A stirring machine for producing calcium carbonate

Abstract

This utility model discloses a mixer for calcium carbonate production, including a drive motor, a mixing shaft, a gearbox, and a mounting base. The drive motor is connected to the gearbox, which is connected to the mixing shaft. The drive motor and gearbox are mounted on the mounting base. The mixing shaft has a first blade and a second blade, which are connected to the mixing shaft via a first overrunning clutch. The top end of the second blade is connected to the mounting base via a second overrunning clutch. The mixing shaft has a first sine groove, and a first slip ring is provided on the outer wall of the mixing shaft. A first pin is provided on the first slip ring, extending into the first sine groove. A scraper is fitted on the first blade, and a connecting rod connects the scraper and the first slip ring, with both ends of the connecting rod hinged to the scraper and the first slip ring, respectively. This utility model achieves automatic switching between "mixing-self-cleaning" dual modes by switching the forward and reverse rotation of the mixing shaft, eliminating the need for manual cleaning and effectively reducing downtime, thus improving production efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of calcium carbonate processing equipment, specifically to a mixer for calcium carbonate production. Background Technology

[0002] Light calcium carbonate, also known as precipitated calcium carbonate, or simply light calcium carbonate, is used as a filler in industries such as rubber, plastics, papermaking, coatings, and inks. Light calcium carbonate is produced through a chemical processing method. In its production, limestone is calcined to obtain quicklime. This quicklime is then mixed with water and stirred to undergo a slaking reaction, producing lime slurry. Lime slurry often adheres to the impeller and shaft of the mixer. If this lime slurry is not removed promptly, it becomes extremely difficult to remove once it solidifies, affecting its usability. Existing mixers typically require manual cleaning after periodic shutdowns, which is inefficient and impacts production efficiency.

[0003] Chinese Patent Publication No. CN221267775U discloses a calcium carbonate liquid stirring device for calcium carbonate production, including a stirring drum with a detachable cover. A positioning rod is longitudinally arranged inside the drum, with its upper end fixed to the cover. A stirring assembly for stirring the calcium carbonate liquid is mounted on the positioning rod. The stirring assembly includes a first stirring plate and a second stirring plate rotatably mounted on the positioning rod, rotating in opposite directions. The first stirring plate is located outside the second stirring plate, and the first and second stirring plates are staggered. A wall-scraping assembly is also provided inside the drum to scrape away calcium carbonate adhering to the drum wall during stirring. However, this patent can only scrape away calcium carbonate adhering to the drum wall; it cannot scrape away material adhering to the stirring blades and shaft. After prolonged use, the calcium carbonate on the blades solidifies, requiring manual removal after machine shutdown, which affects production efficiency. Summary of the Invention

[0004] The main objective of this invention is to overcome the deficiencies of the prior art and provide a mixer for calcium carbonate production.

[0005] To achieve the above objectives, the present invention proposes a mixer for calcium carbonate production, comprising a drive motor, a mixing shaft, a reduction gearbox, and a mounting base. The conveying end of the drive motor is connected to the input end of the reduction gearbox, and the output end of the reduction gearbox is connected to one end of the mixing shaft. Both the drive motor and the reduction gearbox are mounted on the mounting base. The mixing shaft is equipped with a first blade and a second blade. The bottom ends of the first blade and the second blade are connected to the bottom end of the mixing shaft via a first overrunning clutch, and the top end of the second blade is connected to the mounting base via a second overrunning clutch. The bottom of the base is connected, and the outer wall of the lower section of the stirring shaft is provided with a first sinusoidal groove. The first sinusoidal groove intersects at both ends to form a closed oblique annular groove. A first slip ring is movably sleeved on the outer wall of the stirring shaft. The middle part of the second blade passes through the first slip ring. A first pin is horizontally provided on the inner wall of the first slip ring. One end of the first pin extends into the first sinusoidal groove. A scraper is movably sleeved on the first blade. A connecting rod is connected between the scraper and the first slip ring. The two ends of the connecting rod are respectively hinged to the scraper and the first slip ring.

[0006] To further optimize the technical solution, both the first blade and the second blade are straight plates. The first blade is perpendicularly connected to the stirring shaft, and the second blade surrounds the periphery of the stirring shaft and is parallel to the stirring shaft.

[0007] To further optimize the technical solution, the first overrunning clutch includes a first internal gear ratchet, a first pawl, and a first mounting plate. The first mounting plate is fixed on the stirring shaft. The first internal gear ratchet is rotatably sleeved on the periphery of the first mounting plate. The first blade is connected to the outer peripheral wall of the first internal gear ratchet. The bottom end of the second blade is connected to the upper end of the first internal gear ratchet. The first pawl is rotatably mounted on the first mounting plate and is provided with a first spring.

[0008] Further optimizing the technical solution, the second overrunning clutch includes a second internal gear ratchet, a second pawl, and a second mounting plate. The second mounting plate is rotatably mounted on the stirring shaft. The second internal gear ratchet is fixedly mounted on the bottom end of the mounting base. The top end of the second blade is connected to the bottom surface of the second mounting plate. The second pawl is rotatably mounted on the second mounting plate, and a second spring is provided on the second pawl.

[0009] To further optimize the technical solution, a second sinusoidal groove is provided on the outer wall of the upper section of the stirring shaft. The two ends of the second sinusoidal groove intersect to form a closed oblique annular groove. A second slip ring is movably sleeved on the outer wall of the stirring shaft. A second pin is horizontally provided on the inner wall of the second slip ring. One end of the second pin extends into the second sinusoidal groove. The middle part of the second blade passes through the second slip ring.

[0010] To further optimize the technical solution, rollers are provided on both the first and second pins, and the wheel surfaces of the rollers respectively cooperate with the groove surfaces of the corresponding first and second sine grooves.

[0011] To further optimize the technical solution, the groove depth of the first sine groove and the second sine groove is 1.2-1.5 times the diameter of the first pin and the second pin, and the groove width of the first sine groove and the second sine groove is slightly larger than the outer diameter of the roller.

[0012] To further optimize the technical solution, the scraper block is provided with a first through hole for the first blade to pass through, and both the first slip ring and the second slip ring are provided with a second through hole for the second blade to pass through.

[0013] To further optimize the technical solution, the top surface of the scraper is provided with a first mounting ear, the outer peripheral wall of the first slip ring is provided with a second mounting ear, and the two ends of the connecting rod are respectively hinged to the first mounting ear and the second mounting ear.

[0014] To further optimize the technical solution, a mounting crossbar is fixedly provided at the bottom of the mounting base.

[0015] The beneficial effects of this utility model include: when the drive motor drives the stirring shaft to rotate forward, the first overrunning clutch is engaged with the stirring shaft, and the second overrunning clutch is overrunning with the mounting base. The first and second blades rotate synchronously to stir the lime slurry. The radial shear force of the first and second blades and the axial cyclic force combine to form a three-dimensional turbulent field, which can effectively improve the stirring effect. After stirring is completed, the drive motor drives the stirring shaft to rotate in reverse. The first overrunning clutch is overrunning, and the second overrunning clutch is engaged. The second and first blades are stationary. The stirring shaft drives the first pin to move up and down reciprocally in the first sine slide groove, which in turn drives the first slip ring to move up and down reciprocally on the stirring shaft and the second blade, scraping off the lime slurry stuck to the stirring shaft and the second blade. During the up and down movement, the first slip ring moves horizontally back and forth by pushing and pulling the scraper block through the connecting rod to scrape off the lime slurry stuck to the first blade. The automatic conversion between the "stirring-self-cleaning" dual modes is realized by switching between forward and reverse rotation. The mixer does not need to be stopped to manually clean the material stuck to the blades and stirring shaft, which effectively reduces downtime and improves production efficiency. Attached Figure Description

[0016] Figure 1 This is an overall schematic diagram of the mixer used for calcium carbonate production in this embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the installation of the first overrunning clutch in an embodiment of this utility model.

[0018] Figure 3 This is a schematic diagram of the installation of the second overrunning clutch in an embodiment of this utility model.

[0019] Figure 4 This is a schematic diagram of the first slip ring in an embodiment of this utility model.

[0020] Figure 5 This is a schematic diagram of the second slip ring in an embodiment of this utility model.

[0021] Figure 6 This is a schematic diagram of the scraper block in an embodiment of this utility model.

[0022] Reference numerals: 1 Drive motor; 2 Stirring shaft; 201 First sine groove; 202 Second sine groove; 3 Gearbox; 4 Mounting base; 5 First blade; 6 Second blade; 7 First overrunning clutch; 701 First internal gear ratchet; 702 First pawl; 703 First mounting plate; 704 First spring; 8 Second overrunning clutch; 801 Second internal gear ratchet; 802 Second pawl; 803 Second mounting plate; 804 Second spring; 9 First slip ring; 901 First pin; 902 Roller; 903 Second through hole; 904 Second mounting ear; 10 Scraper; 101 First through hole; 102 First mounting ear; 11 Connecting rod; 12 Second slip ring; 121 Second pin; 13 Mounting crossbar. Detailed Implementation

[0023] To make the technical problems, technical solutions, and beneficial effects of the embodiments of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0024] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component. Furthermore, a connection can be for both fixing and circuit connection purposes.

[0025] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] Please see Figures 1 to 6In one embodiment, a mixer for calcium carbonate production is disclosed, comprising a drive motor 1, a mixing shaft 2, a reduction gearbox 3, and a mounting base 4. The conveying end of the drive motor 1 is connected to the input end of the reduction gearbox 3, and the output end of the reduction gearbox 3 is connected to one end of the mixing shaft 2. Both the drive motor 1 and the reduction gearbox 3 are mounted on the mounting base 4. The power output from the drive motor 1 is reduced by the reduction gearbox 3 and then drives the mixing shaft 2 to operate in both forward and reverse directions. A first blade 5 and a second blade 6 are provided on the mixing shaft 2. The bottom ends of the first blade 5 and the second blade 6 are connected to the bottom end of the mixing shaft 2 through a first overrunning clutch 7, and the top end of the second blade 6 is connected through a second overrunning clutch 7. The overrunning clutch 8 is connected to the bottom of the mounting base 4. The outer wall of the lower section of the stirring shaft 2 is provided with a first sine groove 201. The first sine groove 201 intersects at both ends to form a closed oblique annular groove. A first slip ring 9 is movably sleeved on the outer wall of the stirring shaft 2. The middle part of the second blade 6 passes through the first slip ring 9. A first pin 901 is horizontally provided on the inner wall of the first slip ring 9. One end of the first pin 901 extends into the first sine groove 201. A scraper 10 is movably sleeved on the first blade 5. A connecting rod 11 is connected between the scraper 10 and the first slip ring 9. The two ends of the connecting rod 11 are respectively hinged to the scraper 10 and the first slip ring 9. Specifically, the first blade 5 and the second blade 6 are both straight plates. The tilt angle of the first blade 5 is 60° and the tilt angle of the second blade 6 is 45°. The first blade 5 is perpendicularly connected to the stirring shaft 2. The second blade 6 is arranged in a ring around the outside of the stirring shaft 2 and is parallel to the stirring shaft 2. The scraper block 10 is provided with a first through hole 101 for the first blade 5 to pass through. The first slip ring 9 and the second slip ring 12 are both provided with a second through hole 903 for the second blade 6 to pass through. The top surface of the scraper block 10 is provided with a first mounting ear 102. The outer peripheral wall of the first slip ring 9 is provided with a second mounting ear 904. The two ends of the connecting rod 11 are respectively hinged to the first mounting ear 102 and the second mounting ear 904.In this embodiment, when the drive motor 1 rotates forward, it synchronously drives the stirring shaft 2 to rotate forward. At this time, the first overrunning clutch 7 is engaged with the stirring shaft 2 to transmit torque, while the second overrunning clutch 8 is in an overrunning state with the mounting base 4 to not transmit torque. The first impeller 5 and the second impeller 6 rotate synchronously to stir during the calcium carbonate digestion reaction. The radial shear force of the first impeller 5 and the second impeller 6, combined with the axial cyclic force, forms a three-dimensional turbulent field, which can effectively improve the stirring effect. After stirring is completed, the drive motor 1 drives the stirring shaft 2 to rotate in reverse. At this time, the first overrunning clutch 7 and the stirring shaft 2 are engaged. In the overrunning state where torque is not transmitted, the second overrunning clutch 8 and the mounting base 4 are in the torque-transmitting engagement state. When the stirring shaft 2 reverses, the second blade 6 and the first blade 5 are stationary relative to the stirring shaft 2. The first pin 901 moves back and forth up and down in the first sine groove 201, thereby driving the first slip ring 9 to move back and forth up and down on the stirring shaft 2 and the second blade 6, scraping off the lime slurry adhering to the stirring shaft 2 and the second blade 6. During the up and down movement, the first slip ring 9 moves horizontally back and forth by pushing and pulling the scraper 10 through the connecting rod 11 to scrape off the lime slurry adhering to the first blade 5. This utility model realizes automatic switching between "stirring-self-cleaning" dual modes through forward and reverse rotation switching. The mixer does not need to be stopped for manual cleaning, effectively reducing downtime and improving production efficiency.

[0028] In a specific example, the first overrunning clutch 7 includes a first internal gear ratchet 701, a first pawl 702, and a first mounting plate 703. The first mounting plate 703 is horizontally fixed on the stirring shaft 2, that is, the bottom end of the stirring shaft 2 is fixedly connected to the first mounting plate 703. The first internal gear ratchet 701 is rotatably sleeved on the periphery of the first mounting plate 703. The first blade 5 is fixedly connected to the outer peripheral wall of the first internal gear ratchet 701. The bottom end of the second blade 6 is fixedly connected to the upper end face of the first internal gear ratchet 701. The first pawl 702 is rotatably mounted on the first mounting plate 703. 3. The end of the first pawl 702 corresponds to the internal teeth of the first internal ratchet 701. A first spring 704 is provided on the first pawl 702. The first spring 704 is used to press the free end of the first pawl 702 against the tooth surface of the first internal ratchet 701. When the stirring shaft 2 rotates forward, the first pawl 702 on the first mounting plate 703 engages with the internal teeth of the first internal ratchet 701 to achieve a torque transmission engagement state. The interface synchronously drives the first internal ratchet 701 to rotate, thereby driving the first blade 5 and the second blade 6 to rotate and stir.

[0029] In a specific example, the second overrunning clutch 8 includes a second internal gear ratchet 801, a second pawl 802, and a second mounting plate 803. The second mounting plate 803 is rotatably mounted on the stirring shaft 2. The second internal gear ratchet 801 is fixedly mounted on the bottom end of the mounting base 4. The top end of the second blade 6 is connected to the bottom surface of the second mounting plate 803. The second pawl 802 is rotatably mounted on the second mounting plate 803, and the end of the second pawl 802 corresponds to the internal teeth of the second internal gear ratchet 801. A second spring 804 is provided on the second pawl 802, which is used to press the free end of the second pawl 802 against the tooth surface of the second internal gear ratchet 801. When the stirring shaft 2 reverses, the second pawl 802 engages with the internal teeth of the second internal ratchet 801. At this time, since the mounting base 4 is fixed, the second internal ratchet 801 and the second mounting plate 803 are in a torque-transmitting meshing state and are also fixed. At the same time, since the first overrunning clutch 7 is in an overrunning state that does not transmit torque, the reverse rotation power of the stirring shaft 2 cannot be transmitted to the first blade 5 and the second blade 6. The first blade 5 and the second blade 6 are also in a relatively stationary state. The stirring shaft 2 drives the first slip ring 9 to slide up and down along the second blade 6 (the second blade 6 acts as a guide rail for the first slip ring 9 to slide up and down) and the stirring shaft 2 through the first pin 901.

[0030] In a preferred embodiment, a second sinusoidal groove 202 is provided on the outer wall of the upper section of the stirring shaft 2. The two ends of the second sinusoidal groove 202 intersect to form a closed oblique annular groove. A second slip ring 12 is movably sleeved on the outer wall of the stirring shaft 2. A second pin 121 is horizontally provided on the inner wall of the second slip ring 12. One end of the second pin 121 extends into the second sinusoidal groove 202. The middle part of the second blade 6 passes through the second slip ring 12. Due to the limitation of the connecting rod 11, the range of the first slip ring 9's up-and-down reciprocating movement on the stirring shaft 2 is limited, and it cannot scrape off the sticky material on the upper part of the stirring shaft 2 and the second blade 6. By independently setting the second slip ring 12 for scraping, the scraping effect of the sticky material is further improved.

[0031] In a preferred embodiment, rollers 902 are provided on both the first pin 901 and the second pin 121. The wheel surfaces of the rollers 902 respectively mate with the groove surfaces of the corresponding first sine grooves 201 and second sine grooves 202. By using the rollers 902, the sliding friction between the first pin 901 and the second pin 121 and the first sine grooves 201 and second sine grooves 202 is changed to rolling friction, reducing the friction force during movement and making the movement of the first slip ring 9 and the second slip ring 12 smoother.

[0032] In a preferred embodiment, the groove depth of the first sinusoidal groove 201 and the second sinusoidal groove 202 is 1.2-1.5 times the diameter of the first pin 901 and the second pin 121, and the groove width of the first sinusoidal groove 201 and the second sinusoidal groove 202 is slightly larger than the outer diameter of the roller 902, to ensure that the roller 902 can still roll normally when the calcium carbonate slurry crystallizes and adheres, and to avoid the roller 902 being lifted off the groove due to the groove depth being too shallow.

[0033] In a preferred embodiment, a mounting crossbar 13 is fixedly provided at the bottom of the mounting base 4. When the mixer of this utility model is used in the digestion tank, it is erected across the digestion tank by the mounting crossbar 13, so that the mixer can be installed in the middle of the digestion tank.

[0034] The above description, in conjunction with specific / preferred embodiments, provides a further detailed explanation of the present invention and should not be construed as limiting the specific implementation of the present invention to these descriptions. For those skilled in the art, various substitutions or modifications can be made to these described embodiments without departing from the concept of the present invention, and all such substitutions or modifications should be considered within the protection scope of the present invention. In the description of this specification, the reference to terms such as "an embodiment," "some embodiments," "preferred embodiment," "example," "specific example," or "some examples," etc., indicates that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the described specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples. Without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification and the features of different embodiments or examples. Although embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations may be made herein without departing from the scope of protection of the patent application.

Claims

1. A mixer for calcium carbonate production, comprising a drive motor, a stirring shaft, a gearbox, and a mounting base, wherein the conveying end of the drive motor is connected to the input end of the gearbox, the output end of the gearbox is connected to one end of the stirring shaft, and both the drive motor and the gearbox are mounted on the mounting base, characterized in that: The stirring shaft is provided with a first blade and a second blade. The bottom ends of the first blade and the second blade are connected to the bottom end of the stirring shaft through a first overrunning clutch. The top end of the second blade is connected to the bottom of the mounting base through a second overrunning clutch. The outer wall of the lower section of the stirring shaft is provided with a first sine groove. The first sine groove intersects at both ends to form a closed oblique annular groove. A first slip ring is movably sleeved on the outer wall of the stirring shaft. The middle part of the second blade passes through the first slip ring. A first pin is horizontally provided on the inner wall of the first slip ring. One end of the first pin extends into the first sine groove. A scraper is movably sleeved on the first blade. A connecting rod is connected between the scraper and the first slip ring. The two ends of the connecting rod are respectively hinged to the scraper and the first slip ring.

2. The mixer for calcium carbonate production as described in claim 1, characterized in that: Both the first blade and the second blade are straight plates. The first blade is perpendicularly connected to the stirring shaft, and the second blade surrounds the stirring shaft and is parallel to the stirring shaft.

3. The mixer for calcium carbonate production as described in claim 2, characterized in that: The first overrunning clutch includes a first internal gear ratchet, a first pawl, and a first mounting plate. The first mounting plate is fixed on the stirring shaft. The first internal gear ratchet is rotatably sleeved on the periphery of the first mounting plate. The first blade is connected to the outer peripheral wall of the first internal gear ratchet. The bottom end of the second blade is connected to the upper end of the first internal gear ratchet. The first pawl is rotatably mounted on the first mounting plate and is provided with a first spring.

4. The mixer for calcium carbonate production as described in claim 3, characterized in that: The second overrunning clutch includes a second internal gear ratchet, a second pawl, and a second mounting plate. The second mounting plate is rotatably mounted on the stirring shaft. The second internal gear ratchet is fixed at the bottom end of the mounting base. The top end of the second blade is connected to the bottom surface of the second mounting plate. The second pawl is rotatably mounted on the second mounting plate and has a second spring.

5. The mixer for calcium carbonate production as described in claim 4, characterized in that: The upper section of the stirring shaft is provided with a second sinusoidal groove on its outer wall. The two ends of the second sinusoidal groove intersect to form a closed oblique annular groove. A second slip ring is movably sleeved on the outer wall of the stirring shaft. A second pin is horizontally provided on the inner wall of the second slip ring. One end of the second pin extends into the second sinusoidal groove. The middle part of the second blade passes through the second slip ring.

6. The mixer for calcium carbonate production as described in claim 5, characterized in that: Both the first pin and the second pin are equipped with rollers, and the wheel surfaces of the rollers respectively mate with the groove surfaces of the corresponding first sine groove and the second sine groove.

7. The mixer for calcium carbonate production as described in claim 6, characterized in that: The groove depth of the first sine groove and the second sine groove is 1.2-1.5 times the diameter of the first pin and the second pin, and the groove width of the first sine groove and the second sine groove is slightly larger than the outer diameter of the roller.

8. The mixer for calcium carbonate production as described in claim 7, characterized in that: The scraper block is provided with a first through hole for the first blade to pass through, and the first slip ring and the second slip ring are both provided with a second through hole for the second blade to pass through.

9. The mixer for calcium carbonate production as described in claim 8, characterized in that: The top surface of the scraper is provided with a first mounting ear, and the outer peripheral wall of the first slip ring is provided with a second mounting ear. The two ends of the connecting rod are respectively hinged to the first mounting ear and the second mounting ear.

10. The mixer for calcium carbonate production as described in any one of claims 1 to 9, characterized in that: A mounting crossbar is fixedly provided at the bottom of the mounting base.

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