A safety fence device
By designing a safety net device that includes a protective shell, a retraction mechanism, and a locking mechanism, the problems of easy damage and high maintenance costs of existing safety nets are solved, achieving reliable storage and convenient use of the safety net.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGZHOU URBAN CONSTR ENG GENERAL CONTRACTING CO LTD
- Filing Date
- 2025-05-27
- Publication Date
- 2026-05-22
AI Technical Summary
Existing security nets suffer from problems such as easy damage when folded for storage and increased labor maintenance costs.
Design a safety net device that includes a protective shell, a shrinking mechanism, a safety net assembly, and a locking mechanism. The safety net fabric is wound and stored using a spring and a lifting shaft, and its automatic retraction is restricted by the locking mechanism to avoid damage caused by folding and increased maintenance costs.
This achieves reliable storage of the safety net, avoiding damage caused by folding and increased manual maintenance costs, while improving ease of use and equipment lifespan.
Smart Images
Figure CN224266443U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of safety protection technology, and in particular to a safety protection net device. Background Technology
[0002] Safety nets are protective nets installed under or beside high-altitude construction equipment to prevent accidents caused by falling people or objects. A safety net consists of a net body, edge ropes, tie ropes, and reinforcing ropes. The net body is woven from ropes and has diamond or square mesh patterns.
[0003] Existing safety nets are typically stored by folding, but since the netting is usually made of polyester or PVC, repeated folding can lead to localized stress concentration in the fibers, accelerating material fatigue and reducing tensile strength and abrasion resistance. Furthermore, objects can only be folded a limited number of times, and the folded netting still occupies a significant amount of storage space, causing inconvenience. In addition, the folded areas need to be inspected to ensure their integrity and prevent damage during use that would render the net ineffective, significantly increasing maintenance costs. Utility Model Content
[0004] The purpose of this invention is to provide a safety net device that solves the problems of easy damage and increased manual maintenance costs caused by the folding and storage of existing safety nets.
[0005] To achieve the above objectives, this utility model provides a safety net device, which includes a protective shell, a retraction mechanism, a safety net assembly, and a locking mechanism;
[0006] The direction in which the protective shell extends is defined as a first direction, and a storage cavity extending along the first direction is provided in the protective shell; a first opening is provided on the outer periphery of the protective shell, and the first opening communicates with the storage cavity;
[0007] The retraction mechanism includes a fixed shaft and a spring; the fixed shaft extends along a first direction and is fixedly disposed in the receiving cavity, the spring is wound radially around the fixed shaft on the outer periphery of the fixed shaft, and one end of the spring is fixedly connected to the fixed shaft.
[0008] The safety net assembly includes a safety net fabric and a lifting shaft; the lifting shaft is located on the outside of the protective shell and extends along a first direction; one end of the safety net fabric is connected to the end of the spring away from the fixed shaft and is wound around the fixed shaft; the other end of the safety net fabric extends outward through the first opening and is fixedly connected to the lifting shaft.
[0009] The locking mechanism includes a moving rod, a torsion spring, and a stop; the moving rod and the stop are rotatably connected, and a torsion spring is sleeved at the connection position between the moving rod and the stop, so that the moving rod and the stop are set at a certain angle.
[0010] The protective shell is also provided with a movable groove, which communicates with the storage cavity. The movable groove has a locking position and an unlocking position. The movable rod passes through the movable groove and can move between the locking position and the unlocking position. The storage cavity is provided with a limiting groove.
[0011] When the moving rod is in the locked position, the end of the stop away from the moving rod abuts against the safety net; when the moving rod is in the unlocked position, at least part of the moving rod and at least part of the stop are engaged in the limiting groove, and the end of the stop away from the moving rod is away from the safety net.
[0012] Furthermore, the retraction mechanism also includes a spring box;
[0013] The spring box is sleeved on the outer periphery of the fixed shaft and fixedly connected to the protective shell;
[0014] The spring box has a second opening that penetrates its inner and outer surfaces. The end of the spring away from the fixed shaft extends out from the second opening and is connected to the safety net.
[0015] Furthermore, the contraction mechanism includes two spring-loaded springs;
[0016] The two spring-loaded springs are respectively disposed at both ends of the fixed shaft in the first direction;
[0017] The spring box has two second openings, and each second opening corresponds to a mainspring.
[0018] Furthermore, the safety net is covered with carbon steel strips on both sides in the first direction;
[0019] The carbon steel strip and the spring are arranged in a one-to-one correspondence, and the end of the spring away from the fixed shaft is connected to the carbon steel strip.
[0020] Furthermore, the fixed shaft is provided with a fixing groove, which extends inward along the axial direction of the fixed shaft;
[0021] The spring is fixedly connected to the fixed shaft via the fixed groove.
[0022] Furthermore, it includes two of the aforementioned locking mechanisms;
[0023] The protective shell has movable grooves on the outer periphery of both ends in the first direction, and a movable rod passes through the movable groove.
[0024] Furthermore, the protective shell includes a shell and a cover;
[0025] The shell is hollow with openings at both ends, and the two ends of the shell are detachably connected to the cover.
[0026] The spring box is fixedly connected to one of the covers.
[0027] Furthermore, a lifting strap is fixedly provided on the lifting shaft.
[0028] Compared with the prior art, the safety net device provided by this utility model has the following advantages:
[0029] This utility model provides a safety net device, which includes a protective shell, a retraction mechanism, a safety net assembly, and a locking mechanism. One end of the safety net is connected to the end of a spring away from the fixed shaft and is wound around the fixed shaft. The other end extends outward through a first opening and is fixedly connected to a lifting shaft. This allows the safety net to be wound around the outer circumference of the fixed shaft and stored in the storage cavity when not in use. The safety net can be pulled out for use by pulling the lifting shaft. After use, when the safety net is pulled out, the spring connected to the safety net is stretched, releasing the fixation to the lifting shaft. The spring returns under elastic force, thereby pulling the safety net back into the storage cavity and rewinding it to the outer circumference of the fixed shaft for storage. Thus, storing the safety net by winding it avoids the problems of easy damage and increased maintenance costs caused by folding the safety net during storage. In addition, the safety net device is equipped with a locking mechanism. By moving the movable rod between the locked and unlocked positions, when the movable rod is in the locked position, the end of the stop member away from the movable rod abuts against the safety net fabric, thereby restricting the movement of the safety net fabric and preventing it from automatically retracting and winding under the action of the spring. When the movable rod is in the unlocked position, the end of the stop member away from the movable rod moves away from the safety net fabric, and the stop member no longer restricts the safety net fabric. Without external force to fix the safety net fabric, it will automatically retract and wind under the action of the spring. Thus, the locking mechanism achieves the limiting and fixing of the safety net fabric, facilitating user operation. Attached Figure Description
[0030] Figure 1 This is a three-dimensional structural schematic diagram of a safety protection net device according to an embodiment of this utility model;
[0031] Figure 2 This is a cross-sectional schematic diagram of a safety net device according to an embodiment of the present invention, showing the movable rod in the locked position.
[0032] Figure 3 This is a cross-sectional schematic diagram of a safety net device according to an embodiment of the present invention, showing the movable rod in the unlocked position.
[0033] Figure 4 This is a cross-sectional structural schematic diagram of a safety protection net device according to an embodiment of the present utility model.
[0034] In the diagram, 100 is the safety net device; 1 is the protective shell; 10 is the storage cavity; 101 is the first opening; 102 is the moving groove; 103 is the limiting groove; 11 is the shell; 12 is the cover; 13 is the connecting nut; 130 is the connecting hole; 2 is the retraction mechanism; 21 is the fixed shaft; 22 is the spring; 23 is the spring box; 230 is the second opening; 3 is the safety net assembly; 31 is the safety net cloth; 32 is the lifting shaft; 33 is the carbon steel belt; 34 is the lifting strap; 4 is the locking mechanism; 41 is the moving rod; 42 is the torsion spring; and 43 is the stop. Detailed Implementation
[0035] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.
[0036] like Figures 1-4 As shown, a safety net device 100 according to an embodiment of the present invention includes a protective shell 1, a retraction mechanism 2, a safety net assembly 3, and a locking mechanism 4;
[0037] The direction in which the protective shell 1 extends is defined as the first direction X. A storage cavity 10 extending along the first direction X is provided in the protective shell 1. A first opening 101 is provided on the outer periphery of the protective shell 1, and the first opening 101 communicates with the storage cavity 10.
[0038] The retraction mechanism 2 includes a fixed shaft 21 and a spring 22; the fixed shaft 21 extends along the first direction X and is fixed in the storage cavity 10, and the spring 22 is wound around the outer periphery of the fixed shaft 21 radially, and one end of the spring 22 is fixedly connected to the fixed shaft 21.
[0039] The safety net assembly 3 includes a safety net fabric 31 and a lifting shaft 32; the lifting shaft 32 is located on the outside of the protective shell 1 and extends along the first direction X; one end of the safety net fabric 31 is connected to the end of the spring 22 away from the fixed shaft 21 and is wound around the fixed shaft 21; the other end of the safety net fabric 31 extends outward through the first opening 101 and is fixedly connected to the lifting shaft 32.
[0040] The locking mechanism 4 includes a moving rod 41, a torsion spring 42, and a stop 43; the moving rod 41 and the stop 43 are rotatably connected, and the torsion spring 42 is sleeved at the connection position between the moving rod 41 and the stop 43, so that the moving rod 41 and the stop 43 are set at a certain angle.
[0041] The protective shell 1 is also provided with a movable groove 102, which is connected to the storage cavity 10. The movable groove 102 has a locked position and an unlocked position. The movable rod 41 passes through the movable groove 102 and can move between the locked position and the unlocked position. The storage cavity 10 is provided with a limiting groove 103.
[0042] When the moving rod 41 is in the locked position, the end of the stop 43 away from the moving rod 41 abuts against the safety net 31; when the moving rod 41 is in the unlocked position, at least part of the moving rod 41 and at least part of the stop 43 are engaged in the limiting groove 103, and the end of the stop 43 away from the moving rod 41 is away from the safety net 31.
[0043] Based on the above technical solution, one end of the safety net 31 is connected to the end of the spring 22 away from the fixed shaft 21 and is wound around the fixed shaft 21, while the other end extends outward through the first opening 101 and is fixedly connected to the lifting shaft 32. This allows the safety net 31 to be wound around the fixed shaft 21 and stored in the storage cavity 10 when not in use. The safety net 31 can be pulled out for use by pulling the lifting shaft 32. After use, when the safety net 31 is pulled out, the spring 22 connected to it is stretched, releasing the fixation on the lifting shaft 32. The spring 22 will then return under elastic force, causing the safety net 31 to retract into the storage cavity 10 and be wound back around the fixed shaft 21 for storage. Thus, by winding the safety net 31, the safety net is stored, avoiding the problems of easy damage and increased maintenance costs caused by folding and storing the safety net. In addition, the safety net device 100 is also provided with a locking mechanism 4. By moving the movable rod 41 between the locked position and the unlocked position, when the movable rod 41 is in the locked position, the end of the stop member 43 away from the movable rod 41 abuts against the safety net 31, thereby stopping the safety net 31 and restricting its movement so that the safety net 31 will not automatically retract and wind up under the action of the spring 22. When the movable rod 41 is in the unlocked position, the end of the stop member 43 away from the movable rod 41 moves away from the safety net 31, and the stop member 43 no longer restricts the safety net 31. When there is no external force to fix the safety net 31, the safety net 31 will automatically retract and wind up under the action of the spring 22. Thus, the locking mechanism 4 achieves the limiting and fixing of the safety net 31, making it convenient for the user to use.
[0044] Furthermore, such as Figures 2-4 As shown, the retraction mechanism 2 also includes a spring box 23; the spring box 23 is sleeved on the outer periphery of the fixed shaft 21 and fixedly connected to the protective shell 1; the spring box 23 has a second opening 230 that penetrates its inner and outer surfaces, and one end of the spring 22 away from the fixed shaft 21 extends outward from the second opening 230 and is connected to the safety net 31.
[0045] It is understandable that, since the spring 22 is located between the fixed shaft 21 and the safety net 31, and the spring 22 is wound radially around the outer periphery of the fixed shaft 21, in order to ensure that the spring 22 has a certain stability and thus avoid the problem that the safety net 31 cannot be retracted under the elastic force of the spring 22 due to its instability under the wrapping action of the safety net 31, a spring box 23 is provided, and the spring box 23 is fitted around the outer periphery of the fixed shaft 21. The spring 22 is located between the inner wall of the spring box 23 and the outer periphery of the fixed shaft 21. The safety net 31 will be wrapped around the outer periphery of the spring box 23, thereby avoiding the safety net 31 from being directly wrapped around the outer periphery of the spring 22, thus ensuring the stability of the spring 22.
[0046] Furthermore, such as Figures 2-4 As shown, the retraction mechanism 2 includes two springs 22; the two springs 22 are respectively located at both ends of the fixed shaft 21 in the first direction X; the spring box 23 has two second openings 230, and the second openings 230 and the springs 22 are arranged in a one-to-one correspondence.
[0047] It is understood that the two springs 22 are respectively located at both ends of the fixed shaft 21 in the first direction X, and each extends out from the two second openings 230 of the spring box 23, thereby connecting to the safety net 31 respectively; thus, the connection reliability and automatic retraction reliability between the safety net 31 and the springs 22 are improved by the two springs 22 spaced apart in the first direction.
[0048] Furthermore, such as Figure 4 As shown, since the safety net 31 has relatively weak rigidity, carbon steel strips 33 are wrapped around both sides of the safety net 31 in the first direction X. The carbon steel strips 33 and the springs 22 are arranged in a one-to-one correspondence, and the end of the spring 22 away from the fixed shaft 21 is connected to the carbon steel strips 33. The carbon steel strips 33 can enhance the overall rigidity so that the extended safety net 31 has sufficient rigidity to effectively retract and wind under the action of the springs 22.
[0049] Furthermore, such as Figure 2 and Figure 3 As shown, in order to facilitate the fixing of the spring 22, the fixing shaft 21 is provided with a fixing groove 210, which extends inward along the axial direction of the fixing shaft 21; the spring 22 is fixedly connected to the fixing shaft 21 through the fixing groove 210.
[0050] Furthermore, in order to enable the locking mechanism 4 to effectively lock the safety net 31, the safety net device 100 includes two locking mechanisms 4; the protective shell 1 has a moving groove 102 on the outer periphery of both ends in the first direction X, and a moving rod 41 passes through the moving groove 102.
[0051] Furthermore, such as Figure 4 As shown, for easy installation of the retractable mechanism 2 inside the protective shell 1, the protective shell 1 includes a shell 11 and a cover 12; the shell 11 is hollow with openings at both ends, and the two ends of the shell 11 are detachably connected to the cover 12 respectively; the spring box 23 is fixedly connected to one of the covers 12.
[0052] Preferably, such as Figure 1 and Figure 4 As shown, multiple connecting nuts 13 are fixed on the inner walls of both ends of the protective shell 1, and the multiple connecting nuts 13 at each end are evenly spaced along the circumference of the protective shell 1; the connecting nuts 13 have connecting holes 130 that penetrate the two surfaces of the first direction X; the cover 12 is detachably connected to the connecting nuts 13 through the connecting holes 130.
[0053] Furthermore, such as Figure 1 As shown, a lifting strap 34 is fixed on the lifting shaft 32 to facilitate the user to pull out the safety net 31.
[0054] The working process of this utility model is as follows: pull the lifting strap 34 to pull the safety net 31 out of the storage cavity 10. At this time, the spring 22 is in a stretched state; move the moving rod 41 from the unlocked position to the locked position so that the stop 43 abuts against the safety net 31, thereby restricting the safety net 31 from retracting under the elastic force of the spring 22.
[0055] When the device needs to be stored after use, the moving rod 41 is moved from the locked position to the unlocked position so that the stop 43 moves away from the safety net 31. The safety net 31 will retract into the storage cavity 10 under the elastic force of the spring 22 and be wound around the outer periphery of the spring box 23.
[0056] In summary, this utility model embodiment provides a safety net device 100, including a protective shell 1, a retraction mechanism 2, a safety net assembly 3, and a locking mechanism 4; since one end of the safety net fabric 31 is connected to the end of the spring 22 away from the fixed shaft 21 and is wound around the fixed shaft 21, and the other end extends outward through the first opening 101 and is fixedly connected to the lifting shaft 32; so that when the safety net fabric 31 is not in use, it is wound around the outer periphery of the fixed shaft 21 and stored in the storage cavity 10. The safety net 31 can be pulled out for use by pulling the lifting shaft 32. After use, when the safety net 31 is pulled out, the spring 22 connected to the safety net 31 is stretched, releasing the fixation of the lifting shaft 32. The spring 22 will return under the action of elastic force, thereby driving the safety net 31 back into the storage cavity 10 and restoring it to the outer periphery of the fixed shaft 21 for storage. In this way, the safety net is stored by winding the safety net 31, thereby avoiding the problems of easy damage and increased manual maintenance costs caused by folding the safety net for storage. In addition, the safety net device 100 is also provided with a locking mechanism 4. By moving the movable rod 41 between the locked position and the unlocked position, when the movable rod 41 is in the locked position, the end of the stop member 43 away from the movable rod 41 abuts against the safety net 31, thereby stopping the safety net 31 and restricting its movement so that the safety net 31 will not automatically retract and wind up under the action of the spring 22. When the movable rod 41 is in the unlocked position, the end of the stop member 43 away from the movable rod 41 moves away from the safety net 31, and the stop member 43 no longer restricts the safety net 31. When there is no external force to fix the safety net 31, the safety net 31 will automatically retract and wind up under the action of the spring 22. Thus, the locking mechanism 4 achieves the limiting and fixing of the safety net 31, making it convenient for the user to use.
[0057] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.
Claims
1. A safety net device, characterized in that, Includes a protective shell, a retractable mechanism, a safety net assembly, and a locking mechanism; The direction in which the protective shell extends is defined as a first direction, and a storage cavity extending along the first direction is provided in the protective shell; a first opening is provided on the outer periphery of the protective shell, and the first opening communicates with the storage cavity; The retraction mechanism includes a fixed shaft and a spring; the fixed shaft extends along a first direction and is fixedly disposed in the receiving cavity, the spring is wound radially around the fixed shaft on the outer periphery of the fixed shaft, and one end of the spring is fixedly connected to the fixed shaft. The safety net assembly includes a safety net fabric and a lifting shaft; the lifting shaft is located on the outside of the protective shell and extends along a first direction; one end of the safety net fabric is connected to the end of the spring away from the fixed shaft and is wound around the fixed shaft; the other end of the safety net fabric extends outward through the first opening and is fixedly connected to the lifting shaft. The locking mechanism includes a moving rod, a torsion spring, and a stop; the moving rod and the stop are rotatably connected, and a torsion spring is sleeved at the connection position between the moving rod and the stop, so that the moving rod and the stop are set at a certain angle. The protective shell is also provided with a movable groove, which communicates with the storage cavity. The movable groove has a locking position and an unlocking position. The movable rod passes through the movable groove and can move between the locking position and the unlocking position. The storage cavity is provided with a limiting groove. When the moving rod is in the locked position, the end of the stop away from the moving rod abuts against the safety net; when the moving rod is in the unlocked position, at least part of the moving rod and at least part of the stop are engaged in the limiting groove, and the end of the stop away from the moving rod is away from the safety net.
2. The safety net device as described in claim 1, characterized in that, The retraction mechanism also includes a spring box; The spring box is sleeved on the outer periphery of the fixed shaft and fixedly connected to the protective shell; The spring box has a second opening that penetrates its inner and outer surfaces. The end of the spring away from the fixed shaft extends out from the second opening and is connected to the safety net.
3. The safety net device as described in claim 2, characterized in that, The retraction mechanism includes two spring-loaded springs; The two spring-loaded springs are respectively disposed at both ends of the fixed shaft in the first direction; The spring box has two second openings, and each second opening corresponds to a mainspring.
4. The safety net device as described in claim 3, characterized in that, The safety net is covered with carbon steel strips on both sides in the first direction; The carbon steel strip and the spring are arranged in a one-to-one correspondence, and the end of the spring away from the fixed shaft is connected to the carbon steel strip.
5. The safety net device as described in claim 1, characterized in that, The fixed shaft has a fixing groove, which extends inward along the axial direction of the fixed shaft. The spring is fixedly connected to the fixed shaft via the fixed groove.
6. The safety net device as described in claim 1, characterized in that, Includes two of the aforementioned locking mechanisms; The protective shell has movable grooves on the outer periphery of both ends in the first direction, and a movable rod passes through the movable groove.
7. The safety net device as described in claim 2, characterized in that, The protective shell includes a shell and a cover; The shell is hollow with openings at both ends, and the two ends of the shell are detachably connected to the cover. The spring box is fixedly connected to one of the covers.
8. The safety net device as described in claim 1, characterized in that, A lifting strap is fixed on the lifting shaft.