Pendulum bob locking structure for preventing secondary excitation
By using a pendulum locking structure to prevent secondary excitation and employing a planar spiral spring and a C-hook to limit the movement of the lifting ring, the problem of secondary excitation during the pendulum excitation process is solved, thus improving the accuracy and reliability of the experiment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-23
- Publication Date
- 2026-03-31
AI Technical Summary
During the pendulum excitation process, secondary excitation is difficult to avoid, which leads to unnecessary additional impacts on the test equipment and affects the accuracy and reliability of the test data.
A pendulum locking structure is adopted to prevent secondary excitation. The reciprocating motion of the lifting ring is restricted by the cooperation of a planar spiral spring and a C-shaped hook, thus preventing secondary excitation of the pendulum.
It effectively prevents secondary excitation of the pendulum, ensures that the impact load during the test is more realistic and stable, improves the test accuracy and reliability, and provides reliable technical support.
Smart Images
Figure CN224061201U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mechanical environment technology, and in particular to a pendulum locking structure to prevent secondary excitation. Background Technology
[0002] During spacecraft flight, numerous pyrotechnic separation devices (such as explosive bolts and separation nuts) are installed to ensure the successful completion of missions such as spacecraft-rocket separation and component deployment. However, the high-frequency, transient, and high-magnitude impacts generated by pyrotechnic explosions can damage or even destroy the precision electronic instruments inside the spacecraft, leading to launch failure. Therefore, ground tests are essential before any spacecraft launch mission.
[0003] Pyrotechnic impact ground tests are an important means of evaluating the ability of spacecraft and related equipment to withstand impact loads during launch. These tests simulate ground impact loads during actual launches to verify the performance and safety of equipment under severe impact. Traditional impact simulation methods typically employ mechanical impact tests, with pendulum excitation being a common choice.
[0004] However, secondary excitation of the pendulum is an unavoidable problem during pendulum excitation. Secondary excitation not only causes unnecessary additional impact on the testing equipment but may also affect the accuracy and reliability of the test data, thus impacting the validity of the test results.
[0005] Therefore, a locking structure is urgently needed to prevent secondary excitation of the pendulum, ensure that the impact load during the test is more realistic and stable, improve the accuracy and reliability of the test, and provide more reliable technical support for pyrotechnic impact ground tests. Utility Model Content
[0006] This utility model addresses the shortcomings of existing technologies by providing a pendulum locking structure to prevent secondary excitation. It uses a pair of planar spiral springs to reset the rotating part and a pair of planar spiral springs to reset the C-shaped hooks. The C-shaped hooks limit the reciprocating motion of the lifting ring and limit the pendulum by the reset C-shaped hooks, thus preventing secondary excitation of the pendulum.
[0007] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:
[0008] A pendulum locking structure to prevent secondary excitation includes a fixed part and a rotating part. The fixed part is mounted on a pendulum bracket. The rotating part includes a rotating body, a first rotating end, and a second rotating end, which are located at opposite ends of the rotating body. The first rotating end is rotatably connected to the fixed part via a cylindrical pin, and the second rotating end is rotatably connected to a C-shaped hook via a cylindrical pin. A planar spiral spring is provided between the first cylindrical pin and the fixed part, and the planar spiral spring is used to drive the rotating part to reset. A planar spiral spring is provided between the second cylindrical pin and the second rotating end, and the planar spiral spring is used to drive the C-shaped hook to reset. The upper part of the pendulum is rotatably mounted on the pendulum bracket, and a lifting ring is fixed to the top of the pendulum. When the pendulum is excited once, the bottom of the pendulum is at its lowest point, and the lifting ring is disengaged from the rotating part. After the pendulum completes one excitation, the lifting ring abuts against the reset C-shaped hook, and the bottom of the pendulum is located on the side opposite to the excitation direction at the lowest point of the first excitation.
[0009] The beneficial effects of the above technical solution are as follows: Before excitation, the bottom of the pendulum is manually pulled up so that the hanging ring abuts against the bottom of the rotating body. Then the pendulum is released, and the bottom of the pendulum gradually moves downward. The hanging ring gradually lifts the rotating body. When the bottom of the pendulum reaches its lowest point, the pendulum is excited once, and the hanging ring disengages from the rotating part. The first planar spiral spring can reset the rotating part. After the pendulum completes one excitation, due to the conservation of momentum, the bottom of the pendulum gradually moves upward. The hanging ring first contacts and presses down on the C-shaped hook until it disengages from the C-shaped hook. The second planar spiral spring can reset the C-shaped hook. Due to the conservation of momentum, after the bottom of the pendulum reaches its highest point, it gradually moves downward until the hanging ring abuts against the reset C-shaped hook. At this time, the bottom of the pendulum is located on the side away from the excitation direction at the lowest point of the first excitation, preventing the pendulum from being excited a second time. The pendulum locking structure is simple in structure, low in cost, and highly adaptable to the environment. Considering all factors, the pendulum excitation effect is good.
[0010] Furthermore, the fixing part is provided with a limiting plane, and when the rotating part is in the initial position, the bottom of the rotating end abuts against the limiting plane.
[0011] The beneficial effect of adopting the above technical solution is that the rotating part is in the initial position by limiting the first plane.
[0012] Furthermore, the fixing part is provided with a limiting inclined surface, which is located above the limiting plane; the limiting inclined surface is used to restrict the rotating body from flipping over and being unable to return to its original position.
[0013] The beneficial effect of adopting the above technical solution is that by limiting the maximum rotation angle of the rotating part through the limiting inclined surface one, when the pendulum is excited at a large angle, the limiting inclined surface one can prevent the impact generated by the hanging ring from directly bouncing the rotating body up and flipping it over so that it cannot be reset.
[0014] Furthermore, the top of the rotating end two is provided with a limiting inclined surface two. When the C-shaped hook is in the initial position, the side of the C-shaped hook away from the rotating body abuts against the limiting inclined surface two.
[0015] The beneficial effects of adopting the above technical solution are that the C-shaped hook is placed in the initial position by the limiting inclined plane two, and the pendulum is limited and locked after the pendulum provides an excitation.
[0016] Furthermore, the top of the rotating end two is provided with a limiting plane two, which is located on the side of the limiting inclined plane two facing the rotating end one; when the C-shaped hook rotates to the lowest position, the side of the C-shaped hook facing the rotating body abuts against the limiting plane two.
[0017] The beneficial effect of adopting the above technical solution is that by limiting the second limiting plane, the maximum rotation angle of the C-hook is limited, so that the lifting ring can just swing over the upper surface of the C-hook.
[0018] Furthermore, both the first and second limiting inclined surfaces are provided with rubber pads.
[0019] The beneficial effect of adopting the above technical solution is that the rubber pad can buffer the impact brought by the excitation of the pendulum.
[0020] Furthermore, the rotating body is configured as a downwardly curved arc structure.
[0021] The beneficial effect of adopting the above technical solution is that, compared with the planar structure, the arc-shaped structure can reduce the contact time between the lower surface of the rotating body and the hanging ring during the pendulum's motion.
[0022] Furthermore, a guide groove is provided at the bottom of the fixing part, and the fixing part is installed on the pendulum bracket through the guide groove.
[0023] The beneficial effect of adopting the above technical solution is that, by setting the guide groove, the device can be moved and fixed in a suitable position according to the angle of the pendulum.
[0024] Furthermore, there are two planar spiral springs, which are located at the two ends of the cylindrical pin.
[0025] The beneficial effect of adopting the above technical solution is that it facilitates the reset of the rotating part of the planar spiral spring.
[0026] Furthermore, there are two planar spiral springs, which are located at the two ends of the cylindrical pin.
[0027] The beneficial effect of adopting the above technical solution is that it facilitates the reset of the two C-shaped hooks of the planar spiral spring. Attached Figure Description
[0028] Figure 1 This is a front view of the pendulum locking structure of this utility model;
[0029] Figure 2 This is a three-dimensional structural diagram of the pendulum locking structure of this utility model.
[0030] Figure 3 This is a three-dimensional structural diagram of either the first or second planar spiral spring of this utility model.
[0031] Figure 4 This is a cross-sectional schematic diagram of the rotating part of this utility model;
[0032] Figure 5 This is a cross-sectional schematic diagram of the rotating part of this utility model;
[0033] Figure 6 This is an initial state diagram of the pendulum locking structure and the pendulum of this utility model.
[0034] Figure 7 This describes the process state of the pendulum locking structure and the pendulum in this invention. Figure 1 ;
[0035] Figure 8 This describes the process state of the pendulum locking structure and the pendulum in this invention. Figure 2 ;
[0036] Figure 9 This describes the process state of the pendulum locking structure and the pendulum in this invention. Figure 3 ;
[0037] Figure 10 This describes the process state of the pendulum locking structure and the pendulum in this invention. Figure 4 ;
[0038] Figure 11 This is a diagram showing the final state of the pendulum locking structure and the pendulum in cooperation with the present invention.
[0039] Figure 12 This is a perspective view of the pendulum locking structure of this utility model in its final state of engagement with the pendulum.
[0040] Explanation of reference numerals in the attached drawings: 1. Fixed part; 2. Rotating part; 21. Rotating main body; 22. Rotating end one; 23. Rotating end two; 3. Pendulum support; 4. Cylindrical pin one; 5. Cylindrical pin two; 6. C-hook; 7. Planar spiral spring one; 8. Planar spiral spring two; 9. Pendulum; 10. Lifting ring; 11. Limiting plane one; 12. Limiting inclined plane one; 13. Limiting inclined plane two; 14. Limiting plane two; 15. Guide groove. Detailed Implementation
[0041] The following is in conjunction with the appendix Figure 1-12 The principles and features of this utility model are described, and the examples given are only used to explain this utility model and are not intended to limit the scope of this utility model.
[0042] This utility model discloses a pendulum locking structure to prevent secondary excitation.
[0043] Reference Figures 1-12 A pendulum locking structure to prevent secondary excitation includes a fixed part 1 and a rotating part 2. The fixed part 1 is mounted on a pendulum support 3. The rotating part 2 includes a rotating body 21, a first rotating end 22, and a second rotating end 23, which are located at opposite ends of the rotating body 21. The first rotating end 22 is rotatably connected to the fixed part 1 via a first cylindrical pin 4, and the second rotating end 23 is rotatably connected to a C-shaped hook 6 via a second cylindrical pin 5. After the pendulum 9 completes its first excitation, it can be locked in place by cooperating with the C-shaped hook 6 to prevent secondary excitation.
[0044] A planar spiral spring 7 is provided between the cylindrical pin 4 and the fixed part 1. The planar spiral spring 7 is used to drive the rotating part 2 to reset. There are two planar spiral springs 7, which are located at the two ends of the cylindrical pin 4, so as to facilitate the plane spiral springs 7 to reset the rotating part 2.
[0045] A planar spiral spring 8 is provided between the cylindrical pin 25 and the rotating end 23. The planar spiral spring 8 is used to drive the C-shaped hook 6 to reset. There are two planar spiral springs 8, which are located at the two ends of the cylindrical pin 25, so as to facilitate the reset of the C-shaped hook 6 by the planar spiral springs 8.
[0046] Specifically, to install the planar spiral spring 7 and the planar spiral spring 8, countersunk holes can be made at the lower end of the fixing part 1 and the upper end of the rotating end 23. Clamping slots are also made at the pin heads of the cylindrical pins 4 and 5, as well as on the inner surfaces of the countersunk holes in the fixing part 1 and the rotating end 23, for installing the planar spiral spring 7 and the planar spiral spring 8. It should be noted that there are many existing methods for installing the planar spiral spring 7 and the planar spiral spring 8, which will not be elaborated upon here.
[0047] The upper part of the pendulum 9 is rotatably mounted on the pendulum bracket 3, and a lifting ring 10 is fixed to the top of the pendulum 9. When the pendulum 9 is excited once, the bottom of the pendulum 9 is at its lowest point, and the lifting ring 10 is disengaged from the rotating part 2. After the pendulum 9 completes one excitation, the lifting ring 10 abuts against the reset C-shaped hook 6, and the bottom of the pendulum 9 is located on the side opposite to the excitation direction at the lowest point of the first excitation, thereby preventing the pendulum 9 from being excited a second time.
[0048] The bottom of the fixing part 1 is provided with rectangular guide grooves 15 at both ends, and the fixing part 1 is installed on the pendulum bracket 3 through the guide grooves 15. By setting the guide grooves 15, the device can be moved and fixed in a suitable position according to the angle of the pendulum 9.
[0049] The lower part of the fixed part 1 has a limiting plane 11. When the rotating part 2 is in the initial position, the bottom of the rotating end 22 abuts against the limiting plane 11. The lower part of the fixed part 1 also has a limiting inclined surface 12, which is located above the limiting plane 11. The limiting inclined surface 12 is used to prevent the rotating body 21 from flipping over and failing to return to its original position, and to limit the maximum rotation angle of the rotating part 2. When the pendulum 9 is excited at a large angle, the limiting inclined surface 11 can prevent the impact generated by the hanging ring 10 from directly lifting the rotating body 21 and flipping it over, making it unable to return to its original position.
[0050] The top of the rotating end 23 has a limiting inclined surface 13. When the C-hook 6 is in its initial position, the side of the C-hook 6 facing away from the rotating body 21 abuts against the limiting inclined surface 13. The limiting inclined surface 13 ensures the C-hook 6 is in its initial position and, after the pendulum 9 provides initial excitation, limits and locks the pendulum 9. The top of the rotating end 23 also has a limiting plane 14, located on the side of the limiting inclined surface 13 facing the rotating end 22. When the C-hook 6 rotates to its lowest position, the side of the C-hook 6 facing the rotating body 21 abuts against the limiting plane 14, limiting the maximum rotation angle of the C-hook 6, allowing the lifting ring 10 to just swing over the upper surface of the C-hook 6.
[0051] Rubber pads are fixed on both the first limiting inclined surface 12 and the second limiting inclined surface 13. The rubber pads are used to buffer the impact caused by the excitation of the pendulum 9.
[0052] The rotating body 21 is configured as a downward-curved arc structure. Compared with a planar structure, the arc structure can reduce the contact time between the lower surface of the rotating body 21 and the hanging ring 10 during the movement of the pendulum 9.
[0053] Specifically, given the angle at which the pendulum 9 provides minimum excitation, the cylindrical pin 5 is fixed at an appropriate position within this angle. During the clockwise movement of the pendulum 9, a primary excitation is provided at the lowest horizontal point. The motion process of the pendulum locking structure for preventing secondary excitation is as follows:
[0054] Reference Figure 6 Before energizing, manually pull the bottom of the pendulum 9 up to an appropriate position. At this time, the top of the hanging ring 10 abuts against the arc-shaped structure at the bottom of the rotating body 21, which is the initial state of the pendulum locking structure cooperating with the pendulum 9.
[0055] Reference Figure 4 and Figure 7 Release the pendulum 9, and the pendulum 9 swings clockwise. During the swing, the hanging ring 10 lifts the arc-shaped part at the bottom of the rotating body 21, and the planar spiral springs 7 at both ends of the cylindrical pin 4 are gradually compressed. The rotating part 2 gradually rotates to the highest position, the rotation angle is the largest, and the planar spiral springs 7 are compressed to the tightest.
[0056] Reference Figure 4 and Figure 8 When the pendulum 9 reaches the lowest horizontal point, it provides an excitation. The hanging ring 10 no longer contacts the arc-shaped part at the bottom of the rotating body 21. The planar spiral spring 7 releases its elastic potential energy and performs the reset movement of the rotating part 2. It remains in the initial position under the limit of the upper limit plane 11 of the fixed part 1.
[0057] Reference Figure 5 and Figure 9 Due to the conservation of momentum, after the pendulum 9 is given an initial excitation, it moves counterclockwise in the horizontal position. The ring 10 contacts the surface of the C-hook 6 and presses down on the C-hook 6, gradually compressing the planar spiral springs 8 at both ends of the cylindrical pin 25. When the C-hook 6 abuts against the limiting plane 14 on the side facing the rotating body 21, the C-hook 6 rotates to its lowest position with the maximum rotation angle, and the planar spiral springs 8 are compressed to their tightest point, allowing the ring 10 to just swing over the upper surface of the C-hook 6.
[0058] Reference Figure 5 and Figure 10 The pendulum 9 continues its counterclockwise motion, the ring 10 separates from the C-hook 6, and the planar spiral spring 8 releases its elastic potential energy to reset the C-hook 6. Due to the conservation of energy, the pendulum 9 begins to swing clockwise after reaching its maximum angle in the counterclockwise motion, and the C-hook 6 remains in its initial position under the limit of the upper limit inclined plane 13 at the rotating end 23.
[0059] Reference Figure 5 , Figure 11 and Figure 12The pendulum 9 swings clockwise until the ring 10 contacts the inner surface of the reset C-hook 6 (the side facing the rotating body 21). Due to the limiting slope 13, the pendulum 9 is constrained to the right of the lowest horizontal point that provides the first excitation (the side away from the excitation direction), preventing the pendulum 9 from providing a second excitation. This is the end state of the pendulum locking structure cooperating with the pendulum 9.
[0060] 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, improvements, etc., 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 locking structure for preventing secondary excitation, characterized by: The utility model provides a kind of pendulum mechanism, including fixed part (1) and rotating part (2), the fixed part (1) is mounted on pendulum support (3), the rotating part (2) includes rotating main body (21), rotating end one (22) and rotating end two (23), rotating end one (22) and rotating end two (23) are located at both ends of rotating main body (21) respectively;Rotating end one (22) is rotatably connected with fixed part (1) by cylindrical pin one (4), and rotating end two (23) is rotatably connected with C type hook (6) by cylindrical pin two (5);Plane spiral spring one (7) is equipped between cylindrical pin one (4) and fixed part (1), and plane spiral spring one (7) is used to drive rotating part (2) reset;Plane spiral spring two (8) is equipped between cylindrical pin two (5) and rotating end two (23), and plane spiral spring two (8) is used to drive C type hook (6) reset;The upper part of pendulum (9) is rotatably installed on pendulum support (3), and the top of pendulum (9) is fixed with lifting ring (10);When pendulum (9) is excited for the first time, the bottom of pendulum (9) is at the lowest point, and lifting ring (10) is separated from rotating part (2);After pendulum (9) completes once excitation, lifting ring (10) is abutted with reset C type hook (6), and the bottom of pendulum (9) is at the lowest point of once excitation and is away from the side of excitation direction.
2. The pendulum locking structure for preventing secondary excitation according to claim 1, characterized in that: The fixed part (1) is provided with a limiting plane one (11), and the bottom of the rotating end one (22) is abutted with the limiting plane one (11) when the rotating part (2) is in the initial position.
3. The pendulum locking structure for preventing secondary excitation according to claim 2, characterized in that: The fixed part (1) is provided with a limiting inclined plane one (12), and the limiting inclined plane one (12) is located at the upper part of the limiting plane one (11); the limiting inclined plane one (12) is used to limit the rotating main body (21) from turning over and resetting.
4. The pendulum locking structure for preventing secondary excitation according to claim 3, characterized in that: The top of the rotating end two (23) is provided with a limiting inclined plane two (13), and the side of the C type hook (6) away from the rotating main body (21) is abutted with the limiting inclined plane two (13) when the C type hook (6) is in the initial position.
5. The pendulum lock structure for preventing secondary excitation according to claim 4, characterized in that: The top of the rotating end two (23) is provided with a limiting plane two (14), and the limiting plane two (14) is located at the side of the limiting inclined plane two (13) towards the rotating end one (22); the side of the C type hook (6) towards the rotating main body (21) is abutted with the limiting plane two (14) when the C type hook (6) rotates to the lowest position.
6. The pendulum locking structure for preventing secondary excitation according to claim 5, characterized in that: Rubber pads are provided on the limiting inclined plane one (12) and the limiting inclined plane two (13).
7. The pendulum lock structure for preventing secondary excitation according to claim 1, wherein: The rotating main body (21) is arranged as an arc structure bending downward.
8. The pendulum lock structure for preventing secondary excitation according to claim 1, characterized in that: The bottom of the fixed part (1) is provided with a guide groove (15), and the fixed part (1) is installed on the pendulum support (3) through the guide groove (15).
9. The pendulum lock structure for preventing secondary excitation according to claim 1, wherein: The plane spiral spring one (7) is provided with two, and the two plane spiral spring ones (7) are respectively located at both ends of the cylindrical pin one (4).
10. The pendulum lock structure for preventing secondary excitation according to claim 1, characterized in that: The plane spiral spring two (8) is provided with two, and the two plane spiral spring twos (8) are respectively located at both ends of the cylindrical pin two (5).