Integrated torsion type negative stiffness module

Abstract

The invention relates to an integrated torsion type negative stiffness module, and belongs to the technical field of structural vibration control. Comprising a shell, a sealing cover plate, a pre-compression spring, a telescopic guide rod, a torsion connecting piece, a spline connecting sleeve, a connecting port, a flat key and a spline transmission shaft. A spline is arranged in the middle of the interior of the shell and comprises an internal spline transmission shaft and a spline connecting sleeve, and a connecting port is further formed in the outer wall of the spline connecting sleeve; a pre-pressing telescopic device is connected between the connecting port and each corner of the shell; the upper portions and the lower portions of the integrated torsion type negative stiffness modules can achieve Lego-like type plug pin connection, the integrated torsion type negative stiffness modules can be generated and prefabricated in a factory in batches, and high performance and customization of the negative stiffness performance of the damping device are achieved by adjusting the number of the integrated torsion type negative stiffness modules. Diversification and structure differentiation of operation objects can be effectively dealt with, and meanwhile the product performance quality and the standardization process of damping products or related application devices are effectively improved.

Description

Technical Field

[0001] The invention relates to a negative stiffness device, in particular to an integrated torsion negative stiffness module, and belongs to the technical field of structural vibration control. Background Art

[0002] In the field of vibration control, negative stiffness devices have attracted much attention because they can effectively reduce the equivalent stiffness of the system and improve the acceleration control effect. Researchers continue to explore and develop new types of negative stiffness devices, such as negative stiffness devices based on magnetic materials, devices that use special mechanical structures to achieve negative stiffness, etc., in order to improve the performance and reliability of negative stiffness and expand its application range. In addition, through more precise theoretical analysis and modeling methods, the mechanical properties, dynamic response and stability of negative stiffness devices can be deeply studied, providing a more solid theoretical basis for their design and optimization. At the same time, combining negative stiffness devices with other vibration control technologies, such as inertia vessels and dampers, to form a composite vibration control device can give full play to the advantages of various technologies and improve the effect of vibration control. At present, in addition to the continuous deepening of application research in traditional fields such as mechanical engineering and building structures, the application of negative stiffness devices in emerging fields such as aerospace, precision instruments, and biomedicine has gradually attracted attention and exploration, such as in zero-gravity simulation of spacecraft and high-end audio equipment. Related patent technologies include: CN116732828A a negative stiffness local resonator vibration isolation structure, CN115899169A a building block assembled "negative stiffness" vibration isolation device, CN220365899U a magnetorheological vibration isolator with negative stiffness characteristics, CN111336210A a hybrid vibration control device, method and application based on negative stiffness and variable damping, CN104929245A a negative stiffness seismic isolation bearing, CN117366162A a negative stiffness electromagnetic damping device with adjustable damping, etc.

[0003] At present, negative stiffness devices have the following advantages: Good low-frequency vibration isolation effect: The negative stiffness device can effectively filter low-frequency vibration energy and reduce the vertical vibration force without affecting the static load supporting capacity of the spring. For example, in some instruments and equipment that are sensitive to low-frequency vibration, such as optical platforms and precision measuring instruments, the use of negative stiffness vibration isolation technology can reduce vibration to a level that traditional isolation equipment such as air cushion vibration isolation cannot achieve, thereby allowing the instrument to operate stably.

[0004] High static and low dynamic stiffness characteristics: The quasi-zero stiffness vibration isolation system has high static and low dynamic stiffness characteristics. It has higher stiffness to support the load under small displacement, and the stiffness decreases under large displacement. It can better adapt to changes in the vibration environment, effectively filter low-frequency vibration energy, and improve the vibration isolation effect.

[0005] Simple structure: The structure of the negative stiffness device is relatively simple, usually consisting of some mechanical components such as springs, dampers, etc., and does not require complex electronic equipment or control systems, which makes it relatively low in cost, high in reliability, and easy to install and maintain.

[0006] No external energy required: The negative stiffness device is a passive vibration control device that does not require external energy supply, such as electricity or gas. Therefore, it has unique advantages in some special environments or occasions, such as remote areas without power supply and areas sensitive to electromagnetic interference.

[0007] Wide range of applications: The negative stiffness device can be designed and adjusted according to different application requirements and is suitable for various types of vibration control scenarios, including building structures, bridges, mechanical equipment, aerospace and other fields.

[0008] However, in the prior art, it is difficult to achieve large-tonnage negative stiffness addition under the conditions of limited space and limited number of device layouts. Summary of the invention

[0009] In view of the above defects in the prior art, the present invention proposes an integrated torsional negative stiffness module, which aims to integrate the negative stiffness function into a single module through modular integrated design, fully utilize the installation space of the device, and realize large-tonnage negative stiffness of the device through the superposition of the mechanical properties of the array modules.

[0010] In order to achieve the above object, the technical solution adopted by the present invention is as follows: An integrated torsional negative stiffness module comprises a housing, a closed cover plate, a module fixing hole, a pin shaft, a pre-compression spring, a telescopic guide rod, a torsional connector, a spline connector sleeve, a connecting port, a flat key and a spline transmission shaft; The upper and lower sides of the shell are provided with closed cover plates and module fixing holes, a spline is provided in the middle position inside the shell, and the upper and lower closed cover plates are sleeved on the outer periphery of the spline; the spline includes an internal spline transmission shaft and a spline connecting sleeve sleeved on the outer periphery of the spline transmission shaft, the lower part of the spline connecting sleeve fixes the spline transmission shaft through a flat key, and the upper part is reserved for a spline interface for realizing pin connection with other modules; a connection port is also provided on the outer wall of the spline connecting sleeve; A pre-compression expansion device is connected between the connection port and each corner of the housing; The pre-stressed telescopic device includes a telescopic guide rod and a pre-compression spring sleeved on the telescopic guide rod. Both ends of the telescopic guide rod and the pre-compression spring are fixed and restricted on the torsion connectors on both sides; the torsion connector is connected to the shell and the connection port through a pin shaft.

[0011] Furthermore, the shell is triangular, and a pre-compression telescopic device is installed in the middle of each of its three corners.

[0012] Furthermore, the closing cover plate is connected to a cover plate fixing arm extending from the inner side of the housing corner by means of bolts.

[0013] Furthermore, the torsion connector is an upper and lower double rib structure, and a torsion connector arm is provided in the middle of the three corners of the shell. The torsion connector arm is inserted and fixed in the groove between the upper and lower double ribs of the torsion connector through a pin shaft.

[0014] Furthermore, the telescopic guide rod is telescopically connected to the torsion connectors on both sides.

[0015] Furthermore, the module fixing holes are arranged in the middle of the three sides of the housing.

[0016] Furthermore, an opening is provided on the side of the shell for observation.

[0017] Furthermore, the pre-compression spring in the negative stiffness module is always in a pre-compression state regardless of whether it is in the initial state or the working state. When the spline transmission shaft drives the spline connecting sleeve to rotate, the three groups of pre-compression springs are driven to rotate along the rotation direction. The pre-compression spring generates an elastic force component, namely a negative stiffness force, which causes the spline transmission shaft to rotate.

[0018] Compared with the prior art, the present invention has the following beneficial effects: The present invention can realize mutual latch connection between modules through a spline transmission shaft and a spline connecting sleeve, and the mechanical performance of the device can be flexibly combined and adjusted from multiple dimensions such as the module's own performance, the number of modules and the module combination scheme.

[0019] In addition, integrated modularization facilitates production line operations to improve product reliability, and enables batch pre-production to reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional view of the overall structure of an integrated torsional negative stiffness module of the present invention; Figure 2 1 is an internal structural view of an integrated torsional negative stiffness module of the present invention, wherein: (a) is an internal view of the integrated torsional negative stiffness module after removing one side of the outer shell; (b) is a schematic diagram of a pre-stressed telescopic device in the integrated torsional negative stiffness module; (c) is a schematic diagram of a spline in the integrated torsional negative stiffness module; Figure 3 is a top view of the housing of the present invention; Figure 4 is a three-dimensional diagram of the housing of the present invention; Figure 5 is a top view of the closed cover plate of the present invention; Figure 6 It is a schematic diagram of the spring force of an integrated torsion negative stiffness module in the initial state of the present invention; Figure 7 It is a schematic diagram of the spring force and torsion state of an integrated torsion negative stiffness module in working state of the present invention; Figure 8 It is the rotation angle-force relationship curve of the present invention. DETAILED DESCRIPTION

[0021] The following is combined with Figure 1-8 The present invention is further described in detail with specific implementations to facilitate a clear understanding of the present invention, but they do not constitute a limitation on the present invention.

[0022] Example 1 As attached Figure 1-2 As shown, an integrated torsional negative stiffness module of the present embodiment includes a triangular shell 1, a closed cover plate 2, a module fixing hole 3, a pin 4, a pre-compression spring 5, a telescopic guide rod 6, a torsional connector 7, a spline connecting sleeve 8, a connecting port 9, a flat key 10 and a spline transmission shaft 11.

[0023] like Figure 3-5 As shown, the upper and lower sides of the housing 1 are provided with a closed cover plate 2 and a module fixing hole 3, and the closed cover plate 2 is connected to the cover plate fixing arm 12 extending from the inner side of the corner of the housing 1 by bolts. An opening 14 is provided on the side of the housing 1 for observation.

[0024] In this embodiment, Figure 2 As shown, a spline is provided in the middle position inside the housing 1, and the upper and lower closed cover plates 2 are sleeved on the outer periphery of the spline. The spline includes an internal spline transmission shaft 11 and a spline connection sleeve 8 sleeved on the outer periphery of the spline transmission shaft 11. The spline transmission shaft 11 is fixed by a flat key 10 at the lower part of the spline connection sleeve 8, and a spline interface for realizing a plug connection with other modules is reserved at the upper part. A connection port 9 is also provided on the outer wall of the spline connection sleeve 8. A pre-stressed telescopic device is connected between the connection port 9 and each corner of the housing 1, that is, a pre-stressed telescopic device is installed in the middle of each of the three corners. The pre-stressed telescopic device includes a telescopic guide rod 6 and a pre-compression spring 5 sleeved on the telescopic guide rod 6. Both ends of the telescopic guide rod 6 and the pre-compression spring 5 are fixed and restricted on the torsion connector 7 on both sides, and the telescopic guide rod 6 is telescopically connected to the torsion connector 7 on both sides. The torsion connector 7 is connected to the housing 1 and the connection port 9 through a pin 4.

[0025] like Figure 2 and Figure 4 As shown, the torsion connector 7 is an upper and lower double rib structure, and a torsion connector arm 13 is provided in the middle of the three corners of the shell 1. The torsion connector arm 13 is inserted and fixed in the groove between the upper and lower double ribs of the torsion connector 7 through the pin shaft 4.

[0026] In this embodiment, module fixing holes 3 are provided in the middle of three sides of the housing 1 .

[0027] Example 2 like Figure 6-8 As shown, the pre-compression spring 5 in the negative stiffness module is always in a pre-compression state regardless of the initial state or the working state. When the spline transmission shaft 11 drives the spline connecting sleeve 8 to rotate, the three groups of pre-compression springs 7 are driven to rotate along the rotation direction. The pre-compression spring 7 generates an elastic force component, namely a negative stiffness force, which causes the spline transmission shaft 11 to rotate.

[0028] Example 3 In this embodiment, the housing 1 is in a polygonal shape other than the triangle of the embodiment 1. Its structure and connection method are the same as those of the embodiment 1 and will not be described in detail here.

[0029] The above is only a preferred embodiment of the present invention, and does not impose any formal limitation on the structure of the present invention. The layout type and the number of uses of the present invention are not limited to this example, and can be optimized and selected according to the actual project. Any modification, equivalent change and decoration of the above embodiment based on the technical principle of the present invention that does not deviate from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An integrated torsional negative stiffness module, characterized in that: It comprises a housing (1), a closed cover plate (2), a module fixing hole (3), a pin (4), a pre-compression spring (5), a telescopic guide rod (6), a torsion connector (7), a spline connecting sleeve (8), a connecting port (9), a flat key (10) and a spline transmission shaft (11); The upper and lower sides of the housing (1) are provided with closed cover plates (2) and module fixing holes (3); a spline is provided at the middle position inside the housing (1); the closed cover plates (2) on the upper and lower sides are sleeved on the outer periphery of the spline; the spline comprises an internal spline transmission shaft (11) and a spline connection sleeve (8) sleeved on the outer periphery of the spline transmission shaft (11); the lower part of the spline connection sleeve (8) is fixed with a flat key (10) on the spline transmission shaft (11); the upper part is reserved for a spline interface for realizing a pin connection with other modules; the outer wall of the spline connection sleeve (8) is also provided with a connection port (9); A pre-compression telescopic device is connected between the connection port (9) and each corner of the housing (1); The pre-compression telescopic device comprises a telescopic guide rod (6) and a pre-compression spring (5) sleeved on the telescopic guide rod (6); both ends of the telescopic guide rod (6) and the pre-compression spring (5) are fixedly restrained on torsion connectors (7) on both sides; the torsion connector (7) is connected to the housing (1) and the connection port (9) via a pin shaft (4).

2. The integrated torsional negative stiffness module according to claim 1, characterized in that: The housing (1) is triangular in shape, and a pre-compression telescopic device is installed in the middle of each of its three corners.

3. The integrated torsional negative stiffness module according to claim 2, characterized in that: The closed cover plate (2) is connected to a cover plate fixing arm (12) extending from the inner side of a corner of the housing (1) via bolts.

4. The integrated torsional negative stiffness module according to claim 3, characterized in that: The torsion connection piece (7) is an upper and lower double rib structure, and a torsion connection arm (13) is provided in the middle of the three corners of the housing (1). The torsion connection arm (13) is inserted into and fixed in a groove between the upper and lower double ribs of the torsion connection piece (7) via a pin shaft (4).

5. The integrated torsional negative stiffness module according to claim 4, characterized in that: The telescopic guide rod (6) is telescopically connected to the torsion connectors (7) on both sides.

6. The integrated torsional negative stiffness module according to claim 2, characterized in that: The module fixing holes (3) are arranged in the middle of the three sides of the housing (1).

7. The integrated torsional negative stiffness module according to claim 2, characterized in that: The side of the housing (1) is provided with an opening for observation.

8. The integrated torsional negative stiffness module according to claim 5, characterized in that: The pre-compression spring (5) in the negative stiffness module is always in a pre-compression state regardless of whether it is in an initial state or a working state. When the spline transmission shaft (11) drives the spline connection sleeve (8) to rotate, the three groups of pre-compression springs (5) are driven to rotate in the rotation direction. The pre-compression spring (5) generates an elastic force component, i.e., a negative stiffness force, which causes the spline transmission shaft (11) to rotate.

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