The design and analysis of single-point supported floating drive installation were carried out. Through these, the advantages of this installation can be initially understood: the method for determining the ideal floating support point, the calculation of the floating support point and the constraint reaction force N0, N1 of the transmission drum shaft at the free end of the suspension arm in the practical floating support drive installation, as well as the influence of different assembly methods on the constraint reaction force. The gears of ZLYJ reducer are made of high-strength low-carbon alloy steel through carburizing and quenching. The tooth surface hardness is high, and the gears are processed by CNC grinding technology, with high precision, good contact, high transmission efficiency, stable operation, and low noise. The volume is small, the weight is light, the service life is long, and the bearing capacity is high. It is easy to disassemble and install. The important point is that the rotation reducer shaft and the drum shaft have a significant impact on the service life of the reducer due to the incorrect deviation of the shaft, which affects the service life of the bearings and internal gears, and the transmission efficiency.

In the connection between the drive drum of the belt conveyor and the rotating reducer (such as gear reducer, worm reducer, etc.), if a fixed coupling is used, due to manufacturing and installation errors, the working load causes the shaft and the bearing to deform, temperature influence, and other unbalanced factors all seriously affect the alignment between the drum shaft and the reducer shaft. However, using a movable coupling allows for axial displacement, but radial displacement and other deviations will also generate additional load on the shaft and the bearing. Therefore, we have drawn lessons from domestic and foreign experiences.

2 Determination of the ideal floating support position

The so-called ideal position is the position of the single-point support of the belt conveyor in the normal working state, where the transmission drum shaft at the free end (except for the self-weight of the shaft) is only subjected to the torque M and not affected by other external forces.

That is, N0 = 0 (the self-weight of the shaft is omitted). The hard toothed reducer is widely used in metallurgy, mining, lifting, transportation, cement, construction, chemical industry, textile, printing and dyeing, pharmaceuticals, etc. Regarding the force conditions, the drum shaft is disconnected from D-D. The drive installation is taken as the balanced (Balance) isolator, that is, the object of our study. The force on this isolator:

W - isolator weight; A - the center position of the transmission drum shaft; N0 - the reaction force of the floating support point; B - the center position of the isolator weight; NA - the reaction force of the drum shaft support; M - external torque (opposite to n); O - support point position. Now let's look at the two situations when the external torque M is clockwise and counterclockwise (in this installation, W = 27.5 kN, M = 2.65 kNm, L = 0.275 m, L = 0.07 m, L3 = 0.205 m)

( ) When the external torque M is counterclockwise, M0 = 0WL2 - M = 0L2 = 0.46 m. Thus, it can be seen that whether the external torque M is clockwise or counterclockwise affects the position of the ideal floating support point O (in this installation, W = 27.5 kN, M = 2.65 kNm, L = 0.275 m, L = 0.07 m, L3 = 0.205 m)

( ) When the external torque M is clockwise, M0 = 0WL2 - M = 0L2 = 0.46 m. 3 N

A. Calculation of NO

Floating support construction method. Due to design requirements, the floating support points have been determined. They are not the points that are definitely ideal positions, so for NO, the following two situations are calculated in detail.

3. When the external torque M is the same, different assembly methods have different effects on NO and NA

If the components such as the motor reducer (including gear reducers, worm reducers, etc.) and the drum are exactly the same, the magnitude and direction of the external torque M are also the same. Different assembly methods will result in different constraints on the reaction force N

O and N at the floating support point and the free end of the drum shaft.

From the above analysis and calculation results, it can be seen that for the same belt conveyor, using the same single-point floating drive installation with a hard toothed reducer, the price of the hard toothed reducer, it is a device that transmits power by using a speed converter of gears, reducing the rotational speed of the motor to the required rotational speed and obtaining a larger torque. Different assembly methods will result in different constraints on the reaction force N

A, NO at the floating support point and the free end of the drum shaft. In the ideal state, NA = 0, but due to structural limitations, especially the floating support we designed, it is unlikely that NA = 0. However, we hope that the value of NA is as small as possible. Therefore, in the design process, it is necessary to consider and calculate which assembly method is more advantageous.

3.2 Calculation when the direction of the external torque M is different under the same assembly method

From the above calculation results, it can be seen that once the floating support position is determined in the structure, whether the direction of M is clockwise or counterclockwise has a direct impact on the constraints on the reaction force N

A, NO at the free end of the transmission drum shaft and the floating support point.

4. Advantages

This drive installation eliminates the coupling between the transmission drum shaft and the output shaft of the reducer (including gear reducers, worm reducers, etc.). Instead, the final gear of the motor reducer is mounted on the drum shaft. The floating drive installation has the following advantages compared to the traditional drive installation:

(1) The floating support requires that the final gear of the reducer be mounted on the transmission drum shaft, which solves the problem of different centers of multiple support points between the drum and the reducer. Thus, the precision requirements for the installation are greatly reduced.

At the same time, the installation speed is improved.

(2) Since the coupling between the transmission drum and the reducer is removed, the additional force caused by manufacturing errors of the device is greatly reduced. The transmission accuracy is improved.

(3) Due to the change in belt tension and the vibration caused by manufacturing errors of the drive installation, it will not be transmitted to the foundation, thus having a shock absorption effect.

It can prevent the occurrence of broken shaft mechanical accidents, which traditional transmission cannot eliminate. Due to the production and manufacturing errors of the drive installation frame, it affects the installation and service life of the coupling. Thus, it can better improve the service life of the drum shaft. The motor reducer is installed on the drive installation frame. The production and manufacturing errors of the transmission drum bracket also affect the alignment between the output shaft of the reducer and the output shaft of the drum. The additional force NA = 4.34KN and 5.5KN mentioned in this article are both to illustrate the intention of making NA as small as possible, so that the torque applied to NA is minimized and it is no longer subjected to bending moments.