Organic liquid fertilizer production equipment

Abstract

This invention provides an organic liquid fertilizer production device, relating to the field of organic liquid fertilizer production technology. The device includes an aeration mechanism with a feed cover at its upper end for the organic liquid fertilizer material to enter and undergo aeration and fermentation; a separation mechanism located at the lower end of the aeration mechanism, where the organic liquid fertilizer material enters for solid-liquid separation; a reaction mechanism where the organic liquid fertilizer material enters for humic acid reaction; a main rotating shaft running through the aeration, separation, and reaction mechanisms at their midpoints; and a touch control module located on the side of the reaction mechanism. The aeration, separation, and reaction mechanisms are integrated into one unit, driven by a single main rotating shaft with centralized touch control. This eliminates additional conveying components, reduces floor space and energy consumption, prevents material leakage, simplifies operation, promotes continuous operation, optimizes reaction effects, significantly improves production efficiency and product quality, and enhances practicality.

Description

Technical Field

[0001] This invention relates to the field of organic liquid fertilizer production technology, specifically to an organic liquid fertilizer production equipment. Background Technology

[0002] Organic liquid fertilizer production equipment is a core device in modern agricultural production used to convert organic raw materials into directly applicable liquid fertilizer. Its core functions encompass key processes such as raw material aeration and composting, solid-liquid separation, and humic acid chelation reaction. It is widely used in various fields including farmland planting, protected horticulture, and ecological agriculture. The performance of this type of equipment directly determines the composting effect, nutrient utilization rate, and production efficiency of the organic liquid fertilizer. It is a crucial support for realizing the resource utilization of organic waste and promoting green and sustainable agricultural development. Its structural design and operational stability have a significant impact on the scale and standardization of agricultural production.

[0003] Currently, in existing organic liquid fertilizer production processes, aeration, solid-liquid separation, and humic acid reaction are typically completed using multiple independent devices. These devices are connected by pipelines for material transport, and each device has its own independent drive and control components and pumps. Patent CN102557803A discloses a process and related equipment for producing high-efficiency organic liquid fertilizer using biogas slurry. This patent also employs a split-type equipment layout, with each key process corresponding to independent equipment, requiring additional conveying structures for material transfer between devices. In these existing technologies, the multi-device, split layout results in a large overall footprint and high investment costs. Furthermore, the need for additional pumps for material transport between processes increases energy consumption and increases the risk of material leakage, impacting the production environment. Simultaneously, the independent control components of each device prevent centralized, coordinated control, leading to cumbersome operating procedures, poor production continuity, and an inability to meet the demands of large-scale, high-efficiency organic liquid fertilizer production. This problem has become a core bottleneck restricting the widespread application of existing organic liquid fertilizer production equipment. Summary of the Invention

[0004] Technical problems to be solved To address the shortcomings of existing technologies, this invention provides an organic liquid fertilizer production equipment that solves the problems of existing technologies that use a split layout, with each process of aeration, solid-liquid separation, and humic acid reaction requiring independent equipment, necessitating additional conveying structures to transfer materials between each piece of equipment, resulting in large floor space, high energy consumption, independent control of each piece of equipment, cumbersome operation, poor production continuity, and difficulty in meeting the needs of large-scale and efficient production.

[0005] Technical solution To achieve the above objectives, the present invention provides the following technical solution: an organic liquid fertilizer production device, comprising: The aeration mechanism has a feed cover at the top for the organic liquid fertilizer material to enter and complete the aeration and fermentation. The separation mechanism is located at the lower end of the aeration mechanism, and organic liquid fertilizer material enters its interior for solid-liquid separation. The reaction mechanism allows organic liquid fertilizer materials to undergo a humic acid reaction inside. The main rotating shaft is located in the middle of the interior of the aeration mechanism, separation mechanism, and reaction mechanism; The touch module is located on the side of the reaction mechanism.

[0006] Preferably, the upper end of the main rotating shaft rotates through the lifting platform, and a reduction motor is fixed on the upper end of the lifting platform, with the output end of the reduction motor fixedly connected to the main rotating shaft; Two electric push rods are symmetrically fixed at the lower end of the lifting platform. The lower end of the electric push rods is supported on the upper end of the aeration mechanism, and the electric push rods and the reduction motor are electrically connected to the touch control module.

[0007] Preferably, an air pump is fixed to the upper end of one side of the aeration mechanism, and a purification tank is fixed to the upper end of the other side. The input end of the purification tank is connected to the air outlet of the aeration mechanism. A blocking block is fixed on the main rotating shaft at the middle opening at the lower end of the aeration mechanism. The blocking block is adapted to the lower opening of the aeration mechanism, and the air pump is electrically connected to the touch control module.

[0008] Preferably, the aeration mechanism includes an aeration tank and a first stirring frame. The first stirring frame is fixedly sleeved on the main rotating shaft and located inside the aeration tank. A folding stirring plate is hinged to the lower end of the first stirring frame. An aeration plate is embedded in the bottom of the aeration tank. The aeration plate is connected to the output end of the air pump through a pipe.

[0009] Preferably, the separation mechanism includes a filter tank, a second stirring frame, and an auxiliary frame. A filter screen is provided through the bottom of the filter tank. The second stirring frame is vertically slidably mounted on the main rotating shaft and is circumferentially fixed to the main rotating shaft by a positioning pin. The second stirring frame is located inside the filter tank, and its width gradually decreases from the center to the outside. A waste door is hinged to the side of the filter tank near the bottom opening.

[0010] Preferably, the auxiliary frame is fixedly sleeved on the main rotating shaft and located at the lower end of the filter screen. Both ends of the auxiliary frame are vertically slidably provided with lifting columns. A spring is connected between the lower end of the lifting column and the lower end face of the auxiliary frame. An auxiliary roller is rotatably provided between the two lifting columns, and the auxiliary roller abuts against the lower end face of the filter screen.

[0011] Preferably, the reaction mechanism includes a mixing tank and a third stirring frame. A liquid outlet valve is provided at the discharge port at the lower end of the mixing tank. A dosing tank is fixed on the side of the mixing tank. A drug storage tank and a metering pump are provided inside the dosing tank. The output end of the metering pump is connected to the inside of the mixing tank and is electrically connected to the touch control module. The third stirring frame is fixedly sleeved on the lower end of the main rotating shaft and is located inside the mixing tank.

[0012] Preferably, a support frame is fixedly provided at the lower end of the reaction mechanism, and a reinforcing rib is fixedly provided inside the support frame.

[0013] Beneficial effects This invention provides an organic liquid fertilizer production device. It has the following beneficial effects: 1. This invention provides an organic liquid fertilizer production equipment, which integrates the aeration mechanism, separation mechanism and reaction mechanism into one unit, adopts a single main rotating shaft to run through each mechanism and is controlled by a centralized touch control module, optimizes the overall structural layout of the equipment, reduces the equipment floor space, reduces equipment investment costs, and eliminates the need for additional conveying pumps between each process, reducing the risk of leakage during material conveying and optimizing the production environment.

[0014] 2. This invention provides an organic liquid fertilizer production equipment. Through the electrical connection between the touch module and each execution component, centralized collaborative control is achieved, simplifying the operation process, promoting the continuous and efficient operation of each process, and improving production efficiency. At the same time, through the cooperation of each stirring mechanism and auxiliary component, the aeration, solid-liquid separation and humic acid reaction effects are optimized, significantly improving the product quality of organic liquid fertilizer and enhancing the practicality and promotion value of the equipment. Attached Figure Description

[0015] Figure 1 This is an isometric view of the present invention; Figure 2 This is a side view of the separation mechanism of the present invention; Figure 3 This is an isometric view of the aeration tank of the present invention; Figure 4 This is a side view of the separation mechanism of the present invention; Figure 5 This is a bottom-view axial side schematic diagram of the separation mechanism of the present invention; Figure 6 This is a schematic diagram of the reaction mechanism of the present invention from an axonal perspective; Figure 7 This is a side view of the main rotating shaft and related structures of the present invention.

[0016] The components include: 1. Aeration mechanism; 2. Separation mechanism; 3. Support frame; 4. Touch control module; 5. Reinforcing rib; 6. Reaction mechanism; 7. Air pump; 8. Feed cover; 9. Main shaft; 10. Gear motor; 11. Lifting platform; 12. Electric push rod; 13. Blocking block; 14. Purification tank; 101. Aeration tank; 102. First stirring frame; 103. Aeration plate; 104. Folding stirring plate; 201. Filter tank; 202. Waste door; 203. Second stirring frame; 204. Filter screen; 205. Auxiliary frame; 206. Lifting column; 207. Spring; 208. Auxiliary roller; 601. Mixing tank; 602. Third stirring frame; 603. Liquid outlet valve; 604. Dosing tank. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] like Figure 1-7 As shown, this embodiment of the invention provides an organic liquid fertilizer production device, including an aeration mechanism 1 with a feed cover 8 at its upper end for the organic liquid fertilizer material to enter and complete aeration and fermentation; a separation mechanism 2 located at the lower end of the aeration mechanism 1, through which the organic liquid fertilizer material enters for solid-liquid separation; a reaction mechanism 6, through which the organic liquid fertilizer material enters for humic acid reaction; a main rotating shaft 9, which is located in the middle of the aeration mechanism 1, the separation mechanism 2, and the reaction mechanism 6; and a touch control module 4 located on the side of the reaction mechanism 6. Specifically, in the above specific embodiments, the feed cover 8 and the upper end of the aeration mechanism 1 are detachably connected, which facilitates the disassembly, cleaning and maintenance of the feed cover 8. At the same time, it can realize the rapid feeding of materials, avoid material spillage during the feeding process, and ensure the smoothness of the feeding process. After the feeding is completed, closing the feed cover 8 can make the aeration mechanism 1 form a relatively closed space, optimize the aeration and fermentation effect, and prevent the spread of odor and material splashing during the aeration process.

[0019] It should be noted that a sealing gasket is provided at the connection between the feed cover 8 and the aeration mechanism 1 to further improve the airtightness, ensure the stability of the aeration and fermentation process, and avoid affecting the aeration efficiency due to poor sealing.

[0020] The upper end of the main rotating shaft 9 rotates through the lifting platform 11. A reduction motor 10 is fixed at the upper end of the lifting platform 11. The output end of the reduction motor 10 is fixedly connected to the main rotating shaft 9. Two electric push rods 12 are symmetrically fixed at the lower end of the lifting platform 11. The lower end of the electric push rods 12 is supported on the upper end of the aeration mechanism 1. Both the electric push rods 12 and the reduction motor 10 are electrically connected to the touch module 4. Specifically, in the above-described embodiment, a bearing is provided between the main rotating shaft 9 and the lifting platform 11 to reduce the frictional resistance when the main rotating shaft 9 rotates, ensuring the smoothness of the main rotating shaft 9's rotation, reducing component wear, and extending the equipment's service life. The geared motor 10 provides power for the rotation of the entire equipment. Through its fixed connection with the main rotating shaft 9, it drives the main rotating shaft 9 to rotate stably, thereby driving the operation of each stirring mechanism. The electric push rod 12, through its telescopic movement, drives the lifting platform 11 and the geared motor 10 to rise and fall synchronously, thereby driving the main rotating shaft 9 and the blockage block 13 on the shaft to rise and fall, realizing the opening and closing of the lower opening of the aeration mechanism 1, ensuring the conveying of materials. The touch control module 4, through its electrical connection with the electric push rod 12 and the geared motor 10, achieves precise control of their operating status. The telescopic stroke of the electric push rod 12 and the speed of the geared motor 10 can be set according to production needs.

[0021] An air pump 7 is fixed to the upper end of one side of the aeration mechanism 1, and a purification tank 14 is fixed to the upper end of the other side. The input end of the purification tank 14 is connected to the air outlet of the aeration mechanism 1. A blocking block 13 is fixed on the main rotating shaft 9 at the middle opening at the lower end of the aeration mechanism 1. The blocking block 13 is adapted to the lower opening of the aeration mechanism 1. The air pump 7 is electrically connected to the touch module 4. The aeration mechanism 1 includes an aeration tank 101 and a first stirring frame 102. The first stirring frame 102 is fixedly sleeved on the main rotating shaft 9 and located inside the aeration tank 101. A folding stirring plate 104 is hinged to the lower end of the first stirring frame 102. An aeration plate 103 is embedded in the bottom of the aeration tank 101. The aeration plate 103 is connected to the output end of the air pump 7 through a pipe. Specifically, in the above-described embodiment, after the air pump 7 is started, it supplies air to the aeration plate 103. The aeration plate 103 disperses the air into tiny bubbles, which are then evenly introduced into the material in the aeration tank 101, providing sufficient oxygen for the aeration and fermentation of the material and promoting the decomposition of organic matter in the material. The first stirring frame 102 rotates with the main shaft 9, driving the folding stirring plate 104 to rotate synchronously, stirring the material, promoting full contact between the material and the bubbles, and optimizing the aeration and fermentation effect.

[0022] It is worth noting that the folding mixing plate 104 is connected by a hinge, which allows it to adaptively adjust its angle according to the shape of the bottom of the aeration tank 101 when the main shaft 9 drives the first mixing frame 102 to rise and fall. This prevents the folding mixing plate 104 from colliding and wearing with the bottom of the aeration tank 101, while ensuring no dead corners during mixing and improving the uniformity of mixing. The purification tank 14 is used to treat the waste gas generated during aeration, adsorbing odors and harmful components in the waste gas, preventing direct emission of waste gas and improving the environmental friendliness of the equipment. The material blocking block 13 is adapted to the lower opening of the aeration mechanism 1, enabling precise sealing and opening of the opening, ensuring that the material is in a closed space during aeration and fermentation, and allowing the material to fall quickly and smoothly during transport.

[0023] The separation mechanism 2 includes a filter tank 201, a second stirring frame 203, and an auxiliary frame 205. A filter screen 204 is installed through the bottom of the filter tank 201. The second stirring frame 203 is vertically slidably sleeved on the main rotating shaft 9 and is circumferentially fixed to the main rotating shaft 9 by a positioning pin. The second stirring frame 203 is located inside the filter tank 201, and its width gradually decreases from the center to the outside. A waste door 202 is hinged to the side of the filter tank 201 near the bottom opening. The auxiliary frame 205 is fixedly sleeved on the main rotating shaft 9 and is located at the lower end of the filter screen 204. Lifting columns 206 are vertically slidably installed through both ends of the auxiliary frame 205. A spring 207 is connected between the lower end of the lifting column 206 and the lower end face of the auxiliary frame 205. An auxiliary roller 208 is rotatably installed between the two lifting columns 206. The auxiliary roller 208 abuts against the lower end face of the filter screen 204. Specifically, in the above-described embodiment, the filter tank 201 is used to receive the fermented material discharged from the aeration mechanism 1. The second stirring frame 203 rotates with the main rotating shaft 9 to stir the material. Since the width of the second stirring frame 203 gradually decreases from the center to the outside, centrifugal force can be generated during the stirring process, promoting the accumulation of solid impurities on the inner wall of the filter tank 201, while accelerating the speed at which the material passes through the filter screen 204, thus optimizing the solid-liquid separation efficiency. The positioning pin ensures that the second stirring frame 203 rotates synchronously with the main rotating shaft 9, while allowing the second stirring frame 203 to slide vertically along the main rotating shaft 9, adapting to the lifting and lowering movement of the main rotating shaft 9, and avoiding interference between components. The filter screen 204 is used to intercept solid impurities in the material, achieving solid-liquid separation. The auxiliary frame 205 rotates with the main shaft 9, driving the auxiliary roller 208 to rotate synchronously. Under the elastic force of the spring 207, the auxiliary roller 208 always abuts against the lower end face of the filter screen 204, rolling and squeezing the filter screen 204 to promptly remove solid impurities attached to it, preventing clogging and ensuring the continuity of solid-liquid separation. The waste door 202 is hinged, facilitating periodic opening and cleaning of accumulated solid impurities in the filter tank 201, reducing equipment maintenance difficulty. It should be noted that the spring 207 has a certain amount of elastic extension and contraction, which can adapt to slight deformation of the filter screen 204, ensuring that the auxiliary roller 208 and the filter screen 204 always maintain a good contact state, while avoiding excessive pressure that could damage the filter screen 204.

[0024] The reaction mechanism 6 includes a mixing tank 601 and a third stirring frame 602. A liquid outlet valve 603 is provided at the discharge port at the lower end of the mixing tank 601. A dosing tank 604 is fixed on the side of the mixing tank 601. A drug storage tank and a metering pump are provided inside the dosing tank 604. The output end of the metering pump is connected to the inside of the mixing tank 601, and the metering pump is electrically connected to the touch module 4. The third stirring frame 602 is fixedly sleeved on the lower end of the main rotating shaft 9 and located inside the mixing tank 601. A support frame 3 is fixedly provided at the lower end of the reaction mechanism 6, and a reinforcing rib 5 is fixedly provided inside the support frame 3. Specifically, in the above-described embodiment, the mixing tank 601 is used to receive the filtrate discharged from the separation mechanism 2, the chemical storage tank in the dosing tank 604 is used to store the reagents required for the humic acid reaction, and the metering pump is used to accurately inject the reagents into the mixing tank 601 according to the set amount, ensuring the accuracy of the reaction ratio, thereby optimizing the humic acid reaction effect and improving the product quality of the organic liquid fertilizer. The third stirring frame 602 rotates with the main shaft 9 to fully stir the filtrate and reagents in the mixing tank 601, promoting uniform mixing and ensuring a thorough humic acid reaction. The discharge valve 603 is used to control the discharge of the finished organic liquid fertilizer, and the discharge speed and discharge amount can be flexibly controlled according to production needs. The support frame 3 is used to support the entire equipment, improving the stability of the equipment operation. The reinforcing ribs 5 can enhance the structural strength of the support frame 3, prevent the support frame 3 from deforming due to long-term bearing of the equipment weight, and extend the overall service life of the equipment. It should be noted that the metering pump is electrically connected to the touch module 4. The dosage of the metering pump can be accurately set through the touch module 4, so as to realize the automation and precision of drug addition, reduce human operation error, and reduce the intensity of manual labor.

[0025] Working Principle: When the organic liquid fertilizer production equipment of this invention is working, organic liquid fertilizer material is first fed into the aeration mechanism 1 through the feed cover 8. The touch module 4 controls the air pump 7 to start, which supplies air to the aeration plate 103 in the aeration mechanism 1. At the same time, the air pump 7 controls the reduction motor 10 to start, which drives the main shaft 9 to rotate. The main shaft 9 drives the first stirring frame 102 and the folding stirring plate 104 to rotate, promoting full contact between the material and the air, and completing the aeration and fermentation process. After the aeration and fermentation are completed, the touch module 4 controls the electric push rod 12 to extend and retract, driving the lifting platform 11, the reduction motor 10, and the main shaft 9 to rise and fall synchronously. The blockage block 13 on the main shaft 9 moves down, exposing the opening at the lower end of the aeration mechanism 1. The fermented material falls into the separation mechanism 2 below by gravity.

[0026] After the material enters the separation mechanism 2, the main shaft 9 drives the second stirring frame 203 to rotate. The second stirring frame 203 stirs the material, promoting the separation of solid impurities and liquid. The liquid falls into the reaction mechanism 6 through the filter screen 204 in the filter tank 201, while the solid impurities remain in the filter tank 201 and can be cleaned periodically through the hinged waste door 202. During this process, the main shaft 9 drives the auxiliary frame 205 to rotate synchronously. The auxiliary roller 208 on the auxiliary frame 205 is always in contact with the lower end of the filter screen 204 under the elastic force of the spring 207, rolling and squeezing the filter screen 204 to prevent clogging and optimize the solid-liquid separation efficiency.

[0027] After the separated filtrate enters the mixing tank 601 of the reaction mechanism 6, the touch module 4 controls the metering pump in the dosing tank 604 to start, injecting the reagent from the reagent storage tank into the mixing tank 601 according to the set amount. The main rotating shaft 9 drives the third stirring frame 602 to rotate, promoting thorough mixing of the reagent and filtrate, completing the humic acid chelation reaction. After the reaction is completed, the liquid outlet valve 603 at the lower end of the mixing tank 601 is opened to discharge the finished organic liquid fertilizer. While one batch of materials completes the reaction, the touch module 4 controls the electric push rod 12 to reset, driving the blocking block 13 to rise and seal the lower opening of the aeration mechanism 1. A new batch of materials is then introduced through the feed cover 8 to start aeration and fermentation, achieving continuous production.

[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An organic liquid fertilizer production device, characterized in that, include: The aeration mechanism (1) has a feed cover (8) at its upper end, which is used to allow organic liquid fertilizer materials to enter and complete aeration and fermentation. Separation mechanism (2) is set at the lower end of aeration mechanism (1), and organic liquid fertilizer material enters its interior for solid-liquid separation; The reaction mechanism (6) allows organic liquid fertilizer materials to enter and undergo humic acid reaction. The main rotating shaft (9) is installed in the middle of the interior of the aeration mechanism (1), the separation mechanism (2) and the reaction mechanism (6); The touch module (4) is located on the side of the reaction mechanism (6).

2. The organic liquid manure production apparatus according to claim 1, characterized in that, The upper end of the main rotating shaft (9) rotates through the lifting platform (11), and a reduction motor (10) is fixed on the upper end of the lifting platform (11). The output end of the reduction motor (10) is fixedly connected to the main rotating shaft (9). The lower end of the lifting platform (11) is symmetrically fixed with two electric push rods (12). The lower end of the electric push rods (12) is supported on the upper end of the aeration mechanism (1), and the electric push rods (12) and the reduction motor (10) are electrically connected to the touch module (4).

3. The organic liquid manure production apparatus according to claim 1, characterized in that, An air pump (7) is fixed on the upper end of one side of the aeration mechanism (1), and a purification tank (14) is fixed on the upper end of the other side. The input end of the purification tank (14) is connected to the air outlet of the aeration mechanism (1). A blockage block (13) is fixed on the main rotating shaft (9) at the middle opening at the lower end of the aeration mechanism (1). The blockage block (13) is adapted to the lower opening of the aeration mechanism (1), and the air pump (7) is electrically connected to the touch module (4).

4. The organic liquid manure production apparatus according to claim 3, characterized in that, The aeration mechanism (1) includes an aeration tank (101) and a first stirring frame (102). The first stirring frame (102) is fixedly mounted on the main rotating shaft (9) and located inside the aeration tank (101). A folding stirring plate (104) is hinged to the lower end of the first stirring frame (102). An aeration plate (103) is embedded in the bottom of the aeration tank (101). The aeration plate (103) is connected to the output end of the air pump (7) through a pipe.

5. The organic liquid manure production apparatus according to claim 1, characterized in that, The separation mechanism (2) includes a filter tank (201), a second stirring rack (203) and an auxiliary rack (205). A filter screen (204) is provided through the bottom of the filter tank (201). The second stirring rack (203) is vertically slidably mounted on the main rotating shaft (9) and is circumferentially fixed to the main rotating shaft (9) by a positioning pin. The second stirring rack (203) is located inside the filter tank (201) and its width gradually decreases from the center to the outside. A waste door (202) is hinged to the side of the filter tank (201) near the bottom opening.

6. An organic liquid manure production apparatus according to claim 5, characterized in that The auxiliary frame (205) is fixedly sleeved on the main rotating shaft (9) and located at the lower end of the filter screen (204). Both ends of the auxiliary frame (205) are vertically slidably provided with lifting columns (206). A spring (207) is connected between the lower end of the lifting column (206) and the lower end face of the auxiliary frame (205). An auxiliary roller (208) is rotatably provided between the two lifting columns (206). The auxiliary roller (208) abuts against the lower end face of the filter screen (204).

7. The organic liquid manure production apparatus according to claim 1, characterized in that, The reaction mechanism (6) includes a mixing tank (601) and a third stirring rack (602). A liquid outlet valve (603) is provided at the discharge port at the lower end of the mixing tank (601). A dosing tank (604) is fixed on the side of the mixing tank (601). A drug storage tank and a metering pump are provided inside the dosing tank (604). The output end of the metering pump is connected to the inside of the mixing tank (601), and the metering pump is electrically connected to the touch module (4). The third stirring rack (602) is fixedly sleeved on the lower end of the main rotating shaft (9) and located inside the mixing tank (601).

8. The organic liquid manure production apparatus according to claim 1, characterized in that, The reaction mechanism (6) is fixedly provided with a support frame (3) at its lower end, and a reinforcing rib (5) is fixedly provided inside the support frame (3).

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