Plant & Works Engineering November 2022

P ropagator firms germinate and grow plants until they are large enough to handle. These plants are then distributed to farmers, who grow and sell them to supermarkets. A propagator firm behind this process, John Gabbie & Sons based in County Down, Northern Ireland, has several glasshouses that germinate seeds into seedlings. These glasshouses are up to half an acre in size and split up into bays, which are up to ten metres wide and 16 metres long with walkways for forklifts and tractors to travel up and down on. For plant distribution, an operator needs to drive a tractor or a forklift along the pathway to move bays of plants through the glasshouses. The plants are then physically carried to the end of the bay, boxed and then sent out to farmers. As with many traditional farming practices, this process is labour intensive John Gabbie & Sons approached WEG’s premier distributor, Technidrive to develop an automated solution. Technidrive is an industrial drive provider, partnered with WEG supplying product lines such as variable speed drives, soft starters and energy efficient motors. For this project, Technidrive called upon the support of WEG to supply two braked motors and a variable speed drive (VSD), with a braking resistor and safe torque off (STO), an emergency stop function. This equipment is essential for the design and safety of an automated cart system, helping to transporting product up and down the glasshouses securely, while also ensuring seed growth. Equipment development At the start of the project, John Gabbie & Sons did not have an exact design in mind. The main requirements of the equipment were to save on space, increase efficiency and importantly, remove as much physical labour as possible. As the company’s first automation venture, the project would include automating only one of their glasshouses, with a long-term view of fully automating all glasshouses. Phase one of the project consists of an automated cart system that runs along railings in each walkway of the glasshouse. The cart also includes a sprayer that is mounted on the cart to feed the plants during cultivation. The cart being placed on railings removes the need for a walkway inside the glasshouses, which ran along the centre of the glasshouse. Instead, the cart carries a trolley to push onto the bay. Each bay is nine metres wide and carries several trays of plants, preventing an operator from needing a tractor, or a forklift, to reach the seedlings. Not only does this speed up the process, but it also allows the company to pack more product in the glasshouse. To make this feasible, Technidrive developed a control panel for the automated cart system. This includes joystick to drive and steer the cart, allowing an operator to control the motion of the cart when manoeuvring around the glasshouse. There are also switches on the panel for additional controls, such as lock in pins to stop the cart at a bay. Importantly, the automation enables an operator to move a batch of plants from the middle of a bay, without the physical labour of carrying them. An operator can simply drive the cart along the railings, before using the lock in pins — that extend into the ground — to park the cart at the specified bay. The operator can then push the trolley, which is also nine metre wide, to lift the tray of seeds and put them onto the cart — either to move it to a different position in the glasshouse, or to prepare them for distribution. Enhanced with automation WEG’s braked motors ensure the cart is safely secured into position, Process, Controls & Plant Focus on: Drives, Motors & Controls 26 | Plant & Works Engineering www.pwemag.co.uk November 2022 Bespoke automated cart system helps farming firm increase efficiency The humble potato has been voted as the UK’s favourite vegetable, according to a new public poll. But do you know how they end up on your plate? Here’s how industrial motor manufacturer, WEG has partnered with Technidrive to provide equipment for an automated cart system for plant propagator, John Gabbie & Sons, to help produce over 52 million seeds a year.