HU210511B - Fitting-set mainly for pipes used at milling industry - Google Patents

Abstract

The invention relates to valves in the form of fittings for piping for the equipment of Muehlen to forward koernige and / or pulverfoermige substances, distribute or shut off the flow of material. In order to be able to realize the control and monitoring of the Gutstroeme including the sampling with the same elements as possible of a family of faucets, a multi-part, bullet-shaped housing with a rotatable, multi-part spherical insert is proposed according to the invention, wherein the housing and the insert one or more, at different angles to each other have arranged OEffnungen, each penetrate the center of the sphere. By rotating the ball-shaped inserts in the housing, the outlets or entrances of the housing can be closed or at least one common transmission position can be achieved. Fig. 1 {pipe fitting; Formstuecke; ball-shaped fitting housing; multipart training; rotatable housing insert; Locking / Durchlaszoeffnung}

Description

A series of fittings, in particular for milling pipelines, which are intended to move and / or divert and / or divert material in the pipeline, in particular in powder or granular form, in a non-directional direction. Each of the fittings in the fitting family has a permeable interior with at least two inlets, at least one inlet and an outlet connection. Inside the fittings, one or more inserts are provided for permitting and / or reversing the passage of material in the pipeline, and the outside body of the fittings comprises spherical or spherical portions.

Used in the milling industry kinking pipelines, which generally have a downward-to-down path, must be interconnected in different ways. There are pipe fittings that can change the direction of material in the pipeline. A distinction is made between the relatively simple construction of the pipe connectors, which allow only a change of direction of the angle, the so-called. elbows and adjustable angled articulated elbows.

Among the latter are known articulated articulations such as in HU 195 291; patent. In the prior art, the hinge is formed by an outer spherical pivotable on the inner spherical shell. An external clamp is used to secure it to the desired angle position.

To distribute or combine powdered or granular materials carried in a pipeline from two locations pants are used. An adjustable baffle or flap located inside the pants can change the distribution of the material being transported. It is also known to place the baffle or damper in a position such that one or the other branch pipe outlet is closed, e.g. DE 3 911 424; patent.

This is also the principle used in the mill shut-off pipe fittings. It is a common feature of the prior art milling pipe fittings that different structural components are used to solve different technological tasks. Such can be found eg. in the product catalog of the German company Jacob.

Known pipe fittings are made of metal, except for articulated fittings, generally welded. Metal fittings have a high weight for larger diameters in the milling industry, so they can be securely connected only to flanged pipe ends. This requires the use of separate connecting elements and a separate sealing element must be provided at the joints to prevent dusting of the material being transported.

It is an object of the present invention to provide a family of modular assemblies made of economically manufactured, easily assembled, organically connected and interchangeable elements.

SUMMARY OF THE INVENTION The object of the present invention is to solve a pipeline connection with elements of a single assembly line that meets all technological requirements of the milling industry, i.e., changing, distributing, matching, reversing, blocking, and screening and sampling the material transported.

The idea of the invention is based on the recognition that a spherical body can be inserted into the spherical shell as an insert, so that the housing and the insert can be rotated in any desired space. One or more common through-holes can be provided anywhere on the housing and the insert and preferably pass through the center of the sphere. When the spherical housing is rotated on the spherical insert, the outlet openings of the housing are closed. However, there is always at least one situation in which the openings in the housing and the insert can be rotated to a common passage state.

It is further recognized that the spherical housing and the spherical insert therein can be cut into two identical portions such that the axis of the orifice extending therein is inclined at an angle other than right angles to the cutting plane. By rotating half of the insert and housing portions in the plane of the cut, the angles of the apertures of the openings in the half-pieces change relative to one another. In this way, it is also possible to reverse the pipes connected to the outlet openings of the spherical housing.

Keeping one of the two halves fixed and the other fully rotated, the exit opening on the rotated half piece describes a circular path, the plane of the circular path parallel to the cutting plane and the radius of the circular path depending on the angle of the cutting plane with the axis of the opening. The greater the radius of the circular path, the more the angle between the plane of cut and the axis of the opening differs from the perpendicular.

Further, it is apparent from the foregoing that the angle between the cutting plane and the axis of the orifice determines the possible positions of the pipe connected to the outlet of the spherical housing ma2

EN 210511 Β angular deviation. Within the maximum angular misalignment, rotation in the cutting plane of the two halves allows the axes of the through-hole and the pipes connected to the opening to be angled relative to each other. It is also within the scope of the present invention that within the spherical shell the spherical inserts can be moved independently of the housing and independently of each other, and together with them the openings therein may form a closed or open position. This recognition is based on the design of manifolds, shifters and shut-off assemblies made of spherical housing inserts.

In accordance with the object of the present invention, a series of fittings according to the invention, in particular for milling pipelines for continuously advancing and / or changing and / or diverting and / or diverting material, in particular powder or granular material, has a permeable interior. having at least two inlets, at least one inlet and at least one outlet connection, the interior of the fittings being provided with one or more inserts for permitting and / or reversing the flow of material in the pipeline and the outer casing of the fittings containing spherical or spherical portions - configured such that the spherical portions comprise at least two interconnected spherical shells, the flexible spherical shells being displaced they are connected by a permissive flange joint, the flange joint is snap-on on one spherical housing, the flange receiving groove is formed on the other spherical housing adjoining it, the size and shape of the flange and the groove are adjustable and allow the housing to rotate, they have one or more rotating surfaces which are coincident or intersecting, and preferably have the same angle with the axes of rotation, but which also form a dividing plane other than perpendicular, having an interchangeable insert in the interior of the spherical housing; and having one or more permeable cavities internally, the removable insert being secured to the spherical housing by a removable fastener, and at least one of the interconnecting spherical housing with the insert being rotatably mounted Found perpendicular direction to alter the position of the inlet and outlet port openings relative cranks are optionally incorporated.

A further feature of the assembly family of the present invention may be that the pivot arm extends through the spherical housing into the recess in the insert, and the plane of rotation of the pivot arm is parallel to the plane of the rotating surface of the spherical housing.

The spherical housing housing has a tubular clamping structure for its connection apertures, a tubular clamping assembly having an axial slit and one or more bores or threaded bores, and the bore or threaded bore exerting a force on the pipe conduit.

One feature of the assembly family is that the insert is housed in a ball housing housing with a 90 degree pivotable insert for sealing the outlet connection opening.

Another feature of the assembly family is that a single inlet spheroidal housing has a double spherical branched spherical housing and, within it, a spherically permeable insert or bidirectional alignment and / or two-way connection.

The spherical housing has a viewing opening for monitoring the flow of material and / or a temporary pipe outlet for draining the flow of material.

It is a feature of the invention that, with the same spherical diameter, a spherical shell housing having any flange is connected to a spherical shell housing having any groove.

According to any aspect of the invention, the passage cavity of the inserts having a single passage direction is cylindrical, whereas the passage cavity of the double inserts having a diverting passage is shaped by the action of their cylindrical rotary axes intersecting each other.

It is also a feature of the present invention that the flanged joints of the spherical shell housings have a retaining tab and a bore for receiving a tie on the retaining tab.

In a preferred embodiment of the assembly family according to the invention, the spherical shell housings and the inserts are made of flexible plastic.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is further illustrated by reference to the drawings, in which: In the accompanying drawings, Fig. 1a is a sectional view of an embodiment of an assembly according to the invention, a directional change-over assembly made of 45/90 ° spherical shell housings, Fig. Lb is a detail of a flange fit of the assembly halves.

Figure 2 is a side view and a side sectional view of another embodiment of the assembly of the present invention, the directional bending elbows formed of 22.5 / 45 ° spherical shell housings;

Figure 3 is a sectional view of a material alignment assembly made of a 90 ° branched spherical shell housing,

Figure 4 is a sectional view of a material alignment assembly formed of a 60 ° branched spherical shell housing,

Figure 5 is a sectional view of a directional changeover and shut-off assembly of 45/90 'spherical shell housings,

Figure 6 is a sectional view of a 90 ° branched spherical metabolism assembly;

Figure 7 is a sectional view of a 60 ° branched spherical housing assembly,

Figure 8 is a sectional view of a material distribution, change-over and shut-off assembly made of a 60 ° branching spherical shell;

Fig. 9 is a plan view of the insert in the lower part of the assembly formed of 60 ° branched spherical shell housings, in accordance with the intersecting plane IX-IX in Fig. 8;

Fig. 10 is a semi-sectional side view of a directional change elbow with a viewing opening;

HU 210 511 Β

Figure 11 is a sectional view of a temporary branching and sampler made of 45/90 ° spherical shell housings;

12-15.

3A is a perspective representation of some embodiments.

The direction modifier fitting shown in Fig. 1a illustrates the essence of the invention, the directional modification of the angles of the interconnected pipelines within the specified angles in any direction in space.

The assembly of the two assembled half pieces is formed by a 45/90 ° molded la. consists of a spherical shell housing and a spherical shell housing 2a also having a flange 45/90 °. The spherical shell housings 1a and 2a are provided with 45/90 ° single-core inserts 5a which are flush with their inner walls. The spherical housing la has an inlet connection 4a and a spherical housing 2a has an outlet connection 4b which can be connected to the ends of the pipeline by means of a pipe clamping device 7. In the position shown, the rotational axes 14a and 14b of the spherical shell housings 1a and 2a coincide. The conveyed material then passes through the interior 13 without any change of direction.

The hemispherical shells 1a and 2a, together with the inserts 5a contained therein, are joined in common planes on the inner pivoting surface 13a and the outer pivoting surface 13b shown in Fig. 1b. The two halves forming the assembly are completely symmetrical apart from the 8 flanged joints. In the spherical shells 1a and 2a, the inserts 5a are secured by a removable fastening element 9, preferably by a screw.

The two pre-assembled half pieces are connected to each other by means of an 8 flange joint. The flange 8a of the flanged spherical shell housing 2a may be snapped into the groove 8b in the wall of the grooved spherical shell housing la. The spherical shells 1a and 2a are preferably made of a resilient deformable plastic so that the fitting is relatively easy. The two halves are rotated relative to one another on the rotating surfaces 13a and 13b in the desired direction and then screwed through the holes 8c in the retaining tabs 8d to prevent further unwanted rotation.

The flange fitting 8 is shown in detail A 'in Fig. 1b, disassembled.

In each insert 5a, a pocket 11 is disposed axially perpendicular to the rotation surfaces 13a or 13b at an intersection of the rotational axes 14a and 14b of the spherical shell housings 1a and 2a. The rotary lever 10 is shown in Figures 5, 6, 7, 8 and 11. By means of the rotating lever 10, the upper half piece containing the insert 5a can be rotated on the rotating surfaces 13a and 13b to the position indicated by the "result line" in the figure.

Thus, the initially coinciding axes of rotation 14a and 14b, together with the through holes 6a, and the inlet connection 4a and the outlet connection 4b, are perpendicular to one another. With this reversing fixture, up to 90 ° change of direction can be achieved. The degree of modification is between 0 ° and 90 ° depending on the degree of rotation.

The maximum degree of angle change depends on the angle of the connection openings 4a and 4b with the rotating surfaces 13a and 13b parallel to each other. In the case of the assembly in question, this is exactly 45 °, which allows a maximum of 90 ° reversal. The designation 45/90 for spherical shells 1a and 2a and the insert 5a indicate the angle between the planar openings 4a and 4b and the planes of rotation surfaces 13a and 13b, respectively, and the maximum degree of rotation.

The degree of rotation is always twice the former angle, so in our example 2x45 °, i.e. 90 °. Of course, we can choose any value that is constructively justified. Based on our experience, the former, as well as the 22.5 / 45 ° angle bending bends and the 60 ° and 90 ° branching fittings, can meet all practical needs.

Figure 2 illustrates another embodiment suitable for minor direction change. Its structure and operation are exactly the same

1. Here, the axis of rotation 14a of the inlet port 4a and the axis of rotation 14b of the outlet port 4b are at a maximum angle of 45 ° to each other. The interconnected 22.5 / 45 ° groove-down spherical housing and the same angled spherical shell housing 2 and the inserts thereon also 22.5 / 45 ° 5c on the inner rotating surface 13a and outside the rotating 13b surface on each other.

The maximum change of direction in this case can be 45 °. The design of the flange connection 8 and the positioning of the detachable fastener 9 are the same. The tube clamp-like structure 7 is clearly visible in the half-view of the figure. The spherical casings down and 2c can be clamped to the ends of the pipeline by screws 7d, screws 7d into the threaded hole 7c.

Figure 3 shows a three-way terminal assembly. One half piece, i.e. the 45/90 ° homogeneous spherical shell housing located below, has a single outlet connection 4b. The housing of the 90 ° branched spherical shell 3b has a double connection opening 4c. In this arrangement, the assembly serves for material assembly, and can be used in the reverse position and for material distribution with the branches down.

The direction of the axes of rotation 14b and 14c of the double connection openings 4c formed in the branched shell housing 3b cannot be changed relative to one another. The common rotational plane of the two halves is the inner rotating surface 13a, on which both halves can be completely rotated. The rotation axis 14d is perpendicular to the rotation surface 13a.

The known insert 5a and the 45 ° bifurcated insert 5d are respectively attached to the detachable fastener 9 to the spherical housing la and the spherical shell housing 3b. The inner space 13 consists of a single passageway 6a and a double passageway 6b.

Figure 4 also shows a material retaining assembly. Its construction and operation are as described in Figure 3. The deviation is at an angle enclosed by the axes of rotation 14b and 14c of the double connection holes 4c of the upper half piece, which in this case is 60 °.

HU 210 511 Β

Accordingly, the upper half has a 60 ° branched spherical shell casing and a 60 ° bifurcated insert 5e. Here, on the rotating surface 13a, both halves can be completely rotated about 360 ° around the rotation axis 14d.

Fig. 4 shows a slit 7a of the tube clamping device 7a at the connection openings 4c, which facilitates the fitting of the assembly to the ends of the pipeline. The tube-clamping device 7 can be clamped after screwing in the manner described above.

The exemplary embodiments presented so far also illustrate that it is not necessary to apply seals to the fittings and piping connections to prevent dusting of the material being transported. The connection openings 4a, 4b and 4c of the spherical shells 1a, le, 2a, 2c, 3a and 3b, preferably made of lightweight and flexible plastic, are resiliently tensioned on the pipe.

Figure 5 shows a shut-off assembly which is a variation of the direction-change feeder assembly shown in Figure 1. In the 45/90 ° homogeneous spherical shell casing, the 45/90 ° single core insert 5a is positioned in the same way, but in the upper half piece, the 45/90 ° flanged globular shell body 2a is positioned 90 ° rotated , closing the outlet port 4b. In the case where the assembly is to be permanently used for closure, the insert 5a can be secured with the rotary lever 10.

The valve is also suitable for intermittent shut-off during operation. At this point, the insert 5a must be secured at the time of installation and then, after removing the removable fastener 9 (see Figure 1), with the rotary lever 10 extending into the seat 11 of the insert 5a by rotating the insert 5a 180 about the rotation axis 14d. the outlet port 4b is closed.

Re-opening or closing can be reintroduced at any time. For the outlet of the rotary lever 10, a slit gap 16 is formed on the spherical shell housing 2a.

In this version too, the fitting is capable of changing direction, i.e., connecting the pipelines in different directions.

Figure 6 shows a 90 ° metabolic converter, and Figure 7 shows a 60 ° converter. The former corresponds to Fig. 3 and the latter corresponds to the material consolidator of Fig. 4, with reverse installation. In these cases, the double connection openings 4c are facing downwards. At the inlet port 4a, the conveyance of material entering the assembly can be switched to one or the other port 4c.

The upper half consists in both versions of the same 45/90 ° homogeneous spherical shell casing and a 45/90 ° single core insert 5a fixed therein.

The lower half is shown in Fig. 6 as a 90 ° branched spherical shell housing and in Fig. 7 as a 60 ° branched spherical shell housing 3a. In both versions, the connection opening 4c is closed with the 45/90 ° single insert 5a.

With the rotary lever 10, the insert 5a can be rotated about the rotation axis 14d so as to change the open state of the connection openings 4c to closed and vice versa.

It is also true for the fittings used in this way that the half pieces can be rotated relative to one another on the rotating surface 13a, so that any pipe connection in this direction can also be realized. In the course of a change of direction, of course, the spherical shell la and the insert 5a attached thereto rotate together.

Figure 8 illustrates a versatile assembly. In appearance it corresponds to the 60 ° metabolic pattern shown in Figure 7. Here, however, the upper half piece in the 45/90 ° homogenous spherical shell la has a 45/90 'top distributor insert 5f, which is shown at the right side of the figure, where the spherical shell la is depicted. The lower half piece has a 45/90 ° lower distributor insert 5g in the 60 ° branched spherical shell housing 3a. Thus, a double passage cavity 6b is formed in the assembly both at the top and bottom.

The manifolds 5f and 5g are configured such that the upper manifold 5f can be rotated about the pivot axis 14d by rotating the rotary chute 10 in any position that allows any distribution of material between the two lower connection openings 4c. Thus, it is possible to distribute the material flowing through the inlet port 4a in any proportion from 0 to 100%.

The latter also means that the valve can be operated as a shut-off valve. In this case, by closing one or the other outlet port 4c, the entire amount of material flows through the open port 4c.

Fig. 9 illustrates a plan view of the distribution insert 5g of the section plane IX-IX in Fig. 8, located in the spherical shell housing 3a, with the intersection plane coinciding with the inner rotating surface 13a. In the plane of the inner rotating surface 13a, the contour lines of the lower distributor insert 5g and the contour lines formed at the outlet ports 4c are shown. Between these, a double permeability cavity 6b is formed. Fig. 9 shows only the fixed lower distributor insert 5g in the state of distribution of material to 50-50% outlet ports 4c.

Note that the metabolism assemblies shown in Figures 6 and 7 are also suitable for material distribution. To do this, the insert 5a in the branched spherical housing 3a or 3b must be positioned by means of the rotary lever 10 so as to occupy an intermediate position between the double connection openings 4c according to the desired distribution ratio.

A10. Fig. 2A is a variant of the directional change elbow already described in Fig. 2 with a sight opening 12 for monitoring the flow of material. The inspection opening 12 formed on the flanged spherical shell housing 2 can be opened by rotating the insert 5c. The rotated position is indicated by a "score line".

All. Figure 1 is a modification of the directional changeover assembly shown in Figure 1 for sampling purposes. In one of the figures, a sampling opening 17 is formed on the homogenous spherical shell housing la. The sampler opening 17 is normally closed by the insert 5a, and free material passage is made between the inlet 4a and the outlet 4b.

During sampling, the insert 5a can be rotated with the rotary lever 10 so that the outlet port 4b is closed. At the same time, the flow of material is released at the temporary tube nozzle 15 inserted into the sampling opening 17. A15 ide5

HU 210511 Β The ligament is called a "result line". Upon completion of sampling, the insert 5a may be reset to its original position.

A12-15. Figures 1 to 5 show illustrations of the most important types of the fitting family. When the two halves are connected, the contour of the outer rotating surface 13b is visible.

A12. Fig. 13 shows a directional bending assembly consisting of 22.5 / 45 ° down and 2c spherical housing housings, and Fig. 13 shows a 45/90 ° directional corrugation housing consisting of spherical housing la and 2c with connection holes 4a and 4b in perpendicular position. .

Figure 14 shows a 60 ° branching or splitting assembly, and Figure 15 shows a 90 ° version.

An outstanding advantage of the fitting family according to the invention is that it is possible to assemble assemblies which perform different functions by interchangeable and interchangeable elements.

The fittings are suitable for any spatial installation, and the connection pipelines may be closed in any direction. Branching or distribution fittings do not require a vertical or close to vertical arrangement.

The assembly line can be manufactured economically. The individual components are mass-produced, easy to assemble and install.

When installed, the connecting pipelines do not have to be flanged as with most milling fittings currently in use. The fittings of the present invention have a relatively low dead weight because they are made of a spherical shell housing and insert and are made of plastic. No damage due to corrosion.

There is no need to apply a separate seal between the fitting and the end of the pipe, because the direct clamp-like structure between the ball-box housings and the pipe end ensures tight sealing without transporting dust. The fittings require no maintenance during operation. Maintenance and repair require few spare parts because the components are interchangeable.

It is also possible to move the fittings remotely. For example, an electric motor or a pneumatic cylinder can change the position of the insert inside the assembly or change the relative position of the two halves of the assembly. Thus, automation can be easily accomplished by simply moving the rotary arms.

The invention is widely applicable. It is primarily designed for the milling industry but is also useful for other powdered or granular materials. Members of the product family can be advantageously used, for example, in feed plants or in fertilizer production to connect pipelines and to change, divide, and block the material transported.

Claims (10)

PATENT CLAIMS 1. A series of fittings, mainly for milling pipelines, intended for the continuous passage and / or diverting and / or diverting and / or diverting of material in the pipeline, in particular powdered or granular material, all fittings having a permeable internal space at least two inlets, at least one inlet and at least one outlet, are provided with one or more inserts in the interior of the fittings to allow and / or direct the passage of material through the pipeline and the outside of the fittings to be spherical, or comprising spherical portions, characterized in that the spherical portions are formed by at least two interconnected spherical shells (1a, le, 2a, 2c, 3a, 3b), the spherical shells (la, le, 2a, 2c, 3a, 3b) flange allowing flexible movement the flange fitting (8) is snap-on on one spherical housing (2a, 2c, 3a, 3b), the other spherical housing (la, le) receiving the flange receiving the flange (8a) the groove (8b) being formed, the size and shape of the flange (8a) and the groove (8b) being aligned with each other and allowing the spherical shell bodies (la, le, 2a, 2c, 3a, 3b) to coincide or rotate with each other they have one or more pivoting surfaces (13a, 13b) which have an intersecting axis of rotation (14a, 14b, 14c) and a rotary axis (13a, 13b) which preferably have the same angle but are non-perpendicular to the plane of rotation (13a, 13b). 2a, 2c, 3a, 3b) has a removable insert (5a, 5c, 5d, 5e, 5f, 5g) in its interior (13), and the inserts (5a, 5c, 5d, 5e, 5f, 5g) have a spherical shell having a spherical surface adapted to the housings (la, le, 2a, 2c, 3a, 3b) and having the same rotating surface (13a) and one or more passages within it having a hollow cavity (6a, 6b), the removable insert (5a, 5c, 5d, 5e, 5f, 5g) is attached to the spherical shell housing (la, le, 2a, 2c, 3a, 3b) by a detachable fastener (9); in at least one of the interconnected spherical shell housings (1a, 5a, 5c, 5d, 5e, 5f, 5g) provided with inserts (5a, 5c, 5d, 5e, 5f, 5g) perpendicular to the rotating surface (13a, 13b), a rotary lever (10) for changing the relative position of the outlet ports (4a, 4b, 4c) is optionally incorporated. Fitting assembly according to claim 1, characterized in that the pivot arm (10) is inserted through a spherical shell housing (1a, le, 2a, 2c, 3a, 3b) in the insert (5a, 5c, 5d, 5e, 5f, 5g). and the plane of rotation of the crank (10) is parallel to the plane (13a, 13b) of the rotating surface (13a, 13b) of the spherical housing (1a, le, 2a, 2c, 3a, 3b). Fitting family according to Claim 1 or 2, characterized in that the spherical shell housings (1a, le, 2a, 2c, 3a, 3b) have a pipe clamp-like structure (4a, 4b, 4c) for their connection to the pipe. 7) having a tubular clamp-like structure (7) having an axial slit (7a) and one or more bores (7b) or threaded bores (7c) and a connection opening (4a) in the bore (7b) or threaded bore (7c), 4b, 4c) a clamping screw (7d) for applying pressure to the pipeline. 4. Fitting family according to one of claims 1 to 3, characterized in that one of the spherical shells in the housing (1a, 2a, 3b) is rotatable by 90 degrees. The insert (5a) located within the assembly 210 is adapted to seal the outlet connection opening (4b, 4c). 5. Fitting family according to any one of claims 1 to 4, characterized in that the branched shell housing (3a, 3b) with the double inlet housing (1a, 3b) and the branching shell housing (3a) having a single inlet connection (4a), 3b) a single-flow insert (5a) or a double-ended insert (5d, 5e, 5f, 5g) allowing an adjustable flow. 6. Fitting set according to any one of claims 1 to 4, characterized in that the spherical housing (2c) has a sight opening (12) for monitoring the flow of material and / or a temporary pipe nozzle (15) for draining the flow of material. 7. Fitting family according to any one of claims 1 to 3, characterized in that, with the same spherical diameter, a spherical housing (2a, 2c, 3a, 3b) having any flange (8a) is connected to a spherical housing having any groove (8b). 8. Assembly assembly according to any one of claims 1 to 3, characterized in that the permeable cavity (6a) of the inserts (5a, 5c) having a single passage channel is shaped by the action of cylinders (14b, 14c) intersecting each other in a common plane. 9. Assembly assembly according to any one of claims 1 to 3, characterized in that the flange joints (8) connecting the spherical shell housings (1a, le, 2a, 2c, 3a, 3b) and the bore (8c) receiving the fastener on the fastening tab (8d). ). 10. The prescription family according to any one of claims 1 to 4, characterized in that the spherical housing (1a, le, 2a, 2c, 3a, 3b) and the inserts (5a, 5c, 5d, 5e, 5f, 5g) are made of plastic.