Electro-hydraulic servo fatigue testing machine based on PLC

Abstract

The utility model relates to the technical field of workpiece testing, and discloses a PLC-based electro-hydraulic servo fatigue testing machine which comprises a workbench, a testing head is arranged at the top end of the workbench, a protective door is rotatably connected to the front end of the workbench, and a switching mechanism is arranged at the top end of the workbench; the switching mechanism comprises a rotating ring, a movable column is slidably connected to the inner wall of the workbench, a positioning block is fixedly connected to the outer arc face of the top end of the movable column, a flat plate clamp is fixedly connected to the rear end of the rotating ring, a circular clamp is fixedly connected to the front end of the rotating ring, and a guiding piece is arranged on the inner wall of the workbench. And an adjusting mechanism is arranged at the top end of the moving block. According to the utility model, after the protective door is opened, a group of bolts are released for limiting, the movable block is driven to move, the movable column moves upwards to drive the positioning block to move so as to release the limiting of the rotating ring, the rotating ring is rotated to complete switching, and the overall operation is more convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to workpiece test technical field especially relates to a kind of electro-hydraulic servo fatigue testing machine based on PLC. BACKGROUND

[0002] The electro-hydraulic servo fatigue testing machine based on PLC can simulate various complex actual working conditions under alternating load, such as simulating the vibration loading of automobile parts in the driving process, the air dynamic alternating load of aircraft structure in flight, so as to accurately test the fatigue life, fatigue limit and other key performance indicators of materials or parts.

[0003] When different workpieces are tested, different clamps are needed. For example, when testing a flat plate, a flat plate clamp is used, and when testing a round workpiece, a round clamp is needed. The corresponding clamp is usually fixed in place by bolts. When different clamps need to be replaced, the appropriate wrench or other tool must be selected, and then the bolts are removed and fixed by screwing. Then select the appropriate clamp, position and install it, and tighten the bolts in the reverse direction to achieve the purpose of fixation. The entire clamp replacement process includes tool preparation, bolt disassembly, clamp handling, positioning and installation, and bolt retightening, which requires multiple steps and takes a lot of time. Therefore, an electro-hydraulic servo fatigue testing machine based on PLC is proposed to solve the above problems. SUMMARY

[0004] To make up for the above shortcomings, the utility model provides an electro-hydraulic servo fatigue testing machine based on PLC, which aims to improve the problem of replacing the clamp in the prior art.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: an electro-hydraulic servo fatigue testing machine based on PLC, comprising a workbench, a test head is arranged at the top end of the workbench, a protective door is rotatably connected to the front end of the workbench, and a switching mechanism is arranged at the top end of the workbench.

[0006] The switching mechanism includes a rotating ring, an activity column is slidably connected to the inner wall of the workbench, a positioning block is fixedly connected to the top end outer arc surface of the activity column, a flat plate clamp is fixedly connected to the rear end of the rotating ring, a circular clamp is fixedly connected to the front end of the rotating ring, a guide is arranged on the inner wall of the workbench, a moving block is arranged on the outer wall of the guide, a connecting plate is rotatably connected to the outer wall of the moving block, a bolt is threadedly connected to the inner wall of the moving block, a support plate is fixedly connected to the inner wall of the workbench, and an adjusting mechanism is arranged at the top end of the moving block.

[0007] Further description of the above technical scheme:

[0008] The guide piece comprises a guide plate, a rear end of the guide plate is fixedly connected to an inner wall of the workbench, and an inner wall of the moving block is slidably connected to an outer wall of the guide plate.

[0009] As a further description of the above technical solution:

[0010] A bottom end of the rotating ring is rotatably connected to a top end inner wall of the workbench, and an outer wall of the positioning block is inserted into an inner wall of the rotating ring.

[0011] As a further description of the above technical solution:

[0012] A top end of the connecting plate is rotatably connected to a bottom end of the movable column.

[0013] As a further description of the above technical solution:

[0014] A bottom end of the screw is threadedly connected to a top end inner wall of the guide plate, and a front end of the guide plate is fixedly connected to an inner wall of the supporting plate.

[0015] As a further description of the above technical solution:

[0016] The adjusting mechanism comprises a fixed block, an inner wall of the fixed block is rotatably connected with a rotating plate, a top end of the rotating plate is fixedly connected with a handle, an inner wall of the rotating plate is elastically connected with an insertion plate through a connecting spring, and a bottom end of the insertion plate is inserted into an inner wall of the fixed block.

[0017] As a further description of the above technical solution:

[0018] A bottom end of the fixed block is fixedly connected to a top end of the moving block.

[0019] As a further description of the above technical solution:

[0020] One end of the connecting spring is fixedly connected to an outer wall of the insertion plate, the other end of the connecting spring is fixedly connected to an inner wall of the rotating plate, and the outer wall of the insertion plate penetrates and is slidably connected to the inner wall of the rotating plate.

[0021] The utility model has the advantages of the following:

[0022] 1、The utility model discloses a workbench, a test head and a switching mechanism are matched with each other, a group of bolts are removed after the protective door is opened, the moving block is driven to move, the movable column is driven to move upwards, the positioning block is driven to move, the rotating ring is limited, the rotating ring is rotated to complete switching, and the whole operation is convenient.

[0023] 2. The utility model discloses, through the mutual cooperation of the adjusting mechanism and other structures of setting, when needing to move the moving block, can pinch two groups of the inserted board and then rotate, and the rotation is ninety degrees, and the moving block and the rotating plate lengthen as a whole, and the workbench is exposed, then moves to the rotating ring direction, and the moving block operation is more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 A whole three-dimensional schematic view of the electro-hydraulic servo fatigue testing machine based on PLC is provided in the utility model;

[0025] Fig. 2 A workbench section internal schematic view of the electro-hydraulic servo fatigue testing machine based on PLC is provided in the utility model;

[0026] Fig. 3 A rotating plate section internal schematic view of the electro-hydraulic servo fatigue testing machine based on PLC is provided in the utility model.

[0027] LEGEND:

[0028] 1, workbench, 2, protective door, 3, test head, 4, switching mechanism, 401, rotating ring, 402, movable column, 403, positioning block, 404, flat clamp, 405, circular clamp, 406, guide plate, 407, connecting plate, 408, moving block, 409, support plate, 410, bolt, 5, adjusting mechanism, 501, rotating plate, 502, handle, 503, fixed block, 504, inserted board, 505, connecting spring. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0030] REFERENCE Figs. 1-2 An embodiment provided by the utility model: an electro-hydraulic servo fatigue testing machine based on PLC, comprising a workbench 1, the top end of the workbench 1 is provided with a test head 3, the test head 3 can move in the vertical direction, and corresponding fatigue test is carried out through the test head 3, this is prior art and will not be explained too much, the front end of the workbench 1 is rotatably connected with a protective door 2, and the top end of the workbench 1 is provided with a switching mechanism 4; the protective door 2 can be rotated and opened to facilitate the operation of the switching mechanism 4 and the switching mechanism 4, and the switching mechanism 4 can be quickly switched according to the workpiece to be tested.

[0031] With reference to Figs. 1-3 , the switching mechanism 4 comprises a rotating ring 401, and the switching purpose is achieved through rotation of the rotating ring 401; the inner wall of the workbench 1 is slidably connected with a movable column 402; the outer arc surface of the top end of the movable column 402 is fixedly connected with a positioning block 403, and the movement trajectories of the two are consistent; the rear end of the rotating ring 401 is fixedly connected with a flat clamp 404; the front end of the rotating ring 401 is fixedly connected with a circular clamp 405; the flat clamp 404 and the circular clamp 405 are driven to rotate and switch through rotation of the rotating ring 401, so as to correspond to the test head 3 and facilitate test experiments; and the rotating ring 401 can also be installed with other shape clamps, such as wedge-shaped clamps and V-shaped clamps, etc.; the inner wall of the workbench 1 is provided with a guide piece, the outer wall of the guide piece is provided with a moving block 408, the guide piece can guide the moving block 408 to move horizontally, the outer wall of the moving block 408 is rotatably connected with a connecting plate 407, the connecting plate 407 is driven to rotate through movement of the moving block 408, the inner wall of the moving block 408 is threadedly connected with a bolt 410, the bolt 410 can limit and fix the moving block 408, the inner wall of the workbench 1 is fixedly connected with a support plate 409, the support plate 409 can support the guide piece, and the top end of the moving block 408 is provided with an adjusting mechanism 5, which facilitates manual movement of the moving block 408.

[0032] With reference to Figs. 1-3 , the guide piece comprises a guide plate 406, the rear end of the guide plate 406 is fixedly connected to the inner wall of the workbench 1, the inner wall of the moving block 408 is slidably connected to the outer wall of the guide plate 406, the middle of the guide plate 406 is provided with a cylinder, and the two sides are provided with flat plates, so as to guide the moving block 408 to move horizontally, the bottom end of the rotating ring 401 is rotatably connected to the top end inner wall of the workbench 1, the rotating setting facilitates manual adjustment of rotation, the outer wall of the positioning block 403 is inserted into the inner wall of the rotating ring 401, the two are inserted to avoid rotation of the rotating ring 401, and when the positioning block 403 moves upward, the rotating ring 401 can rotate, the top end of the connecting plate 407 is rotatably connected to the bottom end of the movable column 402, the rotating setting avoids movement interference, so as to drive the connecting plate 407 to rotate and drive the movable column 402 to move, the bottom end of the bolt 410 is threadedly connected to the top end inner wall of the guide plate 406, the two are threadedly connected to limit and fix the moving block 408, the front end of the guide plate 406 is fixedly connected to the inner wall of the support plate 409, and the support plate 409 can support and fix the guide plate 406.

[0033] With reference to Figs. 2-3The adjusting mechanism 5 comprises two groups of fixed blocks 503, the two groups of fixed blocks 503 are L-shaped, the inner wall of the fixed block 503 is rotationally connected with a rotating plate 501, the top end of the rotating plate 501 is fixedly connected with a handle 502, the rotating plate 501 is rotated to be horizontal to facilitate manual movement of the moving block 408, and is vertical to facilitate storage; the handle 502 is arranged to facilitate manual rotation of the rotating plate 501; the inner wall of the rotating plate 501 is elastically connected with a plug-in plate 504 through a connecting spring 505, the bottom end of the plug-in plate 504 is plugged into the inner wall of the fixed block 503, the plug-in plate 504 is provided with two groups, and the two groups of plug-in plates 504 are L-shaped; the inner wall of the fixed block 503 is provided with two groups of square insertion holes, so as to facilitate insertion and fixation of the bottom end of the plug-in plate 504; the bottom end of the fixed block 503 is fixedly connected with the top end of the moving block 408, the fixed block 503 can support the moving block 408; one end of the connecting spring 505 is fixedly connected with the outer wall of the plug-in plate 504, the other end of the connecting spring 505 is fixedly connected with the inner wall of the rotating plate 501, the outer wall of the plug-in plate 504 penetrates and is slidingly connected with the inner wall of the rotating plate 501, and the plug-in plate 504 has the functions of resetting and limiting through the elasticity of the connecting spring 505.

[0034] Working principle: when the fatigue test is needed, the operator first determines which fixture to use according to the shape of the workpiece to be tested. If the workpiece to be tested is flat, the flat fixture 404 needs to be switched; if it is circular, the circular fixture 405 needs to be switched.

[0035] In the initial state, the positioning block 403 is inserted in the inner wall of the rotating ring 401, limiting the rotation of the rotating ring 401, at this time the whole switching mechanism 4 is in the locked state, when the clamp is to be switched, first open the protective door 2, then hold the handle 502, pinch the exposed part of the two sets of plug-in plates 504 to the middle, and then the two sets of plug-in plates 504 will move to the middle to close, thereby releasing the limiting of the two sets of plug-in plates 504 and the two sets of fixed blocks 503, at this time the rotating plate 501 can be turned down, so that the rotating plate 501 changes from the vertical state to the horizontal state, and then the two sets of plug-in plates 504 are sent away, so that the two sets of plug-in plates 504 are fixed with the square insertion hole below the fixed block 503, then the bolt 410 can be screwed to release the limiting of the bolt 410 and the guide plate 406, and then the rotating plate 501 is pushed forward, so that the moving block 408 moves towards the side of the rotating ring 401, thereby driving the two sets of connecting plates 407 to rotate and promoting the movable column 402 to move upwards, driving the corresponding positioning block 403 to move, releasing the limiting of the positioning block 403 and the rotating ring 401, at this time the rotating ring 401 can be rotated, promoting the corresponding clamp to rotate, and corresponding to the bottom end of the test head 3, thereby clamping and fixing the workpiece to be tested, starting the workbench 1 to make the test head 3 test operation, the test head 3 is accurately controlled by the PLC, and can test the specimen in the vertical direction according to the preset load, displacement, frequency and waveform parameters, obtain accurate fatigue performance data of the specimen, and provide a strong basis for material or part quality evaluation and design optimization.

[0036] Finally, it should be noted that: the above only for preferred embodiments of the present application, and not for limiting the present application, although the foregoing detailed description of the present application is made with reference to the foregoing embodiments, for those skilled in the art, it still can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, shall be included in the protection scope of the present application.

Claims

1. A PLC-based electro-hydraulic servo fatigue testing machine comprising a workbench (1), characterized in that: The top end of the workbench (1) is provided with a test head (3), the front end of the workbench (1) is rotatably connected with a protective door (2), and the top end of the workbench (1) is provided with a switching mechanism (4); The switching mechanism (4) comprises a rotating ring (401), the inner wall of the workbench (1) is slidably connected with a movable column (402), the top end outer arc surface of the movable column (402) is fixedly connected with a positioning block (403), the rear end of the rotating ring (401) is fixedly connected with a flat clamp (404), the front end of the rotating ring (401) is fixedly connected with a circular clamp (405), the inner wall of the workbench (1) is provided with a guide, the outer wall of the guide is provided with a moving block (408), the outer wall of the moving block (408) is rotatably connected with a connecting plate (407), the inner wall of the moving block (408) is threadedly connected with a bolt (410), the inner wall of the workbench (1) is fixedly connected with a supporting plate (409), and the top end of the moving block (408) is provided with an adjusting mechanism (5).

2. The electro-hydraulic servo fatigue testing machine based on PLC according to claim 1, characterized in that: The guide comprises a guide plate (406), the rear end of the guide plate (406) is fixedly connected to the inner wall of the workbench (1), and the inner wall of the moving block (408) is slidably connected to the outer wall of the guide plate (406).

3. The PLC-based electro-hydraulic servo fatigue testing machine according to claim 1, characterized in that: The bottom end of the rotating ring (401) is rotatably connected to the inner wall of the top end of the workbench (1), and the outer wall of the positioning block (403) is inserted into the inner wall of the rotating ring (401).

4. The PLC-based electro-hydraulic servo fatigue testing machine according to claim 1, characterized in that: The top end of the connecting plate (407) is rotatably connected to the bottom end of the movable column (402).

5. The PLC-based electro-hydraulic servo fatigue testing machine according to claim 1, characterized in that: The bottom end of the bolt (410) is threadedly connected to the inner wall of the top end of the guide plate (406), and the front end of the guide plate (406) is fixedly connected to the inner wall of the supporting plate (409).

6. The PLC-based electro-hydraulic servo fatigue testing machine according to claim 1, characterized in that: The adjusting mechanism (5) comprises a fixed block (503), the inner wall of the fixed block (503) is rotatably connected with a rotating plate (501), the top end of the rotating plate (501) is fixedly connected with a handle (502), the inner wall of the rotating plate (501) is elastically connected with a plug-in plate (504) through a connecting spring (505), and the bottom end of the plug-in plate (504) is inserted into the inner wall of the fixed block (503).

7. The PLC-based electro-hydraulic servo fatigue testing machine according to claim 6, characterized in that: The bottom end of the fixed block (503) is fixedly connected to the top end of the moving block (408).

8. The PLC-based electro-hydraulic servo fatigue testing machine according to claim 6, characterized in that: One end of the connecting spring (505) is fixedly connected to the outer wall of the plug-in plate (504), the other end of the connecting spring (505) is fixedly connected to the inner wall of the rotating plate (501), and the outer wall of the plug-in plate (504) penetrates and slidably connects to the inner wall of the rotating plate (501).

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