FI77075C - FOERFARANDE FOER ANORDNANDE AV AVKYLNING I EN VAELT OCH AVKYLNINGSSYSTEM FOER DESS GENOMFOERANDE. - Google Patents

Description

77075

The present invention relates to a method for arranging cooling in a roller with at least one drum roller, in which the motor and / or other devices, for example hydraulics, have circulating water cooling or water-cooled closed air circulation cooling. The invention also relates to a cooling system for carrying out the method. By circulating water 10 is meant here any liquid medium suitable for heat transfer, most typically a mixture of water and antifreeze. A circulating oil circuit most typically refers to circuits in a hydraulic system.

In a conventional cooling system, the hot water from the engine is led to a cell cooler, where a large fin area is sought for efficient heat transfer. The working conditions of the rollers are e.g. very dusty in landfills and coalfields. This causes clogging of the radiator cells, which often leads to engine overheating. Broadly within the scope of the invention is a solution according to U.S. Pat. No. 4,342,485, which discloses the irrigation cooling of a planetary gearbox mounted inside the drum of an asphalt or concrete road surface milling machine. Accordingly, cooling is enhanced by partially filling the drum with coolant, which efficiently conducts heat from the surface of the transmission 25 to the surface of the drum.

It is an object of the present invention to provide a new and simple method for arranging cooling in a roller and a cooling system for carrying out the method. The invention seeks to eliminate the above-mentioned contamination problem of known cooling systems. The features of the method according to the invention appear from the appended claims 1 to 3 and the appended claim 4 of the cooling system for carrying out the method.

In the following, the invention will be described in more detail by means of a description and the accompanying figures, which show some embodiments of the invention.

Figure 1 shows a roller with drum roller cooling 2,77075

Figure 2 shows a schematic diagram of the cooling system. Figure 3 shows the arrangement of the water connection to the roll

The engine power of a large roller is typically 400 hp. In such a roller, a cooling power of at most 110 kW is required, 5 when the cooling required by the hydraulics is included. The roll length of the roller in Figure 1 is about 4 m and its surface area is sufficient to transfer heat away from the roll even in warm conditions. What makes the invention particularly advantageous is that the length of the roll and thus its heat transfer area is almost proportional to the size of the roller and its motor in modular rollers. The drum roll cooling according to the invention can thus be easily applied and utilizing the modular manufacturing method in rollers of all sizes.

The heat is transferred from the roll mainly to the ground, as the power transferred to the air is small unless it is boosted by ventilation and growth. Often, however, the material to be rolled, for example in landfills, is so moist that the surface of the roll gets wet and the heat transfer is naturally enhanced by the evaporation phenomenon. Among other things, in the rollers used for compacting waste, spikes have been installed on the rollers, which significantly improve heat transfer, as in the roller in Fig. 1. This figure shows an arrangement in which the cooling circulating water supply pipe 10 is connected to the end of the roll 3. A more detailed description of this arrangement is given below.

For practical reasons, it is advantageous to use indirect cooling, in which the motor 1 has a separate circulating water circuit 25 4, which is cooled by means of heat exchangers 14 by an auxiliary circulating water circuit connected to the roll 3. The hydraulic oil cooler 13 is also installed in this auxiliary circuit, Fig. 2. In addition to the roller 3, the auxiliary water circuit includes supply and return pipes 10, 11, a pump 12 and the above-mentioned heat exchangers 13 and 14. In this circuit, the roller 3 also forms an expansion vessel when left there. gas space 8. It can be easily seen from Figure 2 that it is irrelevant to the invention, even though the engine has closed air circulation cooling instead of the water cooling described above.

The water heated by the motor 1 and the hydraulics 2 is led along the supply pipe 10 and through the rotary connector 15 through the shaft pin 9 of the roll 3 to the roll 3 and taken out at the other end.

3,77075

A circulating flow pump 12 in the flow circuit to the coldest point, i.e. before said heat exchangers 13 and 14.

In order to enhance the heat transfer, a blow 6 is applied to the roll 3, if necessary, and it is irrigated 7 with a small stream of water 5.

A key feature of the cooling system according to the invention is the connection of the circulating water pipes 10, 11 to the roll 3, Fig. 3. The roll 3 itself is essentially a stiffened cylinder with shaft pins 9 attached to the ends. A pipe 16 10 is arranged at the outer end. 15. This provides a tight connection, while allowing the roll 3 to rotate normally. The supply pipe 11 is connected in a corresponding manner to the other side of the roll 3.

The roller 3 is supported on bearings 17 mounted on a sleeve fixed to the frame 19. Traction on the roll 3 takes place by means of a sprocket 18. If the position of the bearing 17 and the sprocket 18 is changed and the bearing is partially fitted inside the roller cylinder, the water connection can be completely installed inside a frame housing of the same width.

Claims (4)

4,77075 A method for arranging cooling in a roller with at least one drum roller (3), wherein the motor (1) 5 and / or other devices, for example hydraulics (2), have circulating water cooling (4) or water-cooled closed-air cooling, characterized in that the cooling water is recycled through the roll (3) and is brought into contact with the outer shell (5) of the roll to transfer heat therefrom to the surrounding air 10 and ground. A method according to claim 1, characterized in that a blowing (6) is applied to the drum roll (3) acting as a cooler in order to enhance the heat transfer. 15 Method according to Claim 1 or 2, characterized in that the surface of the drum roll (3) acting as a cooler is wetted (7) with a small stream of water in order to increase the heat transfer by means of the evaporation phenomenon. 20 Roller cooling system for cooling circulating water heated by a motor (1) and other devices for carrying out the method according to claim 1, wherein the roller has at least one drum roller (3) mounted on its shaft pins (9), characterized in that the shaft pins (9) of the drum roller (3) ) channels are formed from the outer ends inside the roll and the ends of the shaft pins (9) comprise connecting connections (16) and rotary connectors (15) by means of which the supply and return pipes (10, 11) of the circulating water system are connected to the roll (3). 30