Artemisia clearance crushing device based on mechanical crushing and resource utilization

Abstract

The utility model discloses a wormwood clearance smashing device based on mechanical smashing and resource utilization, belongs to the technical field of smashing, and aims to solve the problems that existing equipment is uneven in smashing, high in energy consumption and poor in operation flexibility, and impurities are difficult to separate. The device comprises a rack, a crushing box, a top cover, a cover plate, a driving shaft, a driven shaft, a crushing assembly, a sliding load bearing box, a hammering assembly, a protective shell and a servo motor, the servo motor drives multiple components to operate cooperatively through a synchronous belt, a chain wheel and a chain, a conveying belt conveys wormwood, a pressing roller conducts self-adaptive gap hammering and impurity removing, a cutting knife and a crushing knife conduct graded crushing, and screening is conducted through a screening plate. The bottom of the rack is provided with the brake universal wheels so that movement can be facilitated, the protective cover and the protective shell are safe in lifting operation, the overall structure is compact, materials with uniform particle sizes can be produced, and the device is suitable for recycling pre-crushing operation after field wormwood is removed.

Description

Technical Field

[0001] This utility model relates to the field of pulverization technology, and in particular to a pulverizing device for wormwood removal based on mechanical pulverization and resource utilization. Background Technology

[0002] As a widely distributed wild plant, wormwood can easily encroach on the growing space of crops and disrupt the ecological balance in some areas due to over-propagation. Furthermore, its dried form poses a fire hazard, thus requiring timely removal. Removed wormwood has resource utilization value and can be used as feed, fertilizer, or biomass energy. Crushing is a necessary preliminary step to achieve these resource utilization pathways.

[0003] Existing wormwood crushing equipment mostly adopts a single crushing structure, processing wormwood only through cutting or crushing. This results in low crushing efficiency and uneven particle size, making it difficult to meet the particle size requirements for subsequent resource utilization. Although some equipment adds a pre-treatment mechanism, each mechanism is driven independently, which not only leads to high energy consumption but also results in a large overall size and complex operation, making it unsuitable for flexible use in complex scenarios such as fields.

[0004] Meanwhile, during the removal of wormwood, impurities such as dust and small stones are easily mixed in. Existing equipment lacks a targeted impurity separation mechanism, and these impurities enter the crushing mechanism along with the wormwood. This not only accelerates blade wear and shortens equipment lifespan but also affects the purity of the crushed material, reducing its resource utilization value. In addition, improper coordination between the hammering and conveying mechanisms in some equipment can easily lead to material congestion or insufficient hammering force, further restricting processing efficiency and failing to meet the continuous crushing requirements after large-scale wormwood removal. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing wormwood crushing equipment, such as low crushing efficiency, uneven particle size, improper coordination between the hammer and conveying mechanisms, which can easily lead to material blockage or insufficient hammering force. Therefore, this invention proposes a wormwood removal material crushing device based on mechanical crushing and resource utilization.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A wormwood removal pulverizing device based on mechanical pulverization and resource utilization includes a frame, a pulverizing box fixedly mounted on the top of the frame, a top cover fixedly mounted on the top of the pulverizing box, and a cover plate bolted to one end of the pulverizing box; a drive shaft and a driven shaft rotatably pass through the pulverizing box, and a pulverizing assembly is provided on the outside; a sliding load box is slidably mounted inside the top cover, and a hammering assembly is provided at the bottom of the sliding load box; a protective shell is fixedly mounted inside the frame, and a servo motor is fixedly mounted inside the protective shell, the output shaft of which is connected to the drive shaft via a synchronous belt drive to drive the pulverizing assembly and the hammering assembly to work together to pulverize the wormwood; a common rotating rod is rotatably connected between the two inner walls of the pulverizing box.

[0008] In one possible design, the crushing chamber is equipped with a conveying assembly, which includes two round rods I rotatably mounted on the inner wall of the crushing chamber. The outer walls of the round rods I are fixedly fitted with conveying rollers, and the outer walls of the two conveying rollers are driven by the same conveyor belt, which stably conveys the wormwood to the hammering and crushing area.

[0009] In one possible design, the crushing assembly includes multiple cutting blades fixed to the outer wall of the drive shaft and a mounting cylinder fixed to the outer wall of the driven shaft. Multiple crushing blades are fixed to the outer wall of the mounting cylinder, and a sieve plate is bolted to the bottom of the cover plate. The drive shaft drives the cutting blades to initially cut the grass, and the crushing blades further crush it. After being screened by the sieve plate, qualified material is discharged.

[0010] In one possible design, the hammering assembly includes multiple sets of fixed T-shaped rods fixed to the inner wall of the top of the sliding load box. Guide blocks are slidably sleeved on the outer wall of each set of two fixed T-shaped rods. The two guide blocks are rotatably connected to the same pressure roller. A side plate is fixed to the side of the sliding load box near the rotating rod. The pressure roller can move along the fixed T-shaped rods to adaptively adjust the gap.

[0011] In one possible design, a circular rod II is rotatably inserted inside the crushing chamber. Both the circular rod II and the outer wall of the rotating rod are fixedly fitted with sprockets I. The outer wall of the circular rod II and a circular rod I near the rotating rod are also fixedly fitted with sprockets II. The sprockets in the same group are connected by chain drive to realize multi-path power transmission.

[0012] In one possible design, multiple eccentric plates are fixedly mounted on the outer wall of the rotating rod. The eccentric plates cooperate with the side plates to push the sliding load box to move up and down. The drive shaft is connected to the rotating rod and the driven shaft respectively through synchronous belt transmission to ensure that the operation of each component is synchronized.

[0013] In one possible design, the four corners of the bottom of the frame are fixed with casters with brakes, and the two sides of the frame are fixed with protective covers. The casters with brakes facilitate the movement and positioning of the equipment, and the protective covers provide safety protection.

[0014] In one possible design, a guide roller is fixed to the outer wall of the round rod II. The guide roller guides the wormwood conveyed by the conveyor belt to the cutting blade, ensuring that the wormwood accurately enters the cutting area and improving the crushing efficiency.

[0015] In one possible design, the crushing box is provided with an inclined bottom plate and a discharge hole at the bottom. A discharge box is installed below the discharge hole, and the impurities generated by the hammering are discharged along the inclined bottom plate through the discharge hole to the discharge box.

[0016] In this application, during use, the wormwood is conveyed into the crushing box through the top side of the crushing box. The servo motor is started, and the output shaft of the servo motor drives the drive shaft to rotate through the synchronous belt and synchronous pulley. The drive shaft drives the rotating rod and the driven shaft to rotate through the synchronous pulley and synchronous belt. The rotating rod drives the round rod I and round rod II to rotate through sprocket I and sprocket II and the externally sleeved chain. The round rod I drives the conveyor roller to rotate, and the conveyor roller drives the conveyor belt to convey forward. The conveyor belt carries the wormwood at the top forward.

[0017] Furthermore, when the rotating rod rotates, it drives the eccentric plate to rotate, which in turn drives the side plate to move upward. The side plate then drives the sliding load box to move upward, which in turn drives the multiple pressure rollers and the fixed T-shaped rod inside to move upward as a whole. After the side plate separates from the eccentric plate, the pressure rollers and the sliding load box move downward under the action of gravity, which can then hammer the grass. The pressure rollers can also move up and down on the surface of the fixed T-shaped rod as a whole, preventing the gap between the pressure rollers and the conveyor belt from being too small, which would affect the conveying of the grass. This helps to remove surface dust and stones, which are then discharged along the inclined surface of the inclined bottom plate through the discharge hole and discharge box.

[0018] Furthermore, the drive shaft can drive multiple cutting blades to rotate, and the round rod II drives the guide roller to rotate. The guide roller guides the wormwood to one side of the cutting blade. The cutting blade performs preliminary cutting on the wormwood. After cutting, it is further crushed by the crushing blade. After being crushed into small pieces, it is discharged through the sieve plate.

[0019] Beneficial effects: 1. This utility model provides a single power source through a servo motor, and uses a synchronous belt, synchronous pulley, and chain transmission structure to drive the drive shaft, driven shaft, rotating rod, and round rod I and round rod II to operate synchronously, realizing the linkage operation of multiple processes such as conveying, hammering, and crushing. It eliminates the need for multiple independent drive components, effectively simplifying the overall structure, reducing energy consumption, ensuring the coordinated operation of each mechanism, avoiding process interruptions, and improving continuous operation capability.

[0020] 2. In this utility model, the sliding load box cooperates with the eccentric plate and the side plate to drive the pressure roller to achieve up-and-down reciprocating hammering action. During the hammering process, the pressure roller can move flexibly along the fixed T-shaped rod, which can not only fully pound and loosen the grass by gravity, but also adaptively adjust the gap between it and the conveyor belt to avoid hindering the material conveying due to the gap being too small. At the same time, it facilitates the removal of dust, stones and other impurities from the grass, which are discharged along the inclined bottom plate through the discharge hole and discharge box, thereby improving the purity of the crushed material and reducing the impact of impurities on subsequent processes and equipment components.

[0021] 3. In this invention, the cutting blade on the drive shaft and the crushing blade on the driven shaft form a graded crushing structure. The cutting blade first performs preliminary cutting of the wormwood, shortening its length, and then the crushing blade further refines it. Combined with the screening effect of the sieve plate, this ensures that the crushed material has a uniform particle size, meeting the particle size requirements for subsequent resource utilization. The graded crushing method reduces the workload of a single blade, minimizes blade wear, and extends the equipment's service life.

[0022] 4. The bottom of the frame of this utility model is equipped with universal wheels with brakes, which facilitates the movement of the equipment in complex scenarios such as fields. The working location can be adjusted according to the distribution of grass, thus improving the applicability of the equipment. The protective covers and protective shells on both sides of the frame can protect the transmission components and motor, preventing foreign objects from being caught in or personnel from being accidentally injured during operation, thereby improving the safety of equipment operation.

[0023] 5. The cover plate of this utility model adopts a detachable connection method, which facilitates the inspection, replacement and cleaning of the blades, screen plates and other components inside the crushing box, reducing the difficulty of equipment maintenance; the conveyor belt and guide roller work together to realize the stable conveying of grass, ensuring that the material enters the hammering and crushing area and avoiding material spillage. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural schematic diagram of a wormwood removal material pulverizing device based on mechanical pulverization and resource utilization proposed in this utility model;

[0025] Figure 2 A three-dimensional image of a wormwood removal pulverizing device based on mechanical pulverization and resource utilization proposed in this utility model, showing the removal of the top cover;

[0026] Figure 3 This is a three-dimensional cross-sectional view of the crushing box in a wormwood removal material crushing device based on mechanical crushing and resource utilization proposed in this utility model.

[0027] Figure 4 This is an exploded view of the conveyor belt and inclined bottom plate in a wormwood removal pulverizing device based on mechanical pulverization and resource utilization proposed in this utility model.

[0028] In the diagram: 1. Frame; 2. Protective shell; 3. Protective cover; 4. Cover plate; 5. Top cover; 6. Crushing box; 7. Conveyor belt; 8. Sliding load box; 9. Rotating rod; 10. Cutting blade; 11. Crushing blade; 12. Screen plate; 13. Driven shaft; 14. Drive shaft; 15. Servo motor; 16. Mounting cylinder; 17. Conveying roller; 18. Discharge box; 19. Universal wheel with brake; 20. Fixed T-shaped rod; 21. Guide block; 22. Round rod I; 23. Inclined bottom plate; 24. Discharge hole; 25. Sprocket I; 26. Round rod II; 27. Sprocket II; 28. Guide roller; 29. ​​Eccentric plate; 30. Side plate; 31. Pressure roller. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0030] In one embodiment: Refer to Figure 1-4 A crushing device is disclosed, with a frame 1 as the mounting base. Four corners of the frame 1 are fixedly equipped with braked casters 19, allowing the device to be flexibly moved to the field weeding area. Once moved to the target position, the braking mechanism is locked to position the device, meeting the adjustment needs of different work locations. Protective covers 3 are fixedly installed on both sides of the frame 1, and a protective shell 2 is fixedly installed inside the frame 1. The protective shell 2 protects the internal drive components, while the protective cover 3 shields the external transmission structure. To ensure safety during operation and prevent foreign objects from being caught or personnel from accidentally touching and injuring themselves, the protective shell 2 and protective cover 3 work together to form a comprehensive protection system. Specifically, the protective shell 2 is fixed to the inner wall of the frame 1 by welding, and the protective cover 3 is detachably connected to the side of the frame 1 by screws, facilitating subsequent maintenance of the internal components.

[0031] A crushing box 6 is fixedly installed on the top of the frame 1, and a top cover 5 is fixedly installed on the top of the crushing box 6. One end of the crushing box 6 is detachably connected to a cover plate 4 by screws. Preferably, the cover plate 4 is made of stainless steel, which has good wear resistance and corrosion resistance and can adapt to the damp and dusty working environment in the field. A conveying assembly is set inside the crushing box 6 to achieve stable conveying of wormwood. Specifically, the conveying assembly includes two round rods I 22 rotatably connected to the inner wall of the crushing box 6. A conveying roller 17 is fixedly sleeved on the outer wall of the round rods I 22. The same conveyor belt 7 is driven to be sleeved on the outer wall of the two conveyor rollers 17. When the round rods I 22 rotate, they drive the conveyor rollers 17 to rotate synchronously. The conveyor rollers 17 drive the conveyor belt 7 to convey forward in the horizontal direction, thereby moving the wormwood placed on the top of the conveyor belt 7 towards the crushing area.

[0032] The internal rotation of the crushing chamber 6 extends through the drive shaft 14 and the driven shaft 13, which are connected by a synchronous belt and synchronous pulley to ensure matching operating speeds. A crushing assembly is installed outside the drive shaft 14 and the driven shaft 13 for grading and crushing the wormwood. Specifically, the crushing assembly includes multiple cutting blades 10 fixedly mounted on the outer wall of the drive shaft 14 and a mounting cylinder 16 fixedly mounted on the outer wall of the driven shaft 13. Multiple crushing blades 11 are fixedly mounted on the outer wall of the mounting cylinder 16. A sieve plate 12 is detachably connected to one side of the bottom of the cover plate 4 via screws. The sieve plate 12 is used to screen the crushed wormwood to ensure that the discharged material meets the particle size requirements. Preferably, the cutting blades 10 are made of alloy steel, possessing high hardness and wear resistance, effectively handling the cutting of wormwood. Furthermore, a circular rod II 26 rotates through the internal rotation of the crushing chamber 6. A guide roller 28 is fixedly mounted on the outer wall of the circular rod II 26. The guide roller 28 guides the wormwood conveyed by the conveyor belt 7 towards the cutting blades 10, ensuring that the wormwood accurately enters the cutting area.

[0033] The sliding load box 8 is slidably connected between the inner walls of the two sides of the top cover 5 via a slider and a slide rail. The cooperation of the slider and the slide rail allows the sliding load box 8 to move stably in the vertical direction. A hammering assembly is set at the bottom of the sliding load box 8 for hammering and loosening the grass. Specifically, the hammering assembly includes multiple sets of fixed T-shaped rods 20 fixedly installed on the inner wall of the top of the sliding load box 8. Each set of fixed T-shaped rods 20 consists of two rods. Guide blocks 21 are slidably fitted on the outer wall of the fixed T-shaped rods 20. The two guide blocks 21 are rotatably connected to the same pressure roller 31. A side plate 30 is fixedly installed on the side of the sliding load box 8 closest to the rotating rod 9. Based on this, the pressure roller 31 can move up and down along the outer wall of the fixed T-shaped rods 20, adaptively adjusting the gap between itself and the conveyor belt 7 to avoid the gap being too small and hindering the conveying of grass, while also facilitating the removal of dust, stones and other impurities from the grass.

[0034] A servo motor 15 is fixedly installed on one side of the inner wall of the protective shell 2. The output shaft of the servo motor 15 rotates through the protective shell 2. The outer wall of the drive shaft 14 and the output shaft of the servo motor 15 are connected by a synchronous belt and a synchronous pulley, providing power support for the drive shaft 14. The drive shaft 14 and the rotating rod 9 are connected by a synchronous belt and a synchronous pulley. Multiple eccentric plates 29 are fixedly sleeved on the outer wall of the rotating rod 9. The eccentric plates 29 cooperate with the side plate 30 and are used to push the side plate 30 upward. Furthermore, sprockets I 25 are fixedly installed on the outer wall of the round rod II 26 and the outer wall of the rotating rod 9. Sprockets II 27 are fixedly installed on the outer wall of the round rod II 26 and the outer wall of the round rod I 22 near the rotating rod 9. The outer walls of the two sprockets I 25 and the two sprockets II 27 are all driven by the same chain, realizing multi-path power transmission.

[0035] In actual operation, the wormwood is placed into the crushing box 6 through the top side of the crushing box 6, so that the wormwood falls on the top of the conveyor belt 7. The servo motor 15 is started. The output shaft of the servo motor 15 drives the drive shaft 14 to rotate through the synchronous belt and synchronous pulley. The drive shaft 14 drives the rotating rod 9 and the driven shaft 13 to rotate through the synchronous pulley and synchronous belt. When the rotating rod 9 rotates, on the one hand, it drives the round rods I22 and II26 to rotate through the sprockets I25, II27 and the externally sleeved chain. The round rod I22 drives the conveyor roller 17 to rotate, and the conveyor roller 17 drives the conveyor belt 7 to move forward, thereby moving the top grass towards the hammering and crushing area. On the other hand, it drives the eccentric plate 29 to rotate synchronously. When the eccentric plate 29 rotates to contact the side plate 30, it pushes the side plate 30 to move upward. The side plate 30 drives the sliding load box 8 to move upward along the slider and slide rail. The sliding load box 8 drives the multiple pressure rollers 31 and the fixed T-shaped rod 20 inside to move upward as a whole. When the side plate 30 is separated from the eccentric plate 29, the pressure rollers 31 and the sliding load box 8 move downward under the action of gravity, hammering and loosening the grass on the conveyor belt 7. During the hammering process, impurities are discharged through the discharge hole 24 and discharge box 18 along the inclined surface of the inclined bottom plate 23 inside the crushing box 6.

[0036] Simultaneously, the drive shaft 14 drives multiple cutting blades 10 to rotate, and the round rod II 26 drives the guide roller 28 to rotate. The guide roller 28 guides the hammered wormwood towards one side of the cutting blade 10. The cutting blade 10 performs preliminary cutting on the wormwood, shortening its length. The cut wormwood falls into the area of ​​the crushing blade 11. The driven shaft 13 drives the mounting cylinder 16 and the crushing blade 11 to rotate, further crushing the wormwood. The crushed wormwood is discharged from the crushing box 6 after being screened by the sieve plate 12, completing the entire crushing process. Based on this, the sieve plate 12, cutting blades 10, and crushing blade 11 can be cleaned or replaced by disassembling the cover plate 4 to ensure long-term stable operation of the equipment.

[0037] This application can be used in the field of Artemisia, or in other fields applicable to this application.

[0038] In another embodiment: Reference Figure 1-4 This invention discloses a wormwood removal material pulverizing device based on mechanical pulverization and resource utilization, applicable in the field of wormwood. The structure of this embodiment is basically the same as the aforementioned embodiments, the difference being that the installation density of the cutting blades 10 and pulverizing blades 11 can be adjusted according to the wormwood pulverization requirements. By increasing or decreasing the number of cutting blades 10 and pulverizing blades 11, the device can adapt to pulverization requirements of different particle sizes, further improving its applicability. Preferably, the slide rail is made of wear-resistant plastic material, which can reduce friction during the sliding process of the slider, reduce component wear, and extend the service life of the equipment.

[0039] It also includes a PLC controller and a control panel. The PLC controller is electrically connected to the servo motor 15 and the control panel to control the start and stop of the servo motor 15 and adjust its speed, thereby synchronously controlling the operating rhythm of the drive shaft 14, driven shaft 13, rotating rod 9 and conveying components to ensure coordinated operation of the hammering, conveying and crushing processes.

[0040] However, as is well known to those skilled in the art, the working principle and wiring method of the servo motor 15 are conventional means or common knowledge, and will not be described in detail here. Those skilled in the art can make any selection according to their needs or convenience.

[0041] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A pulverizing device for wormwood removal materials based on mechanical pulverization and resource utilization, characterized in that, include: A frame (1) is fixedly mounted on the top of the frame (1), and a top cover (5) is fixedly mounted on the top of the crushing box (6). A cover plate (4) is detachably connected to one end of the crushing box (6). The crushing box (6) is equipped with a drive shaft (14) and a driven shaft (13) that rotate through it. The crushing assembly is provided on the outside. The top cover (5) is equipped with a sliding load box (8). The bottom of the sliding load box (8) is equipped with a hammering assembly. The frame (1) is fitted with a protective shell (2), and the protective shell (2) is fitted with a servo motor (15). Its output shaft is connected to the drive shaft (14) by a synchronous belt drive, driving the crushing component and the hammering component to work together to crush the grass. The two inner walls of the crushing box (6) are rotatably connected by the same rotating rod (9).

2. The wormwood removal material pulverizing device based on mechanical pulverization and resource utilization according to claim 1, characterized in that, The crushing box (6) is equipped with a conveying assembly, which includes two round rods I (22) rotatably mounted on the inner wall of the crushing box (6). The outer wall of the round rods I (22) is fixedly fitted with conveying rollers (17). The outer walls of the two conveying rollers (17) are driven by the same conveyor belt (7). The wormwood is stably conveyed to the hammering and crushing area through the conveyor belt (7).

3. The wormwood removal material pulverizing device based on mechanical pulverization and resource utilization according to claim 1, characterized in that, The crushing assembly includes a plurality of cutting blades (10) fixed to the outer wall of the drive shaft (14) and a mounting cylinder (16) fixed to the outer wall of the driven shaft (13). A plurality of crushing blades (11) are fixed to the outer wall of the mounting cylinder (16), and the bottom of the cover plate (4) is bolted to the screen plate (12).

4. The wormwood removal material pulverizing device based on mechanical pulverization and resource utilization according to claim 1, characterized in that, The hammering assembly includes multiple sets of fixed T-shaped rods (20) fixed to the inner wall of the top of the sliding load box (8). Each set of two fixed T-shaped rods (20) has a guide block (21) slidably sleeved on the outer wall. The two guide blocks (21) are rotatably connected to the same pressure roller (31). The side plate (30) is fixedly installed on the side of the sliding load box (8) near the rotating rod (9). The pressure roller (31) can move along the fixed T-shaped rods (20) to adaptively adjust the gap.

5. A wormwood removal material pulverizing device based on mechanical pulverization and resource utilization according to any one of claims 1 to 4, characterized in that, A round rod II (26) is rotatably inserted inside the crushing box (6). Both the round rod II (26) and the outer wall of the rotating rod (9) are fixedly fitted with sprockets I (25). The outer wall of the round rod II (26) and a round rod I (22) near the rotating rod (9) are fixedly fitted with sprockets II (27). The sprockets in the same group are connected by chain drive to realize multi-path power transmission.

6. The wormwood removal material pulverizing device based on mechanical pulverization and resource utilization according to claim 5, characterized in that, The outer wall of the rotating rod (9) is fitted with multiple eccentric plates (29). The eccentric plates (29) cooperate with the side plate (30) to push the sliding load box (8) to move up and down. The drive shaft (14) is connected to the rotating rod (9) and the driven shaft (13) respectively through synchronous belt transmission to ensure that the operation of each component is synchronized.

7. The wormwood removal material pulverizing device based on mechanical pulverization and resource utilization according to claim 1, characterized in that, The frame (1) is fixedly equipped with braked casters (19) at the four corners of the bottom, and the frame (1) is fixedly equipped with protective covers (3) on both sides.

8. The wormwood removal material pulverizing device based on mechanical pulverization and resource utilization according to claim 5, characterized in that, The outer wall of the round rod II (26) is fixed with a guide roller (28), which guides the grass cutting blade (10) conveyed by the conveyor belt (7).

9. A wormwood removal material pulverizing device based on mechanical pulverization and resource utilization according to any one of claims 1 to 4, characterized in that, The crushing box (6) is provided with an inclined bottom plate (23) and a discharge hole (24) at the bottom. A discharge box (18) is installed below the discharge hole (24). Impurities generated by hammering are discharged along the inclined bottom plate (23) through the discharge hole (24) to the discharge box (18).

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