor, the actuator and the sensor, respectively, and measures the test force, displacement and deformation test parameters of the sample to be tested through the sensor.

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