Pipe network construction grooving device
By designing a grooved device for pipeline construction, using the first blade and wind technology, the problems of land damage and slope collapse during the trough construction in pipeline construction are solved, and efficient and environmentally friendly grooved operation is achieved.
Patent Information
- Application Number
- CN202421292103.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-06
- Publication Date
- 2025-02-28
- Estimated Expiration
- 2034-06-06
AI Technical Summary
During the troughing process during pipeline construction, excavators lead to excessive damage to the land, landslides collapse, environmental damage, and difficulty in troughing hard soil and low efficiency.
A pipe network construction groove device is designed, including a grooved plate, a first slide groove, a slide rod, a first blade and an air intake pipe exhaust hole and other components. The first blade is inserted into multiple points in the soil, and the soil is loosened by wind force, so as to achieve soil loosening and rapid cutting, reducing slope collapse and environmental damage.
Effectively break the soil slab, evenly and finely trough, maintain the soil structure, reduce slope collapse, protect the environment, improve trough efficiency, and reduce the difficulty of troughing hard soil.
Smart Images
Figure CN222541557U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of pipe network construction, in particular to a pipe network construction slotting device. Background Art
[0002] Pipeline network construction refers to the construction of pipeline systems to meet urban water supply, drainage, gas and other needs. Pipeline network construction is a more important part of water conservancy project construction.
[0003] Trenching is a key construction step in pipeline construction, which requires necessary surveys of the surrounding environment, clearing of obstacles on the ground, excavation of earth using excavators and other equipment, trenching according to predetermined markings, and controlling the depth of the trench.
[0004] During the trenching process of the pipeline network, an excavator is usually used for trenching work, which can easily cause excessive damage to the land, leading to collapse of the trench slope and damage to the surrounding environment.
[0005] To this end, the utility model provides a grooving device for pipe network construction. Utility Model Content
[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.
[0007] The technical solution adopted by the utility model to solve its technical problems is: a pipeline construction grooving device described in the utility model comprises a grooving plate; a through groove is opened in the middle of the grooving plate; a plurality of first slide grooves are opened in the middle of the grooving plate; the plurality of first slide grooves are arranged at both sides of the grooving plate; the first slide groove is inclined; two slide rods are slidably connected in the middle of the first slide groove; the two slide rods are arranged oppositely; the ends of the two slide rods are fixedly connected to a support plate; the other ends of the two slide rods are fixedly connected to a connecting plate; the bottom of the connecting plate is fixedly connected to a first blade; by inserting the first blade, multiple points of the soil can be subjected to force, the soil can be loosened, thereby effectively breaking the soil compaction, effectively and quickly cutting the soil to form the required grooves, evenly and finely grooving the soil, and effectively maintaining the structure of the soil, effectively causing excessive damage to the soil, effectively reducing the problem of landslides on the groove slope, effectively protecting the surrounding environment from damage, and effectively reducing the problem of difficulty in grooving hard soil, effectively improving the efficiency of pipeline grooving work.
[0008] Preferably, an air inlet pipe is fixedly connected to the middle part of one of the sliding bars; the end of the air inlet pipe passes through the middle part of the support plate; the other end of the air inlet pipe passes through the top of the connecting plate; an exhaust groove is provided in the middle part of the connecting plate; and a plurality of exhaust holes are provided on the side wall of the connecting plate; by blowing air into the soil, the wind force can be used to further loosen the soil, effectively making the arrangement between the soil particles looser, effectively reducing the resistance during grooving, effectively reducing the waste of time and manpower caused by soil compaction or compaction, making it easier to groove the soil, and effectively improving the efficiency and speed of grooving.
[0009] Preferably, two fixed cones are fixedly connected to the bottom of the slotted plate; the two fixed cones are arranged opposite to each other; two hinge shafts are fixedly connected to the middle of the fixed cone; the two hinge shafts are arranged opposite to each other; a gripping plate is fixedly connected to the middle of the hinge shaft; the gripping plate is arranged in an arc shape; a positioning plate is fixedly connected to the middle of the hinge shaft; the positioning plate is arranged in an arc shape; the fixed cones can provide strong supporting force for the slotted plate, effectively enabling the slotted plate to remain stable, and the position of the fixed cones in the soil is locked by the hinge shaft, effectively reducing the shaking of the slotted plate during the slotting process, and can effectively enhance the overall stability, making the installation process simple and fast, and can adapt to various terrains and soil conditions, effectively improving the efficiency of the slotting work of the slotted plate.
[0010] Preferably, the side walls of the two sliding rods are fixed with a mesh plate; one end of the mesh plate is fixed to the bottom of the support plate; the other end of the mesh plate is fixed to the top of the connecting plate; the mesh plate can effectively reduce the compaction and damage to the soil during grooving, reduce the mixing of stones and plant roots in the soil into the grooved soil, effectively reduce the difficulty and time of cleaning work caused by the mixing of debris, effectively improve the quality and efficiency of grooving, can effectively reduce the loss of soil due to disturbance, and effectively maintain the stability of the grooving area.
[0011] Preferably, multiple groups of second slide grooves are fixedly connected to the bottom of the slotted plate; every two second slide grooves form a group; each group of second slide grooves is opened on both sides of multiple groups of first slide grooves; the second slide grooves are inclined; a protective plate is slidably connected to the middle of the second slide groove; multiple groups of springs are fixedly connected to the middle of the protective plate; the ends of multiple groups of springs are fixedly connected to the top position of the second slide groove; the protective plate can effectively protect the first blade when it is not working, can effectively reduce the first blade being exposed to the outside and causing damage during storage or movement, and can effectively reduce the problem of wear and damage caused by direct contact between the first blade and hard objects, can effectively keep the first blade at its best performance, and effectively improve work efficiency and safety.
[0012] Preferably, an elastic scraper is fixedly connected to the bottom of the protective plate; the elastic scraper is arranged at an angle; the elastic scraper is arranged flexibly; the first blade can be effectively cleaned by the elastic scraper, which can effectively reduce the problem of decreased efficiency when the soil adhering to the first blade is used for the next grooving, and can effectively reduce the wear of the surface caused by sand and stones in the soil, which can effectively reduce the decrease in sharpness of the first blade, effectively increase the service life of the first blade, and effectively reduce the resistance of the first blade during the grooving process, thereby improving the efficiency of the grooving work.
[0013] Preferably, multiple groups of second blades are fixed to the bottom of the slotting plate; each two second blades form a group; the two second blades are fixed to the positions on both sides of the corresponding first slide groove; the second blades are arranged at an angle; the plant roots and stems wrapped around the middle of the mesh plate can be effectively cleaned through the elastic scraper, effectively reducing the damage caused by the roots and stems wrapped around the mesh plate, reducing the risk of injury caused by direct contact with the plant roots and stems, and effectively reducing the problem of difficulty in the next slotting caused by the plant roots and stems in the middle of the mesh plate.
[0014] Preferably, a filter is installed in the middle of the exhaust hole; the filter is fixedly connected to the middle of the exhaust hole; the filter can effectively reduce the soil from entering the connecting plate through multiple sets of exhaust holes during the grooving process, can effectively reduce the accumulation of soil after entering the connecting plate, effectively reduce the blockage inside the connecting plate, and can reduce the problem of soil entering the connecting plate that is difficult to clean, effectively allowing the airflow to flow smoothly, and effectively improving the working efficiency of blowing.
[0015] The beneficial effects of the utility model are as follows:
[0016] 1. The utility model discloses a grooving device for pipe network construction, which can loosen the soil and effectively break up soil compaction by inserting a first blade so that multiple points of the soil are acted upon by force, and can effectively and quickly cut the soil to form the required grooves, can evenly and finely groove the soil, and can effectively maintain the structure of the soil, effectively causing excessive damage to the soil, and can effectively reduce the difficulty of grooving hard soil.
[0017] 2. The utility model discloses a grooving device for pipe network construction, which can utilize wind force to further loosen the soil by blowing air into the soil, effectively making the arrangement between soil particles looser, effectively reducing the resistance encountered during grooving, and effectively reducing the waste of time and manpower caused by soil compaction or compaction. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The utility model will be further described below in conjunction with the accompanying drawings.
[0019] Figure 1 It is a three-dimensional diagram of a grooving device for pipe network construction in the utility model;
[0020] Figure 2 It is a structural schematic diagram of the exhaust groove in the utility model;
[0021] Figure 3 It is a structural schematic diagram of the gripping floor in the utility model;
[0022] Figure 4 It is a structural schematic diagram of the protective plate in the utility model;
[0023] In the figure: 1. slotted plate; 10. through slot; 11. first slide slot; 12. slide rod; 13. support plate; 14. connecting plate; 15. first blade; 2. air inlet pipe; 21. exhaust slot; 22. exhaust hole; 3. fixed cone; 31. hinge shaft; 32. gripping plate; 33. positioning plate; 4. mesh plate; 5. second slide slot; 51. protective plate; 52. spring; 6. elastic scraper; 7. second blade; 8. filter. DETAILED DESCRIPTION
[0024] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.
[0025] like Figure 1 and Figure 2As shown, a grooving device for pipe network construction described in an embodiment of the utility model comprises a grooving plate 1; a through groove 10 is formed in the middle of the grooving plate 1; a plurality of first slide grooves 11 are formed in the middle of the grooving plate 1; a plurality of first slide grooves 11 are arranged at both sides of the grooving plate 1; a plurality of first slide grooves 11 are arranged oppositely; the first slide grooves 11 are arranged obliquely; two slide bars 12 are slidably connected to the middle of the first slide groove 11; the two slide bars 12 are arranged oppositely; the ends of the two slide bars 12 are fixedly connected to a support plate 13; the support plate 13 is fixedly connected to the top position of the grooving plate 1; the other ends of the two slide bars 12 are fixedly connected to a connecting plate 14; a first blade 15 is fixedly connected to the bottom of the connecting plate 14; when working, the grooving plate 1 is placed at the position where grooving is required, the support plate 13 is pressed downward, so that the two slide bars 12 slide inside the first slide groove 11, and when the first blade 15 moves inside the soil, the first blade 15 is moved by the first blade The end of the blade 15 cuts off the plant roots in the soil, and the internal soil is loosened by multiple groups of first blades 15, and grooves in designated areas are opened, and then the soil between the multiple groups of first blades 15 is discharged, and the grooved plate 1 is taken out and the support plate 13 is pulled out, so that the first blade 15 returns to the bottom of the grooved plate 1, and then enters the next area for grooved. By inserting the first blade 15, multiple points of the soil can be subjected to force, which can loosen the soil and effectively break the soil compaction, effectively and quickly cut the soil to form the required grooves, evenly and finely groove the soil, and effectively maintain the structure of the soil, effectively cause excessive damage to the soil, effectively reduce the problem of landslides on the groove slopes, effectively protect the surrounding environment from being destroyed, and effectively reduce the problem of difficulty in grooving hard soils, effectively improve the efficiency of pipeline grooving work.
[0026] like Figure 1 and Figure 2 As shown, an air inlet pipe 2 is fixedly connected to the middle part of one of the slide bars 12; the end of the air inlet pipe 2 passes through the middle part of the support plate 13; the other end of the air inlet pipe 2 passes through the top of the connecting plate 14; an exhaust groove 21 is opened in the middle part of the connecting plate 14; a plurality of exhaust holes 22 are opened on the side wall of the connecting plate 14; a plurality of exhaust holes 22 are opened on both sides of the connecting plate 14; a plurality of exhaust holes 22 are evenly distributed on the side wall of the connecting plate 14; when working, one end of the air inlet pipe 2 is connected to the exhaust device, and the airflow is discharged into the air inlet pipe 2 so that the airflow enters the exhaust groove 21 from the end of the air inlet pipe 2, and then the airflow is discharged through the plurality of exhaust holes 22 and blown into the loosened soil. By blowing air into the soil, the wind force can be used to further loosen the soil, effectively making the arrangement between the soil particles looser, effectively reducing the resistance during grooving, effectively reducing the waste of time and manpower caused by soil compaction or compaction, making it easier to grooving the soil, and effectively improving the efficiency and speed of grooving.
[0027] like Figure 1 , Figure 3 , Figure 4 As shown, two fixed cones 3 are fixedly connected to the bottom of the slotted plate 1; the two fixed cones 3 are arranged oppositely; two hinge shafts 31 are fixedly connected to the middle of the fixed cone 3; the two hinge shafts 31 are arranged oppositely; a gripping plate 32 is fixedly connected to the middle of the hinge shaft 31; the gripping plate 32 is arranged in an arc shape; a positioning plate 33 is fixedly connected to the middle of the hinge shaft 31; the positioning plate 33 is arranged in an arc shape; the positioning plate 33 is arranged at the bottom of the gripping plate 32; when working, the slotted plate 1 is placed on the ground in a designated area, at this time, the fixed cone 3 enters the soil from the bottom, and when the fixed cone 3 moves downward, the gripping plate 32 is squeezed by the soil and approaches the fixed cone 3 through the hinge shaft 31. Because the gripping plate 32 is arranged in an arc shape, the soil will still enter the gripping plate When soil enters between the gripping plate 32 and the fixed cone 3, the gripping plate 32 is submerged in the soil and rotates downward. During the rotation of the gripping plate 32, the end of the positioning plate 33 contacts the fixed cone 3, and the gripping plate 32 is stopped at a specified position through the positioning plate 33. The fixed cone 3 can provide a strong supporting force for the slotted plate 1, effectively allowing the slotted plate 1 to remain stable, and the position of the fixed cone 3 in the soil is locked by the hinge shaft 31, effectively reducing the shaking of the slotted plate 1 during the slotting process, and can effectively enhance the overall stability, making the installation process simple and fast, and can adapt to various terrains and soil conditions, effectively improving the efficiency of the slotting work of the slotted plate 1.
[0028] like Figure 1 and Figure 2 As shown, the side walls of the two slide bars 12 are fixedly connected with a mesh plate 4; one end of the mesh plate 4 is fixedly connected to the bottom of the support plate 13; the other end of the mesh plate 4 is fixedly connected to the top of the connecting plate 14; during operation, when the first blade 15 enters the soil, the soil between the two slide bars 12 is separated by the mesh plate 4, and the soil in the grooved area is blocked. The mesh plate 4 can effectively reduce the compaction and damage of the soil during grooved, reduce the mixing of stones and plant roots in the soil into the grooved soil, effectively reduce the difficulty and time of cleaning work caused by the mixing of debris, effectively improve the quality and efficiency of grooved, can effectively reduce the loss of soil due to disturbance, and effectively maintain the stability of the grooved area.
[0029] like Figure 4As shown, multiple groups of second slide grooves 5 are fixedly connected to the bottom of the slotted plate 1; every two second slide grooves 5 form a group; each group of second slide grooves 5 is opened on both sides of multiple groups of first slide grooves 11; the second slide grooves 5 are inclined; a protective plate 51 is slidably connected to the middle of the second slide groove 5; multiple groups of springs 52 are fixedly connected to the middle of the protective plate 51; the ends of multiple groups of springs 52 are fixedly connected to the top position of the second slide groove 5; multiple groups of springs 52 are equidistantly distributed in the middle of the protective plate 51; when the slotted plate 1 is placed on the ground during operation, the end of the protective plate 51 first contacts the ground, and shrinks toward the inside of the second slide groove 5 as the slotted plate 1 moves, so that the slotted plate 1 The slot plate 1 fits in with the ground. When the slotting is completed and the slotting plate 1 is picked up, the protective plate 51 slides outwards through the elasticity of the spring 52, and the first blade 15 is protected when the first blade 15 moves to the bottom position of the slotting plate 1. The protective plate 51 can effectively protect the first blade 15 when it is not working, and can effectively reduce the first blade 15 being exposed to the outside and causing damage during storage or movement, and can effectively reduce the problem of wear and damage caused by direct contact between the first blade 15 and hard objects, which can effectively keep the first blade 15 at its best performance and effectively improve work efficiency and safety.
[0030] like Figure 4 As shown, an elastic scraper 6 is fixedly connected to the bottom of the protective plate 51; the two elastic scrapers 6 are arranged opposite to each other; the elastic scraper 6 is arranged inclined; the elastic scraper 6 is flexibly arranged; when working, when the first blade 15 slides through the two sliding rods 12, the end of the elastic scraper 6 contacts the two sides of the first blade 15 and generates elasticity along with the surface of the first blade 15, and the soil adhered to the surface of the first blade 15 is scraped off. The first blade 15 can be effectively cleaned by the elastic scraper 6, which can effectively reduce the problem of decreased efficiency when the soil adhered to the first blade 15 is used for the next grooving, and can effectively reduce the wear of the surface caused by sand and stones in the soil, which can effectively reduce the decrease in sharpness of the first blade 15, effectively increase the service life of the first blade 15, and effectively reduce the resistance of the first blade 15 during the grooving process, thereby improving the efficiency of the grooving work.
[0031] like Figure 4 As shown, multiple groups of second blades 7 are fixedly connected to the bottom of the slotting plate 1; every two second blades 7 form a group; each group of second blades 7 are arranged oppositely; two second blades 7 are fixedly connected to the positions on both sides of the corresponding first slide groove 11; the second blades 7 are arranged obliquely; during operation, after the slotting is completed, the support plate 13 is pulled upward, and the plant roots and stems wrapped around the middle of the mesh plate 4 are cut off and removed by the second blade 7, and the plant roots and stems wrapped around the middle of the mesh plate 4 can be effectively cleaned by the elastic scraper 6, effectively reducing the damage caused by the roots and stems wrapped around the mesh plate 4, reducing the risk of injury caused by direct contact with the plant roots and stems, and effectively reducing the problem of plant roots and stems in the middle of the mesh plate 4 causing difficulty in the next slotting.
[0032] like Figure 2 As shown, a filter screen 8 is installed in the middle of the exhaust hole 22; the filter screen 8 is fixedly connected to the middle of the exhaust hole 22; during operation, when the first blade 15 enters the soil to make a groove, the soil is isolated by the filter screen 8, and the filter screen 8 can effectively reduce the soil from entering the connecting plate 14 through the multiple sets of exhaust holes 22 during the groove making process, and can effectively reduce the accumulation problem of soil entering the connecting plate 14, effectively reduce the blockage inside the connecting plate 14, and can reduce the problem of soil entering the connecting plate 14 that is difficult to clean, so that the airflow can flow smoothly, and the working efficiency of the blowing is effectively improved.
[0033] During operation, the slotting plate 1 is placed at the position where slotting is required, and the support plate 13 is pressed downward to make the two slide bars 12 slide inside the first slide groove 11. When the first blade 15 moves inside the soil, the plant roots in the soil are cut off by the end of the first blade 15, and the internal soil is loosened by multiple groups of first blades 15, and slots in designated areas are opened, and then the soil between the multiple groups of first blades 15 is discharged. After the slotting plate 1 is taken out, the support plate 13 is pulled out, so that the first blade 15 returns to the bottom of the slotting plate 1, and then enters the next area for slotting. One end of the air pipe 2 is connected to the exhaust device, and the airflow is discharged into the air intake pipe 2, so that the airflow enters the exhaust groove 21 from the end of the air intake pipe 2, and then the airflow is discharged through multiple sets of exhaust holes 22 and blown into the loosened soil. The slotted plate 1 is placed on the ground in the designated area. At this time, the fixed cone 3 enters the soil from the bottom. When the fixed cone 3 moves downward, the gripping plate 32 is squeezed by the soil and approaches the fixed cone 3 through the hinge shaft 31. Because the gripping plate 32 is set in an arc shape, the soil will still enter between the gripping plate 32 and the fixed cone 3. When the soil enters between the gripping plate 32 and the fixed cone 3, the gripping plate 3 2 is submerged in the soil and rotates downward. During the rotation of the gripping plate 32, the end of the positioning plate 33 contacts the fixed cone 3, and the gripping plate 32 is stopped at the specified position by the positioning plate 33. When the first blade 15 enters the soil, the soil between the two slide bars 12 is separated by the mesh plate 4, and the soil in the slotted area is blocked. In the process of placing the slotted plate 1 on the ground, the end of the protective plate 51 first contacts the ground and shrinks into the second slide groove 5 as the slotted plate 1 moves, so that the slotted plate 1 fits the ground. When the slotting is completed and the slotted plate 1 is picked up, the spring 52 elastically releases the protective plate 51. The protective plate 51 is slid outward, and the first blade 15 is protected when it moves to the bottom position of the slotting plate 1. When the first blade 15 slides through the two sliding rods 12, the end of the elastic scraper 6 contacts the two sides of the first blade 15 and generates elasticity along with the surface of the first blade 15, so as to scrape off the soil adhering to the surface of the first blade 15. After the slotting is completed, the support plate 13 is pulled upward, and the plant roots and stems wrapped around the middle of the mesh plate 4 are cut off and removed by the second blade 7. When the first blade 15 enters the soil for slotting, the soil is isolated by the filter screen 8.
[0034] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.
Claims
1. A slotting device for pipe network construction, comprising a slotting plate (1); characterized in that: A through slot (10) is provided in the middle of the slotted plate (1); a plurality of first slide slots (11) are provided in the middle of the slotted plate (1); the plurality of first slide slots (11) are arranged at both sides of the slotted plate (1); the first slide slots (11) are arranged obliquely; two slide bars (12) are slidably connected to the middle of the first slide slot (11); the two slide bars (12) are arranged opposite to each other; the ends of the two slide bars (12) are fixedly connected to a support plate (13); the other ends of the two slide bars (12) are fixedly connected to a connecting plate (14); and the bottom of the connecting plate (14) is fixedly connected to a first blade (15).
2. A grooving device for pipe network construction according to claim 1, characterized in that: An air intake pipe (2) is fixedly connected to the middle of one of the sliding rods (12); the end of the air intake pipe (2) passes through the middle of the support plate (13); the other end of the air intake pipe (2) passes through the top of the connecting plate (14); an exhaust groove (21) is provided in the middle of the connecting plate (14); and a plurality of exhaust holes (22) are provided on the side wall of the connecting plate (14).
3. A grooving device for pipe network construction according to claim 2, characterized in that: Two fixed cones (3) are fixedly connected to the bottom of the slotted plate (1); the two fixed cones (3) are arranged opposite to each other; two hinge shafts (31) are fixedly connected to the middle of the fixed cone (3); the two hinge shafts (31) are arranged opposite to each other; a gripping plate (32) is fixedly connected to the middle of the hinge shaft (31); the gripping plate (32) is arranged in an arc shape; a positioning plate (33) is fixedly connected to the middle of the hinge shaft (31); the positioning plate (33) is arranged in an arc shape.
4. A grooving device for pipe network construction according to claim 3, characterized in that: The side walls of the two sliding rods (12) are fixedly connected with mesh plates (4); one end of the mesh plate (4) is fixedly connected to the bottom of the support plate (13); and the other end of the mesh plate (4) is fixedly connected to the top of the connecting plate (14).
5. A grooving device for pipe network construction according to claim 4, characterized in that: The bottom of the slotted plate (1) is fixedly connected to a plurality of groups of second slide grooves (5); every two of the second slide grooves (5) form a group; each group of the second slide grooves (5) is arranged on both sides of the plurality of groups of first slide grooves (11); the second slide grooves (5) are arranged in an inclined manner; a protective plate (51) is slidably connected to the middle of the second slide groove (5); the middle of the protective plate (51) is fixedly connected to a plurality of groups of springs (52); the ends of the plurality of groups of the springs (52) are fixedly connected to the top of the second slide groove (5).
6. A grooving device for pipe network construction according to claim 5, characterized in that: An elastic scraper (6) is fixedly connected to the bottom of the protective plate (51); the elastic scraper (6) is arranged in an inclined manner; and the elastic scraper (6) is arranged in a flexible manner.
7. A grooving device for pipe network construction according to claim 6, characterized in that: The bottom of the slotted plate (1) is fixedly connected to a plurality of groups of second blades (7); two of the second blades (7) form a group; the two second blades (7) are fixedly connected to positions on both sides of the corresponding first slide groove (11); and the second blades (7) are arranged in an inclined manner.
8. A grooving device for pipe network construction according to claim 7, characterized in that: A filter screen (8) is installed in the middle of the exhaust hole (22); the filter screen (8) is fixedly connected to the middle of the exhaust hole (22).