How to adjust the accuracy of precision planetary reducer?

1.Adjustment of spindle rotation accuracy of precision planetary reducer.

The rotation accuracy of the spindle refers to the radial circular runout, end face circular runout and axial motion of the working parts in front of the spindle. To a large extent, the rotation accuracy of the spindle of the reducer is determined by the bearing on the premise of ensuring that the machining error of the spindle meets the requirements.

The key to adjusting the spindle rotation accuracy is to adjust the clearance of the bearing. Maintaining a reasonable amount of bearing clearance is important for the performance and bearing life of the spindle components. In the case of rolling bearings, the use of large clearances not only results in the concentration of the load up and down on the rolling element in the direction of the force, but also causes severe stress concentrations at the contact between the raceways of the inner and outer rings of the bearing.

This phenomenon shortens the service life of the bearing, and also causes the drift of the spindle centerline, which is prone to vibration of the spindle components. Therefore, it is necessary to pre-load the adjustment of the rolling bearing, so that the interference generated inside the bearing causes the elastic deformation of the rolling element and the contact between the raceways of the inner and outer rings to improve the rigidity of the bearing.

2.Adjustment of the gap between the screw and the nut of the worm hoist.

Secondly, the transmission chain in general mechanical equipment is composed of gears and gears, gears and teeth, worm gears and worms, wire strips and nuts and other transmission pairs. The spiral nut drive of the screw lift table is a common mechanism to achieve linear motion. It is difficult to have no gaps between the screws and nuts.

Especially after using the phase, due to wear, the gap will increase, affecting the normal operation of the equipment. Therefore, during the repair of the equipment, care must be taken to eliminate the gap between the screw and the nut.

3.Adjust the guide guide accuracy.

The guiding accuracy of the guide rail refers to the accuracy of the motion trajectory of the moving parts of the mechanical equipment when moving along the guide rail. The factors that affect the accuracy of the guide rail, in addition to the type, combination form and size of the guide rail selected in the design, the main factors common in equipment maintenance are:

1) Affected by the appropriate clearance of the guide rail.

2) It is affected by the stiffness of the guide rail itself.

3) Affected by the geometric accuracy of the guide rail.

Adjustment of the rotation accuracy of the spindle of the Buckman planetary reducer.

If the machining error of the spindle itself meets the requirements, the rotation accuracy of the spindle of the reducer is generally determined by the bearing. The key to adjusting the rotation accuracy of the spindle is to adjust the bearing clearance.

Maintaining a proper bearing clearance is critical to the performance and bearing life of the spindle components. For rolling bearings, when there is a large clearance, not only will the load be concentrated on the rolling element in the direction of force, but also will produce serious stress concentration at the contact between the raceway of the inner and outer rings of the bearing, shorten the life of the bearing, and also make the center line of the spindle drift, which is easy to cause the vibration of the spindle components.

Therefore, the adjustment of the rolling bearing must be preloaded, so that a certain amount of interference is generated inside the bearing, so that a certain elastic deformation is produced at the contact between the rolling element and the inner and outer ring raceways, so as to improve the stiffness of the bearing.

Dear, hello, planetary reducer and ball reducer are both in the reducer submachine machinery"Boutique"Oh. First of all, the design of the planetary reducer is composed of the sun gear stationary on the central axis and a plurality of planetary wheels rotating around the sun gear, which has the advantages of high precision, high efficiency and high torque, and is widely used in industrial machinery, machine tools, automatic Qibihua production line and other fields. However, the design of the spherical speed reduction speed machine adopts the cycloid support outside the ball, and the power transmission is realized through the contact between the ball and the cycloid, which has a lower cycloidal factor and higher torque density, and is suitable for high-precision, high-torque, and small-spacing deceleration transmission.

In summary, if you need high-precision and high-torque transmission, the ball reducer is a better choice; If you need high efficiency, miniaturization and low noise, planetary reducers may be more suitable. I hope it will be helpful for you to compile your answers.

Pro, between the planetary reducer and the ball reducer, the accuracy of the planetary reducer will generally be higher. This is because the structural design of the planetary reducer is more compact and rigid, and the use of multi-gear transmission and multi-point contact technologies makes it have higher transmission efficiency and bearing capacity, and can also reduce the deformation and deviation of the gear in the gear transmission, so as to improve the accuracy. In addition, the weight and volume of the planetary reducer are relatively small, and a larger reduction ratio can be achieved in a smaller space, so in some occasions with higher requirements for precision and space, such as machine tools, robots, automated production equipment and other fields, the planetary reducer has been widely used.

However, spherical reducers also have their advantages, such as smooth torque, low noise, good durability and other characteristics, and also have certain applications in some specific fields.

Accuracy of planetary reducer:

The general accuracy is 5 to 6 points, and the higher accuracy can be 3 points.

Accuracy calculation method of planetary reducer:

The accuracy unit of the planetary reducer is arc minutes, the shaft rotates 360 degrees, one degree = 60 arc minutes, the measurement method is to fix the input end of the reducer, and the output end is in the forward and negative directions plus 20% of the rated torque The degree of rotation of the output shaft can be calculated according to the things connected to your output end (wheel or screw rod, etc.) and your final accuracy requirements.

The general accuracy is 5 to 6 points, and the higher accuracy can be 3 points.

1. Define the calculation method: reduction ratio = input speed output speed. Refers to the ratio of the input speed and the output speed of the connection, if the input speed is assumed to be 1500r min, and its output speed is 25r min, then its reduction ratio is:

i=60:1。

2. Gear train calculation method: reduction ratio = number of driven gear teeth number of driving gear teeth (if it is a multi-stage gear reduction, then the number of driven gear teeth and the number of driving gear teeth of any pair of gear sets that can be meshed together, and then the results can be multiplied.)

3. Calculation method of reduction ratio of belt, chain and friction wheel: reduction ratio = diameter of driven wheel and diameter of driving wheel.

1.Static measurement: It refers to the measurement of the hysteresis of the output end on the rotation angle when the direction of motion changes from the definition of the precision reducer in the stationary state, mainly including the polyhedral method and the hysteresis curve method.

2.Polyhedral method: the angle measuring device, self-collimating collimator, multi-faceted prism and the like are used to measure the return difference of the precision reducer, the goniometric device is installed on the input shaft during measurement, and the angle of the input shaft is collected through the acquisition card, the polyhedral prism is fixed on the output shaft, one face of the vertical polyhedron of the self-collimating collimator is adjusted, and the polyhedron is observed and positioned.

When the forward rotation of the input shaft is changed to reverse rotation, the difference between the two limit rotation angles divided by the transmission ratio is the output shaft difference.

3.Dynamic measurement: refers to the dynamic continuous measurement of the return difference of the precision reducer in the operating state close to the precision reducer, and the main measurement method is the bidirectional transmission error method.

4.Hysteretic curve method: due to the coupling effect of internal clearance, elastic deformation, friction, etc., the hysteresis characteristics are common in precision reducers, which are usually manifested as the inconsistency of the corresponding output of the system in the forward and reverse strokes, and the clearances shown in the reducer and gear auxiliary transmission can be regarded as a special case of hysteresis phenomenon.

At present, researchers mainly analyze and model the hysteresis characteristics of precision reducers from the perspective of motion control. In the industrial field, the hysteresis curve method is usually used to measure the return difference of the precision reducer, and the geometric return difference of the precision reducer is defined as: when 3% of the rated torque is applied to overcome the internal friction and oil film resistance, and the parts are in good contact, the output shaft rotation angle value caused by geometric factors such as tooth side clearance and bearing clearance in the transmission chain, also known as idle return or clearance return.

When measuring, one end of the precision reducer is locked, and the other end is loaded to the rated torque in a positive gradient, and then the gradient is unloaded; In the same way, reverse gradient loading and unloading are done, torque and torsion angle signals are collected in real time, and hysteresis curves are plotted.

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First, the choice of the speed ratio of the planetary reducer:

When choosing a planetary reducer, first of all, the reduction ratio should be clarified, after determining the reduction ratio, please multiply the rated torque of the servo motor you choose by the reduction ratio, and the value obtained should be less than the rated output torque of the similar reducer provided by the product sample in principle, and also consider the overload capacity of the drive motor and the maximum working torque required in practice. The maximum operating torque required should be less than 2 times the rated output torque.

Second, the choice of the accuracy (return clearance) of the planetary reducer:

The accuracy measurement method of Bapman planetary reducer is:

1.Measurement method.

2.Polyhedral method.

3.Dynamic measurements.

4.Hysteresis curve method.

Hello landlord:

The accuracy of the planetary reducer refers to the return clearance. The unit is arc minutes.

Measurement method: When the input end is fixed, and the output end rotates clockwise and counterclockwise, so that the output end produces a rated torque of 2% torque, the output of the reducer has a small angular displacement, and this angular displacement is the return clearance.

arcmin. 1arcmin is equal to (1 60)°. That is to say, if the return clearance is 1arcmin, the angular deviation of the output is (1 60)° after one rotation of the reducer.

In practice, this angular deviation is related to the diameter of the output.

b = 2 · r · 360° If a gear with r = 60mm is installed on a reducer with a return clearance of 3arcmin, the deviation of one revolution of the reducer is.

The accuracy of the planetary reducer includes two kinds, one is the angular transmission accuracy, which will be marked in the planetary reducer manual, which can affect the absolute positioning accuracy of the robot; Another species is the repeated positioning accuracy, which is not in the planetary reducer manual, which can affect the repeated coarse chain position accuracy of the robot. Generally, planetary reducer manufacturers have professional equipment to measure angular transmission accuracy and repeated positioning accuracy, but customers can also design some simple friction methods to measure.

There are two kinds of accuracy errors, one is the cumulative error and the other is the return difference.

A good reducer has no cumulative error, and there will be a low-cost planetary reducer in some occasions where the accuracy is not high, with a nominal speed ratio of 5, and the actual speed ratio seems to be infinite without circulation, and in this case there will be a cumulative error.

Return gap, also called reverse clearance, return clearance.

If there is no seamless combination between the teeth, there must be a gap to let the tooth contact surface roll freely, and there is no error when this gap runs in one direction, but when it is reversed, there is a lag in the rotation angle.

The return difference of the eccentric shaft gearbox is said to be 3 degrees, but it is actually between 3 and 15 degrees.

The return difference of the domestic worm gear reducer is known as 15 points, in fact, professional manufacturers do not mark this parameter, because copper is easy to wear, and the inverting gap is constantly changing.

Planetary reducers are divided into powder metallurgy and alloy. The reverse clearance of powder metallurgy is 1 to 3 degrees (powder metallurgy says that 15 points is), the alloy gear grinding can be done for less than 10 minutes, and the hobbing of the gear is 15 minutes to 1 degree.