Fence and lifting equipment

Abstract

The present invention relates to the technical field of safety protection. The present invention provides a fence and a lifting device. Among them, the fence includes: a support assembly and an adjustment assembly. The support assembly defines a protection platform. The support assembly includes a first bracket and a second bracket that forms an angle with and is connected to the first bracket; the adjustment assembly includes a third bracket and a fourth bracket that forms an angle with the third bracket. The third bracket is adapted to be adjusted between a first support position supported above the first bracket and a first covering position covering the protection platform, and the fourth bracket is adapted to be adjusted between a second support position supported above the second bracket and a second covering position covering the protection platform. At least one of the third bracket and the fourth bracket is provided with a self-locking member. When the third bracket is in the first support position and the fourth bracket is in the second support position, the self-locking member fixedly connects the third bracket and the fourth bracket. The fence provided by the present invention has an adjustable fence structure, which is convenient for equipment maintenance and makes the equipment operate stably.

Description

Technical Field

[0001] The present invention relates to the technical field of safety protection, and particularly to a fence and a lifting device. Background Art

[0002] With the development of the national economy, there are more and more working conditions where various materials (such as garbage and sludge) are stored in the same workshop for production. Different material characteristics (such as specific gravity, particle size, and viscosity, etc.) require different forms and specifications of grapples to complete the material grabbing task. When sludge and garbage are stored in the same workshop, a lifting device has been developed in which the sludge grab hoisting mechanism is side-hung to the garbage grab trolley. Due to the requirement for the operating space of the sludge grab, it is necessary to cancel the platform on the driving side of the original garbage crane, but it is difficult to repair and maintain the driving mechanism. Summary of the Invention

[0003] The present invention provides a fence to solve the defects of low safety during the operation of the existing lifting device and inconvenient repair and maintenance. An adjustable fence structure is adopted to facilitate equipment inspection and maintenance, so that the lifting device operates safely and stably.

[0004] The present invention provides a fence, including:

[0005] A support assembly that defines a protection platform, including a first bracket and a second bracket that forms an angle with and is connected to the first bracket;

[0006] An adjustment assembly, including a third bracket and a fourth bracket that forms an angle with the third bracket. The third bracket is adapted to adjust between a first support position above the first bracket and a first covering position covering the protection platform, and the fourth bracket is adapted to adjust between a second support position above the second bracket and a second covering position covering the protection platform. At least one of the third bracket and the fourth bracket is provided with a self-locking member. When the third bracket is in the first support position and the fourth bracket is in the second support position, the self-locking member fixedly connects the third bracket and the fourth bracket.

[0007] According to a fence provided by the present invention, the self-locking member is rotatably connected to at least one of the third bracket and the fourth bracket, and the self-locking member is provided as an eccentric structure so that the self-locking member automatically connects the third bracket and the fourth bracket under the action of eccentricity.

[0008] According to a fence provided by the present invention, the self-locking member is provided with a plugging portion, and at least one of the third bracket and the fourth bracket is provided with a plugging hole adapted to the plugging portion.

[0009] According to a fence provided by the present invention, the self-locking member includes a first rod portion and a second rod portion. One end of the first rod portion is rotatably connected to the third bracket or the fourth bracket. The second rod portion is connected to the other end of the first rod portion and is provided with the insertion portion. The outer wall of the second rod portion fits against the outer wall of the first rod portion to form an eccentric structure.

[0010] According to a fence provided by the present invention, at least one of the third bracket and the fourth bracket is provided with a first support portion and a second support portion juxtaposed with the first support portion. The first support portion is rotatably connected to the first rod portion, and the second rod portion is snap-fitted inside the second support portion.

[0011] According to a fence provided by the present invention, the third bracket is rotatably connected to the first bracket, and the fourth bracket is rotatably connected to the second bracket.

[0012] According to a fence provided by the present invention, a trigger member is provided on one of the support assembly and the adjustment assembly, and a detection sensor for detecting the position of the trigger member is provided on the other.

[0013] According to a fence provided by the present invention, the detection sensor is a limit switch. When the third bracket is in the first covering position and / or the fourth bracket is in the second covering position, the trigger member abuts against the limit switch.

[0014] According to a fence provided by the present invention, the trigger member is provided on the third bracket. The trigger member includes a connecting portion fixed to the third bracket, a bending portion forming an angle with the connecting portion, and a triggering portion for triggering the limit switch. The triggering portion forms an angle with the bending portion.

[0015] According to a lifting device provided by the present invention, it includes a beam body and the above-mentioned fence, and the fence is located on one side of the beam body.

[0016] The fence provided by the present invention includes a support assembly and an adjustment assembly. The support assembly defines a protection platform. The adjustment assembly can be used to adjust the covering state of the protection platform and the support height of the fence. When the third bracket and the fourth bracket of the adjustment assembly are in the covering position, the protection platform is sealed to prevent personnel from entering the protection platform, thereby avoiding accidental injury to personnel by the operating equipment and improving the safety of equipment operation. At the same time, when the third bracket and the fourth bracket are in the support position, the third bracket and the fourth bracket support above the support assembly, playing a role in increasing the height of the fence. Increasing the height of the fence can also protect the personnel inside the protection platform. Among them, adjusting the height of the fence to the height of the support assembly can provide sufficient space for equipment operation. After the fence is heightened, it can also prevent equipment operation and improve the safety of maintenance. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 is a front view structural schematic diagram of the fence provided by the present invention;

[0019] Figure 2 is a side view structural schematic diagram of the fence provided by the present invention;

[0020] Figure 3 is a top view structural schematic diagram of the fence provided by the present invention;

[0021] Figure 4 is a top view structural schematic diagram of the third support of the fence provided by the present invention;

[0022] Figure 5 is a top view structural schematic diagram of the self-locking member on the third support of the fence provided by the present invention;

[0023] Figure 6 is a top view structural schematic diagram of the main frame body of the third support of the fence provided by the present invention;

[0024] Figure 7 is a side view structural schematic diagram of the first support portion of the third support of the fence provided by the present invention;

[0025] Figure 8 is a side view structural schematic diagram of the second support portion of the third support of the fence provided by the present invention;

[0026] Figure 9 is a side view structural schematic diagram of the trigger member on the third support of the fence provided by the present invention;

[0027] Figure 10 is a side view structural schematic diagram of the fourth support of the fence provided by the present invention;

[0028] Figure 11 is a structural schematic diagram of the second support of the fence provided by the present invention;

[0029] Figure 12 is a side view structural schematic diagram of the first support of the fence provided by the present invention;

[0030] Figure 13 is a three-dimensional structural schematic diagram of a partial position of the fence provided by the present invention; among them, both the third support and the fourth support are in a supporting state.

[0031] Reference Signs:

[0032] 1. Support assembly; 11. First bracket; 12. Second bracket; 2. Adjustment assembly; 21. Third bracket; 211. Trigger member; 2111. Connection portion; 2112. Bending portion; 2113. Trigger portion; 212. Main frame body; 213. Self-locking member; 2131. First rod portion; 2132. Second rod portion; 2133. Insertion portion; 214. First hinge; 215. First support portion; 216. Second support portion; 22. Fourth bracket; 221. Second hinge; 3. Detection sensor; 31. Mounting support; 4. Main beam; 5. End beam. Detailed Embodiment

[0033] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0034] The following combines Figures 1 to 13 Describe an embodiment of the present invention. The present invention provides a fence, including: a support assembly 1 and an adjustment assembly 2. The support assembly 1 defines a protection platform. The support assembly 1 includes a first bracket 11 and a second bracket 12 that forms an angle with and is connected to the first bracket 11; the adjustment assembly 2 includes a third bracket 21 and a fourth bracket 22 that forms an angle with the third bracket 21. The third bracket 21 is adapted to be adjusted between a first support position supported above the first bracket 11 and a first covering position covering the protection platform, and the fourth bracket 22 is adapted to be adjusted between a second support position supported above the second bracket 12 and a second covering position covering the protection platform. A self-locking member 213 is provided on the third bracket 21. When the third bracket 21 is in the first support position and the fourth bracket 22 is in the second support position, the self-locking member 213 fixedly connects the third bracket 21 and the fourth bracket 22.

[0035] The support assembly 1 extends in the height direction to define a protection platform, that is, both the first bracket 11 and the second bracket 12 extend in the height direction. Refer to Figure 13 As shown, the adjustment assembly 2 cooperates with the support assembly 1 to adjust the height of the fence. That is, when the third bracket 21 is in the first support position, the height of the fence can be increased by the cooperation of the first bracket 11 and the third bracket 21. When the fourth bracket 22 is in the second support position, the height of the fence can be increased by the cooperation of the second bracket 12 and the fourth bracket 22; Refer to Figures 1 to 3As shown, when the third support 21 is in the first covering position, the height on the side where the first support is located drops to the height of the first support 11. When the fourth support 22 is in the second covering position, the height on the side where the second support is located drops to the height of the second support 12, realizing the adjustment of the fence height.

[0036] When maintenance is not required, the state of the adjustment assembly 2 can be adjusted (both the third support 21 and the fourth support 22 are in the covering position) to lower the height of the fence, avoiding interference of the fence with the operation of other equipment. At the same time, the adjustment assembly 2 covers the protection platform, preventing staff from staying on the protection platform and also avoiding staff from accidentally entering the protection platform, which can improve the safety of maintenance. At this time, the equipment can operate normally; when maintenance is required, the state of the adjustment assembly 2 is adjusted again (both the third support 21 and the fourth support 22 are in the supporting position) to increase the height of the fence, so that the height of the fence meets the safety requirements and fully protects the maintenance staff. At this time, the staff can enter the protection platform for maintenance and the equipment stops running to prevent the equipment from hitting the staff.

[0037] Moreover, the self-locking member 213 can realize the automatic locking of the third support 21 and the fourth support 22, which can simplify the operation of the staff and help improve the safety of maintenance. The included angle between the third support 21 and the fourth support 22 can be mutually limited to avoid the third support 21 and the fourth support 22 from injuring the staff on the protection platform. The self-locking member 213 can be arranged on the third support 21 or the fourth support 22 to ensure the fixation of the third support 21 and the fourth support 22; or, the self-locking member 213 is arranged on both the third support 21 and the fourth support 22 at the same time, which can perform two-stage locking, making the fixation of the third support 21 and the fourth support 22 more stable.

[0038] Combined Figure 3 and Figure 4 As shown, taking the self-locking member 213 arranged on the third support 21 as an example for illustration. When both the third support 21 and the fourth support 22 are in the supporting position, the self-locking member 213 on the third support 21 automatically locks the third support 21 and the fourth support 22, without the need for staff operation, the operation is more convenient, and there will be no situation of injuring the staff due to the failure to manually lock the third support 21 and the fourth support 22.

[0039] Among them, the shape of the protection platform can be rectangular, circular or other shapes, and the shape of the protection platform is not limited. The included angle range between the first support 11 and the second support 12 is between 0° and 180°. The included angle range between the third support 21 and the fourth support 22 is the same as the included angle range between the first support 11 and the second support 12. When the shape of the protection platform can be rectangular, the included angle between the first support 11 and the second support 12 is 90°.

[0040] Of course, the number of the first support 11 and the second support 12 of the support component 1 is not limited to one. According to the different shapes of the protection platform, the number and shape of the first support 11 and the second support 12 can be adjusted. In addition, when there are multiple first supports 11 and / or second supports 12, the third support 21 is arranged on at least one first support 11, and the fourth support 22 is arranged on at least one second support 12. The number of each support can be adjusted as needed.

[0041] In the fence of this embodiment, the height of the fence can be adjusted by adjusting the position of the adjusting component 2. The adjustment is simple and flexible. The third support 21 and the fourth support 22 of the adjusting component 2 are automatically locked by the self-locking member 213, which can simplify the operation and avoid potential hazards caused by the staff forgetting to lock, thereby improving the safety of the fence.

[0042] The following provides an embodiment of the self-locking member 213.

[0043] In one embodiment, referring to Figure 3 、 Figure 4 、 Figure 5 and Figure 13 shown, the self-locking member 213 is rotatably connected to at least one of the third support 21 and the fourth support 22. The self-locking member 213 is provided with an eccentric structure so that the self-locking member 213 automatically connects the third support 21 and the fourth support 22 under the eccentric action. When the third support 21 is in the first support position and the fourth support 22 is in the second support position, the self-locking member 213 rotates under the action of gravity of the eccentric structure and rotates to the position where the third support 21 and the fourth support 22 are locked.

[0044] When the self-locking member 213 is connected to the third support 21, first adjust the fourth support 22 to the second support position, and then open the third support 21 from the first covering position to the first support position. That is, during the process of the third support 21 moving from the horizontal direction to the vertical direction, when the third support 21 is vertically placed, the self-locking member 213 automatically rotates downward under the action of gravity and is fixedly connected to the fourth support 22.

[0045] Among them, the fixing method of the self-locking member 213 and the fourth support 22 can be clamping, magnetic attraction or plugging, etc. When the self-locking member 213 is clamped to the fourth support 22, the fourth support 22 is provided with a clamping portion for clamping the self-locking member 213; when the self-locking member 213 is magnetically fixed to the fourth support 22, a magnet can be arranged in the self-locking member 213, and the fourth support 22 is made of a ferromagnetic material; when the self-locking member 213 is plugged with the fourth support 22, the self-locking member 213 and the fourth support 22 need to be provided with a matching plugging structure.

[0046] Of course, the self-locking member 213 can also be arranged on the fourth bracket 22. When the self-locking member 213 is arranged on the fourth bracket 22, the third bracket 21 is first adjusted to the first support position. The specific method can refer to the above content and will not be elaborated here. When the self-locking members 213 are arranged on both the third bracket 21 and the fourth bracket 22, the order of adjusting the third bracket 21 and the fourth bracket 22 to the support position does not need to be limited. Whether the third bracket 21 or the fourth bracket 22 is supported first, it can be locked by the self-locking member 213 on the other bracket, and the operation is more flexible.

[0047] In one embodiment, referring to Figures 3 to 5 As shown, the self-locking member 213 is provided with a plug-in portion 2133, and at least one of the third bracket 21 and the fourth bracket 22 is provided with a plug-in hole adapted to the plug-in portion 2133. The plug-in portion 2133 and the plug-in hole are plugged and fixed to each other, with stable fixation and simple structure. Referring to Figure 5 As shown, the plug-in portion 2133 is a rod-shaped structure, and the plug-in hole is adapted to the plug-in portion 2133, with a simple structure and convenient processing, which helps to reduce the cost of the fence.

[0048] In one embodiment, referring to Figures 3 to 5 As shown, the self-locking member 213 includes a first rod portion 2131 and a second rod portion 2132. One end of the first rod portion 2131 is rotatably connected to the third bracket 21, the second rod portion 2132 is connected to the other end of the first rod portion 2131 and is provided with the plug-in portion 2133, and the outer wall of the second rod portion 2132 fits against the outer wall of the first rod portion 2131 to form an eccentric structure. By the cooperation of the first rod portion 2131 and the second rod portion 2132 to form an eccentric structure, the self-locking member 213 can be automatically locked, with a simple structure and convenient processing.

[0049] Referring to Figure 5 As shown, the first rod portion 2131 and the second rod portion 2132 have the same structure, and the first rod portion 2131 and the second rod portion 2132 cooperate to form an eccentric structure. The axis of the first rod portion 2131 is parallel to the axis of the second rod portion 2132, and the axes of the first rod portion 2131 and the second rod portion 2132 are both inclined relative to the horizontal direction, so that when the third bracket 21 is in the first support position, the self-locking member 213 falls under the action of gravity. Among them, the plug-in portion 2133 is a rod structure, with convenient processing and accurate plugging.

[0050] The following provides embodiments of the third bracket 21 and / or the fourth bracket 22.

[0051] In one embodiment, at least one of the third bracket 21 and the fourth bracket 22 is provided with a first support portion 215 and a second support portion 216 juxtaposed with the first support portion 215. The self-locking member 213 is rotatably connected to the first support portion 215, and in the closed state, the self-locking member 213 is held fixed by the support of the second support portion 216. The structure is simple and the connection is stable.

[0052] Wherein, when the self-locking member 213 includes a first rod portion 2131 and a second rod portion 2132, the first support portion 215 is rotatably connected to the first rod portion 2131, and the second rod portion 2132 is snap-fitted within the second support portion 216. The installation of the self-locking member 213 is simple and can also ensure the stability of the self-locking member 213. In order to incline the self-locking member 213 relative to the horizontal direction, the length of the second support portion 216 can be greater than the length of the first support portion 215, so that the self-locking member 213 inclines away from the first support portion 215 and the second support portion 216.

[0053] The connection manner of the self-locking member 213 on the third bracket 21 and the fourth bracket 22 can be the same. In the following embodiments, the case where the self-locking member 213 is connected to the third bracket 21 is taken as an example for illustration.

[0054] Combined Figures 3 to 8 As shown, the third bracket 21 includes a main frame body 212. The first support portion 215 and the second support portion 216 are juxtaposed and connected to the main frame body 212. The first support portion 215 is provided with a pin hole, and the first rod portion 2131 is connected to the first support portion 215 through a pin shaft. The second support portion 216 limits a support space through two support plates, and the second rod portion 2132 is supported by the support plates, so that the third bracket 21 in the first closed position is fixed to the self-locking member 213. A first hinge 214 is connected to the main frame body 212 for connection with the first bracket 11. A plurality of reinforcing frames are provided on the main frame body 212, so that the third bracket 21 forms a grid-like structure, ensuring the structural strength of the third bracket 21 and also playing a role in covering and protecting the platform. The positions of the reinforcing frames can be selected as needed.

[0055] In one embodiment, the third bracket 21 is rotatably connected to the first bracket 11, and the fourth bracket 22 is rotatably connected to the second bracket 12. The third bracket 21 is adjusted between a first support position and a first closed position by rotation, and the fourth bracket 22 is also adjusted between a second support position and a second closed position by rotation. The adjustment is simple and can position the third bracket 21 and the first bracket 11 as well as position the fourth bracket 22 and the second bracket 12.

[0056] Refer to Figure 3 As shown, the first hinge 214 connects the third bracket 21 and the first bracket 11, and the second hinge 221 connects the fourth bracket 22 and the second bracket 12. The rotational connection is made through hinges, with a simple structure, easy installation, and a wide range of applications.

[0057] Reference Figure 3 and Figure 10 As shown, the fourth bracket 22 includes two support arms and a connecting arm. The support arms and the connecting arm define a U-shaped structure. The support arms are connected to the second bracket 12 through the second hinge 221. The connecting arm is used to connect the support arms. The structure of the fourth bracket 22 is simple.

[0058] Among them, the structures of the third bracket 21 and the fourth bracket 22 are not limited to the structures of the above embodiments, as long as they can achieve the functions of support and covering. The structures of the third bracket 21 and the fourth bracket 22 can also be swapped. The third bracket 21 and the fourth bracket 22 can act as a grid-shaped cover plate at the covering position. Both the third bracket 21 and the fourth bracket 22 can be made of square steel welded together.

[0059] It should be noted that the connection between the third bracket 21 and the first bracket 11 is not limited to rotational connection, and the connection between the fourth bracket 22 and the second bracket 12 is not limited to rotational connection either. The connection methods between the third bracket 21 and the first bracket 11 and between the fourth bracket 22 and the second bracket 12 can be the same or different, and can be selected according to needs. The rotational connection method between the third bracket 21 and the first bracket 11 is not limited to connection through a hinge, such as connection through a pin shaft; of course, the connection method between the fourth bracket 22 and the second bracket 12 is not limited to hinge connection either.

[0060] The following provides an embodiment for detecting the positional relationship between the support assembly 1 and the adjustment assembly 2.

[0061] In one embodiment, a trigger 211 is provided on one of the support assembly 1 and the adjustment assembly 2, and a detection sensor 3 for detecting the position of the trigger 211 is provided on the other. The adjustment assembly 2 switches between the support position and the covering position, corresponding to the change of the trigger 211 and the detection sensor 3 between the contact state and the separation state, that is, the detection sensor 3 and the trigger 211 cooperate to detect the state of the adjustment assembly 2.

[0062] Reference Figures 1 to 3 As shown, when the trigger 211 is in contact with the detection sensor 3, the adjustment assembly 2 is in the covering position. When the trigger 211 is separated from the detection sensor 3, the adjustment assembly 2 is in the separation state. The controller can confirm the position of the adjustment assembly 2 according to the contact signal or separation signal detected by the detection sensor 3, and then control the operating state of the lifting equipment. When the adjustment assembly 2 is in the support state, it indicates that the lifting equipment needs to stop to allow the staff to enter the protection platform for maintenance; when the adjustment assembly 2 is in the covering state, it indicates that the lifting equipment can operate normally.

[0063] In one embodiment, the detection sensor 3 is a limit switch. When the third bracket 21 is in the first closing position and / or the fourth bracket 22 is in the second closing position, the trigger 211 abuts against the limit switch. The limit switch has a simple structure, a wide application range and low cost.

[0064] Among them, the limit switch is fixed to the mounting support 31. The limit switch can be fixed to the support assembly 1 or the beam of the lifting equipment. For example, the limit switch is fixed to the main beam 4 or the end beam 5. The mounting support 31 is fixed to the main beam 4 or the end beam 5, and the beam has good stability. As Figures 1 to 3 shown, the limit switch is fixed to the end beam 5.

[0065] In one embodiment, a trigger 211 is provided on the third bracket 21. The trigger 211 includes a connecting portion 2111 fixed to the third bracket 21, a bending portion 2112 forming an angle with the connecting portion 2111, and a triggering portion 2113 for triggering the limit switch. The triggering portion 2113 forms an angle with the bending portion 2112. The structure of the trigger 211 is simple and can extend to the position of the limit switch through the bending structure. Refer to Figure 1 、 Figure 4 and Figure 9 shown, the trigger 211 is a Z-shaped structure.

[0066] In one embodiment, refer to Figures 1 to 3 as well as Figure 11 and Figure 12 shown, the first bracket 11 includes a cross beam and two longitudinal beams connected below the cross beam. The longitudinal beams extend in the height direction. The cross beam is used to connect the third bracket 21. The first bracket 11 is located on the side of the fence. The second bracket 12 includes a plurality of cross beams and a plurality of longitudinal beams connected to the cross beams. The longitudinal beams extend in the height direction. The cross beams are used to connect the fourth bracket 22. The second bracket 12 is located on the front of the fence.

[0067] The fence in the above embodiments can define a local platform to ensure the convenience of the staff and prevent the occurrence of high-altitude falling accidents. The adjusting component 2 is a folding structure. After being stacked, it forms a grid-shaped cover plate to prevent the staff from entering the protection platform. When a driving mechanism is installed in the protection platform and it is necessary to repair the driving mechanism, it is necessary to lift the grid-shaped cover plate. The grid-shaped cover plate is connected to the limit switch. After being lifted, the limit switch triggers the full vehicle stop signal and the lifting equipment stops running, effectively avoiding the occurrence of equipment hitting people accidents. At the same time, the grid-shaped cover plate is divided into two parts, the third bracket 21 and the fourth bracket 22. After being lifted and placed, the height of the railing can be increased. After being lifted, the two grid-shaped cover plates are fixedly connected by the self-locking member 213 to ensure the safety of the staff during work.

[0068] In an embodiment of another aspect of the present invention, in combination with Figures 1 to 13As shown, a lifting device is provided, including a beam body and the fence in the above-mentioned embodiment. The fence is located on one side of the beam body. If the lifting device has the fences of all the above-mentioned embodiments, it will have all the above-mentioned beneficial effects, which will not be elaborated here.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fence, characterized in that, comprising: a support assembly extending in the height direction to define a protection platform, including a first bracket and a second bracket forming an angle with and connected to the first bracket; an adjustment assembly including a third bracket and a fourth bracket forming an angle with the third bracket, the third bracket being adapted to be adjusted between a first support position supported above the first bracket and a first covering position covering the protection platform, the fourth bracket being adapted to be adjusted between a second support position supported above the second bracket and a second covering position covering the protection platform, at least one of the third bracket and the fourth bracket being provided with a self-locking member, when the third bracket is in the first support position and the fourth bracket is in the second support position, the self-locking member fixedly connects the third bracket and the fourth bracket.

2. The fence according to claim 1, characterized in that, the self-locking member is rotatably connected to at least one of the third bracket and the fourth bracket, and the self-locking member is provided as an eccentric structure so that the self-locking member automatically connects the third bracket and the fourth bracket under the eccentric action.

3. The fence according to claim 1, characterized in that, the self-locking member is provided with a plugging portion, and at least one of the third bracket and the fourth bracket is provided with a plugging hole adapted to the plugging portion.

4. The fence according to claim 3, characterized in that, the self-locking member includes a first rod portion and a second rod portion, one end of the first rod portion is rotatably connected to the third bracket or the fourth bracket, the second rod portion is connected to the other end of the first rod portion and is provided with the plugging portion, and the outer wall of the second rod portion is attached to the outer wall of the first rod portion to form an eccentric structure.

5. The fence according to claim 4, characterized in that, at least one of the third bracket and the fourth bracket is provided with a first support portion and a second support portion juxtaposed with the first support portion, the first support portion is rotatably connected to the first rod portion, and the second rod portion is snap-fitted in the second support portion.

6. The fence according to claim 1, characterized in that, the third bracket is rotatably connected to the first bracket, and the fourth bracket is rotatably connected to the second bracket.

7. The fence according to any one of claims 1 to 6, characterized in that, a trigger member is provided on one of the support assembly and the adjustment assembly, and a detection sensor for detecting the position of the trigger member is provided on the other.

8. The fence according to claim 7, characterized in that, the detection sensor is a limit switch, when the third bracket is in the first covering position and / or the fourth bracket is in the second covering position, the trigger member abuts against the limit switch.

9. The fence according to claim 8, characterized in that, the trigger member is provided on the third bracket, the trigger member includes a connecting portion fixed to the third bracket, a bending portion forming an angle with the connecting portion, and a triggering portion for triggering the limit switch, the triggering portion forms an angle with the bending portion.

10. A lifting device, Characterized in that, It includes a beam body and the fence according to any one of claims 1 to 9, and the fence is located on one side of the beam body.

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