A pre-assembled system of low-height, high-performance vibration-damping fasteners

Abstract

This utility model discloses a low-height, high-performance vibration-damping fastener pre-assembly system, relating to the field of rail transit technology. The pre-assembly system includes an insulating coupling pad, a lower iron pad, a middle rubber pad, and an upper iron pad. Limiting transverse blocks are provided on both sides of the upper iron pad, which are pre-assembled with the lower iron pad via these blocks. A limiting boss on the upper iron pad engages the inner side of the blocking blocks, while a shoulder boss on the lower iron pad has a fixing groove that engages the outer side of the blocking blocks. The limiting transverse blocks are Z-shaped, with a lower locking boss that tightly fits the fixing groove of the lower iron pad, and an upper clamping boss that fixes the upper iron pad. The middle rubber pad on the lower iron pad has an embedded mounting position. By thinning the components, the installation height is reduced, and by changing the material and structure of the rubber pad, vibration damping performance is improved. All components form a pre-assembled body, facilitating transportation and installation, and effectively improving efficiency.

Description

Technical Field

[0001] This utility model relates to the field of rail transit technology, specifically to a pre-assembly system for low-height, high-grade vibration-damping fasteners. Background Technology

[0002] In the field of rail transit, fastening systems, as core components of track structures, directly affect the smoothness, safety, and comfort of train operation. With the continuous expansion of urban rail transit networks and the increase in their operational years, a large number of early-built track lines urgently need upgrading. However, upgrading existing lines faces multiple challenges: on the one hand, due to the early-planned tunnel cross-sectional dimensions and elevated structure clearance height, traditional high-strength vibration-damping fasteners, due to their large height, are difficult to adapt to the space constraints of existing lines and cannot be directly applied; on the other hand, to minimize the impact on normal urban traffic operations, upgrading projects often need to be carried out under stringent conditions of no or minimal downtime, which places extremely high demands on the convenient installation and efficient construction of fasteners.

[0003] Meanwhile, with rapid urban development, the number of environmentally sensitive areas along rail lines, such as residential areas, schools, and hospitals, has increased significantly, leading to increasingly stringent requirements for track vibration and noise reduction performance. However, the existing track's foundation structure and spatial conditions severely limit the possibility of improving vibration reduction through large-scale civil engineering projects. Existing advanced vibration-damping fasteners mostly rely on increasing the thickness of the rubber pad layer or adding multiple layers of elastic elements to enhance vibration reduction performance. This not only further increases the installation height of the fasteners but also results in the components being scattered, making them prone to loss during transportation and installation, and causing cumbersome installation procedures, which are difficult to meet the special needs of existing track renovation. Therefore, the development of a new fastener system with low installation height, high vibration reduction performance, and easy installation is urgently needed. Utility Model Content

[0004] The purpose of this utility model is to provide a pre-assembled system for low-height, high-performance vibration damping fasteners. This product achieves a low installation height by thinning the components, improves vibration damping performance by changing the material and structure of the rubber pad, and the components form a pre-assembled body, which facilitates transportation and installation, effectively improves installation efficiency, and meets the required high-performance vibration damping without changing the installation height in the renovation of old lines.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a pre-assembly system for a low-height, high-grade vibration-damping fastener, comprising, from bottom to top, an insulating coupling pad, a lower iron pad, a middle rubber pad, and an upper iron pad; limiting transverse blocks are provided on both sides of the upper iron pad; the upper iron pad and the lower iron pad are pre-assembled together by the limiting transverse blocks to form a pre-assembly system; a limiting boss is provided on the upper iron pad to lock the inner side of the limiting transverse block; a shoulder boss is provided on the lower iron pad, and a fixing groove is provided on the shoulder boss for locking the outer side of the limiting transverse block; the limiting transverse block is Z-shaped, and a locking boss that cooperates with the fixing groove is provided on the lower side of the limiting transverse block; a pressing boss on the upper side of the limiting transverse block is used to fix the upper iron pad; the installation position of the middle rubber pad on the lower iron pad is set to be embedded to reduce the installation height.

[0006] To further optimize this utility model, the following technical solutions may be preferred: Preferably, the upper iron pad is provided with symmetrically arranged spring clip seats, and the rear side of the spring clip seat is provided with a limiting boss for locking the limiting lateral stop block. The spring clip seats are symmetrically arranged.

[0007] Preferably, the shoulder protrusions on both sides of the lower iron pad are symmetrically arranged, and the bolt mounting hole position of the lower iron pad is provided with a tapered bayonet protrusion that closely cooperates with the insulating clamping block.

[0008] Preferably, the spring bar seat has a mounting hole on one side, which cooperates with the snap-fit ​​boss on the lower iron pad, and anti-rotation bosses are provided on both sides of the mounting hole to prevent the adjustment cover from rotating.

[0009] Preferably, insulating clamping blocks are installed on both sides of the lower iron pad, and the clamping flanges of the insulating clamping blocks are pressed against the upper iron pad; the upper iron pad and the lower iron pad are pre-tightened by limiting lateral limiting blocks.

[0010] Preferably, the insulating clamping block is made of insulating material. One side of the insulating clamping block has a clamping flange for clamping the upper iron pad. The insulating clamping block has an installation groove that allows it to tightly engage with a protrusion on the lower iron pad during installation. The lower side of the insulating clamping block has a locking protrusion that allows it to tightly engage with a long hole in the lower iron pad during installation, providing a certain clamping force on the upper iron pad. The upper side of the insulating clamping block has adjusting teeth that cooperate with an adjusting cover plate to adjust the overall position of the fastener. The lower side of the insulating clamping block has a protrusion that tightly engages with the lower iron pad.

[0011] Preferably, the nail post of the intermediate rubber pad adopts a non-uniform design, and the shape of the intermediate rubber pad matches the lower iron pad plate.

[0012] Preferably, the outer edge of the insulating coupling pad is provided with a covering area for covering the lower iron pad, and the two sides of the insulating coupling pad are also provided with limiting plates to restrict the displacement of the upper iron pad.

[0013] The beneficial effects of this utility model are as follows: (1) In terms of reducing the installation height, the installation position of the middle rubber pad in the lower iron pad is set to be embedded. At the same time, the bolt mounting hole position is provided with a conical bayonet boss that closely matches the insulating buckle block, or the shoulder bosses on both sides are staggered, which effectively reduces the overall thickness of the fastener, meets the strict requirements of existing line renovation for low installation height, and solves the problem that traditional high-level vibration damping fasteners are difficult to adapt to limited space due to excessive height.

[0014] (2) In terms of improving vibration reduction performance, the nail column of the middle rubber pad adopts a non-uniform design and its shape is closely matched with the lower iron pad plate, which can more reasonably distribute the load and absorb vibration energy; the multi-layer elastic structure such as the insulating coupling pad plate and the middle rubber pad works together to greatly enhance the vibration reduction and noise reduction effect of the fastener, which can effectively meet the high requirements for vibration reduction performance due to the increase in environmentally sensitive points along the track.

[0015] (3) In terms of transportation and installation convenience, the upper and lower iron pads are pre-assembled into a pre-assembled system through limiting transverse blocks and insulating clamping blocks, which reduces the degree of fragmentation of parts during installation, reduces the risk of loss of parts, and clarifies the installation sequence, significantly improving installation efficiency; the insulating clamping block is made of nylon material and has an embedded steel sleeve, taking into account both strength and insulation performance. Its clamping flange, locking boss, and adjusting teeth structure design enable the fastener to be quickly positioned and accurately adjusted during installation; the unique Z-shaped structure of the limiting transverse block and the design of the locking boss and clamping boss, together with the limiting structure of the lower and upper iron pads, further enhance the stability of the pre-assembled system; the covering area and limiting plate of the insulating coupling pad not only play an insulating role, but also effectively limit the displacement of the upper iron pad, ensuring the overall reliability and stability of the fastener, especially suitable for the rapid construction needs under the conditions of no or few shutdowns in the renovation of old lines. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the low-height, high-grade vibration damping fastener pre-assembly system in Example 1; Figure 2 This is a cross-sectional view of the pre-assembled system of low-height, high-grade vibration damping fasteners in Example 1. Figure 3 This is a schematic diagram of the upper iron pad in Example 1; Figure 4 This is a schematic diagram of the lower iron pad in Example 1; Figure 5This is a schematic diagram of the adjustable cover plate in Example 1; Figure 6 This is a schematic diagram of the insulating coupling pad in Example 1; Figure 7 This is a schematic diagram of the overall structure of the low-height, high-grade vibration damping fastener pre-assembly system in Example 2; Figure 8 This is a schematic diagram of the upper iron pad in Example 2; Figure 9 This is a schematic diagram of the lower iron pad in Example 2; Figure 10 This is a schematic diagram of the limiting transverse stop block in Example 2; Figure 11 This is a schematic diagram of the insulating clamping block in Example 2; Figure 12 This is a schematic diagram of the insulating coupling pad in Example 2; Figure 13 This is a schematic diagram of the overall structure of the low-height, high-grade vibration damping fastener pre-assembly system in Example 3; Figure 14 This is a schematic diagram of the upper iron pad in Example 3; Figure 15 This is a schematic diagram of the lower iron pad in Example 3; Figure 16 This is a schematic diagram of the structure of the intermediate rubber pad in Example 3; Figure 17 This is a schematic diagram of the insulating coupling pad in Example 3; Figure 18 This is a schematic diagram of the structure of the lower iron pad in Example 4.

[0017] The components include: 1. Insulating coupling pad; 2. Lower iron pad; 3. Middle rubber pad; 4. Upper iron pad; 5. Limiting transverse stop block; 6. Insulating clamping block; 7. Adjustable gap cover plate; 101 - Limit plate; 201-Shoulder boss; 202-Fixing groove; 203-Bolt mounting hole; 204-Clamping boss; 401 - Spring bar seat; 402 - Limiting boss; 403 - Mounting hole; 404 - Anti-rotation boss; 501 - Socket boss; 601-Clipping flange; 602-Adjusting tooth; 603-Clamping boss. Detailed Implementation

[0018] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] A pre-assembly system for a low-height, high-grade vibration-damping fastener includes, from bottom to top, an insulating coupling pad 1, a lower iron pad 2, an intermediate rubber pad 3, and an upper iron pad 4. The upper and lower iron pads are pre-assembled together by a limiting transverse stop 5 and an insulating clamping block 6 to form a pre-assembly system. The upper iron pad is designed with a limiting boss to lock the inner side of the limiting transverse stop. The lower iron pad is designed with a shoulder boss with a fixing groove for locking the outer side of the limiting transverse stop. The insulating clamping block includes a clamping block body, a clamping flange for clamping the upper iron pad on one side of the top of the clamping block body, a clamping boss for tightly engaging with the elongated hole of the lower iron pad on the lower side of the clamping block body, adjusting teeth for adjusting the overall position of the fastener in conjunction with an adjusting cover plate on the upper side of the clamping block body, and a bolt mounting hole through the middle of the clamping block body.

[0021] As a preferred option, the upper iron pad is designed with symmetrically arranged spring clip seats.

[0022] As a preferred option, the shoulder protrusions on both sides of the lower iron pad are symmetrically designed, and the installation position of the middle rubber pad on the lower iron pad is set to be embedded to reduce the installation height; the bolt mounting hole position of the lower iron pad is provided with a tapered bayonet protrusion that fits tightly with the insulating clamping block.

[0023] Preferably, the shoulder protrusions on both sides of the lower iron pad are staggered, and the installation position of the middle rubber pad on the lower iron pad is set to be embedded to reduce the installation height; the bolt mounting holes on the lower iron pad are tightly fitted with the insulating clamping block.

[0024] During on-site construction, the pre-assembled low-height, high-grade vibration-damping fasteners are laid on the track bed sleepers. Anchor bolts are used to fix the pre-assembled fasteners to the sleepers. Then, rail pads are placed on the upper rail base plate. After the rails are lowered, gauge blocks are installed on the upper rail base plate, and the rail position is adjusted. Next, elastic clips are installed using installation tools, and the elastic clips press the gauge blocks to secure the rails. Because the fastener interfaces used on existing lines differ, the appearance of the low-height, high-grade vibration-damping fasteners varies. The following are the specific structures of the low-height, high-grade vibration-damping fasteners in various embodiments.

[0025] Example 1: like Figure 1-6 As shown, the pre-assembly system in this embodiment includes: (1) Upper iron pad 4: The upper iron pad is provided with a limiting boss on the back side of the spring bar seat to lock the limiting lateral block. The spring bar seat is symmetrically arranged. An installation hole 403 is opened on one side of the spring bar seat to cooperate with the locking boss on the lower iron pad. Anti-rotation bosses 404 are provided on both sides of the installation hole to prevent the adjustment cover from rotating.

[0026] (2) Lower iron pad 2: The lower iron pad is symmetrically provided with shoulder protrusions on both sides. The protrusions are provided with fixing grooves for locking and limiting the transverse stop blocks. The middle rubber pad on the iron pad is set to be embedded to reduce the installation height. The bolt mounting hole is provided with a tapered locking protrusion that can cooperate with the mounting hole of the upper iron pad. The locking protrusion is provided with adjusting teeth that cooperate with the adjusting teeth on the adjusting cover plate to adjust the track gauge.

[0027] (3) Adjustable cover plate 7: Adjustable teeth are provided on the adjustable cover plate.

[0028] (4) Intermediate rubber pad 3: The intermediate rubber pad nail column adopts a non-uniform design and its shape matches the lower iron pad plate; by changing the hardness of the intermediate rubber pad, the intermediate rubber pad can still achieve the specified vibration reduction performance after the thickness is reduced.

[0029] (5) Limiting transverse block 5: The limiting transverse block is Z-shaped. The lower side of the limiting transverse block is provided with a locking boss 501, which fits tightly with the fixing groove on the lower iron pad; the upper side of the limiting transverse block is used to fix the upper iron pad.

[0030] (6) Insulating coupling pad 1: The insulating coupling pad wraps the lower side of the lower iron pad, which can play an insulating protection role; the insulating coupling pad is provided with limit plates on both sides, which can limit the displacement of the upper iron pad, ensure the rigidity of the fastener, and play a safety protection role.

[0031] Example 2: like Figure 7-12 As shown, the composition and installation method of the fastener in Example 1 are the same as those described above, and its structural features are as follows: (1) Upper iron pad 4: The upper iron pad is provided with a limiting boss 402 on the rear side of the spring bar seat 401 to lock the limiting horizontal block. The spring bar seat is symmetrically arranged.

[0032] (2) Lower iron pad 2: The lower iron pad is symmetrically provided with shoulder protrusions 201 on both sides, and a fixing groove 202 is provided on the protrusion for snapping and limiting the transverse stop block; the middle rubber pad on the iron pad is set to be embedded to reduce the installation height; a tapered snap protrusion 204 is provided at the bolt mounting hole 203 position, which can be tightly matched with the insulating snap block.

[0033] (3) Insulating clamping block 6: The insulating clamping block is made of insulating material. A clamping flange 601 is provided on one side of the insulating block to clamp the upper iron pad. An installation groove is provided on the insulating clamping block so that it can be tightly fitted with the boss on the lower iron pad during installation. A clamping boss 603 is provided on the lower side of the insulating clamping block so that it can be tightly fitted with the long hole of the lower iron pad during installation, so that the insulating clamping block has a certain clamping force on the upper iron pad. An adjusting tooth 602 is provided on the upper side of the insulating clamping block. The tooth and the adjusting cover plate are used to adjust the overall position of the fastener. The insulating clamping block can play an insulating protection role by separating the anchor bolt, the adjusting cover plate and the iron pad. A boss is provided on the lower side of the insulating clamping block so that it can be tightly fitted with the lower iron pad.

[0034] (4) Intermediate rubber pad: The intermediate rubber pad nail column adopts a non-uniform design and its shape matches the lower iron pad plate; by changing the hardness of the intermediate rubber pad, the intermediate rubber pad can still achieve the specified vibration reduction performance after the thickness is reduced.

[0035] (5) Insulating coupling pad 1: The insulating coupling pad wraps the lower side of the lower iron pad, which can play an insulating protection role; the insulating coupling pad is provided with limit plates 101 on both sides, which can limit the displacement of the upper iron pad, ensure the rigidity of the fastener, and play a safety protection role.

[0036] (6) Limiting transverse block 5: The limiting transverse block is Z-shaped. The lower side of the limiting transverse block is provided with a locking boss 501, which fits tightly with the fixing groove on the lower iron pad; the upper side of the limiting transverse block is used to fix the upper iron pad.

[0037] Example 3: like Figure 13-17 As shown, the composition and installation method of the fastener in Example 2 are the same as those described above, and its structural features are as follows: (1) Upper iron pad: The upper iron pad is provided with a limiting boss on the rear side of the spring bar seat to lock the limiting horizontal block. The spring bar seat is designed with staggered arrangement.

[0038] (2) Lower iron pad: The lower iron pad has shoulder protrusions arranged in staggered rows on both sides, and a fixing groove is opened on the protrusion for locking and limiting the transverse stop block; the middle rubber pad on the iron pad is set to be embedded to reduce the installation height; in the second embodiment, no protrusion is provided at the anchor bolt mounting hole of the lower iron pad, and it is tightly matched with the insulating clamping block through the long hole.

[0039] (3) Limiting transverse stop: consistent with Example 1.

[0040] (4) Intermediate rubber pad: The intermediate rubber pad nail column adopts a non-uniform design and its shape matches the lower iron pad plate; by changing the hardness of the intermediate rubber pad, the intermediate rubber pad can still achieve the specified vibration reduction performance after the thickness is reduced.

[0041] (5) Insulating coupling pad 1: The insulating coupling pad is made of insulating material (nylon material). The insulating coupling pad wraps the lower side of the lower iron pad and can play an insulating and protective role.

[0042] (6) Insulating clamping block: The insulating clamping block is made of nylon and has an embedded steel sleeve. One side of the insulating block is provided with a clamping flange for clamping the upper iron pad. The lower side of the insulating clamping block is provided with a clamping boss that can fit tightly with the long hole on the lower iron pad during installation, so that the insulating clamping block has a certain clamping force on the upper iron pad. The upper side of the insulating clamping block is provided with adjusting teeth, which cooperate with the adjusting cover plate to adjust the overall position of the fastener. The insulating clamping block separates the anchor bolt, adjusting cover plate and iron pad, thus playing an insulating protection role.

[0043] Example 4: like Figure 18 As shown, its structural features are: (1) Upper iron pad: The upper iron pad has a limiting boss on the back side of the spring bar seat to lock the limiting transverse block.

[0044] (2) Lower iron pad: The lower iron pad has shoulder protrusions arranged in staggered rows on both sides, and a fixing groove is provided on the protrusion for snapping and limiting the transverse stop block; the middle rubber pad on the iron pad is set to be embedded to reduce the installation height; the bolt mounting hole is provided with a tapered snap-fit ​​protrusion, which can be tightly matched with the insulating snap-fit ​​block.

[0045] (3) Insulating clamping block: Same as in Example 1.

[0046] (4) All other parts and components are the same as in Example 2.

[0047] The installation method of the core component based on the above embodiments is as follows: Pre-assembly assembly installation steps: First, install the lower iron pad and the insulating coupling pad. During installation, first insert one side of the limiting plate on both sides of the insulating coupling pad into the lower iron pad, and then tighten the other side into the upper iron pad. Then, install the middle rubber pad on the lower iron pad. Next, align the anchor bolt holes of the upper iron pad with the anchor bolt holes of the lower iron pad, so that the lower flange of the upper iron pad presses against the middle rubber pad. Use the tight fit between the insulating clamping block and the lower iron pad to initially fix the upper iron pad and restrict its movement. Finally, clamp the lower locking boss of the transverse limiting block into the fixing groove of the shoulder boss on the lower iron pad, so that the clamping boss on the upper side of the transverse limiting block presses against the upper iron pad, completing the pre-assembly of the fastener.

[0048] Installation method of insulating clamping blocks in Examples 1 and 3: Before installing the insulating clamping blocks, the insulating coupling pad, intermediate rubber pad, lower iron pad, and upper iron pad have been placed in appropriate positions. When installing the insulating clamping blocks, the side with the clamping flange should be aligned with the upper iron pad, and the clamping boss should be aligned with the hole of the clamping boss on the lower iron pad. Insert the clamping boss into the hole of the clamping boss, and use a rubber hammer to hammer the insulating clamping block downwards until the clamping flange presses against the upper iron pad. At this time, the clamping boss is engaged in the mounting groove of the insulating clamping block and fits tightly to prevent the insulating clamping block from moving upwards.

[0049] Installation method of insulating clamping block in Example 2: When installing insulating clamping block, the side with clamping flange should be aligned with the upper iron pad, and the clamping boss should be aligned with the anchor bolt hole on the lower iron pad. Use a rubber hammer to hammer the insulating clamping block downwards until the clamping flange presses against the upper iron pad. The clamping boss and the bolt mounting hole of the lower iron pad should fit tightly to prevent the insulating clamping block from moving upwards.

[0050] Installation method of the lateral limit block: Before installing the lateral limit block, the insulating clamping block has been installed in place. Secure the lower locking protrusion of the lateral limit block into the fixing groove of the shoulder protrusion on the lower iron plate, so that the clamping protrusion on the upper side of the lateral limit block presses against the upper iron plate.

[0051] Based on the above product structure, the technical principle of this fastener is as follows: (1) Principle of improving the pull-out resistance of fasteners - A flange is added to the insulating clamping block. When installing the fastener, the insulating clamping block clamps the fastener and also clamps the upper iron pad, which significantly improves the pull-out resistance of the fastener.

[0052] (2) Limiting transverse block anti-detachment and clamping principle - The bottom of the limiting transverse block has an outward protrusion, and the middle of the protrusion has an arc structure. The inner side of the shoulder of the lower iron pad is provided with a groove to cooperate with it. The arc structure of the protrusion can effectively prevent the transverse block from detaching longitudinally. The protrusion and the groove can effectively prevent the transverse block from detaching vertically. The upper side of the limiting transverse block is provided with a clamping protrusion, which can clamp the edge of the upper iron pad. The middle rubber pad is elastic and can push the upper iron pad to make close contact with the clamping protrusion.

[0053] (3) Principle of improving longitudinal and lateral stability - The upper and lower iron pads are equipped with shoulder structures on both sides, and the shoulder is equipped with a limiting lateral stop block. The assembly is tight fit, and the shoulder structure effectively improves the longitudinal and lateral stability of the fastener.

[0054] (4) Pre-assembly principle - The insulating clamping block clamps the upper iron pad and the limiting transverse shoulder pre-tightens it. First, the mounting groove of the insulating clamping block and the locking boss of the lower iron pad are tightly fitted. The locking boss on the lower side of the insulating clamping block is also tightly fitted with the mounting elongated hole of the lower iron pad. When the insulating clamping block is installed in place, its flange will press the edge of the upper iron pad and exert a downward clamping force on the upper iron pad, while preventing the upper iron pad from rotating. Secondly, the limiting transverse shoulder also exerts a downward clamping force on the upper iron pad, which is more reliable. The upper iron pad, the middle rubber pad and the lower iron pad are pre-assembled together.

[0055] The advantages of this fastener are: ① The fastener installation height is ≤48mm, which is suitable for the installation height required for existing line renovation. It can be directly applied to existing lines, and without large-scale construction to replace the fasteners while meeting vibration reduction performance requirements, it is beneficial to replace existing line fasteners without interrupting the line. ② The new pre-assembly system facilitates rapid pre-assembly, which improves pre-assembly efficiency. Using pre-assembled components during line construction can improve construction efficiency. ③ The use of insulating clamping blocks and insulating coupling pads to isolate the anchor bolts from the iron pad, and the insulating coupling pads wrapping around the lower iron pad, helps to improve the insulation performance of the fastener.

[0056] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pre-assembly system for low profile high damping fasteners, characterized by: The system includes, from bottom to top, an insulating coupling pad, a lower iron pad, a middle rubber pad, and an upper iron pad. Limiting transverse blocks are provided on both sides of the upper iron pad. The upper and lower iron pads are pre-assembled together by the limiting transverse blocks to form a pre-assembled system. A limiting boss is provided on the upper iron pad to engage the inner side of the limiting transverse block. A shoulder boss is provided on the lower iron pad, with a fixing groove for engaging the outer side of the limiting transverse block. The limiting transverse block is Z-shaped, with a locking boss on its lower side that mates with the fixing groove, and a clamping boss on its upper side for fixing the upper iron pad. The middle rubber pad on the lower iron pad is recessed to reduce installation height.

2. A pre-assembled system of low profile high damping fasteners according to claim 1, characterized in that: The upper iron pad is provided with symmetrically arranged spring bar seats, and a limiting boss is provided on the rear side of the spring bar seat to lock the limiting lateral block. The spring bar seats are symmetrically arranged.

3. A pre-assembled system of low profile high damping fasteners according to claim 2, wherein: The shoulder protrusions on both sides of the lower iron pad are symmetrically arranged, and the bolt mounting hole position of the lower iron pad is provided with a tapered bayonet protrusion that closely cooperates with the insulating clamping block.

4. A pre-assembled system of low profile high damping fasteners according to claim 3, wherein: The spring bar seat has a mounting hole on one side, which cooperates with the snap-fit ​​boss on the lower iron pad. Anti-rotation bosses are provided on both sides of the mounting hole to prevent the adjustment cover from rotating.

5. The pre-assembly system of a low-height, high-grade vibration-damping fastener according to claim 1, characterized in that: Insulating clamping blocks are installed on both sides of the lower iron pad, and the clamping flanges of the insulating clamping blocks are pressed against the upper iron pad; the upper iron pad and the lower iron pad are pre-tightened by limiting lateral limiting blocks.

6. A pre-assembled system of low profile high damping fasteners according to claim 5, wherein: The insulating clamping block is made of insulating material. One side of the insulating clamping block has a clamping flange for clamping the upper iron pad. The insulating clamping block has an installation groove that allows it to tightly engage with a boss on the lower iron pad during installation. The lower side of the insulating clamping block has a locking boss that allows it to tightly engage with a long hole in the lower iron pad during installation, providing a certain clamping force on the upper iron pad. The upper side of the insulating clamping block has adjusting teeth that cooperate with an adjusting cover plate to adjust the overall position of the fastener. The lower side of the insulating clamping block has a boss that tightly engages with the lower iron pad.

7. A low profile high damping fastener pre-assembly system according to claim 1, wherein: The nail post of the intermediate rubber pad adopts a non-uniform design, and the shape of the intermediate rubber pad matches the lower iron pad plate.

8. A pre-assembled system of low profile high damping fasteners according to claim 1, wherein: The outer edge of the insulating coupling pad is provided with a covering area for covering the lower iron pad, and the two sides of the insulating coupling pad are also provided with limiting plates to restrict the displacement of the upper iron pad.

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