A safety mechanism configured on an externally mounted tubular motor
By installing a safety bracket and a limit switch on the clutch sleeve of the tubular motor, the problem of the motor suddenly being powered on in manual mode when the power is off is solved, thus achieving safe motor operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG REROAD MECHANICAL & ELECTRICAL TECH CO LTD
- Filing Date
- 2025-07-04
- Publication Date
- 2026-07-07
AI Technical Summary
When the existing tubular motor is manually driven to run in the power-off state, the motor may suddenly be powered on and cause damage, posing a safety hazard.
A safety bracket is installed on the clutch sleeve, equipped with a limit switch and a flap. The power is cut off by pulling the flap with a chain to separate the contacts of the limit switch, ensuring that the motor is not powered when the power is off.
This effectively prevents the motor from suddenly energizing and operating in manual mode when power is off, improving safety and preventing motor damage.
Smart Images
Figure CN224473163U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of tubular motors, specifically to a safety mechanism configured on an external tubular motor. Background Technology
[0002] Tubular motors used in rolling doors sometimes lack a manual mode, which poses a challenge when opening and closing the door in the event of a sudden power outage. Others have a manual mode, but to prevent a sudden power restoration during manual operation, the motor power must be switched off to ensure safety. Otherwise, if the motor spindle is suddenly powered on while in manual mode, it could damage the motor and, in severe cases, endanger the operator. Summary of the Invention
[0003] The technical problem to be solved by this utility model is to provide a safety mechanism configured on an external tubular motor that can prevent the motor from being damaged due to sudden power-on when the motor spindle is driven in manual mode during a power outage.
[0004] The purpose of this invention is achieved as follows: Existing external motors all include a clutch sleeve, which is connected to the clutch cover base by screws. One end of the sprocket shaft is fitted with a bearing inside the clutch cover base, and the other end of the sprocket shaft is connected to the clutch mechanism inside the clutch sleeve. A sprocket is fixed on the sprocket shaft, and a chain is mounted on the sprocket. The clutch sleeve has an opening for the chain to protrude. In the event of a power outage, pulling the chain drives the sprocket shaft to rotate, which in turn drives the motor shaft to rotate through the clutch mechanism, thus opening and closing the roller door; these are all existing technologies.
[0005] This utility model includes a safety bracket, which is fixed near the opening of the clutch sleeve where the chain is exposed. A limit switch is installed in the middle of the safety bracket, and grooves are provided on the safety bracket on both sides of the limit switch. The chain is placed in the grooves on both sides of the limit switch.
[0006] The contacts of the limit switch face outwards, and the flap is hinged to the outer end of the safety bracket by a pin. A torsion spring is fitted on the pin, and the chain extending from the clutch sleeve abuts against the flap.
[0007] When stationary, the flap presses against the contacts of the limit switch; when flipped, the flap separates from the contacts of the limit switch.
[0008] The power supply is connected to the motor via a limit switch. The limit switch is a commercially available product.
[0009] The advantages of this utility model are: because it is equipped with a flap and a limit switch, the power supply is connected to the motor through the limit switch, and the flap and the limit switch contacts can be separated by pulling the chain. This can avoid the motor from being damaged by sudden power-on when the motor spindle is driven in manual mode during power failure. This improves safety. Attached Figure Description
[0010] Figure 1 This is a schematic diagram of the structure of this utility model;
[0011] Figure 2 This is a schematic diagram of the disassembled state of this utility model;
[0012] Figure 3 This is a schematic diagram of the clutch sleeve in this utility model;
[0013] Figure 4 This is a schematic diagram of the structure of the limit switch of this utility model. Detailed Implementation
[0014] The following is combined with Figure 1-4 The present invention will be further described below;
[0015] Existing external motors all include a clutch sleeve 1, which is connected to a clutch cover base 3 by screws. One end of the sprocket shaft 2 is fitted with a bearing inside the clutch cover base, and the other end of the sprocket shaft is connected to the clutch mechanism inside the clutch sleeve. A sprocket 4 is fixed on the sprocket shaft, and a chain 5 is mounted on the sprocket. The clutch sleeve has an opening for the chain to protrude. In the event of a power outage, pulling the chain drives the sprocket shaft to rotate, which in turn drives the motor shaft to rotate through the clutch mechanism, thus opening and closing the roller door.
[0016] This utility model includes a safety bracket 6, which is fixed at the opening of the clutch sleeve where the chain is exposed. A limit switch 7 is installed in the middle of the safety bracket. Grooves 61 are provided on the safety bracket on both sides of the limit switch. The chain 5 is placed in the grooves on both sides of the limit switch.
[0017] The limit switch contact 71 faces outward (the end away from the sprocket is the outer side), the flap 8 is hinged to the outer end of the safety bracket by the pin 9, and a torsion spring 10 is sleeved on the pin, that is, there are two hinge points between the flap and the pin, and a torsion spring is sleeved on the pin between the two hinge points; the chain extending out of the clutch sleeve abuts against the flap.
[0018] When stationary, the flap presses against the contacts of the limit switch; when flipped, the flap separates from the contacts of the limit switch.
[0019] The power supply is connected to the motor via a limit switch.
[0020] When the chain is pulled manually, the chain will press against the flap and cause the flap to flip outward. At this time, the flap separates from the contacts of the limit switch, the limit switch cuts off the power to the motor, the chain is released, and the flap returns to its original position under the action of the torsion spring, pressing against the contacts of the limit switch, and the motor is powered on.
[0021] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A safety mechanism configured on an external tubular motor, characterized in that: Includes a safety bracket (6), which is fixed near the opening of the clutch sleeve (1) where the chain is exposed. A limit switch (7) is installed in the middle of the safety bracket. Grooves (61) are provided on the safety bracket on both sides of the limit switch. The chain (5) is placed in the grooves on both sides of the limit switch. The contacts (71) of the limit switch face outwards, and the flap (8) is hinged to the outer end of the safety bracket by a pin (9). A torsion spring (10) is fitted on the pin, and the chain extending from the clutch sleeve abuts against the flap. The power supply is connected to the motor via a limit switch.
2. The safety mechanism configured on the external tubular motor according to claim 1, characterized in that: When the flap is stationary, it presses against the contacts of the limit switch; when the flap is flipped, it separates from the contacts of the limit switch.
3. The safety mechanism configured on the external tubular motor according to claim 1 or 2, characterized in that: The clutch sleeve (1) and the clutch cover base (3) are connected by screws. One end of the sprocket shaft (2) is fitted with the bearing in the clutch cover base, and the other end of the sprocket shaft is connected to the clutch mechanism in the clutch sleeve. A sprocket (4) is fixed on the sprocket shaft, and a chain (5) is installed on the sprocket.