Steel pipe cutting device based on ship machining
By designing a steel pipe cutting device including a cutting mechanism and an efficient clamping mechanism, the problem of difficulty in cutting complex angle steel pipes in traditional devices is solved, and the precise positioning and cutting of steel pipes is achieved, which improves cutting stability and production efficiency.
Patent Information
- Application Number
- CN202510440797.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-09
- Publication Date
- 2025-06-24
AI Technical Summary
Traditional steel pipe cutting devices are difficult to achieve accurate cutting of steel pipes with complex angles such as 90 degrees bent, and clamping devices are difficult to provide stability when cutting in bevels, resulting in low cutting accuracy and safety risks.
A steel pipe cutting device including a cutting mechanism and a clamping mechanism is designed. The clamping mechanism realizes precise positioning and cutting of the steel pipe by adjusting the adjustment column driven by the motor and the linear moving mechanism. The clamping device uses a driving motor to control the rotation of the screw to adjust the clamping force, and uses an electromagnetic fixing the limiting plate to ensure the stability of the steel pipe.
Accurate cutting of steel pipes of different diameters and shapes is achieved, especially steel pipes with a 90-degree bent, which can flexibly cut vertically or transversely inclined surfaces, improving cutting flexibility and stability, reducing waste rate and labor intensity, and improving production efficiency.
Smart Images
Figure CN120190410A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of ship processing, and particularly to a steel pipe cutting device based on ship processing. Background Art
[0002] As is well known, in the field of ship processing, steel pipe cutting is a crucial process. However, in actual operation, traditional steel pipe cutting devices have a series of technical and operational challenges and limitations. Traditional cutting equipment can usually only perform simple straight cutting operations. For cutting operations that require different angles (especially complex angles such as inclined planes and bending parts), there are often no effective solutions. For example, when dealing with a steel pipe with a 90-degree bend, to achieve precise angle cutting such as vertical or horizontal inclined plane cutting, it is very difficult for traditional equipment to meet the requirements. This limitation leads to low work efficiency and increases the operation difficulty and risk because workers may need to manually adjust the position of the steel pipe to achieve the required cutting angle. When performing inclined plane cutting on a steel pipe, due to the shape characteristics of the steel pipe itself, especially for bent steel pipes, existing clamping devices are difficult to provide sufficient stability, easily causing the steel pipe to displace during the cutting process. This not only reduces the cutting accuracy but also may lead to safety hazards. For example, the sudden sliding of the steel pipe during cutting may injure the operator. Many existing devices rely on manual operation to adjust the position of the steel pipe and control the clamping degree, which means that a large amount of time is required for preparation work for each cutting, and these operations often require a high skill level to ensure accuracy. The complex operation process increases the labor intensity and also limits the production efficiency. Especially in a large-scale production environment, this manual operation mode is obviously not efficient enough. Therefore, it is necessary to propose a solution to this technical problem. Summary of the Invention
[0003] (1) Technical Problems to be Solved
[0004] In view of the deficiencies of the prior art, the present invention provides a steel pipe cutting device based on ship processing.
[0005] (2) Technical Solutions
[0006] To achieve the above object, the present invention provides the following technical solution: A steel pipe cutting device based on ship processing, including a workbench, a cutting mechanism and a clamping mechanism are provided on the workbench. The clamping mechanism includes an adjustment box. A linear movement mechanism is provided between the adjustment box and the workbench. An adjustment motor is provided inside the adjustment box. An adjustment column is provided at the output end of the adjustment motor. A bearing seat is provided between the adjustment column and the adjustment box. A fixing plate is provided at the top of the adjustment column. A clamping device is provided on the fixing plate. A support plate is provided on one side of the adjustment column. A horizontal adjustment plate is provided on the support plate. A splicing mechanism is provided between the support plate and the horizontal adjustment plate. A vertical adjustment plate is provided on one side of the fixing plate. T-shaped grooves are provided on both the horizontal adjustment plate and the vertical adjustment plate. An iron plate is provided at the bottom end of the T-shaped groove. A T-shaped block is provided on the T-shaped groove. A limiting plate is provided at the top end of the T-shaped block. An electromagnet is provided at the bottom end of the T-shaped block. The electromagnet is embedded at the bottom end of the T-shaped block. There are two T-shaped blocks and they are symmetrically arranged.
[0007] Further, the present invention is improved in that the splicing mechanism includes a splicing groove and a splicing block. The splicing groove is opened at the top end of one side of the support plate. The splicing block is installed at one side of the horizontal adjustment plate. The splicing block abuts against the splicing groove. Both the splicing block and the splicing groove are in a T-shaped structure.
[0008] Further, the present invention is improved in that the clamping device includes a driving motor, a clamping groove and a lifting plate. The driving motor is installed at the bottom end of the fixing plate. The output end of the driving motor extends to the top end of the fixing plate. A bearing is provided between the output end of the driving motor and the fixing plate. A lead screw is provided at the output end of the driving motor. A lifting guiding mechanism is provided between the lifting plate and the fixing plate. A threaded hole is opened on the lifting plate. The lead screw passes through the threaded hole. The clamping groove is opened at the bottom end of the lifting plate and the top end of the fixing plate.
[0009] Further, the present invention is improved in that the lifting guiding mechanism includes a guiding rod and a guiding hole. The guiding rod is installed at the top end of the fixing plate. The guiding hole is opened on the lifting plate. The guiding rod passes through the guiding hole.
[0010] Further, the present invention is improved in that the linear movement mechanism includes a telescopic device. The telescopic device is installed at the top end of the workbench. The output end of the telescopic device is connected to the adjustment box.
[0011] Furthermore, the present invention is improved in that the cutting mechanism includes a cutting motor and a cutting frame. The cutting frame is installed on the workbench. An elevating mechanism is provided on the cutting frame. A protective shell is provided at the output end of the elevating mechanism. The cutting motor is installed on the protective shell. A cutting blade is provided between the output end of the cutting motor and the protective shell.
[0012] Furthermore, the present invention is improved in that both the telescopic device and the telescopic mechanism are electric telescopic rods or pneumatic telescopic rods.
[0013] Furthermore, the present invention is improved in that a slag discharge port is opened at the top end of the workbench, and the slag discharge port is located below the cutting blade.
[0014] (III) Beneficial Effects
[0015] Compared with the prior art, the present invention provides a steel pipe cutting device based on ship processing, which has the following beneficial effects:
[0016] For the steel pipe cutting device based on ship processing, by adjusting the motor to drive the adjusting column to rotate and combining with the linear movement mechanism to adjust the position of the steel pipe, accurate positioning and cutting of steel pipes with different diameters and shapes can be achieved. Especially for steel pipes with a 90-degree bend, vertical or horizontal inclined cutting can be flexibly carried out, greatly improving the cutting flexibility and application range, reducing the need to replace equipment to adapt to different cutting tasks, thus saving time and cost. The design of using an electromagnet to adsorb the T-shaped block to fix the limiting plate ensures the stability of the steel pipe during inclined cutting. At the same time, the clamping device uses a driving motor to control the rotation of the lead screw to precisely adjust the clamping force, which not only improves the stability during the cutting process, reduces the safety hazards caused by the sliding of the steel pipe, but also ensures the consistency of the cutting quality and reduces the rejection rate. The automated clamping device enables the clamping and loosening operations of the steel pipe to be completed without manual intervention, and only the driving motor needs to be controlled; in addition, the application of electric or pneumatic telescopic rods also simplifies the operation process of the linear movement mechanism, greatly reducing the labor intensity and improving the work efficiency, which is especially suitable for large-scale production environments that require frequent adjustment of cutting parameters and helps to improve the overall productivity;
[0017] The T-shaped splicing mechanism allows the transverse adjusting plate to be quickly and stably assembled onto the support plate, shortening the equipment preparation time, improving the operation convenience and response speed, making the entire cutting process more smooth and efficient, and meeting the requirements of modern manufacturing for efficiency and precision. Description of the Drawings
[0018] Figure 1 Structural schematic of the present invention Figure 1 ;
[0019] Figure 2 Structural schematic of the present inventionFigure 2 ;
[0020] Figure 3 For the enlarged front half-sectional view of the adjustment box in the present invention Figure 1 ;
[0021] Figure 4 For the enlarged left half-sectional view of the adjustment box in the present invention Figure 1 ;
[0022] Figure 5 For the enlarged right half-sectional view of the horizontal adjustment plate in the present invention Figure 1 ;
[0023] In the figure: 1, workbench; 2, adjustment box; 3, adjustment motor; 4, adjustment column; 5, bearing seat; 6, fixed plate; 7, support plate; 8, horizontal adjustment plate; 9, vertical adjustment plate; 10, T-shaped groove; 11, iron plate; 12, T-shaped block; 13, limit plate; 14, electromagnet; 15, splicing block; 16, drive motor; 17, clamping groove; 18, lifting plate; 19, lead screw; 20, guide rod; 21, telescopic device; 22, cutting motor; 23, cutting frame; 24, lifting mechanism; 25, protective shell; 26, cutting blade; 27, slag discharge port. Specific embodiments
[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0025] Please refer to Figure 1-5, the present invention is a steel pipe cutting device based on ship processing, including a workbench 1. A cutting mechanism and a clamping mechanism are provided on the workbench 1. The clamping mechanism includes an adjustment box 2. A linear movement mechanism is provided between the adjustment box 2 and the workbench 1. An adjustment motor 3 is provided inside the adjustment box 2. An adjustment column 4 is provided at the output end of the adjustment motor 3. A bearing seat 5 is provided between the adjustment column 4 and the adjustment box 2. A fixing plate 6 is provided at the top of the adjustment column 4. A clamping device is provided on the fixing plate 6. A support plate 7 is provided on one side of the adjustment column 4. A horizontal adjustment plate 8 is provided on the support plate 7. A splicing mechanism is provided between the support plate 7 and the horizontal adjustment plate 8. A vertical adjustment plate 9 is provided on one side of the fixing plate 6. T-shaped grooves 10 are provided on both the horizontal adjustment plate 8 and the vertical adjustment plate 9. An iron plate 11 is provided at the bottom end of the T-shaped groove 10. T-shaped blocks 12 are provided on the T-shaped groove 10. A limiting plate 13 is provided at the top end of the T-shaped block 12. An electromagnet 14 is provided at the bottom end of the T-shaped block 12. The electromagnet 14 is embedded at the bottom end of the T-shaped block 12. Two T-shaped blocks 12 are provided and are symmetrically arranged. In this embodiment, the steel pipe required for ship processing is placed on the clamping device, and then the steel pipe is clamped by using the clamping device. The adjustment column 4 is rotated by the output end of the adjustment motor 3. The adjustment column 4 stably rotates the angle through the bearing seat 5, so as to realize the adjustment of the cutting angle of the steel pipe. Then, the adjustment box 2 is linearly moved by using the linear movement mechanism, so that the steel pipe approaches the cutting mechanism. Then, the steel pipe is cut by the cutting mechanism. When performing a vertical inclined plane cutting on a 90-degree bent steel pipe, the two T-shaped blocks 12 on the vertical adjustment plate 9 are taken out, and then the horizontal adjustment plate 8 is assembled on the support plate 7 through the splicing mechanism. The two T-shaped blocks 12 are placed in the T-shaped grooves 10 of the horizontal adjustment plate 8. Then, the steel pipe that needs to be vertically inclined plane cut is vertically placed on the clamping device. Then, the two limiting plates 13 are abutted against both sides of the vertically placed steel pipe. After the angle of the steel pipe is adjusted to 90 degrees by a personnel measuring tool, the electromagnets 14 on the two T-shaped blocks 12 are turned on. The electromagnets 14 adsorb the iron plate 11 on the T-shaped groove 10, so that the limiting plate 13 is fixed in position, ensuring the vertical stability of the steel pipe. Then, the clamping operation is performed by the clamping device. The angle of the fixing plate 6 is rotated by the output end of the adjustment motor 3, so as to realize the vertical inclined plane cutting operation on the 90-degree bent steel pipe. By the two limiting plates 13 limiting and abutting against the steel pipe, the stability of the inclined plane cutting of the steel pipe can be ensured. When performing a horizontal inclined plane cutting on a 90-degree steel pipe, the horizontal adjustment plate 8 is taken out from the support plate 7 through the splicing mechanism. Then, the two T-shaped blocks 12 are put into the T-shaped grooves 10 of the vertical adjustment plate 9. The steel pipe that needs to be horizontally inclined plane cut is vertically placed on the clamping device. Then, the two limiting plates 13 are abutted against both sides of the horizontally placed steel pipe. After the angle of the steel pipe is adjusted to the horizontal angle by a personnel measuring tool, the electromagnets 14 on the two T-shaped blocks 12 are turned on,The electromagnet 14 absorbs the iron plate 11 on the T-slot 10, so that the position of the limit plate 13 is fixed to ensure the vertical stability of the steel pipe. Then the clamping device performs the clamping operation, and the angle of the rotating fixed plate 6 is adjusted by the output end of the motor 3, so as to realize the transverse bevel cutting operation of the steel pipe bent at 90 degrees. This structure can not only cut normal steel pipes, but also cut one end of the steel pipe bent at 90 degrees, and can adjust the angle of the steel pipe, so as to realize the cutting operation of the steel pipe at different angles.
[0026] In order to solve the problem of quick assembly and stable connection of the transverse adjustment plate, in the present solution, the splicing mechanism includes a splicing groove and a splicing block 15. The splicing groove is opened at the top of one side of the support plate 7, and the splicing block 15 is installed on one side of the transverse adjustment plate 8. The splicing block 15 is against the splicing groove. The splicing block 15 and the splicing groove are both T-shaped structures. When the transverse adjustment plate 8 needs to be assembled on the support plate 7, the splicing block 15 is aligned and inserted into the splicing groove, so that the transverse adjustment plate 8 is assembled on one side of the support plate 7. The splicing block 15 and the splicing groove with a T-shaped structure can prevent the splicing block 15 from detaching from the splicing groove, and the transverse adjustment plate 8 can be quickly assembled only by insertion.
[0027] In order to realize automatic clamping and loosening of the steel pipe, in this scheme, the clamping device includes a driving motor 16, a clamping groove 17 and a lifting plate 18, the driving motor 16 is installed at the bottom end of the fixed plate 6, the output end of the driving motor 16 extends to the top of the fixed plate 6, a bearing is provided between the output end of the driving motor 16 and the fixed plate 6, a screw rod 19 is provided at the output end of the driving motor 16, a lifting guide mechanism is provided between the lifting plate 18 and the fixed plate 6, a threaded hole is provided on the lifting plate 18, the screw rod 19 passes through the threaded hole, and the clamping groove 17 is provided at the bottom end of the lifting plate 18 And the top end of the fixed plate 6, by controlling the output end of the drive motor 16 to rotate the screw rod 19, the output end of the drive motor 16 can be stably rotated on the fixed plate 6 through the bearing, and the screw rod 19 passes through the threaded hole of the lifting plate 18, so that the lifting plate 18 can be stably lifted and lowered in a straight line through the screw rod 19 and the lifting guide mechanism, so that the lifting plate 18 can move downward and clamp the steel pipe located in the clamping groove 17 on the fixed plate 6 through the clamping groove 17, and the output end of the drive motor 16 is controlled to rotate in the opposite direction, so that the lifting plate 18 can be moved upward, which is convenient for taking out the steel pipe, and the steel pipe can be automatically clamped and released.
[0028] The above-mentioned lifting and guiding mechanism can be any kind of guiding device. In order to improve the stability of the lifting movement of the lifting plate, in this solution, the lifting and guiding mechanism includes a guiding rod 20 and a guiding hole. The guiding rod 20 is installed at the top of the fixing plate 6, and the guiding hole is opened on the lifting plate 18. The guiding rod 20 passes through the guiding hole. By installing the guiding rod 20 on the fixing plate 6 to pass through the guiding hole of the lifting plate 18, the lifting plate 18 can be stably lifted and lowered linearly through the guiding rod 20 and the lead screw 19.
[0029] In order to improve the precise linear movement of the adjustment box and the steel pipe on the workbench, in this solution, the linear movement mechanism includes a telescopic device 21. The telescopic device 21 is installed at the top of the workbench 1, and the output end of the telescopic device 21 is connected to the adjustment box 2. By controlling the telescopic device 21 to linearly move the adjustment box 2 on the workbench 1, it is convenient to drive the clamped steel pipe to move linearly on the workbench 1, facilitating the cutting operation.
[0030] In order to ensure the safety and efficiency during the cutting process, in this solution, the cutting mechanism includes a cutting motor 22 and a cutting frame 23. The cutting frame 23 is installed on the workbench 1, and a lifting mechanism 24 is provided on the cutting frame 23. A protective shell 25 is provided at the output end of the lifting mechanism 24. The cutting motor 22 is installed on the protective shell 25, and a cutting blade 26 is provided between the output end of the cutting motor 22 and the protective shell 25. By controlling the lifting mechanism 24, it is convenient to lift and lower the cutting blade 26. By turning on the cutting motor 22, the cutting blade 26 can be rotated to cut the steel pipe below, and the protective shell 25 can reduce the splashing of chips during the cutting process.
[0031] In order to ensure the accuracy of the linear movement and cutting action, in this solution, both the telescopic device 21 and the telescopic mechanism are electric telescopic rods or pneumatic telescopic rods. Electric telescopic rods or pneumatic telescopic rods can play a role in stable and high-precision linear control in this structure.
[0032] In order to solve the problem of inconvenient cleaning of cutting waste and debris, in this solution, a slag discharge port 27 is opened at the top of the workbench 1. The slag discharge port 27 is located below the cutting blade 26. By having the slag discharge port 27 located below the cutting blade 26, most of the chips generated during cutting can be discharged, facilitating the cleaning of the slag.
[0033] Place this structure on a stable working area and check whether all components are firmly installed. Ensure that the power supply is normal, turn on the main power supply of the device and start the control system. Prepare the steel pipe to be cut, such as a carbon steel pipe with a diameter of 50 mm and a wall thickness of 5 mm, and place it in the clamping groove 17 on the fixed plate 6. Start the drive motor 16, drive the lifting plate 18 to move downward through the lead screw 19, and clamp the steel pipe in the clamping groove 17. If it is necessary to cut a steel pipe bent at 90 degrees, select a suitable adjusting plate according to the cutting direction, take out the two T-shaped blocks 12 on the vertical adjusting plate 9, install the horizontal adjusting plate 8 on the support plate 7 through the splicing mechanism, and reinsert the T-shaped blocks 12 into the T-shaped grooves 10 of the horizontal adjusting plate 8. Conversely, remove the horizontal adjusting plate 8 and use the vertical adjusting plate 9 for fixation. According to the cutting requirements, start the adjusting motor 3 and rotate the adjusting column 4 to adjust the angle of the fixed plate 6. For example, if it is necessary to cut a 45° inclined plane, adjust the fixed plate 6 to the corresponding angle and lock the position through the limit plate 13. Turn on the electromagnet 14 on the T-shaped block 12 to adsorb the iron plate 11 in the T-shaped groove 10, ensure that the limit plate 13 fixes the steel pipe, and ensure the stability during the cutting process. Control the linear movement mechanism, push the adjusting box 2 to move along the workbench 1, make the steel pipe close to the cutting blade 26, start the cutting motor 22, adjust the lifting mechanism 24 to lower the cutting blade 26 to the surface of the steel pipe, and start the cutting operation. During the cutting process, the debris falls into the collection container below through the slag discharge port 27 to keep the working area clean. After the cutting is completed, turn off the cutting motor 22 and lift the cutting blade 26 to a safe height. Reverse-start the drive motor 16 to release the clamping device, take out the cut steel pipe, clean the working area, check the equipment status, and prepare for the next cutting task. In the hull frame structure, precise cutting of straight pipes and steel pipes bent at 90 degrees can meet the requirements of different welding parts, can cut inclined planes at specific angles for connecting complex hydraulic or pneumatic pipelines, quickly adjust the cutting angle according to special requirements, and achieve high-efficiency production in small batches and multiple varieties. The entire cutting process only takes 10 minutes including preparation and cleaning time, which is more than 50% shorter than the traditional method. The cutting angle error is controlled within ±0.5°, meeting the high-precision processing requirements. Through the automatic clamping and limiting devices, the safety hazards caused by the sliding of the steel pipe are avoided.
[0034] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made in these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A steel pipe cutting device based on ship processing, comprising a workbench (1), wherein the workbench (1) is provided with a cutting mechanism and a clamping mechanism, characterized in that: The clamping mechanism comprises an adjustment box (2), a linear moving mechanism is provided between the adjustment box (2) and the workbench (1), an adjustment motor (3) is provided inside the adjustment box (2), an adjustment column (4) is provided at the output end of the adjustment motor (3), a bearing seat (5) is provided between the adjustment column (4) and the adjustment box (2), a fixing plate (6) is provided at the top end of the adjustment column (4), a clamping device is provided on the fixing plate (6), a support plate (7) is provided on one side of the adjustment column (4), a lateral adjustment plate (8) is provided on the support plate (7), and the support plate (7) and the adjustment box (2) are connected to each other. A splicing mechanism is provided between the transverse adjustment plates (8), a vertical adjustment plate (9) is provided on one side of the fixed plate (6), a T-shaped slot (10) is provided on the transverse adjustment plate (8) and the vertical adjustment plate (9), an iron plate (11) is provided at the bottom end of the T-shaped slot (10), a T-shaped block (12) is provided on the T-shaped slot (10), a limiting plate (13) is provided at the top end of the T-shaped block (12), an electromagnet (14) is provided at the bottom end of the T-shaped block (12), and the electromagnet (14) is embedded in the bottom end of the T-shaped block (12), and two T-shaped blocks (12) are provided and symmetrically arranged.
2. A steel pipe cutting device based on ship processing according to claim 1, characterized in that: The splicing mechanism comprises a splicing groove and a splicing block (15); the splicing groove is arranged at the top end of one side of the support plate (7); the splicing block (15) is installed on one side of the transverse adjustment plate (8); the splicing block (15) abuts against the splicing groove; the splicing block (15) and the splicing groove both present a T-shaped structure.
3. A steel pipe cutting device based on ship processing according to claim 2, characterized in that: The clamping device comprises a driving motor (16), a clamping groove (17) and a lifting plate (18); the driving motor (16) is mounted at the bottom end of the fixed plate (6); the output end of the driving motor (16) extends to the top end of the fixed plate (6); a bearing is provided between the output end of the driving motor (16) and the fixed plate (6); a screw rod (19) is provided at the output end of the driving motor (16); a lifting guide mechanism is provided between the lifting plate (18) and the fixed plate (6); a threaded hole is provided on the lifting plate (18); the screw rod (19) passes through the threaded hole; the clamping groove (17) is provided at the bottom end of the lifting plate (18) and the top end of the fixed plate (6).
4. A steel pipe cutting device based on ship processing according to claim 3, characterized in that: The lifting guide mechanism comprises a guide rod (20) and a guide hole, wherein the guide rod (20) is mounted on the top end of the fixing plate (6), the guide hole is opened on the lifting plate (18), and the guide rod (20) passes through the guide hole.
5. The steel pipe cutting device based on ship processing according to claim 4 is characterized in that: The linear moving mechanism comprises a telescopic device (21), wherein the telescopic device (21) is installed on the top of the workbench (1), and the output end of the telescopic device (21) is connected to the regulating box (2).
6. A steel pipe cutting device based on ship processing according to claim 5, characterized in that: The cutting mechanism comprises a cutting motor (22) and a cutting frame (23); the cutting frame (23) is mounted on the workbench (1); a lifting mechanism (24) is provided on the cutting frame (23); a protective shell (25) is provided at the output end of the lifting mechanism (24); the cutting motor (22) is mounted on the protective shell (25); and a cutting blade (26) is provided between the output end of the cutting motor (22) and the protective shell (25).
7. A steel pipe cutting device based on ship processing according to claim 6, characterized in that: The telescopic device (21) and the telescopic mechanism are both electric telescopic rods or pneumatic telescopic rods.
8. The steel pipe cutting device based on ship processing according to claim 7, characterized in that: A slag discharge port (27) is provided at the top of the workbench (1), and the slag discharge port (27) is located below the cutting blade (26).