Architectural requirements for an AGV system in hospitals. Basic information supplied by MLR System

Transcription

1 Architectural requirements for an AGV system in hospitals Basic information supplied by MLR System Version 1.00 dated

2 MLR System GmbH Architectural requirements for an AGV system in hospitals page 2 of 8 1. Introduction The following document is intended as a first guideline regarding the architectural requirements when using AGVs for the horizontal (and vertical) transport of containers. It contains only general preliminary information. For a specific project the information given in this document have to be adapted as well as additional information are needed. 2. Short cuts AGV = automated guided vehicles ACC = AGV control center FD = Fire door LAN = Local Area Network WLAN= Wireless Local Area Network 3. Index 1. Introduction Short cuts Index Planning / design of transport ways Operation Conditions... 4 Ground / Floor tolerances:... 4 Other Requirements Elevator... 6 Design Principles... 6 Mechanics... 6 Electronics... 7 Human Safety Fire doors in the drive way of the AGV Doors in the drive way of the AGV Networks / Cabling Stop positions in case of fire Automatic Container washer... 8

3 MLR System GmbH Architectural requirements for an AGV system in hospitals page 3 of 8 4. Planning / design of transport ways The transport ways should be designed to allow the containers to be transported vertically as well as horizontally in time from the functional areas like kitchen laundry etc to the wards and back. Into consideration should be taken the overall numbers of containers per day and their distribution over time (time table). In addition for special goods like food restrictions in the delivery time from the functional areas to the ward apply leading to peak transport numbers. For the vertical transport lifts are used. Depending on the concept either the AGVs enter the lifts or the lifts are equipped with a handling unit taking over the containers from the AGV. The achievable throughput of containers is determined by number of lifts to be used for container transport speed of lifts to be used for container transport whether the lifts are used exclusively for AGV or in addition used for bed transports as well as persons. Does the AGV or others like doctors, nurses etc have the priority in using the lifts. The horizontal transport takes places by using AGVs. The achievable throughput of containers is influenced by possibility to keep driveways used by the AGV mainly free of persons and other transports Design of driveway favoring or hindering the AGVs. For example: o is there enough space for two or even three AGVs passing each other o are there waiting positions near the lifts, to avoid that an AGV waiting for a lift is blocking the whole traffic o are the doors in the driveway wide enough to let the AGV pass without the need to slow down o is the pathway mainly straight without too many bends allowing a higher average speed of the AGVs o Are there many crossings hindering the AGVs number of available handover stations per ward number of available handover stations and size of buffers in the functional areas like kitchen, laundry etc or size of separate buffer number of available handover stations including size of buffers near the loading / unloading docks for external containers numbers of doors opening into the driveway of the AGV In addition it should be taking into account: sufficient space for AGV charging stations (one per AGV) sufficient space for maintenance area

4 MLR System GmbH Architectural requirements for an AGV system in hospitals page 4 of 8 5. Operation Conditions The following preconditions are required for the operation of an AGV system: Ground / Floor tolerances: Tolerances for the evenness of the surface of tube ceilings, stone floors and grounds according to DIN 18202, page 3, table 3, line 3: The clearance of the vehicles (approx. 40 mm) has to be considered at the transitions to ascents. Ground: Sub concrete: Compression strength Ground load B25 without cracks Wear and tear coating: cement stone floor, cement stone floor with additional synthetic resin or bitumen magnesite stone floor, synthetic resin coating static 6-8 N/mm² dynamic N/ mm² approx dan/m² Frictional coefficient with Vulkollan: min. 0,6 Electrical shunting resistor: max Ohm in order to avoid static chargings Expansion gap: Width max. 10 mm, design with edge protection, vertical movements are to be avoided. Max. permissible height difference 4 mm.

5 MLR System GmbH Architectural requirements for an AGV system in hospitals page 5 of 8 Other Requirements Minimum carriageway width in connection with passenger traffic With oncoming traffic Temperature range: Vehicle width 50 cm on each side 2 x vehicle width plus 1,4 m +10 C up to +40 C Humidity: < 70 % For reasons of safety the carriageway always has to have sufficient grip for eventually necessary emergency brakes.

6 MLR System GmbH Architectural requirements for an AGV system in hospitals page 6 of 8 6. Elevator The following text describes the basic design principles for the mechanical layout of the elevator and the design of the electrical and logical interface. Design Principles Mechanics For the layout of an elevator, the building regulations of the federal states, the trade regulation, the elevator regulation, elevator bye-law, DIN standards and technical rules have to be observed. In addition to the requirements of the general use of an elevator the following criteria for use by the AGV S have to be realized: Dimensions of freight elevators: Cabin inside: clearance length LA = largest length AGV with load L + Z3 + Z4 Clearance width BA = largest width AGV with load B + Z1 + Z2 Clearance door width TA = largest width AGV with load B + Z5 + Z6 Z1 and Z2 = marginal allowances; Z1 500 mm; Z2 500 mm Z3 and Z4 = length allowances; Z3 500 mm; Z4 500 mm Z5 and Z6 = marginal allowances doors; Z5 200 mm; Z6 200 mm With a special permit by the responsible government safety organization, the dimensions Z1, Z2, Z3 and Z4 can be reduced to 200 mm. Clearance height HA = largest height driving AGV with elevated load mm Typical AGV dimensions with container: Length = 1750, width = 1000 mm, height = 1900 mm (may vary depending on design of AGV and container) Transport weight: Weight of load + weight of AGV Floor conditions: Pressure resistance: static 6 8 N/mm2 / dynamic N/mm2 Coefficient of friction with Vulkolan: min. 0,6

7 MLR System GmbH Architectural requirements for an AGV system in hospitals page 7 of 8 In order to enable loaded vehicles to drive in and out, following tolerances for driving into cabin have absolutely to be observed: Difference in height : Between cabin and solid ground max. +/- 4 mm, independent of the loading condition of the vehicle. This maximal difference in height must also be maintained, if the vehicle is only half the way driven into the cabin. For this purpose the cabin can be mechanically clamped on a fix level in the floor or deposited or the control unit readjusts the height level depending on the load weight. The reaction time of the level regulation may account for max. 1 sec. Sagging of the AGV for more than 10 mm might lead to touch down with floor contact. Gap: Between cabin floor and level floor the gap dimension may only account for max. 20 mm. Electronics The terminal block in the switching cabinet of the AGV S is the interface for providing the output signal of the AGV and for the input signals being provided by the elevator control. For each elevator a bus knot is being provided. All connections up to the switching console AGV S are supplied by the employer. - Terminal block: The terminal block bus knot is clearly labeled. - Potential: The required signals have to be put on the corresponding clamps floating distance. - Bus knots: The connection is made by an Interbus system. For each elevator control cabinet a separate bus knot has to be installed with the necessary input and output modules. In order to minimize the efforts for installation, the switching console AGV S shall be installed close to each elevator control cabinet. - Signals: All signals are static. They have to be set or reset Human Safety Distances: The required safety distances have to be met. Messages: For human safety reasons, the supplier of the elevators has to install an optical message showing that the elevator was reserved by the AGVS respectively is presently being used by the AGV S (e. g. Attention - Automatic Transport Operation ). This message must appear inside the cabin as well as outside the cabin.

8 MLR System GmbH Architectural requirements for an AGV system in hospitals page 8 of 8 7. Fire doors in the drive way of the AGV It is necessary that fire doors especially the electrical control are adapted to AGVs and have an interface to the AGV Control Center (ACC). In case of fire it must be avoided that a fire doors tries to close while an AGV is located in the area of the fire door (door hitting the AGV). To prevent an overlap of fire, the fire door must nether less close after a defined time regardless of the situation of the fire door. 8. Doors in the drive way of the AGV The doors in the driving way of an AGV must have an interface to the AGV Control Center (ACC) to allow an automatic opening and closing of the doors. In addition it should be taken into consideration that the door width should be sufficient for an AGV to pass with loaded container and not only a person. Were ever possible the width should be sufficient for two AGVs passing each other to avoid single lane traffic through the doors. 9. Networks / Cabling The AGV system needs certain networks like LAN / W-LAN network for the communication between AGV S and AGV control unit (ACC) LAN or Interbus or Profibus/net to communicate between terminals, fire doors, lifts and the ACC For these networks the space for cable chutes, as well as openings in the walls must be foreseen. 10. Stop positions in case of fire Some local fire regulations require having special stop positions for the AGV in the driveway which might require additional space in the corresponding corridors. 11. Automatic Container washer When planning automatic container washer there are many factors to be considered. Some critical are listed below: Available height for container washer and conducts for air / mist Pit in the floor Space for wash lotion containers / barrels