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IRJET- Design and Development of Library Management Robot: Part 1 Development of Travelling Robot with Omni Directional Wheel
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IRJET- Design and Development of Library Management Robot: Part 1 Development of Travelling Robot with Omni Directional Wheel
1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1035 Design and Development of Library Management Robot: Part 1 Development of Travelling Robot with Omni Directional Wheel Pranav Bairagi1, Rushikesh Ghate2, Swarant Patil3 1,2,3Mechanical Engineer, Pune Maharashtra India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - The said paper is the preliminary part of the library management robot. This part consist of a mobile robot which is used to pick the book from the user and send it to the shelve robot. The robot is equipped with Omni direction wheel coupled with planetary geared dc motor. The robot is fully autonomous and the path tracking is carried out using thelinesensingarrayandthe book is scanned using the barcode reader. A pneumatic gripper along with lead screw mechanism is used to liftthebooksfromthe user. The portable air reservoir is used to operate the pneumatic gripper. The lead screw mechanism is operated using the planetary geared motor with encoder. The transreceiver is used to communicate with the shelve robot which shares the barcode information with each other. The main application of the robot is of pick and place mechanism. Key Words: Lead screw, Line Sensing Array, barcode reader, pick and place robot 1. INTRODUCTION In library, the management of books is very complication and timing costing. The location of books could be altered by librarian, students, teachers and any one around the library. Therefore, allocating a book is not an easy task in big library [1]. Recent years have seen an increased awareness of the need for lifelong learning, and major growth in knowledge based industries. Along with this, the general public has come to make greater use of existing general libraryfacilities,andtoexpecta higher level of Service from them. Consequently,librariansandotherskilledlibraryworkersarenowexpectedto providemany highly specialized Services that require detailed knowledge of publications and library Science. In the majority of thelibraries in existence today, however, a large part of the normal workday of Such skilled library staffmembersistakenup withhandling library books: i.e., finding a book desired by a library patron, taking it off the shelf, and placing it in the hands of the user who requested it; and taking books that have been returned by users, carrying them to the bookracks, and returning them to their proper locations on the shelves [2]. 2. FLOWCHART: Figure 1: Electronics Flowchart Robot Side
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1036 At first the user gives the book to the mobile robot by keeping the book in the reception book stand. Therobot byusingtheline sensing array travels towards the stand. As soon as the robot comes towards the stand with the help of proximity sensor it detects the book by moving the gripper in front of the each section of the book stand. Whenever the book is been detected, the pneumatic gripper is been activated and book is been grabbed. The robot is then moved towards the shelve robot by usingthe line sensing array. During the travelling the robot is uses the barcode reader which consist of the shelve number, column number and the row number of the book. With these information robot moves towardstherespectiveshelves.Therobot when comes near by the shelve robot, the shelve gripper is been detected by the proximity sensor and the book is hand it over tothe shelve robot. To operate the vertical lead screw mechanism the robot uses the pwm signals which is then send to the motor driver, this motor driver is used to control the precise motion of the lead screw. The pneumatic gripper is operated using the directional control valve and relay board. Each of the wheel is equipped with the separate planetary geared motor. After each transfer or each sensor detection the led is been blinked for the user purpose to know that the action is been performed. 3. DESIGN CRIETRIA: a. The robot should be mobile and should be travel in every location. b. The weight of the robot should be less. c. The robot arm should be travel in every direction with certain degrees of freedom. d. Robot should detect the book stand, book shelve and the book’s barcode. e. Robot should be rigid enough. 4. DESIGN OF CHASSIS: Type Double Square lead screw support mechanism Material Used Aluminium Square Channel With 20 X 20 mm With 2 mm Thickness Material Used Commercial Grade Chassis Fabrication Methods and Operation Welding, Drilling, Bolting, Grinding and Cutting. Base Chassis Length X Width 450 X 450 mm Chassis Height 500 mm a. There are three layers of the chassis, one is in parallel to second plains with a offset of 100 mm and third plain is perpendicular to the first two plains. Thus the manufacturing of the chassis is divided in to four stages. b. At first the lower chassis is made using the square aluminium sections. The bars are cut into respective lengths and are ready to join. Before joining the channels the fixture is made and the channels are clamp together in order to avoid the angle error while joining and also the bending of the chassis parts. c. At the same time the second layer of the chassis is made with same method and bothare lefttocool down.Toeliminatethe stress the chassis is stress removal processes are carried out. d. Third layer which is perpendicular to the first two layer is allowed to manufacture but with different fixture and of different lengths. After manufacturing all the three different section are brought together. e. The upper and lower section of square chassis is separated using the spacing square rods which is of 100 mm. This gap between the two sections is used to protect the circuit and battery while performing the operations. f. The above L section of the chassis is connected at the 900 to the base chassis. g. After this the fine edges were filleted and the bur was removed. Along with this, the surface of the aluminium was also grinded and polished which were damaged by welding. h. Figure 2, Shows the 3D cad model of the robot chassis.
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1037 Figure 2: Isometric View of Chassis 5. DESIGN OF BASE MOTOR ASSEMBLY: Wheel Type Omni Wheels Wheel Diameter 125 mm Number Of Wheels 4 Shaft Type N8 Wheel Coupling Anti-Slip Type Of Flange Coupling Motor Coupling Anti-Slip Type of Flexible Coupling Outer Diameter- 25 mm Inner Diameter – 8 mm Length - 32 mm Motor Type Planetary DC Geared Motor With Rare Shaft Encoder Torque / RPM 29.1 N cm / 400 RPM Bearing 6100 Make- SKF Motor Clamp Shape & Joining Process L Shape & Bolting Bearing Block Material Aluminium Commercial Grade Bearing Block Dimension 30 X 25 X 30 mm Bearing Block Manufacturing Process and operation Counter Boring and Milling a. The base motor assembly was designed to reduce the vertical reaction develops due to weight of the robot, on to the motor’s shaft. b. The wheels were coupled with the flange type of anti-slip coupling. c. The coupling was then coupled from the hub side to the transmission shaft. Which is passing through the bearing house assembly, this bearing house was made with the help of CNC operating. The end of the shaft is connected to flexible coupling. d. The other end of flexible coupling is connected to motor shaft. The motor is mounted on L shaped clamp which was designed with laser cutting and sheet metal bending operation. Later L clamp was hardened to increase hardness. e. There was three reaction force developed during motion and tworeactionforcesduringsteadycondition.Thevertical force was neutralized by the bearing house assembly. The force left was horizontal force along the axis of motor, this force is absorbed by the flexible coupling. The rotational force is created by the motor so no need to neutralize it. f. All these assembly was fixed on the specific plate known as base plate, with the help ofbolting.The platewasthenjoin to the chassis with bolting at the places were the holes were drilled at the chassis stated above.
4.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1038 Figure 3: Detail View of Base Motor Assembly Figure 4: Base Motor Assembly 6. MOTOR SELECTION FOR VERTICAL MOTION ASSEMBLY: Motor Type Planetary DC Geared Motor With Rare Shaft Encoder Torque Loaded Torque Stall Torque: 72.63 N cm 526 N cm RPM Of Base Motor 9000 RPM Power Transmission From Base Motor To front shaft Planetary geared Type Of Transmission Mechanism Power Rating Stall Current Rated Current No Load Current Stall Voltage <11.7 Ampere <1900 mAmpere <280 mAmpere 24 Volt Front shaft RPM 468 RPM Weight Reduction Ratio Encoder PPR Number of motor used 430 g 1: 19.2 96 PPR 2 7. DESIGN OF VERTICAL MOTION ASSEMBLY: Lead Screw Material & Manufacturing Process Stainless Steel, Lathe Machine Operation. Number Of Lead Screw Used 2 Lead Screw Joining Process With Chassis Flexible Coupling Bearing Type & Dimension Single Row Deep Grove Ball Bearing, SKF, Outer Diameter- 32 mm Inner Diameter- 14 mm Number Of Bearing Used 2 Lead Screw Thread Type Pitch Length Diameter Locking Square 10 mm 450 mm 14 mm Self-Gliding
5.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1039 Number Of Start Nut Type & Material Number Of Nut As Arm 2 Aluminium 2 Motor Coupling With Lead Screw Aluminium Flexible Coupling Nut Type Nut Material Plate Dimension Manufacturing Process Single Plate with internal thread at two section Stainless Steel 100 X 180 mm Milling, Threading Assembly Method Bolting, welding a. The vertical motion assembly uses two lead screw to move the gripper block upanddown.OneLeadscrewisattached at the left side of the chassis using the bolting joint, whereas second at the right side using the same joint. The lead screw is attached to the chassis using the flexible coupling at the top and bottom position. b. The flexible coupling is coupled with the motor shaft rigidly. The motor is fixed at the top position of the chassis lead screw support structure. c. The flexible is used to avoid the misalignment and fluctuating forces between the motor shaft and the lead screw. d. In this way the both the lead screw is fixed at the respective position as shown in the figure 5. e. The nut is made with the help of stainless steel block with the millingoperationinCshape.Theupperandlowerflange of C shape is used to drill holes followed by threading operation. f. This nut is then passes through the lead screw to perform the lifting operation as follows. g. When the left motor rotates in clockwise direction and the right motor with the same speed rotates in the anti- clockwise direction, the lifting force is developed and the gripper block is moved upwards. h. When the right motor rotates in clockwise direction and the left motor with the same speed rotates in the anti- clockwise direction, the downward force is developed and the gripper block is moved downwarddirection.Whenthe block reaches the top position near the motor 1 & 2 then the top limit switch is pressed then the motor is stopped. Whereas when the block is reached near the bottom position near the chassis the bottom limit switch is pressed and the motor is stopped. This limit switch worked as feedback signal to stop the motor in both the condition. i. For vertical lift there are two vertical lead screw mounted where the block weight is divided along the twoleadscrew and the torque required by the single motor is also reduced. j. The Lead screw is having self-locking property since the type of the thread is square. Figure 5: Vertical Motion Assembly
6.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1040 8. DESIGN OF PNEUMATIC GRIPPER Pneumatic Piston Round cylinders DSNU make festo Mode of operation Double-acting Piston diameter 16mm Theoretical force at 6 bar, advancing 23 to 295 N Stroke 200 mm Direction control valve 2/3 solenoid operated direction control valve Number of piston 1 Number of DCV 1 Back Plate Stationary Arm Sliding arm 1 1 1 Manufacturing Process Milling, drilling, threading, finishing Assembly method bolting a. The gripper is manufactured using the four parts. First back plate of support plate which is acts as Nut for the lead screw. Second as stationary arms where these part is used to support the rest of the two parts. Third oneisthesliding arm and fourth is the actuator. b. The base of the mechanical gripper is made up of stainless steel rectangular section. The holes are drilled at the ends, as well as at the mid-section to clamp the stationary arm. c. The stationary arm is the second part mounted between the sliding arm and the base support plate. d. The stationary arm is manufactured into C section with the V slot made in between the two flanges of the C section. This slot is used to slide the sliding arm and to avoid the misalignment while sliding along the stationary arm. e. The third section is sliding arm it is simple is structure with at the end with a V slot and with center drilled holes to clamp the actuator. The sliding arm is mounted in between the actuator and the stationary arm. f. The actuator here used is pneumatic piston. The actuator is mounted at one of the flange of the stationary arm using the bolting. g. Together all this four structural elements forms the pneumatic gripper. Figure 6: Detail Isometric View of Pneumatic Gripper
7.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1041 Figure 7: Pneumatic Gripper Assembly Top View h. At the center of the stationary arm and the base plate there is a rectangular slot ploted in order to clamp the barcode reader. When the gripper clamps any book the reader reads the barcode pasted on the book. Which then uses as a feedback signals to know which book is been picked. i. When the piston moves in forward direction, then the sliding arms comes closer to the other flange of the sationary arm, whereas, we can also say that the sliding arm moves away from the flange where the actuator is mounted onthe stationary arm. This movement creates the compresive force on the book by which the book is been kept at stationay position while lifting and travelling. j. When the sliding arm touches the limit of end-section then the limit switch is pressed and the robot comes to know that the book is grabbed. Same as when the arms touches the end section near the actuator holder the limit switch is pressed and the robot came to know the position of the arm. k. To exert a specific amount of pressure there is pressure sensor(notshowninabovediagram)isplacedatthereservoir to detect the amount of pressure of the air by which piston exerted on the object to be grabbed. When the specific setted limit is reached the pressure control valve is used to bypass the pressure to atmosphere. This action is carried out to avoid any damage to the object. l. As soon as the pressure limit is reached or the limit switches are pressed, the controller sends the led indication for user to understand the condition. Figure 8: Pneumatic Gripper Circuit Figure 9: Complete Travelling Robot with Omni Directional Wheel
8.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1042 9. DISCUSSION a. The Planetary geared motor is used as an actuator to carry out the vertical motion to lift the gripper. b. Omni wheels are used to displace the robot in all the angles as considering the robot facing one direction placed at origin without any change in direction as follows: 45(diagonally), 90(Forward), 135(sideways), 180(backwards), 225(diagonally), 270(backwards), 315(diagonally), 360(sideways) degree angles. c. The robot can take 360 degree rotation without changing the axis. d. Robot is driven in autonomous mode using the line sensing array. e. With the help of pneumatic gripper we could lift any kind of book. f. For fast operation of lead screw mechanism we used double start lead screw. g. Capacitive proximity sensor is used for detection of books and other objects alongwithlimitswitchesfordetermining the limits of each mechanism. REFERENCES [1] Wing W. Y. Ng ; Yi-Song Qiao ; Li Lin ; Hai-Lan Ding ; Patrick P. K. Chan ; Daniel S. Yeung, “Intelligent book positioning for library using RFID and book spine matching”, 2011 International Conference on Machine Learning and Cybernetics, 12 September 2011 [2] Yoshiyuki Nakano, Kanazawa (JP), Yusuke Kihara, Tokyo (JP),KatsukiSakimoto,Yuuki(JP),YoshikiHayashi,Gifu-ken (JP), ‘AUTOMATED LIBRARY SYSTEM WITH RETREVING AND RESPOSITINGROBOT’,PatentNumberUS6,535,790B2, Mar.18, 2003 (10) P. [3] I. Ehrenberg, C. Floerkemeier, S. Sarma, "Inventory management with an RFID-equipped mobile robot", Proc. of the IEEE Int. Conf. on Automation Science and Engineering (CASE), 2007. [4] S. Schneegans, P. Vorst, A. Zell, "Using RFID snapshots for mobile robot self-localization", Proc. of the European Conf. on Mobile Robots (ECMR), 2007. [5] J. Thirumurugan, M. Vinoth, G. Kartheeswaran, M. Vishwanathan, “Line following robot for libraryinventorymanagement system”, INTERACT-2010 [6] Loh Poh Chuan, Ayob Johari, Mohd Helmy Abd Wahab, Danial Md. Nor, Nik Shahidah Afifi Md. Taujuddin, MohdErdiAyob, “An RFID warehouse robot”, 2007 International Conference on Intelligent and Advanced Systems, 24 October 2008 [7] Longfei Shangguan and Kyle Jamieson, PrincetonUniversity,UniversityCollegeLondon{longfeis,kylej}@cs.princeton.edu, “The Design and Implementation of a Mobile RFID Tag Sorting Robot”
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