A mixing device for processing food additive calcium carbonate

Abstract

This application provides a mixing device for processing calcium carbonate, a food additive, relating to the field of calcium carbonate processing technology. The device includes: a feeding mechanism comprising a conveying pipe and a first moving member, the first moving member driving the conveying pipe to detachably connect with the inlet pipe, the conveying pipe acting on a first valve and driving the first valve to open and close; and a discharging mechanism comprising a conveying hopper, a second moving member, and an opening / closing drive member, the second moving member driving the conveying hopper to move towards or away from the discharging pipe, and the opening / closing drive member being mounted on the conveying hopper and capable of driving the second valve to open and close. The first moving member drives the conveying pipe to connect with the inlet pipe, and the conveying pipe acts on the first valve to open it, then the material is fed into the tank through the conveying pipe. After mixing is complete, the opening / closing drive member drives the second valve to open, allowing the material in the tank to be discharged from the discharging pipe into the conveying hopper, thereby increasing the feeding and discharging speeds.

Description

Technical Field

[0001] This application relates to the field of calcium carbonate processing technology, and in particular to a mixing device for processing calcium carbonate as a food additive. Background Technology

[0002] Calcium carbonate, a food additive, is widely used in the food industry, primarily serving to supplement calcium, regulate pH, and improve food texture and stability. During its production, calcium carbonate raw materials from different batches, with varying particle sizes and properties, often require thorough and uniform mixing to ensure consistent product parameters such as calcium content, particle size distribution, and whiteness across batches, meeting the quality stability requirements of food manufacturers. Other auxiliary ingredients, such as lubricants and anti-caking agents, may be added to the calcium carbonate raw materials. Mixing allows for precise formulation and uniform mixing of these components with the calcium carbonate, maximizing the additive's effectiveness in food. Therefore, a mixing machine is necessary to ensure uniform mixing of different materials. Currently, the most commonly used mixing machine in the production of calcium carbonate is the double cone mixer.

[0003] For example, utility model publication CN221249435U discloses a mixing structure for a double-cone mixer, including two mounting boxes. A rotating cylinder is rotatably mounted between the two mounting boxes. Mounting plates are welded and fixed to the lower surface of each mounting box. A double-cone mixing barrel is fixedly fitted onto the middle of the outer arc surface of the rotating cylinder. A feed pipe is installed at the feed inlet on the upper surface of the double-cone mixing barrel, and a stop valve is connected in series inside the feed pipe. A discharge pipe is installed at the discharge outlet on the lower surface of the double-cone mixing barrel, and a stop valve is connected in series inside the discharge pipe. Through the cooperation of the rotation of the double-cone mixing barrel itself and the rotation of the stirring paddle, the materials inside the double-cone mixing barrel can be stirred and mixed evenly.

[0004] However, because the mixing drum needs to rotate during operation, the mixing drum's inlet pipe is separate from the feeding equipment, and the mixing drum's outlet pipe is separate from the discharge conveying equipment. Furthermore, both the inlet valve (stop valve one) and the outlet valve (stop valve two) are manual valves. This means that when adding material to or discharging material from the mixing drum, the operator must manually open either stop valve one or stop valve two, and then connect the feeding equipment to the inlet pipe or the outlet pipe to the discharge conveying equipment via a pipeline to allow material to be fed and discharged. Therefore, the feeding and discharging speeds are slow, limiting production efficiency and increasing the workload for operators. Utility Model Content

[0005] The purpose of this application is to provide a mixing device for processing calcium carbonate, a food additive, to solve the problems of slow feeding and discharging speeds in related technologies, which limit the improvement of production efficiency and cause high labor intensity for operators.

[0006] The mixing device for processing calcium carbonate, a food additive, provided in this application adopts the following technical solution:

[0007] A mixing device for processing calcium carbonate, a food additive, includes a base and a tank. The tank is rotatably mounted on the base. An inlet pipe and an outlet pipe are respectively provided at both ends of the tank. The base is equipped with a rotary drive for driving the tank to rotate. The device also includes:

[0008] The first valve is located on the feed pipe;

[0009] The second valve is located on the discharge pipe;

[0010] The feeding mechanism includes a conveying pipe and a first moving part. The first moving part is used to drive the conveying pipe to be detachably connected with the feeding pipe. The conveying pipe can act on the first valve and drive the first valve to open.

[0011] The discharge mechanism includes a hopper, a second moving part, and an opening / closing drive. The second moving part is used to drive the hopper to move toward or away from the discharge pipe. The opening / closing drive is located on the hopper and can drive the second valve to open or close.

[0012] Optionally, the first valve includes a valve plate and a first elastic element. The valve plate is rotatably disposed inside the feed pipe. When the feed pipe is connected to the feed pipe, the valve plate can be driven to rotate and open through the first transmission component. When the feed pipe is separated from the feed pipe, the first elastic element can drive the valve plate to rotate and close through the first transmission component.

[0013] Optionally, the first transmission assembly includes a rack, the valve plate is connected to the feed pipe via a pivot, a gear is provided on the pivot, the rack is slidably disposed on the feed pipe and meshes with the gear, when the feed pipe is connected to the feed pipe, it can push the rack, the first elastic element can act on the rack, and push the rack to reset after the feed pipe is separated from the feed pipe.

[0014] Optionally, the feeding mechanism further includes a first locking member. After the conveying pipe is separated from the feeding pipe, the first locking member can lock the valve plate in a closed state. Before the conveying pipe is connected to the feeding pipe, the conveying pipe can act on the first locking member and release the locking member from the valve plate.

[0015] Optionally, the second valve includes a baffle, a screw, a sliding sleeve, and a connecting rod. The baffle is hinged to the discharge pipe and can be opened and closed to seal the end of the discharge pipe. The sliding sleeve is slidably disposed on the discharge pipe. The two ends of the connecting rod are respectively hinged to the sliding sleeve and the baffle. A threaded sleeve is provided on the sliding sleeve. The screw is rotatably disposed on the discharge pipe and screwed to the threaded sleeve.

[0016] Optionally, the diameter of the discharge pipe is larger than the diameter of the feed pipe, and two baffles are provided, which are hinged to each other on the discharge pipe.

[0017] Optionally, the opening and closing drive component includes a transmission rod and an opening and closing drive motor. The transmission rod is rotatably mounted on the conveying hopper, and the opening and closing drive motor is fixed on the conveying hopper and connected to the transmission rod. The end of the transmission rod is provided with a square protrusion, and the screw is provided with a sleeve that matches the square protrusion. When the second moving component drives the conveying hopper to move towards the discharge pipe, it can drive the square protrusion to engage with the sleeve.

[0018] Optionally, the discharge mechanism further includes a second locking member. When the second moving member drives the conveying hopper to move away from the discharge pipe, the second locking member can lock the baffle in a closed state. When the second moving member drives the conveying hopper to move closer to the discharge pipe, it can act on the second locking member and release the second locking member from locking the baffle.

[0019] In summary, this application includes at least the following beneficial technical effects: When the mixing device for processing calcium carbonate, a food additive, is in operation, the conveying pipe is connected to the feeding device for the calcium carbonate raw material via a flexible hose, and the conveying hopper is connected to the discharging conveying device via a flexible hose. When mixing the calcium carbonate raw material is required, the first moving component drives the conveying pipe to connect with the feeding pipe, and the conveying pipe acts on the first valve to open it. Then, the feeding device for the calcium carbonate raw material inputs material into the tank through the conveying pipe. The first moving component then drives the conveying pipe to separate from the feeding pipe and closes the first valve. Next, the rotating drive component drives the tank to rotate, mixing the material inside the tank evenly. After mixing is complete, the opening and closing drive component drives the second valve to open, allowing the material inside the tank to be discharged from the discharging pipe into the conveying hopper, and then discharged by the discharging conveying device. This increases the feeding and discharging speed, thereby improving production efficiency and reducing the labor intensity of operators. Attached Figure Description

[0020] Figure 1 This is a first-view cross-sectional view of the mixing device for processing calcium carbonate, a food additive, in an embodiment of this application.

[0021] Figure 2 This is a cross-sectional view from a second perspective of the mixing apparatus for processing calcium carbonate, a food additive, in an embodiment of this application.

[0022] Figure 3 for Figure 2 A magnified view of part B in the middle section;

[0023] Figure 4 This is a schematic diagram of the feeding mechanism in the embodiments of this application;

[0024] Figure 5 for Figure 4 A magnified view of part C in the middle;

[0025] Figure 6 for Figure 1 A magnified view of part A in the diagram.

[0026] Explanation of reference numerals in the attached figures:

[0027] 10. Base; 20. Tank; 21. Feed pipe; 212. Base; 213. Support; 214. First clearance groove; 215. Horizontal groove; 216. Vertical hole; 22. Discharge pipe; 221. Bracket; 222. Vertical cylinder; 223. Guide sleeve; 224. Second clearance groove; 23. Main shaft; 24. Agitator blade;

[0028] 30. First valve; 31. Valve plate; 311. Pivot; 312. Gear; 32. Spring;

[0029] 40. Feeding mechanism; 41. Conveying pipe; 411. Flange; 412. Column; 42. First moving part; 43. Rack; 431. Base; 432. Guide post; 433. Plate; 434. First pin hole; 44. First locking pin; 441. First radial boss; 442. Slider; 443. Through groove; 444. First wedge block; 45. First compression spring;

[0030] 50. Discharge mechanism; 51. Feed hopper; 52. Second moving part; 53. Transmission rod; 531. Square protrusion; 54. Opening and closing drive motor; 55. Second locking pin; 551. Second radial boss; 56. Second wedge block; 57. Second compression spring; 58. Connecting plate;

[0031] 60. Second valve; 61. Baffle; 611. First hinge shaft; 62. Screw; 621. Sleeve; 622. Second pin hole; 63. Sliding sleeve; 631. Threaded sleeve; 64. Connecting rod; 641. Second hinge shaft; 70. Rotary drive component. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1 -Appendix Figure 6This application will be described in further detail below.

[0033] This application discloses a mixing device for processing calcium carbonate, a food additive.

[0034] A mixing device for processing calcium carbonate, a food additive, includes a base 10, a tank 20, a rotary drive 70, a first valve 30, a second valve 60, a feeding mechanism 40, and a discharging mechanism 50.

[0035] Reference Figures 1 to 3 A main shaft 23 is fixedly mounted on the tank body 20. A stirring blade 24 is mounted on the main shaft 23 located inside the tank body 20. The tank body 20 is rotatably mounted on the base 10 via the main shaft 23. A rotary drive 70 is fixed on the base 10. The rotary drive 70 can be a geared motor, which is connected to the main shaft 23. The rotary drive 70 is used to drive the tank body 20 to rotate.

[0036] The tank body 20 has an inlet pipe 21 and an outlet pipe 22 at its two ends, respectively, and a first valve 30 is located on the inlet pipe 21. The feeding mechanism 40 includes a conveying pipe 41, a first moving part 42, and a first locking part. The conveying pipe 41 is located above the tank body 20, and its upper end is connected to the feeding equipment for the food additive calcium carbonate raw material via a flexible hose. The first moving part 42 is located on the base 10 and is used to drive the conveying pipe 41 to be detachably connected to the inlet pipe 21. The first moving part 42 can be a first linear screw module. The conveying pipe 41 can act on the first valve 30 and drive the first valve 30 to open.

[0037] In an optional embodiment, the structure of the first valve 30 and the principle of opening and closing of the valve plate 31 are as follows: The first valve 30 includes a valve plate 31 and a first elastic element. The valve plate 31 can be flipped and disposed inside the feed pipe 21. When the feed pipe 41 is connected to the feed pipe 21, the valve plate 31 can be flipped and opened by the first transmission component. When the feed pipe 41 is separated from the feed pipe 21, the first elastic element can be flipped and closed by the first transmission component.

[0038] The first transmission assembly includes a rack 43. A valve plate 31 is connected to the feed pipe 21 via a pivot 311. A gear 312 is mounted on the pivot 311. The rack 43 is slidably mounted on the feed pipe 21 and meshes with the gear 312. When the feed pipe 41 connects with the feed pipe 21, it pushes the rack 43. The rack 43 then drives the gear 312, pivot 311, and valve plate 31 to rotate, thereby causing the valve plate 31 to flip open. A first elastic element acts on the rack 43 and, after the feed pipe 41 separates from the feed pipe 21, pushes the rack 43 to move in the opposite direction and reset, thereby causing the gear 312, pivot 311, and valve plate 31 to rotate in the opposite direction, driving the valve plate 31 to flip and close.

[0039] More specifically, the specific structure of the first elastic element and its connection with the rack 43 are as follows: The first elastic element is a spring 32. The rack 43 is provided with a seat 431, the seat 431 is provided with a guide post 432, and the guide post 432 is provided with a plate 433. The feed pipe 21 is provided with a base 212, the guide post 432 slides through the base 212, the seat 431 and the plate 433 are respectively located on both sides of the base 212, the spring 32 is sleeved on the outside of the guide post 432, and the two ends of the spring 32 abut against the base 212 and the plate 433 respectively. The conveying pipe 41 is provided with a flange 411, which can push the plate 433 through the flange 411 when the conveying pipe 41 is connected to the feed pipe 21.

[0040] Reference Figures 3 to 5 After the conveying pipe 41 separates from the feed pipe 21, the first locking member can lock the valve plate 31 in the closed state to prevent the valve plate 31 from accidentally opening and causing material leakage during the mixing process. Before the conveying pipe 41 connects with the feed pipe 21, the conveying pipe 41 can act on the first locking member and release the locking member from the valve plate 31, thereby driving the valve plate 31 to open and realize feeding.

[0041] In an optional embodiment, the specific structure of the first locking member and the specific functional relationship between the feed pipe 41 and the first locking member are as follows: The first locking member includes a first locking pin 44 and a first compression spring 45. A first pin hole 434 is provided on the rack 43, and a support 213 is provided on the base 212. The first locking pin 44 slides through the support 213. A first radial boss 441 is provided on the first locking pin 44, and a first clearance groove 214 for avoiding the first radial boss 441 is provided on the support 213. The first compression spring 45 is sleeved on the outside of the first locking pin 44, and the two ends of the first compression spring 45 abut against the end faces of the first radial boss 441 and the first clearance groove 214, respectively. The first locking pin 44 can be inserted into the first pin hole 434 under the elastic force of the first compression spring 45. The support 213 is provided with a transverse groove 215 and a vertical hole 216 communicating with the transverse groove 215. The first locking pin 44 is provided with a slider 442, which is located in the transverse groove 215. The slider 442 is provided with a through groove 443, and a first wedge block 444 is provided on the side wall of the through groove 443 away from the first locking pin 44. The flange 411 of the feed pipe 41 is provided with a column 412. When the feed pipe 41 is connected to the feed pipe 21, the column 412 can be inserted into the vertical hole 216 and push against the inclined surface of the first wedge block 444.

[0042] Reference Figure 1 , Figure 2 and Figure 6The second valve 60 is located on the discharge pipe 22. In an optional embodiment, the specific structure of the second valve 60 and its connection with the discharge pipe 22 are as follows: The second valve 60 includes a baffle 61, a screw 62, a sliding sleeve 63, and a connecting rod 64. The baffle 61 is hinged on the discharge pipe 22 and can be opened and closed to seal the end of the discharge pipe 22. The diameter of the discharge pipe 22 is larger than the diameter of the inlet pipe 21, which is conducive to the material being discharged from the tank 20 after mixing. There are two baffles 61. The two baffles 61 are hinged on the discharge pipe 22 through the first hinge shaft 611. The baffles 61 adopt a split opening and closing structure, which can reduce the obstruction of the material, thereby further facilitating the material being discharged from the tank 20 after mixing. The sliding sleeve 63 is slidably mounted on the discharge pipe 22. The two ends of the connecting rod 64 are respectively hinged to the sliding sleeve 63 and the baffle 61 through the second hinge shaft 641. The sliding sleeve 63 is provided with a screw sleeve 631. The screw 62 is rotatably mounted on the discharge pipe 22 and screwed to the screw sleeve 631.

[0043] The discharge mechanism 50 includes a hopper 51, a second moving part 52, an opening and closing drive part, and a second locking part. The hopper 51 is located below the tank body 20, and its lower end is connected to the discharge conveying equipment via a flexible hose. The second moving part 52 is mounted on the base 10 and is used to drive the hopper 51 to move towards or away from the discharge pipe 22. The second moving part 52 may be a second linear screw module.

[0044] An opening and closing drive is mounted on the hopper 51 and can drive the second valve 60 to open and close. More specifically, the opening and closing drive includes a transmission rod 53 and an opening and closing drive motor 54. The transmission rod 53 is rotatably mounted on the hopper 51, and the opening and closing drive motor 54 is fixed on the hopper 51 and connected to the transmission rod 53. The end of the transmission rod 53 is provided with a square protrusion 531, and the screw 62 is provided with a sleeve 621 that is adapted to the square protrusion 531. When the second moving member 52 drives the hopper 51 to move towards the discharge pipe 22, it can drive the square protrusion 531 to engage with the sleeve 621.

[0045] Reference Figure 6 When the second moving member 52 drives the conveying hopper 51 to move away from the discharge pipe 22, the second locking member can lock the baffle 61 in the closed state to prevent the baffle 61 from accidentally opening and causing material leakage during the mixing process. When the second moving member 52 drives the conveying hopper 51 to move closer to the discharge pipe 22, it can act on the second locking member and release the second locking member from locking the baffle 61, so that the opening and closing drive member can drive the baffle 61 to open and realize material discharge.

[0046] In an optional embodiment, the specific structure of the second locking member is as follows: The second locking member includes a second locking pin 55, a second wedge block 56, and a second compression spring 57. A bracket 221 is provided on the discharge pipe 22, and a vertical cylinder 222 is provided on the bracket 221. A sleeve 621 is located inside the vertical cylinder 222, and a transversely penetrating guide sleeve 223 is provided on the vertical cylinder 222. A second pin hole 622 is provided on the screw 62, and the second locking pin 55 slides through the bracket 221. A second radial boss 551 is provided on the second locking pin 55, and a second clearance groove 224 for avoiding the second radial boss 551 is provided on the bracket 221. The second compression spring 57 is sleeved on the outside of the second locking pin 55, and the two ends of the second compression spring 57 abut against the end faces of the second radial boss 551 and the second clearance groove 224, respectively. The second locking pin 55 can be inserted into the second pin hole 622 under the elastic force of the second compression spring 57. The second wedge block 56 is slidably inserted into the guide sleeve 223 and extends into the vertical cylinder 222. The second wedge block 56 is fixed to the second locking pin 55 through the connecting plate 58. When the second moving member 52 drives the conveying hopper 51 to move towards the discharge pipe 22, the transmission rod 53 can be inserted into the vertical cylinder 222 and push against the inclined surface of the second wedge block 56.

[0047] The implementation principle of the mixing device for processing calcium carbonate, a food additive, in this embodiment is as follows: When it is necessary to mix the raw materials of calcium carbonate, a food additive, the first moving part 42 drives the conveying pipe 41 to move down and connect with the feeding pipe 21, so that the conveying pipe 41 is sleeved on the outside of the feeding pipe 21. During the downward movement of the conveying pipe 41, the column 412 is inserted into the vertical hole 216 of the support 213 and pushes the inclined surface of the first wedge block 444, so that the slider 442 slides along the transverse groove 215 and drives the first locking pin 44 to exit from the first pin hole 434, thereby releasing the lock on the valve plate 31.

[0048] Next, the feed pipe 41 continues to move downwards and pushes the plate 433 through the flange 411, causing the rack 43 to slide. The rack 43 then drives the gear 312, pivot 311, and valve plate 31 to rotate, causing the valve plate 31 to flip open. Next, the feeding device for the food additive calcium carbonate raw material inputs material into the tank 20 through the feed pipe 41. After feeding is completed, the first moving part 42 drives the feed pipe 41 to separate from the feed pipe 21. Then, under the elastic force of the first elastic element, the rack 43 is pushed to move in the opposite direction to reset, causing the gear 312, pivot 311, and valve plate 31 to rotate in the opposite direction, driving the valve plate 31 to flip and close. Next, the column 412 separates from the first wedge block 444. Under the elastic force of the first compression spring 45, the first locking pin 44 is pushed to engage with the first pin hole 434, locking the valve plate 31. Then, the rotating drive 70 drives the tank 20 to rotate, and the stirring blades 24 mix the material in the tank 20 evenly.

[0049] After mixing is complete, the second moving part 52 drives the conveying hopper 51 to move closer to the discharge pipe 22, inserting the transmission rod 53 into the vertical cylinder 222 and engaging it with the sleeve 621. During this process, the transmission rod 53 pushes against the inclined surface of the second wedge block 56, causing the second wedge block 56 to slide along the guide sleeve 223. Then, the connecting plate 58 drives the second locking pin 55 to exit from the second pin hole 622 of the screw 62, releasing the lock on the baffle 61. Next, the opening and closing drive motor 54 drives the transmission rod 53 to rotate, which in turn drives the screw 62 to rotate. The screw 62 then drives the sliding sleeve 63 to move upward, and the connecting rod 64 drives the baffle 61 to open, allowing the material in the tank 20 to be discharged from the discharge pipe 22 into the conveying hopper 51, and then discharged by the discharge conveying equipment.

[0050] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A mixing device for processing calcium carbonate, a food additive, comprising a base (10) and a tank (20), wherein the tank (20) is rotatably mounted on the base (10), and the tank (20) has an inlet pipe (21) and an outlet pipe (22) respectively at both ends, and the base (10) is provided with a rotary drive component (70) for driving the tank (20) to rotate, characterized in that, Also includes: The first valve (30) is located on the feed pipe (21); The second valve (60) is located on the discharge pipe (22); The feeding mechanism (40) includes a conveying pipe (41) and a first moving part (42). The first moving part (42) is used to drive the conveying pipe (41) to be detachably connected with the feeding pipe (21). The conveying pipe (41) can act on the first valve (30) and drive the first valve (30) to open. The discharge mechanism (50) includes a hopper (51), a second moving part (52), and an opening and closing drive. The second moving part (52) is used to drive the hopper (51) to move toward or away from the discharge pipe (22). The opening and closing drive is provided on the hopper (51) and can drive the second valve (60) to open and close.

2. The mixing device for processing calcium carbonate, a food additive, according to claim 1, is characterized in that, The first valve (30) includes a valve plate (31) and a first elastic element. The valve plate (31) is rotatably disposed inside the feed pipe (21). When the feed pipe (41) is connected to the feed pipe (21), the valve plate (31) can be rotatably opened by the first transmission component. When the feed pipe (41) is separated from the feed pipe (21), the first elastic element can be rotatably closed by the first transmission component.

3. The mixing device for processing calcium carbonate, a food additive, according to claim 2, is characterized in that, The first transmission assembly includes a rack (43), the valve plate (31) is connected to the feed pipe (21) via a pivot (311), the pivot (311) is provided with a gear (312), the rack (43) is slidably disposed on the feed pipe (21) and meshes with the gear (312), when the feed pipe (41) is connected to the feed pipe (21), it can push the rack (43), the first elastic element can act on the rack (43), and push the rack (43) to reset after the feed pipe (41) is separated from the feed pipe (21).

4. The mixing device for processing calcium carbonate, a food additive, according to claim 2, is characterized in that, The feeding mechanism (40) also includes a first locking member. After the feeding pipe (41) is separated from the feeding pipe (21), the first locking member can lock the valve plate (31) in a closed state. Before the feeding pipe (41) is connected to the feeding pipe (21), the feeding pipe (41) can act on the first locking member and release the locking of the valve plate (31) by the first locking member.

5. The mixing device for processing calcium carbonate, a food additive, according to claim 1, is characterized in that, The second valve (60) includes a baffle (61), a screw (62), a sliding sleeve (63), and a connecting rod (64). The baffle (61) is hinged to the discharge pipe (22) and can be opened and closed to seal the end of the discharge pipe (22). The sliding sleeve (63) is slidably disposed on the discharge pipe (22). The two ends of the connecting rod (64) are respectively hinged to the sliding sleeve (63) and the baffle (61). The sliding sleeve (63) is provided with a screw sleeve (631). The screw (62) is rotatably disposed on the discharge pipe (22) and screwed to the screw sleeve (631).

6. The mixing device for processing calcium carbonate, a food additive, according to claim 5, is characterized in that, The diameter of the discharge pipe (22) is larger than the diameter of the feed pipe (21). Two baffles (61) are provided, and the two baffles (61) are hinged to each other on the discharge pipe (22).

7. A mixing device for processing calcium carbonate, a food additive, according to claim 5, characterized in that, The opening and closing drive component includes a transmission rod (53) and an opening and closing drive motor (54). The transmission rod (53) is rotatably mounted on the conveying hopper (51). The opening and closing drive motor (54) is fixed on the conveying hopper (51) and connected to the transmission rod (53). The end of the transmission rod (53) is provided with a square protrusion (531). The screw (62) is provided with a sleeve (621) that is adapted to the square protrusion (531). When the second moving component (52) drives the conveying hopper (51) to move towards the discharge pipe (22), it can drive the square protrusion (531) to engage with the sleeve (621).

8. A mixing device for processing calcium carbonate, a food additive, according to claim 5, characterized in that, The discharge mechanism (50) also includes a second locking member. When the second moving member (52) drives the hopper (51) to move away from the discharge pipe (22), the second locking member can lock the baffle (61) to a closed state. When the second moving member (52) drives the hopper (51) to move closer to the discharge pipe (22), it can act on the second locking member and release the second locking member from locking the baffle (61).

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