BOX SHIFTING MECHANISM. Submitted in partial fulfilment of the requirements for the award of the degree of. Bachelor of Technology. in. While in the normal conveyor mechanism such actions cannot be The box moving or shifting set up has a simple mechanism, operated with crank and links . Keywords: Box Moving Mechanism, Conveyer System, DC Motors, Four Bar . The box shifting mechanism plays a major role in industries, the process of.
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3 ABSTRACT The study of box shifting mechanism to trace a desired path is an important part of obtaining the optimal geometry of a box shifting mechanism. caite.info - Free download as PDF File .pdf), Text File .txt) or view presentation slides online. Box Shifting Mechanism - Download as Word Doc .doc), PDF File .pdf), Text File .txt) or read online. technology,project,mechanical engineering,engineering.
SlideShare Explore Search You. Design and Fabrication of Shaft Drive for two Wheelers. Kinzel, J. Conclusion is, we want to thanks to lecturer and my friend during learning of Box transporting machine. The majority of four-link mechanisms fall into one of the following two classes: Oana Corduneanu.
Views Total views. Actions Shares. Embeds 0 No embeds. No notes for slide. Box transport mechanism 1. April 3. The eight bar mechanism allows moving more than one article as compared to its four bar counterpart. Transport mechanisms generally move material and their application lies in various industries- manufacturing, assembly, packaging etc. In this project we apply the path generation synthesis and coupler curve synthesis and study to fabricate our model which is an eight link transporter mechanism.
The synthesis would Chebyschev theorem for cognate linkages and parallel motion generation where we want the output link of the mechanism to follow a particular path without any rotation of the link as it moves along the path.
The final model will be constructed by modelling in CAD software solid edge that will eliminate the errors that might have crept in graphical synthesis. In actual fabrication process the model will be refined as the final fitments are done by tools and processes like welding, drilling, fitting, grinding.
The model then undergoes trial run and is examined for the prescribed motion characteristics. We would like to thank, Mr. Dharmendra Singh Assistant Professor ME , for giving guidance, stimulating suggestions and moral support. We are grateful to him for sharing his time and expertise. His faith in us has always made more confident. It had been our privilege to work under his guidance. We would also like to thank Mr. We are also thankful to all the faculty members of mechanical engineering department and our colleagues for their cooperation.
We would like to thank our family for their continued support throughout this work. Our parents have always been there for us and provided the best opportunities. No one has been as motivating and inspirational to us as our parents. Thank you for your consistent help and support. Awadhesh Singh Yadav Roll No. Though the continuous movement is more or less important in the same field the sporadic motion has become essential. The objective of our project is to produce a mechanism that delivers this stop and move motion using mechanical linkages.
The advantage of our system over the conveyor system is that the system has a time delay between moving packages and this delay can be used to introduce any alterations in the package or move the package for any other purpose and likewise.
While in conveyor system such actions cannot be performed unless programmed module is used to produce intermittent stopping of the belt which basically is costly. The prototype design requires electric motor, shafts and the frame of which the frame and platform on which the packages are moved is fabricated. All the links are being made of Wood which reduces the weight of the whole system including the head which has a direct contact with the boxes being moved.
The system is expected to move as heavy packages as 2 - 3kgs approximately. The mechanism is for moving articles with intermittent advancement. The eight-bar mechanism allows moving more than one article, as compared to a four bar walking beam. In a workstation, an assembly line in order to obtain the required production rate and to achieve a minimum amount of idle time.
Understand the fabrication techniques in a mechanical workshop. Understand the usage of various mechanical machine tools and also measuring tools. Linkages can be designed to change the direction of a force or make two or more objects move at the same time.
Many different fasteners are used to connect linkages together yet allow them to move freely such as pins, end-threaded bolts with nuts, and loosely fitted rivets. There are two general classes of linkages: The names of the linkage mechanisms given here are widely but not universally accepted in all textbooks and references.
Linkages can be classified according to their primary functions: Reverse-motion linkage: If the fixed pivot is equidistant from the moving pivots, output link movement will equal input link movement, but it will act in the opposite direction. However, if the fixed pivot is not centered, output link movement will not equal input link movement. By selecting the position of the fixed pivot, the linkage can be designed to produce specific mechanical advantages.
Push-pull linkage: Figure 2 Functions of four basic planar linkage mechanisms The moving and fixed pivots on the opposing links in the parallelogram must be equidistant for this linkage to work correctly.
Pantographs that obtain power for electric trains from overhead cables are based on parallel-motion linkage. Drawing pantographs that permit original drawings to be manually copied without tracing or photocopying are also adaptations of this linkage; in its simplest form it can also keep tool trays in a horizontal position when the toolbox covers are opened.
Bell-crank linkage: This linkage rang doorbells before electric clappers were invented.
More recently this mechanism has been adapted for bicycle brakes. By squeezing the two handlebar levers linked to the input ends of each crank, the output ends will move together. Rubber blocks on the output ends of each crank press against the wheel rim, stopping the bicycle. If the pins which form a fixed pivot are at the midpoints of the cranks, link movement will be equal. However, if those distances vary, mechanical advantage can be gained As we mentioned before, a mechanism composed of rigid bodies and lower pairs is called a linkage Hunt In planar mechanisms, there are only two kinds of lower pairs revolute pairs and prismatic pairs.
The simplest closed-loop linkage is the four bar linkage which has four members, three moving links, one fixed link and four pin joints.
A linkage that has at least one fixed link is a mechanism. Figure 3 Crank rocker mechanism Two of the links are pinned to the frame which is not shown in this picture. In Sims Design, links can be nailed to the background thereby making them into the frame.
How many DOF does this mechanism have? If we want it to have just one, we can impose one constraint on the linkage and it will have a definite motion. The four bar linkage is the simplest and the most useful mechanism. A mechanism is composed of rigid bodies and lower pairs called linkages Hunt In planar mechanisms there are only two kinds of lower pairs: Stated more specifically linkages may be used to convert: Continuous rotation into continuous rotation, with a constant or variable angular velocity ratio.
Continuous rotation into oscillation or reciprocation or the reverse , with a constant or variable velocity ratio. Oscillation into oscillation, or reciprocation into reciprocation, with a constant or variable velocity ratio. Linkages have many different functions, which can be classified according on the primary goal of the mechanism: Function generation: A variety of useful mechanisms can be formed from a four-link mechanism through slight variations, such as changing the character of the pairs, proportions of links, etc.
Furthermore, many complex link mechanisms are combinations of two or more such mechanisms. The majority of four-link mechanisms fall into one of the following two classes: The four-bar linkage mechanism, and 2. The slider-crank mechanism. In the range of planar mechanisms, the simplest group of lower pair mechanisms are four bar linkages.
A four bar linkage comprises four bar-shaped links and four turning pairs as shown in figure 4. Figure 4 Four bar linkage A link which is free to rotate through degree with respect to a second link will be said to revolve relative to the second link not necessarily a frame.
If it is possible for all four bars to become simultaneously aligned, such a state is called a change point. Some important concepts in link mechanisms are: A side link which revolves relative to the frame is called a crank.
A side link which does not revolve is called a rocker. The link which connect the crank and rocker are called as coupler. Crank-Rocker mechanism: In a four bar linkage if one of the side link revolve and other side link oscillate then the mechanism known as Crank-Rocker Mechanism where shortest link is the input link crank.
Rocker-Crank Mechanism: Double-Crank mechanism: In a four bar linkage, if both of the side links revolve, it is known as Double-Crank Mechanism where the shortest link is the ground link frame. Double-Rocker mechanism: In a four bar linkage, if both of the side links rock, it is known as Double-Rocker Mechanism where the shortest link is the floating link coupler.
Fig 4-a fig 4-b fig 4-c Crank-Rocker Mechanism: A 4-bar linkage mechanism has a crank that rotates at a constant angular speed. The crank is connected to the coupler which is connected to the rocker. The frame does not move. Fig 5 crank rocker Fig 6 Walking Beam Info: The walking beam in blue pushes articles in pink forward, and the material is left stationary in the return stroke of the walking beam until the next cycle.
The eight-bar mechanism allows moving more than one article, as compared to four bar walking beam.
This Working Model file is adapted from Figure P3. Material Selection 8 5. Part Drawings 9 6. Assembled Drawings 15 7. Rough Estimate of the Cost 17 8.
Shortcomings and Remedies 18 Conclusion 19 Reference 20 3 1. Relevance A conveyor system is a common piece of mechanical handling equipment that moves materials from one location to another.
Conveyors are especially useful in applications involving the transportation of heavy or bulky materials. Conveyor systems allow quick and efficient transportation for a wide variety of materials, which make them very popular in the material handling and packaging industries.
Many kinds of conveying systems are available, and are used according to the various needs of different industries. Also, many have advanced safety features that help prevent accidents. Typical Conveyor Systems used in industries Gravity roller conveyor, gravity skate wheel conveyor, belt conveyor, wire mesh conveyors, plastic belt conveyors, bucket conveyors, flexible conveyors, vertical conveyors, spiral conveyors, vibrating conveyors, pneumatic conveyors, belt driven live roller conveyors, line shaft roller conveyor, chain conveyor, screw conveyor, 4 chain driven live roller conveyor, overhead conveyors, dust proof conveyors, pharmaceutical conveyors, automotive conveyors.
Industries where above conveyers are used Conveyor systems are commonly used in many industries, including the automotive, agricultural, computer, electronic, processing, aerospace, pharmaceutical, chemical, bottling and canning, print finishing and packaging. Although a wide variety of materials can be conveyed, some of the most common include food items such as beans and nuts, bottles and cans, automotive components, scrap metal, pills and powders, wood and furniture and grain and animal feed.
Features Box Shifting Type Conveyor The conveyors used in industries are mostly of continuous motion type that is they transport the items without periodic stop unless there is some special mechanism or steeped motor is used.
This project is basically a periodic motion machine which can shift boxes in step by step manner with some dwell and without the need of any stepped motor. The period of dwell can be set by changing the rotation speed and crank size. Design Aspects Our project work is divided into two parts — 1.
Preparing the carrier mechanism The carrier mechanism contains the base, support structure and gears to run the carrier and the feeder. First of all the shafts are turned on lathe for the two gears running the carrier. Then the crank gears and the gears to run the slotted link are made. On the base four wooden blocks are fixed which act as support. Then three blocks with holes are drilled and bearings are fit to support the shaft.
Cranks are fitted on the shaft by tight fitting by bolts. The shafts for slotted link are fitted on the gears. Preparing the feeder mechanism The feeder mechanism has a link of zigzag shape which is attached to the slotted link. The metal sheet with a slot is fixed to the structure. Guides are welded on the slotted sheet for the carrier and the feeder link. The carrier is attached to the cranks.