Pet feed modulator

Abstract

The utility model provides a pet feed preparing device which comprises a preparing tank, a discharging assembly is arranged at the bottom of the preparing tank, a stirring assembly is arranged in the preparing tank, and a low-speed motor drives a transmission main shaft rod to rotate at a low speed. The transmission main shaft rod drives a plurality of lower stirring bars to rotate together through a follow-up rod so as to stir, mix and modulate feed raw materials and feed additives in the lower part of the interior of the modulation tank; the transmission main shaft rod can also drive a plurality of upper stirring rods to rotate through a first driving belt wheel, a second driving belt wheel, a first transmission belt, a second driving belt wheel, a first driven rod and a second driven rod so as to stir, mix and modulate feed raw materials and feed additives at the upper part in the modulation tank; an electric push rod is controlled to drive a material blocking plate to move upwards to be opened through a connecting plate, then an electric hydraulic push rod drives a modulation tank to swing clockwise through a first hinged support, and thus the modulated mixed feed can be discharged rapidly.

Description

Technical Field

[0001] The utility model relates to the technical field of pet feed preparation, in particular to a pet feed preparation device. Background Art

[0002] Pet feed refers to feed prepared with a variety of feed raw materials and feed additives in a certain proportion to meet the nutritional needs of pets at different life stages or under specific physiological and pathological conditions. It can meet the comprehensive nutritional needs of pets when used alone. In the process of processing pet feed, a corresponding modulator is needed. The modulator is a kind of equipment in the pet feed processing production line, which is mainly used to mix and modulate pet feed. It can mix feeds of different ingredients according to the needs of different pets and in a certain ratio, ensuring the balance and full utilization of various nutrients in the feed, so that pets can obtain comprehensive and balanced nutrition, thereby improving the production performance and health level of pets.

[0003] Publication number "CN214345952U" provides a feed modulator. Due to the setting of the feed baffle on the stirring shaft, the feed is blocked on the feed baffle. At this time, the motor can be started to rotate and drive the feed baffle to rotate. When the feed groove on the feed baffle coincides with the through groove, the feed raw materials in the feed pipe can freely fall into the processing box. The stirring blades arranged on the outer wall of the stirring shaft and the stirring blades arranged on the frame stir the fallen feed. Due to the special setting of the feed groove, the feed raw materials in the first raw material box and the second raw material box are circulated into the processing box in turn for stirring, mixing and filling.

[0004] However, the above technical solutions and the prior art have the following defects:

[0005] When discharging the feed, the staff of the feed modulator needs to unplug the pin in the socket before the partition can be swung open for unloading. However, in actual use of this discharging method, the feed in the processing box will exert downward pressure on the partition, so that the partition exerts downward pressure on the pin in the socket through the base. At this time, the pin in the socket will be difficult to unplug, so the discharging convenience is low. Secondly, the stirring pieces and stirring blades in the feed modulator cannot stir the feed on the upper side of the processing box, but can only stir the feed in the middle area and bottom of the processing box. The stirring range needs to be improved. Utility Model Content

[0006] The purpose of the utility model is to provide a pet food mixer to solve the problems raised in the above background technology.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A pet feed mixer comprises a mixing tank, a protective cover, a support base plate, a feeding hopper and a tank cover, wherein the upper end surface of the mixing tank is installed with the tank cover, the upper end surface of the tank cover is installed with the protective cover, the supporting base plate is installed below the mixing tank, the feeding hopper is arranged on the left side of the annular side surface of the mixing tank, a discharge assembly is arranged at the bottom of the mixing tank, and the discharge assembly is used to quickly discharge the pet feed prepared in the mixing tank, and a stirring assembly is arranged inside the mixing tank, and the stirring assembly is used to stir and mix a variety of feed raw materials and feed additives poured into the mixing tank.

[0009] Preferably, the stirring assembly includes a follower rod, a lower stirring rod, a low-speed motor and a transmission main shaft rod. A low-speed motor is installed in the middle position of the bottom of the modulation tank. The upper end of the low-speed motor is connected to the transmission main shaft rod. A follower rod is arranged on the lower side of the annular side of the transmission main shaft rod. The lower stirring rods are symmetrically arranged on the upper and lower sides of the annular side of the follower rod.

[0010] Preferably, a first driving pulley is arranged on the upper side of the annular side surface of the transmission main shaft rod, a first driven pulley is arranged on the left side of the first driving pulley, a first driven rod is arranged at the lower end of the first driven pulley, a second driving pulley is arranged on the upper end surface of the transmission main shaft rod, a second driven pulley is arranged on the right side of the second driving pulley, a second driven rod is arranged at the lower end of the second driven pulley, and a plurality of upper stirring rods are arranged on the lower side of the annular side surface of the second driven rod and the first driven rod.

[0011] Preferably, the unloading assembly includes an electric hydraulic push rod, a support column, a discharge hopper, a connecting plate, a material baffle plate, an electric push rod and a support plate. A discharge hopper is provided on the lower side of the right end surface of the modulation tank, a material baffle plate is installed on the right side inside the modulation tank, a connecting plate is provided on the lower side of the right end surface of the material baffle plate, an electric push rod is installed on the upper surface of the connecting plate, a support plate is fixedly connected to the right side of the annular side surface of the modulation tank, an electric hydraulic push rod is installed on the left side of the lower end surface of the modulation tank, and support columns are symmetrically fixedly connected to the upper and rear sides of the upper end surface of the support base plate.

[0012] Preferably, the upper end of the electric hydraulic push rod is movably connected to a first hinge support, the bottom of the electric hydraulic push rod is movably connected to a second hinge support, and the upper end of the support column is movably connected to a third hinge support.

[0013] Preferably, an extension block is provided on the lower side of the left end surface of the modulation tank, a limiting vertical rod is fixedly connected to the left side of the upper end surface of the support base plate, and a storage cavity is opened on the right side inside the modulation tank.

[0014] Preferably, a first transmission belt is arranged between the first driving pulley and the first driven pulley, a second transmission belt is arranged between the second driving pulley and the second driven pulley, a first limiting plate is arranged on the upper side of the annular side of the first driven rod, and a second limiting plate is arranged on the upper side of the annular side of the second driven rod.

[0015] Preferably, annular retaining covers are symmetrically installed on the left and right sides of the upper end surface of the tank cover, a blocking cover is clamped on the upper end surface of the feeding hopper, and an observation window is arranged on the upper side of the front end surface of the modulation tank.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. The low-speed motor drives the transmission main shaft to rotate at a low speed, so that the transmission main shaft drives the multiple lower stirring rods to rotate together through the follower rod to stir, mix and modulate the feed raw materials and feed additives in the lower part of the modulation tank. At the same time, the transmission main shaft also drives the first driving pulley and the second driving pulley to rotate together, so that the first driving pulley drives the first driven rod to rotate through the first driving belt and the first driven pulley, and the second driving pulley drives the second driven rod to rotate through the second driving belt and the second driven pulley, and then the first driven rod and the second driven rod drive the multiple upper stirring rods to rotate to stir, mix and modulate the feed raw materials and feed additives in the upper part of the modulation tank, so that the multiple feed raw materials and feed additives in the modulation tank are fully stirred and modulated, and the stirring range and effect are good;

[0018] 2. When it is necessary to discharge the mixed feed inside the modulation tank, first control the electric push rod to drive the baffle plate to move upward and open through the connecting plate, and then make the electric hydraulic push rod drive the modulation tank to swing clockwise through the first hinge support, so that the tilted modulation tank can quickly discharge the mixed feed after modulation inside, and the discharge efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the main structure of the utility model;

[0020] Figure 2 It is a front cross-sectional view of the stirring assembly and the discharging assembly in the utility model;

[0021] Figure 3 This is a structural diagram of the stirring assembly in the utility model;

[0022] Figure 4 This is a front cross-sectional view of the unloading assembly of the utility model in the state of unloading the modulation tank;

[0023] Figure 5 for Figure 2 A partial enlarged view of .

[0024] In the figure: 1, modulation tank; 2, protective cover; 3, stirring assembly; 31, upper stirring rod; 32, second driven rod; 321, second limiting plate; 33, second driven pulley; 34, second transmission belt; 35, second driving pulley; 36, first driving pulley; 37, first driven pulley; 38, first driven rod; 381, first limiting plate; 39, follower rod; 311, lower stirring rod; 312, low-speed motor; 313, transmission main shaft rod; 314. First transmission belt; 4. Discharging assembly; 41. Extension block; 42. Limiting vertical rod; 43. Electric hydraulic push rod; 431. First hinge support; 432. Second hinge support; 44. Support column; 441. Third hinge support; 45. Discharge hopper; 46. Connecting plate; 47. Baffle plate; 48. Electric push rod; 49. Support plate; 411. Storage chamber; 5. Support base plate; 6. Feed hopper; 61. Sealing cover; 7. Tank cover; 71. Annular baffle cover. 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 in 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] See also Figure 1-5 , the utility model provides a technical solution:

[0027] Embodiment 1:

[0028] A pet feed mixer comprises a mixing tank 1, a protective cover 2, a support base plate 5, a feeding hopper 6 and a tank cover 7. The upper end surface of the mixing tank 1 is provided with the tank cover 7, which can not only support the protective cover 2 but also seal the upper end of the mixing tank 1. The upper end surface of the tank cover 7 is provided with the protective cover 2, which can protect the first driving pulley 36, the second driving pulley 35, the first driven pulley 37 and the second driven pulley 33. A support base plate 5 is provided below the mixing tank 1, which can support the unloading assembly 4. The left and right sides and the front and rear sides of the support base plate 5 are provided with a support base plate 5. The mounting holes are symmetrically provided, and the mounting holes are convenient for external expansion bolts to install and fix the supporting base plate 5. A feeding hopper 6 is arranged on the left side of the annular side of the modulation tank 1, and the feeding hopper 6 is connected with the modulation tank 1. The feeding hopper 6 is convenient for the staff to put a variety of configured feed raw materials and feed additives into the modulation tank 1. A sealing cover 61 is mounted on the upper end face of the feeding hopper 6, and the sealing cover 61 can seal the upper end of the feeding hopper 6 to prevent external dust from entering the modulation tank 1 through the feeding hopper 6. An observation window is arranged on the upper side of the front end face of the modulation tank 1, and the observation window is convenient for the staff to observe the internal situation of the modulation tank 1 in real time.

[0029] A discharge assembly 4 is provided at the bottom of the mixing tank 1, and the discharge assembly 4 is used to quickly discharge the pet food prepared in the mixing tank 1. A stirring assembly 3 is provided inside the mixing tank 1, and the stirring assembly 3 is used to stir and mix the various feed raw materials and feed additives poured into the mixing tank 1.

[0030] The stirring assembly 3 includes a follower rod 39, a lower stirring rod 311, a low-speed motor 312 and a transmission main shaft rod 313. The low-speed motor 312 is installed in the middle position of the bottom of the modulation tank 1. The low-speed motor 312 is connected to the external control panel through a wire. The low-speed motor 312 can drive the transmission main shaft rod 313 to rotate at a low speed when working. The upper end of the low-speed motor 312 is connected to the transmission main shaft rod 313. The transmission main shaft rod 313 is connected to the follower rod 39, the first driving pulley 36 and the second driving pulley 35 by welding. The transmission main shaft rod 313 can drive the follower rod 39, the first driving pulley 36 and the second driving pulley 35 to rotate. A mechanical seal is arranged on the lower side of the annular side of the transmission main shaft rod 313. The mechanical seal makes the sealing between the transmission main shaft rod 313 and the modulation tank 1 better. The lower side of the annular side of the transmission main shaft rod 313 is provided with a follower rod 39. The movable rod 39 and the follower rod 39 are connected with the lower stirring rod 311 by welding. The follower rod 39 can drive the lower stirring rod 311 to rotate. The lower stirring rods 311 are symmetrically arranged on the upper and lower sides of the annular side surface of the follower rod 39. There are multiple lower stirring rods 311, and the multiple lower stirring rods 311 have the same specifications. The multiple lower stirring rods 311 can stir and modulate the feed raw materials and feed additives in the lower part of the modulation tank 1. The first driving pulley 36 is arranged on the upper side of the annular side surface of the transmission main shaft rod 313, and the first driven pulley 37 is arranged on the left side of the first driving pulley 36. The first driving belt 314 is arranged between the first driving pulley 36 and the first driven pulley 37. The first driving pulley 36 can drive the first driven pulley 37 to rotate through the first transmission belt 314, so that the first driven pulley 37 drives the first driven rod 38 to rotate.

[0031] A first driven rod 38 is provided at the lower end of the first driven pulley 37, and the first driven rod 38 is connected to the first limiting plate 381 and the upper stirring rod 31 on the left side by welding. The first driven rod 38 can drive the upper stirring rod 31 on the left side to rotate, and a second driving pulley 35 is provided on the upper end surface of the transmission main shaft rod 313, and a second driven pulley 33 is provided on the right side of the second driving pulley 35. A second transmission belt 34 is provided between the second driving pulley 35 and the second driven pulley 33, and the second driving pulley 35 can drive the second driven pulley 33 to rotate through the second transmission belt 34, so that the second driven pulley 33 drives the second driven rod 32 to rotate, and a second driven rod 32 is provided at the lower end of the second driven pulley 33, and the second driven rod 32 is connected to the second limiting plate 321 and The upper stirring rods 31 on the right side are connected by welding, and the second driven rod 32 can drive the upper stirring rod 31 on the right side to rotate. The second driven rod 32 and the lower side of the annular side of the first driven rod 38 are provided with multiple upper stirring rods 31. The multiple upper stirring rods 31 can stir and modulate the feed raw materials and feed additives in the upper part of the modulation tank 1. The first driven rod 38 is provided with a first limiting plate 381 on the upper side of the annular side, and the second driven rod 32 is provided with a second limiting plate 321 on the upper side of the annular side. Annular blocking covers 71 are symmetrically installed on the left and right sides of the upper end surface of the tank cover 7. The first limiting plate 381, the second limiting plate 321 and the annular blocking cover 71 prevent the first driven rod 38 and the second driven rod 32 from being displaced up and down or shaking during rotation and use.

[0032] Embodiment 2:

[0033] On the basis of Example 1, in this embodiment, the electric push rod 48 is controlled to drive the baffle plate 47 to move upward and open through the connecting plate 46, and then the electric hydraulic push rod 43 drives the modulation tank 1 to swing clockwise through the first hinge support 431, so that the tilted modulation tank 1 can quickly discharge the mixed feed after modulation inside.

[0034] The unloading assembly 4 includes an electric hydraulic push rod 43, a support column 44, a discharge hopper 45, a connecting plate 46, a baffle plate 47, an electric push rod 48 and a support plate 49. A discharge hopper 45 is arranged on the lower side of the right end face of the modulation tank 1. The discharge hopper 45 is concave in shape. The discharge hopper 45 is connected to the modulation tank 1 by welding. The concave discharge hopper 45 can centrally guide the feed discharged from the modulation tank 1. A baffle plate 47 is installed on the right side of the modulation tank 1. The baffle plate 47 is in an arc shape. The baffle plate 47 in an arc shape can block and seal the discharge end of the modulation tank 1. A sealing strip is arranged at the edge of the baffle plate 47. The sealing strip makes the sealing between the baffle plate 47 and the modulation tank 1 better. The right end face of the baffle plate 47 A connecting plate 46 is provided on the lower side, and the connecting plate 46 is connected to the baffle plate 47 by welding. The connecting plate 46 facilitates the electric push rod 48 to drive the baffle plate 47 to move up and down. An electric push rod 48 is installed on the upper end surface of the connecting plate 46, and the electric push rod 48 is connected to the external control panel through a wire. When working, the electric push rod 48 can drive the baffle plate 47 to move up and down through the connecting plate 46. A support plate 49 is fixedly connected to the right side of the annular side surface of the modulation tank 1, and the support plate 49 can support and fix the electric push rod 48. An electric hydraulic push rod 43 is installed on the left side of the lower end surface of the modulation tank 1. The electric hydraulic push rod 43 is connected to the external control panel through a wire, and the electric hydraulic push rod 43 can drive the modulation tank 1 to swing left and right when working.

[0035] The upper end face of the support base plate 5 is symmetrically fixedly connected with support columns 44 on both sides, and the support columns 44 are connected to the support base plate 5 by welding. The support columns 44 can support the right side of the lower end face of the modulation tank 1 through the third hinge support 441. The upper end of the electric hydraulic push rod 43 is movably connected with the first hinge support 431. The first hinge support 431 facilitates the movable connection between the upper end of the electric hydraulic push rod 43 and the modulation tank 1. The bottom of the electric hydraulic push rod 43 is movably connected with the second hinge support 432. The second hinge support 432 facilitates the movable connection between the lower end of the electric hydraulic push rod 43 and the support base plate 5. The upper end of the support column 44 is movably connected with the third hinge support 441. The third hinge support The seat 441 facilitates the movable connection between the upper end of the support column 44 and the modulation tank 1. An extension block 41 is arranged on the lower side of the left end surface of the modulation tank 1. The extension block 41 is connected to the modulation tank 1 by welding. A limiting vertical rod 42 is fixedly connected to the left side of the upper end surface of the support base plate 5. The bottom of the limiting vertical rod 42 is connected to the support base plate 5 by welding. The limiting vertical rod 42 and the extension block 41 can limit the downward movement range of the modulation tank 1 so that the modulation tank 1 can swing counterclockwise to a vertical state each time. A storage chamber 411 is opened on the right side inside the modulation tank 1. The storage chamber 411 matches the baffle plate 47. The storage chamber 411 facilitates the storage of the baffle plate 47 inside the modulation tank 1.

[0036] Working principle: the staff first opens the blocking cover 61 and pours the prepared multiple feed raw materials and feed additives into the modulation tank 1 through the feeding hopper 6 (in this process, the height of the poured feed raw materials and feed additives cannot exceed the bottom height of the feeding hopper 6). After the pouring is completed, the blocking cover 61 is clamped on the upper end of the feeding hopper 6 to prevent external dust from entering the feeding hopper 6. At this time, the low-speed motor 312 can be started, so that the low-speed motor 312 drives the transmission main shaft rod 313 to rotate at a low speed, and the transmission main shaft rod 313 will drive the multiple lower stirring rods to rotate together through the follower rod 39, so that the rotating multiple lower stirring rods 311 can stir, mix and modulate the feed raw materials and feed additives in the lower part of the modulation tank 1; at the same time, the transmission main shaft rod 313 will drive the first driving pulley 36 and the second driving pulley 35 to rotate together, so that the first driving pulley 36 drives the first transmission belt 314 and the first driven pulley 37 to rotate. The first driven rod 38 rotates, and the second active pulley 35 drives the second driven rod 32 to rotate through the second transmission belt 34 and the second driven pulley 33, thereby causing the first driven rod 38 and the second driven rod 32 to drive the multiple upper stirring rods 31 to rotate, so that the rotating multiple upper stirring rods 31 stir, mix and modulate the feed raw materials and feed additives in the upper part of the modulation tank 1, thereby comprehensively stirring and modulating the various feed raw materials and feed additives in the modulation tank 1; when the various feed raw materials and feed additives are stirred and modulated for the required time, the staff first turns off the low-speed motor 312, and then pushes the external material receiving trolley to an appropriate position below the discharge hopper 45, at which time the electric push rod 48 can be controlled to drive the baffle plate 47 to move upward and open through the connecting plate 46, and at the same time, the electric hydraulic push rod 43 is controlled to extend, so that the electric hydraulic push rod 43 drives the modulation tank 1 to swing clockwise through the first hinge support 431 (reference Figure 4 ), so that the tilted modulation tank 1 can quickly discharge the mixed feed after modulation inside, and the discharged mixed feed will pass through the discharge hopper 45 and slide into the external material receiving trolley. When all the mixed feed is discharged, the electric hydraulic push rod 43 is controlled to contract, so that the electric hydraulic push rod 43 drives the modulation tank 1 to swing counterclockwise through the first hinge support 431. During this process, the limiting vertical rod 42 will block and limit the extension block 41 to prevent the modulation tank 1 from swinging excessively counterclockwise, so as to adjust the tank to return to its initial position, and finally the electric push rod 48 drives the baffle plate 47 to move downward through the connecting plate 46 to close it.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pet food mixer, comprising a mixing tank (1), a protective cover (2), a supporting base plate (5), a feeding hopper (6) and a tank cover (7), characterized in that: The upper end surface of the modulation tank (1) is provided with a tank cover (7), the upper end surface of the tank cover (7) is provided with a protective cover (2), a supporting base plate (5) is provided below the modulation tank (1), and a feeding hopper (6) is provided on the left side of the annular side surface of the modulation tank (1); The bottom of the mixing tank (1) is provided with a discharge assembly (4), and the discharge assembly (4) is used to quickly discharge the pet feed prepared in the mixing tank (1); the mixing tank (1) is provided with a stirring assembly (3), and the stirring assembly (3) is used to stir and mix the various feed raw materials and feed additives poured into the mixing tank (1); The stirring assembly (3) comprises a follower rod (39), a lower stirring rod (311), a low-speed motor (312) and a transmission main shaft rod (313); the low-speed motor (312) is installed at the middle position of the bottom of the modulation tank (1); the upper end of the low-speed motor (312) is connected to the transmission main shaft rod (313); the follower rod (39) is arranged on the lower side of the annular side of the transmission main shaft rod (313); the lower stirring rod (311) is symmetrically arranged on the upper and lower sides of the annular side of the follower rod (39); The unloading assembly (4) comprises an electric hydraulic push rod (43), a support column (44), a discharge hopper (45), a connecting plate (46), a material blocking plate (47), an electric push rod (48) and a support plate (49); a discharge hopper (45) is arranged at the lower side of the right end surface of the modulation tank (1); a material blocking plate (47) is installed at the right side of the inside of the modulation tank (1); a connecting plate (46) is arranged at the lower side of the right end surface of the material blocking plate (47); an electric push rod (48) is installed at the upper end surface of the connecting plate (46); a support plate (49) is fixedly connected to the right side of the annular side surface of the modulation tank (1); an electric hydraulic push rod (43) is installed at the left side of the lower end surface of the modulation tank (1); and support columns (44) are symmetrically fixedly connected to the front and rear sides of the upper end surface of the support base plate (5).

2. A pet food mixer according to claim 1, characterized in that: A first driving pulley (36) is arranged on the upper side of the annular side surface of the transmission main shaft rod (313); a first driven pulley (37) is arranged on the left side of the first driving pulley (36); a first driven rod (38) is arranged at the lower end of the first driven pulley (37); a second driving pulley (35) is arranged on the upper end surface of the transmission main shaft rod (313); a second driven pulley (33) is arranged on the right side of the second driving pulley (35); a second driven rod (32) is arranged at the lower end of the second driven pulley (33); and a plurality of upper stirring rods (31) are arranged on the lower sides of the annular side surfaces of the second driven rod (32) and the first driven rod (38).

3. A pet food mixer according to claim 1, characterized in that: The upper end of the electric hydraulic push rod (43) is movably connected to a first hinge support (431), the bottom of the electric hydraulic push rod (43) is movably connected to a second hinge support (432), and the upper end of the support column (44) is movably connected to a third hinge support (441).

4. A pet food mixer according to claim 1, characterized in that: An extension block (41) is provided on the lower side of the left end surface of the modulation tank (1), a limiting vertical rod (42) is fixedly connected to the left side of the upper end surface of the support base plate (5), and a storage cavity (411) is provided on the right side inside the modulation tank (1).

5. A pet food mixer according to claim 2, characterized in that: A first transmission belt (314) is arranged between the first driving pulley (36) and the first driven pulley (37), a second transmission belt (34) is arranged between the second driving pulley (35) and the second driven pulley (33), a first limiting plate (381) is arranged on the upper side of the annular side of the first driven rod (38), and a second limiting plate (321) is arranged on the upper side of the annular side of the second driven rod (32).

6. A pet food mixer according to claim 1, characterized in that: Annular blocking covers (71) are symmetrically mounted on the left and right sides of the upper end surface of the tank cover (7), a blocking cover (61) is clamped on the upper end surface of the feeding hopper (6), and an observation window is arranged on the upper side of the front end surface of the mixing tank (1).

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