An auxiliary lifting device for a gantry crane

Abstract

This utility model belongs to the field of auxiliary lifting device technology, specifically relating to an auxiliary lifting device for a gantry crane. It includes a fixed frame, with a tie rod slidably inserted in the middle of the fixed frame. The upper and lower ends of the tie rod are connected to a lifting ring and a connecting seat, respectively. Connecting rod one and connecting rod two are rotatably connected to the end of the fixed frame. Connecting rod one and connecting rod two are rotatably connected to a gripper. The connecting seat is rotatably connected to a support rod, and the support rod is rotatably connected to connecting rod two. An adaptive clamp is mounted on the gripper, comprising a clamping block one and a clamping block two. Clamping block one is rotatably installed in a rotating groove on the gripper, and clamping block two is rotatably installed in a groove on clamping block one. Both clamping blocks one and two are semi-cylindrical structures. By clamping workpieces with uneven surfaces, and then lifting the workpiece by attaching the lifting ring to the crane hook, the adaptive clamp automatically conforms to the surface of the workpiece under its own weight, thereby stably lifting the workpiece.

Description

Technical Field

[0001] This utility model belongs to the field of auxiliary lifting equipment technology, specifically relating to an auxiliary lifting equipment for a gantry crane. Background Technology

[0002] In modern industrial logistics, gantry cranes, as large lifting equipment, are widely used in ports, docks, factory workshops, and other settings to handle the loading, unloading, and transportation of heavy workpieces, containers, and other large goods. Auxiliary spreading tools, as a crucial component of gantry cranes, directly impact the efficiency, safety, and reliability of lifting operations. However, existing gantry crane auxiliary spreading tools on the market currently suffer from numerous problems in practical applications, making it difficult to meet the lifting demands under complex working conditions.

[0003] The main problem with existing auxiliary lifting tools lies in their insufficient adaptability to irregular workpieces. Traditional lifting tools mostly employ fixed jaws or simple hydraulic clamping structures, designed for workpieces with flat surfaces and regular shapes, such as steel plates and containers. When dealing with workpieces with uneven surfaces and complex shapes (such as large castings and forgings, and engineering machinery parts), the jaws of traditional lifting tools struggle to maintain a tight fit with the workpiece surface, easily leading to insecure clamping, workpiece swaying, or even detachment, seriously threatening operational safety. For example, when lifting large engine blocks, whose surfaces have complex holes and bosses, traditional jaws can only contact localized areas, failing to generate uniform clamping force. This causes the workpiece's center of gravity to shift during lifting, increasing operational difficulty and safety hazards. Utility Model Content

[0004] To address the above problems, the purpose of this utility model is to provide an auxiliary lifting device for gantry cranes, solving the problems of insufficient adaptability to irregular workpieces and poor clamping stability of existing auxiliary lifting devices for gantry cranes.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an auxiliary lifting device for a gantry crane, comprising a fixed frame, a tie rod slidably inserted in the middle of the fixed frame, a lifting ring connected to the top of the tie rod, a connecting seat installed on the bottom side of the tie rod, a connecting rod one and a connecting rod two rotatably connected to the end of the fixed frame via a pin, the connecting rod one and the connecting rod two being arranged in parallel and their bottom ends being rotatably connected to a gripper via a pin, the connecting seat being rotatably connected to one end of a support rod via a pin, the other end of the support rod being rotatably connected to the connecting rod two via a pin, an adaptive clamping clamp being installed on the gripper, the adaptive clamping clamp comprising a clamping block one and a clamping block two, the clamping block one being rotatably installed in a rotating groove opened on the gripper, and the clamping block two being rotatably installed in a groove opened on the clamping block one, both the clamping block one and the clamping block two being semi-cylindrical structures.

[0006] The beneficial effects of this utility model are as follows: when a workpiece with an uneven surface is gripped by a clamp, and then the workpiece is lifted by the hook of the crane with a lifting ring, the adaptive clamp automatically fits into the surface of the workpiece under its own weight, thereby stably lifting the workpiece.

[0007] In order for the grippers to hold the workpiece securely;

[0008] As a further improvement to the above technical solution: the first connecting rod and the second connecting rod are of the same length, and the multiple grippers are arranged around the axis of the pull rod, and the side of the gripper with the adaptive clamp is parallel to the axis of the pull rod.

[0009] The beneficial effects of this improvement are as follows: when the pull rod is pulled upward, the second connecting rod is pulled by the support rod, which causes the first connecting rod and the second connecting rod to move the gripper inward, and the workpiece is stably clamped by the gripper through the parallelogram linkage mechanism.

[0010] To ensure the stability of the gripper's hold;

[0011] As a further improvement to the above technical solution: the number of grippers is not less than three, and they are evenly arranged around the axis of the pull rod.

[0012] The beneficial effects of this improvement are: multiple grippers can firmly hold the workpiece, ensuring the safety of hoisting.

[0013] In order to effectively fit and clamp irregularly shaped workpieces by using adaptive clamps;

[0014] As a further improvement to the above technical solution: the number of clamping blocks one installed on each of the grippers is not less than two, and the number of clamping blocks two installed on each of the clamping blocks one is not less than two.

[0015] The beneficial effects of this improvement are: multiple clamping blocks one and clamping block two can rotate independently under clamping pressure to fit the surface of the workpiece for stable clamping.

[0016] To ensure the stability of the rotation of clamping block one and clamping block two;

[0017] As a further improvement to the above technical solution: both end faces of clamping block one and clamping block two are formed with convex rings, and the axis of the convex rings is collinear with the axis of clamping block one and clamping block two. The rotating groove and the inner wall of the groove opened on clamping block one are formed with limiting grooves for sliding connection of convex rings, and limiting pins are embedded in the limiting grooves.

[0018] The beneficial effects of this improvement are as follows: the limiting pin plays a limiting role. When clamping block one and clamping block two rotate to a certain angle, the end of the convex ring touches the limiting pin and is limited by the limiting pin, thereby preventing clamping block one and clamping block two from detaching and falling off.

[0019] For easy installation;

[0020] As a further improvement to the above technical solution: the limiting groove passes through one side of the clamping claw and the clamping block.

[0021] The beneficial effects of this improvement are: clamping block one and clamping block two can be easily slid into the groove, and then the limiting pin can be installed and positioned.

[0022] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the gripper and adaptive clamp in this utility model;

[0025] Figure 3 This is a schematic diagram of the gripper structure in this utility model;

[0026] Figure 4 This is a schematic diagram of the adaptive clamp in this utility model;

[0027] In the diagram: 1. Fixing frame; 2. Tie rod; 3. Lifting ring; 4. Connecting rod one; 5. Connecting rod two; 6. Support rod; 7. Connecting seat; 8. Gripper; 81. Rotating groove; 82. Limiting groove; 9. Adaptive clamp; 10. Clamping block one; 101. Protruding ring; 11. Clamping block two; 12. Limiting pin. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.

[0029] Example 1:

[0030] like Figure 1 — Figure 4As shown: An auxiliary lifting device for a gantry crane includes a fixed frame 1. A tie rod 2 is slidably inserted into the middle of the fixed frame 1. A lifting ring 3 is connected to the top of the tie rod 2. A connecting seat 7 is installed on the bottom side of the tie rod 2. A connecting rod 4 and a connecting rod 5 are rotatably connected to the end of the fixed frame 1 via a pin. The connecting rod 4 and the connecting rod 5 are arranged in parallel, and their bottom ends are rotatably connected to a gripper 8 via a pin. The connecting seat 7 is rotatably connected to one end of a support rod 6 via a pin. The other end of the support rod 6 is rotatably connected to the connecting rod 5 via a pin. An adaptive clamp 9 is installed on the gripper 8. The adaptive clamp 9 includes a clamping block 10 and a clamping block 2 11. Clamping block 10 is rotatably mounted in a rotating groove 81 on the jaw 8, and clamping block 21 is rotatably mounted in a groove on clamping block 10. Both clamping block 10 and clamping block 211 are semi-cylindrical structures. The jaw 8 clamps workpieces with uneven surfaces. When the crane hook is attached to the lifting ring 3 to lift the workpiece, the adaptive clamp 9 automatically conforms to the surface of the workpiece under its own weight, thereby stably lifting the workpiece. The connecting rod 1 and connecting rod 2 are of the same length. Multiple jaws 8 are arranged around the axis of the pull rod 2, and the side of the jaw 8 with the adaptive clamp 9 is parallel to the axis of the pull rod 2. When the pull rod 2 is pulled upward, the connecting rod 25 is pulled by the support rod 6, so that the connecting rod 21... Connecting rod 4 and connecting rod 5 drive the gripper 8 to move inward, and through the parallelogram linkage mechanism, the gripper 8 stably clamps the workpiece. There are at least three grippers 8, evenly arranged around the axis of the connecting rod 2. Multiple grippers 8 can firmly clamp the workpiece, ensuring the safety of the lifting operation. Each gripper 8 is equipped with at least two clamping blocks 10, and each clamping block 10 is equipped with at least two clamping blocks 11. Under clamping pressure, the clamping blocks 10 and 11 can rotate independently to conform to the surface of the workpiece for stable clamping. Both end faces of the clamping blocks 10 and 11 are formed with protruding rings 101, and the axis of the protruding rings 101... The axis of the line is collinear with that of clamping block 10 and clamping block 21. The rotating groove 81 and the inner wall of the groove opened on clamping block 10 are both formed with limiting grooves 82 for sliding connection of protruding ring 101. Limiting pin 12 is embedded in the limiting groove 82. The limiting pin 12 plays a limiting role. When clamping block 10 and clamping block 21 rotate to a certain angle, the end of the protruding ring 101 touches the limiting pin 12 and is limited by the limiting pin 12, thereby preventing clamping block 10 and clamping block 21 from falling off. The limiting groove 82 passes through one side of the clamping claw 8 and clamping block 10. Clamping block 10 and clamping block 21 can be easily slid into the groove, and then the limiting pin 12 is installed and positioned.

[0031] The working principle of this technical solution is as follows: When a workpiece needs to be hoisted, the operator pushes the workpiece below the gripper 8, so that the workpiece is located at the center of the multiple grippers 8. The crane hook lifts the lifting ring 3 upward, and the pull rod 2 slides upward under the pulling force of the hook. At this time, the connecting seat 7 moves upward, and the connecting rod 2 pulls the connecting rod 5 through the support rod 6, so that the connecting rod 1 4 and the connecting rod 2 5 drive the gripper 8 to move further inward and clamp the workpiece. During the clamping process, the clamping block 10 on the gripper 8 is rotatably installed in the rotating groove 81, and the clamping block 2 11 is rotatably installed in the groove of the clamping block 10. When the gripper 8 contacts the surface of the workpiece, the weight of the workpiece and the clamping force will cause the clamping block 10 and the clamping block 2 11 to be subjected to pressure. Since the clamping block 10 and the clamping block 2 11 are both semi-cylinders... The structure includes at least two clamping blocks 10 and 21 installed on each jaw 8. Multiple clamping blocks 10 and 21 will rotate under pressure, automatically conforming to the concave and convex surfaces of the workpiece. The convex rings 101 on the end faces of clamping blocks 10 and 21 cooperate with the rotating groove 81 and the limiting groove 82 on the inner wall of the groove. The limiting pins 12 are embedded in the limiting groove 82, which can prevent clamping blocks 10 and 21 from rotating excessively and falling off, ensuring the stability of rotation. When the workpiece is hoisted into place and needs to be unloaded, the crane hook slowly descends, the pull rod 2 slides down under the weight of the workpiece, and the jaws 8 gradually loosen. After the operator places the workpiece in place, he pulls the pull rod 2 down again to fully open the jaws 8, and the lifting device can be removed from the workpiece.

[0032] It should be noted that, in this document, 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. Specific examples have been used in this document to illustrate the principles and implementation methods of the invention; these examples are merely for the purpose of helping to understand the method and core ideas of the invention. The above descriptions are only preferred embodiments of the invention. It should be pointed out that, due to the limitations of written expression, there are objectively infinite specific structures. For those skilled in the art, several improvements, modifications, or variations can be made without departing from the principles of the invention, and the above technical features can be combined in an appropriate manner. These improvements, modifications, variations, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this invention.

Claims

1. An auxiliary spreader for a portal crane, characterized in that: The device includes a fixed frame (1), a pull rod (2) is slidably inserted in the middle of the fixed frame (1), a lifting ring (3) is connected to the top of the pull rod (2), a connecting seat (7) is installed on the bottom side of the pull rod (2), a connecting rod one (4) and a connecting rod two (5) are rotatably connected to the end of the fixed frame (1) by a pin, the connecting rod one (4) and the connecting rod two (5) are arranged in parallel and the bottom ends of the connecting rod one (4) and the connecting rod two (5) are rotatably connected to a clamp (8) by a pin, and the connecting seat (7) is rotatably connected to a support by a pin. One end of the rod (6) and the other end of the support rod (6) are rotatably connected to the connecting rod two (5) via a pin. An adaptive clamp (9) is installed on the jaw (8). The adaptive clamp (9) includes a clamping block one (10) and a clamping block two (11). The clamping block one (10) is rotatably installed in the rotating groove (81) opened on the jaw (8). The clamping block two (11) is rotatably installed in the groove opened on the clamping block one (10). Both the clamping block one (10) and the clamping block two (11) are semi-cylindrical structures.

2. A supplemental spreader for a portal crane according to claim 1, characterized in that: The first connecting rod (4) and the second connecting rod (5) are of the same length. Multiple grippers (8) are arranged around the axis of the pull rod (2), and one side of the gripper (8) equipped with an adaptive clamp (9) is parallel to the axis of the pull rod (2).

3. A supplemental spreader for a portal crane according to claim 1, characterized in that: The number of grippers (8) is not less than three, and they are evenly arranged around the axis of the pull rod (2).

4. A supplemental spreader for a portal crane according to claim 1, characterized in that: The number of clamping blocks 1 (10) installed on each of the grippers (8) is not less than two, and the number of clamping blocks 2 (11) installed on each of the clamping blocks 1 (10) is not less than two.

5. A supplemental spreader for a portal crane according to claim 1, characterized in that: Both end faces of the clamping block one (10) and clamping block two (11) are formed with protruding rings (101), and the axis of the protruding rings (101) is collinear with the axis of clamping block one (10) and clamping block two (11). The rotating groove (81) and the inner wall of the groove opened on the clamping block one (10) are formed with limiting grooves (82) for sliding connection of the protruding rings (101), and limiting pins (12) are embedded in the limiting grooves (82).

6. A supplemental spreader for a portal crane according to claim 5, characterized in that: The limiting groove (82) passes through one side of the gripper (8) and the clamping block (10).

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