Self-loading and unloading type building construction double-layer safety protective fence

Abstract

The invention relates to the technical field of double-layer safety protective fences, in particular to a self-loading and unloading type building construction double-layer safety protective fence which comprises a frame, a conveying table and a lifting mechanism. A first platform and a second platform are arranged on the frame, extending guide rails are arranged on the first platform and the second platform, a working area, a loading and unloading area and a lifting area are arranged on the frame, and the extending guide rails are arranged in the loading and unloading area; the conveying table is arranged in the lifting area of the frame in a lifting mode, an electric guide rail is arranged on the conveying table, and a supporting table is movably arranged on the electric guide rail; the lifting mechanism is used for driving the conveying table to ascend and descend in the lifting area. The function of transferring materials in different areas is achieved. An operator transfers and stores materials in the working area, when the supporting table moves to the loading and unloading area, the operator transfers the materials to the supporting table, then the materials are transferred to a designated position through the electric guide rail and the lifting mechanism, and then the functions of partitioned storage and designated transfer of the materials are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of double-layer safety guardrails, and in particular to a self-loading and unloading double-layer safety guardrail for building construction. Background Art

[0002] In aerial work, in order to ensure the safety of construction workers, liftable safety guardrails are usually used to transport personnel and materials. However, in the process of aerial work, carrying materials back and forth still has great hidden dangers, which not only increases the work intensity of construction workers, but also reduces the efficiency of material transportation and work efficiency.

[0003] To this end, a Chinese patent with authorization announcement number CN118289474B discloses a self-loading and unloading double-layer safety guardrail for construction and a method of using the same. The self-loading and unloading safety guardrail is configured to stably limit the material position by setting a storage and conveying component, and then the control panel is used to start pushing the unloading component and the limiting loading component to stably move and load the storage and conveying component containing the material. This solves the problems that the existing safety guardrail cannot self-load and unload during use, the transportation efficiency of construction materials is low, the work intensity of construction workers is high, and the convenience and safety of the safety guardrail are low, thereby achieving the effect of self-loading and unloading.

[0004] However, when loading and unloading materials, traditional equipment needs to use storage and conveying components to transport materials, and the storage and conveying components take up a lot of space. When construction workers need to load and unload and sort materials on the safety guardrail, the storage and conveying components will not only reduce the storage space, but also affect the normal activities of construction workers. Summary of the invention

[0005] In view of the above problems, a self-loading and unloading double-layer safety guardrail for construction is provided, which solves the problem that the material moving facilities of the traditional guardrail cannot cooperate with the operator through the frame, the transport platform and the lifting mechanism.

[0006] In order to solve the problems of the prior art, the present invention provides a self-loading and unloading double-layer safety guardrail for construction, comprising a frame, a transport platform and a lifting mechanism; the frame is provided with a first platform and a second platform distributed from bottom to top in a vertical direction, and the first platform and the second platform are both provided with extension guide rails, and the frame is provided with a working area, a loading and unloading area and a lifting area, and the extension guide rails are arranged in the loading and unloading area; the transport platform is arranged in the lifting area of ​​the frame so as to be liftable, and an electric guide rail is arranged on the transport platform, and a support platform is movably arranged on the electric guide rail; the lifting mechanism is used for driving the transport platform to rise and fall in the lifting area; in a working state, when the electric guide rail is connected to the extension guide rail, the electric guide rail controls the support platform to move toward the loading and unloading area.

[0007] Preferably, the lifting mechanism includes a screw, an extension shaft, a limiting assembly and a rotation drive assembly; the screw is rotatably arranged on the frame, and the screw is threadedly connected to the transport platform; the extension shaft is rotatably arranged on the frame, and the extension shaft is coaxially connected to the screw; the rotation drive assembly is used to drive the extension shaft to rotate; in the working state, when the electric guide rail controls the support platform to move to the extension guide rail, the limiting assembly limits the rotation of the extension shaft.

[0008] Preferably, the limiting assembly includes a connecting ring and a limiting ring; the connecting ring is sleeved on the extension shaft; the limiting ring is arranged on the extension shaft so as to be able to be raised and lowered, and the axis of the limiting ring is colinear with the axis of the extension shaft; a control assembly for controlling the lifting and lowering of the limiting ring is provided on the frame, and when the limiting ring abuts against the connecting ring, the limiting ring limits the connecting ring to rotate around the axis.

[0009] Preferably, a docking post and a first elastic member are provided on the limiting ring, the docking post is slidably mounted on the limiting ring, and both ends of the first elastic member are respectively connected to the docking post and the limiting ring; a first elastic member cooperating with the docking post is provided on the connecting ring.

[0010] Preferably, the control mechanism includes a connecting frame, a first transmission assembly and a second transmission assembly; the connecting frame is movably arranged on the frame; the connecting frame is transmission-connected to the support platform via the first transmission assembly; the connecting frame is transmission-connected to the limiting ring via the second transmission assembly; in a working state, when the support platform moves toward the extension guide rail, the first transmission assembly is driven by the squeezing action of the support platform, and the first transmission assembly drives the second transmission assembly via the transmission of the connecting frame, and the second transmission assembly controls the limiting ring to move toward the connecting ring.

[0011] Preferably, the first transmission assembly includes a counterweight rod and a connecting block; the counterweight rod is arranged on the frame so as to be liftable, and each loading and unloading area is provided with two counterweight rods; the connecting block is connected to the connecting frame; a first inclined surface is provided on the top of the counterweight rod, and a second inclined surface is provided on the connecting block, and the first inclined surface and the second inclined surface are slidably matched; when the support platform moves toward the loading and unloading area, the counterweight rod of the loading and unloading area is squeezed, so that the counterweight rod is in an upward state.

[0012] Preferably, a roller is rotatably provided at the bottom end of the counterweight rod.

[0013] Preferably, a bracket is provided on the frame, a bracket is slidably mounted on the support frame, and the limiting ring is connected to the bracket; a second elastic member is provided on the bracket, and brackets at both ends of the second elastic member are connected to the bracket.

[0014] Preferably, the second transmission assembly includes a connecting rod, which is connected to the connecting frame; an oblique protrusion is provided on the connecting rod, and the oblique protrusion is slidably matched with the bracket.

[0015] Preferably, a protective frame for protecting the screw is provided on the frame.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention realizes the function of transferring materials by zones through the frame, the transport platform and the lifting mechanism. In the working state, the operator transfers and stores materials in the working area. When the support platform moves to the loading and unloading area, the operator transfers the materials to the support platform, and then transfers the materials to the designated position through the electric guide rail and the lifting mechanism, thereby realizing the function of zoned storage and designated transfer of materials.

[0017] 2. The present invention realizes the function of stabilizing the state of the transport platform during the loading and unloading process through the screw rod, the extension shaft, the limiting assembly and the rotation drive assembly, thereby preventing the lifting mechanism from controlling the lifting of the transport platform when the support platform moves to the extension guide rail, causing the support platform to derail, thereby improving the stability of the loading and unloading work of the guardrail. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic diagram of a self-loading and unloading double-layer safety guardrail for building construction according to the present invention.

[0019] Figure 2 It is a three-dimensional exploded schematic diagram of a self-loading and unloading double-layer safety guardrail for building construction according to the present invention.

[0020] Figure 3 It is a three-dimensional schematic diagram of a self-loading and unloading double-layer safety guardrail for construction of the present invention when a support platform on a transport platform moves to a loading and unloading area on a first platform.

[0021] Figure 4 It is a three-dimensional schematic diagram of a transport platform and a lifting mechanism in a self-loading and unloading double-layer safety guardrail for building construction according to the present invention.

[0022] Figure 5 It is a three-dimensional schematic diagram of the cooperation between a lifting mechanism and a control mechanism in a self-loading and unloading double-layer safety guardrail for building construction of the present invention.

[0023] Figure 6 It is a three-dimensional schematic diagram of a bracket and a limiting component in a self-loading and unloading double-layer safety guardrail for building construction of the present invention.

[0024] Figure 7 It is a three-dimensional exploded schematic diagram of a restriction component in a self-loading and unloading double-layer safety guardrail for building construction according to the present invention.

[0025] Figure 8 It is a three-dimensional schematic diagram of a connecting frame and a second transmission assembly in a self-loading and unloading double-layer safety guardrail for building construction of the present invention.

[0026] Fig. 9 The present invention Figure 8 A local enlarged schematic diagram of point A in the middle.

[0027] Fig.10 It is a three-dimensional schematic diagram of a second transmission assembly in a self-loading and unloading double-layer safety guardrail for building construction according to the present invention.

[0028] The numbers in the figure are: 1, frame; 11, first platform; 12, second platform; 13, extension rail; 14, protective plate; 141, outer guard plate; 142, inner guard plate; 15, bracket; 151, bracket; 152, second elastic member; 16, protective frame; 2, transport platform; 21, electric guide rail; 22, support platform; 3, lifting mechanism; 31, screw; 32, extension shaft; 33, limiting assembly; 331, connecting ring; 3311, docking groove; 332, limiting ring; 3321, docking column; 3322, first elastic member; 34, rotation drive assembly; 341, rotation driver; 342, worm; 343, worm wheel; 4, control mechanism; 41, connecting frame; 42, first transmission assembly; 421, counterweight rod; 4211, roller; 422, connecting block; 43, second transmission assembly; 431, connecting rod; 4311, oblique protrusion. DETAILED DESCRIPTION

[0029] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] Reference Figure 1-Figure 3 A self-loading and unloading double-layer safety guardrail for construction, comprising a frame 1, a transport platform 2 and a lifting mechanism 3; the frame 1 is provided with a first platform 11 and a second platform 12 distributed from bottom to top in a vertical direction, and the first platform 11 and the second platform 12 are both provided with an extension guide rail 13, the frame 1 is provided with a working area, a loading and unloading area and a lifting area, and the extension guide rail 13 is arranged in the loading and unloading area; the transport platform 2 is arranged in the lifting area of ​​the frame 1 so as to be liftable, and the transport platform 2 is provided with an electric guide rail 21, and a support platform 22 is movably arranged on the electric guide rail 21; the lifting mechanism 3 is used for driving the transport platform 2 to rise and fall in the lifting area; in a working state, when the electric guide rail 21 is connected to the extension guide rail 13, the electric guide rail 21 controls the support platform 22 to move toward the loading and unloading area.

[0031] The present invention realizes the function of transferring materials in different areas through the frame 1, the transport platform 2 and the lifting mechanism 3. In the working state, the operator transfers and stores materials in the working area. When the support platform 22 moves to the loading and unloading area, the operator transfers the materials to the support platform 22, and then transfers the materials to the designated position through the electric guide rail 21 and the lifting mechanism 3, thereby realizing the function of storing and transferring materials in different areas. The problem that the material transfer facilities of the traditional guardrail cannot cooperate with the operator is solved. A controller for human-computer interaction is provided on the frame 1, and the lifting mechanism 3 is electrically connected to the controller. In order to increase the storage capacity of the frame 1, two working areas and two loading and unloading areas are provided on the first platform 11 and the second platform 12, and the lifting area is arranged between the two loading and unloading areas, and the working area is arranged on the side of the loading and unloading area away from the lifting area, so that the support platform 22 can be moved to any loading and unloading area through the transport platform 2 in the lifting area. The electric guide rail 21 is preferably a ball screw type electric guide rail 21. The ball screw and the nut are subjected to rolling friction through the ball, and the friction force is small, so that the support platform 22 can be controlled with high precision. A double-layer protective plate 14 is provided on the frame 1. The protective plates 14 are respectively an outer protective plate 141 and an inner protective plate 142. The outer protective plate 141 is preferably a metal fence, and the inner protective plate 142 is preferably tempered glass. The outer protective plate 141 and the inner protective plate 142 cooperate to achieve a protective effect.

[0032] When storing materials, operators can classify and store materials in the work area. When the support platform 22 moves to the loading and unloading area, operators in the work area adjacent to the loading and unloading area can transfer materials between the work area and the loading and unloading area. When using the transport platform 2 to transfer materials, the operator first transfers the materials to the support platform 22 in the loading and unloading area, and then controls the support platform 22 to reset through the electric guide rail 21. When the support platform 22 is completely moved to the lifting area, the lifting mechanism 3 controls the transport platform 2 to rise and fall in the lifting area to transfer materials.

[0033] Reference Figure 3 and Figure 4 : The lifting mechanism 3 includes a screw 31, an extension shaft 32, a limiting assembly 33 and a rotation drive assembly 34; the screw 31 is rotatably set on the frame 1, and the screw 31 is threadedly connected to the transport platform 2; the extension shaft 32 is rotatably set on the frame 1, and the extension shaft 32 is coaxially connected to the screw 31; the rotation drive assembly 34 is used to drive the extension shaft 32 to rotate; in the working state, when the electric guide rail 21 controls the support platform 22 to move to the extension guide rail 13, the limiting assembly 33 limits the rotation of the extension shaft 32.

[0034] The present invention realizes the function of stabilizing the state of the transport platform 2 during loading and unloading by means of the screw 31, the extension shaft 32, the limiting assembly 33 and the rotating drive assembly 34, so as to avoid the situation that the lifting mechanism 3 controls the lifting of the transport platform 2 when the support platform 22 moves to the extension guide rail 13, causing the support platform 22 to derail, thereby improving the stability of the loading and unloading work of the guardrail. The rotating drive assembly 34 includes a rotating driver 341, a worm 342 and a worm wheel 343, the rotating driver 341 is arranged at the top of the frame 1, the worm 342 is rotatably arranged on the frame 1, the worm wheel 343 is sleeved on the extension shaft 32, and the worm 342 is meshed and connected with the worm wheel 343. The rotating driver 341 is preferably a servo motor, and the rotating driver 341 is electrically connected to the controller. When transferring materials, the operator first sends a signal to the rotating driver 341 through the controller, and the rotating driver 341 drives the extension shaft 32 and the screw 31 to rotate after receiving the signal, and the screw 31 drives the transport platform 2 threadedly connected thereto to lift and lower in the lifting area. After the transport platform 2 moves to the first platform 11 or the second platform 12, when the electric guide rail 21 is connected to the extension guide rail 13, the electric guide rail 21 controls the support platform 22 to slide toward the extension guide rail 13, and when the support platform 22 is completely moved to the loading and unloading area, the operator transfers the material, and after the support platform 22 is away from the lifting area, the limiting component 33 limits the rotation of the extension shaft 32, and during the loading and unloading process, it is prevented that the lifting mechanism 3 controls the transport platform 2 to rise and fall due to the operator's misoperation.

[0035] Reference Figure 4 and Figure 6 : The limiting assembly 33 includes a connecting ring 331 and a limiting ring 332; the connecting ring 331 is sleeved on the extension shaft 32; the limiting ring 332 is arranged on the extension shaft 32 so as to be able to be raised and lowered, and the axis of the limiting ring 332 is colinear with the axis of the extension shaft 32; a control assembly for controlling the lifting and lowering of the limiting ring 332 is provided on the frame 1, and when the limiting ring 332 abuts against the connecting ring 331, the limiting ring 332 limits the connecting ring 331 from rotating around the axis.

[0036] As a first embodiment of the limiting assembly 33, the present invention realizes the function of limiting the rotation of the extension shaft 32 through the connecting ring 331, the limiting ring 332 and the control mechanism 4. The limiting ring 332 is in sliding cooperation with the extension shaft 32. When the connecting ring 331 abuts against the limiting ring 332, in order to increase the friction between the limiting ring 332 and the connecting ring 331, anti-skid lines are provided on the contact surface between the connecting ring 331 and the limiting ring 332, and the anti-skid lines are not shown in the figure. When the limiting ring 332 is separated from the extension shaft 32, the rotation drive assembly 34 can drive the extension shaft 32 to rotate, while the limiting ring 332 is in a stationary state. When the limiting ring 332 abuts against the connecting ring 331, the static friction between the limiting ring 332 and the connecting ring 331 hinders the rotation of the extension shaft 32 and the connecting ring 331.

[0037] Reference Figure 4 , Figure 6 and Figure 7 : The limiting ring 332 is provided with a docking column 3321 and a first elastic member 3322, the docking column 3321 is slidably installed on the limiting ring 332, and the two ends of the first elastic member 3322 are respectively connected to the docking column 3321 and the limiting ring 332; the connecting ring 331 is provided with a first elastic member 3322 that cooperates with the docking column 3321.

[0038] As a second embodiment of the limiting component 33, the present invention realizes the function of limiting the rotation of the extension shaft 32 when the connection ring 331 and the limiting ring 332 abut against each other through the docking column 3321, the first elastic member 3322 and the docking groove 3311. When the control mechanism 4 controls the connection ring 331 to abut against the limiting ring 332, if the docking column 3321 is misaligned with the docking groove 3311, the docking column 3321 is subjected to the pressure of the connection ring 331, the first elastic member 3322 shrinks under the pressure, and the docking column 3321 also shrinks relatively. After the rotation drive component 34 drives the extension shaft 32 to rotate, the extension shaft 32 drives the connection ring 331 to rotate, and when the docking groove 3311 is aligned with the docking column 3321, the docking column 3321 is plugged and matched with the docking groove 3311 under the elastic force of the first elastic member 3322, and then the rotation of the connection ring 331 is limited by the limiting ring 332 whose rotation is limited. In order to improve the response speed of the limiting assembly 33 , a plurality of docking grooves 3311 are provided on the connecting ring 331 , thereby improving the efficiency of aligning the docking posts 3321 with the docking grooves 3311 .

[0039] Reference Figure 3 and Figure 5 : The control mechanism 4 includes a connecting frame 41, a first transmission assembly 42 and a second transmission assembly 43; the connecting frame 41 is movably arranged on the frame 1; the connecting frame 41 is transmission-connected to the support platform 22 through the first transmission assembly 42; the connecting frame 41 is transmission-connected to the limiting ring 332 through the second transmission assembly 43; in the working state, when the support platform 22 moves toward the extension guide rail 13, the first transmission assembly 42 is driven by the squeezing action of the support platform 22, and the first transmission assembly 42 drives the second transmission assembly 43 through the transmission of the connecting frame 41, and the second transmission assembly 43 controls the limiting ring 332 to move toward the connecting ring 331.

[0040] The present invention realizes the function of controlling the movement of the limiting ring 332 when the support platform 22 moves laterally through the connecting frame 41, the first transmission assembly 42 and the second transmission assembly 43. When the electric guide rail 21 controls the support platform 22 to move toward the extension guide rail 13, the support platform 22 drives the first transmission assembly 42 through the extrusion action, and the first transmission assembly 42 transmits the pressure to the second transmission assembly 43 through the connecting frame 41. The second transmission assembly 43 controls the limiting ring 332 to move toward the connecting ring 331, so that the connecting ring 331 abuts against the limiting ring 332, and the limiting assembly 33 limits the rotation of the extension shaft 32.

[0041] Reference Figure 3 and Figure 8 : The first transmission assembly 42 includes a counterweight rod 421 and a connecting block 422; the counterweight rod 421 can be raised and lowered and is arranged on the frame 1, and each loading and unloading area is provided with two counterweight rods 421; the connecting block 422 is connected to the connecting frame 41; a first inclined surface is provided on the top of the counterweight rod 421, and a second inclined surface is provided on the connecting block 422, and the first inclined surface and the second inclined surface are slidably matched; when the support platform 22 moves toward the loading and unloading area, the counterweight rod 421 of the loading and unloading area is squeezed, so that the counterweight rod 421 is in an upward state.

[0042] The present invention realizes the function of controlling the movement of the connecting frame 41 by the movement of the support platform 22 through the counterweight rod 421 and the connecting block 422. In the working state, when the electric guide rail 21 controls the support platform 22 to move toward the extension guide rail 13, the support platform 22 squeezes the bottom end of the counterweight rod 421, thereby pushing the counterweight rod 421 to move upward. When the counterweight rod 421 moves upward, the second inclined surface of the connecting block 422 is squeezed, thereby pushing the connecting frame 41 to move. The connecting frame 41 drives the limiting ring 332 to move toward the connecting ring 331 through the second transmission assembly 43. In order to stably drive the counterweight rod 421 to move upward when the support platform 22 abuts against the counterweight rod 421, a third inclined surface is provided on both sides of the support platform 22 close to the loading and unloading area.

[0043] Reference Figure 8 : A roller 4211 is rotatably provided at the bottom end of the counterweight rod 421.

[0044] The present invention reduces the wear between the support platform 22 and the counterweight rod 421 by setting a roller 4211 at the bottom end of the counterweight rod 421, thereby improving the extrusion stability of the support wheel on the counterweight rod 421. After the support platform 22 lifts the counterweight rod 421, it will continue to slide along the extension guide rail 13, so that a long period of continuous friction will occur between the support platform 22 and the counterweight rod 421. For this reason, a roller 4211 is set at the bottom of the counterweight rod 421, and the rolling friction between the roller 4211 and the support platform 22 is used to replace the sliding friction, thereby reducing the wear of the support platform 22 and the counterweight rod 421 and improving the service life of the parts.

[0045] Reference Figure 6: A bracket 15 is provided on the frame 1, and a bracket 151 is slidably installed on the support frame, and the limiting ring 332 is connected to the bracket 151; a second elastic member 152 is provided on the bracket 151, and the brackets 15 and the brackets 151 are connected at both ends of the second elastic member 152.

[0046] The present invention realizes the function of supporting the limiting ring 332 through the bracket 15, the bracket 151 and the second elastic member 152, and achieves the effect of controlling the reset of the limiting ring 332 through the elastic force of the second elastic member 152. In the working state, when the connecting frame 41 moves under the drive of the first transmission component 42, the connecting frame 41 drives the limiting ring 332 to move closer to the connecting ring 331 through the second transmission component 43, and the second elastic member 152 stretches under the pressure. After the electric guide rail 21 controls the support platform 22 to reset, the counterweight rod 421 resets under the action of gravity, and the bracket 151 and the limiting ring 332 reset under the elastic force of the second elastic member 152.

[0047] Reference Figure 8-Figure 10 : The second transmission assembly 43 includes a connecting rod 431, which is connected to the connecting frame 41; an oblique protrusion 4311 is provided on the connecting rod 431, and the oblique protrusion 4311 is slidably matched with the bracket 151.

[0048] The present invention realizes the function of pushing the limiting ring 332 to move by the movement of the connecting frame 41 through the connecting rod 431 and the oblique protrusion 4311. The connecting rods 431 on the connecting frames 41 on both sides of the frame 1 are staggered. When the connecting rod on one side moves in a direction away from the bracket 151, the oblique protrusion 4311 on the connecting rod 431 squeezes the bracket 151, thereby pushing the bracket 151 upward, so that the limiting ring 332 on the bracket 151 abuts against the connecting ring 331.

[0049] Reference Figure 4 and Figure 5 : A protection frame 16 for protecting the screw rod 31 is provided on the frame 1.

[0050] The present invention realizes the function of protecting the screw 31 through the protective frame 16, avoids the situation where the screw 31 contacts with other objects and wears, and improves the service life of the screw 31. The frame 1 is provided with a guide rod for guiding the movement of the transport platform 2, and the guide rod is slidably matched with the transport platform 2. A plurality of protective frames 16 are provided, and the plurality of protective frames 16 are arranged at intervals. The guide rod and the screw 31 are protected by the plurality of protective frames 16. In addition, the protective frame 16 is arranged vertically, and the first platform 11 and the second platform 12 are connected by the protective frame 16, which can further improve the overall strength of the frame 1.

[0051] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A self-loading and unloading double-layer safety guardrail for construction, characterized in that: It comprises a frame (1), a transport platform (2) and a lifting mechanism (3); The frame (1) is provided with a first platform (11) and a second platform (12) which are distributed from bottom to top in a vertical direction, and the first platform (11) and the second platform (12) are both provided with an extension rail (13). The frame (1) is provided with a working area, a loading and unloading area, and a lifting area, and the extension rail (13) is arranged in the loading and unloading area; The transport platform (2) is arranged in a lifting area of ​​the frame (1) so as to be liftable, an electric guide rail (21) is arranged on the transport platform (2), and a support platform (22) is movably arranged on the electric guide rail (21); The lifting mechanism (3) is used to drive the transport platform (2) to move up and down within the lifting area; In a working state, when the electric guide rail (21) is connected to the extension guide rail (13), the electric guide rail (21) controls the support platform (22) to move toward the loading and unloading area.

2. A self-loading and unloading double-layer safety guardrail for construction according to claim 1, characterized in that: The lifting mechanism (3) comprises a screw rod (31), an extension shaft (32), a limiting assembly (33) and a rotation driving assembly (34); The screw rod (31) is rotatably arranged on the frame (1), and the screw rod (31) is threadably connected to the transport platform (2); The extension shaft (32) is rotatably disposed on the frame (1), and the extension shaft (32) is coaxially connected to the screw rod (31); The rotation drive assembly (34) is used to drive the extension shaft (32) to rotate; In a working state, when the electric guide rail (21) controls the support platform (22) to move to the extension guide rail (13), the limiting component (33) limits the rotation of the extension shaft (32).

3. A self-loading and unloading double-layer safety guardrail for construction according to claim 2, characterized in that: The limiting assembly (33) includes a connecting ring (331) and a limiting ring (332); The connecting ring (331) is sleeved on the extension shaft (32); The limiting ring (332) is arranged on the extension shaft (32) in a manner that it can be lifted and lowered, and the axis of the limiting ring (332) is colinear with the axis of the extension shaft (32); The frame (1) is provided with a control component for controlling the lifting of the limiting ring (332); when the limiting ring (332) abuts against the connecting ring (331), the limiting ring (332) limits the connecting ring (331) from rotating around an axis.

4. A self-loading and unloading double-layer safety guardrail for construction according to claim 3, characterized in that: A docking post (3321) and a first elastic member (3322) are provided on the restriction ring (332); the docking post (3321) is slidably mounted on the restriction ring (332); and two ends of the first elastic member (3322) are respectively connected to the docking post (3321) and the restriction ring (332); The connecting ring (331) is provided with a first elastic member (3322) that cooperates with the docking column (3321).

5. The self-loading and unloading double-layer safety guardrail for construction according to claim 3 is characterized in that: The control mechanism (4) comprises a connecting frame (41), a first transmission assembly (42) and a second transmission assembly (43); The connecting frame (41) is movably arranged on the frame (1); The connecting frame (41) is transmission-connected to the support platform (22) via a first transmission assembly (42); The connecting frame (41) is transmission-connected to the limiting ring (332) via a second transmission assembly (43); In a working state, when the support platform (22) moves toward the extension guide rail (13), the first transmission assembly (42) is driven by the squeezing action of the support platform (22), and the first transmission assembly (42) drives the second transmission assembly (43) through the transmission of the connecting frame (41), and the second transmission assembly (43) controls the limiting ring (332) to move toward the connecting ring (331).

6. A self-loading and unloading double-layer safety guardrail for construction according to claim 5, characterized in that: The first transmission assembly (42) comprises a counterweight rod (421) and a connecting block (422); The counterweight rod (421) is arranged on the frame (1) in a manner that it can be raised or lowered, and each loading and unloading area is provided with two counterweight rods (421); The connecting block (422) is connected to the connecting frame (41); A first inclined surface is formed on the top of the counterweight rod (421), and a second inclined surface is formed on the connecting block (422), and the first inclined surface and the second inclined surface are slidably matched; When the support platform (22) moves toward the loading and unloading area, the counterweight rod (421) in the loading and unloading area is squeezed, so that the counterweight rod (421) is in an upward moving state.

7. A self-loading and unloading double-layer safety guardrail for construction according to claim 6, characterized in that: A roller (4211) is rotatably provided at the bottom end of the counterweight rod (421).

8. The self-loading and unloading double-layer safety guardrail for construction according to claim 5 is characterized in that: A support (15) is provided on the frame (1), a bracket (151) is slidably mounted on the support frame, and a limiting ring (332) is connected to the bracket (151); A second elastic member (152) is provided on the bracket (151), and brackets (15) at both ends of the second elastic member (152) are connected to the bracket (151).

9. A self-loading and unloading double-layer safety guardrail for construction according to claim 8, characterized in that: The second transmission assembly (43) comprises a connecting rod (431), and the connecting rod (431) is connected to the connecting frame (41); An oblique protrusion (4311) is provided on the connecting rod (431), and the oblique protrusion (4311) is slidably matched with the bracket (151).

10. The self-loading and unloading double-layer safety guardrail for construction according to claim 2 is characterized in that: A protection frame (16) for protecting the screw rod (31) is provided on the frame (1).

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