Many customers may be very familiar and prestigious with their professional machinery, but there are many deficiencies in the selection of reducers in Shanghai. Many are selected according to the most ambitious books or there are no unexpected conditions, so many decelerations have been caused. When the machine was in use, it did not meet its own expectations, so let me talk about how to choose the type of reducer that is suitable for you.
Try to choose an aspirational reduction ratio that is as close as possible:
Reduction ratio = motor speed / speed reducer output shaft speed
Torque calculation: For the life of the reducer, the torque calculation is very important.
And pay attention to the acceleration maximum torque value (TP), whether it exceeds the maximum load torque of the reducer.
The applicable power is generally the applicable power of the servo reducer models on the market. The applicability of the reducer is very high, and the operating coefficient can be maintained above 1.2, but in the selection, you can also decide according to your own needs:
There are two main points:
1. The output shaft diameter of the selected servo motor cannot be larger than the maximum shaft diameter on the table;
2. If the torque calculation is performed, the rotation speed can be satisfied with normal operation. However, when there is a lack of phenomenon when the servo is full output, you can use the drive on the motor side for current limiting control or torque protection on the mechanical shaft. It is necessary.
The selection of universal reducer includes the process of proposing original conditions, selecting types, and recognizing specifications.
In contrast, the type selection is relatively simple, and accurately supplying the working conditions of the reducer, and grasping the characteristics of the planning, production and operation of the reducer is the key to the correct selection of the specifications of the universal reducer.
Standard selection should satisfy the conditions such as strength, thermal balance, and radial load at the shaft extension.
The biggest difference between the general and special reducer planning and selection methods is that the former is applicable to various occupations,
However, deceleration can only be planned according to a specific working condition. Therefore, when selecting, users need to consider different correction factors according to their own requirements. The factory should use the motor power (not the rated power of the reducer) selected on the nameplate; According to the user's special conditions, the consideration factor is generally considered in the planning. When selecting, you only need to use the power that is less than or equal to the rated power of the reducer. The method is relatively simple.
The rated power of the universal reducer is generally based on the application (working condition) coefficient KA = 1 (the motor or steam turbine is the prime mover, the load on the work machine is stable, the operation is 3 to 10 hours per day, and the recommended number of times per hour is ≤ 5 times. 2 times the working torque), touch strength safety factor SH≈1, the probability of failure of a single pair of gears ≈1%, etc., as recognized by conditional accounting.
The rated power of the selected reducer should be satisfactory
PC = P2KAKSKR≤PN
Where PC——accounting power (KW);
PN——Rated power of reducer (KW);
P2——Working machine power (KW);
KA——Using coefficient, considering the influence of operating conditions;
KS——suggestion coefficient, considering the impact of the number of recommendations;
KR——Reliability coefficient, considering different reliability requirements.
The coefficients used by countries around the world are basically the same. Although the KS \ KR coefficients are not reflected in many samples,
However, due to confidants (clear requirements on their own working conditions) and knowing them (clear on the functional characteristics of the reducer), a large amount of wealth is generally left in foreign selection, which is equivalent to having considered the impact of KR \ KS.
Due to different application occasions, different degrees of importance, different sizes of personal safety and production loss after damage, and different ease of repair, the requirements for the reliability of the reducer are also different. The coefficient KR is the reliability required by practice to modify the reliability of the original plan. It complies with ISO6336, GB3480 and AGMA2001-B88 (Specifications of the American Gear Manufacturers Association) for the calculation of gear strength. Some domestic users ca n’t provide specific requirements for the reliability of the reducer. According to the planning rules of general special reducers (SH≥1.25, failure probability≤1 / 1000), more important occasions take KR = 1.25 = 1.56. .
Thermal balance check:
The allowable thermal power value of the universal reducer is under the specific working conditions (general ambient temperature 20 ° C, 100% per hour, continuous operation, power utilization rate 100%), according to the maximum equilibrium temperature allowed by the lubricant (generally 85 ° C) recognized. Different conditions
When correcting according to the corresponding coefficient (sometimes a composite coefficient).
The selected reducer should be satisfactory
PCt = P2KTKWKP≤Pt
Where PCt——calculated thermal power (KW);
KT——environment temperature coefficient;
KW——Coefficient of operation cycle;
KP——power utilization factor;
Pt——allowable thermal power of the reducer (KW).
The universal reducer often has to restrain the maximum radial load that the input shaft and output shaft can extend at the center of the shaft. It should be checked. When it exceeds the requirements, the manufacturer should ask the manufacturer to increase the shaft diameter and increase the bearing.
We hope that the above selection methods can help us. Wenzhou Xinjin Transmission Manufacturing Co., Ltd. warmly welcomes scientific research, planning, business, and people of insight to cooperate closely and work together.