Mail Tipper Description
This Mail Tipper is designed to lift and tip a Mail York Container full of mail onto a conveyor belt in a controlled manner and has a Safe Working Load of 200 Kgs.. The York Container will be wheeled onto a pair of lifting forks. The Mail Tipper is constructed from Grade 304 stainless steel, is a fully TIG welded construction throughout and is designed to be mobile on castors. This Mail Tipper is powered via a Helical Bevel gearbox that tips the York Container to an angle of 180 degrees.
The York Container was wheeled into lift frame and raised by rotation of the lifting carriage via the motor gearbox. As the York Container was tipped over, parcels were discharged in a controlled manner to a full tip angle of 180 degrees. The York Container was securely retained in the lift carriage in the fully tipped position.
Safety Guard to PD 5304 Safety of Machinery
The safety guard is constructed from 40 x 40 x 3mm stainless steel box section and 3mm wire, 40mm aperture stainless steel weld mesh to meet the requirements of PD 5304 Safety of Machinery. It would enclose the Mail Tipper to a height of 2200mm on two sides, 1000mm at the front with a hinged door on the fourth side. The guard door is electrically and mechanically interlocked preventing the Mail Tipper from operating with the door open. In addition, the guard door can only be opened when the lifting carriage is at the full down position. The area around the conveyor where the Mail Tipper was operating was also guarded. This section of guarding included an interlocked gate that will allow the operator access to the tipping area to clear any blockages or debris.
Guarded Machine Electrical Control
The electrical specification for this Mail Tipper was developed and approved in conjunction with Mail Engineering. The Mail Tipper is fitted with an IP65 Control Panel which is mounted on the safety guard. The control panel incorporated the following controls; Up, Down, Guard Release, Emergency Stop and a Reset Facility. The machine operation was as follows:-
- The Mail Tipper was positioned using a docking bracket and was mechanically and electrically interlocked to ensure that it was in the right place
- The York Container was loaded into the Mail Tipper and the Guard Door closed
- The York Container was detected by a proximity sensor
- The System Start button caused the Mail Tipper to lift to an intermediate limit switch position prior to any mail being emptied out of the container
- The tipper remained at the intermediate limit switch position until a Call to Run signal was received
- Once the Call to Run signal was received, the mail was tipped onto the conveyor
- Once the tipper reached the full tip position and the mail was discharged, the York Container lowered automatically to the full down position