Hose assembly provided with protective sleeve

Abstract

The utility model relates to the technical field of fluid conveying pipelines, in particular to a hose assembly with a protective sleeve, which comprises a water inlet pipe joint, a hose is fixedly connected to the middle of the right end of the water inlet pipe joint, a water outlet pipe joint is fixedly connected to the other end of the hose, and mounting grooves are formed in the water inlet pipe joint and the water outlet pipe joint. Buffer devices are fixedly connected to the left part and the outer surface of the outer surface of the hose; a sleeving device sleeves the right part of the outer surface of the water inlet pipe joint and the left part of the outer surface of the water outlet pipe joint; the buffering device comprises a pressed sleeve body, and the pressed sleeve body is fixedly connected to the outer surface of the hose. According to the hose assembly provided with the protective sleeve, due to the collaborative design of the buffer device and the sleeving device, external force can be effectively dispersed and resisted, deformation of the protective sleeve is reduced, internal parts are protected, the protective capacity is enhanced to cope with severe environment impact, and the service life of the hose is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to fluid conveying pipeline technical field, especially relate to a hose assembly of setting protective sheath. BACKGROUND

[0002] In order to improve the performance and service life of hose, setting protective sheath is a common means, protective sheath can prevent external mechanical damage, however, the existing hose assembly of setting protective sheath still has some problems in practical application, protective sheath is short of protection ability when facing high strength, frequent external impact, cannot effectively protect internal hose, when conveying high pressure fluid, even if the sealing property of hose itself is good, but due to the sealing problem of connecting part, fluid can seep from the gap, not only causes fluid waste, but also can cause security risk, therefore, we launch a hose assembly of setting protective sheath. UTILITY MODEL CONTENTS

[0003] The utility model is mainly to provide a kind of hose assembly of setting protective sheath, can effectively solve the problems in the background art.

[0004] To achieve the above object, the technical scheme that the utility model adopts is as follows:

[0005] A kind of hose assembly of setting protective sheath, including water inlet pipe connector, the right end middle part of water inlet pipe connector is fixedly connected with hose, the other end of the hose is fixedly connected with water outlet pipe connector, installation slot is opened in the water inlet pipe connector and water outlet pipe connector, the outer surface left part of the hose and the outer surface are all fixedly connected with buffer device, the outer surface right part of water inlet pipe connector and the outer surface left part of water outlet pipe connector are jointly sleeved with sleeve device;

[0006] The buffer device includes pressure receiving sleeve body, the inner cavity of pressure receiving sleeve body is fixedly connected with several elastic layer strips, the outer surface of pressure receiving sleeve body is fixedly connected with spring seat, the spring seat is provided with six, buffer spring is fixedly connected between the upper seat wall and the lower seat wall of six spring seats, the buffer spring is provided with six, the outer side of six spring seats is fixedly connected with limit column, the inner sleeve wall of pressure receiving sleeve body is fixedly connected with several wear-resistant strips, the pressure receiving sleeve body is fixedly connected on the outer surface of hose.

[0007] Preferably, the sleeve device includes protective sheath, the outer surface of protective sheath is fixedly connected with several steel wire mesh, the left part and the right part of the inner sleeve wall of protective sheath are all opened with connecting groove, the connecting groove is fixedly connected with sealing pad, the middle part of the inner sleeve wall of protective sheath is fixedly connected with ceramic fiber layer, the protective sheath is sleeved on the outer surface right part of water inlet pipe connector and the outer surface left part of water outlet pipe connector.

[0008] By adopting the technical scheme, the water inlet pipe joint, the water outlet pipe joint and the connecting parts thereof and the hose are comprehensively protected, and the entire hose assembly can be ensured to stably operate in a complex environment.

[0009] Preferably, the sealing gasket has an annular structure, the outer circumference of which is tightly fitted with the groove wall of the connecting groove, and the inner circumference is tightly fitted with the right part of the outer surface of the water inlet pipe joint and the left part of the outer surface of the water outlet pipe joint, respectively.

[0010] By adopting the technical scheme, an effective sealing barrier is formed to prevent impurities such as dust and moisture from entering the connecting parts, prevent the connecting parts from rusting and corroding due to impurity erosion, and ensure the sealing performance and service life of the hose assembly.

[0011] Preferably, the steel wire mesh of the protective sleeve is uniformly distributed along the outer surface of the protective sleeve in the circumferential direction, and the steel wire mesh is tightly fitted with the outer surface of the protective sleeve.

[0012] By adopting the technical scheme, the uniformly distributed and tightly fitted steel wire mesh can comprehensively improve the strength of the protective sleeve.

[0013] Preferably, the mesh of the steel wire mesh is in a rhombic structure, and the long diagonal direction of the rhombus is parallel to the axial direction of the protective sleeve.

[0014] By adopting the technical scheme, the steel wire mesh can not only enhance the axial strength of the protective sleeve, but also to a certain extent, adapt to the bending deformation of the protective sleeve, optimize the protection performance, and compared with other mesh shapes, the rhombic mesh has an advantage in stress dispersion.

[0015] Preferably, the plurality of elastic layer strips are in a wave-shaped structure, the plurality of wear-resistant strips are arranged in a ring array at the center of the pressure-receiving sleeve body, and the plurality of wear-resistant strips are in an integrated structure with the pressure-receiving sleeve body.

[0016] By adopting the technical scheme, the wave-shaped elastic layer strips enhance the buffering capacity of the pressure-receiving sleeve body, can effectively absorb external impact force, the ring array and the integrated wear-resistant strips can protect the outer surface of the hose, prevent friction damage between the pressure-receiving sleeve body and the hose, and the integrated structure enhances the stability of the wear-resistant strips.

[0017] Preferably, the left and right side edges of the ceramic fiber layer are respectively equal in distance to the groove bottoms of the two connecting grooves.

[0018] By adopting the technical scheme, the ceramic fiber layer is uniformly distributed in the middle part of the protective sleeve, can evenly play the heat insulation performance in a high-temperature environment, effectively prevent heat from entering from the outside, and avoid performance damage of the water inlet pipe joint, the water outlet pipe joint and the hose due to high temperature.

[0019] Preferably, the other end surface of the plurality of limiting columns is tightly attached to the ceramic fiber layer, and the plurality of limiting columns are located at one half of the depth of the buffer spring.

[0020] By adopting the above technical scheme, the buffer spring is prevented from overstretching, and the stable operation of the buffer device is ensured.

[0021] Compared with the prior art, the utility model has the advantages of:

[0022] 1. In the utility model, the protection performance is improved by the buffer device and the sleeve connection device, the elastic layer strip in the pressure receiving sleeve has a wave shape structure and can preliminarily buffer the impact energy, the six spring seats on the outer surface and the connected buffer springs further weaken the impact force, the limiting columns limit the overstretching of the buffer spring, ensure the stable operation of the buffer device, at the same time, the wear-resistant strip on the inner wall of the pressure receiving sleeve protects the outer surface of the hose, the steel wire mesh on the outer surface of the protective sleeve of the sleeve connection device is evenly distributed and tightly attached, and by virtue of the diamond mesh structure and the specific direction, when external impact, extrusion and other mechanical forces are received, the external force can be effectively dispersed and resisted, the deformation of the protective sleeve is reduced, and the internal components are protected.

[0023] 2. In the utility model, the sleeve connection device plays a key role in sealing, the sealing gasket in the left and right connecting grooves in the inner sleeve wall of the protective sleeve is annular, the outer circumference is tightly attached to the connecting groove wall, the inner circumference is tightly attached to the right part of the outer surface of the water inlet pipe joint and the left part of the outer surface of the water outlet pipe joint respectively, and a reliable sealing barrier is formed. This design effectively prevents impurities such as dust and moisture from entering the connection part of the water inlet pipe joint, the water outlet pipe joint and the hose, avoids rust and corrosion of the connection part due to impurities, thereby ensuring that when high-pressure fluid is transported, fluid leakage does not occur due to the sealing problem of the connection part, and the sealing performance of the hose assembly is optimized.

[0024] 3. In the utility model, the ceramic fiber layer in the middle part of the inner sleeve wall of the protective sleeve significantly widens the application scenarios, the left and right side edges of the ceramic fiber layer are equidistant from the bottoms of the two connecting grooves, and are evenly distributed. When the hose assembly is in a high-temperature environment, the ceramic fiber layer can fully play its excellent heat insulation performance, effectively block the transmission of external heat, and prevent the water inlet pipe joint, the water outlet pipe joint and the hose from being damaged due to high temperature. This design makes the hose assembly no longer limited to a conventional temperature environment, meets the use requirements of more complex working conditions, and makes up for the limitations of the traditional hose assembly provided with a protective sleeve in terms of application scenarios. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a whole structure schematic view of the utility model of a kind of hose assembly provided with protective sleeve;

[0026] Figure 2This is a schematic diagram of the combined connection structure of a buffer device, a sleeve device, and a hose assembly with a protective sleeve according to the present invention.

[0027] Figure 3 This is a schematic diagram of the buffer device structure of a flexible hose assembly with a protective sleeve according to the present invention.

[0028] Figure 4 This is a schematic diagram of the connection device structure of a flexible hose assembly with a protective sleeve according to the present invention;

[0029] Figure 5 This is an enlarged structural diagram showing the details of section A of a flexible hose assembly with a protective sleeve according to this utility model.

[0030] In the diagram: 1. Inlet pipe connector; 2. Mounting groove; 3. Outlet pipe connector; 4. Connecting device; 5. Hose; 6. Buffer device; 61. Pressure-bearing sleeve; 62. Elastic layer strip; 63. Wear-resistant strip; 64. Limiting post; 65. Spring seat; 66. Buffer spring; 41. Protective sleeve; 42. Steel wire braided mesh; 43. Connecting groove; 44. Sealing gasket; 45. Ceramic fiber layer. Detailed Implementation

[0031] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0032] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] Please see Figure 1-5 This utility model provides a technical solution:

[0035] The soft pipe assembly with protective sleeve comprises a water inlet pipe joint 1, the middle part of the right end of the water inlet pipe joint 1 is fixedly connected with a soft pipe 5, the other end of the soft pipe 5 is fixedly connected with a water outlet pipe joint 3, the water inlet pipe joint 1 and the water outlet pipe joint 3 are both provided with an installation groove 2, the left part of the outer surface of the soft pipe 5 and the outer surface are both fixedly connected with a buffer device 6, and the right part of the outer surface of the water inlet pipe joint 1 and the left part of the outer surface of the water outlet pipe joint 3 are jointly sleeved with a sleeving device 4.

[0036] In the embodiment, the buffer device 6 comprises a pressure receiving sleeve body 61, the inner cavity of the pressure receiving sleeve body 61 is fixedly connected with a plurality of elastic layer strips 62, the outer surface of the pressure receiving sleeve body 61 is fixedly connected with spring seats 65, the spring seats 65 are provided in six, the upper seat wall and the lower seat wall between the six spring seats 65 are jointly fixedly connected with buffer springs 66, the buffer springs 66 are provided in six, the outer side of the six spring seats 65 is fixedly connected with limiting columns 64, the inner sleeve wall of the pressure receiving sleeve body 61 is fixedly connected with a plurality of wear-resistant strips 63, the pressure receiving sleeve body 61 is fixedly connected to the outer surface of the soft pipe 5, the plurality of elastic layer strips 62 are all in a wavy structure, the plurality of wear-resistant strips 63 are annularly arranged at the center of the pressure receiving sleeve body 61, and the plurality of wear-resistant strips 63 are all in an integral structure with the pressure receiving sleeve body 61, the other end surface of the plurality of limiting columns 64 is tightly combined with the ceramic fiber layer 45, and the plurality of limiting columns 64 are located at one half of the depth of the buffer springs 66.

[0037] Through the above scheme: in the hose 5 assembly provided with the protective sleeve 41, the buffer device 6 plays a key role. When the hose 5 encounters external impact, the elastic layer strips 62 in the wave-shaped structure in the compressed sleeve body 61 first contact and preliminarily buffer the impact energy. Since the wave-shaped structure has good elastic deformation capacity, it can absorb part of the impact force by bending and stretching itself, providing the first protection for the hose 5. Subsequently, the six spring seats 65 on the outer surface of the compressed sleeve body 61 and the six buffer springs 66 connected therebetween further play a role. The spring seats 65 provide stable support for the buffer springs 66. When the impact force is transmitted, the buffer springs 66 are compressed and deformed, converting the impact energy into elastic potential energy, greatly weakening the impact of the impact force on the hose 5. At the same time, the limiting column 64 penetrating the outer side of the spring seat 65 plays an important limiting role. The other end surface of the limiting column 64 is tightly attached to the ceramic fiber layer 45 and is located at one-half of the depth of the buffer spring 66. This makes the buffer spring 66 not overstretch during compression, avoiding damage due to excessive deformation of the spring, and ensuring that the buffer device 6 works stably and durably. In addition, the wear-resistant strips 63 in the compressed sleeve body 61, which are annularly arranged and integrated with the compressed sleeve body 61, are tightly attached to the outer surface of the hose 5, which can effectively prevent friction damage between the compressed sleeve body 61 and the hose 5 during daily use and impact, further protecting the outer surface of the hose 5. The beneficial effects brought by the buffer device 6 are significant. The multi-layer buffer structure, i.e., the cooperative work of the elastic layer strips 62 and the buffer springs 66, greatly enhances the protection capability of the hose 5, effectively coping with external impact under various complex working conditions, and prolonging the service life of the hose 5. The limiting design of the limiting column 64 on the buffer spring 66 improves the stability and reliability of the work of the buffer device 6. The integrated design of the wear-resistant strips 63 and the compressed sleeve body 61 enhances the stability of the wear-resistant strips 63, better protecting the outer surface of the hose 5, and ensuring that the entire hose 5 assembly can safely and stably operate in different environments.

[0038] In the embodiment, the sleeve connection device 4 comprises a protective sleeve 41, the outer surface of the protective sleeve 41 is fixedly connected with a plurality of steel wire woven nets 42, the left part and the right part of the inner sleeve wall of the protective sleeve 41 are both provided with a connecting groove 43, the two connecting grooves 43 are both fixedly connected with a sealing gasket 44, the middle part of the inner sleeve wall of the protective sleeve 41 is fixedly connected with a ceramic fiber layer 45, the protective sleeve 41 is sleeved on the right part of the outer surface of the water inlet pipe joint 1 and the left part of the outer surface of the water outlet pipe joint 3, the sealing gasket 44 is annular structure, the outer circumference of the sealing gasket 44 is tightly combined with the groove wall of the connecting groove 43, the inner circumference of the sealing gasket 44 is respectively tightly combined with the right part of the outer surface of the water inlet pipe joint 1 and the left part of the outer surface of the water outlet pipe joint 3, the steel wire woven nets 42 of the protective sleeve 41 are evenly distributed along the outer surface of the protective sleeve 41, and the steel wire woven nets 42 are tightly combined with the outer surface of the protective sleeve 41, the mesh of the steel wire woven net 42 is rhombic structure, and the long diagonal direction of the rhombus is parallel to the axial direction of the protective sleeve 41, the left and right side edges of the ceramic fiber layer 45 are respectively equal to the distance from the groove bottom of the two connecting grooves 43.

[0039] Through the above solution: In the hose assembly 5 with the protective sleeve, the protective sleeve 41 is fitted onto the right side of the outer surface of the inlet pipe connector 1 and the left side of the outer surface of the outlet pipe connector 3, achieving overall protection of the connection parts of the hose assembly 5. The steel wire braided mesh 42, which is evenly distributed and tightly fitted around the outer surface of the protective sleeve 41, has a diamond-shaped mesh structure that is parallel to the axial direction of the protective sleeve 41, providing strong structural strength for the protective sleeve 41. When the hose assembly 5 is subjected to external impacts, compression, or other mechanical forces, the steel wire braided mesh 42 can effectively disperse and resist these forces. External forces reduce the deformation of the protective sleeve 41 caused by stress, thereby protecting the internal water inlet pipe joint 1, water outlet pipe joint 3, and hose 5 connection points. The ceramic fiber layer 45 in the middle of the inner wall of the protective sleeve 41 has its left and right edges equidistant from the bottom of the two connecting grooves 43. During operation, if the environment where the hose 5 assembly is located is high-temperature, the ceramic fiber layer 45 can exert its good heat insulation performance, preventing heat from entering from the outside and preventing the water inlet pipe joint 1, water outlet pipe joint 3, and hose 5 from being damaged due to high temperature. The sealing gasket 44 in the connecting groove 43 on the left and right sides of the wall is an annular structure. Its outer circumference is tightly fitted with the groove wall of the connecting groove 43, and its inner circumference is tightly fitted with the right side of the outer surface of the inlet pipe connector 1 and the left side of the outer surface of the outlet pipe connector 3, forming a reliable sealing barrier. This sealing structure effectively prevents external dust, moisture and other impurities from entering the connection part of the inlet pipe connector 1, the outlet pipe connector 3 and the hose 5, avoiding rust and corrosion of the connection part due to impurities, which would affect the sealing performance of the hose 5 assembly. The steel wire braided mesh 42 significantly enhances the resistance of the protective sleeve 41 to mechanical damage, enabling the hose 5 to better resist external impacts in complex operating environments and ensuring the structural integrity of the entire pipeline system. The heat insulation design of the ceramic fiber layer 45 broadens the applicable scenarios of the hose 5 assembly, enabling it to work stably in high-temperature environments and improving the versatility of the product. The sealing effect of the sealing gasket 44 effectively protects the connection part, reduces the possibility of failure caused by impurities, reduces maintenance frequency and cost, and ensures that the entire hose 5 assembly can operate safely and stably in different environments.

[0040] It needs to be explained that the utility model discloses a kind of soft pipe 5 assembly of protective sleeve setting, in the soft pipe 5 assembly of the protective sleeve 41 setting, fluid flows from water inlet pipe joint 1, the mounting groove 2 in water inlet pipe joint 1 is used to be connected with soft pipe 5, ensure stable connection, fluid is transmitted by soft pipe 5, when soft pipe 5 is impacted by outside, the buffer device 6 of its outer surface left part and right part plays a role, the elastic layer strip 62 in the compression sleeve body 61 is in wave shape structure, can preliminary buffer impact, six spring seats 65 of the outer surface of compression sleeve body 61 and the buffer spring 66 connected therebetween further absorb impact force, limiting column 64 is through the outside of spring seat 65, and its other end surface is closely attached to ceramic fiber layer 45, located at the depth of buffer spring 66 one-half, limit buffer spring 66 overstretch, guarantee that buffer device 6 works stably, while the wear-resistant strip 63 of the inner sleeve wall of compression sleeve body 61 can protect the outer surface of soft pipe 5, in the outer surface right part of water inlet pipe joint 1 and the outer surface left part of water outlet pipe joint 3, sleeve device 4 provides protection and sealing, the steel wire woven net 42 of the outer surface of protective sleeve 41 is evenly distributed and closely attached in circumferential direction, and its mesh is in diamond structure, long diagonal direction is parallel to the axial direction of protective sleeve 41, enhances the strength of protective sleeve 41, the sealing pad 44 in the left and right connecting grooves 43 of the inner sleeve wall left part and right part of protective sleeve 41, outer circumference is closely attached to the groove wall of connecting groove 43, and inner circumference is closely attached to the outer surface right part of water inlet pipe joint 1 and the outer surface left part of water outlet pipe joint 3 respectively, prevent foreign matter from entering, the ceramic fiber layer 45 of the inner sleeve wall middle part of protective sleeve 41, the left and right two side edges are respectively equal to the distance from two connecting groove 43 groove bottom, can effectively insulate, finally, fluid flows from water outlet pipe joint 3, completes the whole transmission process, and each component works cooperatively, guarantees that soft pipe 5 assembly operates stably under different working conditions.

[0041] The basic principles and main features of the utility model and the advantages of the utility model are shown and described above. Those skilled in the art should understand that the utility model is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the utility model, and various changes and improvements can be made to the utility model without departing from the spirit and scope of the utility model. These changes and improvements all fall within the scope of the claimed utility model. The scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A hose assembly provided with a protective sleeve, comprising a water inlet pipe joint (1), characterized in that: The right end of the water inlet pipe joint (1) is fixedly connected with a hose (5), the other end of the hose (5) is fixedly connected with a water outlet pipe joint (3), the water inlet pipe joint (1) and the water outlet pipe joint (3) are both provided with an installation groove (2), the outer surface of the hose (5) is fixedly connected with a buffer device (6), and the outer surface of the water inlet pipe joint (1) and the outer surface of the water outlet pipe joint (3) are jointly sleeved with a sleeving device (4). The buffer device (6) comprises a pressure receiving sleeve (61), a plurality of elastic layer strips (62) are fixedly connected in the inner cavity of the pressure receiving sleeve (61), a spring seat (65) is fixedly connected to the outer surface of the pressure receiving sleeve (61), the spring seat (65) is provided with six, a buffer spring (66) is fixedly connected between the upper seat wall and the lower seat wall of the six spring seats (65), the buffer spring (66) is provided with six, a limiting column (64) is fixedly connected to the outer side of the six spring seats (65), a plurality of wear-resistant strips (63) are fixedly connected to the inner sleeve wall of the pressure receiving sleeve (61), and the pressure receiving sleeve (61) is fixedly connected to the outer surface of the hose (5).

2. A hose assembly provided with a protective jacket according to claim 1, characterized in that: The sleeving device (4) comprises a protective sleeve (41), a plurality of steel wire woven nets (42) are fixedly connected to the outer surface of the protective sleeve (41), a connecting groove (43) is formed in the left inner sleeve wall and the right inner sleeve wall of the protective sleeve (41), a sealing gasket (44) is fixedly connected in the two connecting grooves (43), a ceramic fiber layer (45) is fixedly connected to the middle inner sleeve wall of the protective sleeve (41), and the protective sleeve (41) is sleeved on the outer surface of the right end of the water inlet pipe joint (1) and the outer surface of the left end of the water outlet pipe joint (3).

3. A hose assembly provided with a protective jacket according to claim 2, characterized in that: The sealing gasket (44) is annular in structure, the outer circumference of the sealing gasket (44) is tightly attached to the groove wall of the connecting groove (43), and the inner circumference of the sealing gasket (44) is tightly attached to the outer surface of the right end of the water inlet pipe joint (1) and the outer surface of the left end of the water outlet pipe joint (3).

4. A hose assembly provided with a protective jacket according to claim 2, characterized in that: The steel wire woven nets (42) of the protective sleeve (41) are evenly distributed along the circumferential surface of the protective sleeve (41), and the steel wire woven nets (42) are tightly attached to the outer surface of the protective sleeve (41).

5. A hose assembly provided with a protective jacket according to claim 2, characterized in that: The mesh holes of the steel wire woven nets (42) are in a rhombic structure, and the long diagonal direction of the rhombus is parallel to the axial direction of the protective sleeve (41).

6. A hose assembly provided with a protective jacket according to claim 1, characterized in that: The plurality of elastic layer strips (62) are all in a wave shape structure, the plurality of wear-resistant strips (63) are arranged in an annular array at the center of the pressure receiving sleeve (61), and the plurality of wear-resistant strips (63) are in an integral structure with the pressure receiving sleeve (61).

7. A hose assembly provided with a protective jacket according to claim 2, characterized in that: The left and right side edges of the ceramic fiber layer (45) are respectively equal in distance to the groove bottoms of the two connecting grooves (43).

8. A hose assembly provided with a protective jacket according to claim 1, characterized in that: The other end surfaces of the plurality of limiting columns (64) are tightly attached to the ceramic fiber layer (45), and the plurality of limiting columns (64) are located at one half of the depth of the buffer spring (66).

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