A tilting device for ladle two-way exchange

Abstract

This invention relates to the field of iron and steel metallurgy technology and discloses a tilting device for bidirectional steel tapping in a ladle. The device includes a ladle body with two symmetrically arranged tapping nozzles at its open end. A tilting replacement assembly is provided on the ladle body. This assembly allows molten steel to flow evenly from both sides of the ladle body, reducing scouring of the tapping nozzles on one side and extending the service life of the ladle body. This invention enables the ladle body to tap steel in two directions via the tilting replacement assembly, improving the ladle's turnover efficiency and increasing overall production capacity. This helps reduce unit production costs. Bidirectional tapping disperses the scouring effect of molten steel to both tapping openings and surrounding areas, reducing the erosion of refractory materials at individual tapping openings, extending the service life of refractory materials, and reducing the frequency and amount of refractory material replacement, thereby lowering costs.

Description

Technical Field

[0001] This invention relates to the field of iron and steel metallurgy technology, specifically to a tilting device for realizing bidirectional steel loading from a ladle. Background Technology

[0002] Currently, in the steel metallurgical industry, the ladle is an important container used to receive and transfer molten steel during the AOD furnace steelmaking process in steel plants. It is especially used in the AOD smelting process to perform the steel-pouring operation. Usually, after the steel is tapped from the electric arc furnace, the molten steel is poured into the ladle and then poured from the ladle into the AOD refining furnace. In the traditional method of tapping steel through a tapping trough, the molten steel always washes against one side of the ladle, causing the refractory material in the washed area to thin rapidly. This leads to frequent offline maintenance and a short service life of the ladle refractory material. Generally, it must be taken offline for major overhaul after 50-60 uses. Summary of the Invention

[0003] The purpose of this invention is to provide a tilting device for bidirectional steel loading in a steel ladle, so as to solve the problems mentioned in the background art.

[0004] Technical solution

[0005] The present invention provides the following technical solution: a tilting device for realizing bidirectional steel pouring in a steel ladle, comprising a steel ladle body, wherein two steel pouring nozzles are symmetrically arranged at the open end of the steel ladle body, and a tilting replacement component is provided on the steel ladle body. The tilting replacement component enables molten steel in the steel ladle body to flow out evenly from both sides, reducing the scouring of the steel pouring nozzle on one side of the steel ladle body, thereby extending the service life of the steel ladle body.

[0006] The tilting replacement assembly includes a lifting frame and a tie rod. The lifting frame can be individually connected to both ends of the tie rod to adjust the position of the lifting frame on both sides of the ladle body.

[0007] Preferably, the ladle body is provided with a lifting frame hanging plate and a tie rod hanging plate, and a pin is provided on the lifting frame, so that the lifting frame hanging plate can contact the lifting frame hanging plate through the pin.

[0008] Preferably, the tie rod is provided with a first pin and a second pin, the lifting frame is connected to the tie rod through the first pin, and the tie rod hanging plate is connected to the tie rod through the second pin.

[0009] Preferably, the bottom end of the ladle body is provided with a fixed frame and a fixed bracket. The fixed frame is provided with a plug-in column, and the pull rod is provided with a plug-in slot. The plug-in column drives the pull rod to move laterally on the ladle body through the plug-in slot, which facilitates the adjustment of the pull rod direction and connection with the lifting frame.

[0010] Preferably, the fixed frame is provided with a push plate, a movable plate and a sliding block. The push plate is provided with a push rod, a push column and an inclined push rod. The push rod is fixedly connected to the plug-in column. The push plate, the sliding block and the movable plate are distributed from top to bottom.

[0011] Preferably, the bottom end of the sliding block is provided with a locking block, the top end of the movable plate is provided with a locking groove, and a return spring is provided on the movable plate. The sliding block contacts the movable plate through the locking block and the locking groove, and the inclined push rod contacts the movable plate through the inclined surface.

[0012] Preferably, the sliding block has a communicating cavity, in which a first inclined push block, a second inclined push block, and a limiting post are provided. The first inclined push block and the second inclined push block are in contact through their inclined sides, and the pushing post is in contact with the first inclined push block.

[0013] Preferably, a limiting groove is provided in the pushing column, the limiting column is fixed to the pushing column through the limiting groove, and a push plate is provided on the side of the limiting column.

[0014] Preferably, the fixing frame is provided with a spring-loaded component and a sliding rod, the end of the sliding rod is provided with a toothed post, the push rod slides in contact with the sliding rod, and the fixing frame is provided with a through groove that matches the push rod.

[0015] Preferably, the pull rod plate is provided with a connecting frame, the connecting frame is provided with a fixing plate, the fixing plate is provided with a lead screw, the lead screw is provided with a rotating gear and a moving block, the gear column is meshed with the rotating gear, and the moving block is provided with a shaft end baffle.

[0016] Beneficial effects

[0017] Compared with the prior art, the present invention provides a tilting device for realizing bidirectional steel loading in steel ladles, which has the following beneficial effects:

[0018] 1. In this invention, by tilting and replacing the component, the ladle body can discharge steel in two directions, improving the turnover efficiency of the ladle and thus increasing the overall production capacity. To a certain extent, it also distributes equipment investment and labor costs, and in the long run, it helps to reduce unit production costs.

[0019] 2. In this invention, bidirectional steel tapping can disperse the scouring effect of molten steel to the two tapping ports and surrounding areas, reducing the degree of refractory material erosion at a single tapping port, extending the service life of the refractory material, reducing the frequency and amount of refractory material replacement, and thus reducing costs.

[0020] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this disclosure.

[0021] This application provides an overview of various implementations or examples of the technology described in this disclosure, and is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0023] Figure 1 This is a front view of the overall body of the steel ladle of the present invention;

[0024] Figure 2 This is a schematic diagram of the bottom tie rod of the steel ladle body of the present invention;

[0025] Figure 3 This is a bottom view of the ladle body of the present invention;

[0026] Figure 4 This is the first viewpoint after the bottom of the steel ladle body of the present invention has been flipped over;

[0027] Figure 5 This is the second viewpoint after the bottom of the steel ladle body of the present invention has been flipped over;

[0028] Figure 6 This is a schematic diagram of the interior of the fixing frame of the present invention;

[0029] Figure 7 For the present invention Figure 6 Enlarged view at point B in the middle;

[0030] Figure 8 This is a schematic diagram of the connection between the pushing column and the sliding block in this invention;

[0031] Figure 9 This is a schematic diagram of the interior of the connecting cavity before the push column and the sliding block are connected in this invention;

[0032] Figure 10 For the present invention Figure 4 Enlarged view of point A in the middle;

[0033] Figure 11 This is a schematic diagram of the sliding rod adjusting the shaft end baffle through the internal structure of the connecting frame in this invention;

[0034] Figure 12 This is a schematic diagram of the bidirectional steel loading process of the steel loading ladle body according to the present invention.

[0035] Explanation of reference numerals in the attached figures:

[0036] In the diagram: 1. Steel ladle body; 2. Lifting frame hanging plate; 3. Tie rod hanging plate; 4. Lifting frame; 5. First pin; 6. Second pin; 7. Shaft end baffle; 8. Steel ladle nozzle; 9. Tie rod; 10. Fixed frame; 11. Push plate; 12. Push rod; 13. Fixed frame; 14. Insertion pin; 15. Insertion slot; 16. Push pin; 17. Inclined push rod; 18. Hand push plate; 19. Movable plate; 20. Sliding block; 21. Connecting cavity; 22. First inclined push block; 23. Second inclined push block; 24. Limiting pin; 25. Limiting slot; 26. Connecting frame; 27. Sliding rod; 28. Gear pin; 29. ​​Fixed plate; 30. Lead screw; 31. Rotating gear; 32. Moving block. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Example:

[0039] Please see Figures 1-12 The present invention provides a technical solution: a tilting device for bidirectional steel pouring in a ladle, comprising a ladle body 1, trunnions movably mounted on opposite sides of the ladle body 1, the trunnions facilitating the tilting of the ladle body 1, steel pouring nozzles 8 symmetrically fixedly mounted on the open ends of the ladle body 1, and a tilting replacement component provided on the ladle body 1, the tilting replacement component enabling molten steel in the ladle body 1 to flow out evenly from both sides, reducing the scouring of the steel pouring nozzle 8 on one side of the ladle body 1, thereby extending the service life of the ladle body 1;

[0040] The tilting replacement assembly includes a lifting frame 4 and a tie rod 9. The lifting frame 4 can be individually connected to both ends of the tie rod 9 to adjust the position of the lifting frame 4 on both sides of the ladle body 1.

[0041] In this embodiment, lifting frame hanging plates 2 are fixedly installed on the symmetrical sides of the ladle body 1, and tie rod hanging plates 3 are fixedly installed on the symmetrical sides of the bottom end of the ladle body 1. The lifting frame hanging plates 2 and the tie rod hanging plates 3 are in the same plane. A pin is provided through the lifting frame 4. When not in use, the lifting frame 4 is parallel to the outer wall of the ladle body 1. The lifting frame 4 contacts the lifting frame hanging plates 2 through the pin, which increases the stability of the lifting frame 4 and prevents the lifting frame 4 from tilting. The lifting frame 4 can contact the lifting frame hanging plates 2 through the pin.

[0042] In this embodiment, the two ends of the pull rod 9 are respectively movably connected by a first pin 5 and a second pin 6. The lifting frame 4 is connected to the pull rod 9 through the first pin 5, and the pull rod hanging plate 3 is connected to the pull rod 9 through the second pin 6. When the lifting frame 4 is connected to the pull rod 9, the other end of the pull rod 9 will be connected to the pull rod hanging plate 3 at the other end through the second pin 6. The second pin 6 is not installed in the pull rod hanging plate 3 on the side close to the lifting frame 4, which also ensures that the pull rod 9 will not be obstructed by other structures when it is at the bottom of the ladle body 1, and ensures the stable operation of the lifting frame 4 and the pull rod 9 when the ladle body 1 is tilted.

[0043] When the ladle body 1 needs to empty its molten steel, the ladle body 1 is suspended by trunnions. The overhead crane is connected to the top of the lifting frame 4. When the overhead crane is working, it will drive the lifting frame 4 to move upward. The lifting frame 4 will disengage from the lifting frame hanging plate 2 and will drive the tie rod 9 to move together through the first pin 5 and the second pin 6. Then, the tie rod hanging plate 3 connected to the other end of the tie rod 9 will drive the ladle body 1 to tilt, so that the molten steel in the ladle body 1 flows out through the ladle nozzle 8.

[0044] When the steel-filling nozzle 8 on one side reaches the end of its service life, the lifting frame 4 and the tie rod 9 are separated, and the tie rod 9 is separated from the tie rod mounting plate 3. After separation, the tie rod 9 is moved laterally a certain distance, so that the connection between the tie rod 9 and the lifting frame 4 is moved to the tie rod mounting plate 3 closer to the original side of the lifting frame 4. Similarly, the other end of the tie rod 9 will be separated from the other end of the tie rod mounting plate 3. The lifting frame 4 is then moved to the other side of the steel-filling ladle body 1 by a crane or other tools. The lifting frame 4 and the tie rod 9, and the tie rod 9 and the tie rod mounting plate 3 are then reconnected through the first pin 5 and the second pin 6. In this way, the lifting frame 4... The position will be moved from one side of the ladle body 1 to the other symmetrical side, so that the molten steel in the ladle body 1 will flow out from the ladle spout 8 on the other side, thereby achieving the purpose of bidirectional ladle pouring. This allows the molten steel in the ladle body 1 to flow out evenly from both sides, reducing the scouring of one side of the ladle body 1 and extending its service life. This not only improves economic efficiency, but also its center of gravity is located on the vertical line of the ladle body 1, so it will not tilt during hoisting, increasing the safety factor. The arc-shaped small liquid outlet guide design also makes it easy to center the refining furnace mouth when pouring out the molten steel, which is easy to operate.

[0045] In this embodiment, a fixed frame 10 and a fixed bracket 13 are fixedly installed at the bottom of the ladle body 1. A plug-in post 14 is movably installed in the fixed frame 10, and a plug-in groove 15 is provided in the pull rod 9. The plug-in post 14 drives the pull rod 9 to move laterally on the ladle body 1 through the plug-in groove 15, which facilitates the adjustment of the direction of the pull rod 9 and its connection with the lifting frame 4. When the plug-in post 14 is connected to the pull rod 9, it can drive the pull rod 9 to move laterally at the bottom of the ladle body 1. This facilitates the replacement of the position of the lifting frame 4 and prevents the pull rod 9 from falling to the ground and being damaged during disassembly. It also reduces the reinstallation time of the lifting frame 4 and the pull rod 9.

[0046] In this embodiment, a push plate 11, a movable plate 19, and a sliding block 20 are movably installed in the fixed frame 10. A push rod 12 is fixedly installed at the top of the push plate 11, and a push column 16 and an inclined push rod 17 are fixedly installed at the bottom of the push plate 11. The push column 16 is located between the two inclined push rods 17. The top of the push rod 12 is fixedly connected to the plug-in column 14. The push plate 11, the sliding block 20, and the movable plate 19 are distributed sequentially from top to bottom. When the position of the pull rod 9 does not need to be adjusted, there is no misalignment between the sliding block 20 and the movable plate 19, but there is misalignment between the push plate 11 and the sliding block 20.

[0047] In this embodiment, the bottom end of the sliding block 20 is fixedly equipped with a locking block at equal intervals, and the top end of the movable plate 19 is provided with a locking groove at equal intervals to match the locking block. A return spring is fixedly installed on the side of the movable plate 19 away from the locking groove. The sliding block 20 contacts the movable plate 19 through the locking block and the locking groove. The sliding block 20 always moves in a straight line in the fixed frame 10, and the movement trajectory of the sliding block 20 is parallel to the movable plate 19. The inclined push rod 17 contacts the movable plate 19 through the inclined surface.

[0048] When the inclined push rod 17 moves toward the fixed frame 10, the inclined push rod 17 will drive the movable plate 19 to move down gradually through the inclined plane until the sliding block 20 is completely separated from the movable plate 19, so that the sliding block 20 can move laterally in the fixed frame 10.

[0049] In this embodiment, the sliding block 20 has a communicating cavity 21, in which a first inclined push block 22, a second inclined push block 23 and a limiting post 24 are movably installed. The first inclined push block 22 and the second inclined push block 23 are in contact through their inclined sides. The space between the second inclined push block 23 and the limiting post 24 is sealed and no gas leaks out. The pushing post 16 is in contact with the first inclined push block 22.

[0050] In this embodiment, a limiting groove 25 is provided in the pushing column 16, and the limiting column 24 is fixed to the pushing column 16 through the limiting groove 25. When the pushing column 16 enters the sliding block 20, the pushing column 16 will drive the first inclined push block 22 to move inward, and drive the second inclined push block 23 to move into the communicating cavity 21 through the inclined side. Since the communicating cavity 21 is in a closed state, the movement of the second inclined push block 23 will also drive the limiting column 24 to move until the limiting column 24 is connected to the limiting groove 25 in the pushing column 16. In this way, the pushing column 16 will be locked in the sliding block 20, that is, the pushing plate 11 and the sliding block 20 become one. A push plate 18 is fixedly installed on the side of the limiting column 24. A sliding groove matching the push plate 18 is provided in the sliding block 20. This sliding groove is not connected to the communicating cavity 21. Even when the limiting column 24 moves, the sliding groove will not connect to the communicating cavity 21.

[0051] Both the push plate 11 and the push plate 18 extend through the outer side of the fixed frame 10, and a sliding cavity matching the push plate 11 and the push plate 18 is provided in the outer wall of the fixed frame 10. The length of the sliding cavity is equal to the distance from the first connection point between the lifting frame 4 and the pull rod 9 to the second connection point between the pull rod 9 and the pull rod hanging plate 3 after the pull rod 9 moves laterally.

[0052] In this embodiment, the fixing frame 13 is provided with a spring-loaded component and a sliding rod 27. The end of the sliding rod 27 is provided with a toothed post 28. The push rod 12 slides in contact with the sliding rod 27, and the fixing frame 13 is provided with a through groove that matches the push rod 12.

[0053] In this embodiment, a connecting frame 26 is fixedly installed on the side of the pull rod hanging plate 3. A fixing plate 29 is fixedly installed in the connecting frame 26. A lead screw 30 is movably installed on the fixing plate 29. A rotating gear 31 is fixedly installed on the lead screw 30 and a moving block 32 is threadedly connected to it. The gear column 28 meshes with the rotating gear 31. A shaft end baffle 7 is fixedly installed on one end of the moving block 32. At the same time, a shaft end baffle 7 can also be fixedly installed on the lifting frame 4 by bolts. The shaft end baffle 7 can protect the stability of the first pin 5 and the second pin 6, that is, prevent the first pin 5 and the second pin 6 from separating, ensure the tight connection between the lifting frame 4 and the pull rod 9, and ensure the tight connection between the pull rod 9 and the pull rod hanging plate 3.

[0054] The working principle of this embodiment is as follows: After the steel-filling nozzle 8 on one side of the steel-filling ladle body 1 reaches the end of its service life, the lifting frame 4 is kept stationary with the assistance of a crane or gantry crane. The push plate 11 at the bottom of the steel-filling ladle body 1 is first pushed into the fixed frame 10. When the push plate 11 moves, it will drive the push column 16 into the sliding block 20. At the same time, when the push column 16 moves, it will drive the inclined push rod 17 to move together. When the inclined push rod 17 moves, it will drive the movable plate 19 to move down through the inclined surface, so that the sliding block 20 and the movable plate 19 are separated from each other. At the same time, the push column 16 will contact the first inclined push block 22. As the push column 16 continues to move, the first inclined push block 22 will drive the second inclined push block 23 to move through the inclined side. When the second inclined push block 23 moves, it will cause the limiting column 24 to move through the connecting cavity 21. When the position post 24 moves, it connects to the push post 16 through the insertion slot 15, and also drives the push plate 18 to move. In this way, the push plate 11 will be fixed together with the sliding block 20. At the same time, when the push plate 11 approaches the fixed frame 10, the push plate 11 will also drive the insertion post 14 and the push rod 12 to move together. The insertion post 14 is connected to the pull rod 9 through the insertion slot 15. When the push rod 12 moves, it will drive the sliding rod 27 to move longitudinally in the fixed frame 13. When the sliding rod 27 moves longitudinally, it will drive the toothed post 28 to move. When the toothed post 28 moves longitudinally, it will drive the lead screw 30 to rotate through the rotating gear 31. When the lead screw 30 rotates, it will drive the shaft end baffle 7 on the pull rod hanging plate 3 to move through the moving block 32, and make the shaft end baffle 7 separate from the second pin 6. In this way, the second pin 6 can be removed from the pull rod hanging plate 3.

[0055] After the second pin 6 at the tie rod mounting plate 3 is removed, the first pin 5 at the connection between the lifting frame 4 and the tie rod 9 is pulled out, the lifting frame 4 and the tie rod 9 are separated, and then the push plate 11 is pushed laterally. The push plate 11 drives the tie rod 9 to move laterally through the plug-in pin 14. The tie rod 9 will change position. The original connection with the lifting frame 4 will move to the nearest tie rod mounting plate 3, while the original connection with the tie rod mounting plate 3 will move away and extend outward. The lifting frame 4 is then turned to the other side of the ladle body 1 by a crane or gantry crane. After the turn, the lifting frame 4 and the tie rod 9 are reconnected, and the tie rod 9 is connected to the tie rod mounting plate 3, thus completing the bidirectional steel-filling purpose of the ladle body 1. That is, after one steel-filling nozzle 8 on the ladle body 1 reaches the end of its service life, another steel-filling nozzle 8 is used after changing direction.

[0056] After the lifting frame 4, the pull rod 9, and the pull rod hanging plate 3 are reconnected, bring the two push plates 18 in the fixed frame 10 closer together. This will cause the push plate 18 to separate the limiting post 24 from the pushing post 16, and pull the pushing plate 11 outward. The pushing plate 11 will cause the insertion post 14 to separate from the pull rod 9, and at the same time, it will cause the pushing rod 12 to return to its original position in the fixed frame 13. When the pushing rod 12 moves in the opposite direction, it will cause the shaft end baffle 7 to fix the second pin 6 on the pull rod hanging plate 3, further preventing the second pin 6 from separating from the pull rod hanging plate 3.

[0057] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A tilting device for realizing bidirectional steel loading from a steel ladle, comprising a steel loading ladle body (1), characterized in that: The ladle body (1) has two symmetrically arranged steel-filling nozzles (8) at its open end. The ladle body (1) is equipped with a tilting replacement component. The tilting replacement component enables the molten steel in the ladle body (1) to flow out evenly from both sides, reducing the scouring of the steel-filling nozzle (8) on one side of the ladle body (1), thereby extending the service life of the ladle body (1). The tilting replacement assembly includes a lifting frame (4) and a pull rod (9). The lifting frame (4) can be connected to both ends of the pull rod (9) to adjust the position of the lifting frame (4) on both sides of the ladle body (1). The bottom end of the ladle body (1) is provided with a fixed frame (10) and a fixed bracket (13). The fixed frame (10) is provided with a plug-in column (14) and the pull rod (9) is provided with a plug-in groove (15). The plug-in column (14) drives the pull rod (9) to move laterally on the ladle body (1) through the plug-in groove (15), so that the pull rod (9) can adjust its direction and connect with the lifting frame (4). The fixed frame (10) is provided with a push plate (11), a movable plate (19) and a sliding block (20). The push plate (11) is provided with a push rod (12), a push column (16) and an inclined push rod (17). The push rod (12) is fixedly connected to the plug-in column (14). The push plate (11), the sliding block (20) and the movable plate (19) are distributed from top to bottom. The sliding block (20) has a connecting cavity (21), and the connecting cavity (21) is provided with a first inclined push block (22), a second inclined push block (23) and a limiting post (24). The first inclined push block (22) and the second inclined push block (23) are in contact through the inclined side, and the pushing post (16) is in contact with the first inclined push block (22). The push column (16) has a limiting groove (25), and the limiting column (24) fixes the push column (16) through the limiting groove (25). A push plate (18) is provided on the side of the limiting column (24).

2. The tilting device for realizing bidirectional steel loading in a ladle according to claim 1, characterized in that: The ladle body (1) is provided with a lifting frame hanging plate (2) and a tie rod hanging plate (3). The lifting frame (4) is provided with a pin. The lifting frame hanging plate (2) can contact the lifting frame hanging plate (2) through the pin.

3. The tilting device for realizing bidirectional steel loading in a ladle according to claim 2, characterized in that: The pull rod (9) is provided with a first pin (5) and a second pin (6). The lifting frame (4) is connected to the pull rod (9) through the first pin (5), and the pull rod hanging plate (3) is connected to the pull rod (9) through the second pin (6).

4. The tilting device for realizing bidirectional steel loading in a ladle according to claim 1, characterized in that: The bottom end of the sliding block (20) is provided with a locking block, the top end of the movable plate (19) is provided with a locking groove, and a reset spring is provided on the movable plate (19). The sliding block (20) contacts the movable plate (19) through the locking block and the locking groove, and the inclined push rod (17) contacts the movable plate (19) through the inclined surface.

5. A tilting device for realizing bidirectional steel loading in a ladle according to claim 1, characterized in that: The fixed frame (13) is provided with a spring-loaded component and a sliding rod (27). The end of the sliding rod (27) is provided with a toothed post (28). The push rod (12) slides in contact with the sliding rod (27), and the fixed frame (13) is provided with a through groove that matches the push rod (12).

6. A tilting device for realizing bidirectional steel loading in a ladle according to claim 3, characterized in that: A connecting frame (26) is provided on the pull rod hanging plate (3), a fixing plate (29) is provided in the connecting frame (26), a lead screw (30) is provided on the fixing plate (29), a rotating gear (31) and a moving block (32) are provided on the lead screw (30), a gear column (28) meshes with the rotating gear (31), and a shaft end baffle (7) is provided on the moving block (32).

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