A highly efficient heater core tube

Abstract

The application discloses a high-efficiency heating furnace core pipe, which comprises a pipe body, a main air pipe and a plurality of air distribution pipes; the pipe body is a hollow cylinder with open ends; the main air pipe is arranged in the pipe body, and the two ends of the main air pipe pass through the end portions of the pipe body; the length direction of the main air pipe is parallel to the axis of the pipe body; the main air pipe is provided with the air distribution pipes in the radial direction; the air distribution pipes are arranged at intervals along the length direction of the main air pipe; the air distribution pipes are respectively communicated with the main air pipe; and the air distribution pipes are provided with air outlets. The rotary furnace is usually provided with an air inlet at the front end of the furnace pipe, the gas in the furnace is unevenly distributed, and the reaction efficiency is low; the main air pipe and the air distribution pipes are designed, the gas is input from the main air pipe, the gas is output by the air distribution pipes which are arranged at intervals along the length direction of the main air pipe in different areas of the pipe body, the problem of uneven gas distribution in the furnace is solved, and the reaction efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of rotary kiln technology, and more particularly to a high-efficiency heating core tube. Background Technology

[0002] As a key heating device in industrial production, the design and performance of rotary kilns directly affect the heating quality of materials and production efficiency. Traditional rotary kilns mainly supply air into the furnace through fixed air inlets on the side of the furnace body to achieve the heating process of materials. This design met basic production needs in early industrial applications, but with the development of technology and the improvement of production standards, its design concept and functional implementation have gradually revealed limitations.

[0003] Current industrial production places increasingly stringent demands on the efficiency, uniformity, and environmental friendliness of heating equipment. High-efficiency heating can significantly shorten production cycles and increase capacity; uniform heating ensures product quality and meets the needs of precision manufacturing. However, existing rotary kiln air intake systems do not perform ideally in these aspects, and technological innovation and improvement are urgently needed to meet the high standards of modern industry.

[0004] Specifically, existing rotary kiln air intake systems suffer from several major problems: First, uneven air intake leads to inconsistent heating of materials within the kiln, affecting the quality of the final product; second, low reaction efficiency is caused by the fixed position and design of the air inlet, limiting sufficient contact between the gas and the material; and finally, high energy consumption is due to energy waste caused by insufficient reaction efficiency, increasing production costs. These problems limit the application potential of rotary kilns in modern industrial production and urgently require solutions through technological innovation. Summary of the Invention

[0005] To address the aforementioned shortcomings, the present invention aims to propose a high-efficiency heating furnace core tube to solve the problems of uneven gas distribution, uneven material heating, unstable product quality, and low reaction efficiency in the prior art.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A high-efficiency heating furnace core tube includes a tube body, a main air duct, and several branch air ducts;

[0008] The tube body is a hollow cylinder with openings at both ends;

[0009] The main air duct is inserted into the pipe body, and both ends of the main air duct extend out of the pipe body. The length direction of the main air duct is parallel to the axis of the pipe body. The main air duct is provided with branch air ducts in the radial direction. Several branch air ducts are arranged at intervals along the length direction of the main air duct. The branch air ducts are respectively connected to the main air duct and are provided with air outlets.

[0010] Specifically, it further comprises a front sealing cover and a rear sealing cover, both ends of the pipe body are connected with the front sealing cover and the rear sealing cover respectively; the front end of the main air pipe is connected with the external fixing structure through an air pipe front end fixing point, and the rear end of the main air pipe is connected with the rear sealing cover through a movable sealing device.

[0011] Specifically, the movable sealing device comprises an air pipe sealing platform, a sealing outer ring and a sealing compression ring, the air pipe sealing platform is sleeved outside the main air pipe, the sealing compression ring is sleeved outside the air pipe sealing platform, the rear sealing cover is provided with the sealing outer ring, the sealing compression ring is fixedly sleeved outside the air pipe sealing platform, part of the sealing compression ring is located between the air pipe sealing platform and the sealing outer ring, the sealing outer ring and the sealing compression ring are installed in compression fit through a bolt and an elastic element, the elastic element is sleeved on the screw rod of the bolt, one end of the elastic element abuts against the nut of the bolt, the other end of the elastic element abuts against the sealing compression ring, the screw rod of the bolt is threadedly connected with the sealing outer ring after penetrating through the sealing compression ring, and the area surrounded by the sealing outer ring, the air pipe sealing platform, the rear sealing cover and the sealing compression ring is filled with a sealing material.

[0012] Specifically, it further comprises an air pipe support, and the air pipe support is provided with at least one air pipe support, which is used for supporting the middle part of the main air pipe.

[0013] Specifically, the air pipe support comprises a supporting leg, and the supporting leg is provided with at least one supporting leg, one end of the supporting leg is fixed to the inner wall of the pipe body, and the other end of the supporting leg supports and connects the outer side of the main air pipe.

[0014] Specifically, the air pipe support further comprises a sleeving ring assembly, the other end of the supporting leg is connected with the main air pipe through the sleeving ring assembly, the main air pipe penetrates through the sleeving ring assembly, the outer periphery of the main air pipe is provided with a thickened ring, the position of the thickened ring matches the sleeving ring assembly, and the sleeving ring assembly and the thickened ring are relatively movable.

[0015] Specifically, the sleeving ring assembly comprises a supporting ring and a wear-resistant ring which are sleeved in sequence from outside to inside, and the inner periphery of the wear-resistant ring is in contact with the outer periphery of the thickened ring.

[0016] Specifically, the front end and the rear end of the main air pipe are respectively provided with a gas supply device.

[0017] Specifically, the branch air pipes are distributed in the lower area of the main air pipe, the ends of the branch air pipes are located in the range close to the pipe body, and at least one air outlet is arranged at the end of each branch air pipe.

[0018] Specifically, several of the air distribution pipes are arranged in a circumferentially spaced manner along the main air pipe;

[0019] The air distribution pipes are arranged in the material ascending region of the pipe body, and the air distribution pipes are arranged in the lower region of the main air pipe; the air outlet is an inclined cut, the inclined cuts of several of the air distribution pipes are located on the same side of the end of the air distribution pipe, and the inclined cut faces the material descending region of the pipe body.

[0020] The technical solution provided by the present application can include the following beneficial effects:

[0021] 1. By designing the main air pipe and the air distribution pipe, the gas input from the main air pipe is output in different regions of the pipe body by the plurality of air distribution pipes arranged in a spaced manner along the length direction of the main air pipe, thereby solving the problem of uneven gas distribution in the furnace and improving the reaction efficiency.

[0022] 2. By using the movable sealing device, the main air pipe can be telescoped within a set range while maintaining the sealing state in the pipe, thereby not affecting the overall operation of the equipment, and solving the problem that the main air pipe is easily damaged due to thermal expansion and lengthening.

[0023] 3. By using the air pipe support with a multi-layer sleeve ring design, dynamic surrounding support is provided for the middle part of the main air pipe, thereby solving the problem that the main air pipe cannot maintain stable operation in the equipment due to its length. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The figure is a structural schematic diagram of the furnace core pipe in the embodiment of the present application.

[0025] Figure 2 The figure is a structural schematic diagram of the furnace core pipe in the embodiment of the present application Figure 1 The figure is a local enlarged schematic diagram of position A in the embodiment of the present application

[0026] Figure 3 The figure is a structural schematic diagram of the air pipe installed in the furnace core pipe in the embodiment of the present application.

[0027] Figure 4 The figure is a structural schematic diagram of the air pipe support installed in the furnace core pipe in the embodiment of the present application.

[0028] Wherein: pipe body 1, main air pipe 2, air distribution pipe 3, front sealing cover 4, rear sealing cover 5, air pipe front end fixed point 6, movable sealing device 7, air pipe support 8, material 9, air outlet 10, material ascending region 11, material descending region 12;

[0029] Air pipe sealing table 71, sealing outer ring 72, sealing compression ring 73, bolt 74, elastic member 75, sealing material 76;

[0030] Supporting leg 81, supporting ring 82, wear-resistant ring 83, and thickened ring 84. DETAILED DESCRIPTION

[0031] Embodiments of the present application are described below in detail with reference to the accompanying drawings, wherein the same or similar components or components having the same or similar functions are denoted by the same or similar reference numerals throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are only used to explain the present application and cannot be understood as a limitation of the present application.

[0032] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features, which are used to distinguish the described features, and have no order or importance.

[0033] In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0034] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] The following describes a high-efficiency heating core pipe according to an embodiment of the present application in conjunction with Figures 1 to 4 The high-efficiency heating core pipe according to an embodiment of the present application comprises a pipe body 1, a main air pipe 2, and a plurality of air distribution pipes 3.

[0036] The pipe body 1 is a hollow cylinder with both ends open;

[0037] The main air pipe 2 is arranged in the pipe body 1, and both ends of the main air pipe 2 pass through the end of the pipe body 1, the length direction of the main air pipe 2 is parallel to the axis of the pipe body 1, the main air pipe 2 is provided with the air distribution pipe 3 in the radial direction, a plurality of air distribution pipes 3 are arranged along the length direction of the main air pipe 2, the air distribution pipes 3 are respectively in communication with the main air pipe 2, and the air distribution pipes 3 are provided with air outlets 10.

[0038] The rotary furnace is usually designed with an air inlet at the front end of the furnace tube, and the gas distribution in the furnace is uneven, and the reaction efficiency is low, the present application solves the problem of uneven gas distribution in the furnace by the design of the main air pipe and the branch air pipe, and improves the reaction efficiency.

[0039] Preferably, the axis of the main air pipe 2 and the axis of the pipe body 1 overlap each other, ensuring that the installation of the main air pipe 2 does not affect the rotation of the pipe body 1, and is convenient to install.

[0040] In another embodiment, it further comprises a front sealing cover 4 and a rear sealing cover 5, the two ends of the pipe body 1 are respectively connected with the front sealing cover 4 and the rear sealing cover 5, the front end of the main air pipe 2 is connected with the external fixed structure through the air pipe front end fixed point 6, and the rear end of the main air pipe 2 is connected with the rear sealing cover 5 through the movable sealing device 7.

[0041] With this structure, a sealed space is formed in the core pipe of the furnace, and the main air pipe 2 will become longer due to thermal expansion and contraction after the temperature rises, and by using the movable sealing device, the main air pipe 2 can be stretched and contracted within a certain range without affecting the operation, solving the problem that the main air pipe 2 is easily damaged due to deformation caused by thermal expansion and contraction.

[0042] Specifically, as shown in Figure 2 The movable sealing device 7 comprises an air pipe sealing table 71, a sealing outer ring 72 and a sealing compression ring 73, the air pipe sealing table 71 is sleeved outside the main air pipe 2, the sealing compression ring 73 is sleeved outside the air pipe sealing table 71, the rear sealing cover 5 is provided with the sealing outer ring 72, the sealing compression ring 73 is fixedly sleeved outside the air pipe sealing table 71, part of the structure of the sealing compression ring 73 is located between the air pipe sealing table 71 and the sealing outer ring 72, the sealing outer ring 72 and the sealing compression ring 73 are installed by screw 74 and elastic element 75, the elastic element 75 is sleeved on the screw rod of the screw 74, one end of the elastic element 75 abuts against the nut of the screw 74, the other end of the elastic element 75 abuts against the sealing compression ring 73, the screw rod of the screw 74 passes through the sealing compression ring 73 and is threadedly connected with the sealing outer ring 72, and the area surrounded by the sealing outer ring 72, the air pipe sealing table 71, the rear sealing cover 5 and the sealing compression ring 73 is filled with sealing material 76.

[0043] The wind pipe sealing table 71 can increase the local connection rigidity of the main wind pipe 2. The sealing pressure ring 73 is partially arranged between the wind pipe sealing table 71 and the sealing outer ring 72, and is used to limit and install the main wind pipe 2 and the rear sealing cover 5. The sealing outer ring 72 and the sealing pressure ring 73 are compressed by the bolts 74 and the elastic members 75. The elastic members 75 are used to realize the self-adaptability of the sealing pressure ring 73. When the main wind pipe 2 is heated and lengthened, the elastic members 75 are compressed by the sealing pressure ring 73. At the same time, the elastic members 75 also restrict the sealing pressure ring 73 due to the limiting effect of the bolts 74 and the sealing outer ring 72. Therefore, the main wind pipe 2 and the rear sealing cover 5 can be kept sealed within the extension range of the main wind pipe 2. The sealing material 76 is used to further improve the sealing performance. The movable sealing device 7 is used to solve the problem of poor sealing performance of the main wind pipe 2 within the set range.

[0044] In another embodiment, a wind pipe support 8 is further included. The wind pipe support 8 is provided with at least one, and is used to support the middle part of the main wind pipe 2.

[0045] The wind pipe support 8 is used to support the middle part of the main wind pipe 2, so as to solve the problem of bending deformation of the main wind pipe 2 due to gravity, and improve the service life of the equipment. It should be noted that a plurality of wind pipe supports 8 are provided. The plurality of wind pipe supports 8 are arranged at intervals along the length direction of the main wind pipe 2. The plurality of wind pipe supports 8 are used to provide stable support for the main wind pipe 2, so as to avoid the bending deformation of the main wind pipe 2 due to gravity, and ensure that the main wind pipe 2 is located on the central axis of the pipe body 1. The specific number of the wind pipe supports 8 is determined by the size, material, weight and length of the main wind pipe 2.

[0046] Specifically, as shown in Figure 4 The wind pipe support 8 includes a support leg 81. The support leg 81 is provided with at least one. One end of the support leg 81 is fixed to the inner wall of the pipe body 1. The other end of the support leg 81 supports and connects the outer side of the main wind pipe 2.

[0047] With this structure, one end of the wind pipe support 8 is fixed to the pipe body 1. The other end of the wind pipe support 8 is movably connected with the main wind pipe 2. When the equipment is running, the pipe body 1 drives the wind pipe support 8 to rotate around the main wind pipe 2 when the pipe body 1 rotates. Thus, the problem that the middle part of the main wind pipe 2 cannot be supported when the pipe body 1 rotates is solved.

[0048] Preferably, the wind pipe support 8 further includes a sleeving ring assembly. The other end of the support leg 81 is connected with the main wind pipe 2 through the sleeving ring assembly. The main wind pipe 2 is arranged in the sleeving ring assembly. The outer periphery of the main wind pipe 2 is provided with a thickened ring 84. The position of the thickened ring 84 matches the sleeving ring assembly. The sleeving ring assembly and the thickened ring 84 are movably arranged.

[0049] When the pipe body 1 rotates, the air pipe support 8 rotates around the main air pipe 2, and the sleeve ring assembly rotates with the rotation of the air pipe support 8. Through the arrangement of the sleeve ring assembly and the thickened ring 84, the relative rotation stability between the pipe body 1 and the main air pipe 2 is improved. The arrangement of the sleeve ring assembly can improve the service life of the air pipe support 8. The air pipe support 8 is divided into a support foot 81 and a sleeve ring assembly, which realizes the replacement of the local structure and makes the subsequent maintenance more convenient.

[0050] Specifically, the sleeve ring assembly comprises a support ring 82 and a wear-resistant ring 83 which are sequentially sleeved from outside to inside. The inner periphery of the wear-resistant ring 83 is in contact with the outer periphery of the thickened ring 84.

[0051] When the air pipe support 8 rotates around the main air pipe 2 for support, the friction between the air pipe support 8 and the main air pipe 2 can easily cause the contact part of the air pipe support 8 and the main air pipe 2 to wear. By increasing the support ring 82 and the wear-resistant ring 83 and adopting a multi-layer structure, the support ring 82 connects the support foot 81 to form a stable annular support surface. Meanwhile, the thickened ring 84 is additionally arranged around the outer periphery of the main air pipe 2 to increase the local rigidity of the main air pipe 2, so that the main air pipe 2 is protected from being deformed due to local support stress. The sleeve arrangement of the wear-resistant ring 83 between the support ring 82 and the thickened ring 84 can reduce the friction, and the wear-resistant ring 83 as a wear-prone part can be replaced alone, thereby solving the problem of inconvenient maintenance caused by equipment wear due to friction and improving the overall service life of the equipment.

[0052] Preferably, the support ring 82, the wear-resistant ring 83 or the thickened ring 84 is a circular ring composed of at least two arc-shaped parts. By adopting this structure, the problem of difficult installation and maintenance of the air pipe support 8 due to the presence of the branch air pipe 3 is solved.

[0053] Preferably, the support foot 81 is at least three, and the three support feet 81 are arranged at equal intervals on the outer periphery of the sleeve ring assembly. By arranging a plurality of support feet 81 at equal intervals, the stability of the air pipe support 8 is improved. Preferably, the number of support feet 81 is four, and the four support feet 81 are distributed in a cross structure on the outer periphery of the sleeve ring assembly.

[0054] In another embodiment, the front and rear ends of the main air pipe 2 are respectively circumscribed with gas supply devices.

[0055] By adopting the two-end open gas supply mode, both ends can serve as air inlets to simultaneously input gas, thereby solving the problem of uneven distribution of gas in the furnace core pipe and improving the reaction efficiency.

[0056] Specifically, the branch air pipe 3 is distributed in the lower region of the main air pipe 2, the end of the branch air pipe 3 is located in the range close to the pipe body 1, and at least one air outlet 10 is arranged at the end of the branch air pipe 3.

[0057] With this structure, the air distribution pipe 3 can be directly inserted into the material 9, so that the air outlet 10 is inside the material 9. The gas is used to stir the material 9, which solves the problem of insufficient contact between the gas and the material 9 and improves the reaction efficiency.

[0058] To further explain, the area where the pipe can move the material upward when it rotates is defined as the material rising area 11 of the pipe, and the area where the material falls freely when the pipe rotates is defined as the material falling area 12 of the pipe.

[0059] In one embodiment, the air distribution pipe 3 can be distributed in the material descending area 12 within the pipe body 1. However, in this case, the air distribution pipe 3 needs to be distributed in the area above the main air pipe 2. At this time, the air outlet 10 needs to face downward or be set in a radial direction perpendicular to the pipe body 1 to avoid the material 9 blocking the air distribution pipe 3.

[0060] Specifically, a plurality of the branch air ducts 3 are arranged at circumferential intervals on the main air duct 2;

[0061] The air distribution pipes 3 are distributed in the material rising area 11 within the pipe body 1, and the air distribution pipes 3 are distributed in the area below the main air pipe 2; the air outlet 10 is an inclined cut, and the inclined cuts of several air distribution pipes 3 are located on the same side of the end of the air distribution pipe 3, and the inclined cuts face the material falling area 12 of the pipe body 1.

[0062] One type of distribution duct 3 is spaced along the length of the main duct 2, while the other type of distribution duct 3 is spaced along the circumference of the main duct 2. This can make the gas distribution more uniform and improve the reaction efficiency.

[0063] In a more preferred embodiment, such as Figure 3 As shown, the distribution pipes 3 are located in the material rising area 11 within the pipe body 1, and are situated below the main air pipe 2. During operation, the distribution pipes 3 are inserted into the material, allowing for more thorough contact between the gas and the material 9, improving reaction efficiency and effectively reducing energy consumption. Furthermore, the outlet 10 has an inclined cut facing the material falling area 12 of the pipe body 1. This prevents the material 9 from easily entering the inclined cut and blocking the distribution pipes 3 during mixing and tumbling within the pipe body 1. Simultaneously, the airflow formed by these circumferentially spaced distribution pipes 3 is opposite to the rotation direction of the pipe body 1, further contributing to improved reaction efficiency.

[0064] Other components and operations of a high-efficiency heating furnace core tube according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0065] In the description of the specification, the description using the terms "embodiment", "example", and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in an appropriate manner.

[0066] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, alternatives, and variations can be made thereto without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.

Claims

1. A highly efficient heater core tube characterized by, The pipe body, the main air pipe and a plurality of branch air pipes; The pipe body is a hollow cylinder with open ends; The main air pipe is arranged in the pipe body, and the two ends of the main air pipe pass through the end portions of the pipe body, the length direction of the main air pipe is parallel to the axis of the pipe body, the main air pipe is provided with the branch air pipes in the radial direction, a plurality of the branch air pipes are arranged at intervals along the length direction of the main air pipe, the branch air pipes are respectively communicated with the main air pipe, and the branch air pipes are provided with air outlets; Further comprising a front sealing cover and a rear sealing cover, the two ends of the pipe body are respectively connected with the front sealing cover and the rear sealing cover; The front end of the main air pipe is connected with an external fixing structure through an air pipe front end fixing point, and the rear end of the main air pipe is connected with the rear sealing cover through a movable sealing device; The movable sealing device comprises an air pipe sealing table, a sealing outer ring and a sealing compression ring, the air pipe sealing table is arranged outside the main air pipe, the sealing compression ring is arranged outside the air pipe sealing table, the rear sealing cover is provided with the sealing outer ring, the sealing compression ring is fixedly arranged outside the air pipe sealing table, part of the sealing compression ring is located between the air pipe sealing table and the sealing outer ring, the sealing outer ring and the sealing compression ring are installed in compression fit through a bolt and an elastic element, the elastic element is arranged on the screw rod of the bolt, one end of the elastic element abuts against the nut of the bolt, the other end of the elastic element abuts against the sealing compression ring, the screw rod of the bolt is threadedly connected with the sealing outer ring after passing through the sealing compression ring, and the area surrounded by the sealing outer ring, the air pipe sealing table, the rear sealing cover and the sealing compression ring is filled with a sealing material; Further comprising an air pipe support, at least one air pipe support is arranged, and the air pipe support is used for supporting the middle portion of the main air pipe; The air pipe support comprises a support leg, at least one support leg is arranged, one end of the support leg is fixed to the inner wall of the pipe body, and the other end of the support leg supports the outer side of the main air pipe; The air pipe support further comprises a sleeving ring assembly, the other end of the support leg is connected with the main air pipe through the sleeving ring assembly, the main air pipe is arranged in the sleeving ring assembly, the outer periphery of the main air pipe is provided with a thickened ring, the position of the thickened ring matches the sleeving ring assembly, and the sleeving ring assembly and the thickened ring are arranged in relative movement.

2. A highly heated core tube as claimed in claim 1, wherein, The sleeving ring assembly comprises a support ring and a wear-resistant ring arranged in sequence from outside to inside, and the inner periphery of the wear-resistant ring is in contact with the outer periphery of the thickened ring.

3. A highly heated core tube as claimed in claim 1, wherein, Air supply devices are arranged outside the front end and the rear end of the main air pipe.

4. A high efficiency heated core tube as defined in claim 1, wherein, The branch air pipes are arranged below the main air pipe, the ends of the branch air pipes are located in the range close to the pipe body, and at least one air outlet is arranged at the end of each branch air pipe.

5. A high efficiency heated core tube as defined in claim 1, wherein, A plurality of the branch air pipes are arranged at intervals in the circumferential direction of the main air pipe. The air distribution pipe is distributed in the material ascending area in the pipe body, and the air distribution pipe is distributed in the lower area of the main air pipe; the air outlet is an inclined cut, the inclined cuts of the air distribution pipes are located on the same side of the end of the air distribution pipe, and the inclined cut faces the material descending area of the pipe body.

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