A kind of stepless automatic locking telescopic mechanism applied to sling

Abstract

The utility model discloses a telescopic mechanism of stepless automatic locking applied to the lifting appliance belongs to hoisting machinery technical field. The mechanism includes fixed beam, movable beam, motor speed reducer, rigid coupling, bearing seat, screw rod, nut, nut seat and running wheel. Movable beam is installed in the inside of fixed beam, and screw rod is connected through the thread with nut, and motor speed reducer drives screw rod rotation, and the linear motion of screw rod drives movable beam to retract relative to fixed beam. After retracting in place, through the thread engagement of screw rod and nut and specific structural design, realize the automatic locking of mechanism, prevent retracting beam accidental breakaway. The mechanism need not bolt, can realize stepless adjustment telescopic length, and in the locking state, movable beam and fixed beam will not produce the loosening between, has simple structure, locking reliable, convenient operation, the advantage such as positioning accurate.

Description

Technical Field

[0001] This utility model relates to the field of crane equipment technology, specifically to a telescopic mechanism for lifting devices that can be automatically locked steplessly. Background Technology

[0002] Traditional telescopic spreading harnesses typically use a drive sprocket and chain to achieve their extension and retraction function. Once extended to the desired position, a pin needs to be manually inserted to connect the movable beam to the fixed beam to prevent accidental detachment during use. This structure has the following drawbacks: Gear limitations: The connection method of sprockets, chains and pins means that the telescopic length can only be preset to a few fixed gears, and stepless adjustment is not possible, resulting in poor flexibility.

[0003] Cumbersome operation: After the extension and retraction are in place, manual operation of the pin is required, which increases the operation steps and labor intensity, and poses certain safety hazards when operating in harsh environments.

[0004] Locking reliability: The locking effect of the pin may be affected by factors such as wear and vibration, and its reliability needs to be improved.

[0005] Therefore, it is necessary to develop a telescopic mechanism that can achieve stepless adjustment of telescopic length and automatically lock after telescopic extension without additional manual intervention, in order to overcome the shortcomings of existing technologies. Utility Model Content

[0006] Purpose of the utility model: In view of the shortcomings of the prior art, this utility model provides a telescopic mechanism for lifting devices that can be automatically locked steplessly. This mechanism can achieve stepless adjustment of the telescopic position and can automatically lock after telescopic positioning. It does not require a pin connection and has the characteristics of simple structure, reliable locking and convenient operation.

[0007] To achieve the above objectives, this utility model provides the following technical solution: This utility model discloses a telescopic mechanism for lifting devices that can be automatically locked steplessly, comprising: Fixed beam: As the reference component of the mechanism, it bears part of the fixed load.

[0008] Movable beam: Installed inside the fixed beam to enable telescopic movement.

[0009] Motor reducer: Fixed on the movable beam, it provides power to drive the lead screw to rotate.

[0010] Rigid couplings are used to transmit the power output from the motor reducer to the lead screw and can withstand a certain axial force.

[0011] Bearing housing: Fixed on the movable beam, used to support the rotating part of the lead screw and bear the tension during the extension and retraction of the mechanism.

[0012] Lead screw: It engages with a nut through a thread. When the motor and reducer drive the lead screw to rotate, the lead screw moves linearly relative to the nut, thereby driving the movable beam connected to the lead screw to extend and retract linearly.

[0013] Nut: It is installed on the nut seat by engaging with the lead screw through threads.

[0014] Nut seat: Fixed to the fixed beam, it supports the nut and secures it to the fixed beam.

[0015] Traveling wheels: Installed at the tail of the lead screw, used to limit the linear movement of the lead screw inside the fixed beam and prevent it from swaying.

[0016] Furthermore, when the lead screw rotates, it moves linearly relative to the nut fixed on the fixed beam through thread engagement, thereby driving the movable beam connected to the lead screw to extend and retract linearly relative to the fixed beam.

[0017] The traveling wheel includes a second bearing seat, a traveling bracket, and a roller. The second bearing seat is mounted on the traveling bracket, the roller is mounted on the traveling bracket, and the traveling wheel is mounted as a whole on the tail of the lead screw. The roller restricts the lead screw inside the fixed beam.

[0018] The roller restricts the screw from swinging up, down, left, and right within the fixed beam.

[0019] Compared with the prior art, the beneficial effects of this utility model are: By precisely controlling the rotation of the motor reducer, the movable beam can be extended or retracted to any length relative to the fixed beam, overcoming the gear limitations of traditional sprocket, chain, and pin structures and improving operational flexibility. Once fully extended, the mechanism automatically locks itself through the threaded engagement of the lead screw and nut, as well as the overall structural design, eliminating the need for manual pin insertion and significantly improving operational efficiency and convenience. The threaded locking principle means that the locking force increases under tension, making loosening less likely. Simultaneously, the bearing housing also bears some of the tension, further enhancing the reliability of the locking mechanism. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0021] Figure 2 This is a cross-sectional view of the present invention.

[0022] In the diagram: 1. Fixed beam; 2. Movable beam; 3. Motor reducer; 4. Rigid coupling; 5. Bearing housing; 6. Lead screw; 7. Nut; 8. Nut seat; 9. Traveling wheel; 91. Second bearing housing; 92. Traveling bracket; 93. Roller. Detailed Implementation

[0023] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0024] like Figure 1-2 The telescopic mechanism shown is a stepless automatic locking mechanism for use with lifting devices, comprising: Fixed beam 1: As the reference component of the mechanism, it bears part of the fixed load.

[0025] Movable beam 2: Installed inside the fixed beam 1 to enable telescopic movement.

[0026] Motor reducer 3: Fixed on the movable beam 2, providing power to drive the lead screw 6 to rotate.

[0027] Rigid coupling 4: used to transmit the power output from the motor reducer 3 to the lead screw 6, and can withstand a certain axial force.

[0028] Bearing seat 5: Fixed on the movable beam 2, used to support the rotating part of the lead screw 6 and bear the tension during the extension and retraction of the mechanism.

[0029] Lead screw 6: It engages with nut 7 via threads. When the motor reducer 3 drives the lead screw 6 to rotate, the lead screw 6 moves linearly relative to the nut 7, thereby driving the movable beam 2 connected to the lead screw 6 to extend and retract linearly.

[0030] Nut 7: It engages with screw 6 via threads and is mounted on nut seat 8.

[0031] Nut seat 8: Fixed on the fixed beam 1, bearing the nut 7 and fixing it to the fixed beam 1.

[0032] Traveling wheel 9: Installed at the tail of lead screw 6, used to limit the linear movement of lead screw 6 inside fixed beam 1 and prevent it from swaying.

[0033] The specific structural relationships and modes of motion are as follows: The movable beam 2 is installed inside the fixed beam 1. The nut seat 8 is fixed to the fixed beam 1 and has a nut 7 installed on it. The nut 7 is threaded to the lead screw 6. The motor reducer 3 is fixed to the movable beam 2 and drives the lead screw 6 to rotate via a rigid coupling 4. The bearing seat 5 is also fixed to the movable beam 2 to support the lead screw 6.

[0034] When the motor reducer 3 starts and drives the lead screw 6 to rotate through the rigid coupling 4, the lead screw 6 will move linearly relative to the nut 7 because the lead screw 6 is threadedly engaged with the nut 7 fixed on the fixed beam 1. Since the lead screw 6 is connected to the movable beam 2, the movable beam 2 will extend and retract linearly relative to the fixed beam 1.

[0035] When the movable beam 2 extends or retracts to the preset position, the motor reducer 3 stops rotating. At this time, the mechanism is in an automatic locking state through the threaded connection between the lead screw 6 and the nut 7. When a tensile force is applied to the movable beam 2, the tensile force acting on the movable beam 2 is transmitted through the movable beam 2 to the lead screw 6, and then through the thread of the lead screw 6 to the nut 7 and its fixing seat. The nut 7 is then fixed to the fixed beam 1, thus achieving structural locking and preventing the movable beam 2 and the fixed beam 1 from becoming relatively loose. In this state, the bearing seat 5 bears the tensile force, while the motor reducer 3 and the rigid coupling 4 are protected from destructive thrust.

[0036] To ensure the stability and linear motion of the lead screw 6, a traveling wheel 9 is installed at the tail of the lead screw 6. The traveling wheel 9 includes a second bearing seat 91, a traveling bracket 92, and a roller 93. The second bearing seat 91 and the traveling bracket 92 constitute the support structure of the traveling wheel 9. The roller 93 is installed on the traveling bracket 92 and cooperates with the inner wall of the fixed beam 1. By restricting the lead screw 6 with the roller 93, it is ensured that the lead screw 6 can only move linearly inside the fixed beam 1, and will not swing up, down, left, or right. This not only ensures the stability of the mechanism, but also reduces operating noise.

[0037] Working principle: Extension / Retraction Process: When extension / retraction is required, the control system activates the motor reducer 3. The motor reducer 3 outputs power, which drives the lead screw 6 to rotate via the rigid coupling 4. Since the thread of the lead screw 6 engages with the nut 7 fixed to the fixed beam 1, the lead screw 6 will move linearly along its axis. Because the lead screw 6 is connected to the movable beam 2, the movable beam 2 also extends or retracts linearly relative to the fixed beam 1. The extension / retraction length can be steplessly adjusted by controlling the rotation angle or time of the motor reducer 3.

[0038] Automatic locking: When the movable beam 2 extends or retracts to the preset position and needs to stop extending or retracting, the control system stops the rotation of the motor reducer 3. At this time, the lead screw 6 stops rotating, but because its thread is still engaged with the thread of the nut 7 and there is a certain preload, the mechanism is in a passive locking state. If an external pulling force is applied to the movable beam 2 at this time, the pulling force will be transmitted through the movable beam 2 to the lead screw 6, and then through the thread of the lead screw 6 to the nut 7 and its fixing seat. The nut 7 is fixed to the fixed beam 1. This pulling force will act between the threads of the lead screw 6 and the nut 7, causing the threads to generate a force that resists relative movement, thereby locking the mechanism. This force is partly borne by the bearing seat 5 and partly achieved through the locking between the threads of the lead screw 6 and the nut 7. Importantly, the movable beam 2 will not loosen from the fixed beam 1 at this time.

[0039] Stability and Noise Reduction: During the linear motion of the lead screw 6, the roller 93 in the traveling wheel 9 remains in contact with the inner wall of the fixed beam 1. Through preset adjustments, the lateral displacement (up, down, left, and right swing) of the lead screw 6 within the fixed beam 1 is limited. This not only ensures the smooth and precise linear motion of the lead screw 6 and prevents mechanism jamming caused by swinging, but also effectively reduces the noise generated by the friction between the lead screw 6 and the inner wall of the fixed beam 1.

[0040] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A telescopic mechanism for stepless automatic locking applied to lifting devices, characterized in that, include: Fixed beam; The movable beam is installed inside the fixed beam; The motor reducer is fixed on the movable beam; Rigid couplings are used to connect motor reducers and lead screws; The bearing housing is fixed to the movable beam. The lead screw has one end connected to the motor reducer via a rigid coupling, and the other end is equipped with a traveling wheel. The lead screw is also connected to the movable beam. Nut; Nut seat, fixed on fixed beam, nut is installed on nut seat, nut is connected to screw rod by thread; The traveling wheel, installed at the tail of the lead screw, is used to guide the lead screw to move linearly within the fixed beam.

2. The telescopic mechanism according to claim 1, characterized in that, When the lead screw rotates, it moves linearly relative to the nut fixed on the fixed beam through thread engagement, thereby driving the movable beam connected to the lead screw to extend and retract linearly relative to the fixed beam.

3. The telescopic mechanism according to claim 1, characterized in that, The traveling wheel includes a second bearing seat, a traveling bracket, and a roller. The second bearing seat is mounted on the traveling bracket, the roller is mounted on the traveling bracket, and the traveling wheel is mounted as a whole on the tail of the lead screw. The roller restricts the lead screw inside the fixed beam.

4. The telescopic mechanism according to claim 3, characterized in that, The roller restricts the screw from swinging up, down, left, and right within the fixed beam.

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