Gas cylinder protective cover and operation method thereof

Abstract

The embodiment of the invention provides a gas cylinder protective cover and an operation method thereof, and relates to the technical field of safety protection of high-pressure containers. The gas cylinder protective cover comprises a base, a guide mechanism and a protective cover body. The base is fixedly arranged and forms an inclined angle with the vertical direction. And the top of the guide mechanism is rotationally connected with the top of the base through a rotating shaft. The protective cover body is slidably connected with the guide mechanism. When acting force in the extending direction of the guide mechanism is applied to the protective cover body, the protective cover body can slide along the guide mechanism. When acting force perpendicular to the extending direction of the guide mechanism is applied to the protective cover body, the protective cover body and the guide mechanism can be turned upwards around the rotating shaft relative to the base to be lifted. Dual-mode cooperative work of daily automatic closing and emergency quick opening can be achieved, and the problems that the collision leakage risk of a gas cylinder is caused by the fact that a protective cover is not closed, and the emergency repair efficiency is low due to the fact that the protective cover is inconvenient to disassemble are solved.

Description

Technical Field

[0001] This invention relates to the field of high-pressure vessel safety protection technology, and more specifically, to a gas cylinder protective cover and its operating method. Background Technology

[0002] High-pressure gas cylinders are critical pressure vessels for storing flammable, explosive, or toxic gases, and the reliable protection of their valves is of paramount importance for safe production. Existing protection technologies suffer from two main drawbacks: insufficient safety and reliability, and poor operational convenience.

[0003] Currently, most widely used movable protective covers employ hinges and manual locking mechanisms. While these covers can be opened, their closing operation relies entirely on manual intervention. In frequent operations or emergency situations, operators are highly susceptible to forgetting or neglecting to close the cover, exposing the valve to collision risks and posing a serious safety hazard. Furthermore, the emergency opening of these covers is equally cumbersome and cannot meet the requirements for a second-level response in critical situations such as gas leaks. Summary of the Invention

[0004] The purpose of this invention is to provide a gas cylinder protective cover and its operation method, which can achieve dual-mode coordinated operation of automatic daily closure and rapid emergency opening, solving the risk of collision leakage caused by gas cylinders not being closed, and the problem of low emergency repair efficiency caused by the inconvenience of disassembling the protective cover.

[0005] The embodiments of the present invention can be implemented as follows: In a first aspect, the present invention provides a gas cylinder protective cover, comprising: The base is fixedly installed and inclined at an angle to the vertical direction; A guiding mechanism, the top of which is rotatably connected to the top of the base via a rotating shaft; The protective cover body is slidably connected to the guide mechanism; When a force is applied to the protective cover body along the extension direction of the guide mechanism, the protective cover body can slide along the guide mechanism; When a force perpendicular to the extension direction of the guide mechanism is applied to the protective cover body, the protective cover body, together with the guide mechanism, can rotate and lift upward relative to the base around the pivot.

[0006] In an optional embodiment, the base is tilted at an angle of 11°-14° to the vertical direction.

[0007] In an optional embodiment, a locking device is further provided between the guide mechanism and the base. When the locking device is in the locked state, it prevents the guide mechanism from rotating around the pivot. When the locking device is in the unlocked state, it allows the guide mechanism to rotate.

[0008] In an optional implementation, the locking device is a pin, a spring pin, or a clamp.

[0009] In an optional embodiment, the protective cover body and the guide mechanism are slidably connected by a rolling element.

[0010] In an optional embodiment, a magnetic adsorption element is provided at the bottom edge of the protective cover body.

[0011] In an optional embodiment, a handle is also provided at the bottom of the protective cover body.

[0012] In an optional embodiment, the protective cover body is provided with a counterweight cavity for adjusting the mass of the protective cover body.

[0013] In a second aspect, the present invention provides a method for operating a gas cylinder protective cover as described in the foregoing embodiments, comprising the following steps: In sliding mode: A force is applied to the protective cover body along the extension direction of the guide mechanism to push the protective cover body to slide upward along the guide mechanism to open; the gas cylinder is taken out or put in; when released, the protective cover body slides downward under the action of gravity to close automatically; In the flip mode: a force perpendicular to the extension direction of the guide mechanism is applied to the protective cover body, so that the protective cover body and the guide mechanism together flip up relative to the base to expose the accommodating space of the gas cylinder; the gas cylinder is taken out or put in; and then the protective cover body and the guide mechanism are lowered together.

[0014] In an optional implementation, the flipping mode operation further includes: before applying a force perpendicular to the extension direction of the guide mechanism to the protective cover body, releasing the locking device from locking the guide mechanism.

[0015] The beneficial effects of the gas cylinder protective cover and its operation method provided in the embodiments of the present invention include: 1. A protective cover structure with a fixed, inclined base and sliding connection achieves operator-free safety protection. This structure allows the protective cover to automatically slide down and reset under the influence of gravity along the inclined direction, thus achieving automatic closure. The protective cover automatically closes as soon as the operator releases their grip, avoiding valve exposure issues caused by forgetfulness or other human factors, and improving the safety and reliability of the protective cover.

[0016] 2. The structure, which rotatably connects the top of the guide mechanism to the base, provides an alternative emergency opening method. In case of emergency operation, no tools are needed for disassembly; simply changing the direction of force allows the protective cover and guide mechanism to be flipped and lifted as a whole, creating complete operating space. This reduces the disassembly process, which takes several minutes in traditional solutions, to a single-handed action that can be completed in seconds, increasing emergency response speed by dozens of times and gaining crucial time for accident handling.

[0017] 3. The switching between the sliding and flipping modes described above relies solely on applying forces in different directions to the same protective cover body, without requiring complex switching mechanisms or additional operating steps. This human-machine interaction method is intuitive, significantly reducing the learning and operational burden on operators. Furthermore, by eliminating complex mode-switching components, it also improves the mechanical reliability and service life of the entire system. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a structural schematic diagram of the gas cylinder protective cover provided in this embodiment from a first-view perspective; Figure 2 This is a structural schematic diagram of the gas cylinder protective cover provided in this embodiment from a second perspective.

[0020] Icons: 100-Gas cylinder protective cover; 10-Base; 11-U-shaped channel steel; 20-Guide mechanism; 21-C-shaped channel steel; 22-Rotating shaft; 30-Protective cover body; 31-T-shaped protrusion; 32-Handle; 33-Counterweight cavity; 34-Magnetic adsorption component; 200-Gas cylinder. Detailed Implementation

[0021] Gas cylinder protective covers in related technologies typically employ either a "top hinge + manual lock" or "simple guide rail + manual closure" solution. These solutions present two interconnected core problems: First, the closure of the protective cover relies entirely on manual operation, making it highly susceptible to forgetfulness or negligence during frequent operations or emergencies, resulting in the valve losing protection and posing a significant safety hazard. Second, their structural design only considers daily protection and neglects emergency needs. In the event of gas leaks or other emergencies, traditional protective covers are often difficult and time-consuming to disassemble, severely delaying repair time.

[0022] To address the aforementioned problems, this invention provides a gas cylinder protective cover and its operating method. Through its core structure of "rotatable connection between the top of the guide mechanism and the base" and "switching motion modes by changing the direction of applied force," it achieves coordinated operation in two modes: "automatic daily closing" and "rapid emergency flipping." In normal mode, the protective cover automatically slides down and closes along the inclined guide mechanism under gravity, thus completely eliminating the problem of valve exposure due to human error. In emergency mode, the protective cover, along with the guide mechanism, flips upwards, greatly improving the issues of slow emergency response and cumbersome operation, achieving a unified improvement in both safety and operational efficiency.

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention 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, and therefore should not be construed as a limitation of this invention.

[0027] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0028] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0029] The following describes in detail the overall structure, working principle, and technical effects of the gas cylinder protective cover provided by the present invention, as well as the detailed steps, implementation principles, and technical effects of the supporting operation method, through embodiments and in conjunction with the accompanying drawings.

[0030] Please refer to Figure 1 and Figure 2 The gas cylinder protective cover 100 provided by the present invention can be applied to scenarios such as hospital central oxygen supply stations, industrial welding workshops, and laboratory gas storage areas where high-pressure gas cylinders 200 exist and require frequent operation or rapid emergency response.

[0031] The gas cylinder protective cover 100 includes a base 10, a guide mechanism 20, and a protective cover body 30. The base 10 is fixedly installed and inclined at an angle to the vertical. The top of the guide mechanism 20 is rotatably connected to the top of the base 10 via a pivot 22. The protective cover body 30 is slidably connected to the guide mechanism 20. When a force is applied to the protective cover body 30 along the extension direction of the guide mechanism 20, the protective cover body 30 can slide along the guide mechanism 20. When a force is applied to the protective cover body 30 perpendicular to the extension direction of the guide mechanism 20, the protective cover body 30, together with the guide mechanism 20, can rotate and lift upward relative to the base 10 about the pivot 22.

[0032] Specifically, the base 10 is an inclined frame structure. The guide mechanism 20 is mounted on the base 10 and can be lifted relative to the base 10. Due to the inclined setting of the base 10, the guide mechanism 20 mounted on it is also inclined at the same angle, so that the protective cover body 30, which is slidably connected to the guide mechanism 20, can slide down stably and automatically along this inclined track under the action of the component of gravity.

[0033] Understandably, this gas cylinder protective cover 100 includes a daily use mode and an emergency start mode. In the daily use mode, the operator only needs to apply a pushing force to the protective cover body 30 along the direction of the guide mechanism 20 to easily push it up to retrieve or place the gas cylinder 200. After releasing the handle, the protective cover body 30 automatically slides down under the force of its own weight along the inclined base 10 until the bottom magnetic sealing strip is attracted and locked to the base 10. This achieves automated protection that is "ready to use immediately and easy to close when released," fundamentally eliminating the risk of valve exposure due to human error in forgetting to close the cover. In the emergency start mode, in the event of an emergency such as a gas leak, the operator applies an upward lifting force perpendicular to the guide mechanism 20 to the bottom of the protective cover body 30. This force is transmitted to the guide mechanism 20, causing the bottom of the guide mechanism 20 to be subjected to a pulling force perpendicular to the extension direction of the guide mechanism 20, and driving the entire protective cover body 30, together with the guide mechanism 20, to rotate upward around the top pivot 22. This allows the valve and pipeline operation area of ​​the gas cylinder 200 to be fully exposed within seconds, providing unprecedented convenience and rapid response capabilities for emergency repairs and solving the inherent problems of cumbersome disassembly and delays in traditional protective covers.

[0034] It is important to note that when an operator applies force to the protective cover body 30, the direction of the force does not need to be absolutely parallel or perpendicular to the extension direction of the guide mechanism 20. Those skilled in the art will understand that the aforementioned "force along the extension direction of the guide mechanism 20" and "force perpendicular to the extension direction of the guide mechanism 20" are essentially a functional classification, the core of which lies in the component relationship of the force along the extension direction of the guide mechanism 20. Specifically: when the component of the applied force along the extension direction of the guide mechanism 20 is dominant, that is, when this component is much greater than the component perpendicular to the direction of the guide mechanism 20, and thus sufficient to overcome sliding friction resistance and drive the protective cover body 30 to slide, it falls into the category of "force along the extension direction of the guide mechanism 20". Similarly, when the component of the applied force perpendicular to the direction of the guide mechanism 20 is dominant, and thus sufficient to overcome the self-gravity torque and rotational friction resistance of the guide mechanism 20, and drive the entire protective cover body 30 and guide mechanism 20 to flip and lift, it falls into the category of "force perpendicular to the extension direction of the guide mechanism 20".

[0035] Specifically, in this embodiment, the base 10 is tilted at an angle of 11°-14° to the vertical direction. The base 10 includes two parallel U-shaped channel steels 11. The guide mechanism 20 includes two C-shaped channel steels 21, with their openings facing each other and respectively accommodated within the channels of the U-shaped channel steels 11. T-shaped protrusions 31 that mate with the C-shaped channel steels 21 are provided on both sides of the protective cover body 30. The T-shaped protrusions 31 are embedded in the openings of the C-shaped channel steels 21, thereby enabling smooth sliding of the protective cover body 30 relative to the guide mechanism 20.

[0036] Specifically, in this embodiment, the protective cover body 30 and the guide mechanism 20 are slidably connected by rolling elements. The rolling elements are bearing balls. The bearing balls are disposed within the C-shaped channel steel 21 of the guide mechanism 20 and roll in cooperation with the T-shaped protrusion 31 of the protective cover body 30.

[0037] It should be noted that the U-shaped channel steel 11 not only provides space and a foundation for the C-shaped channel steel 21, but its specific tilt angle also provides a structural basis for the gravity-driven automatic closing function of the entire protective cover body 30. Through this tilt setting, the protective cover body 30 can obtain a downward component force along the extension direction of the C-shaped channel steel 21 under the action of gravity, ensuring the reliability of automatic closing in daily use.

[0038] Understandably, the base 10 is designed as a U-shaped channel steel 11 structure, and its open slot design allows the C-shaped channel steel 21 to be moved laterally out or inserted directly from the slot of the U-shaped channel steel 11 in emergency start-up mode. This structure enables the entire guide mechanism 20 and the protective cover body 30 to be flipped upward relative to the base 10.

[0039] Of course, in other embodiments, the base 10 and the guide mechanism 20 can adopt other structures, such as a combination of a plate frame and a guide rail: the base 10 can be composed of two parallel vertical steel plates, the guide mechanism 20 is two precision linear guide rails fixed to the inner side of the vertical steel plates, the protective cover body 30 is slidably connected to the linear guide rails through a slider, and the guide rails are separated from and lifted by an unlocking mechanism; or a combination of a round tube frame and a slider: the base 10 can be composed of a frame structure welded from round tubes, the guide mechanism 20 is an optical axis fixed to the frame, the protective cover body 30 is slidably engaged with the optical axis through a linear bearing, and the whole can be flipped with the base 10 through a hinge mechanism. As long as the protective cover body 30 can slide relative to the guide mechanism 20, and the protective cover body 30 and the guide mechanism 20 can rotate relative to the base 10, the present invention does not limit the structure of the base 10 and the guide mechanism 20.

[0040] Furthermore, to prevent the guide mechanism 20 from being lifted when the protective cover body 30 is pulled to slide during normal use, a locking device (not shown) is also provided between the guide mechanism 20 and the base 10 in this embodiment. When the locking device is in the locked state, it prevents the guide mechanism 20 from rotating around the pivot 22. When the locking device is in the unlocked state, it allows the guide mechanism 20 to rotate.

[0041] For example, in this embodiment, one specific implementation of the locking device includes a spring pin disposed on the guide mechanism 20 and a corresponding pin hole disposed on the base 10. When the spring pin is inserted into the pin hole, the locking device is in a locked state, which effectively prevents the guide mechanism 20 from rotating around the top pivot 22 through mechanical interference, ensuring the stability of the system during normal sliding operations. When it is necessary to switch to emergency mode, the locking device is unlocked by pulling out the spring pin driven by the manual or linkage mechanism, at which time the guide mechanism 20 can rotate freely around the pivot 22.

[0042] It is understood that the locking device can also employ equivalent structures such as pins, rotary latches, clamps, or eccentric cam pressing mechanisms to achieve the same locking function. These variations should all fall within the scope of protection of this invention. Through the design of this locking device, the reliability problem in dual-mode collaborative operation is perfectly solved, ensuring that the two functional modes do not interfere with each other.

[0043] Furthermore, in order to secure the gas cylinder 200, in this embodiment, the gas cylinder protective cover 100 also includes a chassis for supporting the bottom of the gas cylinder 200. The chassis is fixedly connected to the bottom of the base 10.

[0044] In this embodiment, a magnetic adsorption element 34 is provided at the bottom edge of the protective cover body 30. In normal use mode, when the protective cover body 30 slides to the closed position, the magnetic adsorption element 34 fits tightly against the chassis or the metal adsorption plate fixed on the base 10, forming a good adsorption seal. This design not only enhances the stability of the protective cover body 30 in the closed state and effectively resists minor external impacts, but also plays a certain role in dust prevention and preventing accidental opening, further optimizing the fixing effect of the gas cylinder 200 and the closing reliability of the protective cover.

[0045] To facilitate the application of force to the protective cover body 30 by the operator, a handle 32 is also provided at the bottom of the protective cover body 30 in this embodiment. By providing the handle 32, not only is the operational intensity significantly reduced, but more importantly, it provides the operator with a clear and stable point of force application, ensuring that the force can be effectively transmitted in the predetermined direction, thereby ensuring the accuracy and reliability of switching between the sliding and flipping modes.

[0046] Preferably, the handle 32 can be foldable, allowing it to be retracted when not in use to avoid interference. Specifically, the handle 32 is connected to the bottom of the protective cover body 30 via a hinge shaft, and has two states: folded for storage and unfolded for operation. In normal use mode, the operator can hold the unfolded handle 32 and easily push or pull the protective cover body 30 along the guide mechanism 20 to complete the opening and closing operations. In emergency start mode, pulling the handle 32 upwards applies a force perpendicular to the guide mechanism 20, triggering the linkage mechanism and causing the protective cover and guide mechanism 20 to flip and lift as a whole.

[0047] Furthermore, the protective cover body 30 is also provided with a counterweight cavity 33 for adjusting the mass of the protective cover body 30. The counterweight cavity 33 is a sealed structure with a pre-reserved cavity inside, and the overall mass of the protective cover body 30 can be adjusted by adding or removing counterweights (such as steel balls, lead blocks, etc.). By increasing the counterweight, it can be ensured that the protective cover body 30 obtains sufficient force on the guide mechanism 20 to overcome the frictional resistance of the track and achieve reliable automatic closing.

[0048] This invention provides an operating method for the gas cylinder protective cover 100 provided in the foregoing embodiments, specifically including the following steps: In sliding mode: when the protective cover body 30 is subjected to an action along the extension direction of the guide mechanism 20, the protective cover body 30 is pushed to slide upward along the guide mechanism 20 to open; the gas cylinder 200 is taken out or put in; when released, the protective cover body 30 slides downward under the action of gravity to close automatically.

[0049] In the flip mode: apply a force perpendicular to the extension direction of the guide mechanism 20 to the protective cover body 30, so that the protective cover body 30 together with the guide mechanism 20 flips and lifts upward relative to the base 10, exposing the accommodating space of the gas cylinder 200; take out or put in the gas cylinder 200; and then put the protective cover body 30 together with the guide mechanism 20 down.

[0050] Because of the dual-mode operation scheme based on force direction switching, intelligent switching between the two functional modes can be achieved with a single component, eliminating the need for complex mode switching mechanisms. This ensures automated safety protection that shuts off automatically when the device is removed during daily use, while also meeting the need for second-level rapid response in emergency situations. This fundamentally solves the technical contradiction in traditional protective devices where ease of operation and emergency efficiency are difficult to balance.

[0051] Furthermore, the flip-mode operation also includes: before applying a force perpendicular to the extension direction of the guide mechanism 20 to the protective cover body 30, the locking device is first released from the lock on the guide mechanism 20 so that the guide mechanism 20 can be flipped and lifted relative to the base 10.

[0052] Because of this step-by-step operation logic, namely "unlock first, then flip," a clear preparatory step ensures that the mechanism is in a safe operating state before performing the crucial flipping action. This effectively prevents damage or operational failure that might occur if force is applied while the mechanism is locked. Furthermore, by incorporating a locking device, it also prevents the guide mechanism 20 from being lifted due to accidental operation during normal use.

[0053] In summary, the beneficial effects of the gas cylinder protective cover 100 and its operation method provided in this embodiment of the invention include: 1. By using a fixed, inclined base 10 and a slidingly connected protective cover structure, operation-free safety protection is achieved. This structure allows the protective cover body 30 to automatically slide down and reset under the influence of the component of gravity along the inclined direction, thus achieving the effect of automatically closing the protective cover. As soon as the operator releases their grip, the protective cover automatically closes, avoiding valve exposure problems caused by human factors such as forgetfulness, and improving the safety and reliability of the protective cover.

[0054] 2. The structure of the top of the guide mechanism 20 being rotatably connected to the base 10 provides another emergency opening method. When emergency operation is required, no tools are needed for disassembly; simply by changing the direction of force, the protective cover and guide mechanism 20 can be flipped and lifted as a whole, creating complete operating space. This reduces the disassembly process, which takes several minutes in traditional solutions, to a single-handed action that can be completed in seconds, increasing emergency response speed by dozens of times and gaining crucial time for accident handling.

[0055] 3. The switching between the sliding and flipping modes described above relies solely on applying forces in different directions to the same protective cover body 30, without requiring complex switching mechanisms or additional operating steps. This human-machine interaction method is intuitive, significantly reducing the learning and operational burden on operators. Furthermore, by eliminating complex mode-switching components, it also improves the mechanical reliability and service life of the entire system.

[0056] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A protective cover for gas cylinders, characterized in that, include: The base is fixedly installed and inclined at an angle to the vertical direction; A guiding mechanism, the top of which is rotatably connected to the top of the base via a rotating shaft; The protective cover body is slidably connected to the guide mechanism; When a force is applied to the protective cover body along the extension direction of the guide mechanism, the protective cover body can slide along the guide mechanism; When a force perpendicular to the extension direction of the guide mechanism is applied to the protective cover body, the protective cover body, together with the guide mechanism, can rotate and lift upward relative to the base around the pivot.

2. The gas cylinder protective cover according to claim 1, characterized in that, The base is tilted at an angle of 11°-14° to the vertical direction.

3. The gas cylinder protective cover according to claim 1, characterized in that, A locking device is also provided between the guide mechanism and the base. When the locking device is in the locked state, it prevents the guide mechanism from rotating around the pivot. When the locking device is in the unlocked state, it allows the guide mechanism to rotate.

4. The gas cylinder protective cover according to claim 3, characterized in that, The locking device is a pin, a spring pin, or a clamp.

5. The gas cylinder protective cover according to claim 1, characterized in that, The protective cover body and the guide mechanism are slidably connected by a rolling element.

6. The gas cylinder protective cover according to claim 1, characterized in that, The bottom edge of the protective cover body is provided with a magnetic adsorption component.

7. The gas cylinder protective cover according to claim 1, characterized in that, The bottom of the protective cover is also equipped with a handle.

8. The gas cylinder protective cover according to claim 1, characterized in that, The protective cover body is provided with a counterweight cavity for adjusting the mass of the protective cover body.

9. A method for operating a gas cylinder protective cover as described in claim 3 or 4, characterized in that, Includes the following steps: In sliding mode: A force is applied to the protective cover body along the extension direction of the guide mechanism to push the protective cover body to slide upward along the guide mechanism to open; the gas cylinder is taken out or put in; when released, the protective cover body slides downward under the action of gravity to close automatically; In the flip mode: a force perpendicular to the extension direction of the guide mechanism is applied to the protective cover body, so that the protective cover body and the guide mechanism together flip up relative to the base to expose the accommodating space of the gas cylinder; the gas cylinder is taken out or put in; and then the protective cover body and the guide mechanism are lowered together.

10. The method according to claim 9, characterized in that, The flipping mode operation further includes: before applying a force perpendicular to the extension direction of the guide mechanism to the protective cover body, first releasing the locking device from locking the guide mechanism.

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