Special cable suitable for extreme environment

Abstract

The application provides a special cable suitable for extreme environment, and relates to the technical field of special cables, which comprises an outer sheath, a cladding part, a clamp part, an anti-impact part, a plurality of reinforcing parts, an arc spring, a locking part, an arc horn, and an arc rod. The cladding part is located inside the outer sheath, the clamp part is arranged in the middle of the outer sheath, the clamp part further comprises a fixing seat, an arc sliding shell, an arc clamping shell and a rotating shaft, the arc clamping shell and the arc sliding shell are wrapped outside the outer sheath, the rotating shaft is rotatably inserted into one end of the arc clamping shell, the arc sliding shell is fixedly sleeved outside the rotating shaft, the locking part is arranged outside one end of the arc sliding shell away from the rotating shaft, and the fixing seat is fixedly installed above the arc clamping shell. The application can realize the whole-process protection of impact absorption, energy buffering and structure protection in extreme environments such as rockfall in mountainous areas, and the detachable clamp part design enables the whole cable to be replaced without being replaced when the local cable is damaged, thereby reducing the maintenance cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of special cables, in particular to a special cable suitable for extreme environments. BACKGROUND

[0002] Special cables are wires and cables with special properties and are used in specific environments or occasions. They are widely used in military, aerospace, petrochemical industry, nuclear power plants and rail transportation fields. The core characteristics include high temperature resistance (125-250℃ or higher), corrosion resistance, flame retardance, low smoke and halogen-free, etc. They are usually made of high-performance materials such as polyether sulfone (PES) and polyether ether ketone (PEEK). Some products can withstand temperatures above 1000℃ or extreme deep-sea environments.

[0003] The main categories include high-temperature-resistant cables, low-inductance cables, low-noise cables, fireproof cables and mineral-insulated cables, etc. For example, control cables for nuclear power plants use irradiation cross-linked flame-retardant materials, low-noise cables suppress signal interference through structural optimization, and CMP flame-retardant cables meet the highest fireproof standards. High-temperature superconducting cables become an important option for urban power grid reconstruction due to their low loss characteristics, and environmentally friendly products meet the demand for green energy.

[0004] Cables used in power transmission projects in steep mountainous environments face two major challenges:

[0005] The threat of random rockfall (rockfall rolling down steep slopes, impacting the cable with high energy, easily causing the sheath to break, sharp debris to penetrate the insulation layer, causing a short circuit, and the metal armor layer in the prior art to deform, resulting in a decrease in electrical conductivity);

[0006] When the cable is rigidly connected to the tower and is impacted by rockfall, the shock wave is transmitted along one end of the cable to the connected tower interface, causing the bolts to loosen. In the mountains of uninhabited areas, the maintenance of this cable is only once a year. If the conventional coating is increased, not only will the overall weight of the cable increase, making it difficult to install the support in steep areas, but also if the cable surface is damaged, the entire section needs to be disassembled and replaced, which will be a huge project. Therefore, in order to protect the cable connected to the tower from being safely set, the problem needs to be solved. SUMMARY

[0007] In order to solve the problem of cable damage caused by rockfall impact when the tower is connected to the cable in the extreme environment of the mountainous area, the present application provides a special cable suitable for extreme environments.

[0008] The technical solutions provided by the embodiments of the present application are as follows:

[0009] The application provides a special cable suitable for extreme environment, which comprises an outer sheath, a cladding part, a clamp part, an anti-impact part, a plurality of reinforcing parts, an arc spring, a locking part, an arc horn, and an arc rod.

[0010] The cladding part is located inside the outer sheath, and the clamp part is arranged in the middle of the outer sheath.

[0011] The clamp part further comprises a fixing seat, an arc sliding shell, an arc clamp shell, and a rotating shaft.

[0012] The arc clamp shell and the arc sliding shell are wrapped outside the outer sheath, the rotating shaft penetrates into one end of the arc clamp shell, the arc sliding shell is fixedly sleeved outside the rotating shaft, the locking part is arranged outside one end of the arc sliding shell away from the rotating shaft, the fixing seat is fixedly installed above the arc clamp shell, arc horns are symmetrically arranged on both sides of the arc clamp shell, a sliding push block is slidably installed in the arc horn, and the sliding push block is connected with the anti-impact part through the symmetrically installed connecting rods on both sides of the sliding push block.

[0013] The anti-impact part comprises an arc anti-impact shell and a plurality of rain blocking strips.

[0014] The arc anti-impact shell is fixedly connected with the connecting rods on the same side, and the plurality of rain blocking strips are arranged at equal distances in the horizontal direction outside the arc anti-impact shell.

[0015] The arc anti-impact shell comprises a three-layer composite structure, an impact-resistant outer layer, a lightweight high-strength base layer, and an energy absorption layer.

[0016] In the above technical solution, further, the cladding part comprises a cladding sleeve and a plurality of wire cores.

[0017] The plurality of wire cores are clamped at equal distances in the circumferential direction inside the cladding sleeve, and the plurality of reinforcing parts are arranged at equal distances in the horizontal direction outside the cladding sleeve.

[0018] In the above technical solution, further, the plurality of reinforcing parts comprise a plurality of buffer trapezoidal shells, a protective sleeve, and a plurality of buffer columns.

[0019] The plurality of buffer trapezoidal shells are arranged at equal distances in the circumferential direction at one end outside the protective sleeve, the protective sleeve is fixedly sleeved inside the outer sheath away from the buffer trapezoidal shells, the buffer trapezoidal shells are fixedly connected with the outer surface of the cladding sleeve away from the protective sleeve, and the plurality of buffer columns are arranged at equal distances in the circumferential direction inside the corresponding buffer trapezoidal shells.

[0020] In the above technical solution, further, the locking portion includes two sets of retaining seats, two sets of locking screws, two sets of retaining platforms, and two sets of retaining blocks;

[0021] The two groups of the said seats are respectively fixedly mounted on the outer walls on both sides of the arc-shaped housing and away from the end of the rotating shaft, the two groups of the said blocks are respectively fixedly mounted on both sides of the outside of the arc-shaped sliding housing, the two groups of the said platforms are respectively fixedly connected to the corresponding blocks, and the two groups of the said locking screws are threaded through the corresponding seats and the inside of the platforms in sequence.

[0022] In the above technical solution, further, the arc rod is arranged on the inner side of the arc corner shell, and the sliding block slides outside the arc rod.

[0023] In the above technical solution, further, the arc spring is fixedly arranged on the outside of the arc rod, and both ends of the arc spring are respectively connected to the outside of the sliding block and the arc angle shell on a side close to each other.

[0024] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include at least:

[0025] In the present invention, a clamp portion, an impact-resisting portion, a reinforcement portion, and a locking portion are used to protect the cable connected to the tower in the extreme environment of mountain cliffs.

[0026] The impact force of falling rocks is transmitted to the arc spring through the arc-shaped impact shell, connecting rod and sliding block, and the vertical impact kinetic energy is converted into elastic energy storage of the spring and energy unloading of the rotation of the arc plate. The inclined surface can avoid falling rocks, and then it is automatically reset by the arc spring. There is a gap between the impact part and the covering part, which can fully consume the impact of falling rocks. At the same time, the clamp part can be installed on the outside of the cable in a lightweight manner, reducing the traditional covering weight. If damage occurs due to the impact of falling rocks, the corresponding structure can be disassembled separately to avoid the problem of replacing the entire section. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 A schematic structural diagram of a special cable suitable for use in extreme environments provided by an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of the disassembled inner portion of a special cable suitable for use in extreme environments provided by an embodiment of the present invention;

[0030] Figure 3A schematic diagram of the connection structure between a clamp portion and a locking portion of a special cable suitable for use in extreme environments provided by an embodiment of the present invention;

[0031] Figure 4 A schematic diagram of the connection structure between the impact-resistant portion and the arc-shaped corner shell of a special cable suitable for use in extreme environments provided by an embodiment of the present invention;

[0032] Figure 5 A schematic diagram of the connection structure between an arc-shaped spring and an arc-shaped angle shell of a special cable suitable for use in extreme environments provided by an embodiment of the present invention;

[0033] Figure 6 The embodiment of the present invention provides a special cable suitable for extreme environments Figure 2 A in the middle is an enlarged structural diagram;

[0034] Figure 7 The embodiment of the present invention provides a special cable suitable for extreme environments Figure 4 Enlarged structural diagram at point B in the middle.

[0035] [Reference Signs]

[0036] 1-outer sheath; 2-coating part; 201-coating sheath; 202-wire core; 3-clamp part; 301-fixing seat; 302-arc sliding shell; 303-arc clamping shell; 304-rotating shaft; 4-anti-impact part; 401-arc anti-impact shell; 402-rain shield; 5-reinforcement part; 501-buffer trapezoidal shell; 502-protective sheath; 503-buffer column; 6-arc spring; 7-locking part; 701-retaining seat; 702-locking screw; 703-retaining platform; 704-retaining block; 8-arc corner shell; 9-sliding block; 10-arc rod; 11-connecting rod; 12-impact-resistant outer layer; 13-lightweight and high-strength matrix layer; 14-energy absorption layer.

[0037] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0038] The technical solutions of the present invention are described below with reference to the accompanying drawings. It is also noted that, to provide a more detailed description, the following embodiments are best and preferred embodiments, and those skilled in the art may employ alternative implementations for certain known technologies. Furthermore, the accompanying drawings are intended only to provide a more detailed description of the embodiments and are not intended to limit the present invention.

[0039] It should be noted that references in the specification to "one embodiment," "an embodiment," "exemplary embodiments," "some embodiments," etc. indicate that the described embodiments may include specific features, structures, or characteristics, but not necessarily every embodiment will include such specific features, structures, or characteristics. Furthermore, when specific features, structures, or characteristics are described in conjunction with an embodiment, it is within the knowledge of persons skilled in the relevant art to implement such features, structures, or characteristics in conjunction with other embodiments (whether or not explicitly described).

[0040] In general, terms can be understood, at least in part, from their use in context. For example, depending at least in part on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending at least in part on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0041] It will be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” means not only “directly on” something but also includes the meaning of being “on” something with intervening features or layers, and “on” or “above” means not only “on” or “above” something but also includes the meaning of being “on” or “above” something with no intervening features or layers.

[0042] Additionally, spatially relative terms such as "below," "beneath," "lower," "above," and "upper" may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as illustrated in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein should be similarly interpreted accordingly.

[0043] like Figures 1 to 7 As shown, the embodiment of the present invention provides a special cable suitable for use in extreme environments, comprising: an outer sheath 1, a covering portion 2, a clamp portion 3, an anti-resistance portion 4, a plurality of reinforcement portions 5, an arc spring 6, a locking portion 7, an arc angle shell 8, and an arc rod 10;

[0044] The covering portion 2 is located inside the outer sleeve 1, and the clamp portion 3 is arranged in the middle of the outer sleeve 1;

[0045] The clamp portion 3 further includes a fixing seat 301, an arc-shaped sliding shell 302, an arc-shaped clamping shell 303, and a rotating shaft 304;

[0046] The arc-shaped clamping shell 303 and the arc-shaped sliding shell 302 are wrapped outside the outer sleeve 1, the rotating shaft 304 is rotatably inserted into one end of the arc-shaped clamping shell 303, the arc-shaped sliding shell 302 is fixedly sleeved outside the rotating shaft 304, the locking part 7 is arranged outside one end of the arc-shaped sliding shell 302 away from the rotating shaft 304, the fixed seat 301 is fixedly installed above the arc-shaped clamping shell 303, the arc-shaped corner shells 8 are symmetrically arranged on both sides of the arc-shaped clamping shell 303, the sliding push block 9 is slidably installed inside the arc-shaped corner shell 8, and the sliding push block 9 is connected with the anti-impact part 4 through the symmetrically-installed connecting rods 11 on both sides of the sliding push block 9.

[0047] The outer sleeve 1 is made of PEEK material and covers the entire cable core, thereby playing the roles of insulation, waterproofness and corrosion resistance.

[0048] The cladding part 2 is located inside the outer sleeve 1 and is a conductive core of the cable.

[0049] The clamping part 3 is used for detachably mounting the anti-impact part 4, the reinforcing part 5 and other components outside the outer sleeve 1.

[0050] Specifically, when the rockfall impacts the cable, the impact force is first applied to the anti-impact part 4 and is transmitted to the sliding push block 9 through the connecting rods 11; the sliding push block 9 slides along the arc-shaped rod 10 to the inside of the arc-shaped corner shell 8, compresses the arc-shaped spring 6, and converts the kinetic energy of the rockfall into the elastic potential energy of the spring in a buffering process; after the impact ends, the arc-shaped spring 6 releases energy, the sliding push block 9 resets, and the anti-impact part 4 is driven to return to the initial position. At the same time, the clamping part 3 disperses the impact force to the outer sleeve 1 through the wrapping structure of the arc-shaped sliding shell 302 and the arc-shaped clamping shell 303, so as to avoid local stress concentration and breakage.

[0051] In a possible implementation, the cladding part 2 includes a cladding sleeve 201 and a plurality of groups of wire cores 202.

[0052] The plurality of groups of wire cores 202 are equidistantly clamped inside the cladding sleeve 201 in a circumferential direction, and the plurality of groups of reinforcing parts 5 are equidistantly arranged outside the cladding sleeve 201 in a horizontal direction.

[0053] The cladding sleeve 201 is made of cross-linked polyethylene material and plays the role of insulation.

[0054] The wire core 202 serves as a conductive carrier to transmit power, and the cladding sleeve 201 isolates the wire core 202 through insulation performance to prevent short circuit.

[0055] In a possible implementation, the plurality of groups of reinforcing parts 5 include a plurality of buffer trapezoidal shells 501, a protective sleeve 502 and a plurality of buffer columns 503.

[0056] The outer ends of the plurality of buffer trapezoidal shells 501 are arranged equidistantly in the circumferential direction on the inner surface of the sheath 502, the sheath 502 is fixedly sleeved on the inner surface of the outer sleeve 1 away from the buffer trapezoidal shells 501, the plurality of buffer trapezoidal shells 501 are fixedly connected to the outer surface of the cladding sleeve 201 away from the sheath 502, and the plurality of buffer columns 503 are arranged equidistantly in the circumferential direction in the corresponding buffer trapezoidal shells 501;

[0057] The buffer trapezoidal shells 501 are made of elastic polyurethane material and have a trapezoidal cross section, and can absorb radial impact force through deformation of the buffer columns 503; the sheath 502 is made of high-strength glass fiber reinforced plastic, and can wrap the outside of the buffer trapezoidal shells 501 to uniformly transmit the dispersed impact force to the outer sleeve 1; and the buffer columns 503 are made of hard rubber material, and can enhance the compression resistance of the buffer trapezoidal shells 501.

[0058] Specifically, when external impact such as rockfall lateral force acts on the outer sleeve 1, the force is transmitted to the buffer trapezoidal shells 501 through the sheath 502; the buffer trapezoidal shells 501 are extruded to deform, and the internal buffer columns 503 are synchronously compressed, so as to jointly convert the impact energy into elastic deformation energy and reduce the impact force transmitted to the cladding part 2.

[0059] In a possible implementation, the anti-impact part 4 includes an arc-shaped anti-impact shell 401 and a plurality of groups of rainproof strips 402.

[0060] The outer wall of the arc-shaped anti-impact shell 401 is fixedly connected to the two connecting rods 11 on the same side, and the plurality of groups of rainproof strips 402 are arranged equidistantly on the outer side of the arc-shaped anti-impact shell 401 in the horizontal direction. In a possible implementation, the arc-shaped anti-impact shell 401 includes a three-layer composite structure, the outer layer is an impact-resistant outer layer 12 composed of a plasma sprayed silicon carbide coating, the middle layer is a lightweight high-strength base layer 13 composed of carbon fiber reinforced composite material, and the inner layer is an energy absorption layer 14 composed of microporous titanium alloy material.

[0061] The main body of the arc-shaped anti-impact shell 401 is arc-shaped and directly bears the impact of rockfall, and the three-layer composite structure respectively plays an anti-impact performance from the outer layer, the middle layer and the inner layer.

[0062] The material of the outer layer is resistant to wear and tear and puncture by sharp objects.

[0063] The middle layer ensures the structural rigidity and has tensile resistance.

[0064] The inner layer absorbs impact energy through micropore collapse.

[0065] Specifically, when the rockfall hits, it first hits the rain deflector 402, and part of the energy is released by breaking the rain deflector 402; the remaining impact force is borne by the arc-shaped impact-resistant shell 401: the outer layer of silicon carbide coating resists sharp impact and prevents the main shell from being scratched; the middle layer of carbon fiber reinforced structure resists deformation and prevents the main shell from breaking; the inner layer of microporous titanium alloy absorbs residual energy through microporous compression deformation.

[0066] In one possible implementation, the locking part 7 includes two sets of abutments 701, two sets of locking screws 702, two sets of abutment tables 703, and two sets of abutment blocks 704.

[0067] The two sets of abutments 701 are fixedly installed on the outer walls of the two sides of the arc-shaped clamping shell 303 away from the rotating shaft 304, the two sets of abutment blocks 704 are fixedly installed on the outer sides of the arc-shaped sliding shell 302, the two sets of abutment tables 703 are fixedly connected with the corresponding abutment blocks 704, and the two sets of locking screws 702 are threaded through the interiors of the corresponding abutments 701 and abutment tables 703 in sequence.

[0068] In one possible implementation, the arc-shaped rod 10 is arranged inside the arc-shaped corner shell 8, and the sliding block 9 slides on the outside of the arc-shaped rod 10.

[0069] Specifically, the arc-shaped sliding shell 302 is rotated around the rotating shaft 304 to wrap the outer sleeve 1, the abutments 701 are aligned with the abutment tables 703, the locking screws 702 are tightened to make the abutments 701 tightly fit the abutment tables 703, a friction force is generated to fix the positions of the abutments 701 and the abutment tables 703, and the clamping part 3 is ensured not to loosen during impact, and the quick-release module is also provided to replace the related parts after wear.

[0070] In one possible implementation, the arc-shaped spring 6 is fixedly arranged on the outside of the arc-shaped rod 10, and the two ends of the arc-shaped spring 6 are connected with the outer sides of the arc-shaped corner shell 8 and the sliding block 9 that are close to each other.

[0071] The curvature of the arc-shaped rod 10 is consistent with the curvature inside the arc-shaped corner shell 8, and the two ends of the arc-shaped rod 10 are fixedly arranged inside the arc-shaped corner shell 8 as the movement track of the sliding block 9. The middle part of the sliding block 9 is provided with an arc-shaped hole matched with the arc-shaped rod 10, and the sliding block 9 is sleeved on the outside of the arc-shaped rod 10 to limit the sliding of the sliding block 9 along the arc-shaped track and avoid horizontal movement.

[0072] Specifically, when the rockfall hits, the sliding block 9 slides along the arc-shaped rod 10 to compress the arc-shaped spring 6 and store energy through elastic deformation; after the impact ends, the elastic potential energy of the spring is released to push the sliding block 9 to slide reversely and drive the impact-resistant part 4 to reset to the initial position.

[0073] To sum up, the special cable designed by the application is suitable for extreme environment, and the special cable can realize the whole-process protection of "impact absorption, energy buffering and structure protection" under the extreme environment such as rockfall in mountainous areas, the impact resistance of the special cable is effectively improved compared with the traditional cable, the detachable clamp part 3 is designed, so that the whole cable does not need to be replaced when the local cable is damaged, the maintenance cost is greatly reduced, and the cable can be greatly applied when connected with the tower power transmission project.

[0074] The present application encompasses any alternatives, modifications, equivalent methods and solutions made to the essence and scope of the present application. In order to make the public have a thorough understanding of the present application, specific details are described in the preferred embodiments of the present application, and the present application can also be fully understood without the description of these details to those skilled in the art. In addition, in order to avoid unnecessary confusion to the essence of the present application, well-known methods, processes, procedures, elements and circuits are not described in detail.

[0075] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should be considered as the protection scope of the present application.

Claims

1. A special cable suitable for use in extreme environments, characterized in that: include: An outer sleeve, a covering portion, a clamp portion, an impact-resisting portion, several groups of reinforcement portions, an arc spring, a locking portion, an arc angle shell, and an arc rod; The covering portion is located inside the outer sleeve, and the clamp portion is arranged in the middle of the outer sleeve; The clamp part also includes a fixing seat, an arc-shaped sliding shell, an arc-shaped clamping shell, and a rotating shaft; The arc-shaped card shell and the arc-shaped sliding shell are wrapped around the outside of the outer sleeve, the rotating shaft is rotatably inserted into the inside of one end of the arc-shaped card shell, the arc-shaped sliding shell is fixedly sleeved on the middle of the outside of the rotating shaft, the locking portion is arranged on the outside of the arc-shaped sliding shell and away from the end of the rotating shaft, the fixing seat is fixedly installed above the outside of the arc-shaped card shell, arc-shaped angle shells are symmetrically arranged on both sides of the outside of the arc-shaped card shell, and a sliding block is slidably installed inside the arc-shaped angle shell, and the two sides of the outside of the sliding block are connected to the anti-resistance part through symmetrically installed connecting rods; The anti-skid portion includes an arc-shaped anti-skid shell and a plurality of groups of rainproof strips; One side of the outer wall of the arc-shaped anti-vibration shell is fixedly connected to two connecting rods on the same side, and a plurality of groups of rain shield strips are arranged at equal distances along the horizontal direction on the outer side of the arc-shaped anti-vibration shell; The arc-shaped impact shell comprises a three-layer composite structure, the outer layer is an impact-resistant outer layer, which is composed of a plasma-sprayed silicon carbide coating, the middle layer is a lightweight and high-strength matrix layer, which is composed of a carbon fiber reinforced composite material, and the inner layer is an energy absorption layer, which is composed of a microporous titanium alloy material; The covering portion includes a covering sleeve and a plurality of groups of wire cores; Several groups of the wire cores are clamped inside the covering sleeve at equal distances in the circumferential direction, and several groups of the reinforcement parts are arranged outside the covering sleeve at equal distances in the horizontal direction; Several groups of the reinforcement parts include several buffer trapezoidal shells, protective sleeves, and several buffer columns; The outer ends of several buffer trapezoidal shells are arranged at equal distances along the circumferential direction on the inner surface of the protective sleeve, the side of the protective sleeve away from the buffer trapezoidal shell is fixedly sleeved inside the outer sleeve, the side of several buffer trapezoidal shells away from the protective sleeve is fixedly connected to the outer surface of the covering sleeve, and several buffer columns are arranged at equal distances along the circumferential direction inside the corresponding buffer trapezoidal shells; The arc rod is arranged on the inner side of the arc angle shell, and the sliding block slides outside the arc rod; The arc spring is fixedly arranged on the outside of the arc rod, and both ends of the arc spring are respectively connected to the outside of one side of the sliding block and the arc angle shell that are close to each other.

2. A special cable suitable for use in extreme environments according to claim 1, characterized in that: The locking part includes two sets of seats, two sets of locking screws, two sets of platforms and two sets of blocks; The two groups of the said seats are respectively fixedly mounted on the outer walls on both sides of the arc-shaped housing and away from the end of the rotating shaft, the two groups of the said blocks are respectively fixedly mounted on both sides of the outside of the arc-shaped sliding housing, the two groups of the said platforms are respectively fixedly connected to the corresponding blocks, and the two groups of the said locking screws are threaded through the corresponding seats and the inside of the platforms in sequence.

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