Chain safety mechanism

Abstract

The utility model relates to the technical field of lifting platform, concretely is a chain safety mechanism, including the bearing frame, integratedly setting support subassembly, sprocket drive subassembly, trigger subassembly and safety enforcement subassembly on the bearing frame, the sprocket drive subassembly includes the fixed sprocket of rotating connection in the bearing frame upper part, and the movable sprocket of sliding installation in the bearing frame upper part through the first waist hole, and the movable sprocket is engaged transmission with the fixed sprocket through chain group, is equipped with the limiting component on the movable sprocket. The chain safety mechanism, through the linkage mechanism of chain slack, fracture, movable sprocket displacement, limiting piece trigger, dial piece rotation, safety bar locking, the whole process effectively avoids the falling of the object platform, and each component is integrated on the bearing frame, and the layout is reasonable, and the occupied space is small, can directly adapt to the existing lifting slide rail mechanism, need not to transform greatly, adopts mechanical linkage structure, need not power drive, is not influenced by environmental factors.

Description

Technical Field

[0001] This utility model relates to the field of lifting platform technology, specifically a chain safety mechanism. Background Technology

[0002] In industrial fields such as automated production lines, warehousing and logistics equipment, and lifting platforms, lifting slide rail mechanisms are widely used as core transmission components for vertical lifting or horizontal movement of heavy objects. They are applied in scenarios such as material handling, equipment debugging, and cargo storage. These mechanisms typically use chains as the core transmission component, with motors driving the chain meshing transmission to move the loading platform on the slide rail along a preset track to complete the lifting action. Its operational stability directly determines the safety performance and operating efficiency of the entire equipment.

[0003] However, in practical applications, during long-term use, the chain is subjected to alternating loads, wear, corrosion, and fatigue stress accumulation. As a result, the key components such as chain links, pins, and rollers will gradually deteriorate in performance. When the load exceeds the chain's rated load-bearing limit, or when there are manufacturing defects or untimely maintenance, the chain is prone to sudden breakage. At this time, the carrying platform and the load it carries will fall rapidly under the action of gravity, which may not only cause serious damage to the equipment, but also pose a fatal threat to the personal safety of the surrounding operators. Utility Model Content

[0004] To achieve the above objectives, this utility model provides the following technical solution: a chain safety mechanism, comprising a support frame, on which a support component, a sprocket drive component, a trigger component, and a safety actuation component are integrated; the sprocket drive component includes a fixed sprocket rotatably connected to the upper part of the support frame, and a movable sprocket slidably mounted on the upper part of the support frame through a first waist hole, the movable sprocket and the fixed sprocket being driven by a chain assembly, and a limiting component being provided on the movable sprocket; the trigger component includes a left and right paddles rotatably mounted on the support frame and staggered, the end of the limiting component being engaged with the left and right paddles; the safety actuation component includes an elastic element and two safety rods, the safety rods being linked with the corresponding paddles, and the elastic element connecting the two safety rods; when the chain assembly is abnormally loose or broken, causing the movable sprocket to displace along the first waist hole, the limiting component disengages from the paddles, causing the safety rods to be pushed out to both sides under the force of the elastic element.

[0005] Furthermore, the support frame has a partition and a fixing plate in the middle. The partition divides the support frame into an upper layer and a lower layer. One end of the limiting component is fitted through the fixing plate. The lower layer of the support frame has two vertical plates and side plates distributed on both sides of the two vertical plates. The safety rod is fitted through the corresponding vertical plates and side plates.

[0006] Furthermore, the front of the support frame also has a transverse groove, and the two ends of the axle of the movable sprocket are adapted to be installed in the first waist hole. The limiting component includes a mounting plate, which is connected to the axle of the movable sprocket. A connecting rod is fixed at one end of the mounting plate, the connecting rod passes through the fixed plate and the end is fixed with a limiting piece. The limiting piece is located in the transverse groove, and an elastic reset member is sleeved on the outside of the connecting rod. The elastic reset member is located between the mounting plate and the fixed plate.

[0007] Furthermore, the limiting plate is fixed to the plane at the end of the connecting rod by bolts. The limiting plate cooperates with the trigger assembly to limit the movement. The elastic reset component is a first spring.

[0008] Furthermore, a card is installed at one end of the right paddle, and the end of the card and the corresponding end of the left paddle both form a limiting groove that can overlap and fit with the limiting plate. The outer side of the safety bar is linked with the corresponding left and right paddles through a pin.

[0009] Furthermore, the elastic element is a second spring, a disc opposite to the vertical plate is fixed on the outer side of the safety rod, a middle cylinder is fixed between the two vertical plates, a guide tube extending from the support frame is fixed on the outward side of the side plate, the safety rod is located inside the middle cylinder and the guide tube, the second spring is located inside the middle cylinder and its two ends respectively abut against the disc on the corresponding side, the support frame has two sets of horizontal waist holes, the left and right levers each have vertical waist holes opposite to the corresponding horizontal waist holes, and a pin is fixed on the safety rod that passes through the corresponding horizontal waist holes and vertical waist holes.

[0010] Furthermore, the axis of the guide tube is collinear with the axis of the bumper, and the inner diameter of the guide tube is adapted to the outer diameter of the bumper.

[0011] Furthermore, both the left lever and the card have protrusions.

[0012] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0013] This chain safety mechanism effectively prevents the cargo platform from falling through a series of interconnected mechanisms, including chain slackness, breakage, displacement of the movable sprocket, triggering of the limit plate, rotation of the lever, and locking of the safety bar. All components are integrated on the support frame, with a reasonable layout and small footprint. It can be directly adapted to existing lifting slide rail mechanisms without major modifications. It adopts a mechanical linkage structure, requires no electric drive, and is unaffected by environmental factors. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a three-dimensional structural diagram of the rear cross-section of this utility model;

[0016] Figure 3 This is a three-dimensional schematic diagram of the mounting plate connection structure in this utility model;

[0017] Figure 4 This utility model Figure 1 A 3D schematic diagram with the left and right paddles removed.

[0018] In the diagram: 1. Support frame; 2. Partition plate; 3. Fixed sprocket; 4. First waist hole; 5. Movable sprocket; 6. Mounting plate; 7. Connecting rod; 8. Fixed plate; 9. First spring; 10. Horizontal groove; 11. Limiting plate; 12. Safety bar; 121. Guide cylinder; 122. Middle cylinder; 123. Pin; 13. Horizontal waist hole; 14. Second spring; 15. Right lever; 16. Card; 17. Limiting groove; 18. Vertical waist hole; 19. Left lever; 20. Chain assembly; 21. Vertical plate; 211. Side plate. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-4 A chain safety mechanism in this embodiment includes a support frame 1. The support frame 1 integrates a support component, a sprocket drive component, a trigger component, and a safety execution component. The sprocket drive component is equipped with a limit component. All components work together to achieve rapid locking protection when the chain is abnormal.

[0021] like Figure 2 The support components include a partition 2 fixed inside the support frame 1, which divides the inner side of the support frame 1 into an upper and lower layer, enabling layered installation of components, avoiding motion interference, and improving the rationality of the structural layout; a fixing plate 8 fixed above the partition 2; two vertical plates 21 fixed to the lower inner side of the support frame 1; and side plates 211 distributed on both sides of the vertical plates 21. The fixing plate 8 provides sliding support for the limiting components, and the vertical plates 211 and side plates 211 provide a through-mounting foundation for the safety bar 12, ensuring the installation stability of each transmission component and improving motion accuracy. The support frame 1 is concave, which naturally divides the upper and lower installation spaces, providing an integrated installation foundation for each component, while reducing the overall volume and facilitating compatibility with existing equipment.

[0022] The sprocket drive assembly includes a fixed sprocket 3 rotatably connected to the back of the support frame 1, and a movable sprocket 5 mounted on the back of the support frame 1 via a sliding structure. The movable sprocket 5 and the fixed sprocket 3 are driven by a chain assembly 20. The support frame 1 has a first waist hole 4 on both the front and rear sides and a set of transverse grooves 10 on the front, both at the same height. The two ends of the axle of the movable sprocket 5 are fitted into the first waist hole 4. The movable sprocket 5 moves flexibly along the first waist hole 4, providing precise guidance for the displacement linkage of the movable sprocket 5, ensuring a stable motion trajectory, and providing a prerequisite for triggering action when the chain is abnormal. The movable sprocket 5 is provided with a limiting component, which is fitted through and cooperates with the fixed plate 8 and is linked with the triggering component.

[0023] like Figure 3 The limiting component includes a mounting plate 6 installed on the axle of the movable sprocket 5. A connecting rod 7 is fixed on the mounting plate 6 and slides with the fixed plate 8 to realize the synchronous movement of the movable sprocket 5 and the limiting component, ensuring accurate transmission of the trigger signal. A first spring 9 is sleeved on the outside of the connecting rod 7 and is located between the mounting plate 6 and the fixed plate 8 to provide a reset spring force for the movable sprocket 5. When the chain is normal, it maintains its stable position and assists its rapid displacement when the chain is abnormal. The connecting rod 7 is stepped, and a limiting piece 11 passing through the transverse groove 10 is fixed to the flat surface of the other end by bolts. Through the cooperation of the limiting piece 11 and the trigger component, the precise triggering of the chain state is realized.

[0024] like Figure 1-2 The triggering component includes a left lever 19 and a right lever 15 that are hinged to the front of the support frame 1 and are staggered. A card 16 is installed on the left end of the right lever 15. The left end of the card 16 and the corresponding end of the left lever 19 both form a limiting groove 17 that can be staggered and overlapped and adapted to the limiting plate 11. A protrusion is formed on both the left lever 19 and the card 16. The protrusion facilitates manual movement of the lever. The outer side of the safety lever 12 is linked with the corresponding left lever 19 and right lever 15 through a pin 123 to realize the efficient transmission of the triggering action to the safety actuator and ensure rapid linkage response.

[0025] The safety actuator includes a second spring 14 and two safety rods 12. The safety rods 12 are fitted through and cooperate with the vertical plate 21 and the side plate 211. A disc opposite to the vertical plate 21 is fixed on the outer side of the safety rod 12. A middle cylinder 122 is fixed between the two vertical plates 21. A guide cylinder 121 extending from the support frame 1 is fixed on the outward side of the side plate 211. The axis of the guide cylinder 121 is collinear with the axis of the safety rod 12 and the inner diameter is adapted to the outer diameter of the safety rod 12, providing precise guidance for the extension and retraction of the safety rod 12 and avoiding jamming. The safety rod 12 is located inside the middle cylinder 122 and the guide cylinder 121, and the second spring 14 located in the middle cylinder 122 is sleeved between the safety rods 12. The two ends of the second spring 14 respectively abut against the corresponding discs. The middle cylinder is used to prevent the second spring from jamming.

[0026] In addition, the front of the support frame 1 has two sets of horizontal waist holes 13 on the same line. The left lever 19 and the right lever 15 each have vertical waist holes 18 that are opposite to the corresponding horizontal waist holes 13. The pin on the safety bar 12 passes through the corresponding horizontal waist holes 13 and vertical waist holes 18. By sliding the pin in the waist holes, the precise linkage between the rotation of the lever and the extension and retraction of the safety bar 12 can be achieved.

[0027] As described above, when the chain assembly 20 becomes abnormally loose or breaks, causing the movable sprocket 5 to shift, the movable sprocket 5 drives the mounting plate 6 and connecting rod 7 to move synchronously, thereby pushing the limiting plate 11 out of the constraint of the limiting groove 17, triggering the left lever 19 and right lever 15 to rotate. At the same time, the second spring releases its elastic force outward, driving the safety bar 12 to push out to both sides and into the slide rails on both sides. The inner side of the slide rail has rod holes or stops along the height direction. The safety bar 12 is locked in the rod holes or stops, realizing the locking protection of the loading platform. Here, during the movement of the safety bar to both sides, the pin on it moves along the horizontal waist hole 13 to the outermost position. As the pin moves, it also drives the levers to rotate.

[0028] The working principle of the above embodiments is as follows:

[0029] Under normal chain drive conditions, the fixed sprocket maintains a fixed rotation, while the movable sprocket is in a stable position under the action of the limiting component. At this time, the mounting plate remains fixed within the first waist hole along with the movable sprocket axle. The first spring on the outside of the connecting rod is in a balanced compression state. The limiting piece at the end of the stepped connecting rod passes through the transverse groove and engages in the staggered limiting groove formed by the left derailleur and the card. Simultaneously, in the safety actuator, the safety lever, under the constraint of the pin shaft and the vertical waist holes of the left and right derailleurs and the transverse waist hole of the support frame, overcomes the elastic force of the second spring and remains in a contracted state. The second spring is restricted between the safety lever disc and the middle cylinder, while the guide cylinder provides pre-positioning guidance for the safety lever. When the chain assembly becomes abnormally loose or breaks, its... When the constraint force of the movable sprocket disappears, the restoring force of the first spring pushes the mounting plate to drive the movable sprocket to move rapidly along the first waist hole. Simultaneously, it drives the connecting rod and the limiting plate to move along the horizontal groove, causing the limiting plate to break free from the constraint of the left lever and the card limiting groove. After the trigger component loses its limit, the left and right levers rotate freely around the hinge point, causing the pin on the safety bar to slide along the horizontal and vertical waist holes, releasing the constraint on the safety bar. In the safety execution component, the second spring releases its force to push the safety bar to extend rapidly along the mounting holes of the vertical plate and side plate and the guide cylinder, and finally pushes into the external slide rail, realizing the rapid locking and protection of the loading platform. The entire process is completed through the precise linkage of each component, achieving an efficient response from chain abnormality detection to locking execution.

[0030] The entire workflow is now complete, and anything not described in detail in this specification is existing technology known to those skilled in the art.

[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 a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0032] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A chain insurance mechanism, characterized in that, Includes a support frame (1), on which a support assembly, a sprocket drive assembly, a trigger assembly, and a safety actuation assembly are integrated; The sprocket drive assembly includes a fixed sprocket (3) rotatably connected to the upper part of the support frame (1), and a movable sprocket (5) slidably mounted on the upper part of the support frame (1) through the first waist hole (4). The movable sprocket (5) and the fixed sprocket (3) are driven by the meshing of the chain group (20). The movable sprocket (5) is provided with a limiting component. The triggering component includes a left paddle (19) and a right paddle (15) that are rotatably mounted on the support frame (1) and are staggered, and the end of the limiting component is engaged with the left and right paddles; The safety actuator includes an elastic element and two safety rods (12). The safety rods (12) are linked with the corresponding paddles. The elastic element connects the two safety rods (12). When the chain assembly (20) is abnormally loose or broken, causing the movable sprocket (5) to move along the first waist hole (4), the limiting component disengages from the paddle, so that the safety rods (12) are pushed out to both sides under the force of the elastic element.

2. The chain insurance mechanism according to claim 1, characterized in that: The support frame (1) has a partition (2) and a fixing plate (8) in the middle. The partition (2) divides the support frame (1) into an upper layer and a lower layer. One end of the limiting component is fitted with the fixing plate (8). The lower layer of the support frame (1) has two vertical plates (21) and side plates (211) distributed on both sides of the two vertical plates (21). The safety rod (12) is fitted with the corresponding vertical plate (21) and side plate (211).

3. A chain insurance mechanism according to claim 2, characterized in that: The front of the support frame (1) also has a transverse groove (10). The two ends of the axle of the movable sprocket (5) are adapted to be installed in the first waist hole (4). The limiting component includes a mounting plate (6). The mounting plate (6) is connected to the axle of the movable sprocket (5). A connecting rod (7) is fixed at one end of the mounting plate (6). The connecting rod (7) passes through the fixing plate (8) and the end is fixed with a limiting piece (11). The limiting piece (11) is located in the transverse groove (10). An elastic reset member is sleeved on the outside of the connecting rod (7). The elastic reset member is located between the mounting plate (6) and the fixing plate (8).

4. A chain insurance mechanism according to claim 3, characterized in that: The limiting piece (11) is fixed to the plane at the end of the connecting rod (7) by bolts. The limiting piece (11) cooperates with the trigger assembly to limit the movement. The elastic reset component is the first spring (9).

5. A chain insurance mechanism according to claim 2, characterized in that: One end of the right paddle (15) is fitted with a card (16). The end of the card (16) and the corresponding end of the left paddle (19) are both formed with a limiting groove (17) that can be overlapped and adapted to the limiting piece (11). The outer side of the safety bar (12) is linked with the corresponding left paddle (19) and right paddle (15) through a pin (123).

6. A chain insurance mechanism according to claim 5, characterized in that: The elastic element is a second spring (14). A disc opposite to the vertical plate (21) is fixed on the outside of the safety rod (12). A middle cylinder (122) is fixed between the two vertical plates (21). A guide cylinder (121) extending out of the support frame (1) is fixed on the side of the side plate (211). The safety rod (12) is located inside the middle cylinder (122) and the guide cylinder (121). The second spring (14) is located inside the middle cylinder (122) and its two ends abut against the disc on the corresponding side. The support frame (1) has two sets of horizontal waist holes (13). The left lever (19) and the right lever (15) both have vertical waist holes (18) opposite to the corresponding horizontal waist holes (13). A pin (123) passing through the corresponding horizontal waist holes (13) and vertical waist holes (18) is fixed on the safety rod (12).

7. A chain insurance mechanism according to claim 6, characterized in that: The axis of the guide tube (121) is collinear with the axis of the bumper (12), and the inner diameter of the guide tube (121) is adapted to the outer diameter of the bumper (12).

8. A chain insurance mechanism according to claim 5, characterized in that: Both the left lever (19) and the card (16) have raised plates.

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