A METHOD FOR ARRANGING THE COOLING IN A COMPACTOR AND A COOLING SYSTEM FOR THE REALIZATION OF THE METHOD

Abstract: The object of this invention is a method of arranging the cooling in a compactor equipped with at least one roller drum (5, 23), in which the motor (1) and/or other equipment, for example the hydraulic system (2) has forced circulation water cooling (4) or water cooled forced circulation air cooling. In the invention the cooling water or oil to be cooled is circulated through a heat exchanger (25) located in the roller (23), from which the heat is transferred to the outer cover (24) of the roller (23) by means of cooling water arranged in the roller or by setting the heat exchanging surface (29) directly against the outer surface of the roller (3).

Description: A Method for arranging the Cooling in a Compactor and a Cooling System for the Realization of the Method The object of this invention is aunethod for arranging cooling in a compactor equipped with at least one roller drum, and in which the motor and/or other equipment, for example the hydraulic system, has forced circulation water cooling or water cooled forced circulation air cooling. The invention is also directed at a cooling system intended to realize the method. In this the circulation water means any liquid medium at all that is intended to transfer heat, most typically a mixture of water and an anti-freeze agent. The oil circulation circuit means the circuits of an hydraulic system at its most typical. In an ordinary cooling system the hot water coming from the motor is led to a cellular radiator, in which efficient heat transfer is aimed at by a large ribbed surface area. The working conditions of compactors are, among other places, garbage tips and coal fields, which are very dusty. This causes choking in the cells of the radiator, which often leads to the motor overheating. Taking the area of the invention broadly it in¬ cludes the US publication 4342485, which shows sprinkler cooling of a planet gearbox installed inside the drum of a surface compactor for as¬ phalt or concrete roads. According to this the cooling is improved by partially filling the drum with cooling liquid, which effectively con¬ ducts the heat from the surface of the gearbox to the surface of the drum A compactor cooling system, in which either the cooling water of the motor or of a separate auxiliary cooling circuit is made to travel through a roller drum, when it washes against the outer cover of the drum and thus gives up its heat to it, is known from the Finnish Patent Appli¬ cation 853991 (corresponding to PCT/Fl86/001l6). This is realize most simply in such a way that the circulating water it fed in through one end of the drum roller and out through the other end. Two revolving pipe connectors are required for this. The intention of this invention is to create a simpler and more effec¬ tive cooling method than before in roller-cooled compactors, and a cool¬ ing system to realize the method. The characteristics of the method in accordance with the invention appear in the accompanying Patent Claim 1 and of the cooling system intended to realize the method in the accom¬ panying Patent Claim 2. SUBSTITUTE SHEET In the following the invention is more closely illustrated by means of descriptions and accompanying figures, which present some forms of application of the invention. Figure 1 shows a compactor, in which there is roller drum cooling. Figure 2 shows an outline diagram of the cooling system. Figure 3 shows one other kind of cooling system. The power of the motor of a large compactor is typically 400 hv. In a compactor of this kind cooling power amounting to about 110 kW at most is required when the cooling required by the hydraulic system is taken, into account as well. The length of the roller in Figure 1 is about 4m and its surface area is sufficient to transfer the heat from the roller even in hot conditions. In a smaller size of compactor than the previous one "h motor power is typically 300 hv and the length of roller correspondingly 3m. The length of the roller and thus its heat transfer surface area is nearly proportional to the size of the compactor and its motor in compactors with a modular construction. Heat is transferred from the roller principally to the ground, because the effectiveness of transfer to the air is small unless it is improved by means of ventilation and sprinkling. Often, however, the material to be compacted, for example rubbish on a garbage tip, is so wet that "the sur ace of the roller becomes wet and the heat transfer is improved naturally too by means of the phenomenon of evaporation. In compactors used in among other things the compaction of garbage spikes are placed on the rollers and these considerably improve the heat transfer, as in the compactor in Figure 1. It is advantageous if the water is able to circulate in the spikes. This figure shows a " system, in which the cooling circulating water inlet pipe is connected to the end of the roller 3« In Figure 2 a cooling system is shown for the next smallest compactor size after the previous one. The roller drums of the compactor ;are= of different sizes and in the same way the heat transfer surfaces areas are thus different. In this cooling system the circulating water circuit of the motor 1 and oil circulation circuit 22 of the hydraulic system 2 include cooling heat exchangers 25 and 28 which are located inside the rollers 23 and 26, when additional pumps are not needed at all. In connection with the rollers 23 and 26 of different size the cooling power can be adapted directly to correspond to the cooling power re¬ quired by both the motor 1 and the hydraulic system 2 in such a way that the larger roller 23 is used for the cooling of the motor 1 and the smaller roller 23 is used for the cooling of the hydraulic system 2. The cooling of the motor 1 takes place by means of the heat exchanger 25 which belongs to the circulating water circuit 4 and is located in the roller 23, and from which heat is transferred to the cooling liquid inside the roller and by means of this to the outer cover 24 of the rol- ler. As the roller 23 revolves the heat is transferred both from the I heat exchanger 25 to the coolant and from it in turn to the outer cover 24 with the aid of forced convection, as the revolution creates a con¬ siderable speed of flow in the coolant. The cooling of the hydraulic system 2 operates in a corresponding manner in the smaller roller 26. Heat is transferred from the oil circulation circuit 22 from the heat exchanger 28 in the roller 26 to the coolant and from this in turn to the outer cover 27. An alternative method of installing the heat exchanger in the roller is shown in Figure 3- In this the water and oil circulation connections to the roller drum 3 are of the same kind as those shown in application FI853991. The circuits to be cooled are connected to the reveolving roller by means of the connector 15, which permits revolution and which is installed inside the axle pin 9- In this case the heat transfer sur¬ face can be welded permanently directly to the outer cover 5 of the roller drum 3, when the heat exchange is especially effective.

Claims: Patent Claims 1. A method for arranging the cooling in a compactor equipped with at least "one roller drum (23), in which the motor (1) and/oτ other equip- ment, for example a hydraulic system (2) has forced ciculation water cooling (4) or water cooled forced circulation air cooling, characterized in that the cooling water or oil to be cooled is circulated through a heat exchanger (25) located in the rolleE. (23) > from which the heat is- transferred to the outer cover (24) of the roller (24). 2. A cooling system for a compactor, intended to realize the method in accordance with Patent Claim 1, which includes a circulating water (4) or circulating oil circuit (22) cooling the motor (1) and /or other equipment to be cooled, which is made to travel through the roller drum (23, 26) to yield its heat from the roller to the ground and the air, characterized in that the circulating water or circulating oil circuit (4, 22) include a heat exchanger (25, 28) located inside the roller drum (23, 26) and that the roller drum (23, 26) is filled with cooling liquid to transfer the heat from the heat exchanger (25, 28) to the outer cover of the roller. 3. A cooling system for a compactor, intended to realize the method , in accordance with Patent Claim 1, which includes a circulating water (4) or circulating oil circuit (22) cooling the motor (1) and/or other equipment to be cooled, which is made to travel through the roller drum (3) to yield the heat from the roller to the ground and the air, characterized in that the circulating water or circulating oil circuit (4, 22) includes a heat exchanger located inside the roller drum (5),- the heat exchanging surface (»29) of whiih is set agaisnt the outer cover (5) of the roller drum (3).

Inventors: SINKKONEN MATTI, SINKKONEN, MATTI
Applicants: TANA JYRAE KY, TANA-JYRAE KY
Application year: 1988
Main classification: E01C19
IPC codes: B60K11, E01C19, E02D3