CN104542227B - A plant wall installation that can be used for aerosol cultivation - Google Patents

Abstract

The invention discloses a kind of plant walls device that can be used for aerial fog cultivation.This device includes plant load carrier, atomizer pipeline mechanism, nutritional solution loop control liquid case and closes plate four part；Plant load carrier and atomizer pipeline mechanism are installed in parallel on nutritional solution loop control liquid case, keep at a certain distance away between plant load carrier and atomizer pipeline mechanism, close plate and be arranged on the side of plant load carrier and atomizer pipe mechanism joint gap, to close the space between plant load carrier and atomizer pipe mechanism.The present invention solve existing with plant bag technology be the problem such as support the Nutrient cycle difficulty that plant walls exists, mobile inconvenience, plant change difficulty, body of wall load-bearing is big and consumptive material is serious, combine traditional plant wall and the advantage of two kinds of forms of aerial fog cultivation, view and admire for the exhibition of plant more easily and produce.

Description

A plant wall installation that can be used for aerosol cultivation

technical field

The invention relates to a plant wall device, in particular to a plant wall device which can be used for aerosol cultivation, can be assembled in units, and can be used as aerosol cultivation and plant wall structure.

Background technique

In recent years, in order to better develop the growth potential of plants and reduce the pollution and waste of land resources, scholars have proposed cultivation modes such as matrix cultivation, hydroponics, and aerosol cultivation. Among these three main new cultivation modes, Aerosol cultivation has been widely researched and actively promoted because it can fully develop the growth potential of plant roots, thereby effectively stimulating plant growth potential, shortening plant growth period, and requiring less environmental conditions for space growth.

With the improvement of people's requirements for the quality of life, greening in homes, shops or public places is becoming more and more popular, but the main form of greening is potted plants (mostly soil cultivation, a small amount of hydroponics), which requires a lot of manpower to maintain nutrients and water. Supply, and because the potted plants are not easy to set freely in height, the greening effect is not good. At present, there are plant walls with better greening effects on the market, which are supported by plant bag technology, but due to technical limitations, there are problems such as difficult nutrient circulation, inconvenient movement, difficult plant replacement, heavy wall load and serious consumables.

Contents of the invention

In order to solve the problems existing in the background technology, the object of the present invention is to provide a plant wall device that can be used for aerosol cultivation, which solves the difficulties in nutrient circulation, inconvenient movement, difficult plant replacement, and heavy wall bearing existing in existing plant walls. It combines the advantages of traditional plant wall and aerosol cultivation, and is used for better and faster plant exhibition viewing and production.

The technical scheme adopted in the present invention is:

The invention comprises a plant carrying mechanism, an atomizing nozzle pipeline mechanism, a nutrient solution circulation control liquid tank and a closing plate; the plant carrying mechanism and the atomizing nozzle pipeline mechanism are installed in parallel on the nutrient solution circulation control liquid tank, and the plant carrying mechanism and the atomizing nozzle There is a certain distance between the pipeline mechanisms, and the closing plate is installed on the side of the connection gap between the plant carrying mechanism and the atomizing nozzle pipeline mechanism to close the gap between the plant carrying mechanism and the atomizing nozzle pipeline mechanism.

The nutrient solution circulation control liquid tank includes a front liquid pool, a rear liquid tank, a side tank, a pH adjustment solution liquid tank and a nutrient solution liquid tank; the rectangular box body top surface of the nutrient solution circulation control liquid tank is provided with two parallel Rectangular groove, the groove on the front side is the front liquid tank, and the groove on the rear side is equipped with a cover plate, which is the rear liquid tank; the front and rear sides of the front liquid pool are respectively opened for installing the plant bearing mechanism, atomization The strip-shaped groove of the nozzle pipe mechanism is along the long side of the front liquid pool; the side box is installed on the side of the rectangular box of the nutrient solution circulation control liquid tank, and the side box is located on the side of the front liquid pool and the rear liquid tank. A pH adjusting solution tank and a nutrient solution tank are installed on the cover plate of the liquid tank, and the pH adjusting solution tank and the nutrient solution tank communicate with the rear liquid tank through a pipeline passing through the rear liquid tank cover plate.

The plant carrying mechanism is assembled by a plurality of plant carrying units with the same structure in a tight array, and the atomizing nozzle pipeline mechanism is assembled in a dense array of a plurality of atomizing nozzle pipeline units with the same structure.

The plant bearing unit includes a rectangular frame and a plant planting plate; the rectangular planting plate is installed in the rectangular frame, and an assembly mechanism is provided on the periphery of the rectangular frame, and plant planting holes for inserting plant roots are opened on the planting plate. The hole spacing array is evenly distributed on the planting board; the front of the planting board where each row of planting holes is located is equipped with strip-shaped plant arc brackets. The section of the plant arc brackets is arc-shaped and bent upwards, and the plant arc The bottom of the bracket is connected to the bottom of the corresponding row of planting holes.

The atomizing nozzle pipeline unit includes a rectangular support plate, a hook, a square pipeline structure and an atomizing nozzle; an assembly structure is arranged on the periphery of the rectangular support plate, and a square pipeline structure is fixedly installed on the inner surface of the rectangular support plate close to the plant bearing mechanism ; The square pipe structure includes multiple horizontal pipes and two vertical pipes, the two vertical pipes are located on both sides respectively, and there are multiple horizontal pipes connected between the two vertical pipes; the four corners of the square pipe structure lead to useful The pipeline interface connected between the square pipeline structures of adjacent atomizing nozzle pipeline units; each horizontal pipeline is evenly connected with atomizing nozzles facing the plant supporting mechanism at intervals.

The assembly mechanism on the peripheral edge of the rectangular frame and the assembly structure on the peripheral edge of the rectangular support plate adopt the same assembly structure, including an assembly groove structure and an assembly convex structure: the assembly convex structure includes a rectangular convex strip and a convex strip assembly hole, Rectangular convex strips are arranged on any two sides of the rectangular frame or rectangular supporting plate that are perpendicular to each other; the assembly groove structure includes a rectangular groove and a groove assembly hole, and the other two sides opposite to the two sides are provided with rectangular Rectangular grooves fitted with convex strips; convex strip assembly holes are evenly distributed on the rectangular convex strips, and groove assembly holes corresponding to the convex strip assembly holes are evenly distributed on the rectangular grooves; rectangular convex strips of a rectangular frame Insert into the rectangular groove of the adjacent rectangular frame, insert the rectangular protruding strip of a rectangular supporting plate into the rectangular groove of the adjacent rectangular supporting plate, and fasten with bolts and nuts after the groove assembly hole and the protruding strip assembly hole are correspondingly aligned.

The PH solution tank is filled with an acidic or alkaline solution for regulating plant growth, and the nutrient solution tank is filled with a high-concentration nutrient solution for cultivating plants.

The plant planting holes are evenly distributed on the planting board in a square arrangement at intervals.

The square pipe structure is fixed on the rectangular support plate by a hook.

The beneficial effects of the present invention are:

The present invention improves the traditional plant wall structure by using aerosol cultivation, not only has the advantages of aerosol cultivation, but also can be assembled in a unitary manner, which improves the difficulty of nutrient circulation, inconvenient movement, and difficulty in plant replacement in traditional plant walls to a certain extent. There are problems such as heavy wall bearing and serious consumables.

Description of drawings

Figure 1 is a perspective isometric front view of the present invention.

Figure 2 is a perspective isometric rear view of the present invention.

Fig. 3 is a perspective view of the back of the plant bearing unit of the present invention.

Fig. 4 is a schematic structural view of the front of the plant bearing unit of the present invention.

Fig. 5 is a perspective view of the front of the pipe unit of the atomizing nozzle of the present invention.

Fig. 6 is a schematic structural view of the nutrient solution tank of the present invention.

Fig. 7 is a partially enlarged view of the nutrient solution tank of the present invention.

Fig. 8 is a schematic diagram of planting and cultivation of the present invention.

In the figure: 1. Plant bearing mechanism, 10. Plant bearing unit, 11. Assembly groove structure, 111. Groove assembly hole, 112. Rectangular groove, 12. Assembly convex structure, 121. Rectangular convex strip, 122. Raised bar assembly hole, 13. Rectangular frame, 14. Plant planting plate, 15. Plant planting hole, 16. Plant arc bracket, 17. Plant; 2. Atomizing nozzle pipeline mechanism, 20. Atomizing nozzle pipeline unit, 21. Hook, 22. Square pipe structure, 23. Atomizing nozzle, 24. Rectangular support plate; 3. Nutrient solution circulation control liquid tank, 31. Front liquid pool, 32. Rear liquid tank, 33. Nutrient liquid liquid tank, 34. pH adjustment solution tank, 35. side box, 36. perforation, 37. dividing plate; 4. closing plate.

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings and specific examples, but not as a limitation of the present invention.

As shown in Fig. 1 and Fig. 2, the present invention comprises four parts: a plant supporting mechanism 1, an atomizing nozzle pipeline mechanism 2, a nutrient solution circulation control liquid tank 3 and a closing plate 4. The plant carrying mechanism 1 and the atomizing nozzle pipeline mechanism 2 are installed in parallel on the nutrient solution circulation control liquid tank 3, and there is a certain distance between the plant carrying mechanism 1 and the atomizing nozzle pipeline mechanism 2. In this specific implementation, the plant carrying mechanism 1 and The distance between the pipe mechanisms 2 of the atomizing nozzles is 20 cm. The closing plate 4 is installed on the upper side of the rectangular gap formed by the connection between the plant supporting mechanism 1 and the atomizing nozzle pipeline mechanism 2, the left side and the right side, so as to close the gap between the plant supporting mechanism 1 and the atomizing nozzle pipeline mechanism 2 void.

As shown in Figure 8, the plant carrying mechanism 1 holds plants 17 for cultivation, ornamental or fresh-keeping, and the stems, leaves and flowers of the plants 17 are placed in the plant arc-shaped bracket 16 and the plant arc-shaped support in the plant carrying mechanism 1. The outside of the groove 16 is used for viewing and viewing, and the root system is placed in the gap formed by the plant carrying mechanism 1 and the atomizing nozzle pipeline mechanism 2, and accepts the spray from the atomizing nozzle pipeline mechanism 2.

As shown in Figure 6, the nutrient solution circulation control liquid tank 3 comprises front liquid pool 31, rear liquid tank 32, side case 35, adjusts pH solution liquid tank 34 and nutrient solution liquid tank 33; Two parallel rectangular grooves are arranged on the top surface of the casing, the groove positioned at the front side is the front liquid pool 31, and the groove positioned at the rear side is provided with a cover plate, which is the rear liquid tank 32; The rear side is respectively provided with a strip groove for installing the plant supporting mechanism 1 and the atomizing nozzle pipeline mechanism 2. The strip groove is along the long side direction of the front liquid pool 31. In the strip grooves of the front and rear sides of the liquid pool 31.

The above-mentioned pH solution tank 34 is equipped with an acidic or alkaline solution for adjusting the pH of the nutrient solution, and the nutrient solution tank 33 is equipped with a high-concentration nutrient solution for exchanging the nutrient solution.

As shown in FIG. 6 , a side box 35 is installed on the side of the rectangular box body of the nutrient solution circulation control liquid tank 3 , and the side box 35 is positioned at the sides of the front liquid pool 31 and the rear liquid tank 32 . Adjusting pH solution liquid tank 34 and nutrient solution liquid tank 33 are installed on the cover plate of rear liquid tank 32, and adjusting pH solution liquid tank 34 and nutrient liquid liquid tank 33 pass through the pipeline of rear liquid tank 32 cover plates and rear liquid tank 32 connected.

The front liquid pool 31 is used to receive the nutrient solution after spraying the root system, that is, the nutrient solution waste liquid. After this part of the waste liquid is collected to a certain extent, it will be transferred to the rear liquid tank 32 through the control device of the side box 35 for concentration adjustment, and the synthetic Fresh nutrient solution was used for aeroponic cultivation of plants. Adjust PH solution liquid tank 34 and nutrient solution liquid tank 33 and place side by side above rear liquid tank 32, be convenient to the control device in side case 35 to carry out nutrient composition and pH adjustment to the nutrient solution in rear liquid tank 32, add water Supplement to mix into fresh nutrient solution to supply plants. Side box 35 can be used to place parts such as controller, sensor, filter, water pump.

As shown in FIG. 7 , a number of circular perforations 36 are provided on the side wall of the side box 35 for components such as sensors to enter the rear liquid tank 32 and the front liquid pool 31 to realize the detection and circulation control of the nutrient solution. A partition 37 is arranged in the side box 35 to achieve the purpose of layering the controller and the water pump.

As shown in Fig. 1 and Fig. 2, the plant supporting mechanism 1 is assembled by a plurality of plant supporting units 10 with the same structure in a tight array, and the atomizing nozzle pipeline mechanism 2 is tightly assembled by a plurality of atomizing nozzle pipeline units 20 with the same structure. The array is assembled, and the atomizing sprinkler pipe unit 20 is arranged in the same array as the plant bearing unit 10 and corresponds to it. The form of assembly is not limited to the 3×3 form shown in FIG. 1 and FIG. 2 .

As shown in Figure 3, the plant carrying unit 10 comprises a rectangular frame 13 and a plant planting plate 14; the rectangular planting plate 14 is installed in the rectangular frame 13, and the edges around the rectangular frame 13 are provided with an assembly mechanism, and the planting plate 14 is provided with holes for inserting Plant planting holes 15 for adorning plant roots, and the plant planting holes 15 are evenly distributed on the planting plate 14 in interval arrays, not limited to the circular plant planting holes 15 in the present example are evenly distributed on the planting plate 14 in a square arrangement. The planting hole 15 is a circular through hole with a diameter of about two centimeters. Wrapping the plant root system with a sponge and inserting it in the plant planting hole 15 can play the role of fixing the plant root system.

As shown in Figure 4, the front of the planting plate 14 where the plant planting holes 15 of each row are located is equipped with strip-shaped plant arc brackets 16, the section of the plant arc brackets 16 is arc-shaped and bent upwards, and the plant arc-shaped The bottom of the bracket 16 is connected to the bottom of the corresponding row of plant planting holes 15. Cut for easy plant fixation.

As shown in FIG. 5 , the atomizing nozzle pipe unit 20 includes a rectangular support plate 24 , a hook 21 , a square pipe structure 22 and an atomizing nozzle 23 . Rectangular support plate 24 is the same size as the rectangular frame 13 of plant carrying unit 10, and the edge of rectangular support plate 24 is provided with assembly structure, and rectangular support plate 24 is fixedly installed with square pipe structure 22 near the inner surface of plant carrying mechanism 1, square The pipeline structure 22 includes a plurality of horizontal pipelines and two vertical pipelines, the two vertically arranged pipelines are respectively located on both sides, and there are many horizontal pipelines connected between the two vertical pipelines, the form is not limited to the four in this example The number of horizontal water pipes can be adjusted by adding two vertical pipes to the horizontal pipe.

The four corners of the square pipe structure 22 all lead to the pipe interface used for the connection between the square pipe structures 22 of the adjacent atomizing nozzle pipe unit 20, that is, the connection between the vertical pipes and the horizontal pipes at the four corners of the square pipe structure 22 are connected The pipeline interface used, the pipeline interface on the four corners of the square pipeline structure 22 can be a small section of pipeline, about 2 cm away from the edge of the rectangular support plate 24, after the pipeline unit 20 of the atomizing nozzle is assembled in any shape, it can be integrated with the pipeline connector and the pipeline The network pipes are connected to achieve a balanced supply of nutrient solution to each atomizing nozzle.

Each horizontal pipe in the square pipe structure 22 is evenly spaced and connected with atomizing nozzles 23 facing the plant supporting mechanism 1 . The atomizing nozzles 23 are installed on the pipeline, and are evenly arranged in a square on the part of the support plate corresponding to the planting area, so that the sprayed mist droplets can be evenly sprayed on the root system, but the number is not limited to this embodiment 20, can be adjusted according to the actual situation.

The square pipe structure 22 can be fixed on the rectangular support plate 24 through the hook 21, and the rectangular support plate 24 is installed with multiple rows of hooks 21 at intervals, and the horizontal pipes of the square pipe structure 22 are hung on the hook 21. The number of hooks is not limited to 24 in this embodiment, and is specifically set according to specific conditions such as the bearing capacity of the hook 21 and the weight of the pipeline.

As shown in Fig. 3 and Fig. 5, the assembly mechanism of the peripheral edge of the rectangular frame 13 and the assembly structure of the peripheral edge of the rectangular support plate 24 adopt the same assembly structure, including the assembly groove structure 11 and the assembly convex structure 12: assembly convex structure 12 includes a rectangular raised strip 121 and a raised strip assembly hole 122, and a rectangular raised strip 121 is provided on any side of the rectangular frame 13 or a rectangular support plate 24 perpendicular to each other; the assembly groove structure 11 includes a rectangular groove 112 and a groove Assembling holes 111, the other two sides opposite to the two sides are provided with rectangular grooves 112 cooperating with the rectangular convex strips 121; The groove assembly holes 111 corresponding to the convex strip assembly holes 122 are evenly distributed at intervals; the rectangular convex strips 121 of a rectangular frame 13 are inserted into the rectangular grooves 112 of the adjacent rectangular frame 13, and the rectangular convex strips of a rectangular support plate 24 121 is inserted into the rectangular groove 112 of the adjacent rectangular support plate 24, and after the groove assembly hole 111 is aligned with the protruding strip assembly hole 122, fasten them with bolts and nuts.

The specific implementation process of the present invention is as follows: the front liquid pool 31 is used to receive the nutrient solution after spraying the root system, that is, the nutrient solution waste liquid. After this part of the waste liquid is collected to a certain extent, it will be transferred to the rear liquid by the control device of the side box 35. Case 32, adjust PH solution liquid tank 34 and nutrient solution liquid tank 33 and place side by side above rear liquid tank 32, be convenient to carry out nutritional labeling and pH adjustment to the nutrient solution in rear liquid tank 32, add the replenishment of water, blend into fresh nutrient solution. The control device in the side box 35 transports the nutrient solution mixed in the rear liquid tank 32 to each atomizing nozzle 23 in the atomizing nozzle pipeline mechanism 2 and sprays it to the plant carrying mechanism 1 and the atomizing nozzle pipeline mechanism 2. In the relative gap formed. The plant carrying mechanism 1 holds plants 17 for cultivation, viewing or preservation. The stems, leaves and flowers of the plants 17 are placed outside the plant carrying mechanism 1 for viewing, while the roots are placed in the plant carrying mechanism 1 and the atomizing nozzle. In the gap formed by the pipeline mechanism 2, the spray from the pipeline mechanism 2 of the atomizing nozzle is received. The nutrient solution after spraying the root system falls into the front liquid pool 31, thereby realizing the combination of the aerosol cultivation mode and the plant wall cultivation mode,

It can be seen from the above-mentioned embodiments that the present invention realizes the combination of the aerosol cultivation mode and the plant wall cultivation mode. Due to the flexible assembly, it can be applied to different purposes in different occasions, such as vegetable and flower exhibitions in public exhibition halls, vegetables in restaurants and flower shops. , flower preservation, household ornamental planting, etc.

In addition, the present invention can also have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding All changes and deformations should fall within the protection scope of the appended claims of the present invention.

Claims (8)

1. A plant wall device that can be used for aerosol cultivation, characterized in that it includes a plant carrying mechanism (1), an atomizing nozzle pipeline mechanism (2), a nutrient solution circulation control liquid tank (3) and a closed plate (4) The plant supporting mechanism (1) and the atomizing nozzle pipeline mechanism (2) are installed in parallel on the nutrient solution circulation control liquid tank (3), and there is a certain distance between the plant supporting mechanism (1) and the atomizing nozzle pipeline mechanism (2) , the closing plate (4) is installed on the side of the connection gap between the plant supporting mechanism (1) and the atomizing nozzle pipeline mechanism (2), so as to close the gap between the plant supporting mechanism (1) and the atomizing nozzle pipeline mechanism (2); The nutrient solution circulation control tank (3) includes a front tank (31), a rear tank (32), a side tank (35), a pH adjustment solution tank (34) and a nutrient solution tank (33); The top surface of the rectangular box body of the nutrient solution circulation control liquid tank (3) is provided with two parallel rectangular grooves, the groove on the front side is the front liquid pool (31), and the groove on the rear side is provided with a cover plate. It is the rear liquid tank (32); the front and rear sides of the front liquid pool (31) are respectively provided with strip-shaped grooves for installing the plant bearing mechanism (1) and the atomizing nozzle pipeline mechanism (2). The direction of the long side of the pool (31); side boxes (35) are installed on the side of the rectangular box of the nutrient solution circulation control liquid tank (3), and the side boxes (35) are located at the front liquid pool (31) and the rear liquid tank (32) The side of the rear liquid tank (32) is equipped with a pH adjustment solution tank (34) and a nutrient solution tank (33), and the pH adjustment solution tank (34) and the nutrient solution tank (33) pass through the The pipeline of the rear liquid tank (32) cover plate communicates with the rear liquid tank (32) afterwards. 2. A plant wall device that can be used for aerosol cultivation according to claim 1, characterized in that: the plant carrying mechanism (1) is assembled by a plurality of plant carrying units (10) with the same structure in a tight array The said atomizing nozzle pipeline mechanism (2) is formed by a plurality of atomizing nozzle pipeline units (20) closely arrayed and assembled with the same structure. 3. A plant wall device that can be used for aerosol cultivation according to claim 2, characterized in that: the plant carrying unit (10) includes a rectangular frame (13) and a plant planting board (14); The planting plate (14) is installed in the rectangular frame (13), and the edges of the rectangular frame (13) are provided with an assembly mechanism, and the planting plate (14) is provided with a plant planting hole (15) for inserting the plant root system, and the plant planting hole (15) The spaced arrays are evenly distributed on the planting board (14); the front of the planting board (14) where each row of planting holes (15) is located is equipped with strip-shaped plant arc brackets (16), and the plant arc brackets The section of the slot (16) is arc-shaped and bent upward, and the bottom of the arc-shaped plant bracket (16) is connected to the bottom of the corresponding row of plant planting holes (15). 4. A plant wall device that can be used for aerosol cultivation according to claim 2, characterized in that: said atomizing nozzle pipeline unit (20) includes a rectangular support plate (24), a hook (21), a square The pipe structure (22) and the atomizing nozzle (23); the rectangular support plate (24) is provided with an assembly structure around the edge, and the rectangular support plate (24) is fixedly installed with a square pipe structure ( 22); the square pipe structure (22) includes multiple horizontal pipes and two vertical pipes, the two vertically arranged pipes are respectively located on both sides, and there are multiple horizontal pipes connected between the two vertical pipes; the square pipe structure The four corners of (22) all lead to the pipe interface used for the connection between the square pipe structure (22) of the adjacent atomizing nozzle pipe unit (20); each horizontal pipe is evenly distributed and connected to the plant bearing mechanism (1) The atomizing nozzle (23). 5. A plant wall device that can be used for aerosol cultivation according to claim 3, characterized in that: the assembly mechanism of the surrounding edges of the rectangular frame (13) and the assembly structure of the surrounding edges of the rectangular support plate (24) The same assembly structure is adopted, including the assembly groove structure (11) and the assembly convex structure (12): the assembly convex structure (12) includes a rectangular convex strip (121) and a convex strip assembly hole (122), in the rectangular frame ( 13) or rectangular support plates (24) are provided with rectangular convex strips (121) on any two sides perpendicular to each other; the assembly groove structure (11) includes rectangular grooves (112) and groove assembly holes (111), the The other two sides opposite to each other are provided with rectangular grooves (112) cooperating with the rectangular convex strips (121); the rectangular convex strips (121) are evenly distributed with convex strip assembly holes (122), the rectangular concave The slots (112) are evenly distributed with groove assembly holes (111) corresponding to the convex strip assembly holes (122); the rectangular convex strips (121) of a rectangular frame (13) are inserted into the adjacent rectangular frame (13) In the rectangular groove (112), the rectangular protrusion (121) of a rectangular support plate (24) is inserted into the rectangular groove (112) of the adjacent rectangular support plate (24), and the groove assembly hole (111) and the protrusion Fasten with bolts and nuts after the bar assembly holes (122) are correspondingly aligned. 6. A plant wall device that can be used for aerosol cultivation according to claim 1, characterized in that: said pH solution tank (34) is equipped with acidic or alkaline solution for regulating plant growth, nutrient solution The liquid tank (33) is equipped with high-concentration nutrient solution for cultivating plants. 7. A plant wall device that can be used for aerosol cultivation according to claim 3, characterized in that: the plant planting holes (15) are evenly distributed on the planting board (14) in a square arrangement at intervals . 8 . The plant wall device applicable to aerosol cultivation according to claim 4 , characterized in that: the square pipe structure ( 22 ) is fixed on the rectangular support plate ( 24 ) by a hook ( 21 ).