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ROBOTICS & HANDLING How grippers can automate a cleaning machine for sterile glass vials

Nov 2, 2021

Automation has taken sectors like pharma and medical by storm since machines could cut out risky as well as monotonous tasks while eliminating the risk of adultering the products. One such company, SEA electronics, was worried about the many successive stoppages of the washer while cleaning small vials. The case study explains how Zimmer Group’s French subsidiary – Zimmer Group France – ensured that SEA’s machine runs trouble-free while maintaining the cycle time and ensuring more productivity.

The introduction of modern automation technology into the sensitive production areas of pharmaceutical and medical technology was rapid. However, the conditions for the entry of systems, components and robots into this sector are anything but easy to meet. For example, systems for medical technology must, in most cases, meet demanding cleanroom classifications and the components must also be suitable for use under such adverse environmental conditions.

In the search for a new gripper solution for a newly developed application, which is a part of an automatic packaging line of a pharmaceutical company, a Tunisian automation specialist, SEA electronics, therefore, found what it was looking for at Zimmer Group France – a French subsidiary of the German Zimmer Group. This is because the company’s extremely broad product range includes several cleanroom-certified and cleanroom-suitable components, such as grippers and swivel units. The fact that the Tunisian automation specialist has already been working successfully with the French company on other projects for many years was a great advantage.

SEA electronics from Sousse - a port city and at the same time the third-largest city in Tunisia - was founded in 1994. Initially, the young company helped the local industry to increase its productivity. Relatively quickly, the company became successful and became a certified Siemens Solution Partner. A few years later, the company founded SEA Trading and SEA International to devote more attention to foreign projects.

Glass vials are cleaned automatically

But now back to the application: The original automated cleaning machine, which can clean small sterile glass bottles called vials, among other things, consisted of a rotary table and eight standard pneumatic rotary grippers from a market companion. By means of a filling device, the vials are filled with sterile water, reaching a rotary table for cleaning. Afterwards, the vials are grouped in fours and fixed by a gripper attached to a swivel unit. The gripper then rotates through 180° to empty the vials again. The turntable then moves to the second position. A cleaning process is started for the gripper or for the vials that hold with the opening pointing downwards. A washing needle penetrates the bottles and cleans them with a jet of water. The gripper then moves back to its starting position (180° turn in the opposite direction). In the last step, the gripper places the bottles on a conveyor line for the drying and product filling process.

Problems with downtimes

The Tunisians were particularly worried about the many successive stoppages of the washer due to alarms (malfunction of the encoder). During an inspection of the machine’s functional sequences, it was discovered that one of the grippers used was turning with difficulty, which jammed the transfer turret at the discharge guide and subsequently caused the machine to come to a standstill. After a precise diagnosis of the malfunction, for which the gripper had to be removed, the experts from SEA electronics had noticed signs of corrosion and rust on the bearings & inside the cylinder and could therefore conclude that the problem was primarily due to the gripper’s tightness. It was decided to replace the existing gripper with a new sealed gripper, which can ensure perfect functioning and adapt to the very humid climatic conditions of the washer. The Zimmer Group was able to score here with its pneumatic GPP5004N-21-A gripper.

Designed for universal use

The grippers of the GPP5000 series, with their robust, hard-coated steel-in-steel profile linear guide, were designed for true universal use. Depending on the variant, they have a number of features (speed, high gripping forces, long gripper jaw lengths) and thus offer the right solution for every application. When using a protector, the grippers have a sealing class of IP67 - ideal for use in cleanrooms or the damp ambient conditions of a cleaning machine.

The space available at the customer’s premises was limited, so a very compact design was required. Here, the Zimmer Group grippers, which feature a variety of detailed solutions and thus facilitate daily use, were able to gain further plus points by often eliminating the need for accessories. For SEA electronics, it was also not insignificant for the trouble-free operation of the machine that the GPP5000 grippers, with their low coefficient of friction and good emergency running characteristics, can handle 30 million cycles without maintenance.

Since the grippers must perform a rotary movement within the cleaning machine, the developers at SEA electronics also installed the flat swivel unit MSF44N-D2 from the Zimmer Group. The swivel unit ensures a gripper rotation of 180 degrees. With a weight of the gripper, jaws and the bottles of about 600 grams, this unit had to ensure the rotation in 0.2 seconds.

After successfully commissioning the bottle washer with the new grippers, Nouira Majdi of SEA electronics draws an all-around positive conclusion: “The machine runs well and is trouble-free. Our expectations of the grippers have been fully met. The speed or cycle time with the grippers from the Zimmer Group was identical to the previous models. Productivity has also increased significantly because there were no more machine stops”.

Courtesy: Zimmer Group

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