CS245697B1 - Media supply apparatus in a cylinder for heat treatment of thermoplastic sheet materials - Google Patents

Abstract

The device solves the problem of supplying the medium to the cylinder for the heat treatment of thermoplastic sheet materials. Its essence is that it consists of three coaxial pipes, passing through the entire length of the cylinder core. The supply and middle pipe are mounted in the cylinder shafts, the outer pipe is fixed. In addition, this outer pipe is provided with a bellows in its middle part. The supply pipe is provided with holes on the circumference in a part that corresponds to the same heat flow when the medium enters the middle pipe in the direction of both ends.

Description

245697 2

The invention solves the supply of heating medium to a cylinder for the heat treatment of thermoplastic fruit materials.

The hitherto known heat treatment cylinders for thermoplastic fertile materials (AO No. 202 945a AO No. 157 432) contain their own heating work surfaces, cylinders and, on the other hand, the supply of the heating medium. The rollers are connected to the second Selo and are connected to the heating or cooling medium inlet and their smallest cross-section to remove the medium. The number of channels is always even, and in half of the number of channels the reduction in cross-section is opposed to the second half of the channel number. The heating medium inlet and outlet is provided by means of pipes which are coaxially or parallel to the calender roll. The smaller diameter tube is the tube of the inlet tube, while the transfer space is formed by the annulus formed between the outer diameter of the smaller tube and the inner diameter of the tube. This arrangement avoids the loss of temperature of the supplied heating medium at its flow through the feed pipe, and fully complies with the calender rollers with the roller length.

The disadvantage of the described supply and discharge of the heating medium in the cylinder is that the heat of the larger cylinder rollers results in a greater decrease in the temperature of the medium in the cylinder. At a certain difference in the temperature of the outlet and inlet medium, an increase in the heat transfer coefficient can occur. that the heat exchange, between the feed and the exhaust, is higher (AO no. 202 945) than with the simple medium feed through the tube, which is led inside the heated cylinder (AO 6. 157 432). A further disadvantage is the fact that the medium tubing of the medium is heated significantly faster than the surface of the cylinder due to its lower weight. In the case of longer cylinders, due to the temperature difference between the roll surface and the tubes of the medium, there is a different dilatation which causes a greater strain on the inlet and drainage pipes compared to the tubes forming the calender roll and leakage of the inlet pipes at the point of connection to the cylinder pins. For these reasons, the design of the longer calender rolls has to be dispensed with, and the increased length of the rollers presents a greater risk of failure of the feed pipe joints.

These drawbacks are eliminated by the distribution of the heating medium in the heat treatment cylinder of the thermoplastic sheet according to the invention, the principle being that it consists of three concentric tubes extending the entire length of the hollow cylindrical core, the ends of which are supported in the cylinder faces so that the inner tubes are circumscribed. that is, the inlet and intermediate pipes are mounted in the end face, while the outer waste pipe is joined to the faces in a rigid manner in its central portion, the inlet pipe being circumferentially provided with openings corresponding to the same heat flow as the medium enters the middle pipe in the direction of both faces.

The device according to the invention still guarantees the same temperature of the medium in the inlet channels of the claw roll at any length of the cylinder, the interaction of the draining and feeding media is the same for both sides. The unequal dilatation of the medium distribution system and the cylinder casing produce a bellows for any length of the calender roll, the length of which is the construction of the cylinder. An example of the distribution of the heating medium in the thermoplastic cylinder of the thermoplastic materials is shown in the drawing, which is a longitudinal section through the klander roller. The heat treatment roller of the thermoplastic sheet material is formed by two faces 8, 6 carrying a cylindrical shell 11, with a coaxial hollow cylindrical core. The space between the core 13 and the jacket H is divided by an even number of equally wide helical channels 14 whose depth fluently varies from one face 1 to the other face% half of the number of channels 14 diminishing their depth opposite to the other half of the number of channels 14. of the heating medium is opposed and consists of three coaxial tubes 1, 2, J passing through

Claims (1)

The entire length of the hollow cylindrical core In the first selector cylinder, an inlet channel 2a is formed, an outlet channel 8, in a second sele 2 an inlet channel g and an outlet channel nj. The ends of the tubes 1, 2, 2 are disposed in the Seleche, g cylinders, that the two inner tubes, i.e. the inlet tube 7 and the middle tube 2, are slidable in Selech, g, while the tube 1 is with S1, 2. fixed. In its central part, the outer tube g is provided with a guide 12. The feed tube 1 is terminated by a partition 6 and is provided circumferentially with openings at a location which corresponds to the same heat flow when the medium enters the middle tube 2 in the direction of the two. in the tube 6 through the partition 6 and the heating medium is guided by the two cylinders through the intermediate ring formed by the outer diameter of the lance X and the inner diameter of the intermediate pipe 2 from where it is fed through the inlet ducts 2 and 2 to the side of the spiral channels 15 with a larger cross section. The medium is passed through these counter-directional channels 14 opposite to the side, so that the medium supplied by the inlet channel 2 of the first cylinder 6 after the heat transfer of the cylinder surface exits the working space through the outlet channel 10 of the second cylinder 2 and the medium supplied by the inlet channel g of the second Sela the rollers leave the working space through the outlet channel g of the first roll. Since the helical channels 14 have a cross-section in the flow direction, which gradually decreases, the flow rate increases, thereby increasing the heat transfer coefficient, and this causes the total amount of heat transferred to the work surface to be compensated for, otherwise decreasing the temperature drop of the medium. From the outlet channel 10 of the second cylinder 2, the medium is guided through the space formed by the annulus of tubes 2 and g. From the outlet channel of the first cylinder 6, the medium is guided by the first selo ε of the cylinder to the unsupported heating plant. the medium on the other side of the cylinder 2, cools the outlet medium located in the annulus of the tubes 2.ag and the newly introduced medium located in the annulus of the tubes 6 and 2 equally over the length of the cylinder and thus affects evenly the temperature of the medium supplied to the inlet channels 2a g. Thus, the same temperature of the medium in the inlet ducts 2 and 2 is guaranteed at any length of the calender roll. SUMMARY OF THE INVENTION A device for supplying a medium in a cylinder for heat treatment of thermoplastic sheet materials, wherein the cylinder is formed by two Sels carrying a cylindrical shell with a coaxial hollow cylindrical core and a counter-flowing medium, characterized in that it is formed by three concentric tubes ( 1, 2 and 3), extending the entire length of the hollow cylindrical core, the ends of which are embedded in the cylinder (4, 5) so that the two inner tubes, i.e. the supply tube (1) and the middle tube (2) are in Selech (4, 5) are slidably mounted, while the outer waste pipe (3) is rigidly connected to the (4, 5) and in its central part is provided with a bellows (12), the inlet pipe (1) being circumferentially provided with holes in-place which corresponds to the same medium flow heat flow into the center pipe (2) in the direction of both Sel (4, 5). 1 drawing