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CN-122009994-A - Electric lifting device and use method thereof

CN122009994ACN 122009994 ACN122009994 ACN 122009994ACN-122009994-A

Abstract

The invention discloses an electric lifting device and a using method thereof, the electric lifting device comprises a reduction box body, a driving shaft and a connecting rod are arranged in the reduction box body, a driving gear is arranged on the driving shaft, an inner ratchet wheel and an inner driven gear are arranged on the connecting rod, a threaded section and a tooth meshing section are formed on the connecting rod, the tooth meshing section is meshed with an outer driven gear on a load rotating shaft to drive the outer driven gear and the load rotating shaft to rotate, take-up and pay-off actions of a wire spool are achieved, the inner driven gear and the inner ratchet wheel are arranged on the threaded section and move in the rotating process, a pawl is arranged in the reduction box body, the pawl and the inner ratchet wheel form a self-locking assembly, and the rotating direction of the inner ratchet wheel is controlled. The transmission efficiency is guaranteed through a plurality of groups of gear meshing transmission modes, the pawl enables the inner ratchet wheel to rotate in a single direction only, a self-locking structure is formed, the inner ratchet wheel is switched between unlocking and locking states, the condition that the power can be effectively transmitted and the load rotating shaft is prevented from reversing is guaranteed, and the running stability and safety of equipment are improved.

Inventors

  • CHENG HUIYONG

Assignees

  • 苏州虎奇翼自动化设备有限公司

Dates

Publication Date
20260512
Application Date
20260403

Claims (10)

  1. 1. The electric lifting device is characterized by comprising a reduction box body (100) arranged at an output end of a motor, wherein a driving shaft (11) connected to the output end of the motor and a connecting rod (12) parallel to the driving shaft (11) are arranged in the reduction box body (100), a driving gear (111) is arranged on the driving shaft (11), an inner ratchet wheel (122) and an inner driven gear (121) meshed with the driving gear (111) are arranged on the connecting rod (12), a threaded section (1201) and a meshing tooth section (1202) are formed on the connecting rod (12), the meshing tooth section (1202) is meshed with an outer driven gear (21) on a load rotating shaft (2) and drives the outer driven gear (21) and the load rotating shaft (2) to rotate, take-up and pay-off actions of a wire winding disc connected to the load rotating shaft (2) are achieved, the inner driven gear (121) and the inner ratchet wheel (122) are arranged on the threaded section (1201) and move along the arrangement direction of the threaded section (111) in the rotating process, and the inner ratchet wheel (1201) is located on the outer side of the ratchet wheel (100) and the inner ratchet wheel (122) is controlled by the ratchet wheel assembly (13) and the ratchet assembly is rotated by the ratchet wheel.
  2. 2. The electric lifting device according to claim 1, wherein a gap for accommodating the first bearing (101) is formed between one end of the driving shaft (11) and the connecting rod (12) near the motor and the reduction box (100).
  3. 3. The electric lifting device according to claim 1, wherein the driving gear (111) and the inner driven gear (121) are helical gears and have a tooth width larger than that of the inner driven gear (121), and the driving gear (111) drives the inner driven gear (121) to rotate and move along the setting direction thereof during operation.
  4. 4. The electric lifting device according to claim 1, wherein the inner ratchet wheel (122) is connected with the threaded section (1201) through a flange (123), the diameter of the flange (123) is smaller than that of the inner ratchet wheel (122), the flange (123) is located at the position, close to the tooth section (1202), of the threaded section (1201) in an initial state and is abutted against the end portion of the tooth section (1202), ratchets of the inner ratchet wheel (122) are inclined teeth inclined towards the pawl (13), the pawl (13) is arranged in the reduction box body (100) through a connecting shaft (131), and the pawl (13) is pivotally connected with the connecting shaft (131).
  5. 5. The electric lifting device according to claim 1, wherein the tooth meshing section (1202) is a spiral gear, the direction of which is consistent with the arrangement direction of the inner driven gear (121), and one end of the tooth meshing section (1202) away from the thread section (1201) is abutted to the inner wall of the reduction gearbox (100) and is arranged in the reduction gearbox (100) through the second bearing (102).
  6. 6. The electric lifting device according to claim 1, wherein the load rotating shaft (2) is arranged in parallel with the driving shaft (11), one end of the load rotating shaft (2) penetrates through and protrudes out of the outer end face of the reduction gearbox (100), and the load rotating shaft (2) is arranged in a through hole of the reduction gearbox (100) through a third bearing (103).
  7. 7. The electric lifting device according to claim 6, wherein the load rotating shaft (2) is provided with a placement area for limiting the outer driven gear (21), the outer driven gear (21) is sleeved in the placement area of the load rotating shaft (2) through a second flange (22), the outer driven gear (21) is connected with the second flange (22) through a spline, and the outer driven gear (21) is a spiral gear and has a tooth width smaller than that of the tooth engaging section (1202).
  8. 8. The electric lifting device according to claim 7, wherein a group of waist-shaped grooves (220) are formed in the circumferential surface of the second flange (22) facing the outer driven gear (21), the ends of the waist-shaped grooves (220) in the same direction are smoothly transited to the groove bottom through guide cambered surfaces, the other ends of the waist-shaped grooves and the groove bottom are transited vertically through straight lines, a group of containing holes (210) for installing positioning pins are formed in the circumferential surface of the outer driven gear (21), and the free ends of the positioning pins are abutted to the groove bottom of the waist-shaped grooves (220).
  9. 9. The electric lifting device according to claim 1, wherein a heat dissipation fan (3) is further arranged at one end of the driving shaft (11) close to the motor shaft, and the heat dissipation fan (3) and the driving shaft (11) synchronously rotate to dissipate heat in the inner space of the reduction gearbox (100).
  10. 10. The method of using an electric lifting device according to any one of claims 1 to 9, characterized in that the switching of the inner ratchet (122) between the two states unlocked or locked by the pawl (13) is achieved, comprising the steps of, S1.1, starting a motor shaft of the motor to rotate clockwise, and driving the driving shaft (11) and the driving gear (111) to synchronously rotate clockwise by the motor; S1.2, the driving gear (111) drives the inner driven gear (121) meshed with the driving gear to rotate in a counterclockwise direction, and the inner driven gear (121) gradually approaches the inner ratchet wheel (122) under the combined action of the driving gear (111) and the thread section (1201) in the rotating process until the inner driven gear (121) abuts against the inner ratchet wheel (122); S1.3, the inner driven gear (121) drives the inner ratchet wheel (122) to synchronously rotate and generates torsion for driving the whole connecting rod (12) to rotate in the anticlockwise direction so as to enable the connecting rod (12) to rotate in the anticlockwise direction, at the moment, the pawl (13) bounces between ratchet teeth of the inner ratchet wheel (122), and the inner ratchet wheel (122) is in an unlocking state; S1.4, the gear of the tooth meshing section (1202) arranged on the connecting rod (12) rotates anticlockwise and drives the outer driven gear (21) meshed with the gear and the load rotating shaft (2) to rotate clockwise, so that the paying-off action of the wire spool arranged on the load rotating shaft (2) is realized; S2.1, starting a motor shaft of the motor to rotate in a counterclockwise direction, and driving the driving shaft (11) and the driving gear (111) to synchronously rotate in the counterclockwise direction by the motor; S2.2, the driving gear (111) drives the inner driven gear (121) meshed with the driving gear to rotate clockwise, the inner driven gear (121) gradually deviates from the inner ratchet wheel (122) under the joint of the driving gear (111) and the threaded section (1201) in the rotating process, the inner ratchet wheel (122) is limited by the pawl (13) to stop rotating during initial movement, and the inner ratchet wheel (122) is in a locked state until the inner driven gear (121) is completely separated from the inner ratchet wheel (122) and moves to the end part of the threaded section (1201); S2.3, the inner driven gear (121) rotates and generates torsion for driving the whole connecting rod (12) to rotate clockwise to drive the whole connecting rod (12) to rotate clockwise, at the moment, the inner ratchet wheel (122) gradually approaches the inner driven gear (121) under the action of the thread section (1201) and gradually breaks away from the pawl (13), the rotation limitation of the pawl (13) on the inner ratchet wheel (122) is relieved, and the inner ratchet wheel (122) is in an unlocking state again; S2.4, the gear of the tooth meshing section (1202) arranged on the connecting rod (12) rotates clockwise and drives the outer driven gear (21) meshed with the gear and the load rotating shaft (2) to rotate anticlockwise, so that the winding action of the wire spool arranged on the load rotating shaft (2) is realized.

Description

Electric lifting device and use method thereof Technical Field The invention belongs to the technical field of electric tools, and particularly relates to an electric lifting device and a using method thereof. Background In hoisting equipment such as a crane, a reduction gearbox is a core component for realizing winding and unwinding operations. In the prior art, in order to realize the functions of speed reduction and wire winding and unwinding, a worm and gear structure is generally adopted as a transmission mechanism. However, the worm gear transmission mode has larger relative sliding among tooth surfaces in the running process, and the friction loss is remarkable, so that the transmission efficiency is generally lower (usually 60% -90%), and particularly the efficiency is lower under the working condition of needing a self-locking function. The characteristics make the worm and gear structure difficult to be suitable for long-time continuous working scenes, and have the problems of large heating value, high energy consumption, limited service life and the like. In order to solve the efficiency problem, part of the technical schemes adopt a planetary gear transmission structure. For example, chinese patent CN208203922U discloses a "speed reducer for tower crane", which adopts a planet carrier structure to realize speed reduction transmission, and has the advantages of high transmission efficiency and strong bearing capacity. However, this structure still has the following drawbacks in practical applications: Firstly, the planet carrier structure cannot realize reverse self-locking. In order to prevent uncontrolled reverse rotation of the load rotating shaft caused by overlarge load of the load connected to the load rotating shaft, a sun gear with a larger specification is generally required to be selected to increase the reverse resistance of the system, so that the whole equipment is increased in size and manufacturing cost, and the miniaturization and the light-weight design of the equipment are not facilitated. Secondly, the axis of the sun gear and the load rotating shaft in the planet carrier structure are usually coaxially arranged. When the load rotating shaft is accidentally stuck and cannot rotate due to external impact, foreign matter stuck or abnormal load, the internal gear of the planet carrier does not rotate or only has tiny elastic deformation, but the static stress born by the gear pair is far over-rated by a design value, so that the system enters a static overload state. At this time, if the protection device does not respond in time, the gear is extremely easy to damage, even if the protection device is triggered normally, the equipment needs to be stopped for processing, and the rotation motion can not be continuously transmitted under the condition that the load rotating shaft is blocked, so that the continuity and the reliability of the operation are affected. Thirdly, the internal gear of the planet carrier structure is precise, and the requirements on machining and assembling precision are high. Once the gear is damaged, the planetary system needs to be disassembled and re-centered integrally in the maintenance process, so that the on-site repair is difficult, the maintenance cost is high, and the use cost of the whole life cycle of the equipment is obviously increased. In summary, the existing speed reduction transmission mechanism for the crane is difficult to consider in terms of transmission efficiency, self-locking capability, overload resistance, maintenance convenience and the like, and a transmission solution with good self-locking characteristic, strong overload resistance and lower maintenance cost while ensuring efficient transmission is needed. Disclosure of Invention The present invention is directed to solving the above-mentioned problems of the prior art, and provides an electric lifting device and a method for using the same. The aim of the invention is achieved by the following technical scheme: The electric lifting device comprises a reduction box body arranged at the output end of a motor, a driving shaft connected to the output end of the motor and a connecting rod parallel to the driving shaft are arranged in the reduction box body, a driving gear is arranged on the driving shaft, an inner ratchet wheel and an inner driven gear meshed with the driving gear are arranged on the connecting rod, a thread section and a meshing tooth section are formed on the connecting rod, the meshing tooth section is meshed with an outer driven gear on a load rotating shaft and drives the outer driven gear and the load rotating shaft to rotate, take-up and pay-off actions of a wire reel connected to the load rotating shaft are achieved, the inner driven gear and the inner ratchet wheel are arranged on the thread section and move along the arrangement direction of the thread section in the rotating process, a pawl abutted against the ratchet tooth valley is arranged on the outer