Construction hoist anti-falling automatic door

Abstract

This invention belongs to the field of construction hoists and provides an automatic anti-fall door for construction hoists, including an anti-fall device. The anti-fall device comprises a tension sensor, door ear plates, a limiting bend plate, an adjusting screw, a bushing, a torsion spring, and a limiting block. When the hoist door experiences abnormal or unstable jamming during closing, the chain on the side of the hoist door loses tension and slackens. The tension sensor detects the disappearance of tension and instructs the automatic door motor to stop, preventing the chain from continuing to operate and causing the chain on the side of the hoist door to become continuously slack and accumulate. When the tension sensor fails, the chain tension on the limiting bend plate disappears. Under the action of the torsion spring, the limiting bend plate rotates around the bushing until it contacts the door frame. When the hoist door suddenly falls, the limiting bend plate slides downward along the door frame and locks onto the limiting block of the door frame, preventing the hoist door from continuing to fall. This invention effectively prevents accidental falls that could injure people and improves the reliability of automatic doors.

Description

Technical Field

[0001] This invention belongs to the field of construction hoists, and specifically relates to an automatic anti-fall door for construction hoists. Background Technology

[0002] Intelligent construction hoists are intelligent hoists that integrate automated control, artificial intelligence recognition, Internet of Things data monitoring and remote operation and maintenance technologies. They have functions such as floor call, in-cage floor selection, identification of professional personnel and number of passengers, automatic leveling and intelligent monitoring, and do not require a dedicated driver.

[0003] The automatic doors of intelligent construction hoists mainly come in two types: rack and pinion driven and chain driven. Currently, chain-driven automatic doors generally have the following problems: 1. When an automatic door closes, it moves downwards under its own weight, which may cause abnormal or unstable jamming. Because the chain drive is a flexible connection, if the chain continues to run after the door jams, it will cause the chain to lose tension and accumulate on the side of the automatic door. In actual use, this can lead to abnormal jamming of the automatic door, sudden drop after the chain slackens and accumulates, resulting in personal injury and property damage.

[0004] 2. Automatic doors typically open and close using limit switches. Excessive opening and closing speeds can easily lead to door overshooting during opening and overtravel during closing for double-leaf automatic doors.

[0005] 3. The chain is prone to skipping teeth and falling off. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the above-mentioned background technology and provide an automatic door for construction hoists to prevent accidental falls that could injure people, automatic door opening failures, double door closing failures, and chain tooth breakage, thereby improving the reliability of the automatic door.

[0007] The objective of this invention is achieved through the following technical measures.

[0008] An automatic anti-fall door for a construction hoist includes an anti-fall device comprising a tension sensor, door body ear plates, a limiting bent plate, an adjusting screw, a bushing, a torsion spring, and a limiting block. The limiting bent plate is fixed to the door body ear plates via the bushing and bolts. A torsion spring is mounted on the bushing, with one end of the torsion spring contacting and positioning the door body ear plates, and the other end contacting and positioning the limiting bent plate. The bushing adjusts the limiting bent plate to a position relative to the limiting block. The limiting bent plate can rotate around the bushing. The limiting bent plate is located outside the door frame, and its bottom... The door is V-shaped, with multiple limiting blocks evenly distributed on both sides of the door frame along the closing stroke of the cage door. A V-shaped notch is formed between the limiting blocks and the door frame, interlocking with the V-shaped bottom of the limiting bend plate. The upper part of the limiting bend plate has a mounting hole for an adjusting screw, which is clamped and locked by upper and lower nuts. A tension sensor is mounted on the upper part of the adjusting screw, and the upper part of the tension sensor is connected to the chain via a pull ring. The adjusting screw can be moved up and down to adjust the chain length. The mounting hole of the adjusting screw is offset from the mounting hole of the limiting bend plate for easy adjustment by fixing the nuts. To adjust the chain length, simply loosen the nuts and slide the adjusting screw up and down. When the cage door is blocked, the tension sensor detects that the tension on the chain on the side of the cage door has disappeared, and instructs the drive device of the automatic door motor to stop. When the tension sensor fails, the chain tension on the limit plate disappears. Under the action of the torsion spring, the limit plate rotates around the bushing until it contacts the door frame. When the cage door suddenly falls, the limit plate slides down along the door frame and gets stuck on the limit block of the door frame to prevent the cage door from falling further.

[0009] Furthermore, the construction hoist anti-fall automatic door includes a door limiting device, which comprises a limiter, a closing stop block, an opening stop block, a limiting extension plate, and a limiting rod. The limiter is installed on the lintel of the hoist cage door. The closing stop block and the opening stop block are respectively installed on the left and right sides of the hoist cage door opposite to the limiter. The opening stop block is installed at the lower part of the door body, and the closing stop block is installed at the upper part of the door body. A limiting extension plate is also provided at the lower part of the door body. The opening stop block is connected to the limiting extension plate to increase the effective length of the opening limit and prevent the door from moving too fast, causing the limiting action to exceed the opening stop block and the limiting to fail.

[0010] Furthermore, when the construction hoist anti-fall automatic door adopts a double-door design, limit bars are installed on both sides of the door frame between the upper and lower half of the door. When the closing block fails, the limit bars on both sides block the door ear plate, causing the upper and lower half of the door to stop moving.

[0011] Furthermore, the construction hoist anti-fall automatic door includes a chain anti-detachment guard, which is installed on the drive device of the automatic door motor. The guard and the chain wheel teeth cooperate to form a semi-circle to prevent the chain from jumping off the teeth. At the same time, a baffle is set on the outside of the guard to prevent the chain from falling off after the chain accidentally jumps off the teeth.

[0012] Compared with the prior art, the automatic anti-fall door for construction hoists of this invention has the following advantages: 1. Install anti-fall devices to solve the problem of the cage door falling and injuring people when the automatic door closes, from both electrical and mechanical anti-fall perspectives; 2. Install a limit extension plate to extend the door opening limit length and solve the problem of automatic doors hitting the top when opening; 3. Add a limit bar to solve the problem of excessive travel when closing double-door automatic doors; 4. An adjusting screw is installed to adjust the chain length; 5. Install a protective cover to prevent the chain from slipping off teeth. Attached Figure Description

[0013] Figure 1 This is a front view of the hoisting cage.

[0014] Figure 2 This is a left view of the hoisting cage.

[0015] Figure 3 This is a right view of the hoisting cage.

[0016] Figure 4 This is a front view of a single door.

[0017] Figure 5 This is a rear view of a single door.

[0018] Figure 6 This is a top view of a single door.

[0019] Figure 7 for Figure 6 FF sectional view.

[0020] Figure 8 This is a side view of a single door.

[0021] Figure 9 for Figure 8 Enlarged view of section B in the middle.

[0022] Figure 10 This is a front view of the upper half of the door.

[0023] Figure 11 This is a front view of the upper half of the door in its fall-prevention configuration.

[0024] Figure 12 Left view of the upper half of the door in fall-prevention mode.

[0025] Figure 13 for Figure 11 Enlarged view of point F in the middle.

[0026] Figure 14 for Figure 1 Cross-sectional view of KK.

[0027] Figure 15This is a side view of the upper half of the door.

[0028] Figure 16 for Figure 15 Enlarged view of point M in the middle.

[0029] Figure 17 This is a partial isometric view of the hoisting cage.

[0030] Figure 18 for Figure 17 Enlarged view of section L in the middle.

[0031] Figure 19 for Figure 1 Enlarged view of point K.

[0032] The components are: 1. Cage frame, 2. Chain, 3. Door counterweight, 4. Upper door, 5. Lower door, 6. Limiting rod, 7. Single door, 8. Drive unit, 9. Tension sensor, 10. Limiting bend plate, 11. Door ear plate, 12. Single door body, 13. Closing stop block, 14. Opening stop block, 15. Limiting extension plate, 16. Adjusting screw, 17. Nut, 18. Torsion spring, 19. Bushing, 20. Bolt, 21. Upper door body, 22. Door frame, 23. Limiting block, 24. Limiter, 25. Chain anti-detachment cover. Detailed Implementation

[0033] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0034] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0036] like Figures 1 to 13As shown, the chain-driven automatic door mainly consists of a single door 7 (or upper half door 4), a door counterweight 3 (or lower half door 5), a chain 2, and a drive device 8. This embodiment of the construction hoist anti-fall automatic door includes an anti-fall device, which comprises a tension sensor 9, a door body ear plate 11, a limiting bent plate 10, an adjusting screw 16, a bushing 19, a torsion spring 18, and a limiting block 23. The limiting bent plate 10 is fixed to the door body ear plate 11 by the bushing 19 and bolts. The torsion spring 18 is installed on the bushing 19, with one end contacting and positioning the door body ear plate 11 and the other end contacting and positioning the limiting bent plate 10. The bushing 19 adjusts the limiting bent plate 10 to a position relative to the limiting block 23. The limiting bent plate 10 can rotate around the bushing 19 and is located outside the door frame 22. The bottom of the limiting bend plate 10 is V-shaped. Multiple limiting blocks 23 are evenly distributed on both sides of the door frame 22 along the closing stroke of the cage door. A V-shaped notch is formed between the limiting block 23 and the door frame 22, interlocking with the V-shaped notch at the bottom of the limiting bend plate 10. The upper part of the limiting bend plate 10 has a mounting hole for an adjusting screw 16. The adjusting screw 16 is clamped and locked by upper and lower nuts 17. A tension sensor 9 is mounted on the upper part of the adjusting screw 16, and the upper part of the tension sensor 9 is connected to the chain 2 via a pull ring. The adjusting screw 16 can move up and down to adjust the length of the chain 2. The mounting hole of the adjusting screw is offset from the mounting hole of the limiting bend plate, facilitating the adjustment of the fixing nuts. To adjust the chain length, simply loosen the nut 17 and slide the adjusting screw 16 up and down to achieve the chain length adjustment. When the cage door is blocked, the tension sensor 9 senses that the tension of the chain on the side of the cage door has disappeared, and instructs the drive device 8 of the automatic door motor to stop. When the tension sensor 9 fails, the chain tension on the limit plate 10 disappears. Under the action of the torsion spring 18, the limit plate 10 rotates around the bushing 19 until it contacts the door frame 22. When the cage door suddenly falls, the limit plate 10 slides down along the door frame and gets stuck on the door frame limit block 23 to prevent the cage door from falling further.

[0037] like Figure 5 , Figure 10 , Figures 14 to 18 As shown, the automatic anti-fall door of the construction hoist in this embodiment includes a door limiting device. The door limiting device includes a limiter 24, a closing stop block 13, an opening stop block 14, a limiting extension plate 15, and a limiting rod 6. The limiter 24 is electrically limited. Two limiters 24 are installed on the lintel of the hoist cage door. The closing stop block 13 and the opening stop block 14 are respectively set on the left and right sides of the hoist cage door opposite to the limiters. The opening stop block 14 is installed at the lower part of the door body, and the closing stop block 13 is installed at the upper part of the door body. The lower part of the door body is also provided with a limiting extension plate 15. The opening stop block 14 is connected to the limiting extension plate 15 to increase the effective length of the opening limit and prevent the door from moving too fast, causing the limiting action to exceed the opening stop block and the limiting to fail.

[0038] When the construction hoist anti-fall automatic door adopts a double-door design, limit rods 6 are installed on both sides of the door frame between the upper and lower half of the door. When the closing block 13 fails, the limit rods 6 on both sides block the door ear plate, stopping the upper and lower half of the door from moving.

[0039] like Figure 19 As shown, the construction hoist anti-fall automatic door in this embodiment includes a chain anti-detachment cover 25. The chain anti-detachment cover 25 is installed on the drive device 8 of the automatic door motor. The cover and the chain wheel teeth cooperate to form a semi-circle to prevent the chain from jumping off the teeth. At the same time, a baffle is set on the outside of the cover to prevent the chain from falling off after the chain accidentally jumps off the teeth.

[0040] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0041] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An automatic anti-fall door for a construction hoist, characterized in that: The device includes a fall protection system comprising a sensor, a door ear plate, a limiting bend plate, an adjusting screw, a bushing, a torsion spring, and a limiting block. The limiting bend plate is fixed to the door ear plate via the bushing and bolts. A torsion spring is mounted on the bushing, with one end contacting and positioning the door ear plate and the other end contacting and positioning the limiting bend plate. The bushing adjusts the limiting bend plate to a position relative to the limiting block. The limiting bend plate can rotate around the bushing. The limiting bend plate is located outside the door frame, and its bottom is V-shaped. Multiple limiting blocks are evenly distributed on both sides of the door frame along the closing stroke of the cage door. A V-shaped notch is formed between the limiting block and the door frame, and this V-shaped notch interlocks with the V-shaped bottom of the limiting bend plate. The upper part of the limiting bend plate is provided with an installation hole for an adjusting screw. The adjusting screw is clamped and locked by upper and lower nuts. A tension sensor is installed on the upper part of the adjusting screw. The upper part of the tension sensor is connected to the chain through a pull ring. The adjusting screw can move up and down to adjust the length of the chain. When the cage door is blocked when closing, the tension sensor senses that the tension of the chain on the side of the cage door has disappeared, and commands the drive device of the automatic door motor to stop. When the tension sensor fails, the chain tension on the limiting bend plate disappears. Under the action of the torsion spring, the limiting bend plate rotates around the bushing until it contacts the door frame. When the cage door suddenly falls, the limiting bend plate slides down along the door frame and gets stuck on the door frame limiting block to prevent the cage door from falling further.

2. The automatic anti-fall door for construction hoists according to claim 1, characterized in that: The device includes a door limiting device, comprising a limiter, a closing stop block, an opening stop block, a limiting extension plate, and a limiting rod. The limiter is installed on the lintel of the cage door. The closing stop block and the opening stop block are respectively installed on the left and right sides of the cage door opposite to the limiter. The opening stop block is installed at the lower part of the door body, and the closing stop block is installed at the upper part of the door body. A limiting extension plate is also provided at the lower part of the door body. The opening stop block is connected to the limiting extension plate to increase the effective length of the opening limit and prevent the door from moving too fast, causing the limiting action to exceed the opening stop block and the limiting to fail.

3. The automatic anti-fall door for construction hoists according to claim 2, characterized in that: When a double-door design is used, limit bars are installed on both sides of the door frame between the upper and lower doors. When the closing block fails, the limit bars on both sides block the door ear plates, stopping the upper and lower doors from moving.

4. The automatic anti-fall door for construction hoists according to claim 1, characterized in that: The system includes a chain anti-detachment cover, which is installed on the drive unit of the automatic door motor. The cover engages with the chain wheel teeth in a semi-circular shape to prevent the chain from skipping teeth and coming off. At the same time, a baffle is provided on the outside of the cover to prevent the chain from falling off after the chain accidentally skips teeth.

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