Shield tail sealing brush with "transition r-angle"
By introducing a buffer component and a transition R-angle design into the tail shield sealing brush, the problems of stress concentration and structural instability in the tail shield sealing brush are solved, achieving higher impact resistance and service life, and ensuring the stability and reliability of sealing performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- KUNSHAN ZHONGBEI MASCH EQUIP CO LTD
- Filing Date
- 2025-08-04
- Publication Date
- 2026-06-12
AI Technical Summary
In existing shield tail sealing brushes, the front protective plate has a right angle or small chamfer structure at the end, which leads to stress concentration and easily causes fatigue cracks. In addition, there is no buffer structure between the rear end of the brush spring assembly and the lower clamping plate, so the impact energy is quickly transferred to the plate root and spring root, resulting in failures such as root breakage and loosening.
The design incorporates a mounting bracket with cushioning components, including a storage shell, telescopic sleeve, and buffer blocks. Combined with a spring-loaded cushioning structure, this forms a buffer extension zone to mitigate impact loads. The front protective plate features a transition radius (R-angle) to enhance structural stability. Gradient reinforcement blocks strengthen the rigidity at the base of the plate and disperse impact forces.
It effectively alleviates the impact load at the tail of the wire spring assembly, reduces stress concentration, improves impact resistance and service life, prevents displacement and damage, ensures sealing performance and reliability, and improves overall durability and stability.
Smart Images
Figure CN224351958U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of shield tail sealing brush technology, and in particular to a shield tail sealing brush with a "transition R angle". Background Technology
[0002] The shield tail sealing brush, as a core sealing component in shield tunneling, typically includes an upper pressure plate, a front protection plate, a brush spring assembly, a packing ring, and a lower pressure plate. The front protection plate directly withstands the impact loads generated during retraction or segment assembly, while the brush spring assembly achieves primary sealing and interception of sediment through the elastic compression of multiple helical steel wire springs and composite brush filaments.
[0003] In existing shield tail sealing brushes, the front protective plate end is often a right angle or small chamfer structure, which causes stress to concentrate in the plate end area during impact, making it very easy to cause fatigue cracks. In addition, there is no special buffer structure between the rear end of the brush spring assembly and the lower clamping plate. After the impact energy enters the brush spring assembly, it is often quickly transmitted to the plate root and spring root, which is difficult to be effectively attenuated, resulting in failure phenomena such as root breakage and brush spring loosening. Utility Model Content
[0004] Based on this, it is necessary to address the issue that in existing shield tail sealing brushes, the front protective plate end is often a right angle or small chamfer structure, causing stress concentration in the plate end area during impact, which easily leads to fatigue cracks. Furthermore, the lack of a dedicated buffer structure between the rear end of the brush spring assembly and the lower clamping plate means that impact energy is often rapidly transmitted to the plate root and spring root after entering the brush spring assembly, making effective attenuation difficult and causing root fracture, brush spring loosening, and other failures. A shield tail sealing brush with a "transition R-angle" is provided, comprising: a mounting frame, with a steel wire spring assembly on one side of the mounting frame; and a protective buffer mechanism, which is located on one side of the mounting frame to provide protection and buffering for the steel wire spring assembly during use. The protective buffer mechanism includes a fastening ring fixedly installed inside the mounting frame, a buffer component on one side of the steel wire spring assembly, and a protective component between the mounting frame and the steel wire spring assembly.
[0005] The buffer assembly includes a storage shell fixedly installed inside the mounting bracket. One side of the wire spring assembly extends into the interior of the storage shell. A telescopic sleeve is slidably installed inside the storage shell, and multiple buffer blocks are fixedly installed inside the telescopic sleeve.
[0006] The buffer blocks are equidistantly distributed and are all set in a semi-circular shape. One side of the wire spring assembly abuts against one side of the telescopic sleeve.
[0007] Multiple springs are fixedly installed inside the storage shell, and one end of each spring is pressed against the other side of the telescopic sleeve.
[0008] The protective assembly includes a front protective plate fixedly installed on one side of the mounting bracket. The front protective plate has a trapezoidal cross-section and a transitional R-angle at its front end.
[0009] A bottom protective plate is fixedly installed at the bottom of the mounting bracket, and the wire spring assembly is located between the front protective plate and the bottom protective plate.
[0010] The wire spring assembly includes a wire mesh, main brush filaments, nylon brush filaments, and a sealing wire mesh. The wire mesh is located on one side of the front protective plate, and the main brush filaments are fixedly installed on the other side of the wire mesh. Nylon brush filaments are provided on the other side of the main brush filaments, and a sealing wire mesh is fixedly installed between the nylon brush filaments and the main brush filaments.
[0011] A gradient reinforcement block is fixedly installed on one side of the mounting bracket, and the other side of the gradient reinforcement block abuts against the outer side of the front protective plate.
[0012] Beneficial effects
[0013] 1. By setting up a buffer assembly to form a buffer extension area, the impact load at the tail of the wire spring assembly during retraction is effectively relieved, the stress concentration at the root is reduced, and the impact resistance and service life are significantly improved; the protective assembly enhances the structural stability of the mounting bracket and the wire spring assembly, effectively preventing displacement and damage, and ensuring the sealing performance and reliability of the sealing brush.
[0014] 2. The front protective plate provides effective protection for one side of the mounting frame. The front protective plate has a trapezoidal cross section and strong structural rigidity, which can withstand the impact load generated during the retreat of the tunnel boring machine or the assembly of the segments. Its front end is provided with a transition R-angle to effectively disperse the impact force, reduce stress concentration, avoid fatigue cracks at the plate end, and improve the overall durability and stability of the sealing brush. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0016] Figure 1 This is a schematic diagram of the main structure of this utility model;
[0017] Figure 2 This is a schematic diagram of the protective buffer mechanism of this utility model;
[0018] Figure 3 This is a schematic diagram of the internal structure of the mounting bracket of this utility model;
[0019] Figure 4This is a schematic diagram of the internal structure of the storage shell of this utility model;
[0020] Figure 5 This is a schematic diagram of the buffer component structure of this utility model.
[0021] Figure label:
[0022] 100. Mounting bracket; 200. Steel wire spring assembly; 210. Steel wire mesh; 220. Main brush bristles; 230. Nylon brush bristles; 240. Sealing wire mesh; 300. Protective buffer mechanism; 310. Fastening ring; 320. Buffer assembly; 321. Storage shell; 322. Telescopic sleeve; 323. Buffer block; 324. Spring; 330. Protective assembly; 331. Front protective plate; 332. Bottom protective plate; 333. Gradient reinforcement block. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.
[0024] The following is combined with Figures 1-5 This invention describes a shield tail sealing brush with a "transition R angle".
[0025] In one embodiment, a shield tail sealing brush with a "transition R-angle" includes: a mounting frame 100, on one side of which a wire spring assembly 200 is provided; a protective buffer mechanism 300, which is provided on one side of the mounting frame 100 to provide protective buffering for the wire spring assembly 200 during use; wherein the protective buffer mechanism 300 includes a fastening ring 310 fixedly installed inside the mounting frame 100, a buffer assembly 320 is provided on one side of the wire spring assembly 200, and a protective assembly 330 is provided between the mounting frame 100 and the wire spring assembly 200.
[0026] In this embodiment, by setting the buffer extension area formed by the buffer component 320, the impact load acting on the tail of the wire spring assembly 200 during the retraction process is effectively alleviated, the stress concentration at the root and connection is reduced, and the impact resistance and service life of the wire spring assembly 200 are significantly improved. The protective component 330 enhances the structural stability between the mounting bracket 100 and the wire spring assembly 200, effectively preventing the wire spring assembly 200 from shifting and being damaged due to the retraction force, and ensuring the overall sealing performance and reliability of the sealing brush.
[0027] It should be noted that existing shield tail sealing brushes typically include basic components such as mounting bracket 100, wire spring assembly 200, packing seal ring, brush spring clamping device, and lubrication and cleaning system;
[0028] Mounting bracket 100 serves as the support frame for the entire sealing brush, bearing and fixing the wire spring assembly 200 and related sealing components;
[0029] The wire spring assembly 200 consists of multi-layer spiral wire springs and composite brush filaments, providing elastic sealing and mud and sand interception functions; the packing seal ring is used to achieve static sealing and prevent mud and water leakage;
[0030] The clamping device ensures stable contact between the brush spring assembly and the shield tail ring seam, while the lubrication and cleaning system is used to extend the service life of the brush spring assembly and maintain the sealing effect.
[0031] The buffer assembly 320, serving as a buffer extension at the tail of the wire spring assembly 200, effectively disperses the recoil impact load and alleviates stress concentration through increasing plate thickness and a curved transition, without altering the elastic sealing function or overall structural form of the wire spring assembly 200. The protective assembly 330 enhances the structural stability between the mounting bracket 100 and the wire spring assembly 200, preventing displacement or loosening of the wire spring assembly 200 due to recoil impact, while simultaneously not interfering with the normal compression and sealing function of the brush spring.
[0032] like Figure 2 , Figure 3 and Figure 4 As shown, the buffer assembly 320 includes a storage shell 321 fixedly installed inside the mounting bracket 100. One side of the wire spring assembly 200 extends into the interior of the storage shell 321. A telescopic sleeve 322 is slidably installed inside the storage shell 321. Multiple buffer blocks 323 are fixedly installed inside the telescopic sleeve 322.
[0033] In this embodiment, the housing 321 effectively houses one side of the wire spring assembly 200, ensuring the stable positioning of the wire spring assembly 200. The telescopic sleeve 322 and the multiple buffer blocks 323 inside it can flexibly absorb and disperse the recoil impact energy, reduce the impact force directly transmitted to the root of the wire spring assembly 200, effectively alleviate stress concentration, and significantly improve the impact resistance and service life of the sealing brush.
[0034] Multiple buffer blocks 323 are equidistantly distributed, and all multiple buffer blocks 323 are set in a semi-circular shape. One side of the wire spring assembly 200 abuts against one side of the telescopic sleeve 322.
[0035] In this embodiment, multiple equally spaced and semi-circular buffer blocks 323 can uniformly disperse the impact force on the side of the wire spring assembly 200, avoid local stress concentration, and effectively protect the wire spring assembly 200 from damage.
[0036] Multiple springs 324 are fixedly installed inside the storage shell 321, and one end of each spring 324 is pressed against the other side of the telescopic sleeve 322.
[0037] In this embodiment, the spring 324 further absorbs and buffers the impact load acting on the telescopic sleeve 322 and the wire spring assembly 200 through its elastic deformation, effectively reducing the transmission intensity of the impact force, mitigating stress concentration, and improving the overall vibration and impact resistance of the sealing brush. The composite buffer structure of the spring 324 and the buffer block 323 realizes multi-level energy absorption and dispersion.
[0038] like Figure 2 , Figure 3 and Figure 5 As shown, the protective assembly 330 includes a front protective plate 331 fixedly installed on one side of the mounting bracket 100. The front protective plate 331 has a trapezoidal cross section and a transitional R-angle is provided at the front end of the front protective plate 331.
[0039] In this embodiment, the front protective plate 331 provides effective protection for one side of the mounting frame 100. The front protective plate 331 has a trapezoidal cross-section, strong structural rigidity, and can withstand the impact loads generated during the tunnel boring machine's retraction and segment assembly. Its front end is provided with a transition R-angle, which effectively disperses the impact force, reduces stress concentration, avoids fatigue cracks at the plate end, and improves the overall durability and stability of the sealing brush.
[0040] The bottom of the mounting bracket 100 is fixedly mounted with a bottom protection plate 332, and the wire spring assembly 200 is located between the front protection plate 331 and the bottom protection plate 332.
[0041] In this embodiment, the bottom protective plate 332 and the front protective plate 331, which are fixedly installed at the bottom of the mounting frame 100, together constitute the support and protection structure of the wire spring assembly 200. The wire spring assembly 200 is located between the two and is effectively wrapped and protected. The bottom protective plate 332 provides a robust bearing surface to prevent the wire spring assembly 200 from deforming or being damaged due to vertical loads or wear. At the same time, it works with the front protective plate 331 to disperse the multi-directional impact forces from the tunnel boring machine's retreat and segment assembly.
[0042] The wire spring assembly 200 includes a wire mesh 210, main brush filaments 220, nylon brush filaments 230, and a sealing wire mesh 240. The wire mesh 210 is located on one side of the front protective plate 331. The main brush filaments 220 are fixedly installed on the other side of the wire mesh 210. The nylon brush filaments 230 are provided on the other side of the main brush filaments 220. The sealing wire mesh 240 is fixedly installed between the nylon brush filaments 230 and the main brush filaments 220.
[0043] In this embodiment, the steel wire spring assembly 200 achieves multi-level sealing and protection functions through a layered structural design. The steel wire mesh 210 is located on one side of the front protective plate 331, serving as the first line of defense and effectively intercepting larger particles of mud, sand, and impurities. The main brush bristles 220 are fixedly installed on the other side of the steel wire mesh 210, possessing strong elasticity and wear resistance, further filtering fine particles and providing an elastic seal. The nylon brush bristles 230 are located on the other side of the main brush bristles 220, being soft and dense, and can closely fit the shield tail circumferential seam to block tiny particles. The sealing mesh 240 is fixedly installed between the nylon brush bristles 230 and the main brush bristles 220, forming a reinforced sealing layer and enhancing the overall sealing effect.
[0044] A gradient reinforcement block 333 is fixedly installed on one side of the mounting bracket 100, and the other side of the gradient reinforcement block 333 abuts against the outer side of the front protective plate 331.
[0045] In this embodiment, the gradient reinforcement block 333 closely abuts against the outer side of the front protection plate 331 to form a reinforced support structure, which enhances the bending and impact resistance of the root area of the front protection plate 331, significantly alleviates the stress concentration of backlash and impact loads at the root of the plate, and reduces the generation of fatigue cracks.
[0046] Working Principle: When the tunnel boring machine retracts or experiences segment assembly impact, the impact load first acts on the front protective plate 331. The front protective plate 331 has a trapezoidal cross-section with a transition radius (R-angle) at its front end, effectively dispersing the impact force, reducing stress concentration, and preventing fatigue cracks at the plate end. The bottom protective plate 332 at the bottom of the mounting frame 100, together with the front protective plate 331, wraps around the wire spring assembly 200, providing rigid support and collaboratively dispersing multi-directional impact forces, ensuring the structural integrity of the wire spring assembly 200. The buffer component 320 in the protective buffer mechanism 300 houses the tail of the wire spring assembly 200, the telescopic sleeve 322, and its internally equidistantly distributed semi-circular buffer blocks 323. Combined with the elastic deformation of the spring 324, multi-stage energy absorption and dispersion are achieved, effectively mitigating the transmission of impact load to the root of the wire spring assembly 200, reducing stress concentration, and improving the impact resistance and service life of the sealing brush. Meanwhile, the gradient reinforcement block 333 closely abuts against the outer side of the front protective plate 331, strengthening the structural rigidity and impact resistance of the plate root, further reducing stress concentration at the root, and preventing fatigue failure.
[0047] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. A shield tail seal brush with "transition R-angle" characterized in that, include: Mounting bracket (100), one side of which is provided with a wire spring assembly (200); A protective buffer mechanism (300) is provided on one side of the mounting bracket (100) for providing protective buffer when the wire spring assembly (200) is used. The protective buffer mechanism (300) includes a fastening ring (310) fixedly installed inside the mounting frame (100), a buffer component (320) is provided on one side of the wire spring assembly (200), and a protective component (330) is provided between the mounting frame (100) and the wire spring assembly (200).
2. The "transition R-angle" shield tail seal brush of claim 1 wherein, The buffer assembly (320) includes a storage shell (321) fixedly installed inside the mounting bracket (100). One side of the wire spring assembly (200) extends into the interior of the storage shell (321). A telescopic sleeve (322) is slidably installed inside the storage shell (321). Multiple buffer blocks (323) are fixedly installed inside the telescopic sleeve (322).
3. The "transition R-angle" shield tail seal brush of claim 2 wherein, The multiple buffer blocks (323) are equidistantly distributed, and the multiple buffer blocks (323) are all set in a semi-circular shape. One side of the wire spring assembly (200) abuts against one side of the telescopic sleeve (322).
4. The "transition R-angle" shield tail seal brush of claim 2 wherein, Multiple springs (324) are fixedly installed inside the storage shell (321), and one end of each spring (324) is pressed against the other side of the telescopic sleeve (322).
5. The "transition R-angle" shield tail seal brush of claim 1 wherein, The protective assembly (330) includes a front protective plate (331) fixedly installed on one side of the mounting bracket (100). The front protective plate (331) has a trapezoidal cross section and a transitional R-angle is provided at the front end of the front protective plate (331).
6. The "transition R-angle" shield tail seal brush of claim 1 wherein, The bottom of the mounting bracket (100) is fixedly mounted with a bottom protection plate (332), and the wire spring assembly (200) is located between the front protection plate (331) and the bottom protection plate (332).
7. The "transition R-angle" shield tail seal brush of claim 1 wherein, The wire spring assembly (200) includes a wire mesh (210), main brush filaments (220), nylon brush filaments (230), and a sealing wire mesh (240). The wire mesh (210) is located on one side of the front protective plate (331). The main brush filaments (220) are fixedly installed on the other side of the wire mesh (210). The nylon brush filaments (230) are provided on the other side of the main brush filaments (220). The sealing wire mesh (240) is fixedly installed between the nylon brush filaments (230) and the main brush filaments (220).
8. The "transition R-angle" shield tail seal brush of claim 1 wherein, A gradient reinforcement block (333) is fixedly installed on one side of the mounting bracket (100), and the other side of the gradient reinforcement block (333) abuts against the outer side of the front protective plate (331).