Automatic telescopic guardrail

Abstract

The present invention belongs to the field of protective guardrail application equipment, and in particular, relates to an automatic retractable guardrail that is easy to store, including a guardrail, a movable pulley, a wire rope, a counterweight, an upper block, a lower block, a guide rod, and a guide sleeve. The guide sleeve is fixed on a lifting platform, the guide rod is fixed on the guardrail, the movable pulley is fixed below the lifting platform, the wire rope passes through the movable pulley, one end is fixed below the guardrail, and the other end is connected to the counterweight, the weight of the counterweight is greater than the weight of the guardrail, the upper block is fixed on the side of the lifting platform, and the lower block is fixed below the lifting platform. When the lifting platform rises to a certain height, the counterweight pulls the guardrail up through the wire rope, and when the lifting platform drops to a certain height, the guardrail drops by its own weight. The present invention relies on gravity to achieve the extension and retraction of the guardrail, does not rely on electrical or other means to drive, saves energy, and does not occupy the space above the lifting platform when the guardrail is retracted, which is convenient for vehicles to pass on the platform.

Description

Technical Field

[0001] The invention belongs to the field of protective guardrail application equipment, and in particular relates to an automatic telescopic guardrail that is easy to store. Background Art

[0002] In some special occasions, such as loading and unloading yards, the lifting platform is usually fixed. When loading goods into the vehicle, the goods are transported to the lifting platform, and after the platform rises to the same height as the vehicle, the goods on the lifting platform are moved to the vehicle, and then the platform is lowered. In order to facilitate the passage of loading and unloading vehicles, the lifting platform is flush with the ground when it is lowered to the lowest position.

[0003] When the lifting platform is raised or lowered, if there are no guardrails around the platform, there is a safety hazard of goods or people falling when the lifting platform rises to a certain height. If fixed guardrails are installed around the lifting platform, when the lifting platform descends to the ground, the fixed guardrails will affect the passage of vehicles and also pose a safety hazard. Summary of the invention

[0004] In view of the above technical problems, the present invention proposes an automatic retractable guardrail that is easy to store. The automatic retractable guardrail is usually placed below the lifting platform and is flush with the ground. The automatic retractable guardrail is linked with the lifting platform, that is, the guardrail extends when the lifting platform rises, and retracts when the lifting platform descends, thereby realizing automatic retraction in the vertical direction. When the platform is retracted, it does not occupy the space above the platform, meeting the on-site use requirements.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is an automatic telescopic guardrail, including a guardrail, a movable pulley, a steel wire rope, a counterweight, an upper block, a lower block, a guide rod, and a guide sleeve. The guide sleeve is fixed on the lifting platform, and the guide rod is fixed on the guardrail. The guide rod can slide up and down in the guide sleeve, thereby constraining the movement of the guardrail so that it can only move up and down relative to the lifting platform. The movable pulley is fixed below the lifting platform, and the steel wire rope passes through the movable pulley, one end of which is fixed below the guardrail, and the other end is connected to the counterweight, the weight of the counterweight is greater than the weight of the guardrail, the upper block is fixed on the side of the lifting platform, and the lower block is fixed on the bottom plate of the lifting platform.

[0006] When the lifting platform rises, the movable pulley rises accordingly, pulling the wire rope up at the same time. When the wire ropes on both sides of the movable pulley are tightened, because the weight of the counterweight is greater than the weight of the guardrail, the counterweight does not rise at this time, and the guardrail begins to extend relative to the lifting platform and rises at the same time as the lifting platform. When the bottom of the guardrail hits the lower stopper, the guardrail stops rising relative to the lifting platform, but still rises with the lifting platform and the counterweight until the lifting platform stops.

[0007] When the lifting platform descends, the guardrail and counterweight descend synchronously with it. When the counterweight contacts the bottom plate of the lifting mechanism, the counterweight no longer pulls the guardrail through the wire rope. At this time, the guardrail descends relative to the lifting platform under the action of its own gravity until the upper part of the guardrail contacts the upper stopper of the lifting platform. The guardrail stops descending and descends synchronously with the lifting platform until the lifting platform descends and is flush with the ground.

[0008] Preferably, the positions of the upper stopper and the lower stopper are adjustable, and the retraction and extension height of the guardrail can be adjusted by adjusting the positions of the upper stopper and the lower stopper of the guardrail.

[0009] Preferably, the length of the wire rope is adjustable, and the lifting platform can be adjusted to a suitable height at which the guardrail begins to extend or retract by adjusting the length of the wire rope.

[0010] Preferably, the speed of extension and retraction of the guardrail can be adjusted by adjusting the weight of the counterweight.

[0011] Preferably, sprockets and chains replace movable pulleys and wire ropes to control the extension and retraction of the guardrail.

[0012] Compared with the prior art, the advantages and positive effects of the present invention are:

[0013] 1. The present invention relies on gravity to achieve the extension and retraction of the guardrail, and does not rely on energy-consuming methods such as electricity to drive, thus saving energy.

[0014] 2. When the guardrail is retracted, it does not occupy the space above the lifting platform, making it convenient for vehicles to pass on the platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 It is a schematic diagram of an automatic telescopic guardrail when the lifting platform is at the lower limit position;

[0017] Figure 2 A schematic diagram of an automatic telescopic guardrail when the lifting platform is at the upper limit position;

[0018] In the above figures, 1. lifting platform; 2. guardrail; 3. guide sleeve; 4. upper stop block; 5. lower stop block; 6. guide rod; 7. lifting mechanism base; 8. counterweight; 9. wire rope; 10. movable pulley; 11. lifting mechanism. DETAILED DESCRIPTION

[0019] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0020] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0021] Embodiment 1, as Figure 1 , Figure 2 As shown, an automatic telescopic guardrail includes a guardrail 2, a movable pulley 10, a steel wire rope 9, a counterweight 8, an upper block 4, a lower block 5, a guide rod 6, and a guide sleeve 3. The guide sleeve 3 is fixed on the lifting platform 1, and the lifting mechanism 11 can drive the lifting platform 1 to move up and down. The guide rod 6 is fixed on the guardrail 2, and the guide rod 6 can slide up and down in the guide sleeve 3, thereby constraining the movement of the guardrail so that it can only move up and down relative to the lifting platform. The movable pulley 10 is fixed below the lifting platform 1, and the steel wire rope 9 passes through the movable pulley 10, one end of which is fixed below the guardrail 2, and the other end is connected to the counterweight 8, the weight of the counterweight 8 is greater than the weight of the guardrail 2, the upper block 4 is fixed on the side of the lifting platform 1, and the lower block 5 is fixed below the lifting platform 1.

[0022] When the lifting mechanism 11 drives the lifting platform 1 to rise, the movable pulley 10 rises with the lifting platform 1, and the upper block 4 of the lifting platform 1 drives the guardrail 2 to rise synchronously, and at the same time pulls the wire rope 9 to rise. When the wire ropes 9 on both sides of the movable pulley 10 are tightened, because the weight of the counterweight 8 is greater than the weight of the guardrail 2, the counterweight 8 does not rise at this time, and the guardrail 2 begins to extend upward relative to the lifting platform 1 and rises at the same time as the lifting platform. When the bottom of the guardrail 2 hits the lower block 5, the guardrail 2 stops rising relative to the lifting platform 1, but still rises together with the lifting platform 1 together with the counterweight until the lifting platform stops.

[0023] When the lifting platform 1 descends, the guardrail 2 and the counterweight 8 descend together. When the counterweight 8 contacts the upper plane of the lifting mechanism base 7, the counterweight 8 no longer pulls the guardrail through the wire rope. At this time, the guardrail 2 descends relative to the lifting platform 1 under the action of its own gravity until the guardrail 2 contacts the upper stopper 4 of the lifting platform 1. The guardrail 2 stops descending and descends synchronously with the lifting platform 1 until the lifting platform 1 stops.

Claims

1. An automatic telescopic guardrail, comprising a guardrail, a movable pulley, a steel wire rope, a counterweight, an upper block, a lower block, a guide rod, and a guide sleeve, characterized in that: The guide sleeve is fixed on the lifting platform, the guide rod is fixed on the guardrail, the movable pulley is fixed under the lifting platform, the wire rope passes through the movable pulley, one end of which is fixed under the guardrail, and the other end is connected to the counterweight; the upper stopper is fixed on the side of the lifting platform, and the lower stopper is fixed under the lifting platform; when the lifting mechanism drives the lifting platform to rise, the movable pulley rises with the lifting platform, and the upper stopper on the lifting platform drives the guardrail to rise synchronously, and at the same time pulls the wire rope to rise. When the wire ropes on both sides of the movable pulley are tightened, because the weight of the counterweight is greater than the weight of the guardrail, the counterweight does not rise at this time, and the guardrail begins to rise. It extends upward relative to the lifting platform and rises simultaneously with the lifting platform. When the bottom of the guardrail hits the lower stopper, the guardrail stops rising relative to the lifting platform, but still rises together with the lifting platform and the counterweight until the lifting platform stops. When the lifting platform descends, the guardrail and the counterweight descend together. When the counterweight contacts the upper plane of the lifting mechanism base, the counterweight no longer pulls the guardrail through the wire rope. At this time, the guardrail descends relative to the lifting platform under the action of its own gravity until the guardrail contacts the upper stopper of the lifting platform. The guardrail stops descending and descends synchronously with the lifting platform until the lifting platform stops.

2. The automatic telescopic guardrail according to claim 1, characterized in that: The guide rod slides up and down in the guide sleeve, thereby restricting the movement of the guardrail so that it can only move up and down relative to the lifting platform.

3. The automatic telescopic guardrail according to claim 1, characterized in that: The weight of the counterweight is greater than the weight of the guardrail.

4. The automatic telescopic guardrail according to claim 1, characterized in that: The positions of the upper stopper and the lower stopper are adjustable, so that the retracted and extended heights of the guardrail can be adjusted.

5. The automatic telescopic guardrail according to claim 1, characterized in that: The length of the wire rope is adjustable. By adjusting the length of the wire rope, the guardrail can be extended or retracted when the lifting platform is at a suitable height.

6. The automatic telescopic guardrail according to claim 1, characterized in that: The speed of guardrail extension and retraction can be adjusted by adjusting the weight of the counterweight.

7. The automatic telescopic guardrail according to claim 1, characterized in that: Sprockets and chains replace movable pulleys and wire ropes to control the extension and retraction of guardrails.

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