Fan blade anti-falling safety mechanism

Abstract

The utility model relates to a safety mechanism of an industrial fan, in particular to a safety mechanism of a fan blade. According to the fan blade anti-falling safety mechanism, fan blades are driven by an asynchronous motor, the asynchronous motor is installed in an installation cover shell, an output shaft of the asynchronous motor is downwards connected with a fan blade installation base plate, the fan blade installation base plate is an annular piece, and the annular piece is arranged in the middle of the output shaft and fixedly connected with the installation cover shell through bolts; the anti-falling safety mechanism is located outside the mounting housing and comprises a small safety ring arranged on an output shaft of the asynchronous motor in a sleeving mode and a large safety ring arranged on the fan blade mounting base plate in a sleeving mode, the small safety ring is fixed to the upper surface of the fan blade mounting base plate through a bolt assembly, and the large safety ring is fixedly connected with the lower surface of the housing through a sleeve bolt. The outer diameter of the small safety ring is larger than the inner diameter of the large safety ring, and the large safety ring and the small safety ring do not make contact during normal work. The fan blades are reliable in connection, and the risk of falling off is eradicated.

Description

Technical Field

[0001] The utility model relates to a safety mechanism of an industrial fan, in particular to a safety mechanism of a fan blade. Background Art

[0002] Industrial fans have a large weight due to their large dimensions. The length of the fan blades can reach more than three meters, and most asynchronous motors on the market have only one threaded hole at the end of the output shaft to fix the load. The motor used in industrial fans is installed vertically, and the load of industrial fans is relatively large. The axial fixation provided by a single bolt may not be enough to provide axial fixation with only one threaded hole, and there is a risk of falling off. Summary of the invention

[0003] The utility model aims to solve the above-mentioned defects of the prior art and provide a fan blade anti-falling safety mechanism. The fan blades of the utility model are reliably connected and the risk of falling off is eliminated.

[0004] The utility model discloses a fan blade anti-falling safety mechanism, wherein the fan blade is driven by an asynchronous motor, the asynchronous motor is installed in a mounting cover, the output shaft of the asynchronous motor is downwardly connected to a fan blade mounting chassis, the fan blade mounting chassis is an annular member, a ring member is provided in the middle of the output shaft, and is fixedly connected to the mounting cover by bolts, the anti-falling safety mechanism is located outside the mounting cover, and comprises a small safety ring sleeved on the output shaft of the asynchronous motor and a large safety ring sleeved on the fan blade mounting chassis, the small safety ring is fixed to the upper surface of the fan blade mounting chassis by a bolt assembly, the large safety ring is fixedly connected to the lower surface of the cover by a sleeve bolt, the outer diameter of the small safety ring is larger than the inner diameter of the large safety ring, and the large and small safety rings do not touch each other during normal operation.

[0005] The blade anti-falling safety mechanism also includes a tapered sleeve inserted from the bottom space of the blade mounting chassis and sleeved on the end of the output shaft. The inner diameter of the small safety ring is larger than the diameter of the small end of the tapered sleeve, and the shaft end is fixed and closed with an axial end cover by bolts.

[0006] In the fan blade anti-falling safety mechanism, the large safety ring is fixed to the motor mounting cover, and the small safety ring is fixed to the motor main shaft and rotates with the motor main shaft.

[0007] In the blade anti-falling safety mechanism, the bolts connecting the annular member and the mounting cover, the sleeve bolts connecting the large safety ring and the mounting cover, and the bolts fixing the axial end cover and the output shaft are all screwed in from bottom to top.

[0008] The motor of the utility model is installed in the flange hole on the motor mounting cover, and the large safety ring is inserted into the motor output shaft after the small safety ring is sleeved on the motor output shaft, and then the fan blade mounting chassis, the conical shaft sleeve, and the axial end cover are sleeved in sequence, and the small safety ring, the fan blade mounting chassis, the conical shaft sleeve, and the axial end cover are flange-fastened together with a bolt assembly to clamp the motor output shaft, and then the axial end cover and the motor output shaft are fastened with a bolt, and the bolt sleeve is installed between the corresponding bolt holes on the motor mounting cover and the large safety ring, and the bolt assembly is passed through the bolt sleeve to fasten the motor mounting housing and the large safety ring. When the fan blade mounting chassis and the conical shaft sleeve are not tightened on the motor output shaft and the screws at the end of the motor output shaft are loose, the fan blade mounting chassis will fall due to gravity, and the small safety ring will be stuck in the large safety ring and will not fall, which is safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The utility model is further described below in conjunction with the accompanying drawings:

[0010] Figure 1 It is a cross-sectional schematic diagram of the utility model;

[0011] Figure 2 yes Figure 1 Enlarged view of part A in the middle. DETAILED DESCRIPTION

[0012] See also Figure 1-Figure 2 , a fan blade anti-fall safety mechanism, the fan blade is driven by an asynchronous motor 1, the asynchronous motor is installed in a mounting cover 2, the output shaft 4 of the asynchronous motor is downwardly connected to the fan blade mounting chassis 3, a ring member 41 is provided in the middle of the output shaft and is fixedly connected to the mounting cover 2 by bolts, the fan blade mounting chassis is an annular member, the anti-fall safety mechanism includes a small safety ring 5 sleeved on the output shaft of the asynchronous motor and a large safety ring 6 sleeved on the fan blade mounting chassis, the small safety ring is fixed to the upper surface of the fan blade mounting chassis 3 with a bolt assembly 10, the large safety ring is fixedly connected to the lower surface of the cover with bolts and a sleeve 7, the outer diameter of the small safety ring is larger than the inner diameter of the large safety ring, and the large and small safety rings do not touch during normal operation.

[0013] The blade anti-falling safety mechanism also includes a tapered sleeve 8 inserted from the bottom space of the blade mounting chassis and sleeved on the end of the output shaft. The inner diameter of the small safety ring is larger than the diameter of the small end of the tapered sleeve, and the shaft end is fixed and closed with an axial end cover 9 by bolts.

[0014] In the blade anti-falling safety mechanism, the bolts connecting the annular member and the mounting cover, the sleeve bolts connecting the large safety ring and the mounting cover, and the bolts fixing the axial end cover and the output shaft are all screwed in from bottom to top.

[0015] In the fan blade anti-fall safety mechanism, the large safety ring is fixed to the motor mounting cover, and the small safety ring is fixed to the motor main shaft and rotates with the motor main shaft. When the fan blade mounting chassis and the conical shaft sleeve do not clamp the motor output shaft and the screws at the motor output shaft end are loose, the fan blade mounting chassis will fall due to gravity, and the small safety ring will be stuck in the large safety ring and will not fall, effectively preventing the safety hazard of the fan blade mounting chassis falling due to gravity when the fan blade mounting chassis and the conical shaft sleeve do not clamp the motor output shaft and the screws at the motor output shaft end are loose.

Claims

1. A fan blade anti-falling safety mechanism, wherein the fan blade is driven by an asynchronous motor, the asynchronous motor is installed in a mounting housing, the output shaft of the asynchronous motor is downwardly connected to the fan blade mounting chassis, the fan blade mounting chassis is a ring-shaped member, characterized in that: An annular member is provided in the middle of the output shaft and is fixedly connected to the mounting cover by bolts. The anti-fall safety mechanism is located outside the mounting cover and includes a small safety ring sleeved on the output shaft of the asynchronous motor and a large safety ring sleeved on the fan blade mounting chassis. The small safety ring is fixed to the upper surface of the fan blade mounting chassis with a bolt assembly, and the large safety ring is fixedly connected to the lower surface of the cover with a sleeve bolt. The outer diameter of the small safety ring is larger than the inner diameter of the large safety ring. During normal operation, the large and small safety rings do not contact each other.

2. A fan blade anti-falling safety mechanism according to claim 1, characterized in that: It also includes a tapered sleeve inserted from the bottom space of the fan blade installation chassis and sleeved on the end of the output shaft. The inner diameter of the small safety ring is larger than the diameter of the small end of the tapered sleeve, and the shaft end is closed by an axial end cover fixed by bolts.

3. A fan blade anti-falling safety mechanism according to claim 1 or 2, characterized in that: The large safety ring is fixed to the motor mounting cover, and the small safety ring is fixed to the motor main shaft and rotates with the motor main shaft.

4. A fan blade anti-falling safety mechanism according to claim 1, characterized in that: The bolts connecting the annular member and the mounting cover, the sleeve bolts connecting the large safety ring and the mounting cover, and the bolts fixing the axial end cover and the output shaft are all screwed in from bottom to top.

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