Device for improving stability of encoder in direct current speed regulation system of main winding motor

Abstract

The utility model discloses a device for improving the stability of an encoder in a direct current speed regulation system of a main winding motor, which comprises an encoder bracket fixed on the winding motor; the encoder is mounted on the encoder bracket; the coded disc is fixed on a rear shaft of the winch motor; and the shaft of the coded disc and the shaft of the encoder are connected together through the flexible coupling.

Description

Technical Field

[0001] This utility model relates to the field of electrical automation equipment technology, and in particular to a device for improving the stability of encoders in DC speed control systems of main winding motors. Background Technology

[0002] The hoist motor is a key piece of equipment in the blast furnace charging trolley, and the DC speed control device is the core component for speed regulation of the hoist motor. For stable production operation, a primary and backup control system is used. If the primary DC speed control device fails, it can immediately switch to the backup DC speed control device. Since one DC speed control device powers two primary hoist motors, and each primary hoist motor is equipped with a speed feedback encoder, serving as speed feedback for both the normal and backup cabinets, the encoder in the normal cabinet provides speed feedback when in operation. The backup encoder is used as a backup in real time. If the primary cabinet fails, the system immediately switches to the backup cabinet, and the backup encoder engages to participate in the speed regulation process. Therefore, the backup encoder plays a crucial backup role and must be activated immediately upon use. Failure to activate it is strictly prohibited.

[0003] Currently, the main winding motor lacks an output shaft at its rear end, making a flexible connection with the encoder impossible. A rigid connection using nylon rods and a fixed code disk is necessary. This compromises the concentricity of the encoder shaft and motor shaft during installation, leading to radial forces and potential fatigue fracture of the encoder shaft due to radial stress over long-term operation. Furthermore, this causes the DC speed control system of the main winding motor to malfunction, posing a risk of impacting blast furnace hoisting and potentially reducing oxygen levels in the blast furnace, lowering the blast furnace charge height to 4 meters. Such an event would result in significant economic losses for the company. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a device for improving the stability of the encoder in a DC speed control system for a main winding motor.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] An apparatus for improving the stability of an encoder in a DC speed control system for a main winding motor, comprising:

[0007] Encoder bracket, fixed to the hoist motor;

[0008] The encoder is mounted on an encoder bracket;

[0009] The encoder is fixed to the rear shaft of the hoist motor;

[0010] A flexible coupling connects the shaft of the code disk and the shaft of the encoder together.

[0011] This utility model also includes:

[0012] The hoist PLC control system is connected to the encoder speed signal output terminals of the DC speed control devices in the normal cabinet and the standby cabinet, and is also connected to the operator station signal via a switch.

[0013] The beneficial effects of this utility model are:

[0014] 1. This utility model improves the stability of the encoder in the DC speed control system of the main winding motor by using an encoder bracket and a PLC control system in cooperation, thus enabling stable feeding of material from the hoist trolley to the blast furnace. This device and method overcomes the risk of encoder shaft failure due to radial stress fatigue caused by the rigid connection between the nylon rod on the rear shaft of the hoist motor and the fixed code disk, which makes it impossible to ensure the concentricity of the encoder shaft and the motor shaft during installation. This leads to the encoder shaft breaking due to radial stress fatigue during long-term operation, causing the DC speed control system of the main winding motor to malfunction. This invention is of great significance for improving the stability of the encoder in the DC speed control system of the main winding motor and ensuring stable feeding of material to the blast furnace hoist.

[0015] 2. This utility model improves the stability of the encoder in the DC speed control system of the main winding motor by using an encoder bracket and a PLC control system in cooperation. It changes the encoder shaft connection of the main winding motor from rigid to flexible. The PLC control system collects the encoder speed signals of the DC speed control devices in the normal and standby cabinets of the winch motor. The program compares the speed difference between the normal and standby cabinet encoders, and promptly issues a screen alarm if the speed difference is too large, reminding maintenance personnel to check for encoder shaft breakage and proactively eliminate potential equipment hazards. This device and method overcome the risk of encoder shaft breakage due to the rigid connection between the encoder and motor shafts using a nylon rod and fixed code disk on the rear shaft of the winch motor, which makes it impossible to ensure the concentricity of the encoder shaft and motor shaft during installation. This radial force can cause the encoder to fracture due to radial stress fatigue during long-term operation, leading to the failure of the DC speed control system of the main winding motor. This utility model improves equipment safety and reliability.

[0016] 3. This utility model is a device that connects the speed feedback encoder shaft, which is fixed on the encoder bracket at the rear of the motor, via a flexible coupling. By collecting the encoder speed signals of the DC speed control devices of the normal and standby cabinets of the hoisting motor in the hoisting PLC control system, the program compares the speed difference between the encoders of the normal and standby cabinets. If the speed difference is too large, an alarm is triggered on the screen to remind maintenance personnel to check whether the encoder shaft is broken, thus eliminating potential equipment hazards in advance and ensuring stable feeding of materials from the hoisting trolley to the blast furnace.

[0017] 4. This utility model overcomes the damage to the encoder shaft caused by hard connections. By using a soft connection, it greatly improves the stability of the encoder in the DC speed control system of the main winding motor. Simultaneously, when the encoder speed difference is too large, an alarm pops up on the operator station screen via PLC, reminding maintenance personnel to check if the encoder shaft is broken. This is of great significance for the stable feeding of blast furnace hoists. Attached Figure Description

[0018] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a connection diagram of the hoist PLC control system of this utility model. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0022] like Figure 1 and Figure 2 As shown, a device for improving the stability of an encoder in a DC speed control system of a main winding motor includes: an encoder bracket 4, fixed to a winch motor 1; an encoder 5, mounted on the encoder bracket 4; a code disk 2, fixed to the rear shaft of the winch motor 1; and a flexible coupling 3 connecting the shaft of the code disk 2 and the shaft of the encoder 5 together. This invention also includes: a winch PLC control system 8, connected to the encoder speed signal output terminals of the normal cabinet DC speed control device 6 and the standby cabinet DC speed control device 7, and also connected to the operator station 9 via a switch 10.

[0023] In use, this invention first drills a hole in the rear shaft of the hoisting motor 1, and fixes the code disk 2 to the rear shaft of the hoisting motor 1 using a wire guide. Then, the encoder 5 is installed on the encoder bracket 4, and the shaft of the code disk 2 and the shaft of the encoder 5 are connected together using a flexible coupling 3. Finally, the encoder bracket 4 is fixed to the hoisting motor 1. After that, the encoder speed signals of the normal cabinet DC speed control device 6 and the standby cabinet DC speed control device 7 are collected through the hoisting PLC control system 8. A program is written in the hoisting PLC control system 8 to compare the speed difference between the two encoders. When the difference is greater than 0.5, a text alarm pops up on the operation screen. The hoisting PLC control system 8 communicates with the operator station 9 through the switch 10 to realize the encoder shaft breakage reminder to maintenance personnel to check and replace the encoder in time.

[0024] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for improving the stability of an encoder in a DC speed control system for a main winding motor, characterized in that, include: The encoder bracket (4) is fixed on the hoist motor (1); The encoder (5) is mounted on the encoder bracket (4); The encoder (2) is fixed to the rear shaft of the hoist motor (1); A flexible coupling (3) connects the shaft of the code disk (2) and the shaft of the encoder (5) together.

2. The device for improving the stability of the encoder in a DC speed control system of a main winding motor according to claim 1, characterized in that, Also includes: The hoist PLC control system (8) is connected to the encoder speed signal output terminals of the normal cabinet DC speed control device (6) and the standby cabinet DC speed control device (7), and is also connected to the operator station (9) via the switch (10).

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