A drum device with a novel safety brake

Abstract

This utility model relates to the field of crane technology, specifically a drum device with a novel safety brake. It includes a drum shaft, a drum mounted on the shaft, a brake wheel coaxially fixed to one end of the drum, and a safety brake installed between the brake wheel and the drum shaft. The safety brake includes a lever sleeve keyed to the drum shaft, a ratchet sleeve fitted on the lever sleeve, a brake shoe mounted on the side of the ratchet near the drum, and a lever inside the brake shoe. A ratchet centrifugal wheel is mounted on one side of the ratchet, and a pawl is mounted on the outer ring of the ratchet. A pawl pinion is rotatably connected to the tail end of the pawl. This utility model, through the ingenious design of the ratchet, ratchet centrifugal wheel, pawl, lever, and brake shoe, can quickly brake the drum when the load slides rapidly, effectively preventing accidents. Furthermore, the safety brake does not rely on external power and can still operate normally even in the event of power failure, exhibiting high reliability.

Description

Technical Field

[0001] This utility model relates to the field of crane technology, and in particular to a drum device with a novel safety brake. Background Technology

[0002] As a crucial component of cranes, the winding drum is primarily used for winding and unwinding wire ropes and lifting loads. Its performance directly impacts the crane's operational efficiency and safety. However, traditional winding drums typically employ mechanical or hydraulic brakes as their main braking method. These brakes rely heavily on external power for braking force. If the power system fails, the brakes may malfunction. Furthermore, in emergency situations, traditional brakes have long response times and cannot quickly prevent loads from falling. Therefore, existing technologies still have shortcomings and deficiencies. Utility Model Content

[0003] This invention provides a drum device with a novel safety brake to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a drum device with a novel safety brake, including a drum shaft, a drum mounted on the drum shaft, a brake wheel coaxially fixed at one end of the drum, a safety brake installed between the brake wheel and the drum shaft, the safety brake including a lever sleeve keyed to the drum shaft, a ratchet sleeve fitted on the lever sleeve, a brake shoe mounted on the side of the ratchet near the drum, a lever fixedly connected to the lever sleeve on the inner side of the brake shoe; a ratchet centrifugal wheel mounted on the side of the ratchet away from the drum, a pawl cooperating with the ratchet mounted on the outer ring of the ratchet, and a pawl pinion rotatably connected to the tail end of the pawl cooperating with the ratchet centrifugal wheel.

[0005] Preferably, a friction brake pad is installed on the outer side of the brake shoe.

[0006] Preferably, one end of the brake shoe is hinged to the ratchet via a support pin.

[0007] Preferably, there are two brake shoes, and the two brake shoes are arranged in a mirror image.

[0008] Preferably, a tension spring is provided between the two brake shoes.

[0009] Preferably, a ratchet wear-resistant sleeve is installed between the lever sleeve and the ratchet.

[0010] The beneficial effects of this utility model are as follows: (1) Through the ingenious design of components such as ratchet, ratchet centrifugal wheel, pawl, lever, and brake shoe, when the load slides down rapidly, the ratchet centrifugal wheel pushes the pawl to engage with the ratchet, so that the ratchet and brake shoe stop rotating. In this way, the lever can push the brake shoe to press against the brake wheel, thereby enabling rapid braking of the drum and effectively preventing accidents. Secondly, the safety brake does not rely on external power and can still work normally even when the power fails, thus having high reliability. (2) By setting two mirror-symmetrical brake shoes, the brake shoes can be evenly stressed, thereby improving the stability of the safety brake. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 for Figure 1 Schematic diagram of the structure of section AA in the middle;

[0013] Figure 3 for Figure 1 Schematic diagram of the structure of the middle BB section;

[0014] Figure 4 for Figure 1 Schematic diagram of the structure of the CC section;

[0015] Figure 5 This is a schematic diagram of the structure of this utility model connected to the motor drive.

[0016] Reference numerals in the attached diagram: 1. Drum shaft, 2. Drum, 3. Brake wheel, 4. Safety brake, 41. Lever sleeve, 42. Ratchet, 43. Ratchet wear sleeve, 44. Brake shoe, 45. Lever, 46. Ratchet centrifugal wheel, 47. Pad, 48. Pad bracket, 49. Pad pin, 410. Support pin, 411. Friction brake pad, 412. Tension spring, 5. Reducer, 6. Motor, 7. Motor brake. Detailed Implementation

[0017] The present invention will now be further described with reference to the accompanying drawings.

[0018] like Figure 1-5As shown, this utility model provides a drum device with a novel safety brake, including a drum shaft 1, a drum 2 mounted on the drum shaft 1, a brake wheel 3 coaxially fixed to one end of the drum 2, a safety brake 4 installed between the brake wheel 3 and the drum shaft 1, the safety brake 4 including a lever sleeve 41 keyed to the drum shaft 1, a ratchet 42 sleeved on the lever sleeve 41, a ratchet wear-resistant sleeve 43 installed between the lever sleeve 41 and the ratchet 42, and a brake shoe installed on the side of the ratchet 42 near the drum 2. 44. One end of the brake shoe 44 is hinged to the ratchet 42 via a support pin 410. The inner side of the brake shoe 44 is provided with a lever 45 fixedly connected to the lever sleeve 41. A ratchet centrifugal wheel 46 is installed on the side of the ratchet 42 away from the drum 2. A pawl 47 that cooperates with the ratchet 42 is installed on the outer ring of the ratchet 42. A pawl bracket 48 is provided on the outer ring of the ratchet 42. The pawl 47 is hinged to the pawl bracket 48. The tail end of the pawl 47 is rotatably connected to a pawl pinion 49 that cooperates with the ratchet centrifugal wheel 46.

[0019] Specifically, during use, the drum shaft 1 is connected to the motor 6 via the reducer 5. A motor brake 7 is mounted on the output shaft of the motor 6. When the motor 6 drives the drum 2 to rotate normally via the reducer 5 and the drum shaft 1, the ratchet wear sleeve 43 and the lever sleeve 41 are in static friction contact, meaning they are relatively stationary. At this time, the lever sleeve 41, under the action of static friction, drives the ratchet 42 and the ratchet centrifugal wheel 46 to rotate synchronously. The pawl wheel 49 swings slightly under the rotation of the ratchet centrifugal wheel 46, and the pawl 47 is not engaged with the ratchet 42, so the safety brake 4 is in an untriggered state. When the motor brake 7 fails or an operational error causes the load to drop rapidly, the ratchet brake 7 engages. As the rotational speed of the centrifugal wheel 46 increases, the oscillation amplitude of the pawl wheel 49 increases under the centrifugal force of the ratchet centrifugal wheel 46, causing the pawl 47 to engage with the ratchet wheel 42. The resistance of the pawl 47 to the ratchet wheel 42 is greater than the maximum static friction between the lever sleeve 41 and the ratchet wheel 42. At this time, the ratchet wheel 42 and the brake shoe 44 stop rotating, while the lever 45 continues to rotate with the drum shaft 1. In this way, the lever 45 can push the brake shoe 44 to the outside to press against the brake wheel 3, so that the brake shoe 44 can block the lever 45 and the brake wheel 3, thereby enabling rapid braking of the drum 2. In addition, the safety brake 4 does not rely on external power and can still work normally even when the power fails, thus having high reliability.

[0020] In some embodiments, a friction brake pad 411 is installed on the outer side of the brake shoe 44. Specifically, when the safety brake 4 is applied, the brake shoe 44 presses against the brake wheel 3 through the outer friction brake pad 411, so that the friction brake pad 411 can provide braking friction force, thereby braking the drum 2.

[0021] In some embodiments, there are two brake shoes 44, which are arranged in a mirror image. This allows the brake shoes 44 to be subjected to force evenly, thereby improving the stability of the safety brake 4.

[0022] In some embodiments, a tension spring 412 is provided between the two brake shoes 44, and the brake shoes 44 can be automatically reset by the action of the tension spring 412.

[0023] The above embodiments can be combined with each other.

[0024] The above embodiments are not intended to limit the shape, material, structure, etc. of this utility model in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model shall fall within the protection scope of this utility model.

Claims

1. A drum device with a novel safety brake, comprising a drum shaft on which a drum is mounted, characterized in that: One end of the drum is coaxially fixed with a brake wheel, and a safety brake is installed between the brake wheel and the drum shaft. The safety brake includes a lever sleeve keyed to the drum shaft, a ratchet sleeve is fitted on the lever sleeve, a brake shoe is installed on the side of the ratchet near the drum, and a lever is fixedly connected to the lever sleeve on the inner side of the brake shoe. A ratchet centrifugal wheel is installed on the side of the ratchet away from the drum. A pawl that cooperates with the ratchet is installed on the outer ring of the ratchet. The tail end of the pawl is rotatably connected to a pawl pinion that cooperates with the ratchet centrifugal wheel.

2. The drum device with a novel safety brake according to claim 1, characterized in that: Friction brake pads are installed on the outer side of the brake shoes.

3. A drum device with a novel safety brake according to claim 1, characterized in that: One end of the brake shoe is hinged to the ratchet via a support pin.

4. A drum device with a novel safety brake according to claim 1, characterized in that: There are two brake shoes, which are arranged in a mirror image.

5. A drum device with a novel safety brake according to claim 4, characterized in that: A tension spring is provided between the two brake shoes.

6. A drum device with a novel safety brake according to claim 1, characterized in that: A ratchet wear-resistant sleeve is installed between the lever sleeve and the ratchet.

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