A damping ratchet brake

Abstract

The invention discloses a damping ratchet brake, which belongs to the technical field of winch brakes. It includes a winch connecting flange, a central axis, an inner flange, a bushing, an outer flange, a flat key, a pressure plate, a ratchet, a positioning shaft, a brake compression spring, a pawl, a guide shaft, and a limit travel switch; one side of the winch connecting flange is connected to the main shaft of the winch, and the other side is fixed to the central axis; the inner flange, bushing, and outer flange are fixed to the central axis in sequence through a flat key, and the pressure plate is fixed to the end of the central axis to press the inner flange, bushing, and outer flange; the ratchet sleeve is freely rotated on the bushing. When the ratchet speed exceeds the set safety range, the impact pawl is clamped into the ratchet, and the limit travel switch is triggered at the same time to disconnect the power supply of the winch. The power off and braking are carried out simultaneously, which is rapid and effective. The braking effect of the brake compression spring is moderate and effective, and the impact resistance is good; the strong magnet can be adsorbed on the outer edge of the ratchet in time, which improves the reliability of the pawl clamping into the ratchet.

Description

Technical Field

[0001] The invention relates to a damping ratchet brake, belonging to the technical field of winch brakes. Background Art

[0002] A winch is a light and small lifting equipment that uses a drum to wind a wire rope or chain to lift or pull heavy objects, also known as a winch. The winch can lift vertically, horizontally or tilt the heavy objects. The winch is divided into three types: manual winch, electric winch and hydraulic winch. It can be used alone or as a component of machinery such as lifting, road construction and mine hoisting. It is widely used because of its simple operation, large rope winding volume and convenient relocation. It is mainly used for material lifting or flat dragging in construction, water conservancy projects, forestry, mining, docks, etc. With the development of the domestic economy, people have higher requirements for the safety and comfort of the operation of lifting equipment. The braking method of the winch of domestic cranes is basically a brake block brake or an electromagnetic brake. These old-fashioned brake mechanisms have the following problems: large space size, large impact force during braking, poor operating comfort, easy failure and other problems. Therefore, a damping ratchet brake is designed, which has a compact structure, good impact resistance, and a relatively smooth braking process. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a damping ratchet brake, which solves the problems of large space size, large impact force during braking and poor operating comfort of the current winch brake.

[0004] The technical problem to be solved by the present invention is achieved by adopting the following technical solutions:

[0005] A damping ratchet brake comprises a winch connecting flange, a middle shaft, an inner flange, a bushing, an outer flange, a flat key, a pressure plate, a ratchet, a positioning shaft, a brake compression spring, a ratchet pawl, a guide shaft, and a limit travel switch;

[0006] One side of the winch connection flange is connected to the winch main shaft, and the other side is fixed to the central shaft;

[0007] The inner flange, bushing and outer flange are fixed on the central shaft in sequence through flat keys, and a pressure plate is fixed on the end of the central shaft to press the inner flange, bushing and outer flange tightly; the ratchet is sleeved on the bushing and rotates freely;

[0008] A brake compression spring is fixed on the ratchet through a positioning shaft, and openings corresponding to the brake compression springs are provided on the inner flange and the outer flange. Both sides of the brake compression spring are located in the openings of the inner flange and the outer flange respectively, and the ratchet is connected to the inner flange and the outer flange through the brake compression spring and rotates synchronously;

[0009] The pawl is movably fixed under the ratchet through a guide shaft, a swing ring is provided at one end of the pawl, and a ratchet is provided at the other end. The center of gravity of the pawl deviates from the center of the guide shaft and is close to the ratchet end. The ratchet end naturally droops, and the swing ring end contacts the outer edge of the ratchet. A limit travel switch for controlling the start and stop of the winch is provided under the pawl. When the ratchet end of the pawl rotates and engages in the ratchet, the swing ring end touches the limit travel switch to stop the winch.

[0010] As a preferred example, four brake compression springs are fixed on the ratchet.

[0011] As a preferred example, the outer edge of the ratchet wheel is provided with four gear teeth.

[0012] As a preferred example, the center axis direction of the brake compression spring is the tangent direction of the ratchet rotation circle.

[0013] As a preferred example, a strong magnet is provided at the end of the ratchet.

[0014] As a preferred example, the surface where the strong magnet contacts the outer edge of the ratchet is a matching arc-shaped curved surface.

[0015] Working principle: Under normal speed of the ratchet, the ratchet tooth end droops naturally, and the swing ring end contacts the outer edge of the ratchet. The pawl is impacted by the teeth on the outer edge of the ratchet and jumps slightly, without triggering the limit travel switch, and the winch works normally. According to the law of momentum, the higher the speed of the ratchet, the greater the impact force on the pawl. When the speed of the ratchet exceeds the set safety range, the swing ring end of the pawl is strongly impacted and rotates, and the ratchet tooth end contacts and adsorbs the outer edge of the ratchet through a strong magnet, and is stuck in the teeth of the ratchet. The ratchet stops rotating, and the brake compression spring produces a mild braking force on the inner flange and the outer flange to stop the rotation of the winch main shaft. At the same time, the swing ring end touches the limit travel switch, disconnects the power supply of the winch, and stops the winch.

[0016] The beneficial effects of the present invention are as follows: when the ratchet rotation speed exceeds the set safety range, the impact pawl is engaged with the ratchet, and the limit travel switch is triggered at the same time, the power supply of the winch is disconnected, and the power off and braking are carried out simultaneously, which is rapid and effective. The braking effect of the brake compression spring is moderate and effective, and the impact resistance is good; the strong magnet can be adsorbed on the outer edge of the ratchet in time, thereby improving the reliability of the pawl being engaged with the ratchet; it has a simple and compact structure, high safety and reliability, and greatly improves the safety of equipment and personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a cross-sectional view of the ratchet structure of the present invention;

[0018] Figure 2 It is a structural schematic diagram of the present invention when the winch is working at normal speed;

[0019] Figure 3It is a structural schematic diagram of the present invention for emergency braking after the winch is overspeeded.

[0020] In the figure: winch connecting flange 1, central shaft 2, inner flange 3, bushing 4, outer flange 5, flat key 6, pressure plate 7, ratchet 8, positioning shaft 9, brake compression spring 10, pawl 11, guide shaft 12, limit travel switch 13, winch main shaft 14, opening 15, swing ring 16, ratchet 17, strong magnet 18. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0022] As 1- Figure 3 As shown, a damping ratchet brake comprises a winch connecting flange 1, a middle shaft 2, an inner flange 3, a bushing 4, an outer flange 5, a flat key 6, a pressure plate 7, a ratchet 8, a positioning shaft 9, a brake compression spring 10, a ratchet pawl 11, a guide shaft 12, and a limit travel switch 13;

[0023] One side of the winch connection flange 1 is connected to the winch main shaft 14, and the other side is fixed to the central shaft 2;

[0024] The inner flange 3, the bushing 4, and the outer flange 5 are fixed to the central axis 2 in sequence through the flat key 6, and the pressure plate 7 is fixed to the end of the central axis 2 to press the inner flange 3, the bushing 4, and the outer flange 5; the ratchet 8 is sleeved on the bushing 4 and rotates freely;

[0025] A brake compression spring 10 is fixed to the ratchet 8 via a positioning shaft 9, and openings 15 corresponding to the brake compression spring 10 are provided on the inner flange 3 and the outer flange 5. Both sides of the brake compression spring 10 are located in the openings 15 of the inner flange 3 and the outer flange 5, respectively. The ratchet 8 is connected to the inner flange 3 and the outer flange 5 via the brake compression spring 10 and rotates synchronously;

[0026] The pawl 11 is movably fixed under the ratchet 8 through the guide shaft 12. A swing ring 16 is provided at one end of the pawl 11, and a ratchet 17 is provided at the other end. The center of gravity of the pawl 11 deviates from the center of the guide shaft 12 and is close to the end of the ratchet 17. The end of the ratchet 17 naturally droops, and the end of the swing ring 16 contacts the outer edge of the ratchet 8. A limit travel switch 13 for controlling the start and stop of the winch is provided under the pawl 11. When the ratchet 17 end of the pawl 11 rotates and is engaged in the ratchet 8, the end of the swing ring 16 touches the limit travel switch 13 to stop the winch.

[0027] Four brake compression springs 10 are fixed on the ratchet 8. Four gear teeth are arranged on the outer edge of the ratchet 8. The center axis direction of the brake compression spring 10 is the tangent direction of the rotation circle of the ratchet 8.

[0028] A strong magnet 18 is provided at the end of the ratchet tooth 17, and the surface where the strong magnet 18 contacts the outer edge of the ratchet wheel 8 is a matching arc-shaped curved surface.

[0029] Working principle: When the ratchet 8 rotates at a normal speed, the end of the ratchet tooth 17 droops naturally, the end of the swing ring 16 contacts the outer edge of the ratchet 8, and the pawl 11 is impacted by the teeth on the outer edge of the ratchet 8 and jumps slightly, without triggering the limit travel switch 13, and the winch works normally; according to the law of momentum, the higher the speed of the ratchet 8, the greater the impact force on the pawl 11. When the speed of the ratchet 8 exceeds the set safety range, the swing ring 16 end of the pawl 11 rotates under the strong impact, and the end of the ratchet tooth 17 contacts and adsorbs the outer edge of the ratchet 8 through the strong magnet 18, and is stuck in the teeth of the ratchet 8, the ratchet 8 stops rotating, and the brake compression spring 10 generates a mild braking force on the inner flange 3 and the outer flange 5, stopping the rotation of the winch main shaft 14. At the same time, the swing ring 16 end touches the limit travel switch 13, disconnects the power supply of the winch, and stops the winch from working. This avoids rigid braking, which greatly reduces the braking impact force, allowing the brake to work stably and reliably for a long time, greatly improving production efficiency, reducing operating and maintenance costs, and ensuring equipment and personal safety.

[0030] When the rotation speed of the ratchet 8 exceeds the set safety range, the impact pawl 11 is engaged with the ratchet 8, and the limit travel switch 13 is triggered at the same time, disconnecting the power supply of the winch. The power off and braking are carried out simultaneously, quickly and effectively. The braking effect of the brake compression spring 10 is moderate and effective, and has good impact resistance. The strong magnet 18 can be adsorbed on the outer edge of the ratchet 8 in time, which improves the reliability of the pawl 11 being engaged with the ratchet 8. It has a simple and compact structure, high safety and reliability, and greatly improves the safety of equipment and personnel.

[0031] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A damping ratchet brake, characterized in that: It includes a winch connecting flange, a center shaft, an inner flange, a bushing, an outer flange, a flat key, a pressure plate, a ratchet, a positioning shaft, a brake compression spring, a ratchet, a guide shaft, and a limit travel switch; One side of the winch connection flange is connected to the winch main shaft, and the other side is fixed to the central shaft; The inner flange, bushing and outer flange are fixed on the central shaft in sequence through flat keys, and a pressure plate is fixed on the end of the central shaft to press the inner flange, bushing and outer flange tightly; the ratchet is sleeved on the bushing and rotates freely; A brake compression spring is fixed on the ratchet through a positioning shaft, and openings corresponding to the brake compression springs are provided on the inner flange and the outer flange. Both sides of the brake compression spring are located in the openings of the inner flange and the outer flange respectively, and the ratchet is connected to the inner flange and the outer flange through the brake compression spring and rotates synchronously; The pawl is movably fixed under the ratchet through a guide shaft, a swing ring is provided at one end of the pawl, and a ratchet is provided at the other end. The center of gravity of the pawl deviates from the center of the guide shaft and is close to the ratchet end. The ratchet end naturally droops, and the swing ring end contacts the outer edge of the ratchet. A limit travel switch for controlling the start and stop of the winch is provided under the pawl. When the ratchet end of the pawl rotates and engages in the ratchet, the swing ring end touches the limit travel switch to stop the winch.

2. A damping ratchet brake according to claim 1, characterized in that: Four brake compression springs are fixed on the ratchet.

3. A damping ratchet brake according to claim 1, characterized in that: The outer edge of the ratchet is provided with four gear teeth.

4. A damping ratchet brake according to claim 1, characterized in that: The center axis direction of the brake compression spring is the tangent direction of the ratchet rotation circle.

5. A damping ratchet brake according to claim 1, characterized in that: A strong magnet is provided at the end of the ratchet.

6. A damping ratchet brake according to claim 5, characterized in that: The surface where the strong magnet contacts the outer edge of the ratchet is a matching arc-shaped curved surface.

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