Limiting device of lifting chain and chain hoist

Abstract

The utility model provides a limiting device of a hoisting chain and a chain hoist, and particularly relates to the field of hoisting equipment. The limiting device of the lifting chain comprises a fixed plate, a movable plate, a connecting rod and a limiting switch. The movable plate and the fixed plate are oppositely arranged; one end of the connecting rod is fixedly connected with the movable plate, and the other end of the connecting rod penetrates through the fixed plate and is rotationally connected with a lifting chain; the limit switch is used for being electrically connected with an external controller; wherein a shifting piece is fixedly arranged on the movable plate, and when the movable plate moves towards one side of the fixed plate, the shifting piece can trigger the limiting switch. According to the limiting device, when the lifting chain is straightened, the connecting rod drives the movable plate to move towards one side of the fixed plate, and the shifting piece on the movable plate triggers the limiting switch, so that an electric control signal is sent to the controller, the driving device is controlled to stop running, the function of limiting the lifting chain is achieved, and the lifting chain is prevented from being disengaged from the chain hoist.

Description

Technical Field

[0001] The utility model relates to the field of lifting equipment, in particular to a limit device for a lifting chain and a ring chain hoist. Background Art

[0002] A ring chain hoist is a light and small lifting equipment, which is favored for its strong lifting capacity and high working efficiency, and is widely used in industrial fields such as manufacturing, logistics, and construction. The lifting chain of the ring chain hoist is one of its core components, and heavy objects can be lifted or lowered through the lifting chain. The limit device of the lifting chain is an important component to ensure the safe operation of the ring chain hoist. Its function is to automatically cut off the power supply when the lifting chain of the ring chain hoist reaches the maximum or minimum working range, preventing the lifting chain from being overwound or emptied, thereby avoiding damage to the equipment or operators. In the prior art, the limit device is arranged below the ring chain hoist body. When the heavy object descends and triggers the limit device, the kinetic energy of the heavy object may be directly transmitted to the ring chain hoist body, easily causing damage to the ring chain hoist body. Summary of the Utility Model

[0003] In view of the above-mentioned disadvantages of the prior art, the utility model provides a limit device for a lifting chain and a ring chain hoist to improve the problem that the existing limit device is prone to damage the ring chain hoist body when triggered.

[0004] To achieve the above object and other related objects, the utility model provides a limit device for a lifting chain. The limit device for the lifting chain includes a fixed plate, a moving plate, a connecting rod, and a limit switch. The moving plate is arranged opposite to the fixed plate; one end of the connecting rod is fixedly connected to the moving plate, and the other end of the connecting rod penetrates through the fixed plate and is rotatably connected to the lifting chain; the limit switch is used for electrically connecting with an external controller; wherein, a dial is fixedly arranged on the moving plate, and when the moving plate moves towards the side of the fixed plate, the dial can trigger the limit switch.

[0005] In an example of the utility model, the limit device includes a first guiding member. The first guiding member is arranged between the fixed plate and the moving plate. One end of the first guiding member is fixedly connected to the fixed plate, and the other end of the first guiding member passes through the moving plate and stops at the bottom of the moving plate.

[0006] In an example of the utility model, the limit device further includes a second guiding member. The second guiding member includes a guiding plate and a guiding shaft. One end of the guiding plate is fixedly connected to the fixed plate, the other end of the guiding plate extends towards the side of the moving plate, the guiding shaft is fixedly arranged on the side of the moving plate facing the guiding plate, a long hole is arranged on the guiding plate, and the guiding shaft can slide along the long hole.

[0007] In an example of the present utility model, the limit switch is fixedly arranged on the fixed plate through a switch seat. One end of the switch seat is fixedly connected to the fixed plate, and the other end of the switch seat extends towards the side close to the moving plate. The switch seat is arranged outside the moving plate. A through hole for the limit switch to pass through is arranged on the switch seat, and the limit switch is clamped in the through hole of the switch seat.

[0008] In an example of the present utility model, the limiting device further includes an elastic member. One end of the elastic member is connected to the fixed plate, and the other end of the elastic member is fixedly connected to the moving plate.

[0009] The present utility model also provides a chain hoist, which includes a lifting chain and the limiting device for the above-mentioned lifting chain.

[0010] In an example of the present utility model, the chain hoist further includes a chain box for placing the lifting chain, and the limiting device is fixedly arranged at the bottom of the chain box.

[0011] In an example of the present utility model, the limiting device further includes a mounting plate. One side of the mounting plate is fixedly connected to the bottom wall of the chain box, and the other side of the mounting plate is detachably connected to the fixed plate. Through holes matching the connecting rod are arranged on the bottom wall of the chain box, the mounting plate and the fixed plate. The connecting rod sequentially passes through the fixed plate, the mounting plate and the bottom wall of the chain box and is connected to the end of the lifting chain.

[0012] In an example of the present utility model, the chain hoist is used in cooperation with a numerical control crane. A baffle is fixedly installed on the frame of the numerical control crane. A through hole for the lifting chain to pass through is arranged on the baffle. A stopper capable of stopping outside the through hole is arranged on the lifting chain between the through hole and the limiting device. And when the limiting device stops at the lower part of the chain box, the distance h from the stopper to the through hole is greater than the stroke when the dial in the limiting device triggers the limit switch, so as to limit the lifting chain when the limiting device fails.

[0013] In an example of the present utility model, the limiting device is installed on the side of the baffle facing the chain box.

[0014] For the limiting device of the lifting chain provided by the present utility model, one end of the connecting rod is rotatably connected to the lifting chain, and the other end of the connecting rod is fixedly connected to the moving plate. When the lifting chain is straightened, the connecting rod drives the moving plate to move towards the fixed plate side, and the dial on the moving plate triggers the limit switch, thereby sending an electric control signal to the controller and controlling the driving device to stop running, realizing the limiting function of the lifting chain and preventing the lifting chain from disengaging from the chain hoist. Description of the Drawings

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 Structural schematic diagram of the limit device for the lifting chain of the present invention in an embodiment;

[0017] Figure 2 Schematic diagram of the cooperation between the chain hoist of the present invention and the numerical control crane in an embodiment;

[0018] Figure 3 Schematic diagram of the cooperation between the chain hoist of the present invention and the numerical control crane in another embodiment.

[0019] Element number description

[0020] 1. Chain hoist; 10. Limit device; 100. Fixed plate; 110. Switch seat; 120. First guide member; 130. Second guide member; 131. Guide plate; 132. Guide shaft; 200. Moving plate; 210. Paddle; 300. Connecting rod; 400. Limit switch; 500. Mounting plate; 600. Elastic member; 20. Lifting chain; 21. Stopper; 30. Chain box; 2. Numerical control crane; 201. Baffle. Specific implementation manners

[0021] The following illustrates the implementation manners of the present invention through specific specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through different specific implementation manners. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. It should also be understood that the terms used in the embodiments of the present invention are for the purpose of describing specific specific implementation manners, rather than for limiting the protection scope of the present invention. The test methods without specific conditions noted in the following embodiments are usually carried out under conventional conditions or according to the conditions recommended by each manufacturer.

[0022] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present utility model. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope of implementation of the present utility model.

[0023] Please refer to Figure 1 and Figure 2 , the present utility model provides a limiting device 10 for a lifting chain. The limiting device 10 includes a fixed plate 100, a moving plate 200, a connecting rod 300 and a limit switch 400. The moving plate 200 is disposed opposite to the fixed plate 100, and a dial 210 is provided on the moving plate 200; one end of the connecting rod 300 is fixedly connected to the moving plate 200, the other end of the connecting rod 300 passes through the fixed plate 100 and is rotatably connected to the lifting chain 20, and the limit switch 400 is used for electrical connection with an external controller. When the lifting chain 20 is straightened, the connecting rod 300 drives the moving plate 200 to move toward the fixed plate 100, and the dial 210 on the moving plate 200 triggers the limit switch 400, thereby sending an electric control signal to the controller and controlling the driving device to stop running, realizing the limiting function of the lifting chain 20 and preventing the lifting chain 20 from disengaging from the ring chain hoist 1.

[0024] Please refer to Figure 1 , in an embodiment, the limit switch 400 is fixedly arranged on the fixed plate 100 through a switch seat 110. One end of the switch seat 110 is fixedly connected to the fixed plate 100, the other end of the switch seat 110 extends toward the side close to the moving plate 200, and the switch seat 110 is arranged outside the moving plate 200. A through hole for the limit switch 400 to pass through is provided on the fixed plate 100, and the limit switch 400 is clamped in the through hole. Further, a protective cover is provided on the fixed plate 100, and the cable of the limit switch 400 is led out through a stainless steel waterproof joint, and the stainless steel waterproof joint is fixed on the protective cover to avoid chemical corrosion and extend the service life of the equipment.

[0025] Please refer to Figure 1, in one embodiment, the limiting device 10 further includes a first guiding member 120. The first guiding member 120 is disposed between the fixed plate 100 and the moving plate 200. One end of the first guiding member 120 is fixedly connected to the fixed plate 100, and the other end of the first guiding member 120 passes through the moving plate 200 and abuts against the bottom of the moving plate 200. Further, the limiting device 10 further includes a second guiding member 130. The second guiding member 130 includes a guiding plate 131 and a guiding shaft 132. One end of the guiding plate 131 is fixedly connected to the fixed plate 100, and the other end of the guiding plate 131 extends toward one side of the moving plate 200. The guiding shaft 132 is fixedly disposed on the side of the moving plate 200 facing the guiding plate 131. A long hole is provided on the guiding plate 131, and the guiding shaft 132 can slide along the long hole. The first guiding member 120 and the second guiding member 130 can not only ensure that the moving plate 200 moves along a predetermined trajectory during movement, preventing deviation from the predetermined path, but also provide necessary support for the moving plate 200 to ensure its stability during movement. There is no limitation on the number of the first guiding member 120 and the second guiding member 130 here, and they can be adaptively adjusted according to the usage requirements. Exemplarily, there are two first guiding members 120 and two second guiding members 130. The two first guiding members 120 are disposed on both sides of the fixed plate 100 and the moving plate 200 in the length direction, and the two second guiding plates 131 are disposed on both sides of the fixed plate 100 and the moving plate 200 in the width direction.

[0026] Please refer to Figure 1 and Figure 2 , in one embodiment, the limiting device 10 further includes an elastic member 600. One end of the elastic member 600 is connected to the fixed plate 100, and the other end of the elastic member 600 is fixedly connected to the moving plate 200. When the lifting chain 20 continues to move upward due to inertia, the elastic member 600 can prevent mechanical damage to the limiting device 10 and the chain box 30. There is no limitation on the specific type of the elastic member 600 here. The elastic member 600 can be any component that can provide a buffering effect and can automatically reset, including but not limited to springs and rubber pads. In this embodiment, the elastic member 600 is a spring, and the spring is sleeved on the corresponding first guiding member 120.

[0027] Please refer to Figure 2 and Figure 3 , the present utility model further provides a ring chain hoist 1. The ring chain hoist 1 includes a lifting chain 20 and the limiting device 10 for the lifting chain. The lifting chain 20 is rotatably connected to the connecting rod 300 of the limiting device 10. Exemplarily, the connecting rod 300 is rotatably connected to the lifting chain 20 through a chain buckle. Specifically, a connecting hole is provided at the top of the connecting rod 300. One end of the chain buckle is rotatably connected to the lifting chain 20, and the other end of the chain buckle is rotatably connected to the connecting rod 300 through the connecting hole.

[0028] Please refer toFigure 2 and Figure 3 In one embodiment, the chain hoist 1 further includes a chain box 30 for placing the lifting chain 20, and the limiting device 10 is fixedly arranged at the bottom of the chain box 30. Further, for the convenience of overhaul and replacement of the limiting device 10, the limiting device 10 further includes a mounting plate 500. One side of the mounting plate 500 is fixedly connected to the bottom wall of the chain box 30, and the other side of the mounting plate 500 is detachably connected to the fixing plate 100. The connection mode between the bottom wall of the chain box 30 and the mounting plate 500 includes but is not limited to welding, and the mounting plate 500 and the fixing plate 100 are detachably connected by screws. Through holes matching the connecting rod 300 are arranged on the bottom wall of the chain box 30, the mounting plate 500 and the fixing plate 100. The connecting rod 300 sequentially passes through the fixing plate 100, the mounting plate 500 and the bottom wall of the chain box 30 and is connected to the end of the lifting chain 20. Exemplarily, the connecting rod 300 and the moving plate 200 are fixedly connected by nuts.

[0029] Please refer to Figure 2 and Figure 3 In one embodiment, the chain hoist 1 is used in cooperation with a numerically controlled crane 2. A baffle 201 is fixedly installed on the vehicle frame of the numerically controlled crane 2. A stopper 21 capable of stopping outside the through hole is arranged on the lifting chain 20 between the through hole and the limiting device 10. When the limiting device 10 stops below the chain box 30, the distance h from the stopper 21 to the through hole is greater than the stroke when the dial 210 in the limiting device 10 triggers the limit switch 400, so as to limit the lifting chain 20 when the limiting device 10 fails. Further, the distance h between the stopper 21 and the baffle 201 is adaptively adjusted according to the compression amount of the elastic member 600. When the lifting chain 20 is straightened, the connecting rod 300 can still drive the moving plate 200 to move upward continuously. Before the elastic member 600 reaches the compression limit height, the stopper 21 touches the fixing plate 100 of the trolley frame or the chain hoist 1 to form a mechanical brake. In this embodiment, the limiting device 10 can also be installed on the side of the baffle 201 facing the chain box 30.

[0030] For the limiting device of the lifting chain provided by the present utility model, one end of the connecting rod is rotatably connected to the lifting chain, and the other end of the connecting rod is fixedly connected to the moving plate. When the lifting chain is straightened, the connecting rod drives the moving plate to move towards the fixing plate side, and the dial on the moving plate triggers the limit switch, thereby sending an electric control signal to the controller and controlling the driving device to stop running, realizing the limiting function of the lifting chain and preventing the lifting chain from slipping out of the chain hoist. And this device has high reliability and a compact structure, and can meet the normal working requirements in toxic and radioactive environments. Therefore, the present utility model effectively overcomes some practical problems in the prior art and thus has high utilization value and practical significance.

[0031] The above embodiments are only illustrative of the principles and effects of the present utility model, and are not intended to limit the present utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present utility model. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present utility model should still be covered by the claims of the present utility model.

Claims

1. A lifting chain limiting device, characterized in that: include: Fixed plate; A movable plate, arranged opposite to the fixed plate; A connecting rod, one end of which is fixedly connected to the movable plate, and the other end of which passes through the fixed plate and is rotatably connected to the lifting chain; A limit switch, used for electrical connection with an external controller; Wherein, a paddle is fixedly arranged on the movable plate, and when the movable plate moves toward one side of the fixed plate, the paddle can trigger the limit switch.

2. The lifting chain limiting device according to claim 1, characterized in that: The limiting device includes a first guide member, which is arranged between the fixed plate and the movable plate, one end of the first guide member is fixedly connected to the fixed plate, and the other end of the first guide member passes through the movable plate and stops at the bottom of the movable plate.

3. The lifting chain limiting device according to claim 1, characterized in that: The limiting device also includes a second guide member, which includes a guide plate and a guide shaft. One end of the guide plate is fixedly connected to the fixed plate, and the other end of the guide plate extends toward one side of the movable plate. The guide shaft is fixedly arranged on the side of the movable plate facing the guide plate. A long hole is arranged on the guide plate, and the guide shaft can slide along the long hole.

4. The lifting chain limiting device according to claim 1, characterized in that: The limit switch is fixedly arranged on the fixed plate through a switch seat, one end of the switch seat is fixedly connected to the fixed plate, and the other end of the switch seat extends to a side close to the movable plate, and the switch seat is arranged on the outer side of the movable plate; a through hole for the limit switch to pass through is arranged on the switch seat, and the limit switch is clamped in the through hole of the switch seat.

5. The lifting chain limiting device according to claim 1, characterized in that: The limiting device also includes an elastic member, one end of which is connected to the fixed plate, and the other end of which is fixedly connected to the movable plate.

6. A chain hoist, characterized in that: The invention comprises a lifting chain and a lifting chain limiting device as claimed in any one of claims 1 to 5.

7. The chain hoist according to claim 6, characterized in that: The chain hoist also includes a chain box for placing the lifting chain, and the limiting device is fixedly arranged at the bottom of the chain box.

8. The chain hoist according to claim 7, characterized in that: The limiting device also includes a mounting plate, one side of which is fixedly connected to the bottom wall of the chain box, and the other side of which is detachably connected to the fixing plate. The bottom wall of the chain box, the mounting plate and the fixing plate are all provided with through holes matching the connecting rod. The connecting rod passes through the fixing plate, the mounting plate and the bottom wall of the chain box in sequence and is connected to the end of the lifting chain.

9. The chain hoist according to claim 6, characterized in that: The chain hoist is used in conjunction with a CNC crane, and a baffle is fixedly installed on the frame of the CNC crane. The baffle is provided with a through hole through which the lifting chain passes, and a block capable of stopping outside the through hole is provided on the lifting chain between the through hole and the limiting device. When the limiting device stops below the chain box, the distance h from the block to the through hole is greater than the stroke when the paddle in the limiting device triggers the limit switch, so as to limit the lifting chain when the limiting device fails.

10. The chain hoist according to claim 9, characterized in that: The limiting device is installed on a side of the baffle plate facing the chain box.

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