The Nachi Spot Welding Robot SRA series has been upgraded

In recent years, under the background of rising labor costs in China and Southeast Asian countries, the demand for automated spot welding robotization has increased year after year. When commissioning a robot in a unit, you will encounter problems with handling the cables and hoses of the unit. These lines will slosh in response to the robot's movements, which can be difficult to take into account in the early discussion and simulation phases.

After the robot is set up, in order to solve the cables. The action vector of the hose disturbs the clamp and the surrounding instruments, and it is necessary to connect the device cable. Hose sloshing problems are confirmed in practice, and all this can take a lot of time with inexperience. As a result, the demand for robots built into cables is increasing.

In order to respond to such needs, NACHI has developed a new robotic arm with a hollow structure, and has fully upgraded the existing "SRA series" robots, and launched a device cable for spot welding. Four new models of robots with hoses built into the robotic arm.

The Nachi Spot Welding Robot SRA series has been upgraded

　　Overview of hollow robotic arms

1. Appearance and standard

There are two standards for the SRA series' hollow robotic arms, one is the "SRA100H" and "SRA133HL" for lightweight welding guns, and the wrist structure is supported on one side. The other is the "SRA220H" and "SRA220HV" for heavy-duty torches that cause high welding pressure, and the wrist structure is supported on both sides to cope with the heavy-duty torch. The four new models of robots store the device cables that are usually wrapped around the outside of the robotic arm inside the robotic arm, making the robotic arm more concise.

2. Compared with the previous A-Trac standard, the function has been upgraded

First of all, compared to the conventional standard, the wrist axis movement scale of the hollow series has been increased. In order to prevent disturbance with the jig, the conventional A-Trac standard robot will not be able to change the posture of the welding torch when the wrist reaches the limit of the scale of action, so welding cannot be performed. In the hollow series, there is no need to worry about this problem due to the increase in the scale of the wrist shaft action, so that the weldable scale is increased, and the programming correction is also easier.

Expertise of hollow robotic arms

In order to solve the problems of difficulty in entering the narrow space encountered in the practical use of standard robots in the past and the difficulty in confirming the scale of cable disturbance in advance, the upper robotic arm and wrist are planned as a hollow structure in the structure of the hollow robotic arm, and the device cable connecting the front end of the wrist to the welding torch and other tools is built-in. Finished with cables? The hose is agitated, and the reproducibility of offline programming is improved.

1. Progressively set the degree of freedom

"SRA100H/133HL" arm? The disturbance radius of the wrist is reduced by 30% compared to the previous A-Trac standard, and the arm undulation is reduced by 40%. "SRA220H/220HV" arm? The disturbance radius of the wrist is reduced by 27% compared to the previous standard, and the arm undulation is reduced

40% less. By compacting the arm, the progress of the robot placement density has been completed, and the problem that it is difficult for the previous standard robot to operate in a small space scale has also been solved. The ease of setting up has increased, and the process of introducing the robot has become more streamlined.

2. Shorten the installation time of production equipment

The built-in cable eliminates the problem of cable disturbance, and there is no need to re-correct the cable treatment after setting. In addition, in the past, in order to improve the reproducibility of offline work, it was possible to eliminate the actual machine verification and correction work of the work program. As a result, the time required to assemble the production equipment will be significantly shortened.

3. Improve trust

When using robots for welding work, it is possible to prevent cable damage caused by spatter during welding and disturbance of peripheral devices, which improves reliability. Also, the device cable that's hidden in the arm? The hose is modularized as a spare part, making maintenance smoother and easier, saving time for replacement.

4. The production line of the suspension device is upgraded

The most useful way to make the production line compact is to install a variety of equipment with three-dimensional and high-density equipment. To this end, the SRA Series has increased the arm length of the three models to meet customer needs. However, the 200kg weight class does not have the option of increasing the arm length. Therefore, in order to make the 200 kg class robot suitable for high-density equipment, NACHI upgraded the 200 kg class welding robot to a suspension device.

5. Commonality of spare parts

In order not to increase the burden on customers of the spare parts of the new hollow arm standard robot, the primary spare parts of the new standard robot, such as motor, lubricating oil, power supply, etc., are common to the previous standard "SRA series".

The newly developed SRA-H series of hollow arm structures has been upgraded to meet the emerging needs of our customers. In order to meet the different needs of various industries, it is necessary to continuously expand NACHI's product lineup. In the future, NACHI will accelerate the expansion of the robot product line and contribute to the fulfillment of the production line that customers are seeking.

The Nachi Spot Welding Robot SRA series has been upgraded

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