Brake device suitable for portable lifter

Abstract

The brake device is mounted on a rear end cover at the tail of a driving motor, a mounting disc, a brake disc and a spring chassis are sequentially arranged on the rear end cover, a handle is arranged on the outer side of the spring chassis, and a one-way clutch rotating mechanism, a friction disc and a lifting disc are sequentially arranged between the mounting disc and the brake disc. A motor transmission shaft penetrates through the installation disc to be connected with the clutch rotating mechanism. The one-way clutch rotating mechanism for limiting one-way rotation of the motor transmission shaft is arranged inside, the motor transmission shaft is prevented from rotating when rotating reversely, electric drive is not needed, and braking can be completed by means of the gravity of equipment and loads. The brake device is further provided with a handle, when the motor transmission shaft needs to rotate reversely, only the handle needs to be pulled to rotate in the radial direction, so that the friction disc and the one-way clutch rotating mechanism are longitudinally separated, the limiting disc is gradually released, the friction disc and the rotating disc can rotate reversely together under driving of the motor transmission shaft, and the brake device has the advantages of being convenient to operate and safe to operate.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and particularly relates to a braking device suitable for a portable lifter. Background Art

[0002] At present, in the fields of high-altitude operation maintenance, high-rise building flaw detection and maintenance, fire emergency rescue, and high-altitude material transportation, small electric portable lifters are gradually used to lift personnel or items. Such portable lifters can lift personnel or items to freely ascend and descend along a rope. Most of the internal parts of the portable lifter are driven by a motor. In order to ensure the safety of the users, the motor driving the lifter must be equipped with a reliable braking device. Most of the motors of the existing portable lifters use electromagnetic brakes. However, during the use of the electromagnetic brakes, not only will a part of the battery power be consumed, shortening the service time of the portable lifter, but also electrical faults such as voltage fluctuations and coil burnout may occur, affecting the braking effect. Summary of the Utility Model

[0003] To solve the technical problems mentioned in the background art, the utility model provides a braking device suitable for a portable lifter.

[0004] The utility model adopts the following technical scheme: A braking device suitable for a portable lifter is installed on the rear end cover of the tail of the driving motor. It is characterized in that an installation disc, a braking disc, and a spring chassis are sequentially arranged on the rear end cover; a handle is arranged on the outer disc surface of the spring chassis; a one-way clutch rotating mechanism, a friction disc, and a lifting disc are sequentially arranged between the installation disc and the braking disc; the motor drive shaft passes through the installation disc and is fixedly connected to the clutch rotating mechanism;

[0005] A plurality of return springs are arranged in the inner groove of the spring chassis; the plurality of return springs are arranged between the spring chassis and the braking disc and abut against the surface of the friction disc;

[0006] The friction disc is in a regular polygon shape and is embedded in the first installation hole in the center inside of the braking disc; the hole shape of the first installation hole is adapted to the friction disc, so that the friction disc cannot rotate along the inner side of the first installation hole;

[0007] The one-way clutch rotating mechanism is embedded in the second circular installation hole in the center inside of the braking disc; the friction disc abuts against the surface of the one-way clutch rotating mechanism to make it unable to rotate freely;

[0008] The lifting disc is embedded at one end of the friction disc close to the one-way clutch rotating mechanism; a lifting shaft is arranged at the top of the lifting disc; the lifting shaft sequentially passes through the friction disc and the spring chassis and is fixedly connected to the handle;

[0009] By lifting the handle upwards, the friction disc is longitudinally separated from the one-way clutch rotating mechanism;

[0010] The one-way clutch rotating mechanism includes a limit disk abutting against the friction disk; an anti-wear ball disk and a rotating disk are arranged in the central hole of the limit disk;

[0011] A rolling groove for accommodating the rolling of the anti-wear ball disk is arranged on the contact surface between the limit disk and the rotating disk;

[0012] The inner circle of the central hole of the limit disk has an inner surface with multiple continuous arc-shaped slope profiles; the multiple continuous arc-shaped slopes are sequentially connected and form a stop surface protruding the slope surface at the junction;

[0013] A radial through hole passing through the center of the circle is opened on the outer circle of the rotating disk; an elastic retaining pin assembly is installed in the radial through hole;

[0014] The elastic retaining pin assembly includes a central spring and rotors arranged at both ends of the central spring; the rotors at both ends are extruded by the elastic force of the central spring to extend out of the radial through hole and abut against the inner circle of the central hole;

[0015] When the motor drive shaft rotates forward, the rotors at both ends can freely slide on the slope surfaces of the multiple continuous arc-shaped slopes, thereby completing one-way continuous rotation;

[0016] When the motor drive shaft rotates reversely, the rotors at both ends stop sliding when they rotate to the stop surface.

[0017] Further, the mounting disk, the brake disk and the spring chassis are fixed to the rear end cover by hollow bolts and socket head cap screws matching with the hollow bolts.

[0018] Further, a connecting seat is arranged at one end of the rotating disk close to the mounting disk; the connecting seat is inserted into the central hole of the mounting disk; a connecting hole for connecting the motor drive shaft is arranged at the top end of the connecting seat.

[0019] Further, a ball detent is arranged on the outer circle of the connecting seat for clamping the motor drive shaft.

[0020] Further, a rotating guide rail in the shape of a slope is arranged on the outer side disk surface of the spring chassis; the protrusion at the end of the handle can slide along the rotating guide rail to control the height of the handle for lifting the lifting disk.

[0021] Compared with the prior art, the advantages of the present utility model are as follows: The braking device applicable to the portable lifter designed by the present utility model prevents the rotation of the motor drive shaft in the reverse direction by arranging a one-way clutch rotating mechanism for restricting the one-way rotation of the motor drive shaft inside. Without power drive, braking can be completed relying on the gravity of the equipment and the load itself. At the same time, the braking device is also equipped with a handle. When the motor drive shaft needs to rotate in the reverse direction, just pull the handle radially to rotate, so that the friction disc is longitudinally separated from the one-way clutch rotating mechanism, and the limit disc is gradually released, and it can rotate reversely together with the rotating disc under the drive of the motor drive shaft, which has the advantages of convenient operation and safe operation. Description of the Drawings

[0022] Figure 1 It is a schematic diagram of the overall structure of the braking device applicable to the portable lifter of the present utility model;

[0023] Figure 2 It is an exploded view of the braking device applicable to the portable lifter of the present utility model;

[0024] Figure 3 It is an exploded view of the one-way clutch rotating mechanism of the present utility model;

[0025] Figure 4 It is a schematic plan view of the one-way clutch rotating mechanism of the present utility model;

[0026] Figure 5 It is a schematic diagram of a partial structure of the braking device applicable to the portable lifter of the present utility model.

[0027] Wherein:

[0028] 1 - mounting disc, 2 - brake disc, 3 - spring chassis, 4 - handle, 5 - one-way clutch rotating mechanism, 6 - friction disc, 7 - lifting disc, 8 - return spring, 9 - lifting shaft,

[0029] 31 - rotating guide rail, 41 - protrusion,

[0030] 50 - ball set screw, 51 - limit disc, 52 - anti-wear ball disc, 53 - rotating disc, 54 - inclined plane, 55 - stop surface, 56 - radial through hole, 57 - central spring, 58 - rotor, 59 - connecting seat. Detailed Embodiment

[0031] Hereinafter, for the convenience of those skilled in the art to understand the technical solution of the present utility model, further description will be made with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present utility model.

[0032] In the following detailed description, for the sake of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present utility model. However, it is obvious that one or more embodiments can also be implemented without these specific details. In addition, in the following description, the descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present utility model.

[0033] As Figure 1-2 shown, the present utility model is applicable to the braking device of a portable lifter, which is installed on the rear end cover of the tail of a driving motor and includes a mounting disc 1, a braking disc 2 and a spring chassis 3. A handle 4 is arranged on the outer disc surface of the spring chassis 3. During specific implementation, the mounting disc 1, the braking disc 2 and the spring chassis 3 can be fixed to the rear end cover through hollow bolts and cylinder head screws that cooperate with the hollow bolts. A one-way clutch rotating mechanism 5, a friction disc 6 and a lifting disc 7 are sequentially arranged between the mounting disc 1 and the braking disc 2. The motor transmission shaft passes through the mounting disc 1 and is fixedly connected to the one-way clutch rotating mechanism 5. A plurality of return springs 8 are arranged in the inner groove of the spring chassis 3, and the plurality of return springs 8 are arranged between the spring chassis 3 and the braking disc 2 and abut against the surface of the friction disc 6.

[0034] In this embodiment, the friction disc 6 is in the shape of a regular polygon and is embedded in the first mounting hole inside the center of the braking disc 2. In the figure, a regular hexagon is taken as an example. The shape of the first mounting hole is adapted to the friction disc 6 so that the friction disc 6 cannot rotate along the inner side of the first mounting hole. The one-way clutch rotating mechanism 5 is embedded in the second circular mounting hole inside the center of the braking disc 2, and the friction disc 6 abuts against the surface of the one-way clutch rotating mechanism 5 to prevent it from rotating freely. The lifting disc 7 is embedded at one end of the friction disc 6 close to the one-way clutch rotating mechanism 5. A lifting shaft 9 is arranged at the top of the lifting disc 7. The lifting shaft 9 sequentially passes through the friction disc 6 and the spring chassis 3 and is fixedly connected to the handle 4. By lifting the handle 4 upwards to lift the lifting disc 7, the friction disc 6 is longitudinally separated from the one-way clutch rotating mechanism 5, and further, the whole one-way clutch rotating mechanism 5 can rotate in the reverse direction of the motor transmission shaft.

[0035] As Figure 3 shown, it is an exploded view of the one-way clutch rotating mechanism of the present utility model. The one-way clutch rotating mechanism 5 includes a limit disc 51 that abuts against the friction disc 6. An anti-wear ball disc 52 and a rotating disc 53 are arranged in the central hole of the limit disc 51. In order to prevent the forward rotation of the motor transmission shaft from being affected by the large frictional force between the rotating disc and the limit disc, therefore, in this embodiment, an anti-wear ball disc 52 is arranged between the rotating disc and the limit disc. At the same time, a rolling groove for accommodating the rolling of the anti-wear ball disc 52 is arranged on the contact surface between the limit disc 51 and the rotating disc 53, which can greatly reduce the influence of the frictional force between the rotating disc and the limit disc.

[0036] Please continue to refer to Figure 2, in this embodiment, a connecting seat 59 is provided at one end of the rotating disk 53 close to the mounting disk 1, and the connecting seat 59 is inserted into the central hole of the mounting disk 1; a connecting hole for connecting the motor drive shaft is provided at the top of the connecting seat 59, and a ball detent 50 for clamping the motor drive shaft is provided on the outer circle of the connecting seat 59.

[0037] As Figure 4 shown, in this embodiment, the inner circle of the central hole of the limit disk 51 has an inner surface with a plurality of continuous arc-shaped ramp profiles. The plurality of continuous arc-shaped ramps are connected in sequence and form a stop surface 55 that protrudes the ramp surface 54 at the junction. A radial through hole 56 passing through the center of the circle is opened on the outer circle of the rotating disk 53, and an elastic detent assembly is installed in the radial through hole 56. The elastic detent assembly includes a central spring 57 and rotors 58 provided at both ends of the central spring 57. Since the central spring 57 is always in a compressed state, the two movable rotors 58 are always extruded by an elastic force along the axial direction and protrude out of the radial through hole 56 and abut against the inner circle of the central hole of the limit disk 51. When the motor drive shaft rotates forward, the tops of the movable rotors 58 inside the rotating disk always fit against the inner wall of the central hole of the limit disk. The rotors 58 at both ends can freely slide on the ramp surface 54 of the plurality of continuous arc-shaped ramps, thereby enabling the rotating disk 53 to complete a one-way continuous rotation. When the motor drive shaft rotates reversely, the rotors 58 at both ends stop sliding when they reach the stop surface 55.

[0038] That is, when the portable hoist needs to hover or accidentally descend, the hoist drives the motor drive shaft to rotate reversely due to the gravity of itself and the load. The rotating disk 53 will also rotate reversely with the motor drive shaft. When the rotating disk 53 rotates a certain angle, the movable rotor 58 will be stuck on the stop surface 55 of the inner wall of the limit disk. At this time, since the limit disk 51 of the one-way clutch is restricted from rotating by the friction disk 6, the motor drive shaft will also stop rotating, and the torque will be transmitted to the outside of the portable hoist through the reducer, so that the hoist cannot descend.

[0039] As Figure 5 shown, in this embodiment, a rotating guide rail 31 in the shape of a ramp is provided on the outer disk surface of the spring chassis 3, and the protrusion 41 at the end of the handle 4 can slide along the rotating guide rail 31 to control the height of the handle 4 for lifting the lifting disk 7.

[0040] When the portable hoist needs to perform a descending operation, the rotating disk also needs to rotate reversely with the motor drive shaft. Since the rotating disk 53 is limited to rotate forward by the limit disk 51 at this time, the limit disk 51 and the rotating disk 53 need to rotate reversely together. In this embodiment, the mutual force between the friction disk 6 and the limit disk 51 is reduced to achieve the above-mentioned purpose of common rotation.

[0041] As Figure 5As shown in the figure, by rotating the handle, the protrusion at the end of the handle slides along the ramp-shaped rotating guide rail 31. The handle is connected to the lifting shaft 9 and drives the lifting shaft 9 to move upward along the axis. At this time, the elastic force received by the friction disk 6 gradually decreases as the rotation amplitude of the handle increases. When the force received by the limit disk 51 decreases to the critical value, the limit disk 51 begins to rotate in reverse together with the rotating disk 53, and as the rotation amplitude of the handle continues to increase, the rotation speeds of the rotating disk 53 and the limit disk 51 will also increase accordingly.

[0042] In summary, the braking device designed for the portable lifter of the present invention prevents the motor drive shaft from rotating when it rotates in reverse by setting a one-way clutch rotating mechanism that restricts the one-way rotation of the motor drive shaft inside, without the need for electric drive, and the braking can be completed relying on the gravity of the equipment and the load itself. At the same time, the braking device is also equipped with a handle. When the motor drive shaft needs to rotate in reverse, just pull and rotate the handle radially to longitudinally separate the friction disk from the one-way clutch rotating mechanism, and the limit disk is gradually released, and it can rotate in reverse together with the rotating disk under the drive of the motor drive shaft, which has the advantages of convenient and safe operation.

[0043] The above embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention should fall within the protection scope determined by the claims of the present invention.

Claims

1. A braking device applicable to a portable lifter, which is installed on the rear end cover of the tail of a driving motor, and is characterized in that, An installation disk (1), a brake disk (2) and a spring chassis (3) are successively arranged on the rear end cover; a handle (4) is arranged on the outer disk surface of the spring chassis (3); a one-way clutch rotating mechanism (5), a friction disk (6) and a lifting disk (7) are successively arranged between the installation disk (1) and the brake disk (2); the motor transmission shaft passes through the installation disk (1) and is fixedly connected with the one-way clutch rotating mechanism (5); A plurality of return springs (8) are arranged in the inner groove of the spring chassis (3); the plurality of return springs (8) are arranged between the spring chassis (3) and the brake disk (2) and abut against the surface of the friction disk (6); The friction disk (6) is in a regular polygon shape and is embedded in a first installation hole on the inner side of the center of the brake disk (2); the hole shape of the first installation hole is adapted to the friction disk (6) so that the friction disk (6) cannot rotate along the inner side of the first installation hole; The one-way clutch rotating mechanism (5) is embedded in a second circular installation hole on the inner side of the center of the brake disk (2); the friction disk (6) abuts against the surface of the one-way clutch rotating mechanism (5) to make it unable to rotate freely; The lifting disk (7) is embedded at one end of the friction disk (6) close to the one-way clutch rotating mechanism (5); a lifting shaft (9) is arranged at the top of the lifting disk (7); the lifting shaft (9) successively passes through the friction disk (6) and the spring chassis (3) and is fixedly connected with the handle (4); The handle (4) lifts the lifting disk (7) upward to longitudinally separate the friction disk (6) from the one-way clutch rotating mechanism (5); The one-way clutch rotating mechanism (5) includes a limiting disk (51) abutting against the friction disk (6); an anti-wear ball disk (52) and a rotating disk (53) are arranged in the central hole of the limiting disk (51); A rolling groove for accommodating the rolling of the anti-wear ball disk (52) is arranged on the contact surface between the limiting disk (51) and the rotating disk (53); The inner circle of the central hole of the limiting disk (51) has an inner surface with a plurality of continuous arc-shaped slope profiles; the plurality of continuous arcs are successively connected and form a stop surface (55) with a protruding slope surface (54) at the junction; A radial through hole (56) passing through the center of the circle is opened on the outer circle of the rotating disk (53); an elastic pin assembly is installed in the radial through hole (56); The elastic pin assembly includes a central spring (57) and rotors (58) arranged at both ends of the central spring (57); the rotors (58) at both ends are extruded by the elastic force of the central spring (57) to extend out of the radial through hole (56) and abut against the inner circle of the central hole of the limiting disk (51); When the motor transmission shaft rotates forward, the rotors (58) at both ends can freely slide on the slope surfaces (54) of the plurality of continuous arc-shaped slopes, thereby completing one-way continuous rotation; When the motor transmission shaft rotates reversely, the rotors (58) at both ends stop sliding when turning to the stop surface (55).

2. The braking device applicable to a portable hoist according to claim 1, characterized in that, The installation disk (1), the brake disk (2) and the spring chassis (3) are fixed to the rear end cover by hollow bolts and cylinder head screws matching with the hollow bolts.

3. The braking device applicable to the portable lifter according to claim 2, characterized in that, A connecting seat (59) is arranged at one end of the rotating disk (53) close to the mounting disk (1); the connecting seat (59) is inserted into the central hole of the mounting disk (1); a connecting hole for connecting the motor transmission shaft is arranged at the top end of the connecting seat (59).

4. The braking device applicable to a portable lifter according to claim 3, characterized in that, A ball detent screw (50) for clamping the motor transmission shaft is arranged on the outer circumference of the connecting seat (59).

5. The braking device applicable to the portable lifter according to claim 4, characterized in that, A rotating guide rail (31) in a slope shape is arranged on the outer side disk surface of the spring chassis (3); the protrusion (41) at the end of the handle (4) can slide along the rotating guide rail (31) to control the height of the handle (4) for lifting the lifting disk (7).

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