Design of grip for LT-89 tractor

Contents

Entry

1. Brief overview of tracking machines and analysis of existing gripping structures

1.1 Brief characteristic of the LT- tracking tractor

1.2 Domestic structures of grips of forest track tires

1.3 Foreign designs of wood track tires

1.4 Varieties of tick-borne grips

2. Overview and Analysis of Capture Devices by Patent Source

3. Modernization of packet capture based on LT- machine

4. Determination of basic parameters of the working surface of the gripper

5. Create a tick mark profile

6. To Create a Catch Layout and Kinematic Scheme

7. Calculation of basic parameters and selection of hydraulic drive elements

8. Calculation of gripping elements per meter

8.1 Determination of bending moments acting on tick-borne products

8.2 Selection of material and section profile of the glue

8.3 Check of the axis connecting the hydraulic cylinder and the tick tick-tick-tick-tick-tick-tick-tick

8.4 Check of cross-arm axis

8.5 Check of axle connecting cross-arm and tick-piece

8.6 Check of dangerous cross-section of cross-arm

Conclusion

List of sources used

Application

Introduction

The gripping device of forest machines is intended for clamping of people or peaks of fallen trees during trawling and loading them into conic. Fallen trees are collected in a pack for trackling them to the forest horn with the help of a grip and a hydromanipulator. Parameters of tree collection mechanisms are lifting capacity and maximum gripping size.

From the moment of its appearance to the present, a large number of different types of adhesive grips have been created for track tractors with a manipulator: with one vertically located hydraulic cylinder of the drive, with two hydraulic cylinders of the drive, with horizontally located hydraulic cylinders of the drive.

Due to its simplicity, versatility and low cost, tick-borne grabs have become very widespread in logging.

The main drawbacks of the grabs are the small productivity, the difficulty of accurately guiding the grabs to fallen trees, the weak reduction of a pack of trees during trekking.

The purpose of the course project is to develop the design of the tick-borne grip of the LT89 tractor.

The objective of the course project is achieved through the following tasks:

1. A brief review and analysis of existing tick grip designs is required.

2. Calculate the basic parameters and build the profile of the gripper tick stone.

3. Calculate the grip actuator and determine its main design dimensions.

Conclusion

As a result of the development of the course project, special literature, patent documents and other scientific and technical materials were developed. This made it possible to acquire skills in the selection of the necessary information and its effective use in solving specific engineering tasks.

As a result of the design, we received a packet grip with the following parameters:

Weight of whip pack, kN................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 50

Maximum diameter of whip, m......................................... 0.4

Average diameter of whip, m................................................. 0.3

Size of tick stone opening, m........................................ 1.25

Distance between attachment axes, m....................... 0.8

Radius of curvature of the working surface of glues, m.............. 0.353

Operating pressure in the hydraulic system, mPa.................................... 10

Stroke of hydraulic cylinder rod, m............................................. 0.25