Automatic Motor Operated Jack Project report | screw jack Project Report

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ABSTRACT

A screw jack is a portable device consisting of a screw mechanism used to raise or lower the load. The principle on which the screw jack works is similar to that of an inclined plane. There are mainly two types of jacks-hydraulic and mechanical.
 
Need for Automation OF Automatic Motor Operated Jack OR MOTORISED Screw Jack:
 
Automation can be achieved through computers, hydraulics, pneumatics, robotics, etc. Automation plays an important role in mass production.
For mass production of the product, the machining operations decide the sequence of machining. The machines designed for producing a particular product are called transfer machines. The components must be moved automatically from the bins to various machines sequentially and the final component can be placed separately for packaging. Materials can also be repeatedly transferred from the moving conveyors to the workplace and vice versa.
Nowadays, almost all the manufacturing processes are being atomized in order to deliver the products at a faster rate. The manufacturing operation is being atomized for the following reasons:
  1. To achieve mass production 
  2. To reduce man power
  3. To increase the efficiency of the plant
  4. To reduce the work load
  5. To reduce the production cost
  6. To reduce the production time
  7. To reduce the material handling
  8. To reduce the fatigue of workers
  9. To achieve good product quality
  10. Less Maintenance
.

INTRODUCTION OF Automatic Motor Operated Jack OR MOTORISED Screw Jack:

The motorized screw jack has been developed to cater to the needs of small and medium automobile garages, which are normally man powered with minimum skilled labor. In most of the garages, the vehicles are lifted by using screw jack. This needs high manpower and skilled labor.
In order to avoid all such disadvantages, the motorized jack has been designed in such a way that it can be used to lift the vehicle very smoothly without any impact force. The operation is made simple so that even unskilled labor can use it with ease.
The d.c motor is coupled with the screw jack by a gear arrangement. The screw jack shaft’s rotation depends upon the rotation of D.C motor. This is a simple type of automation project.
This is an era of automation where it is broadly defined as replacement of manual effort by mechanical power in all degrees of automation. The operation remains to be an essential part of the system although with changing demands on physical input, the degree of mechanization is increased.
 
Degrees of automation are of two types:
 
  1. Full automation.
  2. Semi-automation.
In semi-automation a combination of manual effort and mechanical power is required whereas in full automation human participation is very negligible.

Working Principle of Automatic Motor Operated Jack OR MOTORISED Screw Jack:

The jack can be raised and lowered with a metal bar that is inserted into the jack. The operator turns the bar with his hands in a clockwise direction. This turns the screw inside the jack and makes it go up. The screw lifts the small metal cylinder and platform that are above it. As the jack goes up, whatever is placed above it will rise as well, once the jack makes contact. The bar is turned until the jack is raised to the level needed. To lower the jack the bar is turned in the opposite direction. An automatic screw jack has gears inside the jack that are connected to the screw. These gears are connected by other gears and bars that are turned by a power source to raise and lower the jack.
Automatic jack mainly consists of a screw, a nut, thrust bearings, and a body. A stationary platform is attached to the top of the screw. This platform acts as a support for the load and also assists it in lifting or lowering of the load. These jacks are sturdier than the scissor jacks and can lift heavier loads.

Applications OF Automatic Motor Operated Jack OR MOTORISED Screw Jack:

  1. It is useful in auto-garages.
  2. This motorized screw jack is used for lifting the vehicles. Thus it can be useful for the following types of vehicles in the future;
   Maruti, Ambassador, Fiat, Mahindra

Advantages OF Automatic Motor Operated Jack OR MOTORISED Screw Jack:

Automatic motor operated jack offer’s the following advantages:
  • Automatic motor operated jack has a large load carrying capacity.
  • The overall dimensions of the Automatic motor operated jack are small, resulting in a compact construction.
  • Automatic motor operated jack is simple to design
  • The manufacturing of Automatic motor operated jack is easy without requiring specialized machinery Square threads are turned on lathe. Trapezoidal threads are manufactured on a thread milling machine.
  • Automatic motor operated jack provides large mechanical advantage. A load of 15 kN can be raised by applying an effort as small as 400N. Therefore, most of the Automatic motor operated jack used in various applications like screw-jacks, clamps, valves and vices are usually manually operated.
  • Automatic motor operated jack provide precisely controlled and highly accurate linear motion required in machine tool applications.
  • Automatic motor operated jack give smooth and noiseless service without any maintenance.
  • There are only a few parts in the power screw. This reduces cost and increases reliability.
  • Automatic motor operated jack can be designed with the self-locking property. In screw-jack application, self locking characteristic is required to prevent the load from descending on its own.

DISADVANTAGES.

The disadvantages of Automatic motor operated jack are as follows:
(i)     Automatic motor operated jack have very poor efficiency; as low as 40%. Therefore, it is not used in continuous
power transmission in machine tools, with the exception of the lead screw. Automatic motor operated jack are mainly used for intermittent motion that is occasionally required for lifting the load or actuating
the mechanism.
(ii)    High friction in threads causes rapid wear of the screw or the nut. In case of square threads, the nut is usually made of soft material and replaced when worn out. In trapezoidal threads, a split- type of nut is used to compensate for the wear. Therefore, wear is a serious problem in power screws.
 

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