Anti-falling sling

Abstract

The utility model discloses a kind of anti-drop lifting appliances, solve the problem that existing lifting appliance swing lever is easy to cause part to fall off due to touching synchronous inner shrinkage. It includes boom, three-prong type upper frame, upper frame fixed connection riser and stop lever, and anti-drop pressing plate and spring are equipped on the boom;Anti-drop pressing plate contains ring plate, riser outside short plate and long plate, short plate abuts stop lever, spring abuts pressing plate and upper frame. When there is no external force, spring makes pressing plate and stop lever clamping locking, limit boom and upper frame sliding, prevent swing lever to shrink;Unlock by pressing long plate, convenient to assemble and disassemble. It improves lifting safety, convenient to operate, reliable in construction, and is suitable for large parts hoisting.

Description

Technical Field

[0001] This utility model relates to the field of mechanical processing technology, specifically an anti-detachment lifting device. Background Technology

[0002] In the field of machining, especially for large parts such as large gears, bearing housings, and cylinder blocks—workpieces with internal bore structures—lifting operations are an indispensable and crucial link in the production process. These parts are typically characterized by their large weight, high precision requirements, and susceptibility to surface damage, thus placing extremely high demands on the stability, safety, and ease of operation of lifting equipment.

[0003] Currently, the lifting tools widely used in the industry include Figure 1 As shown, its core structure includes: a lifting rod 1 with a lifting ring 2 fixed to its upper end, the lifting ring 2 being used to connect lifting equipment such as cranes; a three-pronged lower frame 3 fixedly installed at the lower end of the lifting rod 1; a three-pronged upper frame 4 assembled in the middle of the lifting rod 1 through a sliding fit; the inner ends of three connecting rods 5 being hinged to the three ends of the three-pronged lower frame 3 respectively; and the upper ends of three swing rods 6 with hooks at their lower ends being hinged to the three ends of the three-pronged upper frame 4 respectively, with the outer end of each connecting rod 5 correspondingly hinged to the swing rod 6 near the upper end.

[0004] The standard operating procedure for this lifting device is as follows: Before lifting, the operator manually retracts the lower end of the swing arm 6 inward, allowing the hook to smoothly enter the inner hole of the large part; after the hook at the lower end of the swing arm 6 fully contacts the lower surface of the part, the lifting equipment pulls the lifting device upward through the lifting ring 2; during this process, the three-pronged upper frame 4 slides upward along the lifting rod 1, and through the transmission action of the connecting rod 5, it drives the swing arm 6 to rotate around the hinge point with the upper frame, so that the lower end of the swing arm 6 expands outward synchronously and tightly abuts against the inner hole wall of the part, thereby achieving the clamping and lifting of the part.

[0005] However, this traditional lifting device presents significant safety hazards in practical applications: Because the three-pronged upper frame 4, three-pronged lower frame 3, and three swing arms 6 form a rigid linkage structure via connecting rods 5, if the outer surface of any swing arm 6 accidentally contacts a protruding structure of the processing equipment, such as a machine tool guide rail, tooling fixture protrusion, or workshop column, during lifting, that swing arm 6 will experience an inward thrust. This thrust is transmitted to the entire system through the linkage mechanism, causing the lower ends of all three swing arms 6 to retract inward synchronously. This synchronous inward retraction directly causes the hook to fail to contact the lower surface of the part, resulting in anything from minor part swaying and shifting to serious accidents such as the part falling off the lifting device. Utility Model Content

[0006] To address the problem of insufficient lifting safety caused by the rigid linkage structure of existing lifting devices, which makes the swing arm susceptible to collision and synchronous retraction, this utility model provides an anti-detachment lifting device. While retaining traditional lifting functions, this device optimizes its structural design by adding an anti-detachment locking mechanism. This effectively limits the accidental retraction of the swing arm and improves the clamping stability for parts with different inner hole sizes, thereby eliminating the safety hazard of parts falling off during lifting. The technical solution adopted is as follows:

[0007] An anti-detachment lifting device includes a lifting rod and a three-pronged upper frame that slides with the lifting rod. Unlike existing technologies, the upper surface of the three-pronged upper frame is fixedly connected to a vertical plate, and a stop bar is fixedly connected to the upper end near the vertical plate. An anti-detachment pressure plate and a spring are disposed on the lifting rod located above the three-pronged upper frame. The anti-detachment pressure plate includes an annular plate that is sleeved on the outside of the lifting rod and has a clearance fit with the lifting rod. The annular plate extends toward the vertical plate to form two short plates located outside the vertical plate and extends away from the vertical plate to form one long plate. The upper surfaces of the two short plates abut against the stop bar. The spring is sleeved on the outside of the lifting rod and its two ends abut against the anti-detachment pressure plate and the three-pronged upper frame, respectively.

[0008] Furthermore, the hardness of the anti-detachment pressure plate is greater than that of the suspension rod.

[0009] Furthermore, when no external force is applied, the elastic force of the spring, combined with the limiting position of the stop bar, causes the anti-detachment pressure plate to tilt. The inner hole of the anti-detachment pressure plate abuts against the stop bar to form a locking engagement, restricting the sliding of the boom relative to the three-pronged upper frame. When the end of the long plate is pressed down, the locking engagement is released, and the boom can slide freely relative to the three-pronged upper frame.

[0010] Furthermore, the centerline of the vertical plate in the width direction is arranged radially along the suspension rod.

[0011] Furthermore, the stop bar is a round bar, and its axial direction is tangent to the concentric circle of the lifting rod.

[0012] Furthermore, the distance between the two short plates is greater than or equal to the thickness of the upright plate.

[0013] Furthermore, the inner diameter of the ring plate is 1-3 mm larger than the outer diameter of the suspension rod.

[0014] Furthermore, the length of the long plate is more than 5 times the length of the short plate. The long plate serves as the release control end, used to overcome the spring force through a downward pressing operation, causing the ring plate to drive the short plate to disengage from the stop lever.

[0015] Furthermore, the stop bar is fixed to the upright plate, and the upright plate is fixed to the three-pronged upper frame by welding.

[0016] Furthermore, the free end of the long plate is provided with anti-slip texture or covered with a rubber sleeve.

[0017] The beneficial technical effects of this utility model are as follows:

[0018] 1. Significantly improved safety against detachment: The spring force, in conjunction with the stop bar and anti-detachment pressure plate, forms a reliable locking mechanism that effectively limits the relative sliding between the boom and the three-pronged upper frame when no external force is applied. This prevents synchronous inward retraction caused by accidental contact of the swing arm, mechanically eliminating the risk of parts falling off during the lifting process and greatly improving operational safety.

[0019] 2. Convenient and labor-saving operation: The long plate serves as the release control end, and its length is designed to be more than 5 times that of the short plate, forming a leverage effect. The operator only needs to apply a small amount of downward pressure to overcome the spring force and release the lock, allowing the boom and the three-pronged upper frame to slide freely again, meeting the needs of quick loading and unloading of parts in hoisting operations and reducing the intensity of operation.

[0020] 3. Stable and reliable structure: The welding and fixing method of the upright plate, the stop bar and the three-pronged upper frame, combined with the one-piece molding design of the anti-detachment pressure plate, ensures the structural strength of the locking mechanism; the clearance fit and material hardness matching between the ring plate and the lifting rod not only ensures the flexibility of relative movement, but also reduces wear and tear during long-term use and extends the service life of the lifting equipment.

[0021] 4. High adaptability: Through the adaptive design of the short plate spacing and the thickness of the vertical plate, and the optimization of the gap between the inner diameter of the ring plate and the outer diameter of the lifting rod, the lifting device can meet the lifting needs of large parts with different inner hole sizes while achieving the anti-detachment function. There is no need to make structural adjustments for specific parts, which improves the versatility of the equipment. Attached Figure Description

[0022] Figure 1 This is a structural diagram of an existing lifting device.

[0023] Figure 2 This is a schematic diagram of the structure of this utility model.

[0024] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle. Detailed Implementation

[0025] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "communication" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] like Figure 2-3 The illustrated anti-detachment lifting device includes a lifting rod 1 with a lifting ring 2 fixed to its upper end, the lifting ring 2 being used to connect to lifting equipment such as cranes; a three-pronged lower frame 3 is fixedly installed at the lower end of the lifting rod 1; a three-pronged upper frame 4 is mounted in the middle of the lifting rod 1 via a sliding fit; the inner ends of three connecting rods 5 are respectively hinged to the three ends of the three-pronged lower frame 3; the upper ends of three swing rods 6 with hooks at their lower ends are respectively hinged to the three ends of the three-pronged upper frame 4, and the outer end of each connecting rod 5 is correspondingly hinged to the swing rod 6 near the upper end; a vertical plate 7 is fixedly connected to the upper surface of the three-pronged upper frame 4, near the vertical plate 7. The upper end is fixed to the stop bar 8; the hanger 1 located above the triangular frame 4 is equipped with an anti-detachment pressure plate 9 and a spring 10. The anti-detachment pressure plate 9 includes a ring plate 91 that is sleeved on the hanger 1 and has a clearance fit with the hanger 1. The ring plate 91 extends toward the vertical plate 7 to form two short plates 92 located outside the vertical plate 7 and extends away from the vertical plate 7 to form a long plate 93. The upper surfaces of the two short plates 92 abut against the stop bar 8. The spring 10 is sleeved on the hanger 1 and its two ends abut against the anti-detachment pressure plate 9 and the triangular frame 4, respectively.

[0029] During lifting and hoisting, the anti-detachment mechanism achieves its anti-detachment function by switching between "locked" and "unlocked" states:

[0030] Locked State / Anti-Loss Activation: When no external force is applied, spring 10 is in its naturally extended state. Its elastic force pushes the anti-loosening pressure plate 9 upward, causing the ring plate 91 to lift the short plates 92. The upper surfaces of the two short plates 92 tightly abut against the stop bar 8. Due to the gap between the ring plate 91 and the hanger 1, the anti-loosening pressure plate 9 tilts slightly under the limiting action of the stop bar 8. The inner wall of the ring plate 91 and the outer surface of the hanger 1 form a partially fitted clamping relationship, restricting the downward sliding of the trident upper frame 4 relative to the hanger 1. At this time, if the swing arm 6 accidentally touches the external structure and generates an inward pushing force, the trident upper frame 4 cannot descend. Through the transmission action of the connecting rod 5, the lower end of the swing arm 6 is prevented from retracting synchronously, ensuring the stable clamping state of the hook head on the part and preventing it from falling off.

[0031] Unlocked State / Parts Loading / Unloading: When parts need to be loaded or unloaded, the operator presses down on the free end of the long plate 93, and the force is transmitted through the ring plate 91 to compress the spring 10. At this time, the anti-detachment pressure plate 9 overcomes the tilting tendency and tends to be horizontal, the short plate 92 disengages from the stop bar 8, the inner hole of the ring plate 91 and the lifting rod 1 return to the clearance fit state, and the three-pronged upper frame 4 can slide freely along the lifting rod 1. At this time, manually retracting the lower end of the swing arm 6 can complete the loading and unloading of parts. After loading and unloading, the long plate 93 is released, the spring 10 returns to its original position and pushes the anti-detachment pressure plate 9 back into the locked state, ensuring the reliability of anti-detachment during subsequent lifting processes.

[0032] With the above-mentioned structure in place, the anti-detachment mechanism automatically locks during hoisting to prevent the swing arm from accidentally retracting, and can be unlocked with simple operation during loading and unloading, thus achieving the dual requirements of safety and convenience.

[0033] In another preferred embodiment, the hardness of the anti-detachment pressure plate 9 is greater than that of the suspension rod 1. By increasing the hardness of the anti-detachment pressure plate, wear during long-term clearance sliding with the suspension rod can be reduced, preventing jamming failure due to deformation of the anti-detachment pressure plate, extending the service life of key components, and ensuring the long-term reliability of the anti-detachment locking mechanism.

[0034] In another preferred embodiment, when no external force is applied, the elastic force of the spring 10, combined with the limiting action of the stop bar 8, causes the anti-detachment pressure plate 9 to tilt. The inner hole of the anti-detachment pressure plate 9 abuts against the stop bar 8 to form a locking engagement, restricting the sliding of the lifting rod 1 relative to the triangular frame 4. When the end of the long plate 93 is pressed down, the locking engagement is released, and the lifting rod 1 can slide freely relative to the triangular frame 4. By utilizing the elastic force of the spring and the limiting action of the stop bar to naturally tilt the anti-detachment pressure plate, a "self-tightening" locking engagement is formed, which can stably restrict the relative sliding of the lifting rod and the triangular frame without additional operation. Pressing down the long plate can quickly release the lock, realizing the function of "automatic anti-detachment without operation and unlocking upon operation", balancing the safety of hoisting and the convenience of loading and unloading.

[0035] In another preferred embodiment, the centerline of the upright plate 7 in the width direction is arranged radially along the suspension rod 1. Arranging the upright plate radially along the suspension rod allows the bearing direction of the stop rod and the short plate to be more closely aligned with the suspension rod axis, preventing eccentric loading of the upright plate due to force offset, improving the structural stability of the connection between the upright plate and the three-pronged upper frame, and reducing the risk of deformation after long-term use.

[0036] In another preferred embodiment, the stop bar 8 is a round bar, axially tangent to the concentric circle of the lifting rod 1. The round bar structure reduces contact wear between the stop bar and the short plate, and the tangential arrangement makes the limiting force of the stop bar on the short plate more uniform, avoiding component damage caused by local stress concentration, while ensuring the force stability when the anti-detachment pressure plate is tilted and locked, and improving the durability of the locking mechanism.

[0037] In another preferred embodiment, the distance between the two short plates 92 is greater than or equal to the thickness of the upright plate 7. By providing sufficient clearance, interference between the upright plate and the short plates is avoided during the tilting or resetting of the anti-detachment pressure plate, ensuring smooth swinging of the anti-detachment pressure plate, guaranteeing the reliability of the switching between locked and unlocked states, and reducing mechanical jamming failures.

[0038] In another preferred embodiment, the inner diameter of the ring plate 91 is 1-3 mm larger than the outer diameter of the rod 1. This reasonable gap design satisfies the required movement space for the anti-detachment pressure plate to tilt and lock, while also preventing excessive gap from causing the anti-detachment pressure plate to wobble. This ensures the precision of the fit between the ring plate and the rod, making the localized contact more stable during locking and improving the consistency of the anti-detachment effect.

[0039] In another preferred embodiment, the length of the long plate 93 is more than five times the length of the short plate 92. The long plate 93 serves as a release control end, used to overcome the spring force of the spring 10 by pressing down, causing the ring plate 91 to drive the short plate 92 to disengage from the stop lever 8. The long plate creates a significant leverage effect, requiring only a small downward pressure from the operator to overcome the spring force and release the lock, greatly reducing operational intensity. This is particularly suitable for heavy parts hoisting scenarios, improving the efficiency and convenience of loading and unloading operations.

[0040] In another preferred embodiment, the stop bar 8 is fixed to the upright plate 7, and the upright plate 7 is fixed to the triangular upper frame 4 by welding. This welding connection ensures the rigid fixation of the stop bar, upright plate, and triangular upper frame, preventing loosening or displacement after prolonged stress. It provides a stable support foundation for the anti-detachment locking mechanism and improves the fatigue resistance of the overall lifting device structure. Increasing the friction at the end of the long plate prevents slippage when the operator presses down to unlock, improving operational safety. The rubber sleeve also cushions hand pressure, improving operational comfort, and is especially practical in oily or humid workshop environments.

[0041] In another preferred embodiment, the free end of the long plate 93 is provided with anti-slip texture or covered with a rubber sleeve. The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A lifting device for preventing detachment, comprising a lifting rod (1) and a three-pronged upper frame (4) slidably engaged with the lifting rod (1), characterized in that, The upper surface of the triangular frame (4) is fixed to the upright plate (7), and the upper end of the upright plate (7) is fixed to the stop bar (8); the hanging rod (1) located above the triangular frame (4) is equipped with an anti-detachment pressure plate (9) and a spring (10). The anti-detachment pressure plate (9) includes a ring plate (91) sleeved on the hanging rod (1) and in clearance fit with the hanging rod (1). The ring plate (91) extends toward the upright plate (7) to form two short plates (92) located outside the upright plate (7) and extends away from the upright plate (7) to form a long plate (93). The upper surfaces of the two short plates (92) abut against the stop bar (8). The spring (10) is sleeved on the hanging rod (1) and its two ends abut against the anti-detachment pressure plate (9) and the triangular frame (4) respectively.

2. The anti-detachment lifting device according to claim 1, characterized in that, The hardness of the anti-detachment pressure plate (9) is greater than that of the hanger (1).

3. The anti-detachment lifting device according to claim 1, characterized in that, When no external force is applied, the elastic force of the spring (10) combined with the limiting of the stop bar (8) causes the anti-detachment pressure plate (9) to tilt. The inner hole of the anti-detachment pressure plate (9) abuts against the stop bar (8) to form a locking, which restricts the sliding of the lifting rod (1) relative to the three-pronged upper frame (4). When the end of the pressing long plate (93) is pressed down, the locking is released, and the lifting rod (1) can slide freely relative to the three-pronged upper frame (4).

4. The anti-detachment lifting device according to claim 1, characterized in that, The centerline of the vertical plate (7) in the width direction is arranged radially along the hanging rod (1).

5. The anti-detachment lifting device according to claim 1, characterized in that, The stop bar (8) is a round bar, and its axial direction is tangent to the concentric circle of the hanger (1).

6. The anti-detachment lifting device according to claim 1, characterized in that, The distance between the two short plates (92) is greater than or equal to the thickness of the upright plate (7).

7. The anti-detachment lifting device according to claim 1, characterized in that, The inner diameter of the ring plate (91) is 1-3 mm larger than the outer diameter of the rod (1).

8. The anti-detachment lifting device according to claim 1, characterized in that, The length of the long plate (93) is more than 5 times the length of the short plate (92). The long plate (93) serves as the release control end, used to overcome the elastic force of the spring (10) by pressing down, so that the ring plate (91) drives the short plate (92) to release from the engagement with the stop bar (8).

9. The anti-detachment lifting device according to claim 1, characterized in that, The stop bar (8) is fixed to the upright plate (7), and the upright plate (7) is fixed to the three-pronged upper frame (4) by welding.

10. The anti-detachment lifting device according to claim 1, characterized in that, The free end of the long plate (93) is provided with anti-slip texture or covered with a rubber sleeve.

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