Chain breakage protection mechanism for door operator

Abstract

The utility model relates to the technical field of protection mechanism, and the application provides a broken chain protection mechanism for door roller which prevents the door roller on the door roller from falling back when the chain of the door roller breaks, thereby avoiding the injury of the personnel below from the accident, it includes big sprocket, small sprocket, chain that sets up on big sprocket, small sprocket, big sprocket, small sprocket are all set up on mounting panel through pin shaft, sets up pin shaft between the connecting line of the axial line of big sprocket and small sprocket, pin shaft sets up on mounting panel, pin shaft is equipped with the arm of rotation on, is equipped with the gyro wheel on the other end of the arm of rotation far from pin shaft, the arm of rotation of near pin shaft end extends has the clamping tongue, the end of clamping tongue is not greater than the interval between two adjacent teeth of big sprocket, and the clamping tongue can be inserted between two adjacent teeth of big sprocket, still is equipped with torsion spring on pin shaft, and one end of torsion spring inserts into the hole of pin shaft shoulder, and the other end of torsion spring inserts into the hole of arm of rotation, it has the characteristics of high cost performance, the installation operation is not complicated, the quality consistency of product is high.

Description

Technical Field

[0001] This utility model relates to the field of protective mechanism technology, and in particular to the protective mechanism of a door opener. Background Technology

[0002] The function of a chain breakage protection device is to trigger the anti-chain breakage mechanism when the chain breaks, thereby preventing injury or damage to people or property caused by chain breakage. With the increasing prevalence of roller door motors, the use of chain breakage protection devices is also increasing. For example, patent CN201220163383.0, entitled "A Self-Locking Device for Roller Door Motors," provides a locking mechanism. However, this mechanism has several drawbacks: it consists of many components, requires precise dimensions, lacks accurate installation positioning, and exhibits poor product consistency. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a chain breakage protection mechanism for rolling door motors that prevents the rolling door on the motor from falling back when the chain of the door opener breaks, thereby avoiding accidents that could cause injury to people below. The product is precisely positioned and the components are easy to install.

[0004] The chain breakage protection mechanism for roller door motors is designed as follows: It includes a large sprocket, a small sprocket, a chain mounted on the large and small sprockets, and a mounting plate. Both the large and small sprockets are mounted on the mounting plate via a first pin. A second pin is positioned between the center lines of the large and small sprockets, with its center line perpendicular to the line connecting the center lines of the large and small sprockets. This second pin is mounted on the mounting plate. A rotating arm is mounted on the second pin, and a roller is located at the end of the rotating arm furthest from the second pin. The roller can rotate under external force. The rotating arm extends from the end near the second pin... The device features a latch, the tip of which is no larger than the distance between two adjacent teeth of the large sprocket, allowing the latch to engage with the space between two adjacent teeth of the large sprocket. A torsion spring is also installed on the second pin, with one end inserted into the hole in the shoulder of the second pin and the other end inserted into the hole in the rotating arm. When the chain contacts the roller on the rotating arm, the torsion spring is stressed, causing the latch on the rotating arm to move away from the large sprocket. When the chain breaks, the rotating arm rotates under the action of the torsion spring, and the latch engages with the space between two adjacent teeth of the large sprocket, preventing the large sprocket from rotating and thus preventing the rolling door from falling back down, avoiding potential hazards.

[0005] Based on the above, this utility model, through optimized design, installs the No. 2 pin on the line connecting the center lines of the large and small sprockets, thereby reducing the number of pins, holes on the mounting plate, and the number of welded pins. The new mechanism does not affect the performance of use. Therefore, it has the characteristics of high cost performance, simple installation and operation, clear product installation benchmark positioning, and high product quality consistency. Attached Figure Description

[0006] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0007] Figure 2 This is a diagram showing the usage state of the chain when it breaks in Embodiment 1 of this utility model;

[0008] Figure 3 This is an explosion diagram of Embodiment 1 of this utility model. Detailed Implementation

[0009] 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.

[0010] Example 1:

[0011] like Figure 1 , 3 As shown, this utility model discloses a chain breakage protection mechanism for a rolling door motor, including a large sprocket 10, a small sprocket 8, a chain 9 mounted on the large sprocket 10 and the small sprocket 8, and a mounting plate 1. Both the large sprocket 10 and the small sprocket 8 are mounted on the mounting plate 1 via a first pin. A second pin 2 is positioned between the axis lines connecting the large sprocket 10 and the small sprocket 8, with the center line of the second pin 2 perpendicularly intersecting the aforementioned axis line. The second pin 2 is welded and fixed to the mounting plate 1. A rotating arm 5 is mounted on the second pin 2, and the rotating arm 5 is fixed to the pin by a shaft retaining ring 4. A U-shaped groove is provided at the end of the rotating arm 5 away from the second pin 2. A roller 7 is riveted... The nail 6 is fixed in the U-shaped groove of the rotating arm 5. The roller 7 can rotate under external force. A latch extends from the end of the rotating arm 5 near the second pin 2. The end of the latch is no larger than the distance between two adjacent teeth of the large sprocket 10, that is, the latch can be inserted between two adjacent teeth of the large sprocket 10. A torsion spring 3 is also provided on the second pin 2. The shoulder of the second pin 2 and the rotating arm 5 are both provided with holes for fixing the torsion spring 3. One end of the torsion spring 3 is inserted into the hole of the shoulder of the second pin 2, and the other end of the torsion spring 3 is inserted into the hole of the rotating arm 5. When the chain 9 contacts the roller 7 on the rotating arm 5, the torsion spring 3 is stressed, and the latch on the rotating arm 5 moves away from the large sprocket 10. When the chain 9 breaks, as Figure 2 As shown, under the action of the torsion spring 3, the rotating arm 5 rotates, and the latch will engage between two adjacent teeth of the large sprocket 10, thus preventing the large sprocket 10 from rotating, so that the rolling door on the rolling door motor will not fall back, avoiding any potential hazards.

Claims

1. A chain breakage protection mechanism for a rolling door motor, comprising a large sprocket, a small sprocket, a chain mounted on the large sprocket and the small sprocket, and a mounting plate, wherein both the large sprocket and the small sprocket are mounted on the mounting plate via a first pin; characterized in that: A second pin is installed between the center lines of the large and small sprockets, with its center line perpendicular to the aforementioned center line. The second pin is mounted on a mounting plate. A rotating arm is mounted on the second pin, and a roller is mounted at the other end of the rotating arm away from the second pin. The roller can rotate under external force. A latch extends from the rotating arm near the second pin, with the tip of the latch not exceeding the distance between two adjacent teeth of the large sprocket, meaning the latch can be inserted between two adjacent teeth of the large sprocket. A torsion spring is also mounted on the second pin, with one end inserted into the hole in the shoulder of the second pin and the other end inserted into the hole in the rotating arm. When the chain contacts the roller on the rotating arm, the torsion spring is stressed, and the latch on the rotating arm moves away from the large sprocket. When the chain breaks, the rotating arm rotates under the action of the torsion spring, and the latch engages between two adjacent teeth of the large sprocket.

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