Multistage sorting and crushing integrated solid waste treatment equipment

Abstract

The invention discloses multi-stage sorting and crushing integrated solid waste treatment equipment, and relates to general crushing, grinding or smashing. The invention relates to the technical field of cereal milling. The multistage sorting and crushing integrated solid waste treatment equipment comprises a shell, the upper side of the shell is fixedly connected with a feeding hopper, the feeding hopper communicates with the interior of the shell, the rear wall of the shell is rotationally connected with two crushing rollers, the two crushing rollers are arranged left and right, and the front ends of the two crushing rollers are rotationally connected with the front wall of the shell; transmission rods are fixedly connected to the front ends of the two crushing rollers, a transmission groove is formed in the shell, the transmission groove is formed in the front side of the front wall of the shell, the front ends of the two transmission rods rotationally extend into the transmission groove, and a screening mechanism is arranged in the shell. And therefore, the screening efficiency of the filter screen plate is not affected, and the working efficiency of the equipment is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of general crushing, grinding or pulverizing, and more particularly to a multi-stage sorting and crushing integrated solid waste treatment equipment. BACKGROUND

[0002] Solid waste refers to solid and semi-solid waste generated in human production, consumption, life and other activities. The multi-stage sorting and crushing integrated solid waste treatment equipment is a modern environmental protection equipment for comprehensive treatment of various solid wastes. It realizes efficient sorting, crushing and preliminary resource treatment of solid wastes by integrating various sorting technologies and crushing processes, and has the characteristics of high treatment efficiency, high automation degree and high resource utilization rate. It is one of the key equipment for solid waste reduction, harmless and resource treatment.

[0003] When the equipment is in use, the solid waste needs to be crushed first, and then the crushed solid waste is screened and sorted. The solid waste that meets the size requirements after crushing and the solid waste that does not meet the requirements are separated, and then the solid waste that meets the requirements is processed subsequently, and the solid waste that does not meet the requirements is crushed again. When screening, the solid waste is screened by the filter screen plate, and the larger pieces are intercepted on the filter screen plate, thereby blocking the screen holes on the filter screen plate, which reduces the screening efficiency of the filter screen plate and reduces the work efficiency. SUMMARY

[0004] The present application aims to at least solve one of the technical problems in the prior art, and provides a multi-stage sorting and crushing integrated solid waste treatment equipment, which has the function of avoiding the blockage of the screen holes of the filter screen plate by the pieces, thereby ensuring the screening efficiency of the filter screen plate and the work efficiency of the equipment.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a multi-stage sorting and crushing integrated solid waste treatment equipment, comprising an outer shell, a feed hopper fixedly connected to the upper side of the outer shell, the feed hopper being in communication with the inside of the outer shell, and two crushing rollers rotatably connected to the rear wall of the outer shell. The two crushing rollers are arranged left and right, and the front ends of the two crushing rollers are rotatably connected to the front wall of the outer shell. The front ends of the two crushing rollers are fixedly connected with transmission rods. A transmission groove is formed in the inside of the outer shell, and the transmission groove is arranged on the front side of the front wall of the outer shell. The front ends of the two transmission rods are rotatably extended into the inside of the transmission groove. A screening mechanism is arranged in the inside of the outer shell. The screening mechanism can screen the crushed solid waste, and the solid waste pieces will not affect the screening efficiency. The screening mechanism comprises a first chute, a filter screen plate, four first springs, a coarse discharge port, a second chute, a discharge plate, four second springs, a fine discharge port, a second motor assembly, four cams and four flow guide blocks.

[0006] Preferably, the front ends of the two transmission rods are rotationally connected to the front wall of the transmission groove, and the outer surfaces of the two transmission rods are fixedly sleeved with gears; The two gears are arranged in the interior of the transmission groove and are in meshing connection, and the front side of the shell is fixedly connected with a first motor assembly; The output end of the first motor assembly is fixedly connected with a first transmission shaft, the rear end of the first transmission shaft rotationally extends into the interior of the shell, and the rear end of the first transmission shaft is fixedly connected with the left transmission rod.

[0007] Preferably, the first chute is arranged in the interior of the shell, the first chute is arranged on the lower side of the two crushing rollers, and the filter screen plate is arranged in the interior of the shell; The filter screen plate is slidingly connected in the interior of the first chute, and the four first springs are fixedly connected to the top wall of the first chute; The lower end of the first spring is fixedly connected with the filter screen plate, the four first springs are arranged in a rectangular array, and the coarse discharge port is arranged on the rear side of the shell.

[0008] Preferably, the front side of the coarse discharge port extends into the interior of the shell, the coarse discharge port is in communication with the interior of the first chute, and the second chute is arranged in the interior of the shell; The second chute is arranged on the lower side of the first chute, and the discharge plate is arranged in the interior of the shell; The discharge plate is slidingly connected in the interior of the second chute, and the four second springs are fixedly connected to the bottom wall of the second chute.

[0009] Preferably, the upper end of the second spring is fixedly connected with the discharge plate, and the four second springs are arranged in a rectangular array; The fine discharge port is arranged on the front side of the shell, and the rear side of the fine discharge port extends into the interior of the shell; The fine discharge port is in communication with the interior of the second chute, and the second motor assembly is fixedly connected to the left side of the shell.

[0010] Preferably, the output end of the second motor assembly is fixedly connected with a second transmission shaft, and the right end of the second transmission shaft rotationally extends into the interior of the shell; The right end of the second transmission shaft is rotationally connected to the right wall of the shell, the four cams are fixedly sleeved on the outer surfaces of the second transmission shaft, and the four cams are arranged in a left-right array.

[0011] Preferably, the four cams can contact the filter screen plate and the discharge plate, and the four flow guide blocks are fixedly connected to the upper sides of the filter screen plate and the discharge plate, respectively. Two flow guide blocks on the filter screen plate are arranged at the position of the coarse discharge port, and two flow guide blocks on the discharge plate are arranged at the position of the fine discharge port.

[0012] Compared with the prior art, the application has the following beneficial effects: (1) The multi-stage sorting and crushing integrated solid waste treatment equipment can avoid the blockage of the screen holes of the filter screen plate by the crushed blocks, so that the screening efficiency of the filter screen plate is not affected, and the working efficiency of the equipment is ensured.

[0013] (2) The multi-stage sorting and crushing integrated solid waste treatment equipment can guide the crushed blocks to accurately discharge from the corresponding discharge port, avoid the accumulation and retention of the crushed blocks in the equipment, further improve the discharge efficiency, and make the entire sorting process more smooth. BRIEF DESCRIPTION OF DRAWINGS

[0014] The application will be further described below in combination with the drawings and embodiments: Figure 1 It is a structure schematic view of the multi-stage sorting and crushing integrated solid waste treatment equipment of the application; Figure 2 It is a cross-sectional connection structure schematic view of the crushing roller of the application; Figure 3 It is a left cross-sectional connection structure schematic view of the shell of the application; Figure 4 It is a connection structure schematic view of the inside of the shell of the application.

[0015] Reference signs: 1, shell; 2, feeding hopper; 3, crushing roller; 4, transmission rod; 5, transmission groove; 6, gear; 7, first motor assembly; 8, first transmission shaft; 9, first sliding groove; 10, filter screen plate; 11, first spring; 12, coarse discharge port; 13, second sliding groove; 14, discharge plate; 15, second spring; 16, fine discharge port; 17, second motor assembly; 18, second transmission shaft; 19, cam; 20, flow guide block. DETAILED DESCRIPTION

[0016] This part will describe the specific embodiments of the application in detail, and the preferred embodiments of the application are shown in the drawings. The drawings serve to supplement the description in the text part of the specification, so that people can intuitively and visually understand each technical feature and the overall technical solution of the application. However, it cannot be understood as a limitation on the protection scope of the application.

[0017] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by the upper, lower, front, rear, left, right and the like, is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and cannot be understood as a limitation on the present application.

[0018] In the description of the present application, greater than, less than, more than and the like are understood as not including the number, and above, below, within and the like are understood as including the number. If the first and the second are described, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0019] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting and the like should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.

[0020] Please refer to Figures 1-4 The present application provides a new technical solution: a multi-stage sorting and crushing integrated solid waste treatment equipment, comprising a shell 1, the upper side of the shell 1 is fixedly connected with a feeding hopper 2, the feeding hopper 2 is communicated with the inside of the shell 1, the rear wall of the shell 1 is rotatably connected with two crushing rollers 3, the two crushing rollers 3 are arranged left and right, the front ends of the two crushing rollers 3 are rotatably connected with the front wall of the shell 1, the front ends of the two crushing rollers 3 are fixedly connected with transmission rods 4, a transmission groove 5 is formed in the inside of the shell 1, the transmission groove 5 is arranged on the front side of the front wall of the shell 1, the front ends of the two transmission rods 4 are rotatably extended into the inside of the transmission groove 5, the front ends of the two transmission rods 4 are rotatably connected with the front wall of the transmission groove 5, the outer surfaces of the two transmission rods 4 are fixedly sleeved with gears 6, the two gears 6 are arranged in the inside of the transmission groove 5, the two gears 6 are meshingly connected, the front side of the shell 1 is fixedly connected with a first motor assembly 7, the output end of the first motor assembly 7 is fixedly connected with a first transmission shaft 8, the rear end of the first transmission shaft 8 is rotatably extended into the inside of the shell 1, the rear end of the first transmission shaft 8 is fixedly connected with the left transmission rod 4, a screening mechanism is arranged in the inside of the shell 1, the screening mechanism can screen the crushed solid waste, and the solid waste fragments will not affect the screening efficiency, the screening mechanism comprises a first chute 9, a filter screen plate 10, four first springs 11, a coarse discharge port 12, a second chute 13, a discharge plate 14, four second springs 15, a fine discharge port 16, a second motor assembly 17, four cams 19 and four flow guide blocks 20.

[0021] Further, the first sliding groove 9 is arranged in the inside of the shell 1, the first sliding groove 9 is arranged at the lower side of the two crushing rollers 3, the filter screen plate 10 is arranged in the inside of the shell 1, the filter screen plate 10 is slidably connected in the inside of the first sliding groove 9, the four first springs 11 are all fixedly connected on the top wall of the first sliding groove 9, the lower end of the first spring 11 is fixedly connected with the filter screen plate 10, the four first springs 11 are arranged in a rectangular array, the coarse discharge port 12 is arranged at the rear side of the shell 1, the front side of the coarse discharge port 12 extends into the inside of the shell 1, the coarse discharge port 12 is communicated with the inside of the first sliding groove 9, the second sliding groove 13 is arranged in the inside of the shell 1, the second sliding groove 13 is arranged at the lower side of the first sliding groove 9, the discharge plate 14 is arranged in the inside of the shell 1, the discharge plate 14 is slidably connected in the inside of the second sliding groove 13, the four second springs 15 are all fixedly connected on the bottom wall of the second sliding groove 13, the upper end of the second spring 15 is fixedly connected with the discharge plate 14, the four second springs 15 are arranged in a rectangular array, the fine discharge port 16 is arranged at the front side of the shell 1, the rear side of the fine discharge port 16 extends into the inside of the shell 1, the fine discharge port 16 is communicated with the inside of the second sliding groove 13, the second motor assembly 17 is fixedly connected at the left side of the shell 1, the output end of the second motor assembly 17 is fixedly connected with the second transmission shaft 18, the right end of the second transmission shaft 18 rotatably extends into the inside of the shell 1, the right end of the second transmission shaft 18 is rotatably connected on the right wall of the shell 1, the four cams 19 are all fixedly sleeved on the outer surface of the second transmission shaft 18, the four cams 19 are arranged in left and right arrangement, the four cams 19 can be contacted with the filter screen plate 10 and the discharge plate 14, the four flow guide blocks 20 are respectively fixedly connected at the upper side of the filter screen plate 10 and the discharge plate 14, the two flow guide blocks 20 on the filter screen plate 10 are arranged at the position of the coarse discharge port 12, the two flow guide blocks 20 on the discharge plate 14 are arranged at the position of the fine discharge port 16.

[0022] Further, the solid waste is put into the inside of the equipment shell 1 through the feeding hopper 2, the first motor assembly 7 is started, the first motor assembly 7 drives the first transmission shaft 8 to rotate, the first transmission shaft 8 drives the left transmission rod 4 to rotate, since the two gear wheels 6 fixedly connected at the front ends of the two transmission rods 4 are meshed with each other in the transmission groove 5, when the left transmission rod 4 rotates, the right transmission rod 4 is driven to rotate reversely through the gear wheel 6, so that the two crushing rollers 3 relatively rotate, and the entering solid waste is crushed, the crushed solid waste pieces fall onto the filter screen plate 10, at this time, the second motor assembly 17 is started, the second motor assembly 17 drives the second transmission shaft 18 to rotate, the second transmission shaft 18 drives the four cams 19 fixedly sleeved on the outer surface thereof to rotate, when the cam 19 rotates to contact the filter screen plate 10, the filter screen plate 10 is pushed to slide upward in the first sliding groove 9, and the first spring 11 is compressed, when the cam 19 rotates to leave the filter screen plate 10, under the elastic force of the first spring 11, the filter screen plate 10 resets downward, so repeatedly, the filter screen plate 10 generates up-down vibration, and the screening of the solid waste pieces is accelerated, the pieces with a particle size greater than the mesh of the filter screen plate 10 are left on the filter screen plate 10, and under the vibration, the pieces are guided through the flow guide block 20 on the filter screen plate 10, and are discharged from the equipment through the coarse discharge port 12.

[0023] The pieces with a particle size smaller than the mesh of the filter screen plate 10 fall through the filter screen plate 10 and fall onto the discharge plate 14, and similarly, with the rotation of the cam 19, when the cam 19 rotates to contact the discharge plate 14, the discharge plate 14 is pushed to slide downward in the second sliding groove 13, and the second spring 15 is compressed, when the cam 19 rotates to leave the discharge plate 14, under the elastic force of the second spring 15, the discharge plate 14 resets upward, so that the discharge plate 14 also generates up-down vibration, and the pieces with a smaller particle size on the discharge plate 14 move to the front side under the vibration, and then are guided through the flow guide block 20 on the discharge plate 14, and are discharged from the equipment through the fine discharge port 16.

[0024] Further, in this way, the mesh of the filter screen plate 10 can be prevented from being blocked by the pieces, the screening efficiency of the filter screen plate 10 is not affected, and the working efficiency of the equipment is ensured.

[0025] Structural description: The shell 1 is the main structure of the equipment, provides mounting space and protection for the internal components, plays a supporting and protecting role, and enables the internal components of the equipment to stably operate and not be disturbed by the outside world.

[0026] The feeding hopper 2 is fixedly connected to the upper side of the shell 1, is connected to the inside of the shell 1, is the entrance of the solid waste into the equipment, and facilitates the solid waste to be put into the inside of the equipment.

[0027] Crushing roller 3: crushing roller 3 has two, set left and right, rotatingly connected on the rear wall and the front wall of the shell 1, crushing the solid waste entering by relative rotation, crushing the large solid waste into small pieces.

[0028] Transmission rod 4: transmission rod 4 has two, respectively fixedly connected with the front ends of the two crushing rollers 3, the front ends rotatingly extending into the transmission groove 5 and being connected on the front wall of the transmission groove 5, for transmitting power to the crushing roller 3, so that the crushing roller 3 can rotate.

[0029] Transmission groove 5: transmission groove 5 is opened on the front side of the front wall of the shell 1, providing space for the installation and meshing of the gear 6, ensuring that the gear 6 can normally transmit power.

[0030] Gear 6: gear 6 has two, respectively fixedly sleeved on the outer surfaces of the two transmission rods 4, arranged in the transmission groove 5 and meshing with each other, through gear transmission, when one transmission rod 4 rotates, the other transmission rod 4 can be driven to rotate in the opposite direction, so as to realize the relative rotation of the two crushing rollers 3.

[0031] First motor assembly 7: fixedly connected on the front side of the shell 1, the output end fixedly connected with the first transmission shaft 8, providing power for the rotation of the crushing roller 3, after starting, driving the first transmission shaft 8 to rotate.

[0032] First transmission shaft 8: the rear end rotatingly extends into the shell 1 and is fixedly connected with the left transmission rod 4, transmitting power of the first motor assembly 7 to the left transmission rod 4, and then driving the crushing roller 3 to rotate.

[0033] First sliding groove 9: first sliding groove 9 is opened in the shell 1, arranged on the lower side of the two crushing rollers 3, providing a sliding track for the filter screen 10, so that the filter screen 10 can slide up and down in it.

[0034] Filter screen 10: filter screen 10 is arranged in the shell 1, slidingly connected in the first sliding groove 9, used for screening the crushed solid waste pieces, the pieces with particle size larger than the mesh are left on the screen, and the pieces with particle size smaller than the mesh fall through the mesh.

[0035] First spring 11: first spring 11 has four, arranged in a rectangular array, fixedly connected on the top wall of the first sliding groove 9, the lower end fixedly connected with the filter screen 10, when the cam 19 pushes the filter screen 10 to slide upward, the first spring 11 is compressed; when the cam 19 leaves the filter screen 10, the elastic force of the first spring 11 makes the filter screen 10 reset downward, so as to produce up and down vibration, accelerating screening.

[0036] Coarse discharge port 12: opened in the rear side of the shell 1, the front side extends into the shell 1 inside and communicates with the inside of the first chute 9, used to discharge the block size larger than the filter screen plate 10 mesh, under the action of the vibration of the filter screen plate 10, these blocks are guided from the coarse discharge port 12 by the guide block 20.

[0037] Second chute 13: opened in the inside of the shell 1, arranged at the lower side of the first chute 9, provides sliding track for the discharge plate 14, so that the discharge plate 14 can slide up and down in it.

[0038] Discharge plate 14: arranged in the inside of the shell 1, slidingly connected in the inside of the second chute 13, further separates and transports the block passing through the filter screen plate 10, generates up and down vibration under the action of the cam 19.

[0039] Second spring 15: there are four second springs 15, arranged in a rectangular array, fixedly connected on the bottom wall of the second chute 13, the upper end is fixedly connected with the discharge plate 14, when the cam 19 leaves the discharge plate 14, the discharge plate 14 is reset upward by the elastic force, to ensure the vibration effect of the discharge plate 14.

[0040] Fine discharge port 16: opened in the front side of the shell 1, the rear side extends into the shell 1 inside and communicates with the inside of the second chute 13, used to discharge the smaller block size on the discharge plate 14, under the guidance of the guide block 20, the block is discharged from the fine discharge port 16 of the equipment.

[0041] Second motor assembly 17: fixedly connected on the left side of the shell 1, the output end is fixedly connected with the second transmission shaft 18, provides power for the rotation of the cam 19, drives the cam 19 to rotate, so as to realize the vibration of the filter screen plate 10 and the discharge plate 14.

[0042] Second transmission shaft 18: the right end extends into the inside of the shell 1 and is rotatably connected on the right wall of the shell 1, rotates under the driving of the second motor assembly 17, and in turn drives the cam 19 fixedly sleeved on the outer surface thereof to rotate.

[0043] Cam 19: there are four cams 19, arranged in left and right rows, fixedly sleeved on the outer surface of the second transmission shaft 18, can contact with the filter screen plate 10 and the discharge plate 14, pushes the filter screen plate 10 and the discharge plate 14 to slide up and down by rotating, realizes vibration screening.

[0044] Guide block 20: fixedly connected on the upper side of the filter screen plate 10 and the discharge plate 14 respectively, two guide blocks 20 on the filter screen plate 10 are arranged at the position of the coarse discharge port 12, two guide blocks 20 on the discharge plate 14 are arranged at the position of the fine discharge port 16, used to guide the block to discharge from the corresponding discharge port, to avoid block accumulation.

[0045] The embodiments of the present application are described in detail above with reference to the drawings, but the present application is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application.

Claims

1. A multi-stage sorting and crushing integrated solid waste treatment equipment, comprising a shell (1), the upper side of the shell (1) is fixedly connected with a feeding hopper (2), the feeding hopper (2) is communicated with the inside of the shell (1), and the rear wall of the shell (1) is rotatably connected with two crushing rollers (3); The two crushing rollers (3) are arranged left and right, the front ends of the two crushing rollers (3) are rotatably connected with the front wall of the shell (1), and the front ends of the two crushing rollers (3) are fixedly connected with transmission rods (4); The inside of the shell (1) is provided with a transmission groove (5), the transmission groove (5) is arranged at the front side of the front wall of the shell (1), the front ends of the two transmission rods (4) are both rotationally extended into the inside of the transmission groove (5), characterized in that: The inside of the shell (1) is provided with a screening mechanism, the crushed solid waste can be screened through the screening mechanism, and the solid waste fragments do not affect the screening efficiency; The screening mechanism comprises a first chute (9), a filter screen plate (10), four first springs (11), a coarse discharge port (12), a second chute (13), a discharge plate (14), four second springs (15), a fine discharge port (16), a second motor assembly (17), four cams (19) and four flow guide blocks (20).

2. The multi-stage sorting and crushing integrated solid waste treatment device according to claim 1, characterized in that: The front ends of the two transmission rods (4) are rotatably connected to the front wall of a transmission groove (5), and the outer surfaces of the two transmission rods (4) are fixedly sleeved with gears (6); The two gears (6) are arranged in the inside of the transmission groove (5) and are meshedly connected, and the front side of the shell (1) is fixedly connected with a first motor assembly (7); The output end of the first motor assembly (7) is fixedly connected with a first transmission shaft (8), the rear end of the first transmission shaft (8) rotatably extends into the inside of the shell (1), and the rear end of the first transmission shaft (8) is fixedly connected with the left transmission rod (4).

3. The multi-stage sorting and crushing integrated solid waste treatment device according to claim 1, characterized in that: The first chute (9) is arranged in the inside of the shell (1) and is arranged below the two crushing rollers (3), and the filter screen plate (10) is arranged in the inside of the shell (1); The filter screen plate (10) is slidably connected in the inside of the first chute (9), and the four first springs (11) are fixedly connected to the top wall of the first chute (9); The lower end of the first spring (11) is fixedly connected with the filter screen plate (10), the four first springs (11) are arranged in a rectangular array, and the coarse discharge port (12) is arranged on the rear side of the shell (1).

4. The multi-stage sorting and crushing integrated solid waste treatment apparatus according to claim 3, characterized in that: The front side of the coarse discharge port (12) extends into the inside of the shell (1), the coarse discharge port (12) is communicated with the inside of the first chute (9), and the second chute (13) is arranged in the inside of the shell (1); The second chute (13) is arranged below the first chute (9), and the discharge plate (14) is arranged in the inside of the shell (1); The discharge plate (14) is slidably connected in the inside of the second chute (13), and the four second springs (15) are fixedly connected to the bottom wall of the second chute (13).

5. The multi-stage sorting and crushing integrated solid waste disposal apparatus according to claim 4, characterized in that: The upper end of the second spring (15) is fixedly connected with the discharge plate (14), and the four second springs (15) are arranged in a rectangular array; The fine discharge port (16) is arranged on the front side of the shell (1), and the rear side of the fine discharge port (16) extends into the inside of the shell (1); The fine discharge port (16) is communicated with the inside of the second chute (13), and the second motor assembly (17) is fixedly connected to the left side of the shell (1).

6. The multi-stage sorting and crushing integrated solid waste disposal apparatus according to claim 5, characterized in that: The output end of the second motor assembly (17) is fixedly connected with a second transmission shaft (18), and the right end of the second transmission shaft (18) extends into the inside of the shell (1) in a rotating mode; The right end of the second transmission shaft (18) is rotatably connected to the right wall of the shell (1), and four cams (19) are fixedly sleeved on the outer surface of the second transmission shaft (18) and arranged in left and right rows.

7. The multi-stage sorting and crushing integrated solid waste disposal apparatus according to claim 6, characterized in that: The four cams (19) can be in contact with the filter screen plate (10) and the discharge plate (14), and four flow guide blocks (20) are fixedly connected to the upper sides of the filter screen plate (10) and the discharge plate (14) respectively; Two flow guide blocks (20) on the filter screen plate (10) are arranged at the positions of the coarse discharge ports (12), and two flow guide blocks (20) on the discharge plate (14) are arranged at the positions of the fine discharge ports (16).

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