Waste gas cleaning and drainage treatment device for ship

Abstract

The invention relates to the technical field of wastewater treatment, and provides a marine waste gas cleaning and drainage treatment device which comprises a box body, a partition plate and two groups of shearing mechanisms, the partition plate is slidably mounted in the box body and divides the box body into two stirring cavities, and the box body is provided with a sliding mechanism for driving the partition plate to slide; the two shearing mechanisms are installed in the two stirring cavities respectively, each shearing mechanism comprises a plurality of first shearing pieces and a plurality of second shearing pieces, all the first shearing pieces are installed on the sides, away from the partition plate, of the stirring cavities, and all the second shearing pieces are installed on the partition plate and located in the stirring cavities; the second shearing pieces are used for being connected between every two adjacent first shearing pieces in an inserted mode. According to the waste gas cleaning and drainage treatment device for the ship, the mixing effect of waste water and a flocculating agent is improved.

Description

Technical Field

[0001] The present application relates to the technical field of wastewater treatment, and in particular to a device for cleaning and draining waste gas from ships. Background Art

[0002] As an important carrier of international trade, the problem of exhaust gas emissions generated during the operation of ships has increasingly attracted the attention of the international community. Ship exhaust gas mainly contains sulfur oxides (SOx), nitrogen oxides (NOx), particulate matter (PM) and carbon dioxide (CO2), etc. These emissions pose a serious threat to the atmospheric environment, marine ecology and human health. Therefore, it is necessary to wash the exhaust gas, and wastewater will be generated during the exhaust gas washing process and needs to be treated before discharge.

[0003] The existing wastewater treatment device includes a box and a mixing mechanism installed in the box. The box is provided with a water inlet for adding wastewater and a dosing port for adding flocculants. The mixing device stirs and mixes the wastewater and flocculants to aggregate the fine particles in the wastewater into large particles, so that they can enter the separation device at the rear end for separation. However, the mixing effect of the mixing mechanism on the wastewater and flocculants directly affects the efficiency and quality of wastewater treatment, and has become a key link to be optimized in the current wastewater treatment technology. Summary of the invention

[0004] In order to improve the mixing effect of wastewater and flocculant, the present application provides a cleaning and drainage treatment device for ship exhaust gas.

[0005] The present application provides a ship exhaust gas cleaning and drainage treatment device that adopts the following technical solution: A device for cleaning and draining waste gas from ships comprises a box body, a partition plate and two groups of shearing mechanisms, wherein the partition plate is slidably installed in the box body, and the partition plate divides the box body into two stirring chambers, and the box body is provided with a sliding mechanism for driving the partition plate to slide; the two groups of shearing mechanisms are respectively installed in the two stirring chambers, and the shearing mechanisms comprise a plurality of first shearing pieces and a plurality of second shearing pieces, all the first shearing pieces are installed on the side of the stirring chamber away from the partition plate, and all the second shearing pieces are installed on the partition plate and located in the stirring chamber; the second shearing piece is used to be inserted between two adjacent first shearing pieces.

[0006] By adopting the above-mentioned technical scheme, when the device is used to stir wastewater and flocculant, the wastewater is first added into the two stirring chambers, and then the partition plate is driven to slide in the box body through the sliding component, so that the volume in the two stirring chambers can be changed; when the volume in the stirring chamber becomes smaller, the wastewater is squeezed, and at the same time, the second shearing piece is inserted between the two adjacent first shearing pieces, which can make the wastewater and flocculant fully sheared and mixed, thereby improving the treatment effect of the wastewater.

[0007] Optionally, first turbulence blocks are arranged on two opposite sides of the first shear sheet, and second turbulence blocks are arranged on two opposite sides of the second shear sheet.

[0008] By adopting the above technical solution, the setting of the turbulence block can cause the wastewater to generate a certain distance disturbance and vortex when passing through the shearing mechanism, so as to break the laminar flow state in the wastewater and further improve the mixing effect of the wastewater and the flocculant.

[0009] Optionally, the first shear piece and the second shear piece are made of elastic steel sheets, the first turbulator block is provided with a first guide surface, and the second turbulator block is provided with a second guide surface for driving; the first guide surface and the second guide surface cooperate with each other to guide the first shear piece and the second shear piece to move toward a side away from each other.

[0010] By adopting the above-mentioned technical scheme, the first shear piece and the second shear piece made of elastic steel sheets can move toward the side away from each other when the first turbulence block and the second turbulence block are in contact, and restore their original state under their own elasticity, which can increase the mixing effect of wastewater and flocculant; in the process of movement of the shear piece, the sediment attached to the shear piece can be shaken off, so that the sediment in the stirring chamber can be discharged to the outside.

[0011] Optionally, the stirring chamber is provided with a stirring mechanism, and the stirring mechanism is provided with a stirring rod, a stirring blade and a first motor, and all first shear pieces are provided with avoidance openings; the stirring rod is rotatably installed in the stirring chamber and penetrates all the avoidance openings, the stirring blade is fixed to the side wall of the stirring rod, and the first motor is used to drive the stirring rod to rotate.

[0012] By adopting the above technical solution and providing a stirring mechanism, the stirring blades can stir the wastewater in the stirring chamber, thereby further improving the mixing effect of the wastewater and the flocculant.

[0013] Optionally, the sliding mechanism includes a second motor and an eccentric wheel, a reversing cavity is opened inside the partition plate, and the eccentric wheel is rotatably installed in the box body and is located in the reversing cavity; the second motor is used to drive the eccentric wheel to rotate, and the outer wall of the eccentric wheel is used to abut against the opposite sides of the reversing cavity.

[0014] By adopting the above technical solution, the eccentric wheel is driven to rotate by the second motor so that its outer wall will periodically abut against the opposite sides of the reversing cavity. Since the shape of the eccentric wheel is not completely circular, its rotation will cause the position of the contact point with the reversing cavity to change continuously. When the outer wall of the eccentric wheel abuts against one side of the reversing cavity, a thrust is generated to push the partition plate to move toward that side; as the eccentric wheel rotates, the eccentric wheel abuts against the other side of the reversing cavity, and an opposite thrust is generated to push the partition plate to move to the other side. In this way, the reciprocating movement of the partition plate can be achieved through the continuous rotation of the eccentric wheel.

[0015] Optionally, sliding holes connected to the two stirring chambers are respectively provided on opposite sides of the reversing chamber, and sliding blocks connected to the second shear plate are slidably installed in the sliding holes; a sliding plate is slidably installed on the inner wall of the stirring chamber, and the sliding plate is connected to all the sliding blocks on one side of the reversing chamber; a guide block for abutting against the outer wall of the deviation wheel is provided on the side of the sliding plate close to the eccentric wheel, and the guide block is used to guide the sliding plate to move toward the side away from the eccentric wheel; a spring is provided on the sliding plate and the inner wall of the reversing chamber, and the elastic force of the spring is used to drive the guide block to move toward one side of the eccentric wheel.

[0016] By adopting the above technical solution, when the eccentric wheel rotates in the reversing chamber, the eccentric wheel can abut against the guide block and drive the guide block to move toward the side away from the eccentric wheel; because the second shearing piece is connected to the slide plate, the second shearing piece can be driven to slide in the stirring chamber; and when the eccentric wheel cancels the abutment with the guide block, the slide plate moves toward one side of the eccentric wheel under the elastic force of the spring, so that the second shearing piece returns to its original state. The continuous rotation of the eccentric wheel can make the second shearing piece move up and down in the stirring chamber, further improving the stirring effect of the wastewater and flocculant.

[0017] Optionally, the box body is provided with a dosing tube connected to the stirring chamber, a dosing roller is rotatably installed in the dosing tube, and the dosing tube is provided with a third motor for driving the dosing roller to rotate; a plurality of dosing grooves for communicating with the stirring chamber are installed on the outer wall of the dosing tube, and all the dosing grooves are circumferentially spaced along the outer wall of the dosing roller.

[0018] By adopting the above technical solution, the dosing roller will evenly transport the agent from the dosing pipe to the stirring chamber during the rotation process. Since the dosing grooves are arranged at intervals along the circumferential direction of the outer wall of the dosing roller, the distribution of the agent in the stirring chamber will also be more uniform. This evenly distributed agent helps to reduce the phenomenon of local over-concentration or over-diluted in the wastewater treatment process and improve the overall treatment effect.

[0019] Optionally, the box body is provided with a water outlet pipe connected to the bottom of the stirring chamber, the first shearing piece is inclined downwardly toward the side of the second shearing piece, and the second shearing piece is inclined upwardly toward the side of the first shearing piece.

[0020] By adopting the above technical solution, the inclined first shear piece and the second shear piece can generate a greater shear force when they move relative to each other; and the first shear piece is tilted downward on the side close to the second shear piece, which can avoid the accumulation of sediment at the connection between the first shear piece and the inner wall of the stirring chamber, so as to facilitate the discharge of the sediment to the outside.

[0021] Optionally, a through hole is formed on a side of the second shear piece close to the partition plate.

[0022] By adopting the above technical solution and providing the through hole, it is possible to prevent the sediment from accumulating at the connection between the second shearing piece and the inner wall of the stirring chamber, so as to discharge the sediment to the outside.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: 1. By sliding the partition plate to the box body, the volume of the two stirring chambers can be changed; when the volume of the stirring chamber becomes smaller, the wastewater is squeezed, and at the same time, the second shearing piece is inserted between the two adjacent first shearing pieces, which can fully shear and mix the wastewater and the flocculant, thereby improving the treatment effect of the wastewater; 2. By making the first shear piece and the second shear piece of elastic steel sheets, when the first turbulence block and the second turbulence block are in contact, the first shear piece and the second shear piece can move toward the side away from each other, so that they can have a certain deformation and restoring force, which can increase the mixing effect of wastewater and flocculant; and in the process of movement of the shear piece, the sediment attached to the shear piece can be shaken off, so that the sediment in the stirring chamber can be discharged to the outside. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a partial cross-sectional view of Example 1; Figure 2 yes Figure 1 The partial enlarged view of point a mainly shows the dosing roller; Figure 3 yes Figure 1 The local enlarged view at b mainly shows the first turbulent block and the second turbulent block; Figure 4 is a partial cross-sectional view of the box body of Example 1, mainly showing the avoidance opening and the through hole; Figure 5 is a partial cross-sectional view of Example 2; Figure 6 yes Figure 5 A local enlarged view of point c.

[0025] Explanation of the reference numerals: 1. housing; 11. stirring chamber; 12. dosing pipe; 13. water inlet pipe; 14. water outlet pipe; 2. partition plate; 21. rubber layer; 22. reversing chamber; 23. sliding hole; 24. sliding block; 25. slide plate; 26. guide block; 27. spring; 28. third guide surface; 3. eccentric wheel; 4. shearing mechanism; 41. first shearing piece; 42. second shearing piece; 43. first turbulent block; 44. second turbulent block; 45. first guide surface; 46. second guide surface; 47. through hole; 48. avoidance port; 5. dosing roller; 51. third motor; 52. dosing tank; 6. stirring mechanism; 61. stirring rod; 62. stirring blade; 63. first motor. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1-6 This application is described in further detail. Embodiment 1:

[0027] The embodiment of the present application discloses a device for cleaning and draining waste gas from a ship.

[0028] Reference Figure 1 A device for cleaning and draining waste gas from a ship comprises a housing 1, a partition plate 2, a sliding mechanism and two sets of shearing mechanisms 4. The partition plate 2 is slidingly installed inside the housing 1 and divides the housing 1 into two stirring chambers 11. The housing 1 is provided with a dosing pipe 12, a water inlet pipe 13 and a water outlet pipe 14 for communicating with the stirring chamber 11. The dosing pipe 12 is used to add a flocculant into the stirring chamber 11. The water inlet pipe 13 is used to add wastewater into the stirring chamber 11. The water outlet pipe 14 is installed at the bottom of the housing 1 to discharge the wastewater and sediment in the stirring chamber 11 to the outside.

[0029] Also refer to Figure 2 In this embodiment, the cross section of the dosing tube 12 is rectangular; a dosing roller 5 is rotatably installed in the dosing tube 12, and the dosing roller 5 covers the tube mouth of the dosing tube 12. The dosing tube 12 is provided with a third motor 51 for driving the dosing roller 5 to rotate; a plurality of dosing grooves 52 are provided on the outer wall of the dosing tube 12, and all the dosing grooves 52 are arranged at intervals along the circumferential direction of the outer wall of the dosing roller 5, and the dosing grooves 52 are used to add flocculants into the stirring chamber 11. By providing a plurality of dosing grooves 52, flocculants can be uniformly added into the stirring chamber 11, so that the agent is evenly distributed in the stirring chamber 11, thereby improving the stirring effect.

[0030] Reference Figure 1The two sets of shearing mechanisms 4 are respectively installed in the two stirring chambers 11. The shearing mechanisms 4 include a plurality of first shearing pieces 41 and second shearing pieces 42. The first shearing pieces 41 and the second shearing pieces 42 are made of elastic steel sheet material. All the first shearing pieces 41 are installed on the side of the stirring chamber 11 away from the partition plate 2. All the first shearing pieces 41 are arranged at intervals along the height direction of the box body 1, and the side of the first shearing pieces 41 close to the partition plate 2 is arranged downwardly tilted.

[0031] All second shear pieces 42 are installed on the side of the partition plate 2 close to the stirring chamber 11, and all second shear pieces 42 are arranged at intervals along the height direction of the box body 1, and the side of the second shear piece 42 away from the partition plate 2 is inclined upward; when the partition plate 2 moves back and forth in the box body 1, the second shear piece 42 is inserted between two adjacent first shear pieces 41.

[0032] In this embodiment, a through hole 47 is formed on one side of the second shearing piece 42 close to the partition plate 2 to prevent sediment from accumulating at the connection between the second shearing piece 42 and the inner wall of the stirring chamber 11 , so as to discharge the sediment to the outside.

[0033] Reference Figure 3 The first shear piece 41 is provided with first turbulation blocks 43 on both upper and lower sides, and first guide surfaces 45 are provided on opposite sides of the first turbulation block 43, and the distance between the two first guide surfaces 45 gradually decreases from the side close to the first shear piece 41 toward the side away from the first shear piece 41; the second shear piece 42 is provided with second turbulation blocks 44 on both upper and lower sides, and second guide surfaces 46 are provided on opposite sides of the second turbulation block 44, and the distance between the two second guide surfaces 46 gradually decreases from the side close to the second shear piece 42 toward the side away from the second shear piece 42.

[0034] When the second shear piece 42 moves toward between two adjacent first shear pieces 41, the second turbulence block 44 on one side of the second shear piece 42 contacts the first turbulence block 43 on one side of one of the first shear pieces 41. At this time, the first guide surface 45 abuts against the second guide surface 46 and drives the first shear piece 41 and the second shear piece 42 to move toward the side away from each other; and when the first turbulence block 43 cancels the contact with the second turbulence block 44, the first shear piece 41 and the second shear piece 42 restore their original state under their own elastic force; thereby, the first shear piece 41 and the second shear piece 42 can be shaken, and while increasing the stirring effect of the wastewater and the flocculant, the precipitate attached to the surface of the first shear piece 41 / the second shear piece 42 can be shaken off, so that the precipitate in the stirring chamber 11 can be discharged to the outside.

[0035] Reference Figure 1 and Figure 4A stirring mechanism 6 is provided in the stirring chamber 11, and the stirring mechanism 6 includes a stirring rod 61, a first motor 63, and a plurality of stirring blades 62. A side of the first shearing piece 41 close to the second shearing piece 42 is provided with an escape opening 48, and the escape opening 48 is connected with the upper and lower sides of the first shearing piece 41; the stirring rod 61 is rotatably installed in the stirring chamber 11 and penetrates the escape openings 48 of all the first shearing pieces 41. All the stirring blades 62 are installed on the outer wall of the stirring rod 61 and are arranged at intervals along the length direction of the stirring rod 61. The first motor 63 is installed on the outside of the box body 1 to drive the stirring rod 61 to rotate.

[0036] In this embodiment, a rubber layer 21 is provided at the joint between the partition plate 2 and the inner wall of the box body 1. The rubber layer 21 can increase the sealing between the two stirring chambers 11 to prevent wastewater from entering the other stirring chamber 11 from one stirring chamber 11 through the gap between the partition plate 2 and the box body 1.

[0037] The sliding mechanism includes an eccentric wheel 3 and a second motor. The partition plate 2 is provided with a reversing cavity 22. The eccentric wheel 3 is rotatably mounted on the housing 1 and is located in the reversing cavity 22. The second motor (not shown in the figure) is mounted on the housing 1 and is used to drive the eccentric wheel 3 to rotate. The second motor drives the eccentric wheel 3 to rotate, so that the eccentric wheel 3 can be respectively abutted against the opposite side walls of the annular cavity.

[0038] Since the shape of the eccentric wheel 3 is not completely circular, its rotation causes the position of the contact point with the reversing cavity 22 to change continuously. When the outer wall of the eccentric wheel 3 abuts against one side of the reversing cavity 22, a thrust is generated to push the partition plate 2 to move toward that side; as the eccentric wheel 3 rotates, the eccentric wheel 3 abuts against the other side of the reversing cavity 22, and an opposite thrust is generated to push the partition plate 2 to move toward the other side. In this way, the reciprocating movement of the partition plate 2 can be achieved through the continuous rotation of the eccentric wheel 3.

[0039] The implementation principle of Example 1 of the present application is: When the device is used to stir wastewater and flocculant, the wastewater is first added into the two stirring chambers 11, and then the partition plate 2 is driven to slide in the box body 1 through the sliding component, so that the volume in the two stirring chambers 11 can be changed; when the volume in the stirring chamber 11 becomes smaller, the wastewater is squeezed, and at the same time, the second shearing piece 42 is inserted between the two adjacent first shearing pieces 41, which can fully shear and mix the wastewater and the flocculant, thereby improving the treatment effect of the wastewater. Embodiment 2:

[0040] The embodiment of the present application discloses a device for cleaning and draining waste gas from a ship.

[0041] Reference Figure 5 and Figure 6The difference between Example 2 of the present application and Example 1 is that: a sliding hole 23 is vertically opened on the partition plate 2, and the two ends of the sliding hole 23 are respectively connected to the stirring chamber 11 and the reversing chamber 22, and a sliding block 24 connected to the second shear piece 42 is slidably installed in the sliding hole 23. By sliding the sliding block 24 in the sliding hole 23, the second shear piece 42 can be moved up and down in the stirring chamber 11.

[0042] Slide plates 25 are slidably installed on opposite sides of the reversing chamber 22, and the slide plates 25 are connected to all the slide blocks 24 on one side of the reversing chamber 22; the second shearing pieces 42 in the stirring chamber 11 can be moved simultaneously by sliding the slide plates 25. Guide blocks 26 are provided on the sides of the two slide plates 25 that are close to each other, and the two guide blocks 26 are respectively located opposite to the eccentric wheel 3; the side of the guide block 26 close to the eccentric wheel 3 is set as a third guide surface 28, and the side of the guide block 26 away from the eccentric wheel 3 is set as a reference surface, and the distance between the third guide surface 28 and the reference surface gradually increases from the side close to the slide plate 25 to the side away from the slide plate 25.

[0043] A spring 27 is provided between the slide plate 25 and the inner wall of the reversing chamber 22 , and the elastic force of the spring 27 is used to drive the guide block 26 to move toward one side of the eccentric wheel 3 .

[0044] The implementation principle of Example 2 of the present application is: When the eccentric wheel 3 rotates in the reversing chamber 22, the eccentric wheel 3 can abut against the guide block 26 and drive the guide block 26 to move toward the side away from the eccentric wheel 3; because the second shearing piece 42 is connected to the slide plate 25, the second shearing piece 42 can be driven to slide in the stirring chamber 11; and when the eccentric wheel 3 cancels the abutment with the guide block 26, the slide plate 25 moves toward one side of the eccentric wheel 3 under the elastic force of the spring 27, so that the second shearing piece 42 returns to its original state. The continuous rotation of the eccentric wheel 3 can make the second shearing piece 42 reciprocate in the stirring chamber 11, further improving the stirring effect of the wastewater and the flocculant.

[0045] The above are preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A cleaning and drainage treatment device for ship exhaust gas, characterized in that: The invention comprises a box body (1), a partition plate (2) and two groups of shearing mechanisms (4), wherein the partition plate (2) is slidably mounted in the box body (1), and the partition plate (2) divides the box body (1) into two stirring chambers (11), and the box body (1) is provided with a sliding mechanism for driving the partition plate (2) to slide; the two groups of shearing mechanisms (4) are respectively mounted in the two stirring chambers (11), and the shearing mechanisms (4) comprise a plurality of first shearing pieces (41) and a plurality of second shearing pieces (42), all the first shearing pieces (41) are mounted on a side of the stirring chamber (11) away from the partition plate (2), and all the second shearing pieces (42) are mounted on the partition plate (2) and located in the stirring chamber (11); and the second shearing pieces (42) are used to be inserted between two adjacent first shearing pieces (41).

2. The cleaning and drainage treatment device for ship exhaust gas according to claim 1, characterized in that: The first shearing piece (41) is provided with first turbulence blocks (43) on two opposite sides, and the second shearing piece (42) is provided with second turbulence blocks (44) on two opposite sides.

3. The device for cleaning and draining waste gas from a ship according to claim 2, characterized in that: The first shearing piece (41) and the second shearing piece (42) are made of elastic steel sheets; the first turbulent block (43) is provided with a first guide surface (45); the second turbulent block (44) is provided with a second guide surface (46) for driving; the first guide surface (45) and the second guide surface (46) cooperate with each other to guide the first shearing piece (41) and the second shearing piece (42) to move toward a side away from each other.

4. The cleaning and drainage treatment device for ship exhaust gas according to claim 1, characterized in that: The stirring chamber (11) is provided with a stirring mechanism (6), the stirring mechanism (6) is provided with a stirring rod (61), a stirring blade (62) and a first motor (63), and all first shearing pieces (41) are provided with avoidance openings (48); the stirring rod (61) is rotatably mounted on the stirring chamber (11) and penetrates all avoidance openings (48), the stirring blade (62) is fixed to a side wall of the stirring rod (61), and the first motor (63) is used to drive the stirring rod (61) to rotate.

5. The device for cleaning and draining waste gas from a ship according to claim 1, characterized in that: The sliding mechanism comprises a second motor and an eccentric wheel (3); a reversing cavity (22) is provided inside the partition plate (2); the eccentric wheel (3) is rotatably mounted on the housing (1) and is located in the reversing cavity (22); the second motor is used to drive the eccentric wheel (3) to rotate; and the outer wall of the eccentric wheel (3) is used to abut against opposite sides of the reversing cavity (22).

6. The device for cleaning and draining waste gas from a ship according to claim 5, characterized in that: The reversing chamber (22) is provided with sliding holes (23) connected to the two stirring chambers (11) on opposite sides, and sliding blocks (24) connected to the second shearing piece (42) are slidably mounted in the sliding holes (23); a sliding plate (25) is slidably mounted on the inner wall of the stirring chamber (11), and the sliding plate (25) is connected to all the sliding blocks (24) on one side of the reversing chamber (22); a guide block (26) for abutting against the outer wall of the eccentric wheel (3) is arranged on the side of the sliding plate (25) close to the eccentric wheel (3), and the guide block (26) is used to guide the sliding plate (25) to move toward a side away from the eccentric wheel (3); a spring (27) is arranged between the sliding plate (25) and the inner wall of the reversing chamber (22), and the elastic force of the spring (27) is used to drive the guide block (26) to move toward one side of the eccentric wheel (3).

7. The device for cleaning and draining waste gas from a ship according to claim 1, characterized in that: The housing (1) is provided with a dosing tube (12) connected to the stirring chamber (11), a dosing roller (5) is rotatably mounted in the dosing tube (12), and the dosing tube (12) is provided with a third motor (51) for driving the dosing roller (5) to rotate; a plurality of dosing grooves (52) for connecting to the stirring chamber (11) are mounted on the outer wall of the dosing tube (12), and all the dosing grooves (52) are arranged at intervals along the circumferential direction of the outer wall of the dosing roller (5).

8. The device for cleaning and draining waste gas from a ship according to claim 1, characterized in that: The box body (1) is provided with a water outlet pipe (14) connected to the bottom of the stirring chamber (11); the first shearing piece (41) is arranged to be tilted downwards on one side facing the second shearing piece (42); and the second shearing piece (42) is arranged to be tilted upwards on one side facing the first shearing piece (41).

9. The device for cleaning and draining waste gas from a ship according to claim 8, characterized in that: A through hole (47) is provided on a side of the second shearing piece (42) close to the partition plate (2).

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