Vibration isolator for vibration isolation of sensor

Abstract

The vibration isolator is installed between a carrier and a sensor and comprises an upper metal piece, a lower metal piece and an installation base which are sequentially connected from top to bottom, the top of the upper metal piece is connected with a screw, the screw is connected with the sensor, and a rubber element is arranged between the lower metal piece and the installation base. Compared with the prior art, through the metal-rubber-metal sandwich structure in the longitudinal direction and the rubber-metal-rubber sandwich structure in the transverse direction, the bearing capacity of the vibration isolator in the longitudinal direction and the transverse direction can be improved on the basis that good vibration isolation performance is guaranteed; the transverse swing of the vibration isolator under the dynamic load of the vehicle and the deformation of the vibration isolator under transverse and longitudinal impact excitation generated when the vehicle is started and stopped are reduced, and the service life of the vibration isolator is prolonged. In addition, the vibration isolator is simple in structure, the upper metal piece and the lower metal piece are detachable, and installation and replacement are convenient.

Description

Technical Field

[0001] The invention relates to the technical field of sensor vibration isolation, and in particular to a vibration isolator used for sensor vibration isolation. Background Art

[0002] Sensors are used to measure key data on many vehicles in the aerospace and navigation fields, but these sensors are often affected by the vehicle's own vibration, resulting in measurement errors. The vehicle will generate dynamic displacement excitation during operation. When the vehicle starts or stops, it will also generate lateral or longitudinal impact excitation, causing lateral or longitudinal vibration; in addition, factors such as the operation of the vehicle's internal equipment and external airflow can also cause vibration. These vibrations are transmitted to the sensors carried by the structure, which may distort the sensor's measurement signal and lead to erroneous data analysis. Especially in applications with high precision requirements, small errors will affect the function of the overall system.

[0003] In this context, sensor vibration isolation is particularly important. Vibration isolators can effectively reduce the vibration energy transmitted to the sensor and reduce the sensor's measurement error of the target signal, thereby improving data reliability and the dynamic stability of the system to ensure mission success.

[0004] Rubber isolators have become a widely used solution in various vibration isolation systems due to their simple structure, good durability, reliability and low-frequency vibration isolation effect. However, in the field of vehicles, the application effect of simple rubber isolators is not satisfactory. This is because in order to improve the low-frequency vibration isolation effect of the isolator and avoid resonance, the natural frequency of the vibration isolation system must be as low as possible, which requires reducing the stiffness of the isolator. However, when facing the dynamic load of the vehicle and the impact excitation generated during start-up and shutdown, the lower-stiffness isolator may produce large deformation or even damage, resulting in system instability. Therefore, it is of great significance to improve the bearing capacity of the isolator and reduce its deformation under dynamic load while ensuring the vibration isolation effect of the isolator.

[0005] A Chinese patent application with publication date of November 27, 2020 and publication number CN110486405B discloses a vibration isolation system with annular metal rubber isolators for precision loads. The vibration isolation system includes multiple annular metal rubber isolators, a base and a load platform, wherein the annular metal rubber isolators are evenly distributed between the base and the load platform. The vibration isolation system utilizes the characteristics of small radial stiffness and large axial stiffness of cylindrical metal rubber to improve the lateral bearing capacity of the vibration isolation system. However, since the dynamic load and impact excitation of the carrier may exist in multiple directions such as the lateral and longitudinal directions, the vibration isolation system will still produce large deformations when subjected to impact excitations in other directions. Summary of the invention

[0006] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a vibration isolator for sensor vibration isolation, which can be suitable for vibration isolation of precision instruments such as sensors on various types of carriers and improve the lateral and longitudinal bearing capacity.

[0007] The objective of the present invention can be achieved through the following technical solution: a vibration isolator for sensor vibration isolation, installed between a carrier and a sensor, comprising an upper metal part, a lower metal part and a mounting base connected in sequence from top to bottom, a screw connected to the top of the upper metal part, the screw being connected to the sensor, and a rubber element being arranged between the lower metal part and the mounting base.

[0008] Furthermore, an opening for inverted insertion of screws is provided on the top of the upper metal component, and the bottom boss of the upper metal component is hollow inside to reserve space for inverted installation of the screws.

[0009] Furthermore, the bottom boss of the upper metal component is screwed to the lower metal component via a thread.

[0010] Furthermore, an outer side of the bottom boss of the upper metal part is processed with an external thread, the top of the lower metal part is a concave structure, and an inner wall of the concave structure is processed with an internal thread.

[0011] Furthermore, the outer walls of the upper metal part and the lower metal part are cut with wrench flats for achieving transverse and longitudinal locking.

[0012] Furthermore, the bottom boss of the lower metal component passes through the rubber element and then is embedded in the mounting base.

[0013] Furthermore, a rubber element extends from the lower end of the bottom boss of the lower metal component, and a lateral gap exists between the rubber element and the mounting base.

[0014] Furthermore, the middle of the rubber element is hollowed out, the top of the rubber element contacts the bottom of the lower metal component, and the bottom of the rubber element contacts the upper surface of the mounting base.

[0015] Furthermore, the lower metal part, the rubber element and the mounting base are vulcanized into one body.

[0016] Furthermore, the contact positions between the rubber element, the lower metal part and the mounting base are all processed with arc edges.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] The present invention is designed to have an upper metal part, a lower metal part and a mounting base connected in sequence from top to bottom, and a rubber element is arranged between the lower metal part and the mounting base to realize a longitudinal metal-rubber-metal sandwich structure. The design utilizes the elastic deformation and energy dissipation characteristics of the rubber element to achieve good vibration isolation performance, while improving the longitudinal bearing capacity of the vibration isolator and reducing its deformation under the longitudinal impact excitation generated by the dynamic load of the carrier and during start-stop.

[0019] The present invention has a screw connected to the top of the upper metal part, the screw is connected to the sensor, and the screw is inserted into the opening of the upper metal part from bottom to top to fix the vibration-isolated sensor on the top of the upper metal part. After the vibration-isolated sensor is installed, the upper metal part and the lower metal part are screwed together through internal and external threads, and horizontal and vertical locking is achieved through the wrench plane. The design has a simple structure, flexible composition, and convenient installation. The upper and lower parts are detachable, and when replacing the sensor, only the upper metal part and the screw need to be disassembled.

[0020] The rubber element of the present invention is designed to be hollow in the middle, and the boss of the lower metal part is inserted into the rubber element and contacts a part of the inner surface of the rubber element, thus realizing a rubber-metal-rubber sandwich structure in the lateral direction and increasing the lateral bending stiffness of the isolator. This design improves the lateral load-bearing capacity of the isolator, can prevent the isolator from having a large lateral swing under the dynamic load of the carrier, and improves the dynamic stability of the system. When the isolator is installed horizontally and the mass of the object to be isolated is large, the structure can also play a certain supporting role. In addition, the rubber element extends from the lower end of the boss of the lower metal part, but a certain lateral gap is retained between the rubber element and the mounting base. When facing the lateral impact excitation caused by the start and stop of the carrier, this structure can play a limiting role, preventing the rubber element from reducing its service life or even causing damage due to rapid compression.

[0021] The present invention provides arc edging at the contact points between the rubber element, the lower metal part and the mounting base, which can effectively reduce the risk of debonding during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A three-dimensional view of the present invention;

[0023] Figure 2 It is a cross-sectional schematic diagram of the present invention;

[0024] Description of marks in the figure: 1, screw 2, upper metal part 3, lower metal part 4, rubber element 5, mounting base. DETAILED DESCRIPTION

[0025] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Example

[0027] like Figure 1 and Figure 2 As shown, a vibration isolator suitable for precision instruments such as sensors and taking into account both lateral and longitudinal bearing capacity comprises a screw 1, an upper metal part 2, a lower metal part 3, a rubber element 4 and a mounting base 5; wherein an opening is reserved at the top of the upper metal part 2, and the center of the boss at the bottom of the upper metal part 2 is hollowed out to reserve a space for the screw 1 to be installed upside down; the screw 1 penetrates into the hole of the upper metal part 2 from bottom to top, and the lower surface of the screw 1 contacts the upper surface of the hollowed-out boss of the upper metal part 2, thereby connecting and fixing the sensor to the top platform of the upper metal part 2;

[0028] The upper metal part 2 and the lower metal part 3 are screwed together by threads, the outer side of the boss at the bottom of the upper metal part 2 is processed with external threads, the top of the lower metal part 3 is hollowed out, and the inside is processed with internal threads. In addition, the upper metal part 2 and the lower metal part 3 are both cut with wrench flats; the bottom of the upper metal part 2 and the top of the lower metal part 3 are screwed together by internal and external threads, and the wrench flats are used to achieve horizontal and vertical locking. The design has a simple structure, flexible composition, and convenient installation. The upper and lower parts are detachable. When replacing the sensor, only the upper metal part 2 and the screw 1 need to be disassembled;

[0029] The diameter of the bottom boss of the lower metal part 3 is smaller than the diameter of the top platform thereof, the middle of the rubber element 4 is hollowed out, the boss of the lower metal part 3 is inserted therein, and contacts a part of the inner surface of the rubber element 4, the top of the rubber element 4 contacts the bottom of the lower metal part 3, a part of the middle inner surface of the rubber element 4 contacts the boss of the lower metal part 3, and the bottom of the rubber element 4 contacts the upper surface of the mounting base 5, thus realizing a lateral rubber-metal-rubber sandwich structure, increasing the lateral bending stiffness of the vibration isolator. This design improves the lateral bearing capacity of the vibration isolator, can prevent the vibration isolator from having a large lateral swing under the dynamic load of the carrier, and improves the dynamic stability of the system. When the vibration isolator is installed horizontally and the mass of the object to be isolated is large, this structure can also play a certain supporting role;

[0030] The rubber element 4 is vulcanized together with the lower metal part 3 and the mounting base 5. The upper surface of the rubber element 4 is vulcanized together with the bottom of the lower metal part 3, and the lower surface is vulcanized together with the upper surface of the mounting base 5, thus realizing a metal-rubber-metal sandwich structure in the longitudinal direction. This design utilizes the elastic deformation and energy dissipation characteristics of the rubber element 4 to realize good vibration isolation performance, while improving the longitudinal bearing capacity of the vibration isolator and reducing its deformation under the longitudinal impact excitation generated by the dynamic load of the carrier and during start-stop.

[0031] The contact points between the rubber element 4, the lower metal part 3 and the mounting base 5 are all processed with arc edges, which further reduces the risk of debonding during use;

[0032] In this embodiment, the rubber element 4 is made of chloroprene rubber, and the Shore hardness is between 60-65;

[0033] In addition, a rubber element 4 extends from the lower end of the boss at the bottom of the lower metal part 3, and there is a certain lateral gap between the rubber element 4 and the mounting base 5. This design can play a limiting role when facing the lateral impact excitation caused by the start and stop of the vehicle, preventing the rubber element 4 from reducing its service life or even causing damage due to rapid compression;

[0034] The bottom of the mounting base 5 is provided with an opening which is in center contact with the corresponding mounting position on the carrier.

[0035] By applying this scheme in practice, the above-mentioned vibration isolator is installed between the carrier and the sensor, which can isolate the vibration caused by the dynamic load of the carrier and the lateral and longitudinal impact excitation generated during starting and stopping, and has good lateral and longitudinal bearing capacity.

Claims

1. A vibration isolator for sensor vibration isolation, characterized in that: The device is installed between a carrier and a sensor, and comprises an upper metal part (2), a lower metal part (3) and a mounting base (5) which are connected in sequence from top to bottom, wherein a screw (1) is connected to the top of the upper metal part (2), and the screw (1) is connected to the sensor, and a rubber element (4) is arranged between the lower metal part (3) and the mounting base (5).

2. A vibration isolator for sensor vibration isolation according to claim 1, characterized in that: The top of the upper metal part (2) is provided with an opening for inverted insertion of the screw (1), and the bottom boss of the upper metal part (2) is hollow inside to reserve space for inverted installation of the screw (1).

3. The vibration isolator for sensor vibration isolation according to claim 1, characterized in that: The bottom boss of the upper metal part (2) is screwed to the lower metal part (3) via threads.

4. The vibration isolator for sensor vibration isolation according to claim 3, characterized in that: The outer side of the bottom boss of the upper metal part (2) is processed with an external thread, the top of the lower metal part (3) is a concave structure, and the inner wall of the concave structure is processed with an internal thread.

5. The vibration isolator for sensor vibration isolation according to claim 4, characterized in that: The outer walls of the upper metal part (2) and the lower metal part (3) are both cut with wrench flat surfaces for achieving transverse and longitudinal locking.

6. The vibration isolator for sensor vibration isolation according to claim 1, characterized in that: The bottom boss of the lower metal part (3) passes through the rubber element (4) and is embedded in the mounting base (5).

7. The vibration isolator for sensor vibration isolation according to claim 6, characterized in that: The rubber element (4) extends out from the lower end of the bottom boss of the lower metal component (3), and there is a lateral gap between the rubber element (4) and the mounting base (5).

8. The vibration isolator for sensor vibration isolation according to claim 6, characterized in that: The middle of the rubber element (4) is hollowed out, the top of the rubber element (4) contacts the bottom of the lower metal component (3), and the bottom of the rubber element (4) contacts the upper surface of the mounting base (5).

9. The vibration isolator for sensor vibration isolation according to claim 8, characterized in that: The lower metal part (3), the rubber element (4) and the mounting base (5) are vulcanized into one body.

10. The vibration isolator for sensor vibration isolation according to claim 8, characterized in that: The contact positions between the rubber element (4), the lower metal part (3) and the mounting base (5) are all processed with circular arc edges.

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