A design method for a screw-type limiting mechanism of a metamaterial vibration isolator

Abstract

The present invention discloses a design method for a screw-type limiting mechanism of a metamaterial vibration isolator, which belongs to the cross-technical field of metamaterials, vibration reduction and noise reduction. The screw-type limiting mechanism includes an upper plate of the vibration isolator, a lower plate of the vibration isolator, a cylinder, a long screw, a block and a locking screw. The upper and lower surfaces of the upper plate of the vibration isolator are respectively processed with mutually interpenetrating grooves, and the cylinder is rigidly connected to the lower plate of the vibration isolator; a circular block is rigidly assembled on the long screw, and the long screw is passed through the through hole of the groove of the upper plate of the vibration isolator and then screwed into the threaded through hole of the cylinder of the lower plate of the vibration isolator. By adjusting the screw-in depth, the limiting gap in the tension and compression directions is adjusted; a set screw is screwed into the threaded through hole on the other end face of the cylinder until the end face of the set screw contacts the end face of the long screw and then tightened. The present invention enables the metamaterial vibration isolator to have omnidirectional limiting functions in the tension, compression and 360° shear directions.

Description

Technical Field

[0001] The present invention belongs to the technical field of metamaterials and vibration and noise reduction, and in particular relates to a design method for a screw-type limiting mechanism of a metamaterial vibration isolator. Background Art

[0002] Metamaterials possess extraordinary physical properties not found in natural materials. They can transcend the limitations of certain apparent natural laws, thereby achieving extraordinary material functions beyond the ordinary properties inherent in nature. Vibration isolators designed using metamaterial technology are called metamaterial isolators. Their three-dimensional stiffness can be customized to achieve a balance between vertical and shear vibration isolation and stability.

[0003] In addition to designable stiffness, metamaterial isolators can also be designed with appropriate limiters to handle large loads such as impact and overload, thereby protecting equipment. Traditional rubber isolators, such as flat-plate and BE types, lack limiters or have a single, one-way limiter. Metamaterial isolators, however, offer strong design capabilities and high space utilization, leaving ample space for limiter designs. The introduction of limiters gives metamaterial isolators greater resistance to impact, sway, and damage than traditional rubber isolators, and enhances their environmental adaptability. Summary of the Invention

[0004] In view of this, the present invention provides a design method for a screw-type limiting mechanism of a metamaterial vibration isolator, which can enable the metamaterial vibration isolator to have omnidirectional limiting functions in tension, compression, and 360° shear directions.

[0005] A method for designing a screw-type limiting mechanism for a metamaterial vibration isolator, wherein the screw-type limiting mechanism includes an upper plate of the vibration isolator, a lower plate of the vibration isolator, a cylinder, a long screw, a stopper, and a locking screw. The mechanism design includes the following steps:

[0006] Step 1: grooves are processed on the upper and lower surfaces of the upper plate of the vibration isolator, and a through hole is passed through the grooves on both sides. The diameter of the through hole is smaller than the diameter of the two grooves and larger than the diameter of the long screw;

[0007] Step 2: The cylinder is rigidly connected to the lower plate of the vibration isolator as a whole, and the cylinder has a threaded through hole for fixing the long screw;

[0008] Step 3: Rigidly assemble the annular stopper on the long screw;

[0009] Step 4: Pass the long screw through the through hole of the countersunk groove on the upper plate of the vibration isolator and screw it into the threaded through hole of the cylindrical body of the lower plate of the vibration isolator. Adjust the limit gap in the tension and compression directions by adjusting the screw-in depth;

[0010] Step 5: Screw the set screw into the threaded through hole on the other end face of the cylinder until the end face of the set screw contacts the end face of the long screw and then tighten it.

[0011] Furthermore, the upper and lower isolator plates are components of the metamaterial isolator and are connected as a whole through the metamaterial isolator. Double-sided recessed grooves and cylindrical mounting holes are processed next to the metamaterial isolator. The external shapes of the upper and lower isolator plates are selected and designed according to actual conditions.

[0012] Furthermore, there is a gap between the cylinder and the upper plate of the vibration isolator in the compression and 360° shear directions, which is used for limiting the compression and 360° shear directions.

[0013] Furthermore, the rigid connection between the cylinder and the lower plate of the vibration isolator is achieved by welding, threaded fastening, integrated molding or interference fit.

[0014] Furthermore, there is a limiting gap in the pulling direction between the bottom surface of the stop block and the upper plate of the vibration isolator, which is used to achieve limiting in the pulling direction.

[0015] Furthermore, the rigid connection between the long screw and the stopper is achieved by interference fit, welding or integral molding.

[0016] Furthermore, anti-loosening glue is applied on the long screw in step 4 and the set screw in step 5.

[0017] Furthermore, the upper plate, lower plate, cylinder and stopper of the vibration isolator are made of metal materials, and the long screw and set screw are standard parts or customized.

[0018] Beneficial effects:

[0019] 1. The upper plate of the vibration isolator of the present invention is processed with a double-sided circular groove, and the long screw is rigidly assembled with a circular block to cooperate with the upper groove. Therefore, the long screw and the double-sided circular groove are the key parts and structures for achieving tension limiting; the cylinder is fixed on the lower plate and cooperates with the lower groove. The cylinder and the lower groove are the key parts and structures for achieving compression and 360° shear direction limiting. The above structural design can achieve omnidirectional limiting functions in the tension, compression, and 360° shear directions within the limited and narrow space inside the metamaterial vibration isolator, thereby improving the impact and overload resistance of the metamaterial vibration isolator and ensuring the functional stability of the vibration isolation system.

[0020] 2. The upper and lower plates of the vibration isolator of the present invention are components of the metamaterial vibration isolator and are connected as a whole through the metamaterial vibration isolator. Double-sided recessed grooves and cylindrical mounting holes are machined next to the metamaterial vibration isolator, so that the limited space on the vibration isolator can be used to install the limiting mechanism. The external shapes of the upper and lower plates of the vibration isolator are selected and designed according to actual conditions, making the design and processing of the product highly scalable.

[0021] 3. The present invention adjusts the limit of the vibration isolator in the tension and compression directions by adjusting the screwing depth of the long screw in the threaded hole of the cylinder. At the same time, the static deformation can be adjusted according to the actual load of the vibration isolator, which can ensure the required tension and compression limit values ​​of the vibration isolator under the actual load conditions.

[0022] 4. In the present invention, anti-loosening glue is applied to both the long screw in step 4 and the set screw in step 5, which can enhance the fixing effect between the long screw and the set screw and the matching parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall screw-type limiting structure of the metamaterial vibration isolator of the present invention;

[0024] Figure 2 This is the main hole and groove mark of the screw type limiting mechanism of the present invention;

[0025] Figure 3 This is a schematic diagram of the gap relationship of the screw-type limiting mechanism of the present invention;

[0026] Figure 4 is a 3D model of the metamaterial isolator in an embodiment of the present invention;

[0027] Figure 5 Schematic diagram of the specific dimensions of the limiting mechanism of the metamaterial vibration isolator in an embodiment of the present invention;

[0028] Among them, 1-isolator lower plate; 2-cylinder; 3-ring stopper; 4-long screw; 5-isolator upper plate; 6-set screw. DETAILED DESCRIPTION

[0029] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0030] The present invention provides a design method for a screw-type limiting mechanism of a metamaterial vibration isolator, as shown in the attached figure. Figure 1 As shown, the mechanism mainly includes an upper plate 5 of the vibration isolator, a lower plate 1 of the vibration isolator, a cylinder 2, a long screw 4, a stopper 3 and a locking screw 6. The steps of implementing the mechanism are as follows:

[0031] Step 1: Process circular grooves on the upper and lower sides of the vibration isolator upper plate 5. They are generally circular, but can also be other shapes. The grooves on both sides are connected. The diameter of the through hole should be smaller than the diameter of the two grooves and larger than the diameter of the long screw 4. The positions of the grooves and the through hole are as follows: Figure 2 shown.

[0032] Step 2: Prepare a cylinder 2, tap the center axis through it to fix the long screw 4, and rigidly connect the cylinder 2 and the lower plate 1 of the vibration isolator into a whole.

[0033] Step 3: Rigidly assemble the annular stopper 3 on the long screw 4.

[0034] Step 4: Apply anti-loosening glue to the long screw 4, pass it through the countersunk hole of the upper plate 5 of the vibration isolator, and screw it into the threaded hole of the cylinder 2 of the lower plate 1 of the vibration isolator. Adjust the limit gap in the tension and compression directions by adjusting the screw-in depth.

[0035] Step 5: Screw in the set screw on the other end face of the cylinder 2, apply anti-loosening glue to the thread until the end face of the set screw contacts the end face of the long screw, and tighten it. At this point, the design of the screw-type limit mechanism is completed.

[0036] like Figure 3 As shown, the proposed limiting mechanism can adapt to limiting in small spaces. The long screw 4 and the double-sided circular grooves of the upper plate 5 are key components and structures for achieving tension limiting. The cylinder 2 and the lower groove of the upper plate 5 are key components and structures for achieving compression and 360° shear limiting. The lower plate 1 and the set screw 6 are used to secure the long screw 4 and the cylinder 2. During assembly, the long screw 4 and the set screw 6 should be coated with anti-loosening glue to enhance the long screw's fixing effect.

[0037] In order to ensure that the screw type limit mechanism operates effectively in the actual use of the vibration isolator, it is necessary to specify the relationship between the various gaps in the mechanism, such as Figure 3As shown, the tension limit gap is dimension a. When the upper plate 5 is subjected to vertical tension, dimension a will gradually decrease until the bottom surface of the upper sink groove of the upper plate 5 contacts the stopper 3; the pressure limit gap dimension is dimension b. When the upper plate 5 is subjected to downward vertical pressure, dimension b will gradually decrease until the top surface of the lower sink groove of the upper plate 5 contacts the top surface of the cylinder. In order to ensure that dimension b is first reduced to 0, the pressure limit is implemented by dimension b. The height difference d between the nut of the screw 4 and the top surface of the upper plate must be greater than dimension b, and the distance g between the upper plate 5 and the lower plate 1 must be greater than dimension b; 360° shear The limit in the shear direction is achieved by the annular gap c formed between the diameter of the cylinder 2 and the inner diameter of the sinking groove of the upper plate 5. When the vibration isolator is subjected to shear deformation in any direction and exceeds the limit value, the cylinder 2 and the wall of the sinking groove of the upper plate 5 will contact and implement the limit. In order to implement the limit by the gap c, the gap e between the screw 4 and the through-hole wall of the sinking groove of the upper plate 5 must be larger than the gap c, and the annular gap f formed between the stop block 3 and the upper sinking groove of the upper plate 5 must be larger than the gap c, ensuring that the 360° shear direction limit is implemented by the cylinder 2, rather than the long screw 4.

[0038] In actual implementation, the limits in the tension and compression directions can be adjusted according to the static deformation of the actual load of the vibration isolator, mainly by adjusting the screwing depth of the long screw 4 in the threaded hole of the cylinder 2 to ensure the required tension and compression limit values ​​of the vibration isolator under actual load conditions.

[0039] If the metamaterial isolator is subjected to static tensile loads in actual use, the height difference h between the top surface of the cylinder and the bottom surface of the upper plate must be greater than the deformation under static load to ensure limited shear limit. If the metamaterial isolator is subjected to static compressive loads in actual use, the dimension h can be greater than 0, and the static deformation under the rated load must be less than the compressive limit gap dimension b.

[0040] Example:

[0041] The screw type limit mechanism design is carried out for the small load metamaterial vibration isolator with a rated load of MI60. Figure 4 As shown, the vibration isolator is a traditional honeycomb hexagonal metamaterial with 1 row and 2 columns. A screw-type limiting mechanism is designed in the space next to the vibration isolator. The entire vibration isolator is in an arc ring shape, as shown in FIG. Figure 5 As shown, the outer shapes of the upper plate 5 and the lower plate 1 of the vibration isolator are determined according to the size of the arc.

[0042] According to the design method of the screw-type limiting mechanism, the cylinder 2 and the lower plate 1 are connected as a rigid whole by welding, and the diameter of the cylinder 2 is 20 mm; the upper plate 5 is processed with circular upper and lower grooves, the upper groove has a diameter of 27 mm and a depth of 19.5 mm, the lower groove has a diameter of 27 mm and a depth of 6 mm, and through holes are drilled between the grooves, the through holes have a diameter of 16 mm and a height of 5.5 mm; the long screw 4 with a specification of M8×45 is fastened to the stopper 3 through a threaded method, and the long screw-stop assembly is screwed into the center threaded hole of the cylinder 2 through the through hole of the upper plate 5 and is locked with a set screw 6. In the free state without load, the tensile limit dimension a of the limiting mechanism is 3.5 mm, the compressive limit dimension b is 3.5 mm, the height difference d between the nut of the screw 4 and the top surface of the upper plate 5 is 4 mm, the distance g between the upper plate 5 and the lower plate 1 is 17 mm, and the dimensions b and g are both larger than the compressive limit dimension b; in the free state without shear load, the 360° shear limit dimension e of the limiting mechanism is 3.5 mm, the gap e between the screw 4 and the through-hole wall of the upper plate 5 recess is 4 mm, and the annular gap f formed between the block 3 and the upper recess of the upper plate 5 is 3.7 mm, all of which are larger than the limit dimension e. The vibration isolator in this embodiment is a vibration isolator subjected to pressure load, and the dimension h can be greater than 0. In this embodiment, the dimension h is 2.5 mm. The static deformation of the vibration isolator in this embodiment under a rated load of 60 kg is 1.34 mm, which is less than the compressive limit dimension of 3.5 mm, and there is still 2.16 mm of compressive limit space under the rated load.

[0043] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for designing a screw-type limiting mechanism for a metamaterial isolator, characterized in that: The screw-type limiting mechanism includes an upper plate of a vibration isolator, a lower plate of a vibration isolator, a cylinder, a long screw, a stopper and a locking screw. The mechanism design includes the following steps: Step 1: grooves are processed on the upper and lower surfaces of the upper plate of the vibration isolator, and a through hole is passed through the grooves on both sides. The diameter of the through hole is smaller than the diameter of the two grooves and larger than the diameter of the long screw; Step 2: The cylinder is rigidly connected to the lower plate of the vibration isolator as a whole, and the cylinder has a threaded through hole for fixing the long screw; Step 3: Rigidly assemble the annular stopper on the long screw; Step 4: Pass the long screw through the through hole of the countersunk groove on the upper plate of the vibration isolator and screw it into the threaded through hole of the cylindrical body of the lower plate of the vibration isolator. Adjust the limit gap in the tension and compression directions by adjusting the screw-in depth; Step 5: Screw the set screw into the threaded through hole on the other end of the cylinder until the end face of the set screw contacts the end face of the long screw and then tighten it; There is a gap between the cylinder and the upper plate of the isolator in the compression and 360° shear directions, which is used for limiting the compression and 360° shear directions; there is a limiting gap in the tension direction between the bottom surface of the stop block and the upper plate of the isolator, which is used to achieve limiting in the tension direction.

2. The method for designing a screw-type limiting mechanism for a metamaterial isolator according to claim 1, wherein: The upper and lower vibration isolator plates are components of the metamaterial vibration isolator and are connected as a whole through the metamaterial vibration isolator. Double-sided recessed grooves and cylindrical mounting holes are processed next to the metamaterial vibration isolator. The external shapes of the upper and lower vibration isolator plates are selected and designed according to actual conditions.

3. The method for designing a screw-type limiting mechanism for a metamaterial isolator according to claim 2, wherein: The rigid connection between the cylinder and the lower plate of the vibration isolator is achieved by welding, threaded fastening, integrated molding or interference fit.

4. The method for designing a screw-type limiting mechanism for a metamaterial isolator according to claim 3, wherein: The rigid connection between the long screw and the stopper is achieved by interference fit, welding or integral molding.

5. The method for designing a screw-type limiting mechanism for a metamaterial isolator according to claim 4, wherein: Anti-loosening glue is applied on the long screw in step 4 and the set screw in step 5.

6. The method for designing a screw-type limiting mechanism for a metamaterial isolator according to claim 3 or 4, wherein: The upper plate, lower plate, cylinder and stopper of the vibration isolator are made of metal materials, and the long screw and set screw are standard parts or customized.

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