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Issue 140: Hengyu Guoqiang parallel shaft reducer motor with locking plate insta

Time：2019-03-19 | Source：恒宇国强 | Browse：1762001

The structure, principle and installation points of parallel shaft deceleration motor with locking plate are introduced in detail. It avoids the insufficient fixing or excessive restriction of the deceleration motor during installation, slows down the excessive impact caused by the collision of steel plate, the speed change and reverse of roller table, thus prolonging the service life of the deceleration motor and roller table; Parallel shaft deceleration motor with locking plate can transmit large torque, easy to install and dismantle, simple maintenance, and no equipment failure has occurred after more than 2 years of operation.

Locking plate parallel shaft reducer

Preface the wide and heavy plate production line was upgraded in 2014. The roll cutting bilateral shear and the input and output roller tables are updated equipment. In order to ensure the construction period and save the investment cost, the foundation of the input and output roller table (about 70 m long and 5 m wide) and the anchor bolts are used; In order to make the best use of the original foundation and anchor bolts and ensure the use function of the equipment, fh97 type parallel shaft reducer motor with locking plate is selected to implement single roll drive for the roller table. This type of reduction motor does not need a separate anchor bolt, but uses the torque arm to connect and fix with the roller support, and the reduction motor and the roller shaft transmit torque through the locking plate.

The input shaft and output shaft of the parallel shaft reduction motor are arranged in parallel, as shown in Figure

1. The output shaft is a hollow shaft, and the locking disc is installed on the hollow shaft of the reduction motor. The reduction motor is connected and fixed with the roller table support through its own torque arm. The installation and positioning are simple, but there are strict requirements; If the reducer motor and roller support are improperly installed, excessive restraint, insufficient fixation or position deviation exceed the standard, the transmission of reducer motor and roller will be unstable and the service life of reducer motor and roller will be shortened; Improper installation of the locking plate will cause serious consequences such as uneven force on the locking screw, deformation and damage of the locking plate, rotation and wear between the roller shaft and the hollow shaft, so it must be tightened according to the installation steps and requirements.

2. The structure and working principle of the locking plate are shown in Figure 2. The locking plate is composed of threaded connecting flange, pressure flange, locking screw and open inner ring. Tighten the locking screw in the circumferential direction of the flange in order to compress the front and rear flanges with the open inner ring. The open inner ring shrinks and compresses the hollow shaft of the reducer, resulting in the deformation of the hollow shaft, Thus, the hollow shaft is tightly connected with the roller shaft through the static pressure friction to transmit the torque.

Working principle of locking disc

3. Installation of parallel shaft reducer motor with locking plate and Roller Table

3.1 installation sequence

Firstly, the reduction motor is installed on the roller shaft which has been aligned and fixed; Then connect and fasten the reduction motor with the roller support; Finally, tighten the locking plate screw to make the roller shaft closely connected with the hollow shaft of the reducer motor.

3.2 assembly methods and requirements of reduction motor and roller shaft

(1) as shown in Figure 3, first loosen the locking plate screws sleeved on the hollow shaft of the reducer, but do not completely disengage them to ensure that the roller shaft penetrates smoothly.

(2) the roller shaft and hollow shaft shall be thoroughly cleaned without grease, oil, dust and other dirt

(3)When installing the reducer motor, as shown in Figure 4, apply the matching grease on the roller shaft corresponding to the hollow shaft bushing position. The clamping area between the roller shaft and the hollow shaft hole in the locking plate must be kept clean, and the grease cannot be adhered to ensure the safe and reliable transmission of torque, and the grease cannot be applied on the front bushing of the hollow shaft, In order to prevent the grease from penetrating into the clamping area of the locking plate inside the hollow shaft hole when installing the shaft.

(4) after the reducer motor and roller shaft are installed in place, install the locking plate at the position 1-2 mm away from the reducer, as shown in Figure 7. After the reducer motor and roller support are fixed, tighten the locking plate screw.

3.3 fastening methods and requirements for the connection between reduction motor and roller support the connection and fixation between parallel shaft reduction motor and roller support is very important. Because the motor needs to start, change speed and brake frequently during the operation of the roller table, the pre tightening rubber cushion assembly is selected to fasten the reducer motor. As shown in the D-D sectional view in Figure 5, the torque arm of the casting box of the reducer is connected with the roller support through a pair of rubber buffers and bolt components. The tightening of the bolts and rubber buffers must reach the required preload, so as to balance the torque change during the speed regulation and reverse starting of the roller, reduce the impact and vibration, and extend the service life of the roller and the reducer motor. According to the sequence of the positions shown in the D-D section view in Figure 5, connect the torque arm of the reducer motor with the roller support through bolts, large gaskets and a pair of rubber buffers, and then fasten the bolts with double nuts and prevent loosening.

3.4 installation and fastening methods and requirements of locking disc the locking disc shall be fastened after the reduction motor and roller table support are installed and fixed

1.Refer to the operation manual

(1) according to the reducer model to determine the bolt tightening torque. The reducer model is fh97 and the tightening torque of each bolt is 30 nm

（ 2) Referring to Fig. 6 (a) and (b), use torque wrench to tighten the locking bolts in circular order. Do not tighten the bolts crosswise or diagonally. The tightening angle is ≤ 60 ° each time. Tighten the bolts in clockwise direction until each bolt reaches the required tightening torque of 30 nm.

(3) refer to figure 7, after the locking plate is installed and tightened, ensure that the distance from the locking plate to the reducer box is 1-2 mm, the flange of the locking plate is parallel and the spacing is greater than 0 mm, so as to obtain reliable locking torque

4. Application of parallel shaft reducer motor with locking plate in wide and heavy plate line double side shear input and output roller table, there are a total of 70 motors with separate drive rollers, which can transport steel plate step by step, cooperating with double side shear cutting; It has been used safely for 30 months under the working conditions of frequent and fast start, acceleration, deceleration and braking. It is maintenance free and has no fault, and has achieved good results.

Installation of Locking Disc Reducer

5 Conclusion The parallel shaft reducer motor fixed by rubber buffer torque arm is installed according to the requirements, which can reduce excessive impact caused by slight collision of steel plate, speed change of roller, reverse rotation, etc., and avoid faults such as broken teeth of reducer, shaking of motor and bending of roller shaft; The parallel shaft reduction motor with locking disc has no keyway, but can transmit large torque, which is easy to install and disassemble and easy to maintain. The locking disc becomes an indispensable supplementary component of the parallel shaft drive motor.

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