DE2256900A1 - DEVICE FOR MIXING INGREDIENTS OF SYNTHETIC PLASTIC COMPOUNDS - Google Patents

Description

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Cowie & Riding Limited, Blackburn / England

Device for mixing components of synthetic plastic masses.

The invention relates to a mixing device for mixing or blending of components or constituents of synthetic Plastic materials before starting synthesis, in particular for the production of foamed plastics.

In known mixers, the ingredients are placed in a mixing chamber inserted and through a rotating mixing tool in the form of a disc mixed with projections or wings, these projections or wings similar projections or Complementary wings on the walls of the mixing chamber. TJm to finish the process before beginning the synthesis and expansion

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Of the foam material is started, the mixed material must then be removed from the mixer and placed in a verse cline machine are intimately mixed, whereupon synthesis and foaming reactions are initiated and spread the mixture to form a thin layer or to make bulky products into one Form is introduced.

In known mixing devices, it is also not possible to add additives such as gel-forming agents to the mixture, since the Ingredients are not mixed enough to successfully add these additives.

The aim of the invention is to provide a mixing device of the type described Kind of creating which further use a blending device or a second mixer is unnecessary. A mixing device is to be created, which the components mixes sufficiently to allow additives such as gelling agents to be added.

This goal is achieved with a mixing device of the type described at the outset Type achieved according to the invention in that several coaxial mixing chambers are provided, through which one after the other Material flows, and that each mixing chamber contains a rotating mixing tool and the mixing tools on a common Drive shaft are attached. To enable an additive such as a gelling agent to be mixed in, is preferred an inlet is provided in the last mixing chamber in the direction of the material flow, which can be connected to a line, which connects the mixing device with a supply for such additives.

The walls of the mixing chambers and the mixing tool or rotors are expediently provided with a plurality of wings or projections which lay on arcuate or circular paths with gaps between the "and are arranged so that the paths on the chamber walls coincide with the gaps in the rotors and vice versa.

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22569Q0

The mixing tools can either be disc-shaped or the Have the shape of circular segments, which are attached to the drive shaft are that this is coaxial with them.

An embodiment of the mixing device according to the invention, is shown in the drawing and is described in more detail below. Show in the drawing

1 shows a longitudinal section of a mixing device according to the invention along the line I-I in Fig. 2,

FIG. 2 is an end view of the mixing device according to FIG. 1 from the right, and FIG

3 is a plan view of a segment of a segment according to the invention Device used mixing tool or rotor.

The device according to the invention is used when mixing and blending the components or constituents of synthetic plastic materials, in particular for polyurethane foam for use as reinforcement and underlay for carpets.

The device has a cylindrical body 10 through which an axial passage 11 defined at each end by a tubular extension 12 or 13 extends.

The interior of the body 10 is subdivided into three mixing chambers 14 and 15, which are arranged concentrically to the axial passage 11 in succession in the body 10 in the axial direction. The mixing chambers H ₅ 15 and 16 are separated within the body by two partition walls 17 and 18. The partition walls 17 and 10 are formed with central openings 19 and 20 for forming the axial passage 11.

A drive shaft 21 protrudes through the extension 12 and the three Mischkcjnmern in the axial passage 10 and ends at the leizben

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Mixing chamber 16, while the other approach 13 remains free. the The drive shaft 21 is rotatably mounted in the extension 12 on the end face of the body 10 and through a stuffing box seal 22 securely sealed. The drive shaft 21 carries three disk-shaped Mixing tools or rotors 23 »24» and 25 »which are keyed to the drive shaft 21 with wedges 26, 27 and 28, in order to be able to be rotated by this.

Each rotor 23, 24 and 25 consists of a substantially disc-shaped part which has a plurality of prongs or projections 29 on each surface. The projections 29 are arranged in a plurality of concentric circular paths which are concentric with the axis of rotation of the rotor and can be viewed as a result of the formation of gaps in a plurality of annular walls as shown in FIG.

The walls of each mixing chamber 14, 15 and 16 are similar Projections 30 arranged in a similar arrangement of concentric tracks, but with the tracks in the annular spaces are arranged between the tracks of the projections 29 so that they can be rotated relative to one another without hindrance.

The ingredients to be mixed are introduced through an insertion opening 31 in the extension 12 in which the drive shaft 21 is mounted, and inserted along an annular passage 32 in the boss that is adjacent to the first mixing chamber 14 the drive shaft 21 opens. The ingredients are in the mixing chamber 14 through an annular gap 33 between the Rotor 23 and the chamber wall and are inserted by the relative rotation of the projections 30 on the wall and the projections mixed on the rotor 23. The bestaid parts become radial to the circumference of the rotor 23 pushed outward and around the outer edge 34 of the rotor and sweeping radially inward over the opposite Surface of the rotor 23 and the other wall or partition 17 of the chamber 14 back.

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Aa a pimtet on Usafaxig c! © r © solved Mischkaisa @ r is © in inlet 335 svM Introduction of liquid additives such as IarTb © n _a lubricant = USXf ₀

The same process of introduction in the middle of the mixing chamber. 15 or 1β ₉ radial B © if © gKag outwards gum Usfang over "beaaoh =" bart © surfaces egg @ ntgpr © Qhsnd @ n Hotorsa 24 or © r 25 and the Eüclc-2 "?; Lir Ton & © s circumference radial towards the inside via the opposite plates of the eoters 24 or 25 to the central ejection "is in each of the two other mixers 15 and 16 of the mixing device

In the! © taten EisoMzasmev 16 is © in inlet 36 to the introduction of a lubricating agent at a point on the Ufflfaag of the Mixed Lsaiians

The Hieehmig leaves di @ last © Misclalsasimer through the second Attachment 13 to the other thicknesses of the body 10o

In order to prevent loosening caused by unscrewing the lugs from its supporting parts ₉ , the lug 12 is secured to its supporting part by a left-hand thread on the lug and a corresponding holder 37 while on the second lug and its corresponding holder 38 a right-hand thread is provided

The body is made up of six .gepreßten or deep-drawn parts 39, 40, 41 »42, 43 and 44, which are essentially disk-shaped with raised edges. The edges form the peripheral walls of the mixing chambers 14, 15 and 16, and the parts 39 to 44 are joined in pairs so that at each end the edge of one part is directed inwards and forms the corresponding end of the Moacher body, while the other parts are in pairs Are arranged back to back. The annular connecting z \ tfischen ile the edges of the T _e, which appears in the center of each mixing chamber at the peripheral wall, is known

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Way is sealed with a corresponding sealing ring 45.

Iho ifuiJten 'ti Fhu'iu'n Ln'ßondeu otn ^j r L1 af hon of the remaining <oppress' ^M ii oiii'i ''ps'iLjf'iioii fei in π nid each with a broad AiiHnehmiinf ¹ , I '' αΐιπ , ν luldr ^, ium win ι η Hin parts in their position fin if npiii an inu kt ι im ι ..ΐΗΐΐϋΡίν, βΓπί ¹ , t ulml, result in these recesses L ¹ Inirut f'ir · A \ *> Z u Jt ¹¹ I Ld t lon { ^j Jit "j ΚίίΙιΙ mi L Le Is *

A passage 4-7 is in the middle of the body, and through the. Edges of the parts are provided and is in communication with each of the spaces for the circulation of a suitable coolant such as a, B, water. The T _e ile 39 "to 44 are securely zusammengehaltsn by a plurality of uniformly spaced from each other circumferentially disposed bolts 40th

T) ί ο invention ί> t in bozu ^, to the number of in the mixing stock nlM im, ' ι / ι rl'in! η ti Mlüm 1 1 chambers not limited, there can be j ι iwul] 1 hui * πι ι i.rie αιΐΓ ·> ι eip.hr as three · mixing chambers ,

The shape of the protrusions on the rotors and chamber walls can be adapted for various purposes. If, for example, the approach for a material contains mineral fillers, the protrusions can be coarser than if no such fillers are used.

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Claims (5)

Mixing or blending of components or parts of synthetic plastic materials before the start of the synthesis ₉ in that several coaxial mixing chambers (H ₉ 15 ·. 16) are provided through which material flows one after the other ₉ and that each mixing chamber contains a rotating mixing tool (23 »24, 25) and the Mi'schwerkzeuge on a common drive shaft (21) mounted sir> d _o 2. Device according to claim 1, characterized in that that at the last mixing chamber (16) in the direction of the material flow an inlet connected to a line (36) is provided. 3. 'Device according to claim 1 or 2, characterized in that g e characterizes t that the rotating mixing tools (23, 24, 25) have the shape of disks or segments of a circle and the drive shaft (21). is arranged in the center of the corresponding circles. 4. - Device according to claim 3> thereby g e k e η η ζ e i c-hnet that the Miscliwerkzeuge (23, 24, 25) are each provided with a plurality of wings or projections (29), which are circular on both side faces of the blending tool Paths are arranged. 5. Apparatus according to claim 4, characterized in that the walls (17, 18) of the mixing chambers (14, 15 »16) each with a large number of wings or projections (30) in a similar arrangement to the one on the mixing tools (23, 24, 25) are provided, which are arranged such that the wings or projections (29, 30) on the mixing tools and the walls so interlock that the projections on one of these parts 30yb22 / 0859 between, can go through the gates of the opposite part. 6 device according to. Claim 4 or 5 »there. by gei: e η in. ζ calibrate η β t that the wings or protrusions (29 » 30) have the shape λ on teeth with abet and en to each other in , Direction of the ring-shaped paths as well as with distances between inner and outer paths » 3OBb22 / 0859