A falling protection device of a large industrial portal crane

Abstract

This utility model relates to the field of protective mechanism technology. To address the problem of gate collapse when the worm gear of a gantry crane wears out or fails after prolonged use, it provides a fall prevention device for large industrial gantry cranes. The device includes a gearbox containing a worm and a worm wheel that cooperate with each other. A safety plate is attached to the side of the worm wheel, and the safety plate has the same machined tooth shape and circumferential size as the worm wheel. The safety plate cooperates with the worm. A countersunk hole is drilled on the end face of the worm wheel, and a spring and a safety pin are installed. When fixed, the safety pin is blocked by the solid part of the safety plate. A through hole is provided on the circumference of the safety plate at a position directly opposite the safety pin. Countersunk holes are spaced apart on the circumference of the inner wall of the gearbox at positions directly opposite the safety pin. The worm wheel is connected to the output shaft via a flat key. This utility model, when the worm wheel teeth wear out, uses a mechanical interlocking method where the safety pin automatically pops out and engages with the countersunk hole in the gearbox to prevent the output shaft from rotating freely, thereby effectively preventing the gate from falling.

Description

Technical Field

[0001] This utility model relates to the field of protective mechanism technology, specifically to a fall prevention device for a large industrial gantry crane. Background Technology

[0002] Large industrial gantry cranes are increasingly used in various applications, such as manufacturing, logistics and warehousing, aviation and transportation, and special industries like fire-proof and explosion-proof environments and high-cleanliness environments. After a period of use, wear on the copper worm gear is a concern. To prevent the gantry from falling due to worm gear failure, which could cause mechanical injury, a sudden fall could directly result in personnel being impacted or crushed (especially the head / torso), potentially fatal. Broken metal / glass parts could cause secondary cuts, and property damage is also a concern.

[0003] 1. Equipment damage

[0004] - The door can damage goods in transit or production line equipment (a single incident can result in losses of hundreds of thousands of yuan);

[0005] - Track deformation can render the entire door system unusable;

[0006] 2. Production interruption

[0007] - The average repair time after an accident is 2-7 days, resulting in losses due to work stoppage.

[0008] Special scenarios such as cold chain logistics may cause goods to spoil.

[0009] There are other derivative risks, and this phenomenon can cause a great deal of risk.

[0010] This is a problem that urgently needs to be solved by us. Utility Model Content

[0011] The purpose of this invention is to overcome the shortcomings of the prior art and provide a fall prevention device for large industrial gantry cranes that prevents the gate from falling when the worm gear is worn out or fails after long-term use.

[0012] The anti-fall device of a large industrial gantry crane is designed as follows: A transmission worm and worm wheel are installed inside the gearbox. The worm and worm wheel cooperate with each other, and a safety plate is tightly attached to the side of the worm wheel. The safety plate has the same machined tooth shape and circumferential size as the worm wheel. The safety plate cooperates with the worm and is mounted on the output shaft via a bushing. Under external force, the safety plate can rotate around the shaft. A countersunk hole is drilled on the end face of the worm wheel, and a spring and safety pin are installed. When fixed, the safety pin is blocked by the solid part of the safety plate. A through hole is provided on the circumference of the safety plate, directly opposite the safety pin. The through hole is large enough for the safety pin to extend out of the countersunk hole on the end face of the worm wheel and into a countersunk hole in the inner wall of the gearbox. Countersunk holes are spaced apart on the circumference of the inner wall of the gearbox, directly opposite the safety pin. The worm wheel and the output shaft are connected by a flat key.

[0013] Working principle: During normal operation, the safety plate rotates synchronously with the worm gear, and the safety pin is blocked. When all the teeth of the worm gear are worn, due to the weight of the door, the output shaft will drive the worm gear to rotate freely, while the safety plate and the worm are still in a meshing state. The worm gear and the safety plate will have relative movement. At this time, the safety pin inside the worm gear will be ejected from the hollow hole of the safety plate under the action of the spring and enter the countersunk hole of the gearbox, thereby locking the worm gear and the gearbox to prevent the door from falling.

[0014] The anti-fall device for a large industrial gantry crane obtained by this utility model has the following advantages: by setting a toothed safety plate and a spring safety pin mechanism on the side of the worm gear, when the worm gear teeth wear out, the safety pin can automatically pop out and lock into the countersunk hole of the gearbox through a mechanical interlocking method, instantly fixing the worm gear to the gearbox body, preventing the output shaft from rotating freely, thereby effectively preventing the gate from falling and significantly improving safety and reliability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0016] Figure 2 This is a schematic diagram of the worm gear and worm shaft in Embodiment 1 of this utility model. Detailed Implementation

[0017] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0018] Example 1:

[0019] like Figure 1 , 2As shown, this utility model discloses a fall prevention device for a large industrial gantry crane. A transmission worm 2 and a worm wheel 3 are installed inside a gearbox 1. The worm 2 and worm wheel 3 cooperate with each other. The side of the worm wheel 3 is in close contact with a safety plate 7. The safety plate 7 and the worm wheel 3 have the same machined tooth shape and tooth circumference. The safety plate 7 cooperates with the worm 2 and is mounted on the output shaft 9 via a bushing. Under external force, the safety plate 7 can rotate around the shaft. A countersunk hole is drilled on the end face of the worm wheel 3, and a spring 4 and a safety pin 5 are installed. When fixed, the safety pin 5 is blocked by the solid part of the safety plate 7. A through hole 10 is provided on the circumference of the safety plate 7 at a position directly opposite to the safety pin 5. Countersunk holes 6 are spaced apart on the circumference of the inner wall of the gearbox 1 at positions directly opposite to the safety pin 5. The size of the through hole 10 ensures that the safety pin 5 can extend out of the countersunk hole on the end face of the worm wheel 3 and into the countersunk hole 6 on the inner wall of the gearbox 1. The worm wheel 3 and the output shaft 9 are connected by a flat key 8.

[0020] Working principle: During normal operation, the safety plate 7 and the worm gear 3 rotate synchronously, and the safety pin 5 is blocked. When all the teeth of the worm gear 3 are worn, due to the weight of the door, the output shaft 9 will drive the worm gear 3 to rotate freely, while the safety plate 7 and the worm 2 are still in a meshing state. The worm gear 3 and the safety plate 7 will have relative movement. At this time, the safety pin 5 inside the worm gear 3 will be ejected from the through hole 10 of the safety plate 7 under the action of the spring 4 and enter the countersunk hole 6 of the gearbox 1, thereby locking the worm gear 3 and the gearbox 1 to prevent the door from falling.

Claims

1. A large industrial door machine anti-falling device, comprising a reduction gearbox, a transmission worm and a worm gear are arranged in the reduction gearbox, the worm and the worm gear cooperate with each other, characterized in that: The worm gear has a safety plate attached to its side. The safety plate and the worm gear have the same machined tooth profile and tooth circumference. The safety plate mates with the worm and is mounted on the output shaft via a bushing. Under external force, the safety plate can rotate around the shaft. The end face of the worm gear has a countersunk hole and is fitted with a spring and a safety pin. When fixed, the safety pin is blocked by the solid part of the safety plate. A through hole is provided on the circumference of the safety plate, directly opposite the safety pin. The through hole is large enough for the safety pin to extend out of the countersunk hole on the end face of the worm gear and into the countersunk hole on the inner wall of the gearbox. Countersunk holes are spaced apart on the circumference of the inner wall of the gearbox, directly opposite the safety pin. The worm gear and the output shaft are connected by a flat key.

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