DK2333198T3 - Device and method for blowing blow-insulating material into insulating material chambers - Google Patents

Description

Description [0001] The present invention relates to a device for blowing blow-in insulating material - in particular, cellulose - into insulating material chambers of building elements.

[0002] Various devices for blowing blow-in insulating material into insulating material chambers are known from prior art. Essentially, they are distinguished by whether a closed insulating material chamber is filled through so-called filling openings using lance-shaped blow-in nozzles or an open insulating material chamber is covered with a filling hood and the insulating material chamber only closed once it has been completely filled and a visual inspection has been performed. The second variant is preferred for quality monitoring reasons.

[0003] EP 1 255 001 B1 shows a blowing device for blowing blow-in insulating material into insulating material chambers, having a blow-in hood, a pressing unit, and a levelling device. The blow-in hood, which has a perforated cover plate, is lowered onto the insulating material chamber to blow the insulating material in. The air which is required to blow the insulating material in, is evacuated through openings in the cover plate. These openings are arranged in a special pattern so that uniform filling should be achieved. After the insulating material chamber has been filled, the blow-in hood is lifted, and the insulating material which was blown in is pressed into the chamber using the pressing unit. Subsequent to the fill level being pressed in the chamber, the fill level is evened out using the levelling device to prevent inadequate and uneven filling. Simultaneously, the webs on which a plate sealing the insulating material chambers is applied are freed of filling material.

[0004] EP 0 841 444 B1 shows a filling device which covers at least the width or the length of the chamber to be filled and is moved across the chamber during filling. The filling device comprises a filling hood which consists of a funnel-shaped structure. The filling hood has a sealing plate on the front side in the direction of motion. This sealing plate should prevent blown-in material from escaping again at that point. On the rear side of the filling hood in the direction of motion, the blown-in material should be prevented from escaping by the material already deposited there.

[0005] The filling devices known from prior art all have the disadvantage that an even filling is not able to be achieved, or uniform distribution is only possible using complex auxiliary equipment. Furthermore, before the insulating material chambers are closed, the cross struts, which delimit the individual insulating material chambers, have to be cleaned in a separate work step and freed of insulating material.

[0006] The purpose of the invention is to overcome the disadvantages of the prior art. In particular, a uniform filling of the insulating material chambers should be ensured and the subsequent process steps - in particular, the closing of the insulating material chambers - simplified.

[0007] This task is solved by the device or method defined in the independent claims. Additional embodiments result from the dependent claims.

[0008] A device according to the invention for blowing blow-in insulating material - in particular, cellulose - into insulating material chambers of building elements has a cover element and at least one filling nozzle. The cover element is used to at least partially cover the insulating material chamber to be filled. The at least one filling nozzle is passed through the cover element and is used to introduce the blow-in insulating material into the insulating material chamber. The cover element has an air-permeable membrane on the side facing the insulating material chamber to be filled. The at least one filling nozzle is arranged in an opening of the membrane.

[0009] The filling nozzle can be firmly attached to the membrane. For example, said nozzle can, at its membrane-side end, be attached to a plate on which, in turn, the membrane is attached. Alternatively, the nozzle can, however, also be mounted perpendicular to the plane of the membrane and mounted movably relative to the membrane, so that, at the start of the blowing in, the filling nozzle extends deeply into the insulating material chambers to be filled. The filling nozzle can remain in its position during filling or can be pulled out of the insulating material chamber continuously or in phases. To this end, the plate must be designed such that appropriate movement of the filling nozzle is possible.

[0010] The fact that the insulating material chamber is covered with an air-permeable membrane during filling means that the air required to blow in the blow-in insulating material can escape uniformly through the air-permeable membrane. No discrete exhaust openings are required. This ensures a homogeneous filling of the insulating material chamber.

[0011] In this instance and below, a membrane is a separating layer which enables, in particular, the blow-in insulating material blown-in to be separated from the transport air. A membrane in this sense can have a single-layer or multi-layer structure. An air-permeable membrane does not have any discrete openings for discharging the air required for blowing in, but, rather, is air-permeable across its entire surface.

[0012] The insulating material chambers of the building elements are laterally delimited with webs or crossbars and have a closed plate as a rear wall at the rear. Building elements here and below are, in particular, wall, floor, ceiling, or roof elements. Such building elements can be prefabricated in a factory or produced directly on site and filled using mobile devices.

[0013] The device is not suitable for blowing in cellulose insulating materials. It is also conceivable that other materials, such as mineral fibres, sheep wool, wood fibre insulating material, glass wool, stone wool, wood shavings, etc., are blown in using the device. It is also conceivable for other loose materials, such as gravel or chalk grit, to be blown in.

[0014] The device can have means which facilitate a lifting and lowering of the cover element and simultaneously a pressing of the cover element onto the insulating material chamber. The device is, therefore, made simpler to operate for the operating personnel, and the blow-in pressure does not lift the cover element from the insulating material chamber. If the cover element’s own weight is heavy enough, a pressing device can be dispensed with. The cover element’s own weight is then sufficient to ensure that it is securely pressed onto the webs or crossbars of the insulating material chamber.

[0015] The filling nozzle can have a slide valve which closes the filling nozzle to prevent the plug of blow-in insulating material or parts thereof in the filling nozzle from falling out during the lifting of the cover element and, therefore, the lifting of the filling nozzle. Alternatively, the filling nozzle can also be provided with a tear-off collar. Such a tear-off collar can, for example, be designed in the form of a narrowing of the internal diameter of the filling nozzle -in particular, by an introduced ring or a flanging. Such a tear-off collar can be provided directly at the opening of the filling nozzle or set back to the extent of the insertion depth of the filling nozzle, if the filling nozzle is to be inserted into the insulating material chamber when blowing the blow-in insulating material in. Such a tear-off collar ensures that the plug remains above the tear-off collar in the filling nozzle, if the cover element and the filling nozzle are lifted, whilst the insulating material remains below the tear-off collar in the insulating material chamber. Undefined and/or inadequately filled areas in the insulating material chamber can, therefore, be effectively prevented. The remaining plug can be ejected again by the blow-in pressure created by renewed blowing in during the next filling process or, possibly, by a slight overpressure.

[0016] Moreover, the device can have a transporting device which receives a building element furnished with insulating material chambers to be filled. Such a transporting device allows a relative displacement between the cover element and insulating material chamber. This, therefore, facilitates a continuous or phased filling of an only partially covered insulating material chamber.

[0017] Furthermore, several insulating material chambers in the same building element can be filled easily in sequence. The transporting device can, on the one hand, displace the cover element or can be designed so that the building element is displaced.

[0018] It has been shown to be advantageous for the cover element to completely cover an insulating material chamber of a building element in at least one direction. The relative displacement between the cover element and the insulating material chamber is, therefore, then only required in the other di- rection. The relevant transporting device is simplified considerably as a result.

[0019] It is also conceivable for the cover element to completely cover at least one insulating material chamber. Therefore, a greater blow-in power can be used during filling, without the blow-in insulating material being able to escape laterally from the insulating material chamber. In so doing, it must be ensured that the contact pressure or the cover element’s own weight is selected accordingly, so that the cover element is not lifted. A considerable amount of time, and therefore costs, can be saved thereby, particularly when filling several large chambers.

[0020] The air-permeable membrane can have a padding layer. It goes without saying that such a padding layer is also, preferably, permeable to air. The fact that the air-permeable membrane has a padding layer means that the membrane can compensate for unevenness demonstrated by the webs or crossbars delimiting the insulating material chamber. The insulating material chamber is tightly sealed nevertheless.

[0021] The air-permeable membrane can have a thickness of 0.5 to 10 cm -in particular, 0.5 to 5 cm - preferably, 0.5 to 2 cm.

[0022] The surface of the air-permeable membrane that faces the insulating material chamber to be filled can have a layer which prevents conglobation of blow-in insulating material. Such a layer favours a uniform distribution of the blow-in insulating material in the insulating material chamber. Moreover, it is ensured that no blow-in insulating material is applied during the lifting or relowering of the cover element onto a web or a crossbar of the insulating material chamber.

[0023] Such a layer can contain fluorocarbons - in particular, PTFE. However, the use of other suitable materials is also conceivable. Alternatively or in addition, the device can comprise a cleaning unit which, when required or regularly, frees said cover element of adherent insulating material - for example, after each lifting of the cover element. Such a cleaning unit can, for example, have a suction nozzle which is placed on the membrane and moved over said membrane. It is also conceivable for the membrane to move over the suction nozzle. It has been shown that, preferably, each suction nozzle is arranged at the side of the device, and the membrane is moved over these suction nozzles.

[0024] The air-permeable membrane can be flexible and elastic. Flexible and elastic mean that the membrane as a whole is pliable, without it being damaged by flexing. Furthermore, its elasticity should permit unevenness to be evened out.

[0025] In so doing, only elastic deformation should occur when the air-permeable membrane is compressed. This ensures that the membrane returns to its original form after being compressed. This characteristic is particularly advantageous when tightly sealing the webs of the insulating material chamber. The membrane can also be compressed on the webs as a result, whilst the membrane maintains its original thickness in the space between the webs. This characteristic of the membrane ensures that an insulating material chamber cannot be overfilled, irrespective of the blow-in pressure, and the webs remain free of blow-in insulating material after the cover element has been removed.

[0026] The membrane can, for example, consist of a material which is known in the automotive industry as car headliner.

[0027] The air-permeable membrane can be supported by an equally air-permeable supporting body. This supporting body ensures that the air-permeable membrane is not lifted out of its plane, thereby resulting in the insulating material chamber being unevenly filled. Such a supporting body also ensures that insulating material chambers of different sizes can be tightly sealed.

[0028] If the air-permeable membrane is movable jointly with the filling nozzle in the plane of the membrane, a uniform filling - in particular, of large insulating material chambers - can be optimised. Furthermore, this makes it possible that a transporting device must only ensure a displacement in one direction between the cover element the and insulating material chamber. There fore, for example, several insulating material chambers which are separated from each other, and which are located in the working area of the device, can be filled one after another. Larger chambers can also be filled continuously or in phases by displacing the filling nozzle.

[0029] The supporting body can have a slot in which the filling nozzle is movable. The filling nozzle can additionally be attached to a separate guide. This guide is located as close as possible to the slot, so that there is no need to consider unnecessary tolerances. An excessive load on the interface between the filling nozzle and the membrane can be prevented, if the filling nozzle is moved synchronously with the membrane.

[0030] The air-permeable membrane can be a band which is mounted so as to be laterally movable - preferably, drivable - via at least two rollers. Such a band allows a displacement of the filling nozzle up to the edge of the device. In certain cases, it can be advantageous for the filling nozzles to be oriented in this way. The band can also be formed as an endless band.

[0031] As the membrane is a wear part, in an alternative embodiment, the membrane can be designed as a subsection of the band, or even as a separate part on the band. If the membrane is received only laterally by each band respectively, the material of the bands must not be air permeable. However, if the membrane is attached flatly to the band, it is advantageous if the band is also air permeable.

[0032] The air-permeable membrane can be attached releasably - for example, using Velcro fasteners. Other ways of attaching the membrane to the band are also conceivable. For example, a perforated rubber band or a textile strap can be used for the band. Other embodiments of the band are also conceivable.

[0033] The cover element can have, at least on its front side in the transporting direction, a closure means which, in the event of an incomplete covering of the insulating material chamber to be filled, projects into this chamber and closes off the interspace between the cover element and a rear wall of the insulating material chamber on one or several sides. Such a closure means is advantageous, particularly in the filling of large insulating material chambers. It allows the continuous filling of the insulating material chamber without the blown-in insulating material escaping on the front side of the cover element in the transporting direction. Such closure means can be designed in the form of a rubber-like lip, a plurality of rubber-like lugs, slats, an elastic body, an inflatable balloon, or a chain curtain made, for example, from a plurality of ball chains.

[0034] An embodiment according to the invention of a device which is advantageous on its own or in combination with one of the previously mentioned embodiments, contains a cover element to discharge the transport air required for the blowing in, as well as at least one filling nozzle. This at least one filling nozzle is used to introduce the blow-in insulating material into the insulating material chamber. The device also has sensor elements which measure the size and/or the shape of the insulating material chamber to be filled. Using such a sensor element, the position of the insulating material chamber to be filled can be determined simultaneously. The filling nozzle can, therefore, be positioned in a suitable position, e.g., approximately in the centre of the insulating material chamber, or can also be moved during filling. This makes uniform filling easier.

[0035] Optical sensor elements, infrared, ultrasound, high-frequency, or laser sensor elements can be used to measure the size and/or the shape of the insulating material chamber. Sensor elements based upon other technologies are also conceivable.

[0036] The size and/or the shape of the insulating material chambers to be filled can also be supplied by an appropriate CAD system or input directly in the form of a coordinate set.

[0037] The device can have computing means for evaluating the data supplied by the sensor elements and for determining the quantity of the blow-in insulating material required for filling. Alternatively, the quantity of blow-in insulating material required can also be determined from data provided by a CAD system or input directly in the form of a coordinate set. This allows an optimal quantity of blow-in insulating material to be blown in, based upon the size and/or shape of the insulating material chamber.

[0038] Alternatively, the device can have pressure sensors by means of which an optimal filling level can be determined. Such pressure sensors measure the pressure on the membrane which acts on the membrane from the blown-in insulating material. The pressure sensors can be mounted directly in or on the membrane. It is also conceivable that the pressure sensors be arranged between the membrane and the supporting body. Pressure sensors can also be arranged directly in the filling nozzle. This allows a conclusion to be drawn on the filling pressure and/or the feed pressure. Such pressure sensors can also be used to interrupt or completely stop the blowing in when specific pressure criteria are achieved. For example, pressure criteria can be defined which, when achieved, mean that the position of the filling can be shifted to a different position. Other criteria can define safety criteria so that damage to the insulating material chamber by excessive pressure can be prevented.

[0039] Furthermore, the data of the sensor elements or of the CAD system can also be used to optimally position the filling nozzles. Thus, for example, a fill line and the appropriate nozzle positions can be determined for each insulating material chamber. The fill line thereby determines the line on which the nozzle positions are arranged. Normally, the fill line is the midline of the insulating material chamber, but can deviate from this under given circumstances. The nozzle positions are those positions at which the filling nozzle is positioned to fill the insulating material chambers. The nozzle positions are determined based upon the dimensions of the insulating material chamber. In so doing, minimum wall clearances are observed for the first and last nozzle positions. It has been shown that an optimum wall clearance is between 20 and 70 cm - in particular, between 25 and 55 cm - particularly preferably, between 30 and 40 cm. The other nozzle positions are then arranged on the fill line - preferably, equidistant - with a clearance of between 35 and 100 cm -preferably, between 45 and 80 cm.

[0040] The sensor elements or the CAD system also determine the depth of the insulating material chambers to be filled. An optimum insertion depth for the filling nozzle can also be determined with the aid of these depth values. For example, data is stored in a table in the computing means for this purpose.

[0041] It is also conceivable for the sensors to be able to determine the type of surface of the elements delimiting the insulating material chamber, such as rear wall and lateral webs or crossbars. This data can be used to determine, depending upon the surface finish, a fill factor which is required for optimum filling of the insulating material chamber. The intended use of the building element as, for example, a wall, roof, or ceiling can also be considered to determine the fill factor. Appropriate values or correction factors can be stored in a table in the computing means. The fill factor is preferably set by a suitable setting of the air-material mixture, as well as by the feed pressure.

[0042] The device can have a load cell to check the correct filling quantity. Such a load cell can be arranged in the blow-in system or on the transporting device. In the first instance, the receipt of the weight of the insulating material in the blow-in system is measured, whilst in the second instance the weight increase of the building element provided with insulating material chambers is determined. The correct filling quantity is preferably determined with the aid of such a load cell and a pressure sensor, as described above. In particular, in each nozzle position, the device can be switched off when a defined pressure is reached. For the last nozzle position, the set point filling quantity can be drawn upon as a criterion, wherein the arrangement can also be switched off for safety reasons when a threshold pressure is reached.

[0043] The device can also have closing means so that, based upon the size and/or shape of the insulating material chamber to be filled, one or more filling nozzles can be closed. Such closing means make it possible for a filling nozzle which doesn’t come to rest in an insulating material chamber to be filled, to not be charged with blow-in insulating material. Furthermore, this enables a sequential filling of the insulating material chamber to be achieved. Typically, where there is a plurality of nozzles, one nozzle respectively is used for blowing in, whilst the other nozzles are inactive. However, it is also conceivable for a plurality of nozzles to be operated simultaneously. The closing means could be slide valves in the nozzle or active separators.

[0044] A method according to the invention for blowing blow-in insulating material - in particular, cellulose or other previously mentioned materials -into insulating material chambers of building elements using a blow-in device comprises the following steps: • providing an element having at least one insulating material chamber to be filled, • closing the insulating material chamber to be filled by means of a cover element provided with an air-permeable membrane, • blowing in blow-in insulating material through at least one filling nozzle, and • removing the air required for blowing in through the membrane.

[0045] The method can be carried out in accordance with one of the aforementioned embodiments.

[0046] When closing the insulating material chamber to be filled by means of the cover element, the cover element can be pressed onto the insulating material chamber - in particular, by its own weight - with the result that the membrane is compressed against webs which are covered by the cover element and which delimit the insulating material chamber. This compression ensures that no blow-in insulating material can escape laterally from the chamber.

[0047] The size and/or shape of the insulating material chamber to be filled can be determined by means of one or a plurality of sensor elements, before the blow-in insulating material is blown in. This data can, however, also be supplied by an external CAD system or input directly as a coordinate set. Appropriate computing means can, therefore, ensure that only the required quantity of blow-in insulating material is blown in. An under-filling or overfilling of the insulating material chamber is thereby prevented. Both an overfilling and an under-filling would weaken the thermal insulation. Furthermore, over-filling consumes unnecessary material.

[0048] If the blow-in device comprises pressure sensors which measure the pressure of the blown-in insulating material on the membrane, an under-filling and/or over-filling of the chambers can also be reliably prevented.

[0049] A chamber which is not to be filled can be detected by means of one or more sensor elements prior to blowing the blow-in insulating material in. Such a chamber must be marked accordingly beforehand. It is also conceivable that the sensor elements independently detect a chamber which is not to be filled, if said chamber is not provided with a rear wall. It is, therefore, possible that this chamber is not filled or that no blow-in insulating material is blown in. Such empty chambers are advantageous, for example, if an opening is required at this point by the customer, e.g., for household installations, windows, or doors.

[0050] The invention is described in more detail below with the aid of figures, which show only embodiment examples. The drawings show in

Figure 1 A perspective view of a device according to the invention, wherein a work table is only partially visible,

Figure 2 A cross section through the device according to Figure 1 along a plane through the filling nozzles,

Figure 3 A perspective view of a cover element in accordance with the device according to Figure 1,

Figure 4 A concept drawing of a cover element on a building element,

Figure 5 A perspective view of the device from Figure 1,

Figure 6a A schematic representation of a filling nozzle with a tear-off collar at the opening, and Figure 6b A schematic representation of a filling nozzle with a tear-off collar set back in the filling nozzle.

[0051] Figure 1 shows a perspective view of a device 1 according to the invention, wherein the work table 4 is only partially visible and a cover housing has been removed from the device. A building element 30 is placed on the work table 4. The building element 30 has a rear wall 33 on which a frame-like construction has been constructed using different webs 32. Insulating material chambers 31 are designed between the webs 32. The insulating material chambers 31 are to be filled with blow-in insulating material.

[0052] As well as the work table 4, the device 1 has a cover element 10 which is mounted on a lifting and lowering device 2 for lifting and lowering the device 1. The lifting and lowering device 2 is mounted on a transporting device 3 which permits the cover element 10 to be displaced in a horizontal direction.

[0053] The cover element 10 has a membrane 12 which is driven via four rollers 5 (see Figure 2) in the form of an endless band. The membrane 12 is shown transparently in Figure 1, to allow a view into the inside of the cover element 10. The membrane 12 is held in position on the underside of the cover element 10 by a supporting body 17. The supporting body 17 has a slot transverse to the direction of motion of the transporting device 3 in which two filling nozzles 20 can be moved back and forth. The filling nozzles 20 thereby move synchronously with the membrane 12 on the underside of the cover element 10.

[0054] As well as insulating material chambers 31, which are to be filled with the blow-in insulating material, the building element 30 also has chambers 37 which are not to be filled. Such a non-filled chamber 37 can, for example, receive elements for the house installation by the customer.

[0055] The device 1 also has sensor elements 6 which measure the size and/or shape of the insulating material chambers 31 to be filled prior to filling. These sensor elements 6 are mounted on a supporting frame which is fixed to the transporting device 3. The sensor elements 6 can thereby be moved over the building element. The sensor elements used are a laser scanner. Sensor elements based upon other technologies may also be used.

[0056] A control unit 8, which allows the device to be operated, can be identified on the side.

[0057] Figure 2 shows a cross section through the device 1 in accordance with Figure 1 along a plane through the filling nozzles 20. In turn, a building element 30, which comprises a rear wall 33 and webs 32, is arranged on the work table 4. The cover element 10 is shown above the work table 4 or the building element 30. The membrane 12, which spatially delimits the cover element 10 via the four rollers 5, can be clearly identified. The membrane 12 has a padding layer 13 on the underside of the cover element 10 (see Figure 4). Two filling nozzles 20 protrude out of the cover element 10 through openings 16 in the membrane. The filling nozzles 20 can be moved back and forth. In so doing, not only are the two filling nozzles 20 moved, but the membrane 12, which receives the two filling nozzles 20 in its openings 16, also moves synchronously with it. The membrane 15 is thereby driven via one of the four rollers 5. Flowever, it is also conceivable for several rollers 5 to be driven. Furthermore, the filling nozzles 20 can be individually lowered through the openings 16. This further improves the blowing in and uniform filling of the blow-in insulating material. One of the two filling nozzles 20 is shown in the lowered position.

[0058] To hold the membrane 12 in position during the blowing in, the cover element 10 has a supporting body 17 which supports the membrane 12. This supporting body 17 has a slot which allows the filling nozzles 20 to be movable laterally with the membrane 12.

[0059] The entire cover element 10 is attached to a lifting and lowering device 2 for lifting and lowering the device 1. This lifting and lowering device 2 consists of a chain drive. An embodiment having a threaded spindle or a lifting and lowering device designed like a lifting platform is also conceivable. The cover element 10 with its lifting and lowering device 2 is also mounted on a transporting device 3. This transporting device 3 allows the cover element 10 to be displaced in a direction perpendicular to the direction of movement of the filling nozzles 20. The transporting device 3 has a known roller and track system with a geared belt drive. Other types of transporting devices and/or drives are also conceivable.

[0060] Figure 3 shows a perspective view of a cover element 10 in accordance with the device according to Figure 1. The cover element 10 has four rollers 5 which span the membrane 12. The complete membrane 12 is designed as an endless band. On the underside of the cover element 10, a two-part supporting body 17 supports the membrane 12 against being displaced inwards. This supporting body 17 is formed by two perforated plates, which are also provided with cross struts to increase their stability. The two parts of the supporting body 17 are interconnected to form a plate. A gap 18 is designed between the two parts of the supporting body 17, which allows lateral displacement of the filling nozzles 20. A guide element on which the filling nozzles 20 are arranged displaceably is mounted next to the gap 18.

[0061] Sensor elements 6, which are mounted on a supporting frame and allow the insulating material chambers to be filled to be identified, are also visible. Furthermore, a cleaning element 25 is arranged laterally on both sides of the cover element 10, wherein, however, only one cleaning element 25 is visible. These cleaning elements 25 essentially comprise a swivel-mounted suction nozzle 26, which can be swivelled onto the membrane 12 when required, so that any adherent material - in particular, blow-in insulating material - can be removed. The suction nozzle 26 can, instead of a swivel movement, also be brought onto the membrane 12 by means of another movement. The suction nozzle 26 preferably has an elongated design, so that it can cover the entire width of the membrane 12.

[0062] A concept drawing in Figure 4 shows a subsection of a cover element 10 on a building element 30. The building element 30 has a rear wall 33 which is provided with webs 32. The cover element 10 is applied to webs 32. In so doing, a contact pressure is exerted on the membrane 12 via the supporting body 17 so that said membrane is pressed onto the webs 32. The membrane 12 is subsequently compressed in the area above the webs 32.

[0063] The membrane 12 comprises a support 19, a padding layer 13, and a sliding layer 15. The sliding layer 15 is designed such that no conglobations of blow-in insulating material can be formed on the surface 14. The membrane 12 has a thickness D of 1.5 cm. Other thicknesses are also conceivable. The membrane 12 is compressed in the area above the webs 32, and its thickness is reduced accordingly. The fact that the membrane 12 is designed to be flexible and elastic means that the compression acts only in the area of the webs 32. Directly next to the webs 32, the membrane 12 regains its original thickness D.

[0064] An interspace 35 is formed between the membrane 12 and the rear wall 33 of the building element. This interspace can be laterally delimited by the webs 32. A closed insulating material chamber 31 or a chamber 37 which is not to be filled is thereby formed. Normally, chambers 37 which are not to be filled do not have a rear wall, if they are to be recessed for windows, doors, or installations. However, it is also conceivable that chambers which do not have a rear wall are not to be filled. Such chambers can, for example, be temporarily equipped with a body - for example, a block of wood - for marking.

[0065] Figure 5 shows a perspective view of the rear side of the device 1 from Figure 1. A building element 30 is placed in turn on the work table 4, said building element being scanned by means of the sensor elements 6 prior to being filled with blow-in insulating material. The size and/or shape of the insulating material chambers 31 to be filled can, therefore, be measured using the sensor elements 6. The sensor elements 6 are fixed to the device 1 and cannot be lowered with the cover element 10.

[0066] Figures 6a and 6b show a schematic representation of a filling nozzle 20 with a different design. The filling nozzle 20 from Figure 6a thereby has a tear-off collar 23 in the form of a ring-shaped thickening at its opening 24. The filling nozzle 20 in accordance with Figure 6b is suitable for inserting into the insulating material chamber during filling and also has a tear-off collar 23. However, this tear-off collar 23 is set back in relation to the opening 24 and is formed from a flanging of the filling nozzle 20. The tear-off collar can be a welded-on ring, a flanging, or a necking. The collar can be designed continuously or in segments.

[0067] The internal diameter of the filling nozzle 20 is reduced in the area of the tear-off collar 23, so that a plug 22 forms in the filling nozzle 20 at the end of the filling process. When the cover element and, therefore, the filling nozzle 20 are lifted, the defined narrowing on the tear-off collar 23 now tears off the material of the blow-in insulating material at exactly this point. The plug 22 remains in the filling nozzle 20, and a clean filling is ensured.

[0068] When blowing into another insulating material chamber again, or into the same insulating material chamber at an additional nozzle position, the plug 22 is removed again from the filling nozzle 20 by a short burst of increased feed pressure - for example, for approx. 2 secs. The filling process can then be continued with the usual feed pressure.

Claims (22)

Device (1) for blowing blow-insulation material, especially cellulose, into insulating material chambers (31) of structural members (30) with a cover element (10) for at least partially covering an insulating material chamber (31) and at least one filling nozzle (20) for inserting the supply insulation material into the insulation material chamber (31), characterized in that the cover element (10) on the side which can be turned towards the insulation material chamber (31) to be filled is provided with a membrane (12) which is air permeable to its total surface, to allow the air to escape in a uniform manner, and that the at least one filling nozzle (20) is arranged in an opening (16) of the diaphragm (12). Device (1) according to claim 1, characterized in that the device (1) has means (2) which enable the cover element (10) to be lifted and lowered, and in particular to push the cover element (10) down onto the insulating material chamber (31). . Device (1) according to claim 1 or 2, characterized in that the device (1) has a transport device (3) for enabling relative movement between cover element (10) and insulating material chamber (31). Device (1) according to claim 3, characterized in that the covering element (10) completely covers at least one insulating material chamber (31) of a structural element (30) which is accommodated by the transport device (3) in at least one direction. Device (1) according to claim 3 or 4, characterized in that the cover element (10) completely covers at least one insulating material chamber (31) which is occupied by the transport device (3) in both directions. Device (1) according to one of claims 1 to 5, characterized in that the air-permeable membrane (12) is provided with a padding layer (13). Device (1) according to one of claims 1 to 6, characterized in that the air-permeable membrane (12) has a thickness (D) of 0.5-10 cm. Device (1) according to one of claims 1 to 7, characterized in that a surface (14) of the air-permeable membrane (12) facing the insulating material chamber (31) to be filled is provided with a layer (15). ) which prevents clumping of blow-insulation material. Device (1) according to claim 8, characterized in that the layer (15) contains fluorocarbons, especially PTFE. Device (1) according to one of claims 1 to 9, characterized in that the air-permeable membrane (12) is flexible and resilient. Device (1) according to one of claims 1 to 10, characterized in that the air-permeable membrane (12) is supported by an air-permeable support member (17). Device (1) according to one of claims 1 to 11, characterized in that the air-permeable membrane (12) together with the filling nozzle (20) can be moved in the plane of the membrane (12). Device (1) according to claims 11 and 12, characterized in that the support body (17) has a slot (18) in which the filling spout (20) can be moved. Device (1) according to claim 13, characterized in that the air-permeable membrane (12) is formed as a belt, in particular as an endless belt, which is mounted via at least two rollers (5) so that it can be moved laterally. preferably can be operated. Device (1) according to one of claims 1 to 14, characterized in that the cover element (10) has at least on its front side in the conveying direction a closing means (11) which, when not completely covered by the insulating material chamber (31) to be filled protrudes into the insulation material chamber (31) to be filled and closes the gap (35) between the cover element (10) and a back wall (33) of the insulation material chamber (31) to be filled. Device (1) according to one of claims 1 to 15, characterized in that the device (1) has sensor elements (6) which measure the size and / or shape of the insulating material chamber (31) to be filled. Device (1) according to claim 16, characterized in that the device (1) has computer means (7) for evaluating the sensor data and / or data supplied by a CAD system for determining the amount of the blow-insulation material, needed and / or for positioning the blow-in sockets (20). Device (1) according to claim 16 or 17, characterized in that the device (1) has closure means (21) so that, on the basis of the size and / or shape of the insulating material chamber (31) to be filled, several filling spouts (20). A method for blowing in blow insulation material, especially cellulose, into insulating material chambers (31) of structural members (30), in particular with a device (1) according to one of claims 1 to 18, comprising the steps of: - providing a structural member (30) with at least an insulating material chamber (31) to be filled; - closing the insulating material chamber (31) to be filled with a cover element (10) provided with an air-permeable membrane (12), the membrane (12) being air-permeable to its assembly. air, - blowing in air-insulating material through at least one filling nozzle (20), - discharging the air required for the blow-in through the diaphragm (12). Method according to claim 19, characterized in that, by closing the insulating material chamber (31) to be filled, the cover element (10) is pressed down on the insulating material chamber (31), in particular by its own weight, so that the membrane (12) ) is compressed against spacers (32) which are covered by the cover element (10) and which restrict the insulating material chamber (31). Method according to claim 19 or 20, characterized in that the size and / or shape of the insulating material chamber (31) to be filled is determined by one or more sensor elements (6) before the blow-in of the blow-insulating material. Method according to one of claims 19 to 21, characterized in that before the blow-in of blow-insulating material a chamber (37) which is not to be filled and correspondingly marked is detected by one or more sensor elements (31), and thus, no supply insulation material is blown into this chamber (37).