Limiting device of chain block

Abstract

The utility model discloses a chain block limiting device which comprises a chain block body, an equipment box is arranged above the chain block body, a connecting rod is arranged in the equipment box in a limiting mode, the two sides of the connecting rod are each connected with a toothed plate, limiting springs are arranged in the equipment box, and the bottom ends of the two limiting springs are each provided with a connecting block. A plurality of clamping blocks are arranged on the side walls of the connecting blocks at equal intervals, connecting bases are arranged on the bottom wall of the equipment box and located on the outer sides of the two connecting blocks, a plurality of L-shaped clamping grooves connected with the clamping blocks in a limiting and clamping mode are formed in the side walls of the connecting bases at equal intervals, and a plurality of fastening springs are arranged on the inner bottom walls of the connecting bases. The ends, away from the surface of the equipment box, of the multiple fastening springs are jointly connected with an annular check block, the surface of the annular check block is movably connected with the clamping block in an abutting mode, the limiting springs can be rapidly disassembled and replaced through the structure, and therefore the situation that the limiting springs deform after being used for a long time, and use of the device is affected is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of hand chain hoists, in particular to a limiting device for a hand chain hoist. Background Art

[0002] Hand chain hoist, also known as chain hoist, is suitable for short-distance lifting of small equipment and goods. The shell of hand chain hoist is made of high-quality alloy steel, which is strong and wear-resistant, and has high safety performance. Hand chain hoist generally adopts ratchet friction plate one-way brake, which can brake automatically under load. The pawl engages with the ratchet under the action of the spring, making the brake work safely.

[0003] For example, a limiting device for a hand chain hoist is disclosed in the utility model with authorization announcement number CN218931576U, which includes a hand chain hoist body and a connecting rod on its top, a device box is inserted into the top of the connecting rod, a limiting spring is provided in the device box, a tooth plate is provided on the outside of the top of the connecting rod, the tooth plate is engaged with a driven gear, and the driven gear is engaged with a limiting gear. When a heavy object exceeding the load limit is pulled, the limiting spring is deformed, the connecting rod moves downward to drive the tooth plate to move, and the driven gear engaged with the tooth plate rotates with the tooth plate. When the driven gear rotates, it drives the limiting gear to rotate, causing the limiting plate on the outside of the limiting gear to rotate and contact the gear inside the hand chain hoist to prevent the gear from rotating. The limiting plate on the outside of the limiting gear limits the rotation of the gear inside the hand chain hoist, thereby ensuring that the hand chain hoist pulls heavy objects exceeding the load limit and avoiding safety hazards.

[0004] However, the limiting spring has a certain deformation capacity and is prone to deformation during long-term use. In addition, the limiting spring is arranged in the equipment box and is not easy to disassemble and replace. The deformed limiting spring cannot effectively drive the connecting rod to move up and reset. As a result, when pulling some heavy objects that are not overweight, the limiting spring cannot effectively drive the connecting rod to move up and reset, so that the limiting plate to the outside of the limiting gear will still limit the rotation of the gear inside the hand hoist, which ultimately affects the use of the device. Utility Model Content

[0005] In order to overcome the deficiencies of the prior art, the utility model provides a limiting device for a hand chain hoist, which can solve the problem that the limiting spring has a certain deformation ability and is prone to deformation during long-term use. The limiting spring is arranged in the equipment box and is not easy to disassemble and replace. The deformed limiting spring cannot effectively drive the connecting rod to move up and reset, which leads to a technical problem that when some heavy objects that are not overweight are pulled, the limiting spring cannot effectively drive the connecting rod to move up and reset, so that the limiting plate to the outside of the limiting gear will still limit the rotation of the gear inside the hand chain hoist, which ultimately affects the use of the device.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a limiting device for a hand chain hoist, comprising a hand chain hoist main body, a device box is provided above the hand chain hoist main body, a connecting rod is provided for limiting in the device box, a tooth plate is connected on both sides of the connecting rod, a limiting spring is provided in the device box and below the two tooth plates, a connecting block is provided at the bottom end of each of the two limiting springs, a plurality of clamping blocks are provided at equal distances on the side walls of the connecting blocks, a connecting seat is provided on the bottom wall of the device box and located outside the two connecting blocks, a plurality of L-shaped slots that are connected to the clamping block limit are provided at equal distances on the side walls of the connecting seat, a plurality of fastening springs are provided on the inner bottom wall of the connecting seat, and a plurality of fastening springs are connected to a ring-shaped block at one end and the end away from the surface of the device box, and the surface of the ring-shaped block is movably connected to the clamping block.

[0007] As a preferred technical solution of the present invention, a rotating knob for rotating and adjusting the connecting blocks is provided on the surface of the two connecting blocks.

[0008] As a preferred technical solution of the present invention, a driven gear is meshed and connected to the surfaces of the two tooth plates in the device box, and the two driven gears are both connected to the device box in a limited rotation manner.

[0009] As a preferred technical solution of the present invention, a limiting gear is meshed and connected to one side of the two driven gears in the device box, and a limiting plate is connected to the surface of the two limiting gears.

[0010] As a preferred technical solution of the present invention, the bottom end of the connecting rod is connected to the top end of the hand chain hoist body.

[0011] As a preferred technical solution of the present invention, a fixing hook is provided on the top of the device box.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The L-shaped slot is used to lock the locking block, and the locking block is locked. The locking block is locked in the L-shaped slot, and the locking block is locked in the L-shaped slot. The locking block is locked in the L-shaped slot, and the locking block is locked in the L-shaped slot. The stability of the connection between the connecting block and the fastening spring arranged on the connecting block is further improved. The setting of this structure can quickly realize the disassembly and replacement of the limiting spring, thereby avoiding the deformation of the limiting spring caused by long-term use and affecting the use of the device. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0015] Figure 2 This is a schematic diagram of the internal three-dimensional structure of the device box of the utility model;

[0016] Figure 3 This is a schematic diagram of a partially cutaway three-dimensional structure of the utility model;

[0017] Figure 4 This is a schematic diagram of the three-dimensional structure of the local structure of the utility model;

[0018] Among them: 1. Hand chain hoist body; 2. Equipment box; 3. Fixed hook; 4. Connecting rod; 5. Tooth plate; 6. Limiting spring; 7. Connecting seat; 8. L-shaped slot; 9. Fastening spring; 10. Annular block; 11. Block; 12. Connecting block; 13. Rotating knob; 14. Driven gear; 15. Limiting gear; 16. Limiting plate. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific embodiments. However, the following embodiments are only preferred embodiments of the present invention and are not exhaustive. Based on the embodiments in the implementation manner, other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0020] Example

[0021] Please refer to Figure 1-4 As shown, the utility model provides a limiting device for a hand chain hoist, wherein a device box 2 is provided above the hand chain hoist body 1, and then a connecting rod 4 is provided in the device box 2 for limiting the position, and then a tooth plate 5 is connected on both sides of the connecting rod 4, and a limiting spring 6 is provided in the device box 2 and below the two tooth plates 5, and at the same time, a connecting block 12 is provided at the bottom end of the two limiting springs 6, and then a plurality of card blocks 11 are provided at equal distances on the side walls of the connecting block 12, and then a plurality of card blocks 11 are provided on the bottom wall of the device box 2 and outside the two connecting blocks 12. A connecting base 7 is provided, and then a plurality of L-shaped card slots 8 are provided at equal distances on the side wall of the connecting base 7 and are connected to the card block 11. Then, a plurality of fastening springs 9 are provided on the inner bottom wall of the connecting base 7. At the same time, one end of the plurality of fastening springs 9 and the end away from the surface of the device box 2 are commonly connected to an annular stopper 10, and the surface of the annular stopper 10 is movably connected to the card block 11. Finally, a rotating knob 13 is provided on the surface of the two connecting blocks 12. The connecting block 12 can be rotated and adjusted by the setting of the rotating knob 13;

[0022] When the limiting spring 6 is deformed during long-term use and needs to be disassembled and replaced, first adjust and rotate the rotating knob 13, and drive the connecting block 12 and the card block 11 set on the side wall of the connecting block 12 to rotate by rotating the rotating knob 13, and then move the card block 11 out of the L-shaped card slot 8 opened on the side wall of the connecting seat 7, and then use the rotating knob 13 to move the connecting block 12 and the limiting spring 6 to take the limiting spring 6 out of the device box 2, and then replace the new limiting spring 6, and then set the limiting spring 6 in the device box 2 again. At the same time, the card block 11 provided on the side wall of the connecting block 12 is aligned with the L-shaped card slot 8 opened on the side wall of the connecting seat 7, and then the rotating button 13 is pressed to move the card block 11 to the top of the L-shaped card slot 8. Then the card block 11 is rotated in the opposite direction so that the card block 11 is stuck in the end of the L-shaped card slot 8. At the same time, the fastening spring 9 is squeezed to generate elastic force to act on the annular stopper 10. The annular stopper 10 squeezes the card block 11 so that the card block 11 is tightly stuck in the L-shaped card slot 8, further improving the stability of the connection between the card block 11 and the L-shaped card slot 8.

[0023] As a further implementation of this embodiment, Figure 1-4 As shown, at the same time, a driven gear 14 is meshed and connected on the surface of the two tooth plates 5 in the device box 2, and the two driven gears 14 are both limitedly rotated and connected in the device box 2, and then a limiting gear 15 is meshed and connected on one side of the two driven gears 14 in the device box 2, and then a limiting plate 16 is connected to the surface of the two limiting gears 15, and the bottom end of the connecting rod 4 is connected to the top of the hand chain hoist body 1, and finally a fixing hook 3 is provided at the top of the device box 2;

[0024] First, when in use, the hand hoist main body 1 is placed in a suitable built-in position using the fixed hook 3, and then the weight is connected to the hand hoist main body 1. The hand chain is pulled to transmit the gear transmission inside the hand hoist main body 1 to make the weight rise. When the weight exceeds the load limit of the hand hoist main body 1, the limit spring 6 is deformed and compressed, and the connecting rod 4 moves downward. The toothed plates 5 on both sides of the connecting rod 4 follow the movement and drive the driven gear 14 to rotate when moving. When the driven gear 14 rotates, the limit gear 15 is mobilized to rotate. The limit plate 16 on the surface of the limit gear 15 follows the limit gear 15 to rotate and penetrates into the interior of the hand hoist main body 1 when rotating, and contacts the gear structure inside the hand hoist main body 1 to prevent the gear from rotating, so that the hand hoist main body 1 stops pulling the weight upward;

[0025] Specific working principle:

[0026] When the device is in use, the hand hoist body 1 is placed in a suitable built-in position by using the fixed hook 3, and then the weight is connected to the hand hoist body 1. The hand chain is pulled to transmit the gear transmission inside the hand hoist body 1 to make the weight rise. When the weight exceeds the load limit of the hand hoist body 1, the limit spring 6 is deformed and compressed, and the connecting rod 4 moves downward. The toothed plates 5 on both sides of the connecting rod 4 follow the movement and drive the driven gear 14 to rotate when moving. When the driven gear 14 rotates, the limit gear 15 is mobilized to rotate. The limit plate 16 on the surface of the limit gear 15 follows the limit gear 15 to rotate and penetrates into the interior of the hand hoist body 1 when rotating, contacts the gear structure inside the hand hoist body 1, prevents the gear from rotating, and stops the hand hoist body 1 from pulling the weight upward. When the limit spring 6 is deformed during long-term use and needs to be disassembled and replaced, first adjust and rotate the rotating knob 13, and drive the connecting block 12 and the card block 11 set on the side wall of the connecting block 12 to rotate through the rotating knob 13. The locking block 11 is then moved to the top of the L-shaped slot 8, and the locking block 11 is then rotated in the opposite direction so that the locking block 11 is locked into the end of the L-shaped slot 8. At the same time, the fastening spring 9 is squeezed and the elastic force is exerted on the annular stopper 10, and the annular stopper 10 squeezes the locking block 11 so that the locking block 11 is tightly locked into the L-shaped slot 8, further improving the stability of the connection between the locking block 11 and the L-shaped slot 8. The setting of this structure can quickly realize the disassembly and replacement of the limiting spring 6, thereby avoiding the deformation of the limiting spring 6 caused by long-term use and affecting the use of the device.

[0027] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A limiting device for a hand chain hoist, comprising a hand chain hoist body (1), characterized in that: A device box (2) is arranged above the main body (1) of the hand chain hoist, a connecting rod (4) is arranged in a limit position in the device box (2), a tooth plate (5) is connected to both sides of the connecting rod (4), a limiting spring (6) is arranged in the device box (2) and below the two tooth plates (5), a connecting block (12) is arranged at the bottom end of the two limiting springs (6), a plurality of card blocks (11) are arranged at equal distances on the side wall of the connecting block (12), and the bottom of the device box (2) is provided with a plurality of card blocks (11). A connecting seat (7) is disposed on the wall and outside the two connecting blocks (12); a plurality of L-shaped slots (8) are equidistantly disposed on the side wall of the connecting seat (7) and are connected to the clamping block (11) for limiting engagement; a plurality of fastening springs (9) are disposed on the inner bottom wall of the connecting seat (7); one end of the plurality of fastening springs (9) and the end away from the surface of the device box (2) are commonly connected to an annular stopper (10); and the surface of the annular stopper (10) is movably abutted against and connected to the clamping block (11).

2. The limiting device for a hand chain hoist according to claim 1, characterized in that: A rotating knob (13) for rotating and adjusting the connecting block (12) is provided on the surface of each of the two connecting blocks (12).

3. The limiting device for a hand chain hoist according to claim 1, characterized in that: A driven gear (14) is meshedly connected to the surfaces of the two toothed plates (5) in the device box (2), and the two driven gears (14) are both rotationally connected in a limited position in the device box (2).

4. The limiting device for a hand chain hoist according to claim 3, characterized in that: A limiting gear (15) is meshedly connected inside the device box (2) and located on one side of the two driven gears (14), and a limiting plate (16) is connected and arranged on the surface of the two limiting gears (15).

5. The limiting device for a hand chain hoist according to claim 1, characterized in that: The bottom end of the connecting rod (4) is connected to the top end of the hand chain hoist body (1).

6. The limiting device for a hand chain hoist according to claim 1, characterized in that: A fixing hook (3) is arranged on the top of the device box (2).

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