Steerable microcomputer control electro-hydraulic servo fatigue testing machine and testing method thereof

Abstract

The invention discloses a steerable microcomputer-controlled electro-hydraulic servo fatigue testing machine and a testing method thereof, and belongs to the technical field of material fatigue testing equipment.The steerable microcomputer-controlled electro-hydraulic servo fatigue testing machine comprises a fixed bottom table, a rack, a cross beam arranged on the fixed bottom table and provided with the size of a sample to be tested and capable of moving up and down through hydraulic control, and a steering assembly, the steering assembly is fixedly arranged below the cross beam, the actuator is hinged to the steering assembly in an angle rotation mode, the output end of the actuator is provided with a clamping part used for clamping a to-be-tested sample, and the clamping part is provided with a plurality of sensors used for detecting fatigue state test parameters of the to-be-tested sample; 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. According to the steerable microcomputer control electro-hydraulic servo fatigue testing machine and the testing method thereof, the device is simple in structure, and the loading test operation is convenient.

Description

Technical Field

[0001] The invention belongs to the technical field of material fatigue testing equipment, and in particular relates to a steerable microcomputer-controlled electro-hydraulic servo fatigue testing machine and a testing method thereof. Background Art

[0002] Fatigue testing machine is a kind of equipment used to test the fatigue performance of materials, components or products under long-term or high-frequency loads. According to the test type and purpose, fatigue testing machines can be divided into high-cycle fatigue testing machines, low-cycle fatigue testing machines, bending fatigue testing machines, tension and compression fatigue testing machines, etc. Fatigue testing machines are generally composed of controllers, loading devices, sample holders, test samples, measurement systems, and mechanical structures. The sample holders fix the test samples so that the loading device can perform fatigue tests on the samples. In addition, the measurement system also has certain differences depending on the different measured samples, such as sensors or extensometers. The loading device is generally set on one side of the sample holder to indirectly apply force to the test sample. Due to the high flexibility and ease of use, high degree of automation and high measurement accuracy of fatigue testing machines, they have been widely used in the fields of automobiles, aerospace, electronics, energy, etc.

[0003] In the field of traditional fatigue testing machines, most equipment has certain limitations when conducting fatigue tests on materials or components. These devices are often simple in design and single in function, and cannot meet the diverse needs of modern industry for material testing. Especially when conducting multi-directional loading tests, traditional equipment often requires complex operating procedures and additional adjustment equipment, which not only increases the difficulty of the test, but also prolongs the test cycle and affects the test efficiency. Once the adjustment direction is inconsistent with 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. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a steerable microcomputer-controlled electro-hydraulic servo fatigue testing machine and a testing method thereof, wherein the device has a simple structure and convenient loading test operation.

[0005] To achieve the above object, the present invention is implemented by adopting the following technical solutions: In a first aspect, the present invention provides a steerable microcomputer-controlled electro-hydraulic servo fatigue testing machine, comprising: Fixed base, The frame is arranged on the fixed base and is provided with a crossbeam which can be moved up and down by hydraulic control according to the size of the sample to be tested. A steering assembly is fixedly arranged below the crossbeam, The actuator is hinged to the steering assembly in an angularly rotatable manner, and a clamping portion for clamping the sample to be tested is provided at the output end, and a plurality of sensors for detecting fatigue state test parameters of the sample to be tested are arranged on the clamping portion; The lower clamping part is arranged on the fixed base, cooperates with the clamping part of the actuator and is located below the actuator.

[0006] Furthermore, the steering assembly includes a steering base and a retractable pull rod, one end of the steering base is fixed under the cross beam, and the other end of the steering base is hinged between the bolt passing through the pressure plate and the rotating end of the actuator; one end of the retractable pull rod is hinged to the side of the cross beam, and the other end is hinged to the middle of the actuator, the steering base, the retractable pull rod and the actuator form a variable triangular shape in the vertical direction, and the retractable pull rod can rotate the output end of the actuator around the steering base angle by adjusting the length of the pull rod.

[0007] Furthermore, the clamping portion is configured with a concave opening clamping groove and a V-shaped clamping block arranged in the clamping groove and hydraulically driven for closed clamping and detachable. The two V-shaped clamping blocks are configured so that the upper parts are connected to the inner wall of the clamping groove by tensioning a reset spring, and the sizes of the clamping groove and the V-shaped clamping block are determined according to the size of the sample to be tested, and are used to clamp the sample to be tested.

[0008] Furthermore, the sensor is installed on the top end of the cylinder piston rod of the actuator through a locking ring, and the sensor includes a displacement sensor, a load sensor and a counting sensor.

[0009] Furthermore, the lower clamping part and its support are fixed to the fixed base by T-bolts and M16 nuts.

[0010] Furthermore, the frame is provided with at least two vertical poles fixed to the fixed base, and the two ends of the crossbeam are movably arranged on the poles up and down and are connected to the servo motor drive.

[0011] Furthermore, it also includes a control system, which is electrically controlled and connected to the servo motor, the actuator, and the sensor, and measures the test force, displacement, and deformation test parameters of the test sample through the sensor.

[0012] In a second aspect, the present invention provides a test method for a steerable microcomputer-controlled electro-hydraulic servo fatigue testing machine as described in any one of the first aspects, comprising the following steps: Step S1: directly loading the sample to be tested on the lower clamp, or loading the sample to be tested on the corresponding tooling, and fixing it on the fixed base through T-bolts or screws and matching nuts; Step S2: Adjust the hydraulic drive of the clamping part to the loose state, remove the stretch reset spring with a flat-blade screwdriver, replace the appropriate V-shaped clamp block according to the size of the sample to be tested, and reinstall the stretch reset spring; before installation, be sure to clean the impurities on the surface of the jaws and apply molybdenum disulfide grease on the guide surface; Step S3: The control system controls the crossbeam to move up and down to a preset position through hydraulic pressure, and adjusts the length of the pull rod to make the output end of the actuator rotate with the clamping part around the steering base in a vertical plane. After adjusting to a suitable direction, the V-shaped clamping block of the clamping part clamps the test sample on the lower clamping part below to ensure that it is in a locked state; Step S4: The test stretching or fatigue process is precisely controlled by the control system, and the corresponding test parameters of the test force, displacement and deformation are measured by the sensor.

[0013] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the steerable microcomputer-controlled electro-hydraulic servo fatigue testing machine and the test method thereof of the present invention are equipped with a crossbeam which can be moved up and down according to the size of the sample to be tested and through hydraulic control, a steering assembly fixedly arranged under the crossbeam, which is hinged to the steering assembly and can be rotatable at an angle and is provided with a clamping part for clamping the sample to be tested at the output end, and a lower clamping part which cooperates with the clamping part of the actuator and is located below the actuator, and the clamping part is provided with a plurality of sensors for detecting the test parameters of the fatigue state of the sample to be tested, and the device has a simple structure, convenient loading test operation and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional schematic diagram of a steerable microcomputer-controlled electro-hydraulic servo fatigue testing machine provided according to an embodiment of the present invention.

[0015] Figure 2 It is a three-dimensional schematic diagram of the actuator in the horizontal direction.

[0016] Figure 3 It is a structural schematic diagram of the steering assembly.

[0017] Figure 4 It is a structural schematic diagram of the clamping part and the lower clamping part.

[0018] In the figure: 1. Frame; 2. Fixed base; 3. Column; 4. Crossbeam; 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. Pressure plate of steering assembly; 15. Retractable pull rod; 16. Ring lock buckle; 17. Support. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0022] like Figure 1 and Figure 2 As shown, a steerable microcomputer-controlled electro-hydraulic servo fatigue testing machine is provided in an embodiment of the present invention, which is used for fatigue testing of metal samples. The testing machine includes a fixed base 2, which can be fixed on the ground or other equipment. A gantry frame 1 composed of four columns 3 is vertically fixed to the upper part of the fixed base 2. A crossbeam 4 that can be moved up and down by hydraulic control is arranged on the frame 1. The up and down position of the crossbeam 4 can be adjusted according to the size of the sample to be tested, thereby adapting to different scenes or product testing requirements. The base 5 of the steering assembly is fixed to the lower part of the crossbeam 4; the actuator 6 is hinged to the base 5 of the steering assembly by bolts passing through the pressure plate 14. The output end of the actuator 6 is provided with a clamping part 7 for clamping the sample to be tested; the clamping part 7 is provided with a plurality of sensors 8 for detecting the fatigue state test parameters of the sample to be tested. The lower clamping part 9 and its support 17 are fixed to the fixed base 2 by T-bolts and M16 nuts. The background control system (computer) automatically and accurately controls the test process and automatically measures the test parameters such as test force, displacement, and deformation.

[0023] In this embodiment, the control system is equipped with a manual control box 10 fixed to a column through a rotatable connecting arm. The manual control box 10 can control the lifting and lowering of the beam 4 to adapt to the sample size; and control the upper and lower clamps 9 to clamp the sample to be tested for fatigue testing; in addition, the manual control box 10 can perform centering and alignment processing of the clamping part 7 and the lower clamp 9.

[0024] like Figure 4 As shown, initially, the state of a pair of locking rings 11 is aligned at the notch, and the sensor 8 and the locking ring 11 are installed on the end of the cylinder piston rod of the actuator. Two hook wrenches are used to clamp the round hole of the locking ring 11. The two hook wrenches apply force 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 counting sensor detects that the number of tests reaches the preset value, the fatigue testing machine stops running.

[0025] like Figure 4 As shown, 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. The lower clamping part 9 is mounted on the support 17 and is installed on the fixed base 2 through the hexagon socket screw and the matching buckle, but the hexagon socket screw cannot be locked. V-shaped clamping blocks 12 are provided in the clamping part 7 and the lower clamping part 9. The appropriate V-shaped clamping blocks 12 can be replaced according to the size of the sample to be tested to achieve the best test effect. The specifications and dimensions of the clamping blocks are marked on the side of the clamping blocks. The V-shaped clamping blocks 12 are connected to the inner side of the concave clamping grooves of the clamping part 7 and the lower clamping part 9 through the spring 13, and are used to clamp the sample to be tested. When replacing the test sample block, first adjust the hydraulic clamp to the loose state, use a flat screwdriver to remove the tension spring 13 from the inner pillar of the concave clamping groove of the clamping part 7 and the lower clamping part 9, take out the original clamp block 12, and replace the required clamp block specifications. Before installation, pay attention to clean the impurities on the surface of the jaws and apply molybdenum disulfide grease on the guide surface. Install the tension spring pillar, lock it and hang the spring 13 on the inner pillar of the concave clamping groove.

[0026] like Figure 1~Figure 4 As shown, install the sample to be tested, and first install the sample to be tested on the clamping part 7, and control the clamp switch of the clamping part through the hand control box 10 to clamp the clamp block of the clamping part 7. Adjust the height of the crossbeam 4 until the lower end of the sample can be loaded into the V-shaped clamp block 12 of the lower clamping part 9, and turn the switch of the lower clamping part 9 to the clamping state. If the sample cannot be fixed directly by the lower clamping part 9 or a fatigue test in other directions (non-vertical) is performed, it is fixed on the fixed base 2 by buckles, nut rods, pressure plates and nuts.

[0027] like Figure 3As shown, the steering assembly consists of a pressure plate 14, a base 5 and a retractable pull rod 15. The base 5 is welded to the pressure plate 14 and fixed to the bottom of the cross beam 4 by a number of bolts passing through the base; one end of the retractable pull rod 15 is hinged to the pressure plate 14 by an annular lock buckle 16 or other means, and the other end is hinged to the middle position of the actuator 6, and the output end of the actuator 6 can be rotated around the pressure 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 fatigue test direction of the specimen.

[0028] In this embodiment, the technical solution of the present application also provides a fatigue test method based on a steerable microcomputer-controlled electro-hydraulic servo fatigue testing machine, wherein the fatigue test method specifically includes the following steps: First, replace the V-shaped clamp 12 of the clamping part 7 according to the size of the sample. If the lower clamp 9 is used to clamp the other end of the sample, the built-in V-shaped clamp 12 also needs to be replaced. Clamp one end of the sample with the lower clamp 9 of the fatigue testing machine or fix the sample on the fixed base through buckles, nut rods, clamping plates and nuts. Align the actuator 6 with the middle position of the sample by adjusting the centering device of the lower clamp 9 front and back, left and right; adjust the crossbeam 4 of the fatigue testing machine up and down so that the actuator is at a suitable height for fatigue testing.

[0029] Secondly, adjust the direction of the actuator 6 according to the test requirements. The purpose of adjusting the actuation direction of the actuator is achieved by adjusting the length of the pull rod 15 hinged on the crossbeam 4 of the fatigue testing machine. Use a wrench to fix the retractable pull rod 15 to stabilize the actuator 6 in the actuation direction. The background control system (computer) actuates the actuator 6 of the fatigue testing machine, and the actuator 6 moves the clamping part 7 of the fatigue testing machine to a suitable position to clamp and fix the specimen. The high-precision dynamic load sensor, high-resolution magnetostrictive displacement sensor and actuator are all connected to the background control system (computer); under the feedback of the sensor 8, the background control system (computer) drives the actuator to make the clamping part 7 of the fatigue testing machine reciprocate back and forth, so that the specimen can withstand the fatigue load in a given direction; Finally, the amplitude, frequency, number of fatigue tests and the protection load of the fatigue testing machine are set through the background control system (computer), and the specimen is subjected to fatigue load test to obtain relevant test parameter data.

[0030] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A steerable microcomputer-controlled electro-hydraulic servo fatigue testing machine, characterized in that: include: Fixed base, The frame is arranged on the fixed base and is provided with a crossbeam which can be moved up and down by hydraulic control according to the size of the sample to be tested. A steering assembly is fixedly arranged below the crossbeam, The actuator is hinged to the steering assembly in an angularly rotatable manner, and a clamping portion for clamping the sample to be tested is provided at the output end, and a plurality of sensors for detecting fatigue state test parameters of the sample to be tested are arranged on the clamping portion; The lower clamping part is arranged on the fixed base, cooperates with the clamping part of the actuator and is located below the actuator.

2. The steerable microcomputer-controlled electro-hydraulic servo fatigue testing machine according to claim 1 is characterized in that: The steering assembly includes a steering base and a retractable pull rod, one end of the steering base is fixed under the cross beam, and the other end of the steering base is hinged between the bolt passing through the pressure plate and the rotating end of the actuator; one end of the retractable pull rod is hinged to the side of the cross beam, and the other end is hinged to the middle of the actuator, the steering base, the retractable pull rod and the actuator form a variable triangular shape in the vertical direction, and the retractable pull rod can rotate the output end of the actuator around the steering base angle by adjusting the length of the pull rod.

3. The steerable microcomputer-controlled electro-hydraulic servo fatigue testing machine according to claim 2 is 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 hydraulically driven to close and clamp and is detachable. The two V-shaped clamping blocks are configured so that the upper parts are connected to the inner wall of the clamping groove by stretching a reset spring, and the sizes of the clamping groove and the V-shaped clamping block are determined according to the size of the sample to be tested, and are used to clamp the sample to be tested.

4. The steerable microcomputer-controlled electro-hydraulic servo fatigue testing machine according to claim 1 is characterized in that: The sensor is installed at the top end of the cylinder piston rod of the actuator through a locking ring, and the sensor includes a displacement sensor, a load sensor and a counting sensor.

5. The steerable microcomputer-controlled electro-hydraulic servo fatigue testing machine according to claim 3 is characterized in that: The lower clamping part and its support are fixed to the fixed base by T-bolts and M16 nuts.

6. The steerable microcomputer-controlled electro-hydraulic servo fatigue testing machine according to claim 1, characterized in that: The frame is provided with at least two vertical poles fixed to the fixed base, and the two ends of the crossbeam are movably arranged on the poles and connected to the servo motor drive.

7. The steerable microcomputer-controlled electro-hydraulic servo fatigue testing machine according to claim 1 is characterized in that: It also includes a control system, which is electrically controlled and connected to the servo motor, the actuator, and the sensor, and measures the test force, displacement, and deformation test parameters of the sample to be tested through the sensor.

8. A test method for a steerable microcomputer-controlled electro-hydraulic servo fatigue testing machine as claimed in any one of claims 1 to 7, characterized in that: The steps include: Step S1: directly loading the sample to be tested on the lower clamp, or loading the sample to be tested on the corresponding tooling, and fixing it on the fixed base through T-bolts or screws and matching nuts; Step S2: Adjust the hydraulic drive of the clamping part to the loose state, remove the stretch reset spring with a flat-blade screwdriver, replace the appropriate V-shaped clamp block according to the size of the sample to be tested, and reinstall the stretch reset spring; before installation, be sure to clean the impurities on the surface of the jaws and apply molybdenum disulfide grease on the guide surface; Step S3: The control system controls the crossbeam to move up and down to a preset position through hydraulic pressure, and adjusts the length of the pull rod to make the output end of the actuator rotate with the clamping part around the steering base in a vertical plane. After adjusting to a suitable direction, the V-shaped clamping block of the clamping part clamps the test sample on the lower clamping part below to ensure that it is in a locked state; Step S4: The test stretching or fatigue process is precisely controlled by the control system, and the corresponding test parameters of the test force, displacement and deformation are measured by the sensor.

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