CN114310815A - Overturning and transferring device for spacecraft structural slab - Google Patents

Abstract

The invention provides a spacecraft structural plate overturning and transferring device, which comprises: the base platform is used for bearing and has a width and/or height adjusting function; the fixing frame is arranged on the base platform and used for installing the processed structural plate, the fixing frame can be adjusted to a target length and can be adjusted to at least one target of a target width, a target height and a target orientation under the driving of the base platform, wherein the target length and the target width are matched with the processed structural plate.

Description

Overturning and transferring device for spacecraft structural slab

Technical Field

The invention relates to the technical field of spacecraft manufacturing, in particular to a spacecraft structural plate overturning and transferring device.

Background

For meeting the design requirement of light weight, the main structure of the spacecraft is mostly made of light-weight aluminum honeycomb plates. On the one hand, the main size distribution range of the spacecraft structural part is as follows: the surface size is 500mm 3500mm, the thickness is 30 mm 50mm, and the surface cleaning agent has the characteristics of large size, various shapes (mostly rectangular or polygonal), easy damage caused by collision and the like. On the other hand, the spacecraft structural panel is used as a main body structure of a spacecraft, various components such as load mounting holes/mounting seats, cables, heating plates, OSR and the like are widely distributed on the spacecraft structural panel, in order to meet the thermal control requirement of a spacecraft system, the surface of a structural component is generally subjected to surface painting treatment, and the whole production and manufacturing process of the spacecraft structural panel needs multiple processes. Based on the above characteristics, the manufacturing process of the structural plate usually needs to carry out long-distance transfer and turnover double-sided operation.

In traditional manufacturing process, the transport of structural slab, the manual work mode is adopted mostly to the upset mode, and this type of operation mode is consuming time and wasting force, the operation is very convenient and fast, and has great operation potential safety hazard, very easily leads to the work piece to take place to collide with or fall the phenomenon because of misoperation, leads to the product impaired, even scrap.

In view of the above technical difficulties, a new device is urgently needed to be developed to solve the problems of insufficient safety, inconvenient operation and the like of the large-size structural plate of the spacecraft in the processes of overturning and transferring.

Patent document CN204036120U discloses an adjustable aerospace thin-wall plate turnover mechanism, which includes a base, a turnover arm, a fixed arm and a power source, the opposite sides of the turnover arm and the fixed arm are contact surfaces of plates to be turned over, the bottom end of the turnover arm is hinged to the frame on the upper surface of the base, the included angle between the fixed arm and the upper surface of the base is smaller than 90 degrees, and the bottom end of the fixed arm is welded and fixed on the frame on the upper surface of the base, the gap with the width equal to the thickness of the plates to be turned over is exposed on the bottom end of the turnover arm and the upper surface of the base between the bottom ends of the fixed arm, the power source for providing turnover force is arranged on the opposite sides of the turnover arm and the fixed arm, but the design cannot adjust the height of a workpiece, and the universality is poor.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a spacecraft structural plate overturning and transferring device.

The invention provides a spacecraft structural plate overturning and transferring device, which comprises:

the base platform is used for bearing and has a width and/or height adjusting function;

a fixed frame mounted on the base platform and used for mounting a processed structural plate, wherein the fixed frame can be adjusted to a target length and can be adjusted to at least one target of a target width, a target height and a target orientation under the driving of the base platform, and the target length and the target width are matched with the processed structural plate.

Preferably, the base platform realizes width adjustment by matching a sliding pair with a horizontal power mechanism, and the horizontal power mechanism is driven by a motor or hydraulically.

Preferably, the base platform can adjust its height to the target height in a continuous height adjustment manner or a discrete height adjustment manner through two electric lifting columns of the base platform to match the machining height required by the machined structural slab.

Preferably, the electric lifting upright post adopts a three-section structure and has a power-off self-locking function.

Preferably, the base platform can drive the fixed frame to rotate around an axis through a corner servo control box, so that the fixed frame is corrected to the target orientation, wherein the corner servo control box has any one or more of the following structures:

a control key;

a display;

a locking member.

Preferably, the base platform has two base structure frames arranged symmetrically and the electric lifting columns are detachably mounted on the base structure frames.

Preferably, the base platform has two modes, a movable mode in which the base platform can be pushed in a rolling manner and a non-movable mode in which the base platform cannot be pushed.

Preferably, the fixed frame comprises a longitudinal guide rod, a telescopic reinforcing beam, an indexing positioning adapter and a sliding beam assembly;

the two longitudinal guide rods are arranged in parallel, two ends of the telescopic reinforcing beam and two ends of the sliding beam assembly are respectively installed on the two longitudinal guide rods and are both arranged perpendicular to the longitudinal guide rods, and two ends of the telescopic reinforcing beam are respectively connected with the two longitudinal guide rods through the indexing positioning adaptor;

and the two longitudinal guide rods and the telescopic reinforcing beam are of telescopic structures.

Preferably, the indexing positioning adaptor comprises a rotating shaft, an indexing disc and a frame connecting piece;

the index plate is sleeved on the rotating shaft, one end of the rotating shaft is installed on the base platform, one side of the frame connecting piece is installed at the other end of the rotating shaft, the other side of the frame connecting piece is provided with a first installation structure and a second installation structure respectively, and the first installation structure and the second installation structure are used for installing the longitudinal guide rod and the telescopic reinforcing beam respectively.

Preferably, the processed structural plate is mounted on the fixing frame in the form of a snap-fit buckle by a structural plate connector.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention can realize the functions of overturning, transferring and fixing the fixed angle of the large-size structural plate of the spacecraft, and solves the problems of insufficient safety, inconvenient operation and the like of the large-size structural plate in the overturning and transferring processes.

2. The invention can flexibly adjust the width and the height of the base platform and the geometric dimension of the fixed frame, thereby meeting the fixing requirements of the processed structural plates with different dimensions, having good universality, reducing the occupied space and improving the installation convenience of the structural plates.

3. The invention can realize the accurate corner control and the fixed-angle hovering fixation of the structural slab so as to adapt to the requirements of different working scenes.

4. The invention adopts a modular design, is convenient to manufacture and convenient to maintain, has the functions of overturning, transferring and fixing the structural plate, can realize single clamping and fixing of the whole process flow and the universal function of multiple processes, reduces the repeated clamping and fixing of the structural plate in multiple processes, and greatly improves the production efficiency.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of a fixing frame according to the present invention;

FIG. 3 is a schematic structural view of an indexing positioning adaptor according to the present invention;

FIG. 4 is a schematic structural view of a glide beam assembly of the present invention;

FIG. 5 is a schematic view of a base platform according to the present invention;

FIG. 6 is a schematic view of the construction of the base structure frame of the present invention;

fig. 7 is a schematic structural diagram of a rotation angle servo control mechanism according to the present invention.

The figures show that:

fixed frame 1servo motor 2142

Longitudinal guide rod 11worm gear reducer 2143

Telescopic stiffening beam 12coupling 2144

Hollow stiffeningbeam 121pivot cover 2145

Rotatingshaft supporting seat 2146 of theadapting rod 122

Linear motor 123spring indexing pin 2147

Indexingpositioning adaptor 13mounting plate 2148

Rotating shaft 131synchronous belt wheel 2149

Indexing disc 132synchronous belt 21410

Frame connector 133mounting bolt 21411

First coupling groove 1331 andsecond coupling groove 1332

Electric lifting column 22 of slidingbeam assembly 14

Slip joint 141 lead screwheel brace 23

Beamguide 142universal wheel 24

Slidingbeam 143base structure frame 25

Connectingbolt 144stringer 251

Hand bolt 145side pull rod 252

Base platform 2adapter plate 253

Reinforcingbeam 254 of cornerservo control box 21

Hollow beam 255 ofcontrol button 211

Display 212horizontal telescoping motor 26

Linear guide 27 ofbox 213

Cornerservo control mechanism 214 structuralplate connecting piece 3

Base 2141 machined structural plate 4

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.

Example 1:

the invention provides a spacecraft structural slab overturning and transferring device which comprises a fixedframe 1 and abase platform 2, wherein thebase platform 2 is used for bearing and has a width and/or height adjusting function; the fixedframe 1 is mounted on abase platform 2 and is used for mounting a processed structural plate 4, wherein the processed structural plate 4 is preferably mounted on the fixedframe 1 in the form of a snap-fit by means of astructural plate connection 3. The fixedframe 1 can be adjusted to a target length and can be adjusted to at least one of a target width, a target height, a target orientation under the urging of thebase platform 2, wherein the target length and the target width match the processed structural panel.

Thebase platform 2 can adjust the width by matching a sliding pair with a horizontal power mechanism, so as to obtain the target width, wherein the horizontal power mechanism can be driven by a motor or hydraulically, and in some specific application scenes, the horizontal power mechanism can also be driven by an air cylinder, so that the horizontal power mechanism can meet the requirement of processing the structural plate 4 with a specific size.

Thebase platform 2 can adjust its height to a target height in a continuous height adjustment manner or a discrete height adjustment manner through twoelectric lifting columns 22, wherein theelectric lifting columns 22 preferably have a three-section structure and have a power-off self-locking function.

Further, thebase platform 2 has two base structure frames 25 arranged symmetrically, and theelectric lifting columns 22 are detachably mounted on the base structure frames 25.

Thebase platform 2 can drive the fixedframe 1 to rotate around the axis through the angularservo control box 21, so that the fixedframe 1 is corrected to the target orientation, wherein the angularservo control box 21 has any one or more of the following structures:

the control key can be operated manually, and parameter setting or specific action execution can be realized by manually operating the control key;

adisplay 212 displaying a target width, target length, and/or target orientation;

the locking piece adopts an automatic locking structure or a manual locking structure to meet the requirements of actual products.

Thebase platform 2 of the present invention has two modes, a movable mode and an immovable mode, in the movable mode, thebase platform 2 can be pushed in a rolling manner, for example, theuniversal wheels 24 are arranged below thebase structure frame 25, in the immovable mode, thebase platform 2 cannot be pushed, for example, thebase structure frame 25 is provided with the leadscrew foot support 23, the roller cannot land by operating the leadscrew foot support 23, the supporting state of thebase structure frame 25 is realized, and at this time, the base platform cannot be moved.

Specifically, the fixedframe 1 includes alongitudinal guide rod 11, aretractable reinforcement beam 12, anindexing positioning adapter 13 and a slidingbeam assembly 14, the twolongitudinal guide rods 11 are arranged in parallel, two ends of theretractable reinforcement beam 12 and two ends of the slidingbeam assembly 14 are respectively installed on the twolongitudinal guide rods 11 and are both arranged perpendicular to thelongitudinal guide rods 11, two ends of theretractable reinforcement beam 12 are respectively connected with the twolongitudinal guide rods 11 through theindexing positioning adapter 13, and the twolongitudinal guide rods 11 and theretractable reinforcement beam 12 are both retractable structures.

Further, theindexing positioning adaptor 13 includes arotating shaft 131, anindexing disc 132 and aframe connecting member 133, theindexing disc 132 is sleeved on therotating shaft 131, one end of therotating shaft 131 is installed on thebase platform 2, one side of theframe connecting member 133 is installed at the other end of therotating shaft 131, the other side of theframe connecting member 133 is respectively provided with a first installation structure and a second installation structure, and the first installation structure and the second installation structure are respectively used for installing thelongitudinal guide rod 11 and the retractable reinforcingbeam 12.

It should be noted that the target width, the target height, the target length, and the target orientation in the present invention are defined for the processed structural plate 4, the fixingframe 1 needs to be adjusted to different target widths and target lengths for the processed structural plates 4 with different sizes to match the installation of the processed structural plate 4, the target height of the fixingframe 1 needs to be adjusted to facilitate the installation of the processed structural plate 4 or facilitate the processing operation of the processed structural plate 4 when the processed structural plate 4 is installed or the processed structural plate 4 is processed, during the processing of the processed structural plate 4, the orientation of the processed structural plate 4, i.e. the target orientation, needs to be continuously adjusted for the processing requirement, and when the target orientation is adjusted, the fixingframe 1 is locked by the locking piece to facilitate the further processing operation.

Example 2:

this embodiment is a preferred embodiment ofembodiment 1.

The embodiment provides a spacecraft structural slab overturning and transferring device, which comprises a fixedframe 1, abase platform 2 and a structuralslab connecting piece 3, wherein the fixedframe 1 is installed on thebase platform 2, a processed structural slab 4 is connected with the structuralslab connecting piece 3 through bolts through mounting holes on the side surface or the upper surface and the lower surface, and the structuralslab connecting piece 3 is connected with the fixedframe 1 through a quick-pressing buckle.

As shown in fig. 2, the fixedframe 1 includes alongitudinal guide 11, aretractable reinforcement beam 12, anindexing positioning adaptor 13, and a slidingbeam assembly 14. Thelongitudinal guide rod 11 is provided with a channel which is installed in a paired mirror image manner, theindexing positioning adaptor 12 is screwed in the middle of thelongitudinal guide rod 11 in a paired mirror image manner, and the slidingbeam assembly 14 penetrates into thelongitudinal guide rod 11 from two ends of thelongitudinal guide rod 11 respectively to form a sliding pair with thelongitudinal guide rod 11; the retractable reinforcingbeam 12 is in threaded connection with the reinforcing beam interface of theindexing positioning adapter 13. By adjusting the relative positions of the two slidingbeam assemblies 14 and the transverse expansion amount of the telescopic reinforcingbeam 12, the geometric dimension of the fixedframe 1 can be flexibly adjusted, so that the fixing requirements of the processed structural plates 4 with different dimensions are met, and the space is saved.

As shown in fig. 3, theindexing positioning adaptor 13 includes arotating shaft 131, anindexing disc 132, and aframe connector 133, and all the parts are connected by welding; therotating shaft 131 is a stepped shaft, and the end part is provided with a key groove; theindexing plate 132 is provided with waist-shaped holes which are arranged in an equidistant circular array, the center of theindexing plate 132 is provided with a round hole, and therotating shaft 131 is provided with a round hole which is welded with theindexing plate 132; theframe connecting member 133 has a T-shaped structure, a first connectinggroove 1331 matched with thelongitudinal guide bar 11 is formed at the upper end, a second connectinggroove 1332 matched with the retractable reinforcingbeam 13 is formed at the lower end, the first connectinggroove 1331 is a first mounting structure, the second connectinggroove 1332 is a second mounting structure, and a kidney-shaped through hole is formed in the end surface of each groove.

As shown in fig. 4, the slidingbeam assembly 14 includes a sliding joint 141, abeam guide 142, a slidingbeam 143, a connectingbolt 144, ahand bolt 145; thebeam guide rods 142 are of a hollow structure, and thebeam guide rods 142 are installed at two ends of the slidingbeam 143 in pairs and form a sliding pair with the slidingbeam 143; the sliding joint 141 is provided with a rectangular guide hole, and the center of the side wall of the guide hole is provided with a threaded hole; thelongitudinal guide rod 11 passes through the rectangular guide hole of the sliding joint 141 to form a sliding pair with the sliding joint 141; the sliding joint 141 is connected with thebeam guide rod 142 through a connectingbolt 144; the hand-screwedbolt 145 and the threaded hole in the center of the side wall of the guide hole form a thread pair, so that the slidingbeam assembly 14 is limited and fixed, wherein the slidingbeam 142 is made of 4040W heavy aluminum profiles with grooves.

As shown in fig. 2, the retractable reinforcingbeam 12 includes a hollow reinforcingbeam 121, anadapter rod 122, and alinear motor 123, theadapter rod 122 penetrates through the inside of the hollow reinforcingbeam 121, is screwed with the hollow reinforcingbeam 121 at one end, and forms a sliding pair with the hollow reinforcingbeam 121 at the other end, the bottom of thelinear motor 123 is installed in theadapter rod 122, the bottom is connected with theadapter rod 122, and the movable end extends out of theadapter rod 122 to be connected with the hollow reinforcingbeam 121.

As shown in fig. 5 and 6, thebase platform 2 includes a cornerservo control box 21, anelectric lifting column 22, alead screw support 23, auniversal wheel 24, abase structure frame 25, a horizontaltelescopic motor 26, and alinear guide rod 27; thebase structure frame 25 is installed in a pair of mirror images, the lower end of thebase structure frame 25 is provided with a screwrod foot support 23 and auniversal wheel 24, alinear guide rod 27 penetrates through the oppositehollow cross beam 255, and thehollow cross beam 255 and theguide rod 27 form a sliding pair. The linearpush rod motor 26 is arranged between the two stiffeningbeams 254 of thebase structure frame 25, the two ends of the linearpush rod motor 26 are connected with the two stiffeningbeams 254 through bolts, and the width of thebase platform 2 can be flexibly adjusted by controlling the telescopic stroke of the linearpush rod motor 26 so as to save space and meet the installation requirements of the machined structural plates 4 with different sizes.

Theelectric lifting columns 22 are installed in pairs in thebase structure frame 25, and the same controller is adopted, so that the synchronism of the electric lifting columns on the two sides is ensured. By controlling the stroke of the electric liftingupright post 22, the overall height of the fixedframe 1 can be flexibly adjusted to obtain the target height, so that the processed structural plate 4 can be conveniently installed at the bottom position, and the requirement of the turning space of the large-size processed structural plate 4 can be met at the high position. The upper end surface of the electric liftingupright post 22 is provided with a cornerservo control box 21.

As shown in fig. 6, thebase structure frame 25 includeslongitudinal beams 251, side pullrods 252, anadapter plate 253, a reinforcingbeam 254, and across beam 255, and the components are connected by welding, and mounting holes are formed in the beams and theadapter plate 253 according to the mounting positions of theelectric lifting column 22, the horizontaltelescopic motor 26, thescrew rod support 23, and theuniversal wheel 24 in thebase platform 2.

In this embodiment, theelectric lifting column 22 is a three-section electric lifting column, the stroke is greater than or equal to 500mm, the single motor bears more than or equal to 500kg, and theelectric lifting column 22 has a power-off self-locking function.

As shown in fig. 5, 6 and 7, the cornerservo control box 21 includes acontrol button 211, adisplay 212, abox 213 and a cornerservo control mechanism 214; thedisplay 212 and thecontrol buttons 211 are arranged on the outer wall of thebox body 213; the rotational angleservo control mechanism 214 is installed inside thehousing 213.

The angularservo control mechanism 214 includes abase 2141, aservo motor 2142, aworm gear reducer 2143, acoupling 2144, ashaft cover 2145, ashaft support 2146, aspring indexing pin 2147, a mountingplate 2148, asynchronous pulley 2149, asynchronous belt 21410, and a mountingbolt 21411. The precise rotation angle control and the fixed-angle hovering fixation of the processed structural slab 4 can be realized by controlling the rotation angle of theservo motor 2142 so as to adapt to the requirements of different working scenes

The mountingplate 2148 is vertically welded to the upper surface of thebase 2141, and mounting holes are formed according to the mounting holes of theservo motor 2142 and theworm gear reducer 2143.

Theservomotor 2142, theworm gear reducer 2143 and the mountingplate 2148 are connected bybolts 21411.

Thesynchronous belt pulley 2149 penetrates through theservomotor shaft 2142 and the input shaft of theworm gear reducer 2143, and is connected to each shaft through a flat key.

Thesynchronous belt 21410 is selectively matched according to the diameter, the distance and the specification of the belt pulleys 2149, and is connected to the belt pulleys 2149 at both ends respectively.

The rotatingshaft supporting seat 2146 is screwed on the upper surface of thebase 2141, the rotatingshaft supporting seat 2146 is provided with a U-shaped hole, and the rotating shafts of theindexing positioning adaptor 13 at the two ends of the fixedframe 1 are respectively arranged in the U-shaped hole of the supportingseat 2146 to establish a revolute pair with the rotatingshaft supporting seat 2146; the U-shaped holes are symmetrically provided with spring indexing pins 2147.

The mounting position of thespring indexing pin 2147 corresponds to the hole position of theindexing disc 132, the end of thespring indexing pin 2147 releasing pin passes through the waist-shaped hole of theindexing disc 132, and thespring indexing pin 2147 serves as a locking piece and can play a role in positioning and locking the fixedframe 1.

The rotary shaft of theindexing positioning adapter 13 is connected with the output shaft of theworm gear reducer 2143 through acoupler 2144, and the rotaryshaft cover plate 2145 is provided with a mounting hole and is connected with the upper end face of the rotaryshaft support seat 2146 through a bolt, so that therotary shaft 131 is prevented from jumping out.

In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims (10)

1. The utility model provides a spacecraft structural slab upset transfer device which characterized in that includes:

a base platform (2) for carrying and having a width and/or height adjustment function;

a fixed frame (1) mounted on the base platform (2) and used for mounting a processed structural plate (4), the fixed frame (1) can be adjusted to a target length and can be adjusted to at least one target of a target width, a target height and a target orientation under the driving of the base platform (2), wherein the target length and the target width match the processed structural plate.

2. The spacecraft structural plate overturning and transferring device according to claim 1, wherein the base platform (2) is adjusted in width by matching a sliding pair with a horizontal power mechanism, and the horizontal power mechanism is driven by a motor or hydraulically.

3. The spacecraft structural panel turnover transfer device of claim 1, wherein the base platform (2) can adjust its height to the target height by means of two electric lifting columns (22) to match the required processing height of the processed structural panel (4).

4. The spacecraft structural panel turnover transfer device of claim 3, wherein the electric lifting columns (22) are of a three-section structure and have a power-off self-locking function.

5. The spacecraft structural panel overturning and transferring device according to claim 1, wherein the base platform (2) can drive the fixed frame (1) to rotate around the axis through the angular servo control box (21) so as to modify the fixed frame (1) to the target orientation, wherein the angular servo control box (21) has any one or more of the following structures:

a control key;

a display (212);

a locking member.

6. Spacecraft structural panel turnover transfer device according to claim 3, characterised in that said base platform (2) has two base structural frames (25) in a symmetrical arrangement and said motorized lifting columns (22) are mounted in a removable manner on said base structural frames (25).

7. A spacecraft structural panel turnover transfer device according to claim 1, wherein the base platform (2) has both a movable mode in which the base platform (2) can be pushed in a rolling manner and an immovable mode in which the base platform (2) cannot be pushed.

8. The spacecraft structural panel turnover transfer device of claim 1, wherein the fixed frame (1) comprises a longitudinal guide bar (11), a retractable reinforcement beam (12), an indexing positioning adaptor (13) and a glide beam assembly (14);

the two longitudinal guide rods (11) are arranged in parallel, two ends of the telescopic reinforcing beam (12) and two ends of the sliding beam assembly (14) are respectively installed on the two longitudinal guide rods (11) and are both arranged perpendicular to the longitudinal guide rods (11), and two ends of the telescopic reinforcing beam (12) are respectively connected with the two longitudinal guide rods (11) through the indexing positioning adaptor (13);

wherein, the two longitudinal guide rods (11) and the telescopic reinforcing beam (12) are of telescopic structures.

9. The spacecraft structure plate turning transfer device of claim 8, wherein the indexing positioning adaptor (13) comprises a rotating shaft (131), an indexing disc (132) and a frame connector (133);

the dividing plate (132) is sleeved on the rotating shaft (131), one end of the rotating shaft (131) is installed on the base platform (2), one side of the frame connecting piece (133) is installed at the other end of the rotating shaft (131), the other side of the frame connecting piece (133) is provided with a first installation structure and a second installation structure respectively, and the first installation structure and the second installation structure are used for installing the longitudinal guide rod (11) and the telescopic reinforcing beam (12) respectively.

10. A spacecraft structural panel turnover transfer device according to claim 1, characterised in that said processed structural panel (4) is mounted on said fixed frame (1) in the form of a snap-fit through structural panel connections (3).

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