Flower Vending Machine Product

Overview

A flower vending machine is an automated kiosk that stores fresh cut flowers in a climate-controlled refrigerated cabinet (2–4 °C, 85–95% humidity), displays pre-arranged bouquets or allows customer customization via touchscreen, and mechanically retrieves and presents a selected bouquet at a customer-accessible window. The machine operates 24/7, providing convenient access to flowers for occasions (birthdays, anniversaries, apologies, condolences) outside traditional florist business hours.

The machine consists of six independent refrigerated compartments (lockable glass doors), each holding 3–4 pre-arranged bouquets. The Refrigeration System system maintains 2–4 °C, the optimal temperature for flower preservation (slowing petal aging and bacterial growth). The Humidity Control maintains 85–95% relative humidity via ultrasonic misting nozzles, preventing petal desiccation and wilting. When a customer selects a bouquet via the Customer Interface Display, the Master Control Board unlock the appropriate door and signal the Automated Bouquet Retrieval arm to remove the bouquet from its shelf holder. The arm transfers the bouquet to the Presentation Platform, which slides forward into a dispensing window. Optionally, the Protective Wrapping Roller wraps the bouquet in protective paper. Once the customer removes the bouquet, the tray retracts, the door locks, and the system readies for the next order.

These machines are deployed in hotels, hospitals, train stations, shopping malls, and florist shops as convenience retail points. The main engineering challenge is maintaining flower freshness and vibrancy in a fully automated, unattended environment, preventing water loss, and ensuring mechanical reliability with high-moisture ambient conditions.

How it works

The Refrigerated Cabinet Structure is a tall stainless steel locker with six independent compartments, each with its own glass door and locking mechanism. The interior is divided vertically into six sections. Within each section is a Stainless Shelf Unit, a sloped shelf (5° forward tilt) holding 3–4 pre-arranged bouquets. Each bouquet sits in a Flower Vase Holder, a shallow plastic-lined container filled with water and Floral Foam Block, a hydrated floral foam block (oasis) that the flower stems are inserted into. The foam continuously absorbs and releases water, keeping stems hydrated.

The Refrigeration System system is a sealed hermetic loop. A 1.5 kW rotary compressor pressurizes R404A refrigerant. The high-pressure liquid flows through a thermostatic expansion valve, then evaporates in an evaporator coil mounted in the cabinet interior, absorbing heat and cooling the air to 2–4 °C. A circulating fan distributes this cold air evenly across all six compartments via ducts. The low-pressure vapor returns to the compressor. A thermostat (setpoint 3 °C) de-energizes the compressor when the interior falls below 2 °C; the compressor re-starts when temperature rises above 5 °C. Door seals (silicone gaskets) and 100 mm polyurethane foam insulation minimize cooling load despite frequent door openings.

The Humidity Control maintains the critical 85–95% RH needed to prevent wilting. An ultrasonic Ultrasonic Humidifier, powered by 24 V DC, vibrates a piezo element at 108 kHz to atomize water from a small reservoir, producing a fine mist. Four Misting Nozzle Jets (brass jet tips with 0.5 mm orifices), positioned at the top of the cabinet, spray the mist downward into the compartments. A Humidity Probe, a capacitive probe with ±2% RH accuracy, continuously monitors humidity. When RH falls below 85%, the Master Control Board activate the humidifier for 10–15 second bursts every 30 minutes, maintaining the target range. A small Water Circulation Pump, a 5 mL/min peristaltic pump, circulates water from a reservoir through the misting nozzles, ensuring even distribution.

When a customer navigates the flower-vending-machine-display (a 7 inch IPS LCD showing high-resolution bouquet images) and selects a bouquet, the Master Control Board determine which compartment and shelf position hold that bouquet. The system verifies payment via the integrated EMV Card Terminal and Contactless NFC Reader. Once payment is confirmed, the corresponding door's Solenoid Door Latch solenoid is energized, releasing the magnetic latch and unlocking that specific glass door.

The Automated Bouquet Retrieval arm, a lightweight articulated aluminum linkage with two or three joints driven by DC servo motors, swings into the unlocked compartment. The arm's Bouquet Gripper Basket, a shallow foam-lined basket, positions itself beneath the selected bouquet. The arm then gently lifts the bouquet from its water bucket holder, careful not to crush flowers or break stems. Once secured in the gripper basket, the arm retracts back to the front of the machine, positioning the bouquet above the Presentation Platform.

The presentation tray, a motorized sliding platform with a low protective lip, is positioned inside the machine at this point. The arm lowers the bouquet onto the tray. The Tray Drive Motor, a DC servo with limit switches, then drives the tray forward via a smooth linear bearing system. The tray slides outward, extending the bouquet through the dispensing window to a position where the customer can grip the bouquet handle and remove it from the machine.

Optionally, immediately before or after the tray extends, the Protective Wrapping Roller activates. This is a motorized roller holding a roll of clear cellophane or decorative paper. The dispenser unrolls and wraps the bouquet, then cuts the paper (via a heated wire or blade), leaving the customer-facing bouquet neatly wrapped. Some machines skip this step if wrapping was not requested (or to reduce waste).

Once the customer removes the bouquet (detected by a weight sensor or beam sensor under the tray), the Master Control Board signal the tray motor to reverse and retract the tray back into the machine. The Master Control Board also re-lock the compartment door solenoid, securing that section. The arm is already back in its home position. The system logs the transaction and is ready for the next customer. If no bouquet is removed within 60 seconds, the machine automatically retracts the tray and unlocks the door (safety feature preventing customer confusion).

A critical detail is the water management in the storage buckets. Each bucket holds 200–300 mL of water with an absorbed floral foam block. Over a week, even in high humidity, bouquets lose some water via transpiration. Daily or twice-daily, a maintenance technician (or an optional automated water top-up module, if the machine is sophisticated) refills the water buckets. If this is neglected, flowers wilt rapidly. Some advanced machines include a reservoir and automated water recycling system, but most rely on manual refilling.

Power is supplied by a 1.5 kW industrial switched-mode power supply converting 240 V AC to 24 V DC (for controls, solenoids, and sensors) and 12 V DC (for motors). The compressor and cooling fan are the largest consumers, drawing 600–800 W during active cooling. Standby power (humidifier, controls, display) is 100–150 W. A Master Control Board PLC coordinates all activities: compressor cycling, humidity sensing and misting, payment processing, motor sequencing, and door locking.

Regular maintenance includes daily checking of water levels in the storage buckets, twice-weekly drain and refill of the misting system reservoir (to prevent algae growth), weekly inspection of door gaskets for degradation, and monthly defrosting if frost buildup occurs on the evaporator (though modern controls typically prevent this with periodic defrost cycles).