Anti-pinch aluminum bar hanging tongs

Abstract

The utility model provides an anti-pinch aluminum bar hanging clamp. The anti-pinch aluminum bar hanging clamp comprises a hanging clamp body and an auxiliary holding mechanism. The hanging clamp main body comprises an arc-shaped clamping jaw and a parallel four-bar mechanism; the joints of the two groups of parallel four-bar mechanisms are coaxially arranged, the tail end of each group of parallel four-bar mechanisms is fixedly connected with an arc-shaped clamping jaw, and the two arc-shaped clamping jaws which are oppositely arranged draw close to each other to clamp an aluminum bar; the auxiliary holding mechanism is arranged at one joint of the two parallel four-bar mechanisms, and the movable end of the auxiliary holding mechanism serves as a grab handle end to telescopically move in the length direction of the grab handle end so as to be matched with longitudinal movement of the hanging clamp body. According to the utility model, the auxiliary holding mechanism capable of being telescopically adjusted is arranged at the joint of the two groups of parallel four-connecting-rod mechanisms, so that a holding position is provided without influencing hoisting, a safe distance between an operator and a clamping jaw is kept, the operator is prevented from directly holding the hanging clamp main body by hand, and the possibility of being injured by clamping is reduced.

Description

Technical Field

[0001] This utility model relates to the field of lifting clamp technology, and in particular to an anti-pinch aluminum rod lifting clamp. Background Technology

[0002] The mechanical parallel four-bar locking clamp device used in existing aluminum bar hoisting operations consists of a locking system formed by two sets of parallel four-bar mechanisms. When the hoisting device lifts the main body of the lifting equipment via the crane hook, the self-locking characteristic of the four-bar mechanism generates radial contraction motion, driving the bottom jaws to clamp the aluminum bar. During hoisting operations, the lifting equipment experiences significant swaying in its free-hanging state. To ensure the alignment accuracy between the lifting equipment and the aluminum bar, operators habitually use manual straightening to stabilize the equipment. Secondly, the clamping mechanism has invisible clamping points during the locking process. When the jaws enter the critical locking stage, if the operator does not promptly remove their supporting hand, the instantaneous closing force generated by the mechanical locking mechanism can easily cause hand crushing injuries. More importantly, when operators are tracking the position of the aluminum bar for fine-tuning, their attention is diverted, leading to a delay in judging the locking timing, which is a major contributing factor to pinching injuries. Utility Model Content

[0003] Therefore, it is necessary to provide a hand-protecting aluminum rod lifting clamp to address the problem that operators are prone to injury from gripping the clamp during hoisting.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] An anti-pinch aluminum rod lifting clamp includes a clamp body and an auxiliary gripping mechanism.

[0006] The main body of the lifting clamp includes arc-shaped grippers and a parallel four-bar linkage mechanism; the two sets of parallel four-bar linkage mechanisms are coaxially arranged at the connection point, and the end of each set of parallel four-bar linkage mechanisms is fixed with an arc-shaped gripper, and the two opposite arc-shaped grippers come together to clamp the aluminum bar.

[0007] The auxiliary gripping mechanism is located at one of the joints of the two sets of parallel four-bar linkages. The movable end of the auxiliary gripping mechanism serves as the hand gripping end and moves along its length to cooperate with the longitudinal movement of the clamp body.

[0008] Furthermore, the auxiliary gripping mechanism includes a rotating sleeve, a telescopic sleeve, and a handle; the rotating sleeve is detachably fitted onto the outer surface of the connection between the two sets of parallel four-bar linkages, the fixed end of the telescopic sleeve is connected to the rotating sleeve, and the movable end is fixedly connected to the handle.

[0009] Furthermore, the telescopic sleeve includes an outer rod, an inner rod, a spring, and an electric telescopic rod; the outer rod is fixed to the rotating sleeve, one end of the inner rod is limited and slidably placed inside the outer rod, and the other end is located outside the outer rod and connected to the handle, and the spring is placed inside the outer rod to push the inner rod inward; the electric telescopic rod is installed on the outer surface of the outer rod, and the movable end extends radially into the interior of the outer rod and contacts the end of the inner rod to push the inner rod outward.

[0010] Furthermore, the auxiliary gripping mechanism includes a fixed sleeve, a connecting rod, a telescopic sleeve, and a handle; the fixed sleeve is fixedly sleeved on the outer surface of the connection between the two sets of parallel four-bar linkages, one end of the connecting rod is fixedly connected to the fixed sleeve, and the other end is rotatably connected to the fixed end of the telescopic sleeve, and the movable end of the telescopic sleeve is fixedly connected to the handle.

[0011] Furthermore, the telescopic sleeve includes an outer rod, an inner rod, a spring, and an electric telescopic rod; the outer rod is rotatably connected to the connecting rod, one end of the inner rod is limited and slidably placed inside the outer rod, and the other end is located outside the outer rod and connected to the handle, the spring is located inside the outer rod to push the inner rod inward; the electric telescopic rod is installed on the outer surface of the outer rod, and the movable end extends radially into the inner part of the outer rod and contacts the end of the inner rod to push the inner rod outward.

[0012] Furthermore, flexible fabric is detachably installed on the inner side of the arc-shaped grippers on the same side of the two sets of parallel four-bar linkages, and arrayed protrusions are provided on the inner side of the flexible fabric.

[0013] Furthermore, the flexible fabric is detachably connected to the outer side of the curved gripper via Velcro.

[0014] Furthermore, the flexible fabric is detachably connected to the outer side of the arc-shaped gripper via a snap fastener.

[0015] Furthermore, hooks are fitted at the top joints of the two sets of parallel four-bar linkages.

[0016] Furthermore, a limiting ring is provided at the top connection of the two sets of parallel four-bar linkages to restrict the sliding displacement of the hook.

[0017] Compared with the prior art, the beneficial effects of this utility model include:

[0018] 1. By setting an adjustable auxiliary gripping mechanism at the connection of the two sets of parallel four-bar linkages, a handholding position is provided without affecting the hoisting, maintaining a safe distance between the operator and the gripper, avoiding the operator from directly holding the main body of the hoisting clamp, and reducing the possibility of being pinched.

[0019] 2. Flexible cloth can be added to the inside of the arc-shaped gripper to increase the contact area with the aluminum rod and improve the stability of the hoisting. Attached Figure Description

[0020] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein:

[0021] Figure 1 This is a perspective view of an anti-pinch aluminum rod lifting clamp as described in Example 1;

[0022] Figure 2 Based on Figure 1 A front view of an anti-pinch aluminum rod lifting clamp;

[0023] Figure 3 Based on Figure 1 Internal diagram of the telescopic sleeve;

[0024] Figure 4 This is a perspective view of an anti-pinch aluminum rod lifting clamp as described in Example 2;

[0025] Figure 5 This is a perspective view of an anti-pinch aluminum rod lifting clamp as described in Example 3.

[0026] Labels in the diagram: 1. Lifting clamp body; 11. Arc-shaped gripper; 12. Parallel four-bar linkage; 13. Hook; 14. Limiting ring; 2. Auxiliary gripping mechanism; 21. Rotating sleeve; 22. Telescopic sleeve; 221. Outer rod; 222. Inner rod; 223. Spring; 224. Electric telescopic rod; 23. Handle; 24. Fixed sleeve; 25. Connecting rod; 3. Flexible fabric; Detailed Implementation

[0027] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0028] Example 1

[0029] like Figure 1-2 As shown in the figure, this embodiment introduces an anti-pinch aluminum rod lifting clamp, which mainly consists of a clamp body 1 and an auxiliary gripping mechanism 2.

[0030] The lifting clamp body 1 includes arc-shaped grippers 11, a parallel four-bar linkage 12, and a hook 13. The parallel four-bar linkage 12 adopts an existing mechanism, with arc-shaped grippers 11 fixed to the ends of two coaxially arranged parallel four-bar linkages 12. The arc-shaped grippers 11 at the ends of each parallel four-bar linkage 12 form an opposing clamping structure for clamping the aluminum rod. A hook 13 is fitted at the coaxial connection point at the top of the two parallel four-bar linkages 12. The hook 13 has limiting rings 14 on both sides to limit the sliding of the hook 13 at the top coaxial connection point. The limiting rings 14 are made of flexible material and are fitted onto the outer surface of the coaxial connection point, with a clearance fit to limit the hook 13.

[0031] The auxiliary gripping mechanism 2 is located at one of the coaxial joints of the two sets of parallel four-bar linkages 12, and mainly consists of a rotating sleeve 21, a telescopic sleeve 22, and a handle 23. The rotating sleeve 21 is detachably mounted on the coaxial outer surface and can be assembled from two arc-shaped plates using bolts. The rotating sleeve 21 can slide on the coaxial outer surface, and the telescopic sleeve 22 can extend and retract. Figure 3 As shown, the telescopic sleeve 22 preferably consists of an outer rod 221, an inner rod 222, a spring 223, and an electric telescopic rod 224. One end of the outer rod 221 is fixedly connected to the rotating sleeve 21, and the other end is open. One end of the inner rod 222 is located inside the outer rod 221, and the other end is located outside the outer rod 221. The diameter of the end of the inner rod 222 inside the outer rod 221 is larger than that of the other end, and the end inside the outer rod 221 is in contact with the inner wall of the outer rod 221. The end of the outer rod 221 away from the rotating sleeve 21 has an annular structure that closes the gap between the outer rod 221 and the inner rod 222. The spring 223 is located inside the outer rod 221 and is positioned between the annular structure and the inner rod 222, and can push the inner rod 222 inward. The end of the inner rod 222 inside the outer rod 221 is fixedly connected to a handle 23, which is preferably an ergonomic handle with a surface covered with anti-slip rubber. When the clamp moves, the operator can observe the aluminum rod by holding the handle 23 and maintain a safe distance from the parallel four-bar linkage 12 to avoid the risk of being pinched. The telescopic sleeve 22 can cooperate with the movement of the clamp. That is, when the clamp moves, the operator can still hold the handle 23 by telescopic movement.

[0032] Since spring 223 pushes the inner rod 222 inward, the operator can hold the handle 23 as the spring 223 gradually compresses during the upward movement of the clamp, as it moves from low to high. However, when the clamp moves downward, the operator cannot reach the handle 23 in time because the inner rod 222 is initially pushed inward by spring 223. Therefore, an electric telescopic rod 224 is installed outside the outer rod 221. The movable end of the electric telescopic rod 224 extends radially into the outer rod 221 and contacts the end of the inner rod 222. Corresponding holes are also opened on the surface of the outer rod 221 to facilitate the extension and retraction of the electric telescopic rod 224. The electric telescopic rod 224 is preferably battery powered, using a removable high-capacity lithium battery, equipped with a Type-C / Micro USB input or a dedicated charging port, and has a power indicator light or power display screen to provide a reminder when the battery is low, making it convenient for the operator to replace or charge the battery in time.

[0033] As the clamp moves down, the electric telescopic rod 224 retracts, pushing the inner rod 222 outward, and the spring 223 is compressed until the operator touches the handle 23, at which point the electric telescopic rod 224 returns to its original position.

[0034] This embodiment provides a retractable and adjustable auxiliary gripping mechanism 2 at the connection point of the two sets of parallel four-bar linkages 12, which provides a handhold position without affecting the hoisting process, maintains a safe distance between the operator and the gripper, avoids the operator directly holding the main body of the hoisting clamp, and reduces the possibility of being pinched.

[0035] Example 2

[0036] like Figure 4 As shown, this embodiment introduces an anti-pinch aluminum rod lifting clamp, which has a structure basically the same as the anti-pinch aluminum rod lifting clamp introduced in Embodiment 1. The difference is that the auxiliary gripping mechanism 2 in this embodiment includes a fixed sleeve 24, a connecting rod 25, a telescopic sleeve 22, and a handle 23. The fixed sleeve 24 is fixedly sleeved on the outer surface of the coaxial connection of two sets of parallel four-bar linkages 12. One end of the connecting rod 25 is fixedly connected to the fixed sleeve 24. The outer rod 221 of the telescopic sleeve 22 is rotatably connected to the end of the connecting rod 25 away from the fixed sleeve 24. The inner rod 222 of the telescopic sleeve 22 is fixedly connected to the handle 23. It should be emphasized that the telescopic sleeve 22 preferably has the same structure as the telescopic sleeve 22 introduced in Embodiment 1.

[0037] In this embodiment, the handle 23 of the auxiliary gripping mechanism 2 is always in a longitudinal position and maintains a safe distance from the gripping range of the arc-shaped claw. In practical applications, the auxiliary gripping mechanism 2 can be symmetrically arranged according to actual needs, allowing the operator to hold the device on either side.

[0038] Example 3

[0039] like Figure 5As shown, this embodiment introduces an anti-pinch aluminum rod lifting clamp, which has a basically the same structure as the anti-pinch aluminum rod lifting clamp introduced in Embodiment 1. The difference is that the inner side of the arc-shaped gripper 11 on the same side of the two sets of parallel four-bar linkages 12 in this embodiment is provided with a detachable flexible cloth 3, which can be quickly replaced with the arc-shaped gripper 11 through Velcro or snap-on quick-release interface. The working surface of the flexible cloth 3 is molded with a silicone bump array. The flexible cloth 3 can be made of aramid fiber cloth or other materials, as long as it has slight elasticity.

[0040] In this embodiment, a flexible cloth 3 can be added to the inner side of the arc-shaped gripper 11 according to actual needs to increase the contact area with the aluminum rod and improve the stability of hoisting.

[0041] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A hand-clamp-preventing aluminum bar lifting tongs, characterized by, It includes: The tongs body (1) includes arc-shaped clamping jaw (11) and parallel four-bar linkage (12); the joint of two sets of parallel four-bar linkage (12) is coaxial, and the end of each set of parallel four-bar linkage (12) is fixedly connected with arc-shaped clamping jaw (11), and the two oppositely arranged arc-shaped clamping jaws (11) are close to each other to clamp the aluminum bar; The auxiliary holding mechanism (2) is arranged at the joint of one of the two sets of parallel four-bar linkage (12), and the movable end of the auxiliary holding mechanism (2) is used as a handheld end and moves along the length direction to cooperate with the longitudinal movement of the tongs body (1).

2. The anti-pinch aluminum bar hoist tongs of claim 1, wherein, The auxiliary holding mechanism (2) includes rotating sleeve (21), telescopic sleeve (22) and handle (23); the rotating sleeve (21) is detachably sleeved on the outer surface of the joint of the two sets of parallel four-bar linkage (12), the fixed end of the telescopic sleeve (22) is connected with the rotating sleeve (21), and the movable end is fixedly connected with the handle (23).

3. The anti-pinch aluminum bar hoist tongs of claim 2, wherein, The telescopic sleeve (22) includes outer rod (221), inner rod (222), spring (223) and electric telescopic rod (224); the outer rod (221) is fixedly connected with the rotating sleeve (21), one end of the inner rod (222) is limitingly and slidably arranged in the outer rod (221), the other end is located outside the outer rod (221) and connected with the handle (23), and the spring (223) is arranged in the outer rod (221) to inwardly push the inner rod (222); the electric telescopic rod (224) is installed on the outer surface of the outer rod (221), the movable end extends radially into the outer rod (221) and contacts the end of the inner rod (222) to outwardly push the inner rod (222).

4. The anti-pinch aluminum bar hoist tongs of claim 1, wherein, The auxiliary holding mechanism (2) includes fixed sleeve (24), connecting rod (25), telescopic sleeve (22) and handle (23); the fixed sleeve (24) is fixedly sleeved on the outer surface of the joint of the two sets of parallel four-bar linkage (12), one end of the connecting rod (25) is fixedly connected with the fixed sleeve (24), the other end is rotatably connected with the fixed end of the telescopic sleeve (22), and the movable end of the telescopic sleeve (22) is fixedly connected with the handle (23).

5. The anti-pinch aluminum bar hoist tongs of claim 4, wherein, The telescopic sleeve (22) includes outer rod (221), inner rod (222), spring (223) and electric telescopic rod (224); the outer rod (221) is rotatably connected with the connecting rod (25), one end of the inner rod (222) is limitingly and slidably arranged in the outer rod (221), the other end is located outside the outer rod (221) and connected with the handle (23), and the spring (223) is arranged in the outer rod (221) to inwardly push the inner rod (222); the electric telescopic rod (224) is installed on the outer surface of the outer rod (221), the movable end extends radially into the outer rod (221) and contacts the end of the inner rod (222) to outwardly push the inner rod (222).

6. The anti-pinch aluminum bar hoist tongs of claim 1, wherein, The inner side of the arc-shaped clamping jaw (11) on the same side of the two sets of parallel four-bar linkage (12) is detachably provided with flexible cloth (3), and the inner side of the flexible cloth (3) is provided with an array of protrusions.

7. The anti-pinch aluminum bar hoist tongs of claim 6, wherein, The flexible cloth (3) and the outer side of the arc-shaped clamping jaw (11) are detachably connected through magic tape.

8. The anti-pinch aluminum bar hoist tongs of claim 6, wherein, The flexible cloth (3) and the outer side of the arc-shaped clamping jaw (11) are detachably connected through buckle.

9. The anti-pinch aluminum bar hoist of claim 1, wherein, The joint of the top of the two sets of parallel four-bar linkage (12) is sleeved with a hook (13).

10. The anti-pinch aluminum bar hoist tongs of claim 9, wherein, A limiting ring (14) is arranged at the joint of the top of the two parallel four-bar linkages (12) to limit the sliding displacement of the lifting hook (13).

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