Asphalt flue gas treatment device

Abstract

The utility model belongs to the technical field of asphalt flue gas treatment, and particularly relates to an asphalt flue gas treatment device which comprises a tower body, two activated carbon filter plates and four fixed bare plates, the four fixed bare plates are fixedly mounted in the tower body, a plurality of spray heads are fixedly mounted at the bottoms of the fixed bare plates, a flow guide plate is fixedly mounted at the bottom of an inner cavity of the tower body, and the flow guide plate is fixedly mounted at the bottom of the inner cavity of the tower body. A rectangular pipe is fixedly installed at the bottom of the tower body, a gas inlet pipe is fixedly installed on the front side of the tower body and located above the flow guide plate, a water storage tank is fixedly installed at the bottom of the rectangular pipe, and a second through hole is formed in one end of the rectangular pipe. And therefore, the device can be repeatedly used, the whole device is more environmentally friendly to use, and waste of water resources is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of asphalt fume treatment technology, and in particular relates to an asphalt fume treatment device. Background Technology

[0002] Asphalt fumes are gaseous pollutants generated during the production, processing, and use of asphalt. They are characterized by complex composition and high hazard. Asphalt fumes need to be purified before being emitted to avoid environmental pollution.

[0003] For example, Chinese Patent CN222239408U discloses an asphalt fume treatment device. This utility model relates to the field of fume treatment technology. The asphalt fume treatment device first introduces asphalt fume through an air inlet pipe, and simultaneously uses a liquid inlet pipe to drive disc-shaped and ring-shaped spray heads to spray the asphalt fume entering the tower, thus increasing the contact area between the asphalt fume and water. The disc-shaped and ring-shaped spray heads are arranged in an alternating pattern to separate the internal space of the tower, extending the time the asphalt fume spends inside the tower and optimizing the spray purification effect. A filter box is installed on the exhaust pipe for secondary purification of the discharged gas. The activated carbon material's ability to adsorb harmful gases further optimizes the working efficiency of the asphalt fume treatment device. The connecting plate is detachably connected to the filter box, and the mounting bracket is slidably connected to the filter box, facilitating regular replacement of the adsorption filter element and maintaining the filter box's adsorption performance for harmful gases.

[0004] The aforementioned patent has the following problems:

[0005] The patent has some drawbacks in its use, such as the need for a large amount of water for spraying, and the water after spraying is discharged directly from the outlet pipe. This water is also contaminated and cannot be reused, which wastes water resources. In view of this, we propose an asphalt fume treatment device. Utility Model Content

[0006] The purpose of this invention is to provide an asphalt fume treatment device to solve the problems mentioned in the background art.

[0007] In view of this, the present invention provides an asphalt fume treatment device, comprising a tower body and two activated carbon filter plates, and further comprising:

[0008] Four fixed empty plates are fixedly installed inside the tower body. Several nozzles are fixedly installed at the bottom of each fixed empty plate. A guide plate is fixedly installed at the bottom of the inner cavity of the tower body. A rectangular tube is fixedly installed at the bottom of the tower body. An air inlet pipe is fixedly installed on the front side of the tower body and above the guide plate. A water storage tank is fixedly installed at the bottom of the rectangular tube. A second through hole is opened at one end of the rectangular tube. A first through hole is opened at the top of the water storage tank and communicates with the second through hole. An annular rubber pad is fixedly installed in the first through hole. A cover plate is inserted into the second through hole. An L-shaped plate is fixedly installed at the bottom of the cover plate. Two mounting grooves are opened in the L-shaped plate. Two activated carbon filter plates are fixedly installed in the two mounting grooves respectively. An annular rubber pad that contacts the top of the rectangular tube is fixedly installed at the bottom of the cover plate.

[0009] A water supply assembly is located on a water storage tank and is used to deliver water from the water storage tank to four fixed empty plates.

[0010] In this technical solution, during use, the water supply component is energized and activated. The component draws water from the storage tank and distributes it to four fixed empty plates. Under water pressure, the water in the fixed empty plates is sprayed out through several nozzles. At this time, workers can use the air inlet pipe to transport asphalt fumes into the tower. The water sprayed from the nozzles comes into contact with the asphalt fumes, thus removing pollutants. Because the four fixed empty plates are staggered, the time the asphalt fumes remain in the tower is extended. Subsequently, the asphalt fumes enter the filter box at the top of the tower, where the adsorption filter element adsorbs harmful gases and then discharges to the outside. The water that has treated the asphalt fumes is then collected by the guide plate and flows entirely into a rectangular tube. The bottom of the rectangular tube's inner cavity is inclined. Therefore, the water entering the rectangular tube will move towards the L-shaped plate, allowing the water that has treated the asphalt fumes to come into contact with one of the activated carbon filter plates. One of the activated carbon filter plates will perform preliminary filtration of the water that has treated the asphalt fumes. Subsequently, the water that has treated the asphalt fumes will flow to another activated carbon filter plate for more refined filtration, allowing the filtered water to be reused. Under the action of the second and first annular rubber pads, water can be prevented from flowing to the outside, while ensuring that the water that has treated the asphalt fumes is completely filtered. At this time, the filtered water will re-enter the water storage tank for reuse. When it is necessary to replace the water in the water storage tank, the operator can turn and open the valve on the outlet pipe to discharge the water in the water storage tank to the outside through the outlet pipe. Then, water can be added back into the water storage tank through the inlet pipe.

[0011] In the above technical solution, the water supply component further includes:

[0012] A water pump is fixedly installed on the top of the water storage tank. An inlet pipe is fixedly installed at the inlet end of the water pump. One end of the inlet pipe passes through the top of the water storage tank and extends to a position near the bottom of the inner cavity of the water storage tank. An L-shaped pipe is fixedly installed at the outlet end of the water pump. A connecting pipe fixed to the tower body is fixedly installed at one end of the L-shaped pipe. The inner cavity of the connecting pipe is connected to the inner cavities of four fixed empty plates.

[0013] In this technical solution, the staff will power on and start the water pump. The water pump will draw water from the water storage tank through the inlet pipe. Subsequently, the water pump will deliver the water to the connecting pipe. The water in the connecting pipe will enter the four fixed empty plates respectively. Under the action of water pressure, the water in the fixed empty plates will be sprayed out through several nozzles.

[0014] In the above technical solution, the connecting pipe is further fixedly connected to four fixed empty plates, and the L-shaped pipe is connected to the connecting pipe.

[0015] In this technical solution, it is ensured that the water in the connecting pipe can enter the inner cavity of the four fixed empty plates respectively, and that the water in the L-shaped pipe can enter the connecting pipe.

[0016] In the above technical solution, a feed pipe is fixedly installed on the top of the water storage tank, and a water outlet pipe is fixedly installed on one side of the water storage tank. A valve is rotatably installed on the water outlet pipe.

[0017] In this technical solution, when it is necessary to replace the water in the water storage tank, the staff can turn and open the valve on the water outlet pipe to discharge the water in the water storage tank to the outside through the water outlet pipe, and then add water back into the water storage tank through the feed pipe.

[0018] In the above technical solution, the four fixed empty plates are further arranged in an alternating manner.

[0019] In this technical solution, the four fixed empty plates are arranged in an alternating manner, which can prolong the time that the asphalt fumes stay in the tower, thereby enabling the asphalt fumes to be treated better.

[0020] In the above technical solution, the rectangular tube is further connected to the inner cavity of the tower body.

[0021] In this technical solution, it is ensured that the water that has been treated with asphalt fumes inside the tower can enter the rectangular tube.

[0022] In the above technical solution, the cover plate is further fixed to the rectangular tube by two bolts, the bottom of the L-shaped plate is in close contact with the top of the annular rubber pad, and the bottom of the inner cavity of the rectangular tube is inclined.

[0023] In this technical solution, the cover plate is fixed to the rectangular tube by two bolts, the bottom of the L-shaped plate is in close contact with the top of the annular rubber pad, and the bottom of the inner cavity of the rectangular tube is inclined.

[0024] The beneficial effects of this utility model are:

[0025] This asphalt fume treatment device, through the coordinated arrangement of rectangular tubes, water storage tanks, cover plates, activated carbon filter plates, L-shaped plates, through holes one, annular rubber pad one, annular rubber pad two, through holes two, and water supply components, ensures that the water used to treat asphalt fumes can be filtered and reused, making the overall device more environmentally friendly and avoiding waste of water resources. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0027] Figure 2 This is one of the structural diagrams of the internal structure of the tower body in this utility model;

[0028] Figure 3 This is the second schematic diagram of the internal structure of the tower body in this utility model;

[0029] Figure 4 This is a schematic diagram of the rectangular tube structure in this utility model;

[0030] Figure 5 This is a schematic diagram of the internal structure of the rectangular tube in this utility model;

[0031] Figure 6 This utility model Figure 5 Enlarged structural diagram at point A in the middle;

[0032] Figure 7 This is a schematic cross-sectional view of the rectangular tube in this utility model;

[0033] Figure 8 This is a schematic diagram of the regional structure of the cover plate in this utility model;

[0034] Figure 9 This is a schematic diagram of the L-shaped plate in this utility model;

[0035] Figure 10 This is a schematic diagram of the internal structure of the water storage tank in this utility model.

[0036] The markings in the diagram are as follows:

[0037] 1. Tower body; 2. Connecting pipe; 3. L-shaped pipe; 4. Rectangular pipe; 5. Air inlet pipe; 6. Water storage tank; 7. Water pump; 8. Cover plate; 9. Water outlet pipe; 10. Guide plate; 11. Fixed empty plate; 12. Nozzle; 13. L-shaped plate; 14. Activated carbon filter plate; 15. Through hole one; 16. Annular rubber pad one; 17. Annular rubber pad two; 18. Mounting groove; 19. Through hole two; 20. Water inlet pipe. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0039] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0040] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0041] It should be noted that in the description of this application, the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0042] It should be noted that, in this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0043] Example 1:

[0044] Please see Figure 1 - Figure 10 As shown, this embodiment provides an asphalt fume treatment device, including a tower body 1 and two activated carbon filter plates 14, and further including:

[0045] Four fixed empty plates 11 are fixedly installed inside the tower body 1. Several nozzles 12 are fixedly installed at the bottom of the fixed empty plates 11. A guide plate 10 is fixedly installed at the bottom of the inner cavity of the tower body 1. A rectangular tube 4 is fixedly installed at the bottom of the tower body 1. An air inlet pipe 5 is fixedly installed on the front side of the tower body 1 and above the guide plate 10. A water storage tank 6 is fixedly installed at the bottom of the rectangular tube 4. A through hole 2 19 is opened at one end of the rectangular tube 4. A through hole 15 connected to the through hole 2 19 is opened at the top of the water storage tank 6. An annular rubber pad 16 is fixedly installed in the through hole 15. A cover plate 8 is inserted into the through hole 2 19. An L-shaped plate 13 is fixedly installed at the bottom of the cover plate 8. Two installation slots 18 are opened in the L-shaped plate 13. Two activated carbon filter plates 14 are fixedly installed in the two installation slots 18 respectively. An annular rubber pad 2 17 that contacts the top of the rectangular tube 4 is fixedly installed at the bottom of the cover plate 8.

[0046] A water supply assembly is located on the water storage tank 6 and is used to transport water from the water storage tank 6 to the four fixed empty plates 11.

[0047] In operation, the water supply component is powered on and activated, drawing water from the storage tank 6 and distributing it to four fixed empty plates 11. Under water pressure, the water in the fixed empty plates 11 is sprayed out through several nozzles 12. At this time, workers can use the air inlet pipe 5 to transport asphalt fumes into the tower body 1. The water sprayed from the nozzles 12 comes into contact with the asphalt fumes, removing pollutants. Because the four fixed empty plates 11 are staggered, the time the asphalt fumes remain in the tower body 1 is extended. Subsequently, the asphalt fumes enter the filter box at the top of the tower body 1, where the adsorption filter element adsorbs harmful gases and then discharges to the outside. The water treated by the asphalt fumes is then collected by the guide plate 10 and flows entirely into the rectangular tube 4. Because the bottom of the inner cavity of the rectangular tube 4 is inclined, The water entering the rectangular tube 4 will move towards the L-shaped plate 13, causing the water that has treated the asphalt fumes to come into contact with one of the activated carbon filter plates 14. One of the activated carbon filter plates 14 will perform preliminary filtration on the water that has treated the asphalt fumes. Then, the water that has treated the asphalt fumes will flow to another activated carbon filter plate 14 for more fine filtration, so that the filtered water can be reused. Under the action of the second annular rubber pad 17 and the first annular rubber pad 16, water can be prevented from flowing to the outside, while ensuring that the water that has treated the asphalt fumes is completely filtered. At this time, the filtered water will re-enter the water storage tank 6, so that it can be reused. When it is necessary to replace the water in the water storage tank 6, the operator can turn and open the valve on the water outlet pipe 9, so that the water in the water storage tank 6 can be discharged to the outside through the water outlet pipe 9. Then, water can be added back into the water storage tank 6 through the feed pipe.

[0048] Example 2:

[0049] This embodiment provides an asphalt fume treatment device, which, in addition to the technical solutions of the above embodiments, also has the following technical features, including a water supply component:

[0050] Water pump 7 is fixedly installed on the top of water storage tank 6. Water inlet pipe 20 is fixedly installed at the water inlet end of water pump 7. One end of water inlet pipe 20 passes through the top of water storage tank 6 and extends to the inner cavity of water storage tank 6 near the bottom. L-shaped pipe 3 is fixedly installed at the water outlet end of water pump 7. Connecting pipe 2, which is fixed to tower body 1, is fixedly installed at one end of L-shaped pipe 3. The inner cavity of connecting pipe 2 is connected to the inner cavity of four fixed empty plates 11.

[0051] The staff will power on and start the water pump 7. The water pump 7 will draw water from the water storage tank 6 through the water inlet pipe 20. Then, the water pump 7 will deliver the water to the connecting pipe 2. The water in the connecting pipe 2 will enter the four fixed empty plates 11 respectively. Under the action of water pressure, the water in the fixed empty plates 11 will be sprayed out through several nozzles 12.

[0052] Example 3:

[0053] This embodiment provides an asphalt fume treatment device, which, in addition to the technical solution of the above embodiment, also has the following technical features: the connecting pipe 2 is fixedly connected to four fixed empty plates 11, and the L-shaped pipe 3 is connected to the connecting pipe 2.

[0054] Specifically, this ensures that the water in the connecting pipe 2 can enter the inner cavities of the four fixed empty plates 11 respectively, and that the water in the L-shaped pipe 3 can enter the connecting pipe 2.

[0055] Example 4:

[0056] This embodiment provides an asphalt fume treatment device, which, in addition to the technical solutions of the above embodiments, also has the following technical features: a feed pipe is fixedly installed on the top of the water storage tank 6, a water outlet pipe 9 is fixedly installed on one side of the water storage tank 6, and a valve is rotatably installed on the water outlet pipe 9.

[0057] When it is necessary to replace the water in the water storage tank 6, the staff can turn and open the valve on the water outlet pipe 9 to discharge the water in the water storage tank 6 to the outside through the water outlet pipe 9, and then add water back into the water storage tank 6 through the feed pipe.

[0058] Example 5:

[0059] This embodiment provides an asphalt fume treatment device, which, in addition to the technical solution of the above embodiment, also has the following technical features: four fixed empty plates 11 are arranged in an alternating manner.

[0060] The four fixed empty plates 11 are staggered, which can prolong the time that the asphalt fumes stay in the tower body 1, thereby enabling the asphalt fumes to be treated better.

[0061] Example 6:

[0062] This embodiment provides an asphalt fume treatment device, which, in addition to the technical solutions of the above embodiments, also has the following technical features: the rectangular tube 4 is connected to the inner cavity of the tower body 1.

[0063] Among these measures, it is ensured that the water used to treat asphalt fumes inside tower 1 can enter the rectangular pipe 4.

[0064] Example 7:

[0065] This embodiment provides an asphalt fume treatment device, which, in addition to the technical solutions of the above embodiments, also has the following technical features: the cover plate 8 is fixed to the rectangular tube 4 by two bolts, the bottom of the L-shaped plate 13 is in close contact with the top of the annular rubber pad 16, and the bottom of the inner cavity of the rectangular tube 4 is inclined.

[0066] Specifically, a wrench should be used to remove the two bolts, allowing the cover plate 8 to be removed and the activated carbon filter plate 14 to be replaced. This ensures that all water treated with asphalt fumes is filtered under the action of the annular rubber pad 16, preventing unfiltered water from directly entering the water storage tank 6. The water treated with asphalt fumes will be collected by the guide plate 10 and flow into the rectangular tube 4. Because the bottom of the inner cavity of the rectangular tube 4 is inclined, the water entering the rectangular tube 4 will move towards the L-shaped plate 13, causing the water treated with asphalt fumes to come into contact with one of the activated carbon filter plates 14. One of the activated carbon filter plates 14 will perform preliminary filtration of the water treated with asphalt fumes.

[0067] Working Principle: During operation, the operator powers on and starts the water pump 7. The pump 7 draws water from the storage tank 6 through the inlet pipe 20. The water is then transported to the connecting pipe 2, which in turn flows into four fixed empty plates 11. Under water pressure, the water in the fixed empty plates 11 is sprayed out through several nozzles 12. At this time, the operator can transport the asphalt fumes to the tower body 1 through the air inlet pipe 5. The water sprayed from the nozzles 12 comes into contact with the asphalt fumes, removing pollutants. Because the four fixed empty plates 11 are staggered, the time the asphalt fumes remain in the tower body 1 is extended. Subsequently, the asphalt fumes enter the filter box at the top of the tower body 1, where the adsorption filter element adsorbs harmful gases and then discharges them to the outside. The water that has treated the asphalt fumes is then collected by the guide plate 10 and flows entirely into the rectangular pipe 4. The bottom of the inner cavity of the rectangular tube 4 is inclined, so the water entering the rectangular tube 4 will move towards the L-shaped plate 13, so that the water that has been treated with asphalt fumes will come into contact with one of the activated carbon filter plates 14. One of the activated carbon filter plates 14 will perform preliminary filtration on the water that has been treated with asphalt fumes. Then the water that has been treated with asphalt fumes will flow to another activated carbon filter plate 14 for more fine filtration, so that the filtered water can be reused. Under the action of the second annular rubber pad 17 and the first annular rubber pad 16, water can be prevented from flowing to the outside, while ensuring that the water that has been treated with asphalt fumes is completely filtered. At this time, the filtered water will re-enter the water storage tank 6, so that it can be reused. When it is necessary to replace the water in the water storage tank 6, the operator can turn and open the valve on the outlet pipe 9 to discharge the water in the water storage tank 6 to the outside through the outlet pipe 9. Then, water can be added back into the water storage tank 6 through the feed pipe.

[0068] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. An asphalt fume treatment device, comprising a tower body (1) and two activated carbon filter plates (14), characterized in that, Also includes: Four fixed empty plates (11) are fixedly installed inside the tower body (1). Several nozzles (12) are fixedly installed at the bottom of the fixed empty plates (11). A guide plate (10) is fixedly installed at the bottom of the inner cavity of the tower body (1). A rectangular tube (4) is fixedly installed at the bottom of the tower body (1). An air inlet pipe (5) is fixedly installed on the front side of the tower body (1) and above the guide plate (10). A water storage tank (6) is fixedly installed at the bottom of the rectangular tube (4). A through hole (19) is opened at one end of the rectangular tube (4). The top of the box (6) is provided with a through hole (15) that communicates with the through hole (2) (19). A ring rubber pad (16) is fixedly installed in the through hole (15). A cover plate (8) is inserted into the through hole (2) (19). An L-shaped plate (13) is fixedly installed at the bottom of the cover plate (8). Two mounting grooves (18) are provided in the L-shaped plate (13). Two activated carbon filter plates (14) are fixedly installed in the two mounting grooves (18) respectively. A ring rubber pad (2) that contacts the top of the rectangular tube (4) is fixedly installed at the bottom of the cover plate (8). A water supply assembly is located on a water storage tank (6) and is used to deliver water from the water storage tank (6) to four fixed empty plates (11).

2. The asphalt fume treatment device according to claim 1, characterized in that, The water supply components include: A water pump (7) is fixedly installed on the top of a water storage tank (6). A water inlet pipe (20) is fixedly installed at the water inlet end of the water pump (7). One end of the water inlet pipe (20) passes through the top of the water storage tank (6) and extends to the bottom of the inner cavity of the water storage tank (6). An L-shaped pipe (3) is fixedly installed at the water outlet end of the water pump (7). A connecting pipe (2) fixed to the tower body (1) is fixedly installed at one end of the L-shaped pipe (3). The inner cavity of the connecting pipe (2) is connected to the inner cavities of four fixed empty plates (11).

3. The asphalt fume treatment device according to claim 2, characterized in that, The connecting pipe (2) is fixedly connected to four fixed empty plates (11), and the L-shaped pipe (3) is connected to the connecting pipe (2).

4. The asphalt fume treatment device according to claim 1, characterized in that, A feed pipe is fixedly installed on the top of the water storage tank (6), and a water outlet pipe (9) is fixedly installed on one side of the water storage tank (6). A valve is rotatably installed on the water outlet pipe (9).

5. The asphalt fume treatment device according to claim 1, characterized in that, The four fixed empty plates (11) are arranged in an alternating manner.

6. The asphalt fume treatment device according to claim 1, characterized in that, The rectangular tube (4) is connected to the inner cavity of the tower body (1).

7. The asphalt fume treatment device according to claim 1, characterized in that, The cover plate (8) is fixed to the rectangular tube (4) by two bolts. The bottom of the L-shaped plate (13) is in close contact with the top of the annular rubber pad (16). The bottom of the inner cavity of the rectangular tube (4) is inclined.

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