A safety guard of the step-on type

Abstract

The utility model discloses a kind of tread type safety protection devices, it includes fixed rack;Movable platform, one end is rotatably connected on the fixed rack by platform pivot;Spring, between the movable platform and the fixed rack is connected;Movable net lifting mechanism, including movable net, connecting hook, lifting connecting piece, lifting wheel and counterweight;Bolt mechanism, including swing arm mechanism, bolt rod, reset spring and the bolt connecting seat fixed on the fixed rack.The utility model utilizes the weight of person when treading steel plate to drive swing arm mechanism rotation, swing arm mechanism drives bolt rod to separate from limiting area, counterweight is lowered by weight after being unlimited and drives movable guard net to pop up to form protective barrier, prevent person from falling to ground from the hole in front of tread plate.The safety protection is needed to be removed, manually push counterweight to high position to make bolt rod extend, so that movable guard net is in stowed state, without affecting the normal operation of conveying trolley.

Description

Technical Field

[0001] This utility model belongs to the technical field of logistics conveying equipment, specifically relating to a safety protection device for preventing people from falling from open openings at heights. Background Technology

[0002] In logistics transportation and automated warehousing, lifting equipment is frequently used to transfer goods between different floors or at different heights. When the lifting platform descends or moves, it creates an open opening in its original location. To prevent on-site personnel from accidentally entering this area and falling, certain safety precautions are usually taken.

[0003] Currently, the most commonly used safety protection measures in the industry are electrical warning methods such as light gratings and audible and visual alarms. These devices use infrared sensing or sound and light to alert personnel to the presence of dangerous areas ahead. However, these existing detection and warning methods have the following obvious technical defects: 1. Insufficient reliability: Electrical warning devices rely on various electronic components, such as sensors, switches, and wiring. During use, these components may malfunction or fail due to aging, moisture, poor contact, or accidental collisions. Once an electrical switch malfunctions, it will be unable to detect whether someone is approaching, thus losing its intended warning function. 2. Limited protective capability: These devices essentially only serve as warnings and reminders and cannot form a physical barrier. Even if the alarm device is working properly, in certain situations, such as when a person slips on a wet surface or is unable to stop in time due to inertia, there is still a risk of falling. The warning system cannot provide substantial physical protection to prevent accidents.

[0004] Existing electrical warning systems are prone to malfunctions that prevent them from issuing warnings, and they cannot provide effective physical protection when personnel accidentally enter openings, making it difficult to fully ensure personnel safety. Therefore, a more reliable safety protection solution is urgently needed to address these issues. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and address the potential risks of existing safety protection measures, such as the loss of warning effectiveness due to aging or poor contact of electrical components, which rely on electrical warning methods like light gratings and sound and light. Furthermore, these methods only serve a warning function and cannot provide substantial physical barriers, making it difficult to effectively prevent people from falling due to tripping or inertia. Therefore, this invention provides a purely mechanical, step-based safety protection device with a reliable structure that can form an effective physical barrier.

[0006] This utility model discloses a step-on safety protection device, including a fixed frame; a movable platform, one end of which is rotatably connected to the fixed frame via a platform pivot; a spring connected between the movable platform and the fixed frame; a movable net lifting mechanism, including a movable net, a connecting hook, a lifting connector, a lifting wheel, and a counterweight; and a pin mechanism, including a swing arm mechanism, a pin rod, a return spring, and a pin connector fixed to the fixed frame; wherein, one end of the movable net is fixed to the fixed frame and the other end is fixed to the connecting hook; the lifting wheel is fixed to the fixed frame; the lifting connector, after passing around the lifting wheel, is connected at one end to the connecting hook and at the other end to the counterweight; the pin connector is provided with a first upright plate, a second upright plate, and a third upright plate arranged in parallel, the distance between the first upright plate and the second upright plate corresponding to the thickness of the connecting hook, and the second upright plate and the third upright plate are provided with a means for the pin to be inserted. The pin rod passes through a guide hole, and an annular boss is provided on the outer circumference of the pin rod. The pin rod passes through the guide hole, and one end of it passes through the guide hole on the second upright plate and is located between the first and second upright plates. The return spring is fitted on the pin rod, with one end in contact with the annular boss and the other end in contact with the third upright plate. The swing arm mechanism includes a pin swing plate. After the pin rod passes through the guide hole on the third upright plate, it is connected to the pin swing plate through a U-shaped block and a pin rod swing shaft. The swing arm mechanism is rotatably connected to the fixed frame through a swing arm shaft, and part of the swing arm mechanism is located below the movable platform. When the connecting hook is in the locked position, it is hooked on the end of the pin rod located between the first and second upright plates. When the movable platform pivots downward, it abuts against and drives the swing arm mechanism to rotate, thereby driving the pin rod to move horizontally through the pin swing plate and disengaging from the connecting hook.

[0007] Preferably, the swing arm mechanism further includes a platform support plate, which and the pin swing plate are both fixed on the swing arm shaft. The platform support plate is located below the movable platform and is used to be abutted by it.

[0008] Preferably, the platform support plate is an L-shaped plate.

[0009] Preferably, the swing arm shaft is mounted on the fixed frame via a seated bearing.

[0010] Preferably, the lifting connector is a chain or a wire rope.

[0011] Preferably, the movable platform includes a platform and a platform pivot, with the upper end of the spring fixed to the platform and the lower end fixed to the fixed frame.

[0012] Preferably, the U-shaped block is fixedly connected to one end of the pin rod.

[0013] Preferably, the guide holes on the second and third upright plates are aligned with each other.

[0014] Preferably, the annular boss is located between the second and third upright plates.

[0015] Preferably, it includes two platform support plates arranged axially spaced along the swing arm axis, and two pin swing plates arranged axially spaced along the swing arm axis.

[0016] The beneficial effects of this utility model are as follows: This utility model adopts a purely mechanical structure, and through the ingenious linkage of gravity, levers, and springs, it fundamentally avoids the risk of system failure caused by aging electrical components, moisture, power outages, or poor contact. The action triggering is direct and reliable. More importantly, when personnel accidentally enter a dangerous area, the device can automatically and quickly raise a physical protective net to form an effective physical barrier, transforming the traditional passive "warning" into active "physical protection," directly preventing personnel from advancing or falling, greatly improving the level of safety. At the same time, this device also excels in practicality and economy: its spring structure allows key components to automatically reset after triggering; operators only need to pull down and re-attach the movable net, making operation simple and reusable. Furthermore, the device's components are all common mechanical standard parts or simply machined parts, with a compact overall structure design. This not only results in low manufacturing costs and convenient installation but also simple and economical maintenance, making it a highly valuable and cost-effective safety solution. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments disclosed in this invention, the accompanying drawings of the embodiments will be briefly described below. These drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention.

[0018] Figure 1 This is a schematic diagram of the overall structure of a step-type safety protection device provided in an embodiment of the present utility model.

[0019] Figure 2 for Figure 1 A schematic diagram of the structure of the activity platform.

[0020] Figure 3 This is a schematic diagram showing the cooperation relationship between the pin mechanism and the movable net lifting mechanism in an embodiment of this utility model.

[0021] Figure 4 This is an enlarged schematic diagram showing the cooperation between the pin mechanism and the movable net lifting mechanism in an embodiment of this utility model. Figure 5 This is a schematic diagram illustrating the working principle of the lifting mechanism of the movable net in this embodiment of the present invention.

[0022] Figure 6 This is a schematic diagram of the swing arm mechanism in an embodiment of the present invention.

[0023] Figure 7 This is a schematic diagram of the structure of the lifting mechanism of the movable net in the embodiment of this utility model.

[0024] Figure 8 This is a partially enlarged schematic diagram showing the engagement state of the pin and the connecting hook in an embodiment of this utility model.

[0025] Explanation of reference numerals in the attached figures: 1. Activity platform; 1.1. Spring; 1.2. Platform; 1.3. Platform pivot; 2. Pin Mechanism; 2.1. Swing Arm Mechanism; 2.1.1. Platform Support Plate; 2.1.2. Pin Swing Plate; 2.1.3. Swing Arm Shaft; 2.2. Pin Rod Swing Shaft; 2.3. Pin Rod; 2.4. Return Spring; 2.5. Pin Connecting Seat; 2.6. First Vertical Plate; 2.7. Second Vertical Plate; 2.8. Third Vertical Plate; 2.9. U-shaped Block; 3. Movable Net Lifting Mechanism; 3.1 Movable Net; 3.2 Connecting Hook; 3.3 Lifting Connector; 3.4 Lifting Wheel; 3.5 Counterweight; 4. Fix the frame. Detailed Implementation

[0026] The technical solutions (including preferred technical solutions) of the present invention will be further described in detail below with reference to the accompanying drawings and by way of listing some optional embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0027] like Figure 1-8 As shown in the figure, the embodiment of this utility model provides a step-on safety protection device, the overall structure of which includes a movable platform 1, a pin mechanism 2, a movable net lifting mechanism 3, and a fixed frame 4. The fixed frame 4 is the mounting base of the entire device, and all other moving parts are directly or indirectly mounted on the fixed frame 4.

[0028] The movable platform 1 of this utility model includes a spring 1.1, a platform 1.2, and a platform pivot 1.3. The upper end of the spring 1.1 is fixed to the platform 1.2, and its lower end is fixed to the fixed frame 4. The spring 1.1 supports the platform 1.2, keeping it horizontal when no external force is applied. The platform 1.2 and the platform pivot 1.3 are rigidly connected, and the platform pivot 1.3 is mounted on the fixed frame 4 via bearings, allowing the entire movable platform 1 to pivot around it.

[0029] The pin mechanism 2 of this utility model is the core for realizing interlocking and triggering. It includes a swing arm mechanism 2.1, a pin rod swing shaft 2.2, a pin rod 2.3, a return spring 2.4, and a pin connecting seat 2.5.

[0030] The swing arm mechanism 2.1 includes a platform support plate 2.1.1, a pin-mounted swing plate 2.1.2, and a swing arm shaft 2.1.3. The platform support plate 2.1.1, the pin-mounted swing plate 2.1.2, and the swing arm shaft 2.1.3 are rigidly connected. The swing arm shaft 2.1.3 is mounted on the fixed frame 4 via a bearing seat and can rotate freely. In this embodiment, the platform support plate 2.1.1 is L-shaped, with two plates arranged at intervals along the axial direction of the swing arm shaft 2.1.3; two pin-mounted swing plates 2.1.2 are also arranged at intervals along the axial direction of the swing arm shaft 2.1.3, with the two platform support plates 2.1.1 located between the two pin-mounted swing plates 2.1.2. The upper end of the platform support plate 2.1.1 is located below the platform 1.2, with a very small gap between them.

[0031] The pin connector 2.5 is fixed to the fixed frame 4, on which a first upright plate 2.6, a second upright plate 2.7, and a third upright plate 2.8 are arranged in parallel. The distance between the first upright plate 2.6 and the second upright plate 2.7 corresponds to the thickness of the connecting hook 3.2, which will be described later. The second upright plate 2.7 and the third upright plate 2.8 are provided with coaxial guide holes that mate with the pin rod 2.3, for guiding and ensuring that the pin rod 2.3 can be accurately inserted and withdrawn.

[0032] The pin 2.3 passes horizontally through the guide hole. An annular boss is provided on its outer circumference. A return spring 2.4 is fitted onto the pin 2.3, with one end contacting the annular boss and the other end contacting the third vertical plate 2.8. After passing through the guide hole on the third vertical plate 2.8, one end of the pin 2.3 is connected to the pin swing shaft 2.2 via a U-shaped block 2.9. The pin swing shaft 2.2 is installed in the hole of the pin swing plate 2.1.2, thus realizing the transmission connection between the swing arm mechanism 2.1 and the pin 2.3. The other end of the pin 2.3 passes through the guide hole on the second vertical plate 2.7 and is located between the first vertical plate 2.6 and the second vertical plate 2.7, for attaching the connecting hook 3.2.

[0033] The movable net lifting mechanism 3 of this utility model includes a movable net 3.1, a connecting hook 3.2, a lifting connector 3.3, a lifting wheel 3.4, and a counterweight 3.5. The lower end of the movable net 3.1 is fixed to the fixed frame 4, and the upper end is fixed to the connecting hook 3.2. The lifting wheel 3.4 is fixed to the upper part of the fixed frame 4. The lifting connector 3.3 is made of a flexible material such as a chain or wire rope. It passes around the lifting wheel 3.4, with one end fixed to the upper end of the connecting hook 3.2 and the other end fixed to the counterweight 3.5.

[0034] The overall workflow of the machine is as follows: When a person steps onto the movable platform 1, the spring 1.1 is compressed, and the movable platform 1 rotates downward around the platform pivot 1.3. After moving downward a certain distance, the movable platform 1 contacts the platform support plate 2.1.1 and pushes it to rotate downward. Since the platform support plate 2.1.1, the pin swing plate 2.1.2, and the swing arm shaft 2.1.3 are rigidly connected, the rotation of the platform support plate 2.1.1 will drive the entire swing arm mechanism 2.1 to rotate around the swing arm shaft 2.1.3, thereby driving the pin swing plate 2.1.2 to rotate. The pin swing plate 2.1.2 then pulls the pin rod 2.3 to the left in the direction shown in the figure through the pin rod swing shaft 2.2 and the U-shaped block 2.9, overcoming the elastic force of the return spring 2.4, and finally disengaging the pin rod 2.3 from the connecting hook 3.2.

[0035] Once the connection is disengaged, the counterweight 3.5 will fall rapidly under gravity, pulling the movable net 3.1 upwards via the lifting connector 3.3, forming a physical protective barrier. When a person leaves the movable platform 1, the spring 1.1 resets the platform, and the swing arm mechanism 2.1 also resets. At this time, the return spring 2.4 pushes the pin 2.3 back to its initial extended position, ready to be manually engaged again to complete the reset.

[0036] It will be readily understood by those skilled in the art that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, combinations, substitutions, improvements, etc., made under the spirit and principles of the present invention are included within the protection scope of the present invention.

Claims

1. A foot-operated safety protection device, characterized in that, The system includes a fixed frame (4); a movable platform (1), one end of which is rotatably connected to the fixed frame (4) via a platform pivot (1.3); a spring (1.1) connected between the movable platform (1) and the fixed frame (4); a movable net lifting mechanism (3), including a movable net (3.1), a connecting hook (3.2), a lifting connector (3.3), a lifting wheel (3.4), and a counterweight (3.5); and a pin mechanism (2), including a swing arm mechanism (2.1), a pin rod (2.3), a return spring (2.4), and a pin connecting seat (2.5) fixed to the fixed frame (4), wherein one end of the movable net (3.1) is fixed to the fixed frame. (4) The upper end is fixed to the connecting hook (3.2); the lifting wheel (3.4) is fixed to the fixed frame (4); the lifting connector (3.3) passes around the lifting wheel (3.4) and one end is connected to the connecting hook (3.2), and the other end is connected to the counterweight (3.5); the pin connecting seat (2.5) is provided with a first vertical plate (2.6), a second vertical plate (2.7) and a third vertical plate (2.8) arranged in parallel, the distance between the first vertical plate (2.6) and the second vertical plate (2.7) corresponds to the thickness of the connecting hook (3.2), and the second vertical plate (2.7) and the third vertical plate (2.8) are provided with a means for the pin rod (2 .3) The guide hole through which the pin (2.3) passes; an annular boss is provided on the outer circumferential surface of the pin (2.3), the pin (2.3) passes through the guide hole, and one end of the pin passes through the guide hole on the second vertical plate (2.7) and is located between the first vertical plate (2.6) and the second vertical plate (2.7); the return spring (2.4) is fitted on the pin (2.3), one end of which contacts the annular boss, and the other end of which contacts the third vertical plate (2.8); the swing arm mechanism (2.1) includes a pin swing plate (2.1.2), and the pin (2.3) passes through the guide hole on the third vertical plate (2.8) and passes through the U-shaped block (2.9) and the pin swing shaft (2.1.2). 2) Connected to the pin swing plate (2.1.2); the swing arm mechanism (2.1) is rotatably connected to the fixed frame (4) via the swing arm shaft (2.1.3), and part of the swing arm mechanism (2.1) is located below the movable platform (1); the connecting hook (3.2) is hooked on the end of the pin rod (2.3) located between the first upright plate (2.6) and the second upright plate (2.7) when the movable platform (1) pivots downwards, it abuts against and drives the swing arm mechanism (2.1) to rotate, thereby driving the pin rod (2.3) to move horizontally through the pin swing plate (2.1.2) and disengaging from the connecting hook (3.2).

2. The foot-operated safety protection device according to claim 1, characterized in that, The swing arm mechanism (2.1) also includes a platform support plate (2.1.1), which and the pin swing plate (2.1.2) are both fixed on the swing arm shaft (2.1.3). The platform support plate (2.1.1) is located below the movable platform (1) and is abutted by it.

3. The foot-operated safety protection device according to claim 2, characterized in that, The platform support plate (2.1.1) is an L-shaped plate.

4. The foot-operated safety protection device according to claim 1, characterized in that, The swing arm shaft (2.1.3) is mounted on the fixed frame (4) via a seated bearing.

5. The foot-operated safety protection device according to claim 1, characterized in that, The lifting connector (3.3) is a chain or a wire rope.

6. The foot-operated safety protection device according to claim 1, characterized in that, The active platform (1) includes a platform (1.2) and a platform pivot (1.3). The upper end of the spring (1.1) is fixed to the platform (1.2), and the lower end is fixed to the fixed frame (4).

7. The foot-operated safety protection device according to claim 1, characterized in that, The U-shaped block (2.9) is fixedly connected to one end of the pin rod (2.3).

8. The foot-operated safety protection device according to claim 1, characterized in that, The guide holes on the second vertical plate (2.7) and the third vertical plate (2.8) are arranged coaxially.

9. The foot-operated safety protection device according to claim 1, characterized in that, The annular boss is located between the second vertical plate (2.7) and the third vertical plate (2.8).

10. The foot-operated safety protection device according to claim 2, characterized in that, It includes two platform support plates (2.1.1) spaced apart along the axial direction of the swing arm axis (2.1.3), and two pin swing plates (2.1.2) spaced apart along the axial direction of the swing arm axis (2.1.3).

Images