Heating block for forming machines polyurethane foam. (Machine-translation by Google Translate, not legally binding)

048 832 U

DESCRIPTION

Heating block for polyurethane foam forming machines.

The present Utility Model application consists, as indicated by its statement, in a Heating Block for polyurethane foam forming machines whose new construction, conformation and design characteristics fulfill the mission for which it has been specifically designed, with maximum safety and efficiency. .

More specifically, the invention refers to the sector of machines for the manufacture of polyurethane foam obtained by mixing two chemical components, such as isocyanate and polyol. Said raw materials before they can come into contact with each other must individually homogenize their respective surface tensions, or this is achieved after passing separately, first through a pressure station, generally obtained with hydraulic cylinders and secondly, through a thermal station, Generally made up of electrical resistances that heat the conduits prior to the spray gun to which the two raw materials already treated converge and in which the polyurethane foam is formed upon its exit and when it comes into contact with the atmosphere.

The recommended heating block is the component of the two twin thermal stations inherent in the aforementioned machine. It is formed by a compact metal mass, with a high degree of heat inertia, traversed inside by a raw material circulation path, made up of a series of externally heated circular section passages with a group of electric resistances and equipped with a purge. The resistances can be graduated independently, thus achieving great functional accuracy and the long path of circulation of the material through the interior of the block at constant temperature ensures perfect homogenization.

Other details and characteristics of the current Utility Model application will be revealed in the course of the description that follows, in which reference is made to the drawings that accompany this report, in which, somewhat schematic, preferred details are depicted. These details are given by way of example, making reference to a possible case of practical realization, but it is not limited to the details that are exposed there; therefore, this description should be considered from an illustrative point of view and without limitations of any kind.

Next we will list the various numbered elements in the drawings attached to this specification; (10) heater block, (11) block body, (12) inlet duct hole, (12a) threaded area, (13) circulation path, (13a) longitudinal duct hole, (13b) transverse duct hole, (13c ) vertical duct hole, (14) outlet duct hole, (14a) threaded area, (15) vent duct hole, (15a) threaded area, (16) electrical resistance.

Figure 1 is an external view of the recommended heating block, in which the inlet (12), outlet (14), drain (15) and electrical resistances (16) are seen, as well as the cut-off areas in sections that were represented in the following figures n^° 3, 4, 5 and 6.

Figure n^° 2 is a representative diagram of the raw material circulation path (13) inside the body of the block (11), the inlet mouth (12), longitudinal ducts (13a), transverse ducts (13b), vertical duct are indicated. (13c), purge mouth (15), outlet mouth (14), as well as the direction of circulation.

Figure n^° 3 is a 3-3 'section view of the body (11), according to figure n^° 1, the inlet hole (12), outlet hole (14), vertical conduit (13c) and electrical resistance (16) being indicated.

Figure n^° 4 is a 4-4 'section view of the body (11), according to figure n^° 1, the longitudinal ducts (13a) and the vent hole (15) being indicated.

Figure n^° 5 is a 5-5 'sectional view of the body (11), according to figure n^° 1, the transverse conduits (13b) and the electrical resistances (16) being indicated.

Figure n^° 6 is a 6-6 'sectional view of the body (11), according to figure n^° 1, the longitudinal conduits (13a), vertical conduit (13c) and electrical resistances (16) being indicated.

In one of the preferred embodiments of what is the object of the present Utility Model application, the heating block (10) was formed by a compact piece of a metallic nature, which by means of habitual machining procedures has been given a substantially parallelepoped shape. (11) and a series of holes (12), (14) and (15) have been drilled, see figure n^° 1, (13a) and (13c), see figure n^° 6 and (13b), see figure n^° 5, all of them communicated with each other, constituting a circulation path (13) of raw material, as indicated by arrows in figure n^° 2.

The inlet (12), outlet (14) and drain (15) ports, see figures n^° 3 and 4, are provided with both threaded areas with standardized threads (12a), (14a) and (15a), so that rigid pipes or external flexible hoses provided with standardized fittings can be coupled to the heating block.

The bores (13a) and (13b), machined in a through way respectively longitudinal and transversely to the body of the block (11), see figures n^° 5 and 6, are provided at their ends with standardized threaded threading areas (13d), so that they can be coupled with electric pyrotothermic rods (16), in the same way as at the entrance of the vertical bore (13c), see figure n ° 3 , the mission of the pyrothermic rods is to heat the recommended block and with it the matter that is made to circulate inside it.

The heating block (10) remains jointly attached to the machine of which it is appended by conventional means of flanges or screws, not represented in the figures that accompany the present invention patent application.

The main purpose of the invention is to gather in the smallest possible volume that of the body (11) of the heating block (10) of a labyrinthine circulation path (13) that allows the uniform and progressive heating of the polyol and isocyanate, without ne2

ES 1 048 832 It is necessary to design an excessively bulky block (10) and thereby involving an excessive expenditure of electrical current to heat it.

Sufficiently described in what this Utility Model consists of in correspondence with the attached drawings, it is understood that any detailed modifications that are deemed convenient may be introduced in it, as long as the recommended variations do not alter the essence of the remaining utility model. summarized in the following claims.