Over-displacement protection pipeline energy absorption flexible support

Abstract

The invention discloses an over-displacement protection pipeline energy absorption flexible support which comprises an over-displacement protector shell and an over-displacement protection pressing rod. An over-displacement energy-absorbing sleeve is arranged in the over-displacement protector shell, the inner wall of the upper side of the over-displacement energy-absorbing sleeve is of a frustum structure, the other part of the over-displacement energy-absorbing sleeve is of a straight pipe structure, a frustum protrusion is arranged at the lower end of the over-displacement protection pressing rod, the frustum protrusion is inserted into the frustum structure, and the over-displacement protection pressing rod is connected with the over-displacement energy-absorbing sleeve. The diameter of the upper end face of the frustum protrusion is larger than that of the lower end face of the frustum protrusion, the inner diameter of the straight pipe structure is smaller than that of the upper end face of the frustum protrusion, the inner diameter of the straight pipe structure is larger than that of the lower end face of the frustum protrusion, and the strength of the over-displacement protection pressing rod is larger than that of the over-displacement energy absorption sleeve. And constant-force support can be provided while the structure is deformed.

Description

Technical Field

[0001] The invention relates to a pipeline support, in particular to an energy-absorbing flexible support for over-displacement protection pipelines. Background Art

[0002] The pipeline system is one of the important engineering structures widely used in modern industry, and is widely used in thermal power generation, petrochemical and other fields. With the increase in electricity demand, increasingly severe energy security and environmental protection situations, my country's thermal power units are developing towards large-capacity, high-parameter supercritical and ultra-supercritical coal-fired units. This places higher demands on the safety and technical requirements of power generation equipment.

[0003] The patent with publication number CN113623347A discloses a sandwich thin-walled combined energy-absorbing structure, which is composed of a frustum, an inner expansion tube, a sandwich metal tube and an outer wall; wherein the frustum is a spiral body structure with a small bottom diameter and a middle diameter that gradually increases along a certain angle (angle range is between 15° and 45°); the inner expansion tube is a metal round tube with a diameter smaller than the maximum diameter of the frustum; the sandwich metal tubes are evenly arranged outside the inner expansion tube, and the round tubes are used as the sandwich structure; the outer wall is arranged outside the sandwich metal tube to limit the movement of the sandwich metal tube. When the frustum is working, it moves axially, causing the inner expansion tube with an inner diameter smaller than the outer diameter of the frustum to undergo radial expansion and deformation, and absorbs energy through its plastic deformation and the friction work between the frustum and the inner expansion tube. This plastic deformation buffer has been verified to have a stable buffering force and high buffering efficiency. The traditional expansion tube buffer is combined with the sandwich structure, and the expansion diameter plastic deformation of the expansion tube and the lateral compression plastic deformation of the sandwich metal tube are used at the same time, so as to improve the buffering force stability and energy absorption efficiency. Compared with the traditional method of filling foam metal in the expansion tube, the sandwich structure is arranged around the inner round tube. It will not shorten the buffer's action stroke while improving the energy absorption capacity. The sandwich thin-walled combined energy absorption structure can control the buffer force by changing the geometric parameters and materials of the cone, round tube, and sandwich metal tube. It has strong design, simple structure, convenient processing, and low cost. Through reasonable design, the buffer energy absorption structure can be used for overload protection of missile-borne equipment, train collision prevention, landing of landers, etc., effectively reducing the overload of the protected equipment under impact.

[0004] In order to solve the problem of fixing and supporting pipelines, it is necessary to equip the pipelines with support frames. However, the commonly used pipeline support frames on the market currently do not have shock-absorbing and buffering functions. When the pipelines are hit and vibrate, cracks or even breaks easily appear on the pipelines, and the pressure inside the pipelines is very high, which increases the danger of the pipelines and affects the safe operation of the pipelines.

[0005] Therefore, it is necessary to design a support that is suitable for energy absorption. The metal tube has high specific energy absorption capacity and controllable failure mode under axial pressure, and provides constant force support while the structure is deformed. It is an ideal energy absorption protection support. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide an over-displacement protection pipeline energy-absorbing flexible support, which has energy-absorbing characteristics and can provide constant force support while the structure is deformed.

[0007] In order to achieve the above-mentioned object, the present invention discloses an over-displacement protection pipeline energy-absorbing flexible support, comprising an over-displacement protector housing and an over-displacement protection pressure rod;

[0008] An over-displacement energy-absorbing sleeve is provided in the over-displacement protector shell, the inner wall of the upper side of the over-displacement energy-absorbing sleeve is a frustum structure, and the rest of the over-displacement energy-absorbing sleeve is a straight tube structure. A frustum protrusion is provided at the lower end of the over-displacement protection pressure rod, and the frustum protrusion is inserted into the frustum structure. The diameter of the upper end surface of the frustum protrusion is greater than the diameter of the lower end surface of the frustum protrusion, the inner diameter of the straight tube structure is smaller than the diameter of the upper end surface of the frustum protrusion, and the inner diameter of the straight tube structure is greater than the diameter of the lower end surface of the frustum protrusion. The strength of the over-displacement protection pressure rod is greater than the strength of the over-displacement energy-absorbing sleeve.

[0009] Furthermore, an over-displacement protector cover is provided at the top opening of the over-displacement protector housing.

[0010] Furthermore, a hole is opened on the top of the over-displacement protector cover plate, and the over-displacement protector cover plate is connected to the over-displacement protector housing by bolts.

[0011] Furthermore, the over-displacement protection pressure rod is marked with scales.

[0012] Furthermore, it also includes a support, and the over-displacement protector shell is fixed on the support.

[0013] The invention discloses an over-displacement protection pipeline energy-absorbing flexible support, comprising an over-displacement protector housing, an over-displacement protection pressure rod, a pipeline support and a pipe clamp;

[0014] An over-displacement energy-absorbing sleeve is provided in the over-displacement protector housing, the inner wall of the upper side of the over-displacement energy-absorbing sleeve is a frustum structure, the rest of the over-displacement energy-absorbing sleeve is a straight tube structure, a frustum protrusion is provided at the lower end of the over-displacement protection pressure rod, the frustum protrusion is inserted into the frustum structure, the diameter of the upper end face of the frustum protrusion is greater than the diameter of the lower end face of the frustum protrusion, the inner diameter of the straight tube structure is smaller than the diameter of the upper end face of the frustum protrusion, the inner diameter of the straight tube structure is greater than the diameter of the lower end face of the frustum protrusion, and the strength of the over-displacement protection pressure rod is greater than the strength of the over-displacement energy-absorbing sleeve;

[0015] The over-displacement protection pressure rod is fixed at the bottom of the pipe support, the pipe is fixed in the pipe clamp, and the pipe clamp is fixed at the top of the pipe support.

[0016] Furthermore, the pipe clamp is fixed with the pipe by bolts.

[0017] Furthermore, an over-displacement protector cover is provided at the top opening of the over-displacement protector housing.

[0018] Furthermore, the over-displacement protection pressure rod is marked with scales.

[0019] Furthermore, it also includes a support, and the over-displacement protector shell is fixed on the support.

[0020] The present invention has the following beneficial effects:

[0021] The over-displacement protection pipeline energy-absorbing flexible support described in the present invention provides support for the pipeline through the friction force generated by the over-displacement energy-absorbing sleeve and the over-displacement protection pressure rod during specific operation, and different support effects are obtained by adjusting the geometric dimensions and mechanical properties of the energy-absorbing material to meet the requirements of different loads. When the energy-absorbing flexible support is subjected to a static friction force greater than that between the over-displacement energy-absorbing sleeve and the over-displacement protection pressure rod, a relative displacement occurs between the over-displacement energy-absorbing sleeve and the over-displacement protection pressure rod, and the over-displacement protection pipeline energy-absorbing flexible support maintains a constant support force. At the same time, when no over-displacement in a specific direction occurs. In addition, under different working conditions, the displacement fluctuation at the fulcrum is large, and in extreme cases such as pipeline failure and damage, the over-displacement protection pipeline energy-absorbing flexible support can absorb the deformation energy of the pipeline, so that the abnormal deformation energy is released, and can better cope with the dynamic effect of pipeline rupture, and avoid the damage to other structures or components caused by the local transient dynamic load generated by the pipeline rupture. At the same time, in the stage of large structural deformation of the over-displacement protection pipeline energy-absorbing flexible hanger device, it can still maintain a constant working resistance and a stable deformation amount, thereby achieving pipeline stability and reducing safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 It is a structural diagram of the present invention.

[0024] Among them, 1 is a pipe, 2 is a pipe clamp, 3 is a bolt, 4 is a pipe support, 5 is an over-displacement protection pressure rod, 6 is an over-displacement protector cover, 7 is an over-displacement energy absorbing sleeve, 8 is an over-displacement protector shell, and 9 is a support. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0027] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0028] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0029] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0030] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0033] Embodiment 1

[0034] refer to Figure 1 The over-displacement protection pipeline energy-absorbing flexible support of the present invention comprises an over-displacement protector shell 8, an over-displacement protection pressure rod 5, a pipeline support 4 and a pipe clamp 2; an over-displacement energy-absorbing sleeve 7 is arranged in the over-displacement protector shell 8, the inner wall of the upper side of the over-displacement energy-absorbing sleeve 7 is a frustum structure, and the rest of the over-displacement energy-absorbing sleeve 7 is a straight tube structure, and a frustum protrusion is arranged at the lower end of the over-displacement protection pressure rod 5, the frustum protrusion is inserted into the frustum structure, the diameter of the upper end face of the frustum protrusion is greater than the diameter of the lower end face of the frustum protrusion, the inner diameter of the straight tube structure is smaller than the diameter of the upper end face of the frustum protrusion, the inner diameter of the straight tube structure is greater than the diameter of the lower end face of the frustum protrusion, and the strength of the over-displacement protection pressure rod 5 is greater than the strength of the over-displacement energy-absorbing sleeve 7; the over-displacement protection pressure rod 5 is fixed to the bottom of the pipeline support 4, the pipeline 1 is fixed in the pipe clamp 2, and the pipe clamp 2 is fixed to the top of the pipeline support 4. Specifically, the pipe clamp 2 is fixed to the pipeline 1 by bolts 3.

[0035] Embodiment 2

[0036] refer to Figure 1 The over-displacement protection pipeline energy-absorbing flexible support of the present invention comprises an over-displacement protector housing 8, an over-displacement protection pressure rod 5, a pipe clamp 2 and a support 9;

[0037] An over-displacement protector cover plate 6 is provided at the top opening of the over-displacement protector housing 8, and an over-displacement energy absorbing sleeve 7 is provided inside the over-displacement protector housing 8. The inner wall on the upper side of the over-displacement energy absorbing sleeve 7 is a frustum structure, and the rest of the over-displacement energy absorbing sleeve 7 is a straight tube structure. A frustum protrusion is provided at the lower end of the over-displacement protection pressure rod 5, and the diameter of the upper end surface of the frustum protrusion is greater than the diameter of the lower end surface of the frustum protrusion. The inner diameter of the straight tube structure is smaller than the diameter of the upper end surface of the frustum protrusion, and the inner diameter of the straight tube structure is greater than the diameter of the lower end surface of the frustum protrusion. The strength of the over-displacement protection pressure rod 5 is greater than the strength of the over-displacement energy absorbing sleeve 7, so that when the frustum protrusion moves inside the over-displacement energy absorbing sleeve 7, the shape of the frustum protrusion remains unchanged, and the over-displacement energy absorbing sleeve 7 undergoes elastic-plastic deformation.

[0038] A hole is opened on the top of the over-displacement protector cover plate 6 , and the over-displacement protector cover plate 6 is connected to the over-displacement protector housing 8 through bolts 3 .

[0039] An over-displacement energy absorbing sleeve 7 is arranged in the over-displacement protector housing 8 , the frustum protrusion at the lower end of the over-displacement protection pressure rod 5 is inserted into the over-displacement energy absorbing sleeve 7 , and the lower end of the over-displacement protection pressure rod 5 is close to the support 9 .

[0040] The over-displacement protection pressure rod 5 is marked with a scale for measuring the relative displacement between the over-displacement protection pressure rod 5 and the over-displacement protector housing 8, and further determining the displacement change at the pipeline support point.

[0041] The over-displacement protection pressure rod 5 is fixed below the pipeline support 4 .

[0042] The pipe clamp 2 is fixed to the pipe 1 by bolts 3 , and the pipe clamp 2 is fixed above the pipe support 4 .

[0043] The over-displacement protector housing 8 is fixed on the support 9 .

[0044] The design method of the over-displacement protection pipeline energy-absorbing flexible support of the present invention comprises the following steps:

[0045] The supporting load of the pipeline energy-absorbing flexible support for over-displacement protection is:

[0046] F N sinθ+fF N cosθ=F (1)

[0047] Among them, F N is the normal contact force between the frustum protrusion and the inner wall of the over-displacement energy absorbing sleeve 7, θ is the angle between the generatrix of the frustum protrusion and the normal line, f is the friction coefficient between the over-displacement protection pressure rod 5 and the inner wall of the over-displacement energy absorbing sleeve 7, and F is the support load.

[0048] Assuming that the total radial deformation of the over-displacement protection rod 5 and the over-displacement energy absorbing sleeve 7 is constant at Δd, and that the over-displacement energy absorbing sleeve 7 and the over-displacement protection rod 5 only undergo elastic deformation during the service of the hanger, it can be known that:

[0049]

[0050] Among them, E 1 is the elastic modulus of the displacement energy absorbing sleeve 7, E 2 is the elastic modulus of the displacement protection rod 5, D is the outer diameter of the displacement energy absorbing sleeve 7, σ N is the normal stress at a certain point in the contact area between the over-displacement energy absorbing sleeve 7 and the over-displacement protection pressure rod 5, A is the contact area between the over-displacement energy absorbing sleeve 7 and the over-displacement protection pressure rod 5, where Δd is a function of the generatrix of the frustum protrusion along the axial direction of the over-displacement protection pressure rod 5.

[0051] From formula (1), formula (2) and formula (3), it can be seen that the supporting force can be controlled by adjusting the material parameters of the casing rod and the geometric configuration of the frustum protrusion. Among them, the angle between the generatrix and the normal of the frustum protrusion should not be too large to avoid stress concentration on the casing wall and cause failure.

[0052] Embodiment 3

[0053] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the design method of the over-displacement protection pipeline energy-absorbing flexible support are implemented. The memory may include a memory, such as a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk memory, etc. The processor, the network interface, and the memory are interconnected through an internal bus. The internal bus may be an industrial standard architecture bus, a peripheral component interconnection standard bus, an extended industrial standard structure bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. The memory is used to store programs. Specifically, the program may include a program code, and the program code includes computer operation instructions. The memory may include a memory and a non-volatile memory, and provide instructions and data to the processor.

[0054] Embodiment 4

[0055] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the design method of the over-displacement protection pipeline energy-absorbing flexible support are implemented. Specifically, the computer-readable storage medium includes, but is not limited to, for example, a volatile memory and / or a non-volatile memory. The volatile memory may include a random access memory (RAM) and / or a cache memory (cache), etc. The non-volatile memory may include a read-only memory (ROM), a hard disk, a flash memory, an optical disk, a magnetic disk, etc.

[0056] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0057] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0058] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0059] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1The steps for the functions specified in one or more boxes.

[0060] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0061] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0062] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. An energy-absorbing flexible support for over-displacement protection pipeline, characterized in that: It comprises an over-displacement protector housing (8) and an over-displacement protection pressure rod (5); An over-displacement energy absorbing sleeve (7) is arranged inside the over-displacement protector housing (8); the inner wall of the upper side of the over-displacement energy absorbing sleeve (7) is a frustum structure; the rest of the over-displacement energy absorbing sleeve (7) is a straight tube structure; a frustum protrusion is arranged at the lower end of the over-displacement protection pressure rod (5); the frustum protrusion is inserted into the frustum structure; the diameter of the upper end face of the frustum protrusion is greater than the diameter of the lower end face of the frustum protrusion; the inner diameter of the straight tube structure is smaller than the diameter of the upper end face of the frustum protrusion; the inner diameter of the straight tube structure is greater than the diameter of the lower end face of the frustum protrusion; the strength of the over-displacement protection pressure rod (5) is greater than the strength of the over-displacement energy absorbing sleeve (7).

2. The over-displacement protection pipeline energy-absorbing flexible support according to claim 1 is characterized in that: An over-displacement protector cover plate (6) is provided at the top opening of the over-displacement protector housing (8).

3. The over-displacement protection pipeline energy-absorbing flexible support according to claim 1 is characterized in that: A hole is opened on the top of the over-displacement protector cover plate (6), and the over-displacement protector cover plate (6) is connected to the over-displacement protector housing (8) via bolts (3).

4. The over-displacement protection pipeline energy-absorbing flexible support according to claim 1 is characterized in that: The over-displacement protection pressure rod (5) is marked with scale.

5. The over-displacement protection pipeline energy-absorbing flexible support according to claim 1 is characterized in that: It also includes a support (9), and the over-displacement protector housing (8) is fixed on the support (9).

6. An energy-absorbing flexible support for over-displacement protection pipeline, characterized in that: It comprises an over-displacement protector housing (8), an over-displacement protection pressure rod (5), a pipe support (4) and a pipe clamp (2); An over-displacement energy absorbing sleeve (7) is provided in the over-displacement protector housing (8), the inner wall of the upper side of the over-displacement energy absorbing sleeve (7) is a frustum structure, the rest of the over-displacement energy absorbing sleeve (7) is a straight tube structure, the lower end of the over-displacement protection pressure rod (5) is provided with a frustum protrusion, the frustum protrusion is inserted into the frustum structure, the diameter of the upper end surface of the frustum protrusion is greater than the diameter of the lower end surface of the frustum protrusion, the inner diameter of the straight tube structure is smaller than the diameter of the upper end surface of the frustum protrusion, the inner diameter of the straight tube structure is greater than the diameter of the lower end surface of the frustum protrusion, and the strength of the over-displacement protection pressure rod (5) is greater than the strength of the over-displacement energy absorbing sleeve (7); The over-displacement protection pressure rod (5) is fixed below the pipeline support (4), the pipeline (1) is fixed inside the pipe clamp (2), and the pipe clamp (2) is fixed above the pipeline support (4).

7. The over-displacement protection pipeline energy-absorbing flexible support according to claim 6 is characterized in that: The pipe clamp (2) is fixed to the pipe (1) via bolts (3).

8. The over-displacement protection pipeline energy-absorbing flexible support according to claim 6 is characterized in that: An over-displacement protector cover plate (6) is provided at the top opening of the over-displacement protector housing (8).

9. The over-displacement protection pipeline energy-absorbing flexible support according to claim 6 is characterized in that: The over-displacement protection pressure rod (5) is marked with scale.

10. The over-displacement protection pipeline energy-absorbing flexible support according to claim 6, characterized in that: It also includes a support (9), and the over-displacement protector housing (8) is fixed on the support (9).

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