Anti-falling device for overhauling household elevator

Abstract

The utility model discloses an anti-falling device for overhauling a household elevator in the technical field of elevators, which comprises a support used for being connected with an elevator car guide rail, a stopping rod used for supporting an elevator car is rotatably connected onto the support, a locking piece used for fixing the stopping rod is arranged on the stopping rod, and travel switches are mounted at the upper end and the lower end of the support. The travel switch is located on the rotating path of the stop rod. The anti-falling device is simple in structure, the space size of the shaft does not need to be independently set during rail installation, the production cost is low, and the good anti-falling effect is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of elevator technology, and specifically relates to a fall prevention device for home elevator maintenance. Background Technology

[0002] Elevator maintenance is a high-risk operation, especially in home elevator shafts where space is limited and the shaft is narrow. During maintenance, personnel usually switch the switch to maintenance mode and then manually operate the car to raise or lower. Since there are no protective measures to support the car in the shaft, the car can easily fall, causing a safety accident.

[0003] To address the aforementioned technical issues, patents with publication number "CN221680461U" disclose a "mechanical stopping mechanism for home elevators," "CN213059757U" disclose a "mechanical stopping device applied to home elevators," and "CN211254869U" disclose a "mechanical stopping device for home elevators." All of these devices can effectively support the elevator car, but their overall structure is relatively complex and their production costs are high. Utility Model Content

[0004] The present invention aims to provide a fall prevention device for home elevator maintenance, which simplifies the device structure while ensuring fall prevention effect, thereby reducing production costs.

[0005] This solution provides a fall prevention device for home elevator maintenance, which includes a bracket for connecting the car guide rail, a stop bar for supporting the car rotatably connected to the bracket, a locking element for fixing the stop bar, and limit switches installed at both the upper and lower ends of the bracket, with the limit switches located on the rotation path of the stop bar.

[0006] The working principle and beneficial effects of this solution are as follows: Before use, the bracket is fixed to the car guide rail using the guide plate assembly. When maintenance personnel inspect the home elevator, they first rotate the stop lever to a horizontal position and fix it with the locking device. At this time, if the car falls unexpectedly, the falling car will contact the stop lever, which will support the car and prevent it from falling. Simultaneously, when the stop lever is in a horizontal position, the abutment plate will abut against the lower limit switch. The limit switch is triggered, transmitting a signal to the elevator control system, which then stops the elevator. After maintenance is completed, the locking device is released, and the stop lever is rotated to a vertical position so as not to affect the normal operation of the elevator. At this time, the stop lever moves away from the lower limit switch, and its end abuts against the upper limit switch. The limit switch is triggered, transmitting a signal to the elevator control system, which then controls the elevator to operate normally.

[0007] This solution achieves fall protection during home elevator maintenance through a combination of simple components such as a bracket, stop lever, locking mechanism, and limit switch. Compared to the complex fall protection devices in existing technologies, this solution significantly simplifies the structure. This simplification reduces the number of parts required, lowers the difficulty of processing and assembly, and effectively reduces production costs. The stop lever provides timely support when the car descends, while the limit switch provides immediate feedback on the car's status, providing dual protection for the safety of maintenance personnel.

[0008] Furthermore, the locking element is a bolt, and the side of the bracket is provided with a fixing hole for use with the bolt. When the stop lever is in a horizontal or vertical state, one of the bolts is coaxial with the corresponding fixing hole. The bolt and the fixing hole on the side of the bracket are used together. When the stop lever is in a horizontal or vertical state, the bolt and the corresponding fixing hole are coaxial. This connection method is simple, reliable, and easy to operate, and can stably fix the stop lever, ensuring that it will not rotate arbitrarily in the working state.

[0009] Furthermore, a support plate is fixedly connected to the side of the stop lever. The support plate is L-shaped, and one side of the support plate is fixedly connected to the stop lever. When the stop lever is in a horizontal state, the lower surface of the support plate abuts against the limit switch below. By setting up the support plate, when the stop lever is in a horizontal state, the lower surface of the support plate abuts against the limit switch below, which can accurately trigger the limit switch and promptly transmit the signal for the car to descend, improving the response speed and reliability of the device.

[0010] Furthermore, the stop lever is fixedly connected to a support plate perpendicular to it and used to support the car. The support plate is perpendicular to the car guide rail, and the bracket has a notch for the support plate to pass through. The notch is located between the fixing hole and the limit switch at the top. This ensures that the support plate can pass smoothly through the bracket when the stop lever rotates from a horizontal position to a vertical position, avoiding obstruction of the car's downward movement. At the same time, it ensures that the top of the stop lever, when in the vertical position, can rest against the limit switch above.

[0011] Furthermore, a positioning pin is fixedly connected to the side wall of the bracket, and one end of the stop lever has a through hole extending along the thickness direction of the stop lever. The stop lever is sleeved through this through hole and rotatably connected to the fixed outer pin. This connection method makes the rotation of the stop lever smoother, facilitates quick switching of the stop lever's state before and after maintenance, and improves work efficiency.

[0012] Furthermore, the limit switch is a UKT automatic reset switch. UKT automatic reset switches have advantages such as high sensitivity and high reliability, and can accurately detect changes in the position of the stop lever, promptly feeding back signals to the elevator control system to ensure the effective operation of the fall protection device.

[0013] Furthermore, a reinforcing rib is provided on the side of the bracket away from the car guide rail. The reinforcing rib enhances the strength and stability of the bracket, enabling it to better withstand the impact force when the car falls, thus extending the service life of the device. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a home elevator maintenance anti-fall device connected to the car guide rail, according to an embodiment of this utility model. Detailed Implementation

[0015] The following detailed description illustrates the specific implementation method:

[0016] The reference numerals in the accompanying drawings include: 1. Car guide rail; 2. Pressure guide plate assembly; 3. Second bolt; 4. Support plate; 5. Stop lever; 6. Bracket; 7. UKT automatic reset switch; 8. Support plate; 9. First bolt; 10. Positioning pin; 11. Fixing hole; 12. Notch; 13. Reinforcing rib plate.

[0017] The basic implementation examples are as follows: Figure 1 As shown: A fall prevention device for home elevator maintenance includes a stop bar 5 and a bracket 6 for connecting the car guide rail 1. The bracket 6 is placed vertically and has an "L"-shaped cross-section. Two reinforcing ribs 13 are welded to the concave side of the bracket 6. The bracket 6 is made of laser-cut steel plate and then bent. A notch 12 is laser-cut at the bend of the bracket 6, which extends completely to the shorter side of the bend. Two fixing holes 11 and one connecting hole are provided on the bend of the bracket 6. The three holes are distributed along the length of the bracket 6. The connecting hole is located between the two fixing holes 11. A positioning pin 10 is fixedly connected in the connecting hole. One end of the stop bar 5 has a through hole that extends along the thickness of the stop bar 5. The stop bar 5 is sleeved through the through hole and rotatably connected to the positioning pin 10.

[0018] The stop lever 5 is provided with a first bolt 9 and a second bolt 3 on the side away from the bracket 6. When the stop lever 5 is in a horizontal position, the first bolt 9 is coaxial with the lower fixing hole 11. At this time, the stop lever 5 can be fixed by connecting the first bolt 9 with the lower fixing hole 11. When the stop lever 5 is in a vertical position, the second bolt 3 is coaxial with the upper fixing hole 11. At this time, the stop lever 5 can be fixed by connecting the second bolt 3 with the upper fixing hole 11. The stop lever 5 is the main load-bearing component of the car and is made of steel plate with a thickness of 16mm.

[0019] UKT automatic reset switches 7 are installed at both the top and bottom of the bracket 6. The UKT automatic reset switches 7 are located on the rotation path of the stop lever 5. The notch 12 is located between the fixing hole 11 and the top UKT automatic reset switch 7. A support plate 8 is fixedly connected to the side of the stop lever 5. That is, the support plate 8 is fixedly connected to the side of the stop lever 5 away from the bracket 6 by screws. The longitudinal section of the support plate 8 is "L" shaped. One outer wall of the support plate 8 is fixedly connected to the stop lever 5. When the stop lever 5 is in a horizontal state, the lower surface of the support plate 8 abuts against the UKT automatic reset switch 7 below. The stop lever 5 is fixedly connected to a support plate 4 that is perpendicular to it and used to support the car. The support plate 4 is perpendicular to the car guide rail 1. When the stop lever 5 is in a horizontal position, the support plate 4 is also horizontally loaded, which can support the car. When the stop lever 5 drives the support plate 4 to rotate and the stop lever 5 is in a vertical position, the support plate 4 passes through the notch 12 on the bracket 6 and the top of the stop lever 5 abuts against the UKT automatic reset switch 7 above.

[0020] The specific implementation process is as follows: (see attached document) Figure 1 As shown, before use, use the pressure guide plate assembly 2 to fix the bracket 6 on the car guide rail 1. When fixing, the bracket 6 and the car guide rail 1 need to be completely in contact to ensure that it is secure. Ensure that the UKT automatic reset switch 7 is in the working position and non-working position and is connected in series with the elevator safety circuit and maintenance circuit respectively to ensure the safe operation of the elevator. The working state is switched by rotating the stop lever 5.

[0021] When maintenance personnel are preparing to inspect the home elevator, they rotate the stop lever 5 to a horizontal position. At this time, they check whether the first bolt 9 and the lower fixing hole 11 are coaxial. After confirming that there is no problem, they screw the first bolt 9 into the lower fixing hole 11 and tighten the first bolt 9 to firmly fix the stop lever 5 in a horizontal position.

[0022] Since the stop lever 5 is in a horizontal position, the lower surface of its side abutment plate 8 precisely abuts against the UKT automatic reset switch 7 below, triggering the UKT automatic reset switch 7. Once triggered, the UKT automatic reset switch 7 immediately transmits a signal to the elevator control system, causing the elevator control system to stop the elevator, preventing accidental operation during maintenance. If, during maintenance, the car comes into contact with the horizontally positioned support plate 4, the support plate 4 provides support for the car, effectively preventing it from falling and ensuring the safety of maintenance personnel.

[0023] After the maintenance work is completed, first unscrew the first bolt 9 to release the stop lever 5 from its fixation. Then rotate the stop lever 5 to a vertical position. At this time, the second bolt 3 is coaxial with the upper fixing hole 11. Screw the second bolt 3 into the upper fixing hole 11 and tighten the second bolt 3 to fix the stop lever 5 in a vertical position.

[0024] When the stop lever 5 is in the vertical position, the top of the stop lever 5 will abut against the UKT automatic reset switch 7 above, triggering the UKT automatic reset switch 7. After the UKT automatic reset switch 7 is triggered, it transmits a signal to the elevator control system, causing the elevator control system to control the elevator to resume normal operation.

[0025] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A home elevator maintenance use fall protection device comprising a bracket for connecting a car guide rail, characterized by: The support is rotationally connected with a stop rod for supporting the car, the stop rod is provided with a locking member for fixing the stop rod, the upper and lower ends of the support are both provided with a travel switch, and the travel switch is located on the rotation path of the stop rod.

2. The anti-falling device for home elevator maintenance according to claim 1, characterized in that: The locking member is a bolt, the side of the support is provided with a fixing hole for cooperating with the bolt, and one of the bolts is coaxial with the corresponding fixing hole when the stop rod is in the horizontal or vertical state.

3. The anti-falling device for home elevator maintenance according to claim 2, characterized in that: The side of the stop rod is fixedly connected with an abutting plate, the abutting plate is "L"-shaped, one side of the abutting plate is fixedly connected with the stop rod, and the lower surface of the abutting plate abuts against the travel switch below when the stop rod is in the horizontal state.

4. The anti-falling device for home elevator maintenance according to claim 3, characterized in that: The stop rod is fixedly connected with a support plate which is perpendicular to the stop rod and is used for supporting the car, the support plate is perpendicular to the car guide rail, the support is provided with a gap for the support plate to pass through, and the gap is located between the fixing hole and the travel switch on the top.

5. A fall arrest device for use in the maintenance of a domestic lift according to claim 4, characterised in that: The side wall of the support is fixedly connected with a positioning pin, one end of the stop rod is provided with a through hole which extends along the thickness direction of the stop rod, and the stop rod is sleeved and rotationally connected on the positioning pin through the through hole.

6. A fall arrest device for use in the maintenance of a domestic lift according to any one of claims 1 to 5, characterised in that: The travel switch is a UKT automatic reset switch.

7. A fall arrest device for use in the maintenance of a domestic lift according to claim 6, characterised in that: The side of the support away from the car guide rail is provided with a reinforcing rib plate.

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