CALCULATION OF MAIN PARAMETERS OF ROAD RINK DU-99

Contents

INTRODUCTION

1. PURPOSE AND CLASSIFICATION OF ROAD RINK

1.1.Assignment and Scope

1.2.Classification of road rink

1.3.The main manufacturers

Section Output

2. DEVICE AND PRINCIPLE OF ROAD RINK OPERATION

2.1. Roller hydraulic system

2.2. Vibration roller

2.3. Pneumatic screw shaft

2.4. Motor - gearbox

2.5. Braking systems

Section Output

3. CALCULATION OF MAIN PARAMETERS OF ROAD RINK

3.1.Select geometric parameters

3.2. Traction calculation

3.3. Calculation of rink brakes

3.4. Calculation of rink main parts strength

3.5. Calculation of rink performance

Section Output

4. SAFETY REQUIREMENTS

Section Output

5.TECHNICAL MAINTENANCE OF ROAD RINK

5.1.  Maintenance safety measures  

5.2.  Types and periodicity of maintenance

5.3. General lubrication instructions

5.4 Replacement of operating fluid in the roller hydraulic system

Section Output

CONCLUSION

LIST OF LITERATURE

Introduction

Relevance: The most important element of the roadway construction process is its compaction. Durability and other performance indicators of roads depend on the quality of erection of the roadway. The process of compacting materials is reduced in one way or another to applying a load to the surface of the structural layer of the road, under the influence of which mineral particles approach, their more compact arrangement and pore reduction. In this course work, I took the DU99 road rink as a machine for compacting the roadway and made calculations of its main parameters.

The purpose of this course work is to calculate the strength of the main parts, the vibrator and the pneumatic wheel roller, find the traction force and the power of the roller, after the calculations, consider what forces are spent during operation and find out the performance of the two-roller combined vibration road rink DU-99.

To achieve the goal, the following objectives must be achieved:

1) consider the purpose and classification of the road rink;

2) get acquainted with the device of road rink DC99;

3) calculate the main parameters of the DC99 roller, the strength of the main parts, the vibrator and the pneumatic wheel roller, i.e. calculate what forces are spent on resistance;

4) familiarize yourself with the safety procedures during the rink operation;

5) familiarize yourself with the maintenance of DC99 roller.

The object of the study is a two-roller combined vibration road rink DU-99.

The subject of the study is a vibrator and a pneumatic wheel roller.

This course work can be used in the road construction industry.

The work is presented on 54 sheets, contains 10 figures, 4 tables and 6 literary sources. Attached to the explanatory note is a graphic part consisting of 2 sheets of A1 format.

Purpose and classification of road rink

1.1.Assignment and Scope

Vibration rollers, like static ones, are used in the production of repair and construction road works. The main difference between vibration rollers is the presence of an integrated vibrator in one of the rollers (driving or driven), which achieves a significant increase in the efficiency and quality of coating compaction. With the vibrator turned off, such rollers can work like ordinary static ones.

Vibration rollers with smooth rollers in recent years have been increasingly used in compacting gravel, gravel and asphalt concrete mixtures. Vibration self-propelled rollers in comparison with static rollers have lower metal consumption, are more maneuverable and transportable, when properly organized, they provide the required density and evenness of the surface of sealed materials. Self-propelled vibration rollers for compaction of road surfaces are manufactured mainly by two-roller biaxial rollers. In vibratory two-roll rollers, either or both of the rollers may be vibratory.

With a driving vibrating roller, the conditional coefficients of friction and its adhesion to the surface of movement are sharply reduced, which reduces the traction force along the grip and makes it difficult to move on slopes.

If the vibrator is a driven roller roller, control of the roller becomes difficult. Another significant disadvantage of vibrating rollers is the difficulty of providing reliable and durable operator protection against the harmful effects of vibration. To a large extent, these disadvantages are eliminated in vibrating rollers with two vibrators, which operate in opposite phases and are both driving and controlled. When designing vibration rolls, it is desirable to provide a change in the disturbing force for use in the most advantageous operation modes when compacting various materials.

1.2.Classification of road rink

Soils and road construction materials are compacted by rolling, ramming, vibration and vibration ramming. In all cases, the impact on the material of the working elements of the machine is associated with the application of a cyclic load to it. Compaction of soils and road-building materials shall be carried out only by special machines designed for this purpose.

Compaction of materials by rolling during the construction of road bases and coatings is carried out by self-propelled motor rollers with smooth metal rollers, rollers in the form of pneumatic tires and combined working elements (pneumatic wheel and smooth vibrator ).

According to the number of axes and rollers, skating rinks are distinguished: uniaxial single-shaft with or without supporting rollers or wheels; biaxial two-roll with one or two drive rollers; biaxial three-roll; biaxial three-roll with additional roller of small diameter; triaxial three-roller with one or three driving rollers.

According to the specific linear pressure, the rollers are divided into light ones with a linear pressure of less than 40 kN/m (weight up to 5 tons, power up to 25 kW), medium ones with a linear pressure of 35... 60 kN/m (mass 6... 10 tons, 25... 30 kW), heavy with a linear pressure of 60 kN/m or more (weight 10 t, power more than 35 kW).

According to the principle of action, static rollers are distinguished, sealing the material only under the influence of its own weight, and vibration, sealing the material under the influence of its own weight and periodic fluctuations of one or more working elements (rollers). Self-propelled rollers with smooth rollers are also classified by the type of power plant (with internal combustion engines and a combined power plant), by the type of transmission (mechanical, hydromechanical, hydraulic), by the control system (manual, hydraulic).

The main road motor rinks with smooth rollers, which have become most widespread in compacting road bases and surfaces, are two-roll and three-roll biaxial and three-axle static and vibration rinks.

1.3.The main manufacturers

1. JCB - the company's factories manufacture rollers:

tandem vibration, with improved maneuverability - VMT model range;

trench (VM series), compact, with high cross-country ability;

vibrational with two rollers, vibration insulation linings, with foot operator - VMD series;

ground vibratory;

one roller sealing.

2. Hamm is a company that has been developing a line of road rinks since 1911. Today, the nomenclature range includes rinks:

tandem - HD series;

series DV - with vibration of both rollers;

static type, with two or three rollers;

pneumatic;

hinge joint;

combined with two rolls of different types;

compact class (with a weight of up to 3 tons), with rear oscillating rollers.

3. Volvo is a Swedish company with production facilities in Germany, India, USA, China produces rinks:

powerful two roller, road models;

ground vibratory;

vibration rollers with reinforced rollers made of high-carbon steels, with a system for distributing traction force TwinLock.

4. Bomag - a German company produces soil, asphalt rinks of the BW and ADO series:

manual with smooth rollers, with one or two rollers;

vibration (light and heavy classes);

heavy articulated;

pneumatic wheelbarrow;

with the TanGO system (tangential oscillation of the rear roll).

All brand-produced asphalt models of ice rinks are equipped with an automatic, adjustable system for controlling the degree of rolling compaction (ASPHALT MANAGER).

Russian-made rinks

1. Rastat - the leading manufacturer produces several lines of asphalt rinks:

6 standard sizes compact, smoothly roller, with a weight of 1.53.5 tons, 5 models of class 711 tons;

with smooth rollers, static action - DU981, DU-93;

pneumowheel - the unified modular design of DU65 (12 t.) - capable to work with the shift of rollers rather each other, rolling surfaces of bigger width, DU100, DU-101;

powerful, vibration type - DU105, DU-106, DU107;

vibration rollers with smooth rollers - DU96, DU-98, DU47B;

the combined vibration - DU99;

vibration with one roller for soil - DU74, DU-85;

vibration trailers - DU70, DU-94;

2. Dormash - a production and commercial enterprise produces various components and spare parts for sealing machines, produces the following types of rollers:

smooth vibration - DM02;

smooth with two, three rollers;

pneumatic wheelbarrow;

sidewalk, small;

manual paving - DM006 (weighing 0.6 tons, with seal width - 60 cm.);

combined.

3. Irmash - the company specializes in the production of light rinks:

paving vibrations with hydraulic, mechanical drive;

pneumo-wheeled, with smooth rollers;

vibrational with one roller.

Section 1 output

Rink DU99 is designed for compaction of asphalt concrete and bitumineral mixtures coatings with large volumes of work on public roads. Road rink DU99 is classified as vibratory, combined, biaxial, heavy with a weight of 10.5 tons. The rink belongs to the manufacturer of RASKAT road rinks, which has been engaged in the production of rinks since 1931, since then more than 135 thousand units of sealing equipment for various purposes have been manufactured at the enterprise.

Conclusion

During the course work, conclusions were drawn for each section:

Rink DU99 is designed for compaction of asphalt concrete and bitumineral mixtures coatings with large volumes of work on public roads. Road rink DU99 is classified as vibratory, combined, biaxial, heavy with a weight of 10.5 tons. The rink belongs to the manufacturer of RASKAT road rinks, which has been engaged in the production of rinks since 1931, since then more than 135 thousand units of sealing equipment for various purposes have been manufactured at the enterprise.

The DC99 vibration combined roller has a design that provides high maneuverability with the passage of trace-to-trace rollers. Road roller DC99 has one vibration roller on the front axle and a pneumatic wheel roller on the rear axle, the drive is carried out on both rollers. The model has two vibration modes, which extends the list of efficiently compacted materials, allowing the model to be used to compress bases from various road building materials and road surfaces from bituminous mineral mixtures.

During traction calculation, the required engine power was calculated at operating mode, equal to Ndv = 69 kW, which is enough for the MMZ power unit D24592/72 kW/2200 rpm, which is installed on this roller. The brake force of the roller is PT = 30.1 kN.

After calculating the strength of the rollers, the following results were obtained: the moment of friction forces that prevents rotation of the roller is equal to Mtp = 3 kNm, the moment of resistance to rotation of the wheel of the pneumatic wheel roller is equal to MP1 = 1.2 kNm. For a roller with a pneumatic tire, the inertia force is Pu = 29.7 kN, the reaction on the wheels when hitting the obstacle is Rx = 22.79 kN.

The performance of the roller is 656.25 m2/h with a rolled strip width of 1.7 m; the size of the slabs of the trace of the previous passage is 0.2 m; average speed of the rink 3.5 km/h; number of skating rink passes is equal to 8.

For safe operation on the roller, it is necessary to comply with the general safety requirements for the operation of construction machines specified in GOST 12.3.033, GOST 25646 and the instructions of section RE.

Timely and high-quality maintenance of the rink increases its resource and dramatically reduces downtime due to sudden failures, reduces labor and material costs for its operation.