CN-116809362-B - Small inertial vibration exciter

CN116809362BCN 116809362 BCN116809362 BCN 116809362BCN-116809362-B

Abstract

The application discloses a small inertial vibration exciter, which comprises a movable part, a fixed connection part and a supporting part, wherein the fixed connection part is positioned above the movable part and is connected with each other through the supporting part, the supporting part is provided with a coil, a magnet is arranged in the fixed connection part, a reed is arranged in the movable part, the coil moves under the action of current and drives the reed to displace, and the reed is transmitted to the outside through an inner stud and an outer stud of the fixed connection part. The small inertial vibration exciter can output the requirement of larger inertial force at low frequency, medium frequency and low frequency.

Inventors

ZHENG RONGHUI
WEI JIANGNAN
CHEN HUAIHAI

Assignees

南京航空航天大学

Dates

Publication Date: 20260505
Application Date: 20230627

Claims (2)

1. The small inertia vibration exciter is characterized by comprising a movable part, a fixed connection part and a supporting part, wherein the fixed connection part is positioned above the movable part and is connected with each other through the supporting part, the supporting part is provided with a coil, a magnet is arranged in the fixed connection part, a reed is arranged in the movable part, the coil moves under the action of current and drives the reed to displace, and the reed is transmitted to the outside through an inner stud and an outer stud of the fixed connection part; The support part comprises a movable coil framework (6), reeds and a stud (8), wherein the reeds comprise a first reed and a second reed, the movable coil framework is positioned above a magnetic gap inner ring (3), a coil is wound on the movable coil framework (6) and is always ensured to completely cover the magnetic gap inner ring (3) in the up-down motion process, the middle part of the stud (8) is provided with external threads, the upper end and the lower end of the stud are respectively provided with external threads, the lower end external threads of the stud penetrate through a central through hole of the first reed (7) and are matched with the central screw hole of the movable coil framework (6), the middle part of the stud (8) is larger than the diameter of the upper end surface of the movable coil framework (6) and is used for compressing the first reed (7) on the upper end of the movable coil framework (6), the periphery of the first reed (7) is compressed by an upper compression ring and a lower compression ring and is penetrated by an upper connection screw and a lower compression ring so as to limit the axial rotation and radial movement of the first reed (7 ') is penetrated by the upper end external threads of the stud (8), the second reed (7') is penetrated by the upper end external threads of the stud (8), and the second reed (7 ') is placed on the middle part and is not threaded by the upper surface of the stud (7') and is compressed by the compression ring and the compression ring; The fixed connection part comprises a force ring support (9), a force sensor (10), an inner stud (11) and a top cover (12), wherein the outer diameters of two ends of the force ring support (9) are different, the small diameter end faces downwards, the large diameter end faces upwards, a through hole is formed in the force ring support and is used for being placed on the upper surface of a second reed (7') through the upper end part of the stud (8), the force sensor (10) is placed on the large diameter end of the force ring support (9), the inner thread part of the inner stud (11) is matched with the outer thread part of the upper end of the stud (8) to achieve the purpose of pre-tightening the force sensor, and the top cover (12) is screwed on the outer thread part of the inner stud (11).
2. The small inertial vibration exciter according to claim 1, wherein the movable part comprises a base (1), a magnet (2), a magnetic gap inner ring (3), a lower pressing ring (4) and an upper pressing ring (5), wherein the magnet (2) and the magnetic gap inner ring (3) are stacked up and down and fixedly connected to the base through a central screw hole, the lower pressing ring (4) is connected with the screw hole in the base (1) through a screw, and the upper pressing ring (5) is connected with the screw hole in the lower pressing ring (4) through a screw penetrating through a through hole.

Description

Small inertial vibration exciter Technical Field The invention discloses a small inertial vibration exciter, and belongs to the technical field of mechanical vibration environment tests. Background Mechanical devices are often subjected to complex dynamic environments during transportation or use, which can have an impact on their reliability and life. In order to simulate the complex force actually applied to the structure, a mechanical environment test is performed, so that the method for verifying the reliability of the structure is the most effective and direct method. In mechanical environment testing, for small structures, vibration exciters are often used as a source of force. Conventional electromagnetic vibration exciters generally require fixed mounting, however, for some locations of the structure where the fixed mounting conditions are not present, additional lifting is required. Furthermore, electromagnetic exciters cannot even be installed to apply effective excitation for certain excitation points in small spaces. The small inertial vibration exciter adopts the inertial force of the movable part as the excitation applied on the structure, can be directly mounted on the surface of the structure in a bonding or screwing mode, has small size and low requirement on the mounting position. Disclosure of Invention Aiming at the technical problems, the application aims to provide a small inertial vibration exciter which can output larger inertial force at low frequency and medium-low frequency. The invention relates to a small inertial vibration exciter, which comprises a movable part, a fixed connection part and a supporting part, wherein the fixed connection part is positioned above the movable part and is connected with each other through the supporting part, the supporting part is provided with a coil, a magnet is arranged in the fixed connection part, a reed is arranged in the movable part, the coil moves under the action of current, and drives the reed to displace, and the reed is transmitted to the outside through an inner stud and an outer stud of the fixed connection part. Further, the movable part comprises a base 1, a magnet 2, a magnetic gap inner ring 3, a lower pressing ring 4 and an upper pressing ring 5, wherein the magnet 2 and the magnetic gap inner ring 3 are stacked up and down and fixedly connected to the base through a central screw hole, the lower pressing ring 4 is connected with the screw hole on the base 1 through a screw, and the upper pressing ring 5 is connected with the screw hole on the lower pressing ring 4 through the screw passing through the through hole. Further, the supporting part comprises a movable coil framework 6, reeds and a double-end stud 8, wherein the reeds comprise a first reed and a second reed, the movable coil framework is located above the magnetic gap inner ring 3, a coil is wound on the movable coil framework 6 and always ensures to completely cover the magnetic gap inner ring 3 in the up-down movement process, the middle part of the double-end stud 8 is unthreaded, the upper end and the lower end of the double-end stud 8 are respectively provided with external threads, the lower end external thread part of the double-end stud passes through a central through hole of the first reed 7 and is matched with a central screw hole of the movable coil framework 6, the middle unthreaded part of the double-end stud 8 is larger than the diameter of the upper end face of the movable coil framework 6 and is used for compressing the first reed 7 on the upper end of the movable coil framework 6, the periphery of the first reed 7 is compressed by an upper compression ring and a lower compression ring and is penetrated by a connecting screw of the upper compression ring and the lower compression ring so as to limit the axial rotation and radial movement of the first reed 7' passes through the external thread part of the upper end of the double-end stud 8 and is placed on the upper surface of the middle unthreaded part of the double-end stud 8. Further, the fixed connection part comprises a force ring support 9, a force sensor 10, an inner stud 11, an outer stud 11 and a top cover 12, wherein the outer diameters of two ends of the force ring support 9 are different, the small diameter end faces downwards, the large diameter end faces upwards, a through hole is formed in the force ring support for being placed on the upper surface of the second reed 7' through the upper end part of the stud 8, the force sensor 10 is placed on the large diameter end of the force ring support 9, the inner thread part of the inner stud 11 and the outer thread part of the outer stud 11 are matched with the outer thread part of the upper end of the stud 8 to achieve the purpose of pre-tightening the force sensor, and the top cover 12 is screwed on the outer thread part of the inner stud 11. Advantageous effects (1) The invention obviously reduces the distance between the base and the inn