A fall protection device

Abstract

This application provides a fall protection device, relating to the field of elevator safety protection equipment. It includes a chain, a pull rod located on the lower side of the chain, and sequentially arranged along the chain's lifting direction: a first spring, a first connecting arm, a deep groove ball bearing, a support plate, a bearing seat, a second connecting arm, a guide rod, a second spring, a mounting base, and a locking plate. The lower part of the pull rod is hinged to one end of the first connecting arm, and the other end of the first connecting arm is fixedly connected to the deep groove ball bearing. The support plate is horizontally positioned below the deep groove ball bearing, with the deep groove ball bearing abutting against the upper surface of the support plate. In this fall protection device, if the chain breaks, the spring instantly rebounds, causing the pull rod to move downwards under spring tension, which in turn causes the connecting arm to swing back. The deep groove ball bearing moves upwards, and the spring rebounds, causing the bearing seat to move upwards outside the guide rod. This, in turn, causes the second connecting arm to retract upwards via the support plate, thereby causing the locking plate to move upwards to ensure locking.

Description

Technical Field

[0001] This application relates to the field of elevator safety protection equipment technology, specifically a fall protection device. Background Technology

[0002] In the field of elevator safety protection equipment, the safety protection of elevator cars is achieved through the coordinated operation of mechanical structures. The core function is to ensure smooth lifting and lowering during normal elevator operation, and to quickly trigger the locking mechanism to prevent the car from falling in the event of accidents such as chain breakage.

[0003] With the deepening of industrialization, the requirements for automation, variety, and high efficiency are increasing daily, and the requirements for safe production have been repeatedly mentioned. Traditional safety ropes have limited applicability and cannot be reused, speed difference controllers have slow response speeds, buffer packs lack sufficient effectiveness and reliability, and safety belt connectors cannot be locked a second time. In summary, new fall protection devices have been developed; therefore, a fall protection device is proposed. Utility Model Content

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this application provides a fall protection device that solves the problems mentioned in the background section.

[0005] (II) Technical Solution To achieve the above objectives, this application provides the following technical solution: a fall protection device comprising a chain, a pull rod disposed on the lower side of the chain, and a first spring, a first connecting arm, a deep groove ball bearing, a support plate, a bearing seat, a second connecting arm, a guide rod, a second spring, a mounting base, and a locking plate arranged sequentially along the lifting direction of the chain; the lower part of the pull rod is hinged to one end of the first connecting arm, and the other end of the first connecting arm is fixedly connected to the deep groove ball bearing; the support plate is horizontally disposed below the deep groove ball bearing, and the deep groove ball bearing abuts against the upper surface of the support plate; the bearing seat is fixed to one side of the support plate, the guide rod is fixedly connected to the upper side of the mounting base, two second connecting arms are provided and symmetrically distributed on both sides of the guide rod, the upper end of the second connecting arms is fixedly connected to the support plate, and two locking plates are provided and respectively hinged to the lower ends of the two second connecting arms.

[0006] By adopting the above technical solution, when the car is moving normally, the chain pulls the rod upward, the spring contracts and drives the first connecting arm to swing upward, the deep groove ball bearing presses the support plate downward, causing the bearing seat to move downward along the guide rod, which in turn drives the second connecting arm to expand to both sides. The second connecting arm presses the second spring and drives the locking plate to open to both sides, realizing unobstructed lifting and lowering of the car. The guide rod is fixedly connected to the mounting base, keeping the guide rod fixed and facilitating the stable sliding of the subsequent support plate.

[0007] Preferably, the pull rod drives the first connecting arm to swing downwards, and the second spring rebounds to push the bearing seat to move upwards outside the guide rod.

[0008] By adopting the above technical solution, the bearing seat drives the second connecting arm to retract inward through the support plate, thereby driving the two locking plates to move closer to each other and clamp the lifting rail, thus realizing the emergency locking of the car.

[0009] Preferably, the chain is laid out along the lifting direction of the car, and the laying direction of the chain is consistent with the movement trajectory of the car.

[0010] By adopting the above technical solution, the upper end of the chain is fixedly connected to the traction device on the top of the car; this enables the chain to effectively transmit the pulling force of the car's movement, providing a power transmission basis for the normal operation of the device.

[0011] Preferably, the first spring is sleeved on the outside of the pull rod, and the lower two ends of the first spring abut against the concave edge in the middle of the pull rod.

[0012] By adopting the above technical solution, the first spring is sleeved on the outside of the pull rod, which saves space and facilitates the transmission of force. Its lower end is connected to the flange of the pull rod, which ensures that the first spring can contract stably during normal operation and can rebound reliably in case of an accident. It is a key elastic component for the device to realize state switching.

[0013] Preferably, one end of the first connecting arm is hinged to the pull rod via a pin structure, while the other end of the first connecting arm is fixedly connected to the deep groove ball bearing via an interference fit.

[0014] By adopting the above technical solution, one end of each first connecting arm is hinged to the hinge lug at the bottom of the pull rod via the first hinge shaft, and the other end is fixedly connected to the outer ring sidewall of the deep groove ball bearing via the second hinge shaft. The two symmetrically distributed first connecting arms can make the force transmission more balanced. The connection method of the first and second hinge shafts ensures the flexible swing of the first connecting arm under the action of the pull rod, thereby effectively transmitting the force to the deep groove ball bearing.

[0015] Preferably, the bearing seat has a block structure, the second spring is sleeved on the outside of the guide rod, and the bearing seat is disposed on the outside of the guide rod and slidably connected to the guide rod.

[0016] By adopting the above technical solution, the block-structured bearing housing provides stable support, the bolt connection ensures the firmness of the connection between the support plate and the bearing housing, and the bearing housing slides straight up and down outside the guide rod.

[0017] Preferably, one end of the second spring abuts against the bearing seat, and the second connecting arm is arranged at an angle.

[0018] By adopting the above technical solution, the second spring facilitates the direct application of force, can be effectively compressed during normal operation, and can quickly rebound to provide power in emergency situations, ensuring the timeliness and reliability of the action of the second connecting arm and locking plate.

[0019] (III) Beneficial Effects This application provides a fall protection device. It has the following beneficial effects: 1. In this type of fall protection device, if the chain breaks unexpectedly, the spring will rebound instantly, the lever will move downward under the spring tension, causing the connecting arm to swing back, the deep groove ball bearing to move upward, and the spring will rebound, thereby causing the bearing seat to move upward outside the guide rod. This will cause the second connecting arm to retract upward through the support plate, thereby causing the locking plate to move upward to ensure locking. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a three-dimensional structural diagram of the entire application from the front view; Figure 2 For the purposes of this application Figure 1 A schematic diagram of the frontal 3D structure of part A before triggering; Figure 3 For the purposes of this application Figure 1 A schematic diagram of the front and rear view stereo structure triggered by part A; Figure 4 For the purposes of this application Figure 1 A schematic diagram of the three-dimensional structure after triggering part A.

[0022] In the diagram: 1. Chain; 2. Pull rod; 3. First spring; 4. First connecting arm; 5. Deep groove ball bearing; 6. Support plate; 7. Bearing seat; 8. Second connecting arm; 9. Guide rod; 10. Second spring; 11. Mounting seat; 12. Locking plate. Detailed Implementation

[0023] The present application will be further described in detail below with reference to the accompanying drawings and embodiments.

[0024] Reference Figures 1 to 4This application provides a fall protection device, including a chain 1, a pull rod 2 on the lower side of the chain 1, and a first spring 3, a first connecting arm 4, a deep groove ball bearing 5, a support plate 6, a bearing seat 7, a second connecting arm 8, a guide rod 9, a second spring 10, a mounting base 11, and a locking plate 12 arranged sequentially along the lifting direction of the chain. The lower part of the pull rod 2 is hinged to one end of the first connecting arm 4, and the other end of the first connecting arm 4 is fixedly connected to the deep groove ball bearing 5. The support plate 6 is horizontally arranged below the deep groove ball bearing 5, and the deep groove ball bearing 5 abuts against the upper surface of the support plate 6. The bearing seat 7 is fixed to one side of the support plate 6, the guide rod 9 is fixedly connected to the upper side of the mounting base 11, two second connecting arms 8 are provided and symmetrically distributed on both sides of the guide rod 9, the upper end of the second connecting arm 8 is fixedly connected to the support plate 6, and two locking plates 12 are provided and respectively hinged to the lower ends of the two second connecting arms 8. One end of the first spring 3 is connected to the lower end of the first connecting arm 8. The pull rod 2 is fixedly connected, and it drives the first connecting arm 4 to swing downwards. The deep groove ball bearing 5 detaches upwards from the support plate 6, and the second spring 10 rebounds, pushing the bearing seat 7 upwards along the guide rod 9. The guide rod 9 is fixedly connected to the mounting base 11, keeping the guide rod 9 stationary and facilitating the stable sliding of the support plate 6. The chain 1 is laid out along the car's lifting direction, and this laying direction is consistent with the car's movement trajectory. The chain 1 ensures stable power transmission and reduces wear. The hinge structure of the pull rod 2 makes force transmission more flexible. The symmetrical distribution of the second connecting arm 8 achieves balanced force transmission. The deep groove ball bearing 5 reduces resistance and wear through rolling friction. The support plate 6 ensures that the vertical transmission of force is not dispersed. The lever structure of the second connecting arm 8 amplifies the driving force. The guide rod 9 ensures the straightness of the bearing seat 7's movement. The first spring 3 enables rapid emergency response and buffers impact. The symmetrical arrangement of the locking plate 12 improves locking reliability. These components work together to ensure the smooth normal lifting of the car and to achieve efficient locking in case of accidents, comprehensively improving the safety and stability of the device.

[0025] Reference Figure 2 and Figure 4 In one aspect of this embodiment, the design of the first spring 3 being sleeved on the outside of the pull rod 2 and limited by the flange has significant advantages. The sleeved structure ensures that the direction of the spring force is consistent with the direction of movement of the pull rod 2, effectively preventing spring torsion failure; the flange precisely controls the spring's extension and contraction range, preventing elastic fatigue caused by excessive stretching or compression, greatly extending the service life of the first spring 3, ensuring that it can stably contract and store energy during normal operation, and reliably rebound to provide power in case of accidents.

[0026] Reference Figure 2 and Figure 4In one aspect of this embodiment, the second connecting arm 8 adopts a design with two symmetrically distributed and double-hinged arms, which has significant advantages. The symmetrical distribution balances the tension transmitted by the pull rod 2 and avoids the component from tilting due to unilateral force. The double-hinged structure increases the degree of freedom of movement and can flexibly adapt to the angle changes between the pull rod 2 and the deep groove ball bearing 5, reduce mechanical jamming, ensure the smooth transmission of force between the two, and improve the reliability of the overall linkage of the device.

[0027] Reference Figure 2 and Figure 4 In one aspect of this embodiment, the block structure of the bearing housing 7 is fixed to the support plate 6 by bolt connection; the block structure enhances the overall rigidity, and the bolt connection ensures that the connection with the support plate 6 is firm and does not loosen; it ensures the accuracy of the movement of the bearing housing 7 and provides a guarantee for the accuracy of the subsequent locking action.

[0028] Reference Figure 2 , Figure 3 and Figure 4 In one aspect of this embodiment, the pre-compression state of the second spring 10 allows the second spring 10 to stably store energy during normal operation and to quickly rebound to provide sufficient driving force in case of an accident; this ensures the reliability of the second spring 10's operation and ensures that the second connecting arm 8 can be pushed to retract and achieve effective locking in an emergency.

[0029] All electrical devices in this plan are powered by an external power source.

[0030] Working principle: This fall protection device works as follows: When the car is moving normally, the chain 1 pulls the lever 2 upward, the first spring 3 contracts and drives the first connecting arm 4 to swing upward, the deep groove ball bearing 5 presses down on the support plate 6, and the bearing seat 7 moves downward under the limit of the guide rod 9, which in turn drives the second connecting arm 8 to expand to both sides. The second connecting arm 8 presses the second spring 10 and drives the locking plate 12 to open to both sides, realizing unobstructed lifting of the car. When the chain 1 breaks unexpectedly, the first spring 3 rebounds instantly and pulls the lever 2 downward. The lever 2 drives the first connecting arm 4 to swing downward, the deep groove ball bearing 5 disengages upward from the support plate 6, and the second spring 10 rebounds and pushes the bearing seat 7 upward along the direction limited by the guide rod 9, which causes the support plate 6 to drive the second connecting arm 8 to contract inward, which in turn drives the two locking plates 12 to move closer to each other and clamp the lifting rail, realizing emergency locking of the car.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fall protection device, comprising a chain (1), characterized in that: A pull rod (2) is provided on the lower side of the chain (1), and a first spring (3), a first connecting arm (4), a deep groove ball bearing (5), a support plate (6), a bearing seat (7), a second connecting arm (8), a guide rod (9), a second spring (10), a mounting seat (11), and a locking plate (12) are arranged sequentially along the lifting direction of the chain (1); the lower part of the pull rod (2) is hinged to one end of the first connecting arm (4), and the other end of the first connecting arm (4) is fixedly connected to the deep groove ball bearing (5); the support plate ( 6) The deep groove ball bearing (5) is horizontally positioned below the deep groove ball bearing (5), and the deep groove ball bearing (5) abuts against the upper surface of the support plate (6); the bearing seat (7) is fixed on one side of the support plate (6), the guide rod (9) is fixedly connected to the upper side of the mounting base (11), the second connecting arm (8) is provided in two and symmetrically distributed on both sides of the guide rod (9), the upper end of the second connecting arm (8) is fixedly connected to the support plate (6), and the locking plate (12) is provided in two and is respectively hinged to the lower end of the two second connecting arms (8).

2. The fall protection device according to claim 1, characterized in that: The pull rod (2) drives the first connecting arm (4) to swing downwards, and the second spring (10) rebounds and pushes the bearing seat (7) to move upwards outside the guide rod (9).

3. The fall protection device according to claim 1, characterized in that: The chain (1) is laid out along the direction of the car's lifting and lowering, and the laying direction of the chain (1) is consistent with the movement trajectory of the car.

4. The fall protection device according to claim 1, characterized in that: The first spring (3) is sleeved on the outside of the pull rod (2), and the lower ends of the first spring (3) abut against the concave edge in the middle of the pull rod (2).

5. A fall protection device according to claim 1, characterized in that: One end of the first connecting arm (4) is hinged to the pull rod (2) through a pin structure, and the other end of the first connecting arm (4) is fixedly connected to the deep groove ball bearing (5) by an interference fit.

6. A fall protection device according to claim 1, characterized in that: The bearing seat (7) has a block structure, the second spring (10) is sleeved on the outside of the guide rod (9), and the bearing seat (7) is disposed on the outside of the guide rod (9) and slidably connected to the guide rod (9).

7. A fall protection device according to claim 1, characterized in that: One end of the second spring (10) abuts against the bearing seat (7), and the second connecting arm (8) is set at an angle.

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