FR2461565A1 - Large plastic cylinders produced on site - where resin and glass are rotationally cast inside cylinder mounted on trailer - Google Patents

Abstract

Plastic cylinders and GRP in partic. are produced by rotation moulding with the resin fed into a rotated cylindrical mould, the mould and/or resin feed arrangement being hinged and mounted on a mobile vehicle. Cylinders of large dia., even beyond 4 metres, can be produced on site, e.g. for tanks or silos, simple processes.

Description

The present invention relates to a device for the production of hollow cylindrical parts made of synthetic material, and in particular of synthetic material reinforced with glass fibers, by the technique of rotational molding, with a loading device for introducing the plastic mass. in the mold and with a hollow cylindrical mold, rotating under the action of a rotary device and intended to receive the plastic mass.

 Are known, for the manufacture of silos or the like, devices with which a synthetic material and glass fibers are loaded into a hollow cylindrical mold, rotated by a rotary device. The synthetic resin uniformly sits in the mold under the effect of the centrifugal force.

Following complete hardening, a hollow cylindrical part can then be extracted from the mold. Parts made in this way typically have diameters of up to four meters. Large diameter parts pose transport problems, so their manufacture is generally not worthwhile.

 In order to be able to manufacture hollow cylindrical parts having even diameters greater than four meters, he has already proposed mobile installations with which a hollow cylindrical part can be produced by winding glass fibers and adding synthetic material to a mold. . However, these devices have the drawback that they require a relatively complicated initialization, which places high demands on service personnel. It is particularly advantageous that, as before, the cover and the bottom of a tank must be composed of prefabricated elements or manufactured on site by manual coating of a mold.

 The object of the invention is therefore to provide a device with which it is possible to manufacture relatively #im # on the site provided for the installation of receptacles, tanks or silos, parts of approximately hollow cylindrical shape in material synthetic, with diameters which can even exceed four meters.

 According to the present invention, this object is achieved by the fact that, in a device of the type defined in the preamble, the mold and / or the loading device are pivotally mounted on a vehicle. This allows the mold to pass from a position in which its axis is practically vertical to a position in which its axis is practically horizontal, and vice versa. To manufacture the parts, the vehicle is driven to the point provided for the installation of the container, tank or the like. In order to facilitate transport, the mold is preferably removable in several parts. The assembly of the mold is carried out in an extremely simple way when its axis of rotation is vertical. After having assembled its elements, one can then rotate the mold in the position of use, in which its axis of rotation is horizontal. Another advantage is the possibility to rotate the mold. Indeed, it is possible to close on one side the hollow cylindrical mold by a mold part having approximately the shape of a circular plate. On this part of the mold, synthetic resin and glass fibers can be applied, while the axis of rotation is erected vertically and the mold rotates at a relatively slow speed, to form a bottom or a container lid. This part of the mold is conveniently curved, so that the bottom bulging results, which is desirable for static reasons in the case of tanks.

It is advisable that the hollow cylindrical mold is provided, at least on one side, with a concentric groove for the formation of flanges on the part. This allows parts to be made which can be arranged one on top of the other, to build a tank of any size desired.

 The loading device is conveniently equipped with a device for leveling the interior surfaces of the room. This provides the possibility of also manufacturing, with the device, parts having a sandwich structure, that is to say comprising a layer of synthetic foam between two layers of plastic. In this case, the part can be manufactured by first producing a layer of plastic material by the technique of rotational molding, then by forming a layer of foam. Following the complete hardening of the foam layer, the uneven surface of this layer is leveled and the inner layer of plastic can then be applied.

 The mold part in the form of a circular plate is advantageously detachable from the hollow cylindrical mold, in which case the hollow cylindrical mold is formed of cylindrical elements and the part in the form of a circular plate is made of cover elements. This mode of subdividing the mold makes it possible to store it with a reduced bulk on the vehicle for transport.

 It is particularly advantageous that the device is designed so that the mold can be placed on the ground.

We can then do without a crane to extract the part and place it on the ground.

 The mold can be mounted on an arm which is articulated on the vehicle and which can be pivoted by means of a motor device. In this way, filling is carried out with simple means, the condition required to be able to rotate the mold in a vertical or horizontal position. However, it is particularly advantageous for the arm to have two elements assembled by an articulation ##, the position of one of these elements relative to the other being able to be modified by a control member. In this case, the arm can also be used to deposit the mold on the ground, by modifying the position of one of the elements relative to the other element.

 If the mold comprises at least two half-molds or parts of mold, mounted on carriages and movable radially in the direction of their approximation and their mutual distance by means of a control device, the part produced in the mold can be removed therefrom easily. This is particularly the case Brsqubn rotates the molded part by 1800 by means of the arm described, so that the mold element in the form of a circular plate is located at the top when the mold is opened.

 The carriage guides advantageously form a rigid frame which is rotatably mounted in the middle. This gives rise to a favorable structure from the construction point of view.

It is advantageously provided, for the mounting of the mold, a pivoting ring or a hollow axis, by which the loading device can be supplied with material for making up the part. While in the case of fixed installations, the device the material is supplied by the periphery of the hollow cylindrical mold, the new proposed embodiment results in a particularly favorable structure for mobile installations, making it possible in particular to lower the mold on the ground for the removal of the room.

 The loading device is advantageously mobile, both in the axial direction and in the radial direction relative to the mold. This makes it possible to manufacture, with a single loading device, both the hollow cylinder and the cover of the part.

According to an appropriate embodiment of the loading device, there is provided a carriage movable along a guide fixed to the arm, carriage on which is fixed a lever arm, the casting head being movable in axial direction with the carriage and in radial direction with the lever arm. With this embodiment, a simple construction of the loading device is achieved, which is entirely housed inside the mold and which can be folded into a small space when the part is placed on the ground and can thus be easily removed by the opening in the cover.

It is advantageous that the casting head of the loading device is pivotally mounted. This allows the same casting head to be used, both for the manufacture of the hollow cylinder of a part and for that of its cover.

 Two exemplary embodiments of the device followingltmventbn are shown in the drawings.

 Fig. 1 is a side view in partial section of a first embodiment of the device, consisting of the mold shown in section with the loading device, in a vertical position for the casting operation of the cylinder, installed on a semi-trailer vehicle.

 Fig. 2 is a top view in partial section of the device shown in FIG. 1, the material tanks, the transport devices and the glass fiber magazine, installed on a second semi-trailer vehicle, also being visible.

 Fig. 3 is a side view of the device, the mold being in a horizontal position for the bottom casting operation.

Fig. 4 is a top view of the device of FIG. 3, with the material reservoirs and other accessories shown in FIG. 2.

 Fig. 5 is a side view corresponding to FIG. 3, the mold being open for demolding the finished part, which is lifted out of the open mold by means of a construction crane.

 Fig. 6 is a top view of the device shown in FIG. 5, the loading device having been placed on the side by pivoting, with indication of the possible points of installation of the silo to be built.

Fig. 7 is a side view of a silo shown under construction, consisting of several cylindrical segments, the drawing showing the already finished upper part, supported by lifting elements, and the element immediately following quiet slipped from below.

Fig. 8 is a top view illustrating the operation of FIG. 7.

 Fig. 9 shows a flange for the screw assembly of cylindrical segments.

Fig. 10 shows a flange for the assembly by gluing of cylindrical segments
Figs. 11 and 12 are a side view and a top view of a second embodiment of the device according to the invention, the mold being disassembled into elements for its transport.

In this embodiment, the material tanks, the conveyor devices for the synthetic material and the glass fiber magazine are on the same semi-trailer vehicle as the mold.

 Fig. 13 is a side view of the device shown in FIGS. 11 and 12, the mold being shown in section and in a vertical position for the casting operation of the cylinder.

 Fig. 14 is a side view similar to that of FIG.

13, but the mold being in a horizontal position for the bottom casting operation.

 Fig. 15 is a top view of the installation shown in FIG. 14.

 Fig. 16 is a view similar to that of FIG. 15, but after a 180Q pivoting movement of the mold from the horizontal position of FIGS. 14 and 15, in order to place the piece on the ground.

 fig. 17 is a top view of the mold in the position shown in FIG. 16, the mold being however opened in order to release the part.

A cylindrical mold 11, in two or more parts, is mounted on a rotary device 13 in such a way that parts of this mold, for example two half-molds 15, 17 can be separated radially from each other, being fixed respectively on carriages 23, 25 (fig. 6) movable on two parallel guides 19, 21. The guides 19, 21, which guide the two carriages 23, 25, form a rigid frame 27 which is rotatably mounted in its middle, for example on an axis 26, and which can be driven to rotate the mold. The whole is mounted at the external end of an arm 29 which is hingedly attached at 30 to the rear of a semi-trailer vehicle 31 and which can be raised and lowered by a motor device, for example a hydraulic cylinder 33.

The mold 11 has, at its two ends, grooves 35 which form assembly flanges 39 on the hollow cylinder 36 (FIGS. 9 and 10) of the finished part or of the element 37 and which serve at the same time to reinforcement of the part. In addition, the mold 11 comprises, on the side of its mounting, a mold element in the form of a circular plate cover 40. This makes it possible to manufacture, with the same mold, parts 37 having the form of a hollow cylinder 36 provided flanges 39 or the shape of a hollow cylinder 36 provided with a cover 41 (fig. 7). The cover 41 advantageously has an opening 42.

 Depending on its diameter, the mold 11 is composed of several mold parts or sectors 73 whose dimensions are chosen so that they can be assembled by screwing, for example using the construction crane 45, or disassembled in view of road transport and placed on the vehicle 31 (fig.

11 and 12) without exceeding the authorized dimensions for road transport. We are thus assured of a completely independent movement of the device from one site to the next.

 The loading device 47 is fixed on the arm 29 in such a way that it can be placed by pivoting, at the same time as the mold 11, in the horizontal and vertical positions.

 The precise distribution of the plastic mass in the mold 11 is carried out by the pivoting casting head 49, movable in the longitudinal and radial directions. It follows that with the same device, the part 37 can be cast with or without cover 41, without modification of the equipment. By varying the speed of advance of the casting head 49, it is possible to vary the wall thickness of the part 37 as necessary, in order to make the most of the raw material. The mold II and the loading device 47 are advantageously controlled by an installation independent of the network (not shown). To stabilize the device, two struts 50, 52 are provided at each rear and front end of the vehicle 31.

The synthetic material is supplied by pressurized lines, under the action of special transport devices, for example a pump 53, from reservoirs 55 which are mounted, with the glass fiber magazine 57, for example on an accompanying vehicle 59.

 The loading device 47 can also be equipped with a device (not shown) intended to equalize the interior surfaces of the part 37.

 To cast the hollow cylinder 36 of the part 37, the mold It is lifted in the vertical position shown in FIG. 1 and rotated. When the plastic mass, introduced into the mold 11 by the pouring head 49 moving back and forth, has completely hardened, the mold ll is lowered into the horizontal position shown in FIG. 3.When we need a hollow cylindrical element 36 provided with a cover 41, for example as an element from the top of a silo 61 (fig. 7), we then proceed to the operation of pouring of the cover 41. #iIf use of the hollow cylinder 36 does not require a cover 41, the part 37 provided with two assembly flanges 39 (FIGS. 9 and 10) can already be removed from the mold. To this end, the assembly elements (not shown) provided8 on the mold 11 are detached, the half-molds 15, 17 are separated from one another and the part 37 is released (fig.

6). If the cover 41 of an element is used at the bottom as a bottom, this element is in the correct position in the mold 11 and it suffices to remove it and bring it down next to the device. But if the cover 41 is used at the top, for example as made from a silo 61 (FIG. 7), the finished part 37 is lifted out of the open mold 11, returned to the suspended state, for example on a rotation device # 63-hooked to a construction crane 45, then removed.

 So that no scaffolding is necessary for the construction of a silo 61 composed of several superimposed elements 37 (fig. 7), we begin by manufacturing the element 37- from the top, consisting of a hollow cylinder 36 and of a cover 41, and it is lifted by a segment length by means of the lifting devices 65, so that the following element 37 can be slid below, by means of the supports 67 fitted with rollers. When the lower element 37 has been put in place, the upper part of the silo 61 is lowered and joined to the lower part, which can be carried out as required by screws 69 (FIG. 9) or by gluing (FIG. 10) In this way, we are sure that all the operations relating to the assembly of a silo can be carried out on the ground, which can be carried out with the minimum of costs and the maximum of safety for the personnel and for the material. .

The second embodiment of the invention, shown in FIGS. 11 to 17, differs in particular from the first embodiment by the fact that the loading device 47 is supplied with synthetic material and / or glass fibers through a hollow pin or a swivel ring 71 and by the fact that one can rotate the mold 11 from 1800 from the horizontal casting position or from 900 from the vertical casting position, to deposit on the ground ( Figures 16 and 17) the part 37 produced in this mold (Figure 7).

In this way, the crane provided in the first embodiment is superfluous and the space available additionally on the vehicle 31 can be used for the tanks 55, the transport means: of synthetic material 53 and the glass fiber magazine 57. In outside of that; the structure of the device is essentially the same as in the embodiment described above and, for this reason, the same reference numbers have been used.

 the mold 11 consists of two half-molds 15, 17 (FIG. 17) which are in turn formed of five sectors 73. These include a hollow cylinder part 74 and a cover part 75. For transport, the elements 74, 75 can be arranged on the vehicle 31 as shown in FIGS. 11 and 12.

In addition to the subdivision shown, it goes without saying that other subdivisions of the mold are also possible.

Each cover portion 75 of a half-mold 15, 17 is connected to a carriage 23, 25. These carriages 23, 25 move in parallel guides 19, 21 which are connected between them form a fixed frame 27. This frame is rotatably mounted in the middle and can be driven by a rotary device 13, in order to rotate the mold 11. The opening and closing of the mobile 11 are ensured for example by threaded rods 77 capable of being controlled by a motor (not shown).

 The mounting of the frame 27, on which the mold 11 is disposed, is carried out by means of a pivoting ring, and more precisely of a ball pivoting ring 71 provided with internal toothing, according to the known embodiment. per se for pivoting cranes. with the internal toothing is engaged a pinion 81 which is controlled by a motor 83. But this assembly could also be carried out on an axis, in which case this would be expediently carried out in the form of a hollow axis so that the loading of synthetic material and glass fiber can be carried through it. This loading mode is useful when the part must be placed on the ground with the mold, as shown in fig. 16.

 For the longitudinal movement of the casting head 49, the loading device 47 has, as can be clearly seen in FIG. 13, a U-shaped guide 85, mounted on the arm 29 and passing through the center of the mold 11, guide on which a carriage 87 can be moved by the motor 89, by means of a threaded rod 91 indicated in points and in dashes in fig.

 11. In this way, the casting head 49 can perform the back-and-forth movement indicated by the arrows 92. The molded head 49 is pivotally mounted on a radial lever arm 93, advantageously telescopic, which is fixed on the carriage 87.Delasort * - the casting head can also be moved in the radial direction by the control mechanism 95, for example a threaded rod, as indicated in fig. 14 by the arrow 92. The telescopic shape of the lever arm 93 is advantageous so that after having produced a part provided with a cover 41, the loading device can be housed in a small space in the center of the mold, which makes that when the part is placed on the bowl, this device can be extracted without difficulty from the opening 42 of the part 37.

The pressure lines 51, which convey from the pump 53 to the loading device the synthetic material pumped into the reservoirs 55, pass through the pivoting ring 71.

 For the casting of a hollow cylindrical part 37, the mold II is lifted in the vertical position shown in FIG. 13, set in rotation and loaded with synthetic material and glass fibers. When the plastic mass has completely hardened, the mold is lowered into the horizontal position shown in fig.

14 and open. In this way, the manufactured part 37 can be placed on the ground, without even needing to use a crane. For this to be possible in a simple manner, the mold 11 is mounted on an arm 29 which is pivotally articulated at 30 on the vehicle 31. The pivoting movement of the arm 29 is ensured by the control mechanism 33, a hydraulic cylinder. The arm 29 is made up of two L-shaped elements 96, 97 articulated together, the position of one of the elements 97 relative to the other element 96 being able to be modified by means of a control member 98.

 When the mold 11 is in the horizontal position shown in FIG. 14, the actuation of the hydraulic cylinder 33 causes a pivoting movement in the vertical position shown in FIG. 13. If the control member 98 is then actuated again, there is a pivoting in the position shown in FIG. 14, as is necessary for depositing the part 37 on the ground.

Claims (11)

1. Device for the production of hollow cylindrical parts made of synthetic material, and in particular of synthetic material reinforced with glass fibers, by the technique of rotational molding, with a loading device for the introduction of the plastic mass into the mold and with a mold having approximately the shape of a hollow cylinder and rotating under the action of a rotary device for receiving the plastic mass, characterized in that the mold (li) and / or the loading device (47) are mounted pivoting on a vehicle (31). 2. Device according to claim 1, characterized in that the mold (ll) is removable in several parts (73) for transport. 3. Device according to claim 1 or 2, characterized in that the hollow cylindrical mold (ll) is closed on one side by a mold part (40) having approximately the shape of a circular slide. 4. Device according to claim 3, characterized in that said mold part (40) is curved. 5. Device according to any use of claims 1 d 4, characterized in that the hollow cylindrical mold (ll) is provided, at least on one side, with a concentric groove (35) for the formation of flanges (39 ) on the part. 6. Device according to any one of claims 1 to 5, characterized in that the loading device (47) is equipped with a device for 11 equalization of the interior surfaces of the part. 2 Device according to any one of claims 1 to 6, characterized in that the mold part (40) in the form of a circular plate is detachable from the hollow cylindrical mold (11), and in that the hollow cylindrical mold (11) is formed from hollow cylinder elements (74) and the circular plate-like part (40) is formed from cover elements (75). 8. Device according to any one of claims 1 to 7, characterized in that the mold (I1) can be deposited on the ground. 9. Device according to any one of claims 1 to 8, characterized in that the mold (11) is mounted on an arm (29) which is articulated on the vehicle (31) and which can pivot #ous the action of 'a control device (33). 10. Device according to any one of claims 1 to 9, characterized in that the arm (29) comprises two elements (96, 97) hinged together, the position of one of these elements (97) relative to the other element (96) being able to be modified by a control member (98). 11. Device according to any one of claims 1 to 10, characterized in that the mold (ll) comprises at least two half-molds (15, 17) or parts of mold, mounted on carriages (23, 25) and radially movable in the direction of their approximation and their distance under the action of control devices. 12. Device according to claim 11, characterized in that guides (19, 21) for the carriages (23, 25) form a rigid frame (27) which is rotatably mounted by its middle.  HE. Device according to any one of Claims 1 to 12, characterized in that, for mounting the mold (11), a pivoting crown or a hollow pin (71) is provided through which the loading device (47) can be supplied with material for forming the part (37).  14. Device according to any one of claims 1 to 13, characterized in that the casting head (49) of the loading device (47) is movable relative to the mold (11), both in the axial direction and in the radial direction. 15. Device according to claim 14 or 15, characterized in that the loading device (47) comprises a carriage (87) which is movable along a guide (85) fixed on the arm (29) and on which is fixed a telescopic lever arm (93), the casting head (49) being movable in axial direction with the carriage (87) and in radial direction with the telescopic lever arm (93). 16. Device according to claim 14 or 15, characterized in that the casting head (49) of the loading device (47) is pivotally mounted.