Is it better to have more axes in a robot? - Epson

First of all, we need to correct this point of view, the more axes the robot has, the more sensitive it can reach the spatial position, but it certainly cannot be said that the more axes of the robot, the better.

The axis of the robot is commonly known as the joint, like the human arm, of course, the more joints the more sensitive, the more positions that can be rotated and reached, which seems to need no explanation!

Six-axis robot

However, we can't say that the more axes the robot has, the better, why? Let's explain it slowly!

The more robot axes, the more complex the robot control system, the higher its cost, the more points that can be reached in three-dimensional space, and the relative sensitivity This is undoubted, from this point of view, the more advanced the number of robot axes is correct, but it can't be said that the better, why?

6-axis welding robot + external axis = 7 axes

Case 1: Palletizing application. In the application of palletizing, the goods do not need to rotate in three dimensions, the goods themselves are only rotated horizontally, and the placement is only different from the front and back, so the four-axis palletizing robot is enough to complete these actions, if the six-axis robot is selected, it will increase the beat of the palletizing, the number of palletizing times of the four-axis palletizing robot is generally 1000 times/h, and the fastest KUKA six-axis robot is 700 times/h, and other six-axis robots with the same load are much more expensive than the four-axis, can we say that the six-axis is good?

Case 2: SCARA robot only has three axes, its operating range can only be in the horizontal plane, but the operation cycle is much faster than the operation cycle of any six-axis robot, the general SCARA robot XY axis composition speed can reach 5m/s, Z-axis (up and down) up to 1.6m/s, KUKA robot (the world's best robot) maximum linear speed is 2m/s, can we say that the more axes, the better?

Case 3

ELTA robot is a three-degree-of-freedom parallel connection, its operation cycle can reach several times per second, and the repeated positioning accuracy is much higher than that of the six-axis robot.

Is it better to have more axes in a robot? - Epson

Is it better to have more axes in a robot? - Epson

To sum up, it is advisable to choose the appropriate model for the purpose of industrial robots, and the robots are now classified according to different working conditions:

1. Palletizing, generally using a four-axis palletizer, has the advantage of large load and fast speed.

2. For general welding, a six-axis small load robot is generally selected, such as a 6kg robot, because the robot only needs to carry the welding torch and the wire feeder component, and the 6kg load is sufficient, and the difference in the selection lies in the length of the robot arm, that is, the operating range, which is commonly used to be 1200mm, 1400mm, etc.

3. Butt welding, such as spot welding of automobile shells, generally uses large-load six-axis robots, because the robot has to carry the welding clamp component.

4. Spraying, grinding, loading and unloading, etc. generally use six-axis robots, and robots with different loads and arm lengths can be selected according to working conditions and operating ranges.

5. SCARA robot is generally used for the installation of electronic devices, which has fast speed and high precision.

6. Delta robots are generally used for food packaging and sorting, and SCARA robots can also be used, with fast speed and high precision.

Therefore, at the level of industrial application in practice, it is not that the more axes, the better, but depending on the application of practice, some look at the speed, some look at the accuracy, some look at the load, some look at the arm length, different brands, the main direction of attack is also different, for example, the same brand, 165kg should be a little more expensive than the 50kg load robot, but some brands may focus on large loads, and 50kg robots are rarely produced, then his large load may be cheaper than a small load, The mass production is an important factor, so the selection of robots should be compared, especially this year, the emergence of domestic robots has also formed a certain impact on the entire market, we should have a correct understanding!

Make up the reply:

First, first explain the role of the lower axis

Several axes refer to the fact that the robot is composed of several active axes, that is, axes that can rotate around it.

The axis is closely related to the Kadir coordinate system. A three-axis robot, also known as a Cartesian or Cartesian robot, has three axes that allow the robot to move in the direction of the three axes; The six axes of the six-axis robot are the X Y Z axis in the Cartesian coordinate system, and the U V W axis that rotates around the X Y Z axis. At present, the number of axes on the market ranges from one to seven, and there are not only single-axis robots, but also seven-axis robots.

2. Single-axis robot

In China, it is also known as linear module, electric slide, etc., which is a mechanical structure that can supply linear motion, and at the same time, more complex operations can be completed through combination.

Advantages of single-axis robots:

1. The structure is simple, with the profile as the main body, the built-in guide rail screw and other transmission accessories are combined, and the linear structure determines that it can only complete the simple point-to-point movement.

2. No complex components, no need for long-term protection, usually only need to be smooth on time.

3. Usually the speed of the multi-axis robot we see is not too fast, but there are no problems in the single-axis robot, which is generally driven by a motor, and the speed is often several meters per second.

4. The shape of the single-axis slide table is linear, and the required stroke and installation method can be selected according to the practical situation, and the space is more sensitive than that of the multi-axis robot.

3. Confirm the number of shafts according to the demand

Multi-axis robots can complete fully automated operations through free programming, which can significantly reduce the output error rate.

However, it comes with high operating costs and relatively long programming and imitation before formal use, and it must also be guaranteed that there are no problems, otherwise the protection and maintenance costs during its use will not be low, and there must be professional engineers for protection.

At the same time, operators with multi-axis robots must also undergo long-term training to master, otherwise even a simple operation problem may lead to irreparable losses and even casualties.

Therefore, the more axes the robot is, the better, but it is still necessary to confirm it according to the practical content and environment of the robot operation.

Is it better to have more axes in a robot? - Epson

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