Safety protection mechanism and scissors lifting platform

Abstract

This invention relates to the technical field of safety protection mechanisms for scissor lift platforms, specifically a safety protection mechanism and a scissor lift platform, comprising: a fixed guardrail fixed to the lifting platform, a folding guardrail mounting base fixed to the lifting platform, and a first section of folding guardrail rotatably connected to the folding guardrail mounting base; the beneficial effects are: when loading tall building materials or other items onto the lifting platform, both the first and second sections of folding guardrail are in an upright state, allowing the taller items to rest against the second section of folding guardrail, with the fixed guardrail and the first section of folding guardrail together providing safety protection for personnel and items on the lifting platform; when the scissor lift platform needs to be moved, rotating both the first and second sections of folding guardrail to a horizontal state, and then rotating the second section of folding guardrail to an upright state, can reduce the height of the scissor lift platform, facilitating its movement.

Description

Technical Field

[0001] This invention relates to the technical field of safety protection mechanisms for scissor lift platforms, specifically a safety protection mechanism and a scissor lift platform. Background Technology

[0002] A scissor lift platform is a device that uses a scissor-type mechanical structure to achieve vertical lifting. It is widely used in logistics, manufacturing, warehousing, and construction industries. Applications of scissor lift platforms In existing technology, the lifting action of a scissor lift platform mainly relies on the coordination of its scissor mechanism and drive system. During lifting: the drive system (such as a hydraulic pump) operates, sending pressurized oil into the cylinder, pushing the piston rod to extend. The thrust of the piston rod causes the crossed scissor arms to unfold, thereby lifting the platform upwards. During descent: the control system switches the oil circuit, and the hydraulic oil in the cylinder slowly flows back to the oil tank under the platform's own weight, causing the scissor arms to fold, and the platform to descend smoothly. The system typically includes safety components such as balance valves or hydraulically controlled check valves to ensure that even if an oil pipe ruptures unexpectedly, the platform will not fall rapidly but will descend slowly, ensuring safety. The safety protection mechanism of a scissor lift platform is usually a guardrail fixed to the lifting platform. Some guardrails are built very high so that taller building materials such as sheet metal can be placed against the guardrail for transport to higher locations.

[0003] However, when scissor lifts are loaded onto trucks for transport, the excessively high guardrails can prevent trucks from passing through some height-restricted roads, causing inconvenience to the transport of scissor lifts. Summary of the Invention

[0004] The purpose of this invention is to provide a safety protection mechanism and a scissor lift platform to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a safety protection mechanism and a scissor lift platform, comprising: a fixed guardrail, the fixed guardrail being fixed on a lift platform, a folding guardrail mounting base being fixed on the lift platform, a first folding guardrail being rotatably connected to the folding guardrail mounting base, a second folding guardrail being rotatably connected to the top of the first folding guardrail, an extension guardrail being fixed to the first folding guardrail, a second locking plate being fixed to one end of the second folding guardrail, the second locking plate abutting against one end of the first folding guardrail, a third locking plate being slidably connected to the other end of the second folding guardrail, the third locking plate abutting against the other end of the first folding guardrail, a first locking plate being fixed to the first folding guardrail, a first limiting mechanism being provided between the first folding guardrail and the folding guardrail mounting base, and a second limiting mechanism being provided between the second folding guardrail and the extension guardrail.

[0006] Preferably, a third card plate mounting seat is fixed on the second section of the folding guardrail. The third card plate mounting seat has a "U" shaped plate structure, and the third card plate has a rectangular plate structure. The third card plate is movably inserted between the two sets of side plates of the third card plate mounting seat. A top plate is fixed to the top of the third card plate. The top plate has a rectangular plate structure, and the bottom end of the top plate abuts against the top of the third card plate mounting seat.

[0007] Preferably, the first limiting mechanism includes: a limiting plate mounting groove, a first limiting groove, and a limiting plate. Both the limiting plate mounting groove and the first limiting groove are rectangular groove structures. The limiting plate mounting groove is located at one end of the first folding guardrail near the folding guardrail mounting seat, and the first limiting groove is located at one end of the folding guardrail mounting seat near the first folding guardrail. The limiting plate is a rectangular plate structure, with one end of the limiting plate movably inserted into the limiting plate mounting groove and the other end of the limiting plate movably inserted into the first limiting groove.

[0008] Preferably, a pull rod is movably inserted at the end of the first folding guardrail away from the folding guardrail mounting base. The pull rod has a circular rod structure. One end of the pull rod extends into the mounting groove of the limiting plate. The end of the pull rod extending into the mounting groove of the limiting plate is fixed to the surface of the limiting plate at the end away from the folding guardrail mounting base. The other end of the pull rod extends out from the surface of the first folding guardrail. A pull block is fixed at the end of the pull rod extending out from the first folding guardrail. The pull block has a rectangular block structure.

[0009] Preferably, two sets of limiting springs are fixed to one end of the limiting plate that extends into the limiting plate mounting groove. The ends of the two sets of limiting springs away from the limiting plate are fixed to the inner wall of the limiting plate mounting groove. The two sets of limiting springs are symmetrically distributed about the pull rod.

[0010] Preferably, a limit rod mounting seat is fixed on the second section of the folding guardrail, and the limit rod mounting seat has a rectangular block structure.

[0011] Preferably, the second limiting mechanism includes: a second limiting groove, a limiting rod mounting groove, and a limiting rod. Both the second limiting groove and the limiting rod mounting groove are circular groove structures. The second limiting groove is formed on the extended guardrail, and the limiting rod mounting groove is formed on the limiting rod mounting seat. The limiting rod is a circular rod structure, with one end of the limiting rod rotatably inserted into the second limiting groove and the other end of the limiting rod rotatably inserted into the limiting rod mounting groove.

[0012] Preferably, the end of the limiting rod mounting base away from the extended guardrail has a screw hole, which is connected to the limiting rod mounting groove, and the wall of the screw hole has an internal thread.

[0013] Preferably, a screw is rotatably inserted into the screw hole. The screw has a circular rod structure and an external thread on its rod body. The external thread of the screw mates with the internal thread of the screw hole. The end of the screw near the extended guardrail extends into the mounting groove of the limiting rod, and the end of the screw extending into the mounting groove of the limiting rod is fixed to the end of the limiting rod extending into the mounting groove of the limiting rod. The end of the screw away from the extended guardrail extends out of the screw hole. A knob is fixed to the end of the screw extending out of the screw hole. The knob has a rectangular block structure.

[0014] A scissor lift platform, including the aforementioned safety protection mechanism.

[0015] Compared with the prior art, the beneficial effects of the present invention are: The safety protection mechanism and scissor lift platform proposed in this invention allow for several safety features. When loading tall building materials or other items onto the lift platform, both the first and second folding guardrails are in an upright position. The taller items can be placed against the second folding guardrail, and the fixed guardrail and the first folding guardrail together provide safety protection for personnel and items on the lift platform. When the scissor lift platform needs to be moved, both the first and second folding guardrails are rotated to a horizontal position, and then the second folding guardrail is rotated back to an upright position, which reduces the height of the scissor lift platform and facilitates its movement. Furthermore, when it is not necessary to transport tall materials during operation, the first folding guardrail is laid flat and the second folding guardrail is raised, which expands the area of ​​the lift platform. The fixed guardrail, the second folding guardrail, and the extended guardrail provide safety protection for personnel and items on the lift platform. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the first section of the folded guardrail in its horizontal state; Figure 3 This is a schematic diagram of the second card plate installation structure; Figure 4 This is a schematic diagram of the structure on the other side of the first section of the folded guardrail in its horizontal state; Figure 5 for Figure 3 Schematic diagram of the cross-sectional structure at point AA; Figure 6 for Figure 5 Enlarged schematic diagram of the structure at point B; Figure 7 for Figure 4 Schematic diagram of the cross-sectional structure at the CC section; Figure 8 for Figure 7 Enlarged schematic diagram of the structure at point D.

[0017] In the diagram: 1. Lifting platform; 2. Fixed guardrail; 3. First folding guardrail; 4. Second folding guardrail; 5. Extended guardrail; 6. Screw; 7. Knob; 8. Folding guardrail mounting base; 9. First clamping plate; 10. Second clamping plate; 11. Third clamping plate mounting base; 12. Third clamping plate; 13. Top plate; 14. Limiting plate mounting slot; 15. First limiting slot; 16. Limiting plate; 17. Limiting spring; 18. Pull rod; 19. Pull block; 20. Second limiting slot; 21. Limiting rod mounting base; 22. Limiting rod mounting slot; 23. Limiting rod; 24. Screw hole. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1: Please refer to Figures 1 to 8 This invention provides a technical solution: a safety protection mechanism and a scissor lift platform, comprising: a fixed guardrail 2, the fixed guardrail 2 being fixed on a lifting platform 1, a folding guardrail mounting base 8 being fixed on the lifting platform 1, a first folding guardrail 3 being rotatably connected to the folding guardrail mounting base 8, a second folding guardrail 4 being rotatably connected to the top of the first folding guardrail 3, an extended guardrail 5 being fixed to the first folding guardrail 3, a second clamping plate 10 being fixed to one end of the second folding guardrail 4, the second clamping plate 10 abutting against one end of the first folding guardrail 3, a third clamping plate 12 being slidably connected to the other end of the second folding guardrail 4, the third clamping plate 12 abutting against the other end of the first folding guardrail 3, a first clamping plate 9 being fixed to the first folding guardrail 3, a first limiting mechanism being provided between the first folding guardrail 3 and the folding guardrail mounting base 8, and a second limiting mechanism being provided between the second folding guardrail 4 and the extended guardrail 5.

[0020] When it is necessary to load tall building materials or other items on the lifting platform 1, both the first folding guardrail 3 and the second folding guardrail 4 are in an upright state. The first limiting mechanism is in the limit open state, limiting the top of the first folding guardrail 3 to the folding guardrail mounting base 8. The bottom of the first folding guardrail 3 is rotatably connected to the folding guardrail mounting base 8, thereby maintaining the upright state of the first folding guardrail 3. One end of the second folding guardrail 4 is fixed with a second clamping plate 10, and the end of the second clamping plate 10 fixed to the second folding guardrail 4 also abuts against the first folding guardrail 3. The other end of the second folding guardrail 4 is connected with a third clamping plate 12, and the third clamping plate 12 abuts against the other end of the first folding guardrail 3, thereby maintaining the upright state of the second folding guardrail 4. Tall building materials or other items can be placed against the second folding guardrail 4. The fixed guardrail 2 and the first folding guardrail 3 together provide safety protection for personnel and items on the lifting platform 1. When it is necessary to scissor lift platform During transport, the first limiting mechanism is released, and both the first folding guardrail 3 and the second folding guardrail 4 are rotated to a horizontal position. Then, the second folding guardrail 4 is rotated to an upright position, and the second limiting mechanism is activated. This connects the top of the second folding guardrail 4 to the top of the extended guardrail 5, maintaining the upright position of the second folding guardrail 4. This reduces the height of the scissor lift platform, facilitating its transport. Furthermore, when transporting taller materials is not required, the first folding guardrail 3 is laid flat, and the second folding guardrail 4 is erected. The first clamping plate 9 fixed to the first folding guardrail 3, after rotating with it, rests against the bottom of the lifting platform 1, maintaining its horizontal position and expanding the area of ​​the lifting platform 1. The guardrail 2, the second folding guardrail 4, and the extended guardrail 5 provide safety protection for personnel and goods on the lifting platform 1.

[0021] Example 2: Based on Example 1, in order to realize the movable connection between the second folding guardrail 4 and the third card plate 12, a third card plate mounting seat 11 is fixed on the second folding guardrail 4. The third card plate mounting seat 11 has a "U" shaped plate structure, and the third card plate 12 has a rectangular plate structure. The third card plate 12 is movably inserted between the two sets of side plates of the third card plate mounting seat 11. A top plate 13 is fixed to the top of the third card plate 12. The top plate 13 has a rectangular plate structure, and the bottom end of the top plate 13 abuts against the top of the third card plate mounting seat 11.

[0022] A third card plate mounting base 11 is fixed on the second section of the folding guardrail 4. When the third card plate 12 is inserted into the third card plate mounting base 11, the top plate 13 rests on the top of the third card plate mounting base 11, so that the third card plate 12 is limited in the third card plate mounting base 11, thereby connecting the third card plate 12 to the second section of the folding guardrail 4. The connection between the second section of the folding guardrail 4 and the third card plate 12 can be released by removing the third card plate 12 from the third card plate mounting base 11.

[0023] Example 3: Based on Example 2, to realize the operation of the first limiting mechanism, the first limiting mechanism includes: a limiting plate mounting groove 14, a first limiting groove 15, and a limiting plate 16. Both the limiting plate mounting groove 14 and the first limiting groove 15 are rectangular groove structures. The limiting plate mounting groove 14 is located at one end of the first folding guardrail 3 near the folding guardrail mounting seat 8. The first limiting groove 15 is located at one end of the folding guardrail mounting seat 8 near the first folding guardrail 3. The limiting plate 16 is a rectangular plate structure, with one end movably inserted into the limiting plate mounting groove 14 and the other end movably inserted into the first limiting groove 15. The first folding guardrail 3 is located away from the folding guardrail mounting seat 8. A pull rod 18 is movably connected to one end of the limit plate 16. The pull rod 18 has a circular rod structure. One end of the pull rod 18 extends into the mounting groove 14 of the limit plate. The end of the pull rod 18 extending into the mounting groove 14 is fixed to the surface of the limit plate 16 away from the folding guardrail mounting seat 8. The other end of the pull rod 18 extends out from the surface of the first section of the folding guardrail 3. A pull block 19 is fixed to the end of the pull rod 18 extending out of the first section of the folding guardrail 3. The pull block 19 has a rectangular block structure. Two sets of limit springs 17 are fixed to the end of the limit plate 16 that extends into the mounting groove 14. The ends of the two sets of limit springs 17 away from the limit plate 16 are fixed to the inner wall of the mounting groove 14. The two sets of limit springs 17 are symmetrically distributed about the pull rod 18.

[0024] When the first folding guardrail 3 is in the upright position, the top side of the first folding guardrail 3 contacts the folding guardrail mounting base 8. One end of the limiting plate 16 is inserted into the limiting plate mounting groove 14, and the other end of the limiting plate 16 is inserted into the first limiting groove 15. A rotating shaft is fixed on the folding guardrail mounting base 8, and the rotating shaft is inserted into the first folding guardrail 3. At this time, the limiting plate 16 is located directly above the rotating shaft, so that the first folding guardrail 3 cannot rotate around the rotating shaft, thereby limiting the first folding guardrail 3 to the folding mounting base 8. The compressed limiting spring 17 generates a thrust on the limiting plate 16, pushing the limiting plate 16 into the first limiting groove 15, thereby maintaining the stability of the limiting mechanism. When the pull block 19 is pulled and the pull rod 18 is pulled out of the limiting plate mounting groove 14, the limiting plate 16 is completely pulled into the limiting plate mounting groove 14, thereby releasing the limiting.

[0025] Example 4: Based on Example 3, in order to realize the operation of the second limiting mechanism, a limiting rod mounting seat 21 is fixed on the second folding guardrail 4. The limiting rod mounting seat 21 has a rectangular block structure. The second limiting mechanism includes: a second limiting groove 20, a limiting rod mounting groove 22, and a limiting rod 23. Both the second limiting groove 20 and the limiting rod mounting groove 22 have a circular groove structure. The second limiting groove 20 is opened on the extended guardrail 5, and the limiting rod mounting groove 22 is opened on the limiting rod mounting seat 21. The limiting rod 23 has a circular rod structure. One end of the limiting rod 23 is rotatably inserted into the second limiting groove 20, and the other end of the limiting rod 23 is rotatably inserted into the limiting rod mounting groove 22. The limiting rod is installed... A screw hole 24 is provided at the end of the seat 21 away from the extended guardrail 5. The screw hole 24 is in communication with the limiting rod mounting groove 22. The wall of the screw hole 24 is provided with internal threads. A screw rod 6 is rotatably inserted into the screw hole 24. The screw rod 6 has a circular rod structure and external threads are provided on the rod body. The external threads of the screw rod 6 are engaged with the internal threads of the screw hole 24. The end of the screw rod 6 near the extended guardrail 5 extends into the limiting rod mounting groove 22, and the end of the screw rod 6 extending into the limiting rod mounting groove 22 is fixed to the end of the limiting rod 23 extending into the limiting rod mounting groove 22. The end of the screw rod 6 away from the extended guardrail 5 extends out of the screw hole 24. A knob 7 is fixed at the end of the screw rod 6 extending out of the screw hole 24. The knob 7 has a rectangular block structure.

[0026] When the first folding guardrail 3 is in a horizontal position and the second folding guardrail 4 is in a vertical position, the limiting rod mounting base 21 contacts the extended guardrail 5. Turning the knob 7, under the threaded connection between the screw 6 and the screw hole 24, causes the screw 6 to extend a longer length into the limiting rod mounting groove 22, thereby pushing one end of the limiting rod 23 into the second limiting groove 20. The other end of the limiting rod 23 remains in the limiting rod mounting groove 22. A rotating shaft is fixed to the bottom side of the second folding guardrail 4 via an extension plate, and the rotating shaft is inserted into the side of the first folding guardrail 3. At this time, the limiting rod 23 is positioned directly above the rotating shaft, preventing the second folding guardrail 4 from rotating around the shaft. This allows the limiting rod mounting base 21 to be positioned on the extended guardrail 5, thus limiting the second folding guardrail 4 to the extended guardrail 5. The threaded connection between the screw 6 and the screw hole 24 has a self-locking function, ensuring the stability of the limiting position. By turning the knob 7 in the opposite direction, the screw 6 extends a longer distance from the screw hole 24. The screw 6 pulls the limiting rod 23, causing the limiting rod 23 to retract completely into the limiting rod mounting groove 22, thereby releasing the limiting position.

[0027] In actual use, when it is necessary to load tall building materials or other items on the lifting platform 1, both the first folding guardrail 3 and the second folding guardrail 4 are in an upright state, and the first limiting mechanism is in the limit open state, limiting the top of the first folding guardrail 3 to the folding guardrail mounting base 8. The bottom of the first folding guardrail 3 is rotatably connected to the folding guardrail mounting base 8, thereby maintaining the upright state of the first folding guardrail 3. One end of the second folding guardrail 4 is fixed with a second clamping plate 10, and the end of the second clamping plate 10 fixed to the second folding guardrail 4 also abuts against the first folding guardrail 3. The other end of the second folding guardrail 4 is connected with a third clamping plate 12, and the third clamping plate 12 abuts against the other end of the first folding guardrail 3, thereby maintaining the upright state of the second folding guardrail 4. Tall building materials or other items can be placed against the second folding guardrail 4. The guardrail 2 and the first folding guardrail 3 together provide safety protection for personnel and items on the lifting platform 1. When it is necessary to adjust the scissor lift... When the platform is lowered for transport, the first limiting mechanism is released, and both the first folding guardrail 3 and the second folding guardrail 4 are rotated to a horizontal position. Then, the second folding guardrail 4 is rotated to an upright position, and the second limiting mechanism is activated. This connects the top of the second folding guardrail 4 to the top of the extended guardrail 5, maintaining the upright position of the second folding guardrail 4. This lowers the height of the scissor lift platform, facilitating its transport. Furthermore, when transporting taller materials is not required, the first folding guardrail 3 is laid flat, and the second folding guardrail 4 is raised. The first clamping plate 9 fixed to the first folding guardrail 3, after rotating with it, rests against the bottom of the lifting platform 1, maintaining its horizontal position and expanding the area of ​​the lifting platform 1. The guardrail 2, the second folding guardrail 4, and the extended guardrail 5 provide safety protection for personnel and goods on the lifting platform 1.

[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A security protection mechanism, comprising: A fixed guardrail (2) is fixed on a lifting platform (1). The fixed guardrail (2) is fixed on the lifting platform (1). The lifting platform (1) is fixed with a folding guardrail mounting seat (8). A first folding guardrail (3) is rotatably connected to the folding guardrail mounting seat (8). A second folding guardrail (4) is rotatably connected to the top of the first folding guardrail (3). An extension guardrail (5) is fixed on the first folding guardrail (3). A second card plate (10) is fixed at one end of the second folding guardrail (4). The second card plate (10) abuts against one end of the first folding guardrail (3). A third card plate (12) is slidably connected to the other end of the second folding guardrail (4). The third card plate (12) abuts against the other end of the first folding guardrail (3). A first card plate (9) is fixed on the first folding guardrail (3). A first limiting mechanism is provided between the first folding guardrail (3) and the folding guardrail mounting seat (8). A second limiting mechanism is provided between the second folding guardrail (4) and the extension guardrail (5).

2. The safety protection mechanism according to claim 1, characterized in that: The second section of the folding guardrail (4) is fixed with a third plate mounting seat (11). The third plate mounting seat (11) has a "U" shaped plate structure. The third plate (12) has a rectangular plate structure. The third plate (12) is movably inserted between the two sets of side plates of the third plate mounting seat (11). The top plate (13) is fixed at the top of the third plate (12). The top plate (13) has a rectangular plate structure. The bottom end of the top plate (13) abuts against the top of the third plate mounting seat (11).

3. The safety protection mechanism according to claim 1, characterized in that: The first limiting mechanism includes: a limiting plate mounting groove (14), a first limiting groove (15), and a limiting plate (16). The limiting plate mounting groove (14) and the first limiting groove (15) are both rectangular groove structures. The limiting plate mounting groove (14) is opened at one end of the first folding guardrail (3) near the folding guardrail mounting seat (8). The first limiting groove (15) is opened at one end of the folding guardrail mounting seat (8) near the first folding guardrail (3). The limiting plate (16) is a rectangular plate structure. One end of the limiting plate (16) is movably inserted into the limiting plate mounting groove (14), and the other end of the limiting plate (16) is movably inserted into the first limiting groove (15).

4. A safety protection mechanism according to claim 3, characterized in that: A pull rod (18) is movably inserted at one end of the first folding guardrail (3) away from the folding guardrail mounting base (8). The pull rod (18) has a circular rod structure. One end of the pull rod (18) extends into the mounting groove (14) of the limiting plate. The end of the pull rod (18) extending into the mounting groove (14) of the limiting plate is fixed on the surface of the limiting plate (16) away from the folding guardrail mounting base (8). The other end of the pull rod (18) extends out from the surface of the first folding guardrail (3). A pull block (19) is fixed at one end of the pull rod (18) extending out from the first folding guardrail (3). The pull block (19) has a rectangular block structure.

5. A safety protection mechanism according to claim 4, characterized in that: Two sets of limiting springs (17) are fixed at one end of the limiting plate (16) that extends into the limiting plate mounting groove (14). The ends of the two sets of limiting springs (17) that are away from the limiting plate (16) are fixed on the inner wall of the limiting plate mounting groove (14). The two sets of limiting springs (17) are symmetrically distributed about the pull rod (18).

6. A safety protection mechanism according to claim 1, characterized in that: The second section of the folding guardrail (4) is fixed with a limit rod mounting seat (21), which has a rectangular block structure.

7. A safety protection mechanism according to claim 6, characterized in that: The second limiting mechanism includes: a second limiting groove (20), a limiting rod mounting groove (22), and a limiting rod (23). Both the second limiting groove (20) and the limiting rod mounting groove (22) are circular groove structures. The second limiting groove (20) is opened on the extended guardrail (5), and the limiting rod mounting groove (22) is opened on the limiting rod mounting seat (21). The limiting rod (23) is a circular rod structure. One end of the limiting rod (23) is rotatably inserted into the second limiting groove (20), and the other end of the limiting rod (23) is rotatably inserted into the limiting rod mounting groove (22).

8. A safety protection mechanism according to claim 7, characterized in that: The end of the limiting rod mounting base (21) away from the extended guardrail (5) is provided with a screw hole (24), which is connected to the limiting rod mounting groove (22). The screw hole (24) is provided with an internal thread on the hole wall.

9. A safety protection mechanism according to claim 8, characterized in that: A screw (6) is rotatably inserted into the screw hole (24). The screw (6) has a circular rod structure and an external thread on the rod. The external thread of the screw (6) is engaged with the internal thread of the screw hole (24). The end of the screw (6) near the extended guardrail (5) extends into the limiting rod mounting groove (22), and the end of the screw (6) extending into the limiting rod mounting groove (22) is fixed to the end of the limiting rod (23) extending into the limiting rod mounting groove (22). The end of the screw (6) away from the extended guardrail (5) extends out from the screw hole (24). A knob (7) is fixed to the end of the screw (6) extending out of the screw hole (24). The knob (7) has a rectangular block structure.

10. A scissor lift platform, characterized in that: Includes the security protection mechanism described in any one of claims 1-9.

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