Weighing hopper device for clinker glass slag
By designing a weighing hopper device for clinker glass slag, the movement of the movable plate is driven by telescopic parts to control the opening and closing of the discharge port, the problem of inaccurate weighing and inaccurate measurement in the prior art is solved, and the effect of accurate weighing and timely discharge of materials is achieved.
Patent Information
- Application Number
- CN202421439471.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-21
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-06-21
AI Technical Summary
In the prior art, precise weighing cannot be carried out through belt conveying clinker glass slag, and the reduction weighing uses sensors with a large scale, which leads to the problem of inaccurate measurement when the material discharge is small.
A weighing hopper device for clinker glass slag is designed, including a mounting frame, a weighing sensor, a tank bucket, a movable plate and a fixing frame. The telescopic parts drive the movement of the movable plate, control the opening and closing of the discharge port, and realize the precise weighing and timely discharge of the clinker glass slag.
Accurate weighing of clinker glass slag is achieved, the load of the weighing sensor is reduced, the weighing accuracy is improved, and the material is discharged in a timely manner, avoiding the problem of inaccurate measurement.
Smart Images
Figure CN222561093U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of clinker glass slag weighing, and in particular to a weighing hopper device for clinker glass slag. Background Art
[0002] Clinker slag refers to a non-crystalline material formed by the remaining part due to the failure of some substances in the raw materials to be completely consumed during the glass manufacturing process. Clinker slag usually has the characteristics of high hardness, high density, and strong wear resistance. In the melting process of optical glass, it is necessary to put clinker slag of different constants into the furnace. Before that, it is necessary to accurately weigh the clinker slag of different constants. The existing feeding equipment is a belt conveyor. The belt conveyor uses a constant speed to continuously feed the pool furnace. There is no weighing device. The glass slag is weighed and fed by manual calculation of constant proportions. The labor intensity is high and the feeding amount error is large, which affects the quality of glass products. At present, other furnaces mostly use the weighing method of reduction scale. The reduction weighing method is to weigh the entire silo storing the clinker slag. It is necessary to select a weighing sensor with a larger range. When the material discharge is small, it is easy to have inaccurate measurements.
[0003] Therefore, a weighing hopper device for clinker slag is urgently needed, which can accurately weigh the clinker slag and discharge the clinker slag in time after weighing. Utility Model Content
[0004] The main purpose of the present application is to provide a weighing hopper device for clinker slag, aiming to solve the problem that the prior art cannot weigh the clinker slag when conveying it by belt, and that a weighing sensor with a larger range is required when weighing by reduction-by-reduction method. When the material discharge volume is small, inaccurate measurement is prone to occur.
[0005] To achieve the above-mentioned purpose, the present application provides a weighing hopper device for clinker slag, comprising: a mounting frame on which a weighing sensor is arranged; a bin, which is interconnected with the weighing sensor, and the bin has a discharge port; a movable plate, which is connected with the bin, and the movable plate is configured to cooperate with the discharge port to adjust the opening size of the discharge port; a fixed frame, which is interconnected with the bin, and at least one driving unit is arranged on the fixed frame, and the driving unit includes a driving member, one end of the driving member is hinged to the fixed frame, and the other is a free end, and the free end of the driving member is hinged to the movable plate; a telescopic member is arranged on the mounting frame, and the telescopic member is configured to drive the driving member to adjust the position of the movable plate.
[0006] Optionally, the telescopic member is connected to a mounting seat, the mounting seat is interconnected with the mounting frame, the driving members of each driving unit are interconnected through a lifting rod, the telescopic member is located below the lifting rod, and the telescopic member can abut against the lifting rod and drive the lifting rod to move up and down.
[0007] Optionally, the telescopic end of the telescopic member is connected to a warehouse opening pull plate, and a buckle corresponding to the driving unit is provided on the warehouse opening pull plate, and the buckle has a slot, and the slot has relative upper side walls and lower side walls, and the upper side wall and the lower side wall can be selectively abutted against the lifting rod to drive the lifting rod to move up and down.
[0008] Optionally, the distance between the upper side wall and the lower side wall is greater than the outer diameter of the lifting rod.
[0009] Optionally, the telescopic member is one of an oil cylinder, a pneumatic cylinder or an electric push rod.
[0010] Optionally, a limit block is provided on the fixing frame and is located below the hinge between the driving member and the fixing frame. The limit block can form a limit structure with the driving member to limit the maximum angle of downward rotation of the driving member around the hinge between the driving member and the fixing frame.
[0011] Optionally, a module bracket is provided on the mounting frame, the weighing sensor is provided on the module bracket, a silo bracket is provided on the weighing sensor, and the silo bucket and the silo bracket are connected to each other.
[0012] Optionally, the silo support includes a crossbeam and side guard plates arranged at both ends of the crossbeam, the crossbeam is interconnected with the silo bucket, the fixing frame has two fixing arms respectively located on both sides of the silo bucket, and the fixing arms are interconnected with the side guard plates.
[0013] Optionally, the bin comprises a first side wall and a second side wall arranged opposite to each other, the first side wall and the second side wall are interconnected by a third side wall, the bottoms of the first side wall, the second side wall and the third side wall are interconnected by a bottom wall, the gap formed between the first side wall, the second side wall and the bottom wall is constructed as the discharge port, the upper end of the movable plate is hinged to the first side wall and the second side wall respectively, the lower end of the movable plate is free, and the movable plate can overlap with the first side wall, the second side wall and the bottom wall to block the discharge port.
[0014] Optionally, the bottom wall of the hopper gradually slopes downward in a direction approaching the discharge port.
[0015] Beneficial effects that this application can achieve:
[0016] The embodiment of the present application proposes a weighing hopper device for clinker slag, in which a bucket and a movable plate cooperate to form an accommodating space for accommodating the clinker slag, and the bucket is completely suspended by a weighing sensor. A fixed frame is arranged on the bucket, and a driving unit for driving the movable plate to move is arranged on the fixed frame to control the opening and closing of a discharge port on the bucket, so that the clinker slag can be discharged from the discharge port in time after the weighing of the clinker slag is completed; a telescopic member for controlling the movement of the movable plate is arranged on a mounting frame, and the bucket does not need to bear the weight of the telescopic member, thereby reducing the load of the weighing sensor, and a relatively suitable sensor can be selected according to the weight of the material to be weighed to improve the weighing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic structural diagram of a weighing hopper device from a first perspective according to an embodiment of the present application;
[0018] Figure 2 A schematic diagram of the structure of the weighing hopper device according to an embodiment of the present application from a second perspective;
[0019] Figure 3 This is a schematic structural diagram of the weighing hopper device from a third perspective according to an embodiment of the present application;
[0020] Figure 4 for Figure 3 A partial schematic diagram of the middle fixed frame and the bin;
[0021] Figure 5 for Figure 4 Another perspective structural diagram of the middle fixing frame;
[0022] Figure 6 It is a partial schematic diagram of the bin and the movable plate.
[0023] In the figure: 10-mounting frame, 20-weighing sensor, 21-module bracket, 22-silo bracket, 221-crossbeam, 222-side guard plate, 30-bin, 31-first side wall, 32-second side wall, 33-third side wall, 34-bottom wall, 40-movable plate, 50-fixed frame, 51-fixed arm, 52-limiting block, 60-driving unit, 61-driving member, 62-connecting member, 70-lifting rod, 80-telescopic member, 81-mounting seat, 82-opening pull plate, 821-buckle, 822-slot.
[0024] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0026] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0027] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.
[0029] Example 1
[0030] Reference Figure 1-Figure 6The first embodiment of the present application provides a weighing hopper device for clinker glass slag, comprising a mounting frame 10, a bin 30, a movable plate 40, a fixed frame 50 and a telescopic member 80. A weighing sensor 20 is arranged on the mounting frame 10; the bin 30 is connected to the weighing sensor 20, and the bin 30 has a discharge port; the movable plate 40 is connected to the bin 30, and the movable plate 40 is configured to cooperate with the discharge port to adjust the opening size of the discharge port; the fixed frame 50 is connected to the bin 30, and at least one driving unit 60 is arranged on the fixed frame 50, and the driving unit 60 includes a driving member 61, one end of the driving member 61 is hinged to the fixed frame 50, and the other end is a free end, and the free end of the driving member 61 is hinged to the movable plate 40 through a connecting member 62; the telescopic member 80 is arranged on the mounting frame 10, and the telescopic member 80 is configured to drive the driving member 61 to adjust the position of the movable plate 40.
[0031] In this embodiment, the mounting frame 10 is the mounting frame of the weighing hopper device, which is welded from square tubes to ensure sufficient rigidity and strength. The mounting frame 10 includes a square frame formed by connecting four square tubes end to end in sequence. The hopper 30 and the movable plate 40 and other structures are located in the middle space enclosed by the square frame. The lower end of the square frame is provided with at least three legs. As a preferred mode, the lower end of the leg can be equipped with a universal wheel, and at least one universal wheel has a locking structure. The weighing sensor 20 is arranged on the mounting frame 10, and the hopper 30 is arranged on the weighing sensor 20. The weighing sensor 20 provides support for the hopper 30. The hopper 30 is in a suspended state relative to the mounting frame 10, and the weighing is not affected by external connections. The hopper 30 is used to accommodate the clinker slag. The hopper 30 is provided with a discharge port. When the clinker slag is weighed, the clinker slag is discharged in time through the discharge port.
[0032] The upper end of the movable plate 40 is hinged to the bin 30, and the lower end of the movable plate 40 is a free end. The free end of the movable plate 40 rotates around the hinge. When the movable plate 40 rotates to fit the bin 30, the movable plate 40 can block the discharge port. At this time, the movable plate 40 cooperates with the bin 30 to form a storage space for accommodating clinker glass slag. After weighing, the movable plate 40 rotates in the opposite direction to open the discharge port, so that the clinker glass slag in the storage space can be discharged through the discharge port. By setting the telescopic member 80 and the drive unit 60, the telescopic member 80 is set on the mounting frame 10, and the weighing sensor 20 does not need to bear the weight of the telescopic member 80. When the clinker glass in the bin 30 is weighed, the telescopic member 80 is in a separated state from the lifting rod 70; when the clinker glass needs to be discharged, the telescopic member 80 telescopically moves to contact the lifting rod 70 to drive the lifting rod 70 to move upward.
[0033] One end of the driving member 61 is rotatably connected to the fixing frame 50 through the first rotating shaft, and the other end of the driving member 61 is a free end; one end of the connecting member 62 is connected to the free end of the movable plate 40 through the second rotating shaft, and the other end of the connecting member 62 is a free end; the free end of the driving member 61 and the free end of the connecting member 62 are hinged through the third rotating shaft, and the lifting rod 70 is connected to one end of the driving member 61 close to the third rotating shaft, and the axis of the lifting rod 70 is parallel to the axis of the first rotating shaft. When the lifting rod 70 moves upward (the lifting rod 70 does not move vertically, but rotates around the axis of the first rotating shaft), the third rotating shaft rotates upward around the axis of the first rotating shaft, that is, the free end of the movable plate 40 is driven to move away from the bin 30, and the discharge port is opened to discharge the clinker slag. The bin 30, the movable plate 40, the fixing frame 50, the driving unit 60, the lifting rod 70, and the clinker slag contained in the bin 30 are carried on the weighing sensor 20 as a whole. The weighing sensor 20 obtains the weight of the clinker slag before and after entering, and the difference between the two is the net weight of the clinker slag. The PLC programmable controller can be used to control the movement of the telescopic part 80 to complete the entire power. The main process is as follows: After the device is powered on and ventilated, the cylinder is pulled down to the specified position, the lifting rod 70 moves down to the specified position, the drive unit 60 locks the movable plate 40, and the material enters the bin 30. After reaching the preset weight, the weighing stops and waits for the discharge signal. The cylinder pushes up, and the drive part 61 that locks the movable plate 40 flips upward, driving the movable plate 40 to open the discharge port for discharge.
[0034] Example 2
[0035] As an optional implementation, refer to Figure 2 and Figure 4 The present embodiment provides a specific installation structure of a telescopic member 80, including: the telescopic member 80 is connected to a mounting seat 81, the mounting seat 81 is interconnected with the mounting frame 10, the driving members 61 of each driving unit 60 are interconnected through a lifting rod 70, the telescopic member 80 is located below the lifting rod 70, and the telescopic member 80 can abut against the lifting rod 70 and drive the lifting rod 70 to move up and down.
[0036] In this embodiment, the telescopic member 80 is fixed by the mounting seat 81, and the telescopic member 80 is fixed on the mounting frame 10. The telescopic member 80 is located below the lifting rod 70, so that the telescopic member 80 can abut against the lifting rod 70 when it is telescopically moved, and drive the lifting rod 70 to move up and down. The weighing sensor 20 can be selected according to the weight range and accuracy. Toledo brand platform scale, model MT1241, range 50KG, sensitivity 2.0±0.2mv / V.
[0037] Example 3
[0038] As an optional implementation, refer to Figure 4 and Figure 5 The present embodiment provides a specific structure for a telescopic member 80 to drive the lifting rod 70 to move, including: the telescopic end of the telescopic member 80 is connected to a warehouse opening pull plate 82, and a buckle 821 corresponding to the driving unit 60 is provided on the warehouse opening pull plate 82, and the buckle 821 has a slot 822, and the slot 822 has opposite upper side walls and lower side walls, and the upper side walls and the lower side walls can be selectively abutted against the lifting rod 70 to drive the lifting rod 70 to move up and down.
[0039] Optionally, the distance between the upper side wall and the lower side wall is greater than the outer diameter of the lifting rod 70 .
[0040] Optionally, the telescopic member 80 is an oil cylinder, a pneumatic cylinder or an electric push rod.
[0041] In this embodiment, the opening plate 82 is connected to the telescopic end of the telescopic member 80. The slot 822 provided on the opening plate 82 is used to cooperate with the lifting rod 70. The slot 822 is an open structure at one end, which is convenient for the lifting rod 70 to enter the slot 822. The upper side wall of the slot 822 is located at the upper end of the slot 822, and the lower side wall of the slot 822 is located at the lower end of the slot 822. When the clinker glass in the bin 30 needs to be discharged after weighing, the telescopic end of the telescopic member 80 drives the opening plate 82 to move upward, and the lower end of the slot 822 contacts the lower end of the lifting rod 70, driving the lifting rod 70 to move upward, and further driving the movable plate 40 to rotate around its upper end hinge through the driving assembly, opening the discharge port of the bin 30 for discharge. When the material is discharged and the next batch of clinker glass needs to be weighed, the telescopic end of the telescopic member 80 drives the warehouse opening pull plate 82 to move downward, and the upper side wall of the slot 822 abuts against the upper end of the lifting rod 70, driving the lifting rod 70 to move downward, and the free end of the movable plate 40 is pushed toward the direction close to the bin 30 by the driving assembly to close the discharge port. The movable plate 40 is pressed against by the connecting member 62 and the driving member 61. When the clinker glass in the bin 30 is weighed, the buckle 821 and the lifting rod 70 are in a separated state, that is, the telescopic member 80 does not apply external force to the fixing frame 50, thereby improving the accuracy of the weight data obtained by the weighing sensor 20. By limiting the distance between the upper side wall and the lower side wall to be greater than the outer diameter of the lifting rod 70, the lifting rod 70 can be located in the gap between the upper side wall and the lower side wall, so that the lifting rod 70 and the telescopic member 80 are in a separated state.
[0042] Example 4
[0043] As an optional implementation, refer to Figure 4 and Figure 5This embodiment provides a limiting structure for a driving member 61, including: a limiting block 52 is provided on the fixed frame 50 and is located below the hinge between the driving member 61 and the fixed frame 50. The limiting block 52 can form a limiting structure with the driving member 61 to limit the maximum angle of downward rotation of the driving member 61 around the hinge between the driving member 61 and the fixed frame 50.
[0044] In this embodiment, the limit member is arranged on the fixed frame 50, and the limit member will not affect the normal upward (clockwise) rotation of the driving member 61. However, when the limit member rotates downward (counterclockwise), the driving member 61 interferes with the limit member, and the limit member prevents the driving member 61 from continuing to rotate downward. When the movable plate 40 is supported by the driving member 61 and the connecting member 62, the driving member 61 is restricted from rotating downward by the limit member, thereby improving the structural stability.
[0045] Example 5
[0046] As an optional implementation, refer to Figure 1-Figure 3 This embodiment provides a specific installation structure of a bin 30, including: a module bracket 21 is arranged on the installation frame 10, a weighing sensor 20 is arranged on the module bracket 21, a silo bracket 22 is arranged on the weighing sensor 20, and the bin 30 and the silo bracket 22 are connected to each other.
[0047] Optionally, the silo support 22 includes a crossbeam 221 and side guard plates 222 arranged at both ends of the crossbeam 221, the crossbeam 221 is interconnected with the hopper 30, and the fixing frame 50 has two fixing arms 51 respectively located on both sides of the hopper 30, and the fixing arms 51 are interconnected with the side guard plates 222.
[0048] In this embodiment, the weighing sensor 20 is supported by the module bracket 21, and the hopper 30 is connected to the weighing sensor 20 by providing a silo bracket 22. The silo bracket 22 includes a crossbeam 221 and two side guard plates 222. The crossbeam 221 is connected to the hopper 30 by a bolt assembly, and the side guard plates 222 are connected to the fixed arms 51 of the fixing frame 50, so as to reduce the need to open holes in the hopper 30. The fixing frame 50 is connected to the two side guard plates 222 by the two fixed arms 51, so as to improve the structural stability.
[0049] Example 6
[0050] As an optional implementation, refer to Figure 1 , Figure 3 , Figure 4 and Figure 6 , Figure 6In order to open the discharge port of the bin 30, the present embodiment provides a specific structure of the bin 30, including: the bin 30 includes a first side wall 31 and a second side wall 32 arranged opposite to each other, the first side wall 31 and the second side wall 32 are interconnected by a third side wall 33, the bottoms of the first side wall 31, the second side wall 32 and the third side wall 33 are interconnected by a bottom wall 34, the gap formed between the first side wall 31, the second side wall 32 and the bottom wall 34 is constructed as the discharge port, the upper ends of the movable plate 40 are hinged to the first side wall 31 and the second side wall 32 respectively, and the movable plate 40 can overlap with the first side wall 31, the second side wall 32 and the bottom wall 34 to block the discharge port.
[0051] Optionally, the bottom wall 34 of the hopper 30 gradually slopes downward in a direction close to the discharge port.
[0052] In this embodiment, the two sides of the movable plate 40 are bent inward to form side wings, and the two side wings are respectively hinged with the first side wall 31 and the second side wall 32 through the pin shaft. When the movable plate 40 is overlapped on the bin 30, the movable plate 40 contacts the ends of the first side wall 31, the second side wall 32 and the bottom wall 34. The first side wall 31, the second side wall 32, the third side wall 33, the bottom wall 34 and the movable plate 40 are enclosed together to form a space for accommodating clinker glass slag. By tilting the bottom wall 34, the clinker glass slag on the bottom wall 34 can automatically slide down on the inclined surface of the bottom wall 34. When the movable plate 40 is turned outward, the clinker glass in the bin 30 can be automatically discharged.
[0053] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.
Claims
1. A weighing hopper device for clinker slag, characterized in that: include: An installation frame is provided with a weighing sensor; A bin, which is connected to the weighing sensor, and the bin has a discharge port; A movable plate connected to the hopper, the movable plate being configured to cooperate with the discharge port to adjust the opening size of the discharge port; A fixed frame, which is connected to the bucket, and at least one driving unit is arranged on the fixed frame, and the driving unit includes a driving member, one end of the driving member is hinged to the fixed frame, and the other end is a free end, and the free end of the driving member is hinged to the movable plate; A telescopic member is arranged on the mounting frame, and the telescopic member is configured to drive the driving member to adjust the position of the movable plate.
2. The weighing hopper device for clinker slag according to claim 1, characterized in that: The telescopic member is connected to a mounting seat, the mounting seat is interconnected with the mounting frame, the driving members of each driving unit are interconnected through a lifting rod, the telescopic member is located below the lifting rod, and the telescopic member can abut against the lifting rod and drive the lifting rod to move up and down.
3. The weighing hopper device for clinker slag according to claim 2, characterized in that: The telescopic end of the telescopic member is connected with an opening pull plate, and the opening pull plate is provided with a buckle corresponding to the driving unit, and the buckle has a slot, and the slot has relative upper side walls and lower side walls, and the upper side wall and the lower side wall can be selectively abutted with the lifting rod to drive the lifting rod to move up and down.
4. The weighing hopper device for clinker slag according to claim 3, characterized in that: The distance between the upper side wall and the lower side wall is greater than the outer diameter of the lifting rod.
5. The weighing hopper device for clinker slag according to any one of claims 1 to 4, characterized in that: The telescopic member is one of an oil cylinder, an air cylinder or an electric push rod.
6. The weighing hopper device for clinker slag according to claim 1, characterized in that: The fixing frame is provided with a limit block located below the hinge between the driving member and the fixing frame, and the limit block can form a limit structure with the driving member to limit the maximum angle of the driving member rotating downward around the hinge between the driving member and the fixing frame.
7. The weighing hopper device for clinker slag according to claim 1, characterized in that: A module bracket is arranged on the mounting frame, the weighing sensor is arranged on the module bracket, a silo bracket is arranged on the weighing sensor, and the silo bucket is connected to the silo bracket.
8. The weighing hopper device for clinker slag according to claim 7, characterized in that: The silo support includes a crossbeam and side guard plates arranged at both ends of the crossbeam, the crossbeam is connected to the silo bucket, the fixing frame has two fixing arms respectively located on both sides of the silo bucket, and the fixing arms are connected to the side guard plates.
9. The weighing hopper device for clinker slag according to claim 1, characterized in that: The bin comprises a first side wall and a second side wall which are arranged opposite to each other, the first side wall and the second side wall are connected to each other via a third side wall, the bottoms of the first side wall, the second side wall and the third side wall are connected to each other via a bottom wall, the gap formed between the first side wall, the second side wall and the bottom wall is constructed as the discharge port, the upper end of the movable plate is hinged to the first side wall and the second side wall respectively, the lower end of the movable plate is free, and the movable plate can overlap with the first side wall, the second side wall and the bottom wall to block the discharge port.
10. The weighing hopper device for clinker slag according to claim 9, characterized in that: The bottom wall of the hopper gradually slopes downward in a direction close to the discharge port.