A pendulum mechanism for an impact testing machine

Abstract

The utility model is suitable for the technical field of impact testing machine, provides a pendulum mechanism of impact testing machine, rotatable transversely is provided with a rotating shaft on the mounting bracket, is provided with pendulum assembly on the rotating shaft, the pendulum assembly includes a rotatable sleeve setting on the rotating shaft rotating ring and a clutch, is provided with the proximity switch for determining and adjusting the movement zero point of rotating ring or hammer head on the mounting bracket, is also provided with the encoder of detecting the rotating angle of rotating ring. The pendulum mechanism of impact testing machine, through the proximity switch accurate determination motion absolute zero point, encoder real -time detection pendulum rotation angle, avoid artificial calibration error, ensure that the impact energy stable output, improve test result reliability, rely on clutch and drive assembly linkage, realize the automatic lifting of pendulum, the encoder perception rebound after impact and control clutch energization stop pendulum, avoid secondary impact interference test result, test result is more accurate.

Description

Technical Field

[0001] This utility model belongs to the technical field of impact testing machines, and particularly relates to a pendulum mechanism for an impact testing machine. Background Technology

[0002] A pendulum impact testing machine is a type of impact testing machine used to determine the impact resistance of metallic materials under dynamic load, thereby judging the quality of the material under dynamic load.

[0003] The patent with publication number CN223021798U, entitled "A Pendulum Device for an Impact Testing Machine," uses a structure consisting of a support plate, lifting plate, transmission rod, connecting arm, pendulum, motor, and insert plate to achieve pendulum height adjustment. This allows for adjustment of the pendulum height to impact different objects according to different testing needs, and the operation is relatively simple. However, this device lacks precision in height adjustment, lacking accurate scale markings or electronic measurement feedback, making it difficult to ensure consistency in height adjustment each time. This affects the accurate setting of impact energy and interferes with the accuracy of material impact toughness testing. Furthermore, there is no structure to control the pendulum's rebound after a single impact, which could cause the pendulum to cause a secondary impact on the sample. Therefore, it has some shortcomings in use. Utility Model Content

[0004] This invention provides a pendulum mechanism for an impact testing machine, aiming to solve the problems of insufficient accuracy in the lifting height of the hammer, lack of a braking structure, and easy generation of secondary impacts in existing impact testing machines.

[0005] This utility model is implemented as follows: a pendulum mechanism for an impact testing machine includes a mounting frame, a rotating shaft is rotatably and laterally arranged on the mounting frame, a driving component for driving the rotating shaft to rotate is arranged on the mounting frame, and a pendulum assembly is arranged on the rotating shaft.

[0006] The pendulum assembly includes a rotating ring rotatably fitted on the rotating shaft and a clutch. A hammer rod is arranged radially on the outer wall of the rotating ring, and a hammer head is arranged at the other end of the hammer rod. The clutch controls the rotating ring to rotate synchronously with the rotating shaft to raise the hammer, or to disengage the rotating ring from the rotating shaft to allow the hammer head to fall freely.

[0007] The mounting bracket is equipped with a proximity switch for determining and adjusting the zero point of motion of the rotating ring or hammer, and also with an encoder for detecting the rotation angle of the rotating ring.

[0008] Preferably, the clutch includes a clutch fixed plate and a clutch moving plate. The clutch fixed plate rotates synchronously with the rotating shaft, and the clutch moving plate is coaxially fixedly connected to the rotating ring. When the clutch is energized, the clutch moving plate engages with the clutch fixed plate, causing the rotating ring to rotate synchronously with the clutch fixed plate.

[0009] Preferably, the drive assembly includes a drive motor and a coupling, wherein the output shaft of the drive motor is connected to the rotating shaft through the coupling to achieve drive.

[0010] Preferably, it also includes a positioning plate, which is fixedly connected to the clutch plate.

[0011] Preferably, the clutch plate is fixedly mounted on the rotating shaft by a flat key.

[0012] Preferably, the mounting bracket is further provided with a support for supporting the encoder.

[0013] Beneficial effects

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: The pendulum mechanism of the impact testing machine of this utility model accurately determines the absolute zero point of motion through a proximity switch and the encoder detects the rotation angle of the pendulum in real time, avoiding manual calibration errors, ensuring stable output of impact energy, and improving the reliability of test results; relying on the linkage between the clutch and the drive component, the pendulum is automatically raised, and after the impact, the encoder senses the rebound and controls the clutch to energize and stop the pendulum, avoiding secondary impact interference with the test results, making the test results more accurate and the level of intelligence higher. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the pendulum assembly in this utility model;

[0017] Figure 3 This is a partial structural schematic diagram of the present invention.

[0018] In the diagram: 1-mounting bracket, 2-drive motor, 3-coupling, 4-rotating shaft, 5-rotating ring, 6-clutch fixed plate, 7-clutch moving plate, 8-encoder, 9-bracket, 10-, 11-proximity switch, 12-hammer rod, 13-hammer head, 14-. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0020] Please see Figure 1-3 This utility model provides a technical solution: a pendulum mechanism for an impact testing machine, wherein a rotating shaft 4 is rotatably arranged laterally on the mounting frame 1, a driving component for driving the rotating shaft 4 to rotate is provided on the mounting frame 1, and a pendulum assembly is provided on the rotating shaft 4.

[0021] The drive assembly includes a drive motor 2 and a coupling 3. The output shaft of the drive motor 2 is connected to the rotating shaft 4 through the coupling 3 to achieve drive.

[0022] The drive motor 2 is a servo motor that can rotate in both directions. By changing the direction of rotation, the rotation direction of the rotating shaft 4 is changed, which in turn changes the rotation direction of the mounting ring 5, thus achieving the effect of changing the direction of the hammer.

[0023] The pendulum assembly includes a rotating ring 5 rotatably mounted on a rotating shaft 4 and a clutch. A hammer rod 12 is arranged radially on the outer wall of the rotating ring 5, and a hammer head 13 is arranged at the other end of the hammer rod 12. The clutch controls the rotating ring 5 to rotate synchronously with the rotating shaft 4 to raise the hammer, or to disengage the rotating ring 5 from the rotating shaft 4 so that the hammer head 13 falls freely.

[0024] The rotating ring 5 is rotatably connected to the rotating shaft 4 via a bearing and can rotate relative to the rotating shaft 4.

[0025] In this embodiment, the clutch includes a clutch fixed plate 6 and a clutch moving plate 7. The clutch fixed plate 6 rotates synchronously with the rotating shaft 4, and the clutch moving plate 7 is coaxially fixedly connected to the rotating ring 5. When the clutch is energized, the clutch moving plate 7 engages with the clutch fixed plate 6, causing the rotating ring 5 and the clutch fixed plate 6 to rotate synchronously.

[0026] The clutch fixed plate 6 is fixedly mounted on the rotating shaft 4 by a flat key, and the clutch moving plate 7 is fixedly mounted on the side of the rotating ring 5 facing the clutch fixed plate 6. There is a small gap of about 0.2mm between the clutch fixed plate 6 and the clutch moving plate 7, and the clutch moving plate 7 is elastic and can deform. When the clutch is energized, the clutch fixed plate 6 attracts the clutch moving plate 7, causing it to deform and engage with the clutch fixed plate 6, so that the clutch moving plate 7 can rotate synchronously with the clutch fixed plate 6. During the engagement process, the rotating ring 5 will not move circumferentially. In this state, the rotating shaft 4 rotates, which can drive the rotating ring 5 to rotate synchronously through the clutch, realizing the swinging hammer. When it rotates to a certain angle, the clutch is de-energized, and the clutch moving plate 7 separates from the clutch fixed plate 6. At this time, the rotating ring 5 is not restricted by the clutch and rotates under the gravity of the hammer head 13 and the hammer rod 12, thus automatically falling back to achieve the pendulum effect.

[0027] The mounting bracket 1 is equipped with a proximity switch 11 for determining and adjusting the zero point of motion of the rotating ring 5 or the hammer head 13, and also with an encoder 8 for detecting the rotation angle of the rotating ring 5.

[0028] It also includes a controller, which can be a PLC or a microcontroller, used to preset experimental parameters, read data from proximity switch 11 and encoder 8, and control the start, stop, forward and reverse rotation of drive motor 2 and the energization and de-energization of clutch.

[0029] The controller can use control modules from existing mature technologies, as long as they can meet the control requirements of this technical solution.

[0030] In this embodiment, encoder 6 is located on the other side of rotating ring 5, and encoder 8 is a ring encoder, coaxially arranged with rotating ring 5, which can detect the rotation angle of rotating ring 5. The controller reads the detection data, and when the rotation reaches the preset angle of the controller, the controller controls the drive component to stop working, and the clutch is de-energized, releasing the pendulum to achieve the impact. After the pendulum rebounds after one impact, the encoder senses the rebound, re-energizes the clutch, stops the impact process, and prevents secondary impacts.

[0031] For example, the zero point position is set when the hammer head 13 is directly below and the hammer rod 12 is in a vertical state. When the mounting ring 5 is driven to rotate to raise the hammer, the rotation of the mounting ring 5 gradually increases to 30° or other angles between 0 and 90°. After rotating to this angle, the controller controls the drive motor 2 to stop rotating and de-energizes the clutch, causing the hammer head 13 to fall back. After passing the zero point position, it reaches an angle between -30° or 0 and -90°. After impacting the sample, it bounces back again. During the bounce back, it will pass the zero point position again. At this time, the encoder 8 detects that the mounting ring 5 has passed the zero point position, proving that one impact has ended. The controller reads the detection signal of the encoder 8. In order to avoid the hammer head 13 swinging back and forth and interfering with the test, the clutch is energized to brake the rotating ring 5 and stop the hammer head 13 from swinging.

[0032] The encoder 8 is an incremental encoder. Since it cannot automatically determine the accurate zero point position when it is powered on, it can only use the position when it is powered on as the zero point position. Therefore, a reference point needs to be determined. So, it is necessary to first determine that the mounting ring 5 is in the absolute zero point position, and then the encoder 8 is powered on. Only when the mounting ring 5 rotates can the actual rotation angle be accurately detected.

[0033] Therefore, a proximity switch 11 is set up, with a point on the clutch plate 6 as a reference. The proximity switch 11 detects the distance from the reference. When this distance is the preset distance, it proves that the absolute zero position is at this moment. Then, the encoder 8 is powered on, and then the rotating ring 5 is driven to rotate the hammer. The encoder 8 detects the rotation angle.

[0034] It also includes a positioning plate 10, which is fixedly connected to the clutch plate 6 by bolts. The proximity switch 11 uses a bolt on the positioning plate 10 as a reference to determine the absolute zero position. If the proximity switch 11 detects that the screw is not at the absolute zero position, the controller controls the drive motor 2 to rotate forward or backward until the rotating shaft 4 rotates to the absolute zero position. Then, the encoder 8 is energized, the encoder 8 returns to zero, the clutch is energized and engaged, and the drive motor 2 is controlled to drive the mounting ring 5 to rotate and raise the hammer.

[0035] The mounting bracket 1 is also equipped with a bracket 9 that supports the encoder 8.

[0036] The pendulum assembly can be set to two or more sets to meet different testing needs. Similarly, the proximity switch 11 and encoder 8 are set to the corresponding number.

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pendulum mechanism for an impact testing machine, comprising a mounting frame (1), characterized in that: A rotating shaft (4) is rotatably arranged laterally on the mounting frame (1), a driving assembly for driving the rotating shaft (4) to rotate is provided on the mounting frame (1), and a pendulum assembly is provided on the rotating shaft (4); The pendulum assembly includes a rotating ring (5) rotatably fitted on the rotating shaft (4) and a clutch. A hammer rod (12) is arranged radially on the outer wall of the rotating ring (5), and a hammer head (13) is arranged at the other end of the hammer rod (12). The clutch controls the rotating ring (5) to rotate synchronously with the rotating shaft (4) to realize the hammer lifting, or to disengage the rotating ring (5) from the rotating shaft (4) so ​​that the hammer head (13) falls back freely. The mounting bracket (1) is provided with a proximity switch (11) for determining and adjusting the zero point of motion of the rotating ring (5) or the hammer (13), and is also provided with an encoder (8) for detecting the rotation angle of the rotating ring (5).

2. The pendulum mechanism of an impact testing machine as described in claim 1, characterized in that: The clutch includes a clutch fixed plate (6) and a clutch moving plate (7). The clutch fixed plate (6) rotates synchronously with the rotating shaft (4). The clutch moving plate (7) is coaxially fixedly connected to the rotating ring (5). When the clutch is energized, the clutch moving plate (7) engages with the clutch fixed plate (6) to make the rotating ring (5) rotate synchronously with the clutch fixed plate (6).

3. The pendulum mechanism of an impact testing machine as described in claim 1, characterized in that: The drive assembly includes a drive motor (2) and a coupling (3). The output shaft of the drive motor (2) is connected to the rotating shaft (4) through the coupling (3) to achieve drive.

4. The pendulum mechanism of an impact testing machine as described in claim 2, characterized in that: It also includes a positioning plate (10), which is fixedly connected to the clutch plate (6).

5. The pendulum mechanism of an impact testing machine as described in claim 2, characterized in that: The clutch plate (6) is fixedly mounted on the rotating shaft (4) by a flat key.

6. The pendulum mechanism of an impact testing machine as described in claim 1, characterized in that: The mounting bracket (1) is also provided with a bracket (9) for supporting the encoder (8).

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