JPH0226251A - Method and device for attaching slit plate in rotor - Google Patents

Abstract

PURPOSE:To prevent a rotor from breakage and to dispense with a special technique in installation by providing a spigot joint worked section to the rotor, by fitting a slit plate to this spigot joint worked section and by fixing the slit plate to a rotation axis with a boss or a set screw. CONSTITUTION:A spigot joint worked section is provided to a boss 3 of an outer segmental fan 2 of a motor 1. A central hole 5 of a slit plate is fitted into this spigot joint worked section, to fitting holes 6 of which pins are fitted and installed. The boss 3 is then fitted into a rotation axis 7 of the motor 1 and secured there. In this way, a slit plate 4 is fixed to the rotation axis 7. By fixing a magnetic sensor 11 to the negative side of the motor 1 through a bracket 10 and by causing the negative side of the magnetic sensor 11 to face the slit of the slit plate 4, the number of revolutions of the slit plate 4 can be detected.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method and apparatus for attaching a slit plate to a rotating body for the purpose of fixing the slit plate to a rotating body of an electric motor or other industrial machine. be.

(Prior art) Conventionally, a rotary encoder 8 is attached to the rotating shaft 7 of the electric motor 1.
When installing the rotary encoder (FIG. 6), the rotary shaft 7 of the electric motor 1 was machined, and the rotary shaft 7 and the rotary encoder 8 were coupled and connected.

(Problems to be Solved by the Invention) According to the above-mentioned conventional technology, due to the thrust movement of the rotating shaft of the electric motor, a repetitive load is applied to the coupling.
Not only is there a risk of the coupling being damaged due to metal fatigue, but it is also difficult to achieve accuracy with respect to the rotating shaft, which also makes the coupling more likely to be damaged.
A high degree of skill was required when attaching it to an electric motor.

(Means for Solving the Problems) However, in the present invention, a spigot-processed part is provided on the rotating shaft, a slit plate is fitted and fixed to the spigot-processed part, and the rotational speed of the rotating shaft is determined by the slit plate and a magnetic sensor. The above-mentioned conventional problems have been solved by making the detection possible.

That is, the method of the present invention is a method for attaching a slit plate to a rotating body, which comprises performing a spigot process for fixing the slit plate on the rotating body, and fitting and fixing the slit plate for detecting pulses in cooperation with a magnetic sensor onto the eye part. It is. In the above,
The rotating body is the rotating shaft of an electric motor or the boss of an external fan. Further, the slit plate has slits provided at equal intervals on the outer peripheral edge of the disc or on the short cylindrical wall provided on the outer peripheral edge of the disc. The device of the present invention is a slit mounting device in which a boss of an external fan is machined with a spigot on the mounting side, a slit plate is fitted and fixed to the spigot-processed part, and the boss is fixed to a rotating shaft. In addition, in another device of the invention, an adapter boss is connected to a spigot-processed part provided at the end of the rotating shaft, a spigot-processed part is provided on the outer end side of the adapter boss, and a slit plate is fitted and fixed to the spigot-processed part. This is a slit mounting device. Furthermore, an invention that is not processed into a ready-made rotating body is a slit mounting device in which a slit plate is fitted into a spigot processing part provided at the end of a rotating shaft and fixed with a washer and a set screw.

(Function) That is, according to the present invention, a slit plate is fitted and fixed to the spigot processing part at the end of the rotating shaft, not only for a ready-made rotating body but also for a newly manufactured rotating body, and the slit plate and the magnetic sensor are connected to each other. By cooperating with the above, the rotation speed of the rotating shaft can be easily detected. Therefore, the installation work involves forming the spigot processing part,
Since it is only necessary to fit and fix the slit plate, it is possible to detect the rotation speed with high precision without requiring advanced technology, and there is no risk of failure even when used for a long time, and there is no problem with thrust movement of the rotating shaft. There is no effect.

(Example 1) Next, an example of the present invention will be described with reference to FIGS. 1, 3, and 4.

A spigot processing part 3a is provided on the boss 3 of the external fan 2 of the electric motor 1.
The center hole 5 of the slit plate 4 is fitted to the spigot processed portion 3a, and a bottle is fitted into the mounting hole 6 for installation. Next, the boss 3 is fitted and fixed onto the rotating shaft 7 of the electric motor 1. In this way, the slit plate 4 is fixed to the rotating shaft 7. A magnetic sensor 1 is installed on one side of the electric motor 111 via a bracket 10.
1 is fixed, and one side of the magnetic sensor 11 is attached to the slit plate 4.
By facing the slit of the slit plate 4, the number of rotations of the slit plate 4 (therefore, the number of rotations of the rotating shaft) can be detected.

The slit plate 4 has its outer peripheral edge bent to one side into a cylindrical shape to form a short cylindrical wall 4a, and a large number of slits 4 are formed in the short cylindrical wall 4a.
b are provided at equal intervals.

As described above, since the slit plate 4 is only interposed between the electric motor mi and the boss 3 of the external fan 2, there is no risk of increasing the axial length of the electric motor 1.

(Embodiment 2) Next, another embodiment of the present invention will be described based on FIG. 2.

A pilot processing part 12a is provided on the rotating shaft 12, an adapter boss 13 is fitted to the eye part, and this is fixed with a set screw 14. The slit plate 4 is fitted into the spigot-processed part 13a at the outer end of the adapter boss 13, and is tightened with the set screw 14 through the washer 15. In the figure, 10 is a holder, 11 is a magnetic sensor, and 18 is a housing.

(Example 3) Another embodiment will be described based on FIG.

A spigot-machined part 16a is provided at the outer end of the rotating shaft 16, and a slit plate 4 is fitted into the spigot-machined part 16a, and is fixed with a set screw 17 through a washer 15. The sensor 18 is a housing.

(Effects of the Invention) This invention provides a spigot-processed part on a rotating body (rotating shaft, boss, etc.), fits a slit plate into the spigot-processed part, and attaches the slit plate to the rotating shaft with a boss or a set screw. Since it is fixed, installation is simple and easy, and there is no risk of it being affected even if the rotating shaft is repeatedly moved by thrust or the like. With the above structure, there are various advantages such as there is no fear of damage even after long-term use, and no special techniques are required for installation.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of an embodiment of the present invention, Fig. 2 is an enlarged partial sectional view of another embodiment, and Fig. 3 is a view of the slit plate, and (2) is a side view. , w) is the front view,
((2) is a perspective view, and Figure 4 is also a diagram of the fan.
is an enlarged front view, (b) is an enlarged front view of the slit plate attached to the fan, Fig. 5 is a partially enlarged front view of another embodiment, and Fig. 6 is a partially cutaway front view of the conventional example. It is a diagram.

Claims (1)

[Scope of Claims] 1. A method for attaching a slit plate to a rotating body, characterized by performing a spigot process for fixing the slit plate on the rotating body, and fitting and fixing a slit plate that detects pulses in cooperation with a magnetic sensor into the part. 2. Method for attaching a slit plate to a rotating body according to claim 1, in which the rotating body is the rotating shaft of an electric motor or the boss of an external fan. 3. The slit plate is an outer peripheral edge of a disc, or a short cylindrical wall provided on the outer peripheral edge of the disc. Method 4 for attaching a slit plate to a rotating body according to claim 1, characterized in that the slits are provided at equal intervals. A spigot is machined on the mounting side of the boss of the external fan, and the slit plate is fitted and fixed to the spigot machined part. and a slit plate attachment device 5 for a rotating body, characterized in that the boss is fixed to a rotating shaft.An adapter boss is connected to a spigot processing portion provided at the end of the rotating shaft, and a spigot processing is performed on the outer end side of the adapter boss. 6 A slit plate attachment device for a rotating body, characterized in that a slit plate is fitted and fixed to the spigot-processed part provided at the end of the rotating shaft, and a washer and a set screw are fitted. Slit plate attachment device for a rotating body fixed by