Frequency modulation damper

Abstract

The utility model discloses a frequency modulation damper which comprises a bolt, an end plate I, a rubber block I, a vibrating body, a rubber block II and an end plate II, wherein the center of the end plate I is provided with a mounting hole; the end plate I, the rubber block I, the vibrating body, the rubber block II and the end plate II are sequentially mounted on a screw rod of the bolt in series through the mounting hole; an installation hole of the first end plate is a first threaded hole, a threaded rod of the bolt is screwed into the first threaded hole of the first end plate through an external thread, the first rubber block, the vibrating body, the second rubber block and the second end plate can slide on the threaded rod of the bolt, the second end plate is pressed by a bolt handle of the bolt by rotating the bolt, and the first rubber block and the second rubber block are pre-compressed. During application, the pre-compression amount of the first rubber block and the second rubber block is adjusted by changing the distance between the first end plate and the second end plate. The frequency modulation damper has the advantages that mass blocks do not need to be added or reduced on the vibrating body, frequency adjustment of the frequency modulation damper can be achieved only by twisting the bolt or the bolt sleeve, cost is saved, and too large space does not need to be occupied; the structure is simple and operation is convenient.

Description

Technical Field

[0001] The utility model relates to a frequency modulation damper and belongs to the technical field of vibration reduction equipment. Background Art

[0002] The frequency-tuned mass damper is composed of a mass block, a spring and a damping system. Its working principle is to fix the frequency-tuned mass damper near the maximum amplitude position of the main structure, and adjust the vibration frequency of the frequency-tuned mass damper to be the same or close to the vibration frequency of the main structure. When the main structure vibrates, the frequency-tuned mass damper is stimulated to resonate, and the vibration energy is consumed by the damping system of the frequency-tuned mass damper to reduce the vibration of the main structure.

[0003] Conventional frequency-tuned mass dampers used for vibration reduction of certain equipment usually adjust the natural frequency of the frequency-tuned mass damper by adding a mass block (hanging an object of a certain weight on the vibrating body). However, this method requires the preparation of a mass block, which not only increases the cost, but also increases the weight and volume of the damper after the mass block is added, which increases the difficulty of practical application for the main structure with limited load and space. Utility Model Content

[0004] The technical problem to be solved by the utility model is: how to adjust the natural frequency of the damper in a large range without adding a mass block.

[0005] The utility model adjusts the natural frequency by adjusting the stiffness of the rubber spring, and utilizes the nonlinear characteristics of the stiffness of the rubber spring, which can achieve a wide range of stiffness adjustment, and further adjust the natural frequency in a wide range. In view of the above problems, the technical solution proposed by the utility model is:

[0006] A frequency modulation damper comprises a bolt, and an end plate 1, a rubber block 1, a vibrating body, a rubber block 2, and an end plate 2 which are sequentially mounted on the screw rod of the bolt through the mounting hole, the mounting hole of the end plate 1 being a threaded hole 1, the screw rod of the bolt being screwed into the threaded hole 1 of the end plate 1 through an external thread, the rubber block 1, the vibrating body, the rubber block 2, and the end plate 2 being able to slide on the screw rod of the bolt, the bolt shank of the bolt pressing the end plate 2 by rotating the bolt, and the rubber block 1 and the rubber block 2 being in pre-compression, and the pre-compression amount of the rubber block 1 and the rubber block 2 being adjusted by changing the distance between the end plate 1 and the end plate 2 during use.

[0007] The above-mentioned frequency-modulated damper also includes a bolt sleeve, which includes a bolt sleeve shank with a hexagonal edge and a bolt sleeve body with an external thread. The bolt sleeve body has a non-threaded through hole for the screw rod of the bolt to pass through. The mounting hole of the second end plate is a second threaded hole. The bolt sleeve is screwed into the second threaded hole of the second end plate through the external thread of the bolt sleeve body. The screw rod of the bolt is located in the non-threaded through hole of the bolt sleeve body and can slide in the non-threaded through hole. The bolt shank of the bolt is pressed on the bolt sleeve shank on the outer periphery of the non-threaded through hole, and the bolt sleeve can rotate relative to the bolt.

[0008] The frequency modulation damper also includes a bolt sleeve and a sleeve sleeved between the inner wall of the mounting hole of the vibration body and the outer periphery of the screw rod of the bolt for limiting the maximum rigidity and strengthening the force on the screw rod.

[0009] A gasket is arranged under the bolt shank of the bolt. Beneficial Effects

[0010] 1. No need to add or subtract mass blocks on the vibrating body, the frequency of the frequency modulated damper can be adjusted by twisting the bolts or bolt sleeves, which saves costs and does not take up too much space;

[0011] 2. Simple structure and easy operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a cross-sectional schematic diagram of the frequency modulation damper described in Example 1;

[0013] Figure 2 This is a schematic diagram of the assembly relationship between the end plate 1 and the bolts described in the first embodiment;

[0014] Figure 3 It is a cross-sectional schematic diagram of the frequency modulation damper described in the second embodiment;

[0015] Figure 4 This is a schematic diagram of the assembly relationship between the end plate 1, the end plate 2, the bolt sleeve and the bolts described in the second embodiment.

[0016] In the figure: 1, bolt; 101, screw; 102, bolt handle; 2, end plate one; 201, threaded hole one; 3, rubber block one; 4, vibrating body; 5, rubber block two; 6, end plate two; 601, threaded hole two; 7, bolt sleeve; 701, bolt sleeve handle; 702, bolt sleeve body; 703, external thread; 704, plain through hole; 8, sleeve; 9, gasket. DETAILED DESCRIPTION

[0017] The utility model is further described below in conjunction with the accompanying drawings. Embodiment 1

[0018] like Figure 1 , 2As shown, a frequency modulation damper includes a bolt 1, and an end plate 2, a rubber block 3, a vibrating body 4, a rubber block 5, and an end plate 6 which are sequentially mounted on a screw rod 101 of the bolt 1 through the mounting hole; the mounting hole of the end plate 2 is a threaded hole 201, and the screw rod 101 of the bolt 1 is screwed into the threaded hole 201 of the end plate 2 through an external thread, and the rubber block 3, the vibrating body 4, the rubber block 5, and the end plate 6 can slide on the screw rod 101 of the bolt 1 The bolt 1 is rotated so that the bolt handle 102 of the bolt 1 presses the end plate 2 6, and the rubber block 1 3 and the rubber block 2 5 are in pre-compression. When used, the pre-compression amount of the rubber block 1 3 and the rubber block 2 5 is adjusted by changing the distance between the end plate 1 2 and the end plate 2 6, so as to increase and decrease the stiffness of the rubber block 1 3 and the rubber block 2 5. When the stiffness increases, the vibration frequency of the damper increases, and when the stiffness decreases, the vibration frequency of the damper decreases, thereby realizing the adjustment of the damper frequency.

[0019] Furthermore, the frequency modulation damper also includes a sleeve 8 which is sleeved between the inner wall of the mounting hole of the vibration body 4 and the outer periphery of the screw rod 101 of the bolt 1 for limiting the maximum rigidity and strengthening the force of the screw rod 101. When used, the screw rod 101 can withstand the vibration of the large-mass vibration body, and at the same time, it can prevent the bolt 1 from being fed too much during assembly, resulting in an excessively high frequency of the frequency modulation damper.

[0020] A washer 9 is provided below the bolt shank 102 of the bolt 1 .

[0021] In this embodiment, the pre-compression amount of the rubber block 1 3 and the rubber block 2 5 can be adjusted by rotating the bolt 1 . Embodiment 2

[0022] like Figure 3 , 4 As shown, the difference between the embodiment 1 and the embodiment 1 is that the damper further comprises a bolt sleeve 7, the bolt sleeve 7 comprises a bolt sleeve handle 701 with a hexagonal edge and a bolt sleeve body 702 with an external thread 703, the bolt sleeve body 702 has a non-threaded through hole 704 for the screw rod 101 of the bolt 1 to pass through, the mounting hole of the end plate 2 6 is a threaded hole 2 601, the bolt sleeve 7 is screwed into the threaded hole 2 601 of the end plate 2 6 through the external thread 703 of the bolt sleeve body 702, the screw rod 101 of the bolt 1 is located in the non-threaded through hole 704 of the bolt sleeve body 702 and can slide in the non-threaded through hole 704, the bolt shank 102 of the bolt 1 is pressed on the bolt sleeve handle 701 on the periphery of the non-threaded through hole 704, and the bolt sleeve 7 can rotate relative to the bolt 1. Since there are many parts assembled on the bolt 1 and the rotation resistance is large, in this arrangement, when adjusting the pre-compression amount of the rubber block 1 3 and the rubber block 2 5, it is not necessary to rotate the bolt 1, but only the bolt sleeve 7 can be rotated.

[0023] The above embodiments are only used to more clearly describe the present invention and cannot be regarded as limiting the protection scope of the present invention. Any modifications in equivalent forms should be regarded as falling within the protection scope of the present invention.

Claims

1. A frequency modulated damper, comprising a bolt (1), and an end plate (2) having a mounting hole at the center and sequentially mounted on a screw rod (101) of the bolt (1) through the mounting hole, a rubber block (3), a vibrating body (4), a rubber block (5), and an end plate (6), characterized in that: The mounting hole of the end plate 1 (2) is a threaded hole 1 (201). The screw rod (101) of the bolt (1) is screwed into the threaded hole 1 (201) of the end plate 1 (2) through an external thread. The rubber block 1 (3), the vibrating body (4), the rubber block 2 (5) and the end plate 2 (6) can slide on the screw rod (101) of the bolt (1). By rotating the bolt (1), the bolt shank (102) of the bolt (1) presses the end plate 2 (6) and puts the rubber block 1 (3) and the rubber block 2 (5) in a pre-compression state. When in use, the pre-compression amount of the rubber block 1 (3) and the rubber block 2 (5) is adjusted by changing the distance between the end plate 1 (2) and the end plate 2 (6).

2. The frequency modulated damper according to claim 1, characterized in that: It also comprises a bolt sleeve (7), the bolt sleeve (7) comprising a bolt sleeve shank (701) with a hexagonal edge and a bolt sleeve body (702) having an external thread (703), the bolt sleeve body (702) having a threadless through hole (704) for the screw rod (101) of the bolt (1) to pass through, the mounting hole of the second end plate (6) being the second threaded hole (601), the bolt sleeve (7) being screwed into the second threaded hole (601) of the second end plate (6) through the external thread (703) of the bolt sleeve body (702), the screw rod (101) of the bolt (1) being located in the threadless through hole (704) of the bolt sleeve body (702) and being able to slide in the threadless through hole (704), the bolt shank (102) of the bolt (1) being pressed against the bolt sleeve shank (701) at the periphery of the threadless through hole (704), and the bolt sleeve (7) being able to rotate relative to the bolt (1).

3. The frequency modulated damper according to claim 1 or 2, characterized in that: It also includes a sleeve (8) sleeved between the inner wall of the mounting hole of the vibrating body (4) and the outer periphery of the screw rod (101) of the bolt (1) for limiting the maximum rigidity and strengthening the force on the screw rod (101).

4. The frequency modulated damper according to claim 2, characterized in that: A gasket (9) is provided below the bolt shank (102) of the bolt (1).

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