Stable double-roller crusher with wear-resistant rollers

Abstract

The utility model relates to the field of roll crushers, in particular to a stable roll crusher with wear-resistant rolls, which comprises a lower shell, a rolling component is rotatably arranged in the lower shell, a cleaning plate component used for cleaning residual ores stuck on the rolling component is arranged at the bottom of the rolling component, and the wear-resistant rolls are arranged on the cleaning plate component. A middle shell is fixedly mounted at the upper end of the lower shell, cleaning brooms used for cleaning residual ore chippings on the surface of the rolling assembly are fixedly connected to the left side and the right side of the interior of the middle shell correspondingly, and a first scraping plate and a second scraping plate in the cleaning plate assembly are arranged; and the first scraping plate and the second scraping plate are correspondingly arranged in a gap between the wave welding rods and the interior of the wave meshing groove and are used for cleaning ores clamped in the gap between the wave welding rods and the interior of the wave meshing groove.

Description

Technical Field

[0001] This utility model belongs to the field of double roll crushers, specifically relating to a stable double roll crusher with wear-resistant rolls. Background Technology

[0002] A roller crusher is a mechanical device that uses two opposing rotating rollers to crush materials. It is widely used in mining, metallurgy, building materials, chemical, coal and other industries for medium and fine crushing of ores, rocks and industrial materials with medium hardness or less.

[0003] To improve the crushing efficiency of roller crushers, one method involves setting wavy meshing bars on the rollers. However, due to the uneven surface of the rollers, crushed ore can easily get stuck between the wavy lines, affecting subsequent crushing operations. To solve this problem, scrapers or cleaning brooms are often used to clean the fragments stuck in the rollers. However, because the rollers have wavy lines, common scrapers cannot clean the ore between the wavy lines, and cleaning brooms are difficult to remove the ore stuck on the rollers. Therefore, there is an urgent need for a stable double-roll crusher with wear-resistant rollers to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of common technologies in the background, such as scrapers being unable to clean the ore between the wavy lines and brooms being difficult to remove the ore stuck on the rollers, thereby realizing a stable double-roll crusher with wear-resistant rollers.

[0005] To achieve the above-mentioned objectives, the technical solution of this utility model is: a stable double-roll crusher with wear-resistant rollers, comprising a lower shell, a roller pressing assembly rotating inside the lower shell, a cleaning plate assembly for cleaning residual ore stuck on the roller pressing assembly being provided at the bottom of the roller pressing assembly, a middle shell being fixedly installed at the upper end of the lower shell, and cleaning brooms for cleaning residual ore debris on the surface of the roller pressing assembly being fixedly connected to both the left and right sides inside the middle shell.

[0006] In the aforementioned stable double roll crusher with wear-resistant rollers, the roller pressing assembly includes a first roller rotatably connected to the lower housing and a second roller rotatably connected to the lower housing. A plurality of corrugated welding rods are fixedly connected to the side wall of the first roller, and a plurality of corrugated meshing grooves are rotatably connected to the side wall of the second roller. The plurality of corrugated welding rods respectively mesh with the corresponding corrugated meshing grooves.

[0007] In the aforementioned stable double roll crusher with wear-resistant rollers, the cleaning plate assembly includes a base plate fixedly connected to the inside of the lower housing. A guide rod is fixedly connected to the base plate, and multiple sliding parts are slidably connected to the guide rod. A baffle is fixedly connected to one side of the upper surface of each of the multiple sliding parts. A combined rod is rotatably connected to one end of each of the multiple sliding parts away from the corresponding baffle. One end of each of the multiple combined rods is provided with a thread.

[0008] In the aforementioned stable double roll crusher with wear-resistant rollers, the other ends of multiple combined rods are fixedly connected to torsion springs, the threaded ends of multiple combined rods are threaded to a second nut, the multiple second nuts are in contact with the corresponding sliding members, the threaded ends of multiple combined rods are threaded to a first nut, the multiple second nuts are in contact with the corresponding first nuts, and the lower surfaces of multiple sliding members are provided with ramps on both sides.

[0009] In the aforementioned stable double roll crusher with wear-resistant rollers, a first scraper is rotatably connected to the sliding member, and the first scraper is fixedly connected to the corresponding torsion spring. The first scraper is a wide strip shape.

[0010] In the aforementioned stable double roll crusher with wear-resistant rollers, a second scraper is rotatably connected to the sliding member, the second scraper is fixedly connected to the corresponding torsion spring, and the top end of the second scraper is cylindrical.

[0011] In the aforementioned stable double-roll crusher with wear-resistant rollers, the two cleaning brooms respectively contact the surfaces of the corresponding roller pressing assemblies.

[0012] In the aforementioned stable double roll crusher with wear-resistant rollers, the bottom of each of the sliding parts is provided with a groove, and a rolling wheel is rotatably connected inside each of the grooves, with each rolling wheel in contact with the base plate.

[0013] In the aforementioned stable double roll crusher with wear-resistant rollers, a disassembly baffle is fixedly installed on the surface of the lower housing, and a drawer slides through the inner bottom of the lower housing.

[0014] In the aforementioned stable double roll crusher with wear-resistant rollers, an upper shell is fixedly installed on the upper surface of the middle shell, and a feed hopper is installed on the upper surface of the upper shell.

[0015] Compared with the prior art, the stable double roll crusher with wear-resistant rollers of this utility model has at least the following beneficial effects:

[0016] 1. The present invention relates to a stable double-roll crusher with wear-resistant rollers. By setting the first scraper and the second scraper in the cleaning plate assembly, the first scraper and the second scraper are disposed inside the gap between the corrugated welding rods and the corrugated meshing groove to clean the ore stuck in the gap between the corrugated welding rods and the corrugated meshing groove. Furthermore, when the first scraper and the second scraper encounter ore that cannot be cleaned, the first scraper and the second scraper can be moved to stop obstructing the ore and avoid jamming, thereby improving the safety of the cleaning plate assembly.

[0017] 2. The stable double-roll crusher with wear-resistant rollers of this utility model uses an external tool to drive the octagonal groove to rotate, thereby driving the combined rod to rotate and adjust the relative angle between the combined rod and the first scraper, thereby adjusting the energy stored in the torsion spring. This avoids the phenomenon that the torsion spring cannot store enough energy due to long-term use of the cleaning plate assembly, thus failing to clean the ore in the corrugated welding rod and the corrugated meshing groove, thereby ensuring the stability of the cleaning plate assembly in cleaning ore.

[0018] 3. The stable double-roll crusher with wear-resistant rollers of this utility model, by setting the installation positions of the first scraper and the second scraper in the cleaning plate assembly at a distance from the first roller and the second roller, only allows them to clean the jammed ore. For some finer ores, the cleaning broom is used. The front end of the cleaning broom is a brush part. That is, the combined action of the first scraper, the second scraper and the cleaning broom can clean the debris and debris on the first roller and the second roller, avoiding the residual substances on the first roller and the second roller from affecting the subsequent crushing work.

[0019] 4. The stable double roll crusher with wear-resistant rollers of this utility model, by setting the rolling of the rolling wheels, enables the first scraper and the second scraper to better follow the movement of the corrugated welding rod or the corrugated meshing groove, thereby better adapting to the cleaning work of the corrugated welding rod and the corrugated meshing groove with different corrugated shapes.

[0020] 5. The present invention relates to a stable double-roll crusher with wear-resistant rollers, wherein two inclined ramps are respectively set on both sides of the corresponding sliding member. When the sliding member moves, it will drive the inclined ramps to move, thereby guiding the debris falling on the bottom plate to move away from the surface of the bottom plate. At the same time, the bottom plate is set in an inclined state to facilitate the debris falling on the bottom plate to leave the surface of the bottom plate better. Attached Figure Description

[0021] Figure 1This is a schematic diagram of the overall structure of the stable double roll crusher with wear-resistant rollers according to this utility model;

[0022] Figure 2 This is a schematic diagram of the back structure of the stable double-roll crusher with wear-resistant rollers according to this utility model;

[0023] Figure 3 This is a schematic diagram showing the position of the cleaning plate assembly of the stabilized double roll crusher with wear-resistant rollers on the lower housing according to the present invention.

[0024] Figure 4 This is a schematic diagram of the structure of the stable double-roll crusher cleaning broom with wear-resistant rollers in the position of the roller pressing assembly according to the present invention.

[0025] Figure 5 This is a schematic diagram of the overall structure of the stable double-roll crusher base plate with wear-resistant rollers according to this utility model.

[0026] Figure 6 This is a schematic diagram of the bottom structure of the sliding component of the stabilized double-roll crusher with wear-resistant rollers according to this utility model;

[0027] Figure 7 This is a schematic diagram of the structure of the stable double roll crusher with wear-resistant rollers and a second scraper installed on the bottom plate of the present invention.

[0028] Figure 8 This utility model relates to a stable double-roll crusher with wear-resistant rollers. Figure 5 Enlarged structural diagram at point A;

[0029] Figure 9 This utility model relates to a stable double-roll crusher with wear-resistant rollers. Figure 6 Enlarged structural diagram at point B;

[0030] Figure 10 This utility model relates to a stable double-roll crusher with wear-resistant rollers. Figure 7 Enlarged structural diagram at point C.

[0031] In the diagram: 1. Lower housing; 2. Removable baffle; 3. Drawer; 4. Middle housing; 5. Upper housing; 6. Feed hopper;

[0032] 7. Roller assembly; 71. First roller; 72. Corrugated welding rod; 73. Second roller; 74. Corrugated meshing groove;

[0033] 8. Cleaning plate assembly; 81. Base plate; 82. Guide rod; 83. First nut; 84. Second nut; 85. Torsion spring; 86. Combined rod; 87. Ramp; 88. Sliding component; 89. First scraper; 810. Roller; 811. Second scraper; 812. Octagonal groove; 813. Baffle; 814. Groove;

[0034] 9. Clean the broom. Detailed Implementation

[0035] The stable double roll crusher with wear-resistant rollers of this utility model will be described in more detail below with reference to the accompanying drawings and specific embodiments.

[0036] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] This embodiment discloses a stable double-roll crusher with wear-resistant rollers. By configuring the first scraper 89 and the second scraper 811 in the cleaning plate assembly 8, the first scraper 89 and the second scraper 811 are positioned inside the gaps between the corrugated welding rods 72 and the corrugated meshing grooves 74 to clean ore stuck in these gaps and grooves. Furthermore, when the first scraper 89 and the second scraper 811 encounter ore that cannot be cleared, they can be moved to stop the ore from obstructing the process and prevent jamming. This improves the safety of the cleaning plate assembly 8. (Refer to...) Figures 1-10 It mainly includes a lower housing 1, inside which a roller pressing assembly 7 rotates. At the bottom of the roller pressing assembly 7, a cleaning plate assembly 8 is provided for cleaning residual ore stuck on the roller pressing assembly 7. A middle housing 4 is fixedly installed at the upper end of the lower housing 1. Cleaning brooms 9 for cleaning residual ore debris on the surface of the roller pressing assembly 7 are fixedly connected to the left and right sides inside the middle housing 4.

[0038] The roller pressing assembly 7 includes a first roller pressing roller 71 rotatably connected to the lower housing 1 and a second roller pressing roller 73 rotatably connected to the lower housing 1. A plurality of corrugated welding rods 72 are fixedly connected to the side wall of the first roller pressing roller 71, and a plurality of corrugated meshing grooves 74 are rotatably connected to the side wall of the second roller pressing roller 73. The plurality of corrugated welding rods 72 respectively mesh with the corresponding corrugated meshing grooves 74.

[0039] The cleaning plate assembly 8 includes a base plate 81 fixedly connected to the interior of the lower housing 1. A guide rod 82 is fixedly connected to the base plate 81. Multiple sliding members 88 are slidably connected to the guide rod 82. A baffle 813 is fixedly connected to one side of the upper surface of each of the multiple sliding members 88. A combined rod 86 is rotatably connected to one end of each of the multiple sliding members 88 away from the corresponding baffle 813. One end of each of the multiple combined rods 86 is threaded. An octagonal groove 812 is formed on the end of each combined rod 86 near the thread. A torsion spring 85 is fixedly connected to the other end of each of the multiple combined rods 86. A second nut 84 is threadedly connected to the threaded end of each of the multiple combined rods 86. Each of the multiple second nuts 84 is in contact with the corresponding sliding member 88. A first nut 83 is threadedly connected to the threaded end of each of the multiple combined rods 86. Each of the multiple second nuts 84 is in contact with the corresponding first nut 83. Slopes 87 are formed on both sides of the lower surface of each of the multiple sliding members 88. The ramp 87 moves with the sliding member 88, causing the ore on the upper surface of the base plate 81 to move away from the surface of the base plate 81.

[0040] Specific Implementation Example 1, such as Figure 8 As shown;

[0041] A first scraper 89 is rotatably connected to the sliding member 88. The first scraper 89 is fixedly connected to the corresponding torsion spring 85. The first scraper 89 is a wide strip shape. The first scraper 89 is easy to get into the corresponding corrugated welding rod 72 for cleaning the ore stuck between the corresponding corrugated welding rod 72.

[0042] Specific embodiment two, such as Figure 10 As shown,

[0043] A second scraper 811 is rotatably connected to the sliding member 88. The second scraper 811 is fixedly connected to the corresponding torsion spring 85. The top of the second scraper 811 is cylindrical. The cylindrical top facilitates cleaning the wave meshing groove 74 with smaller gaps, and cleans the ore stuck inside the slope 87 out of the wave meshing groove 74.

[0044] The two cleaning brooms 9 respectively contact the surface of the corresponding roller pressing assembly 7 to clean the debris on the surface of the roller pressing assembly 7.

[0045] The bottom of each of the multiple sliding members 88 is provided with a groove 814, and a rolling wheel 810 is rotatably connected inside the multiple grooves 814. The multiple rolling wheels 810 are in contact with the base plate 81.

[0046] A disassembly baffle 2 is fixedly installed on the surface of the lower housing 1. The cleaning plate assembly 8 is maintained by opening the disassembly baffle 2. A drawer 3 slides through the inner bottom of the lower housing 1.

[0047] An upper shell 5 is fixedly installed on the upper surface of the middle shell 4, and a feed hopper 6 is installed on the upper surface of the upper shell 5.

[0048] It should be noted that:

[0049] The baffles 813 corresponding to the first scraper 89 and the second scraper 811 are arranged opposite each other, the angle between the bottom plate 81 and the nearby cleaning broom 9 is less than 90 degrees, and the cleaning broom 9 is arranged horizontally inside the roller pressing assembly 7.

[0050] like Figure 4 In the process, the first roller 71 rotates counterclockwise, and the second roller 73 rotates clockwise.

[0051] The rolling wheel 810 extends out of the groove 814 by a gap. It should be noted that this gap is smaller than the size of common ores. At the same time, the rolling wheel 810 is in contact with the base plate 81.

[0052] When it is necessary to adjust the blocking force of the first scraper 89;

[0053] First, the first nut 83 and the second nut 84 are loosened by external force. Then, the octagonal groove 812 is rotated by an external tool. The rotation of the octagonal groove 812 causes the combined rod 86 to rotate, which in turn causes the torsion spring 85 to move. The movement of the torsion spring 85 causes the first scraper 89 to rotate until it is obstructed by the baffle 813, after which the combined rod 86 continues to rotate. The rotation of the combined rod 86 causes the torsion spring 85 to store energy, thereby adjusting the first scraper 89 to rotate at the maximum force it can receive. When the first scraper 89 is subjected to the force of the ore being moved by the roller assembly 7, the first scraper 89 rotates in the direction of the stored energy of the torsion spring 85, thus avoiding the jammed ore and preventing the cleaning plate assembly 8 from jamming and ultimately causing significant damage.

[0054] When the cleaning plate assembly 8 is used for a long time to prevent ore from getting stuck, the main force providing the obstruction is the force provided by the torsion spring 85. However, with prolonged use of the cleaning plate assembly 8 to clean ore, the torsion spring 85 may become too elastic and unable to move the ore, resulting in incomplete cleaning. By setting the first nut 83 and the second nut 84, after loosening the first nut 83 and the second nut 84, the octagonal groove 812 can be rotated by an external tool, thereby rotating the combined rod 86 and adjusting the relative angle between the combined rod 86 and the first scraper 89. This adjusts the energy stored in the torsion spring 85, thus preventing the torsion spring 85 from becoming too weak to clean the ore in the corrugated welding rod 72 and the corrugated meshing groove 74 due to insufficient energy storage after prolonged use of the cleaning plate assembly 8. This ensures the stability of the cleaning plate assembly 8 in cleaning ore.

[0055] Because the first scraper 89 and the second scraper 811 are made of hard materials, when cleaning debris from the corrugated welding rod 72 and the corrugated meshing groove 74, they are easily worn down and damaged when in contact with the first roller 71 and the second roller 73. Therefore, by setting the installation position of the first scraper 89 and the second scraper 811 in the cleaning plate assembly 8 at a distance from the first roller 71 and the second roller 73, they are only allowed to clean the stuck ore. For some finer ore, the cleaning broom 9 is used. The front end of the cleaning broom 9 is a brush part. That is, the combined action of the first scraper 89, the second scraper 811 and the cleaning broom 9 can clean the debris and debris on the first roller 71 and the second roller 73, avoiding the residual substances on the first roller 71 and the second roller 73 from affecting the subsequent crushing work.

[0056] Since both the wavy welding rod 72 and the wavy meshing groove 74 are wavy, when cleaning is required, the first scraper 89 and the second scraper 811 can better follow the movement of the wavy welding rod 72 or the wavy meshing groove 74 by setting the rolling wheel 810 to move, thereby better adapting to the cleaning work of the wavy welding rod 72 and the wavy meshing groove 74 with different wavy shapes.

[0057] Because residual ore debris on the first roller 71 and the second roller 73 falls onto the base plate 81, hindering the movement of the sliding member 88, two ramps 87 are provided on both sides of the corresponding sliding member 88. When the sliding member 88 moves, it will drive the ramps 87 to move, thereby guiding the debris falling onto the base plate 81 to move away from the surface of the base plate 81. At the same time, the base plate 81 is set in an inclined state to facilitate the debris falling onto the base plate 81 to leave the surface of the base plate 81 more easily.

[0058] The working principle of this utility model of a stable double roll crusher with wear-resistant rollers is as follows:

[0059] When the first scraper 89 cleans the ore stuck between the corrugated welding rods 72;

[0060] First, the first roller 71 moves relative to the cleaning plate assembly 8, so that the first roller 71 moves relative to the first scraper 89.

[0061] When the ore between the corrugated welding electrodes 72 becomes stuck, preventing the first scraper 89 from cleaning;

[0062] Since the direction of the force released by the torsion spring 85 is opposite to the force exerted on the first scraper 89 by the ore between the corrugated welding rods 72, when the ore between the corrugated welding rods 72 is stuck and the first scraper 89 cannot clean it, the ore drives the first scraper 89 to move, and the movement of the first scraper 89 causes the ore to be displaced.

[0063] Subsequently, when the ore is no longer in contact with the first scraper 89, the first scraper 89 is rebounded by the force of the torsion spring 85 until it is blocked by the baffle 813.

[0064] When it is necessary to adjust the cleaning force of the first scraper 89;

[0065] First, the combined rod 86 is loosened by moving the first nut 83 and the second nut 84 using an external tool. Then, the external tool is inserted into the octagonal groove 812 and rotated. The rotation of the octagonal groove 812 causes the combined rod 86 to rotate, which in turn causes the torsion spring 85 to move. The movement of the torsion spring 85 causes the first scraper 89 to move until it is blocked by the corresponding baffle 813. Then, the first scraper 89 continues to rotate by an external force. The rotation of the first scraper 89 forms an angle difference with the torsion spring 85. Finally, the first nut 83 and the second nut 84 are reinstalled in their original positions.

[0066] It should be noted that, in actual implementation, the structure depicted in the accompanying drawings is not a fixed or unchanging embodiment. The components of the embodiments of this invention described and shown in these drawings can typically be arranged and designed in various different configurations. Furthermore, the accompanying drawings and abstract drawings are merely illustrative and do not represent the specific structure or actual quantity in a concrete implementation.

[0067] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The use of terms such as "a" or "an" in this specification and claims does not necessarily indicate a limitation on quantity. Terms such as "comprising" or "including" mean that the element or component preceding the word encompasses the element or component listed following the word and its equivalents, without excluding other elements or components. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0068] The exemplary embodiments of the present invention have been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the concept of the present invention, and various combinations can be made to the various technical features and structures proposed by the present invention without exceeding the protection scope of the present invention.

Claims

1. A stabilized double-roll crusher with wear-resistant rollers, characterized in that, include: The lower housing (1) has a roller pressing assembly (7) rotating inside it. The bottom of the roller pressing assembly (7) is provided with a cleaning plate assembly (8) for cleaning residual ore stuck on the roller pressing assembly (7). The upper end of the lower housing (1) is fixedly installed with a middle housing (4). The left and right sides inside the middle housing (4) are fixedly connected with cleaning brooms (9) for cleaning residual ore debris on the surface of the roller pressing assembly (7). The cleaning plate assembly (8) includes a base plate (81) fixedly connected inside the lower housing (1). A guide rod (82) is fixedly connected to the base plate (81). A plurality of sliding members (88) are slidably connected to the guide rod (82). A baffle (813) is fixedly connected to one side of the upper surface of each of the plurality of sliding members (88). A combined rod (86) is rotatably connected to one end of each of the plurality of sliding members (88) away from the corresponding baffle (813). A thread is provided at one end of each of the plurality of combined rods (86).

2. The stabilized double roll crusher with wear-resistant rollers according to claim 1, characterized in that: The roller pressing assembly (7) includes a first roller pressing wheel (71) rotatably connected to the lower housing (1) and a second roller pressing wheel (73) rotatably connected to the lower housing (1). A plurality of corrugated welding rods (72) are fixedly connected to the side wall of the first roller pressing wheel (71), and a plurality of corrugated meshing grooves (74) are rotatably connected to the side wall of the second roller pressing wheel (73). The plurality of corrugated welding rods (72) respectively mesh with the corresponding corrugated meshing grooves (74).

3. The stabilized double roll crusher with wear-resistant rollers according to claim 1, characterized in that: The other end of each of the multiple combined rods (86) is fixedly connected to a torsion spring (85). An octagonal groove (812) is provided on the end of each combined rod (86) near the thread. Each of the multiple combined rods (86) has a second nut (84) threaded to its threaded end. Each of the multiple second nuts (84) is in contact with the corresponding sliding member (88). Each of the multiple combined rods (86) has a first nut (83) threaded to its threaded end. Each of the multiple second nuts (84) is in contact with the corresponding first nut (83). Both sides of the lower surface of each of the multiple sliding members (88) are provided with ramps (87).

4. The stabilized double roll crusher with wear-resistant rollers according to claim 3, characterized in that: The first scraper (89) is rotatably connected to the sliding member (88), and the first scraper (89) is fixedly connected to the corresponding torsion spring (85). The first scraper (89) is a wide strip shape.

5. The stabilized double roll crusher with wear-resistant rollers according to claim 3, characterized in that: The sliding member (88) is rotatably connected to a second scraper (811), which is fixedly connected to the corresponding torsion spring (85). The top of the second scraper (811) is cylindrical.

6. The stabilized double roll crusher with wear-resistant rollers according to claim 1, characterized in that: The two cleaning brooms (9) respectively contact the surface of the corresponding roller assembly (7).

7. The stabilized double roll crusher with wear-resistant rollers according to claim 3, characterized in that: The bottom of each of the sliding members (88) is provided with a groove (814), and the interior of each of the grooves (814) is rotatably connected with a rolling wheel (810), and the rolling wheel (810) is in contact with the base plate (81).

8. The stabilized double roll crusher with wear-resistant rollers according to claim 1, characterized in that: A disassembly baffle (2) is fixedly installed on the surface of the lower housing (1), and a drawer (3) slides through the inner bottom of the lower housing (1).

9. The stabilized double roll crusher with wear-resistant rollers according to claim 1, characterized in that: The upper shell (5) is fixedly installed on the upper surface of the middle shell (4), and the feed hopper (6) is installed on the upper surface of the upper shell (5).

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