Safe and light lifting chain

Abstract

The utility model discloses a safe and light lifting chain which comprises a top connecting piece, a lifting chain body and a grapnel connecting piece, a tension weighing sensor is fixedly installed at the top end of the grapnel connecting piece, and a servo motor is fixedly installed in the middle of the bottom end of a top plate of the grapnel connecting piece. A PLC is fixedly installed at the position, located on one side of the servo motor, of the bottom end of a top plate of the grapnel connecting piece, a threaded rod is fixedly connected to the driving end of the servo motor, a lifting adjusting plate is in threaded connection to the outer side of the threaded rod, and supporting plates are fixedly connected to the inner sides of two supporting rods at the bottom end of the grapnel connecting piece. Tension data is monitored in real time through the tension weighing sensor, the tension weighing sensor is connected with the PLC, a heavy object can be automatically put down when the tension exceeds a preset threshold value, an operator is helped to find problems in time, equipment damage or safety accidents are avoided, and therefore safety accidents possibly caused by overweight are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of hoisting chains, in particular to a safe and lightweight lifting chain. Background Art

[0002] There are many types of lifting chains, the most common ones are stainless steel chains, alloy steel chains, high-strength chains, high-temperature chains and tension ring chains. These different types of chains have their own unique characteristics and application scenarios. For safe and lightweight lifting chains, the load-bearing performance is generally poor. When the lifting weight is overweight, the chain will break, causing safety hazards. Therefore, a safe and lightweight lifting chain is urgently needed to solve the above problems. Utility Model Content

[0003] The purpose of the utility model is to provide a safe and lightweight lifting chain to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a safe and lightweight lifting chain, comprising a top connecting piece, a lifting chain and a grab hook connecting piece, a tension weighing sensor is fixedly installed on the top of the grab hook connecting piece, a servo motor is fixedly installed on the middle part of the bottom end of the top plate of the grab hook connecting piece, a PLC controller is fixedly installed on the position of the bottom end of the top plate of the grab hook connecting piece located on one side of the servo motor, a threaded rod is fixedly connected to the driving end of the servo motor, a lifting and adjusting plate is threadedly connected to the outer side of the threaded rod, a supporting plate is fixedly connected to the inner sides of two support rods at the bottom end of the grab hook connecting piece, and connecting support rods are respectively rotatably connected to the two ends of the lifting and adjusting plate, one of the connecting support rods is rotatably connected to the first grab hook at one end away from the lifting and adjusting plate, and the other connecting support rod is rotatably connected to the second grab hook at one end away from the lifting and adjusting plate, and a limiting axis is fixedly installed on the bottom ends of the two support rods of the grab hook connecting piece.

[0005] Preferably, a U-shaped connector is nested at the top end of the lifting chain, the top end of the U-shaped connector is fixedly mounted on the bottom end of the top connector, and a fixed connecting plate is provided at the bottom end of the lifting chain.

[0006] Preferably, the bottom end of the fixed connection plate is fixedly mounted on the top end of the tension weighing sensor.

[0007] Preferably, the PLC controller is electrically connected to the tension weighing sensor and the servo motor respectively, and the PLC controller is electrically connected to the control end of the crane control room.

[0008] Preferably, the first grab hook and the second grab hook are both rotatably connected to the limiting shaft, and the first grab hook and the second grab hook are located at positions on the limiting shaft in a cross design.

[0009] Preferably, a notch is provided at a side of the bottom end of the first grabbing hook close to the second grabbing hook, and a protrusion matching the notch of the first grabbing hook is provided at a side of the bottom end of the second grabbing hook close to the first grabbing hook.

[0010] Preferably, the outer side of the lifting adjustment plate is slidably engaged with the inner sides of the two support rods at the bottom end of the grab hook connecting member.

[0011] Preferably, one end of the threaded rod away from the servo motor is rotatably connected to the top end of the support plate.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0013] The utility model monitors the tension data in real time through the tension weighing sensor and is connected with the PLC controller. It can automatically put down the weight when the tension exceeds a preset threshold, helping the operator to find problems in time and avoid equipment damage or safety accidents, thereby avoiding safety accidents that may be caused by overweight. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the main three-dimensional structure of the utility model;

[0015] Figure 2 It is a partial structural schematic diagram of the lifting chain in the utility model;

[0016] Figure 3 It is a schematic diagram of the structure of the grab hook connecting piece in the utility model;

[0017] Figure 4 This is a schematic diagram of the structure of the grab hook connecting member in the utility model in the second state;

[0018] Figure 5 It is a schematic diagram of the structure of the grab hook connecting piece in the utility model.

[0019] In the figure: 1-top connector, 2-lifting chain, 3-hook connector, 4-U-shaped connector, 5-fixed connector plate, 6-tension load cell, 7-threaded rod, 8-lifting adjustment plate, 9-support plate, 10-connecting support rod, 11-first hook, 12-second hook, 13-PLC controller, 14-servo motor, 15-limiting shaft. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-5 The utility model provides an embodiment: a safe and light lifting chain, comprising a top connecting member 1, a lifting chain 2 and a grab hook connecting member 3, a tension weighing sensor 6 is fixedly installed on the top of the grab hook connecting member 3, a servo motor 14 is fixedly installed on the middle of the bottom end of the top plate of the grab hook connecting member 3, a PLC controller 13 is fixedly installed at the position of the bottom end of the top plate of the grab hook connecting member 3 located on one side of the servo motor 14, a threaded rod 7 is fixedly connected to the driving end of the servo motor 14, a lifting adjustment plate 8 is threadedly connected to the outer side of the threaded rod 7, a support plate 9 is fixedly connected to the inner side of the two support rods at the bottom end of the grab hook connecting member 3, and the two ends of the lifting adjustment plate 8 are respectively rotatably connected with connecting support rods 10, one end of one connecting support rod 10 away from the lifting adjustment plate 8 is rotatably connected with a first grab hook 11, and the other end of the other connecting support rod 10 away from the lifting adjustment plate 8 is rotatably connected with a second grab hook 12, and a limit shaft 15 is fixedly installed at the bottom end of the two support rods of the grab hook connecting member 3.

[0022] A U-shaped connector 4 is nested at the top of the lifting chain 2, and the top of the U-shaped connector 4 is fixedly installed on the bottom end of the top connector 1. When in use, the top connector 1 is fixed to the crane by bolts. A fixed connecting plate 5 is provided at the bottom end of the lifting chain 2, and the bottom end of the fixed connecting plate 5 is fixedly installed on the top of a tension weighing sensor 6. The tension weighing sensor 6 is located below the fixed connecting plate 5. When lifting, the weight transmits the tension to the fixed connecting plate 5 through the tension weighing sensor 6, so that the tension data can be monitored in real time.

[0023] The PLC controller 13 is electrically connected to the tension weighing sensor 6 and the servo motor 14 respectively, and is electrically connected to the control end of the crane control room. The opening and closing of the first grab hook 11 and the second grab hook 12 can be controlled through the grab hook connector 3, and the opening and closing of the first grab hook 11 and the second grab hook 12 can be controlled according to the tension data transmitted by the tension weighing sensor 6.

[0024] The first grab hook 11 and the second grab hook 12 are both rotatably connected to the limit shaft 15, and the first grab hook 11 and the second grab hook 12 are located at the limit shaft 15 in a cross design. A notch is provided on the side of the bottom end of the first grab hook 11 close to the second grab hook 12, and a protrusion matching the notch of the first grab hook 11 is provided on the side of the bottom end of the second grab hook 12 close to the first grab hook 11. The notch and the protrusion can provide overlapping support parts between the bottom ends of the first grab hook 11 and the second grab hook 12, thereby enhancing the safety of lifting.

[0025] The outer side of the lifting and adjusting plate 8 is slidably connected to the inner side of the two support rods at the bottom end of the grab hook connecting piece 3, and the lifting and adjusting plate 8 is limited by the two support rods at the bottom end of the grab hook connecting piece 3, so that the lifting and adjusting plate 8 can move up and down through the rotation of the threaded rod 7, and the end of the threaded rod 7 away from the servo motor 14 is rotatably connected to the top of the support plate 9, and the threaded rod 7 is supported by the support plate 9 to prevent the threaded rod 7 from deflecting.

[0026] Working principle: During use, first set the control program for the PLC controller 13, set the tension threshold according to the force strength of the lifting chain 2, and when lifting heavy objects, the user lowers the hook connector 3 to the top of the heavy object through the control end in the crane control room, and then controls the servo motor 14 to rotate, and the driving end of the servo motor 14 drives the threaded rod 7 to rotate. The rotation of the threaded rod 7 drives the lifting and adjusting plate 8 to move downward, and the lifting and adjusting plate 8 moves downward to drive the connecting support rod 10 to rotate and move downward. The movement of the connecting support rod 10 drives the first hook 11 and the second hook 12 to rotate around the limit shaft 15, so that the bottom ends of the first hook 11 and the second hook 12 are separated, and then the lifting rope tied to the heavy object is placed between the first hook 11 and the second hook 12, and then the servo motor 14 is controlled to rotate in the opposite direction, driving the lifting and adjusting plate 8 to move upward, indirectly driving the first hook 11 and the second hook 12 to rotate so that the bottom ends of the first hook 11 and the second hook 12 are tightly attached, and the protrusion at the bottom end of the second hook 12 is tightly inserted into the first hook 11 The user then controls the lifting to start rising. During the rising process, the first grab hook 11 and the second grab hook 12 pull the lifting rope upward and gradually lift the heavy object. At the same time, the first grab hook 11 and the second grab hook 12 transmit the pulling force to the limit shaft 15, and the limit shaft 15 transmits the pulling force to the grab hook connector 3. The grab hook connector 3 pulls the pulling force weighing sensor 6 downward. At this time, the pulling force weighing sensor 6 transmits the pulling force data to the PLC controller 13 in real time. When the pulling force data is less than the predetermined threshold, the user The crane lifts the heavy object and transfers it to the desired position and puts the heavy object down, then controls the servo motor 14 to start and push the lifting and adjusting plate 8 to move downward so that the bottom ends of the first grab hook 11 and the second grab hook 12 are separated and the lifting rope is lowered. When the heavy object exceeds the predetermined threshold, the PLC controller 13 sends a control instruction to control the servo motor 14 to start, push the lifting and adjusting plate 8 to move downward so that the bottom ends of the first grab hook 11 and the second grab hook 12 are separated, thereby unhooking the lifting rope, thereby reminding the construction personnel that the heavy object is too heavy to be lifted.

[0027] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A safe and lightweight lifting chain, comprising a top connector (1), a lifting chain (2) and a grab hook connector (3), characterized in that: A tension weighing sensor (6) is fixedly mounted on the top of the grab hook connecting member (3); a servo motor (14) is fixedly mounted on the middle of the bottom end of the top plate of the grab hook connecting member (3); a PLC controller (13) is fixedly mounted on the bottom end of the top plate of the grab hook connecting member (3) at a position on one side of the servo motor (14); a threaded rod (7) is fixedly connected to the driving end of the servo motor (14); a lifting adjustment plate (8) is threadedly connected to the outer side of the threaded rod (7); and the grab hook connecting member (3) is fixedly mounted on the bottom end of the top plate of the grab hook connecting member (3) at a position on the side of the servo motor (14). (3) A support plate (9) is fixedly connected to the inner sides of the two support rods at the bottom ends, and the two ends of the lifting and adjusting plate (8) are rotatably connected to connecting support rods (10), one end of the connecting support rod (10) away from the lifting and adjusting plate (8) is rotatably connected to a first grabbing hook (11), and the other end of the connecting support rod (10) away from the lifting and adjusting plate (8) is rotatably connected to a second grabbing hook (12), and the bottom ends of the two support rods of the grabbing hook connecting member (3) are fixedly installed with a limiting shaft (15).

2. A safe and light lifting chain according to claim 1, characterized in that: A U-shaped connector (4) is nested at the top end of the lifting chain (2), the top end of the U-shaped connector (4) is fixedly mounted on the bottom end of the top connector (1), and a fixed connecting plate (5) is provided at the bottom end of the lifting chain (2).

3. A safe and light lifting chain according to claim 2, characterized in that: The bottom end of the fixed connection plate (5) is fixedly mounted on the top end of the tension weighing sensor (6).

4. A safe and light lifting chain according to claim 1, characterized in that: The PLC controller (13) is respectively connected to the tension weighing sensor (6) and the servo motor (14) by wires, and the PLC controller (13) is connected to the control end of the crane control room by wires.

5. A safe and light lifting chain according to claim 1, characterized in that: The first grab hook (11) and the second grab hook (12) are both rotatably connected to the limiting shaft (15), and the first grab hook (11) and the second grab hook (12) are located at positions on the limiting shaft (15) in a cross design.

6. A safe and light lifting chain according to claim 1, characterized in that: A notch is provided at the bottom end of the first grab hook (11) on a side close to the second grab hook (12), and a protrusion matching the notch of the first grab hook (11) is provided at the bottom end of the second grab hook (12) on a side close to the first grab hook (11).

7. A safe and light lifting chain according to claim 1, characterized in that: The outer side of the lifting adjustment plate (8) is slidably engaged with the inner sides of the two support rods at the bottom end of the grab hook connecting member (3).

8. A safe and light lifting chain according to claim 1, characterized in that: One end of the threaded rod (7) away from the servo motor (14) is rotatably connected to the top end of the support plate (9).

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