A screening device for food-grade heavy calcium carbonate raw materials

Abstract

This utility model discloses a screening device for food-grade heavy calcium carbonate raw materials, relating to the field of heavy calcium carbonate production technology. The utility model includes a screening machine with an anti-clogging mechanism at its upper part for grinding calcium carbonate powder that agglomerates during screening. The anti-clogging mechanism includes a grinding and pressing assembly comprising a fixed ring fixedly installed on the upper part of the screening machine. When the drive motor rotates the active rod, the driven rod, in conjunction with the limiting ring, performs a circular motion, causing the grinding disc to rotate synchronously. Simultaneously, driven by a servo motor, the grinding disc rotates on its own axis, resulting in a composite motion trajectory of revolution and rotation. This quickly grinds spherical agglomerates of heavy calcium carbonate powder that have formed during screening due to vibration into loose particles. Compared to single vibrating screening, this effectively avoids screen clogging, reduces downtime for cleaning, and significantly improves continuous production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of heavy calcium carbonate production technology, specifically to a screening device for food-grade heavy calcium carbonate raw materials. Background Technology

[0002] Food-grade heavy calcium carbonate is a powdered inorganic compound made from natural calcium carbonate minerals (such as calcite and limestone) through physical crushing, grinding, and sieving processes. Its main component is CaCO3. In the production process of food-grade heavy calcium carbonate, sieving is a key step in removing impurities and controlling particle size distribution.

[0003] Referring to the patent document: Patent Publication No. CN208482785U, Patent Publication Date 2019-02-12, a vibrating screen device for food-grade light calcium carbonate raw materials is disclosed. The device includes a vibrating machine body, with a fixed block inside the vibrating machine body. Fixed support plates are installed at both ends of the vibrating machine body and at the right end of the fixed block. A connecting hinge is connected to the upper end of the fixed support plate, and a fixed pressure plate is fixedly connected to the lower end of the connecting hinge. A receiving tray is installed at the lower end of the second layer of vibrating screens, and a guide groove is connected to the outside of the receiving tray. A flat plate is fixedly connected to the outside of the guide groove, and a fixed groove is provided inside the lower end of the flat plate. A support plate is connected inside the fixed groove. This vibrating screen device for food-grade light calcium carbonate raw materials has two layers of vibrating screens, which can make the screening of light calcium carbonate raw materials more uniform. Furthermore, the vibrating screens in this device are fixed inside the vibrating machine body by fixing bolts, improving the stability of the vibrating screens.

[0004] Based on the search of patent numbers and the shortcomings of existing technologies, the following was found: Traditional disc screening equipment often encounters agglomeration problems when processing heavy calcium carbonate powder due to the powder's hygroscopicity, electrostatic effects, or vibration. These agglomerated spherical particles are often much larger than the screen aperture specifications. Once they accumulate on the screen surface, they quickly clog the screen apertures, preventing the material from passing through smoothly and reducing screening efficiency. In order to maintain the normal operation of the screening equipment, operators have to frequently stop the machine to clean the screen discs. This frequent downtime not only affects the efficiency of continuous production and disrupts the production rhythm, but also significantly increases labor maintenance costs.

[0005] Therefore, this utility model provides a screening device for food-grade heavy calcium carbonate raw materials. Utility Model Content

[0006] To address the problem that traditional disc screening equipment easily agglomerates into spherical particles far exceeding the screen aperture size when processing heavy calcium carbonate powder, which quickly clogs the screen apertures and prevents the material from passing through the screen, thus reducing screening efficiency, the purpose of this utility model is to provide a food-grade heavy calcium carbonate raw material screening device.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a food-grade heavy calcium carbonate raw material screening device, comprising a screening machine, wherein the upper part of the screening machine is provided with an anti-blocking mechanism for grinding the calcium carbonate powder agglomerated during screening, the anti-blocking mechanism comprising: The grinding and pressing assembly includes a fixed ring fixedly installed on the upper part of the screening machine. Three evenly distributed support columns are fixedly installed on the top of the fixed ring. A drive assembly is provided at the bottom of one of the support columns. A drive rod is rotatably installed on the top of each of the three support columns. A driven rod is rotatably installed on one side of the top of each of the three drive rods. A screening disc is detachably installed on the upper part of the screening machine. A limit ring is provided on the top of the screening disc. One side of each of the three driven rods is fixedly installed on the outside of the limit ring. A lifting frame is slidably locked in the middle of the limit ring. A grinding disc is rotatably installed on the lower part of the lifting frame. A servo motor is provided in the middle of the lifting frame. The top middle of the grinding disc is fixedly installed on the drive end of the servo motor. An adjustment component, located above the limit ring, is used to adjust the height of the grinding disc.

[0008] Preferably, the adjustment assembly includes a lifting cylinder disposed on the upper part of the lifting frame, and the top center of the lifting frame is fixedly installed on the drive end of the lifting cylinder.

[0009] Preferably, the drive assembly includes a drive motor fixedly mounted on the bottom end of one side of the fixed ring, and one bottom end of one side of the drive rod is fixedly mounted on the drive end of the drive motor.

[0010] Preferably, the upper part of the lifting frame has a cavity, and the servo motor is fixedly installed in the middle of the cavity.

[0011] Preferably, the lower surface of the grinding disc has radially arranged grinding grooves evenly distributed, and the grinding disc has a disc-shaped structure.

[0012] Preferably, a support frame is installed at the top of the limiting ring, and the lifting cylinder is fixedly installed at the middle of the top of the support frame.

[0013] Beneficial effects

[0014] This invention provides a screening device for food-grade heavy calcium carbonate raw materials. Compared with the prior art, it has the following advantages: 1. When the drive motor drives the active rod to rotate, the driven rod and the limiting ring move in a circular motion, causing the grinding disc to move in a circular motion synchronously. At the same time, the grinding disc rotates under the drive of the servo motor, thus forming a composite motion trajectory of revolution and rotation of the grinding disc. This can quickly grind the spherical agglomerates of heavy calcium carbonate powder that have formed during screening due to vibration into loose particles. Compared with single vibrating screening, it can effectively avoid screen blockage, reduce the frequency of downtime for cleaning, and significantly improve continuous production efficiency.

[0015] 2. This application uses a lifting cylinder to drive the lifting frame to move the grinding disc vertically, which can adjust the distance between the grinding disc and the screening disc. When the powder agglomerates severely, the height of the grinding disc is reduced to increase the grinding pressure. When the powder particle size is small, the grinding disc is raised to avoid over-grinding. At the same time, it avoids excessive grinding of normal powder or wear of the screening disc due to too small a distance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the anti-blocking mechanism of this utility model.

[0018] Figure 3 This is a schematic diagram of the cross-sectional structure of the lifting frame of this utility model.

[0019] Figure 4 This is a schematic diagram of the grinding disc structure of this utility model.

[0020] In the diagram: 1. Screening machine; 11. Screening disc; 12. Fixed ring; 2. Anti-blocking mechanism; 21. Grinding assembly; 211. Support column; 212. Drive motor; 213. Driving rod; 214. Driven rod; 215. Limit ring; 216. Lifting frame; 217. Servo motor; 2171. Cavity; 218. Grinding disc; 22. Adjustment assembly; 221. Support frame; 222. Lifting cylinder. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-4This utility model provides a technical solution: a screening device for food-grade heavy calcium carbonate raw materials, including a screening machine 1, and an anti-blocking mechanism 2 provided on the upper part of the screening machine 1, used to grind the calcium carbonate powder that agglomerates during screening by the screening machine 1. The anti-blocking mechanism 2 includes: The grinding and pressing assembly 21 includes a fixed ring 12 fixedly installed on the upper part of the screening machine 1. Three evenly distributed support columns 211 are fixedly installed on the top of the fixed ring 12. The three support columns 211 are evenly distributed at 120° with the center of the fixed ring 12 as the center, forming a stable triangular support structure. A drive assembly is provided at the bottom of one of the support columns 211. A drive rod 213 is rotatably installed on the top of each of the three support columns 211. The drive rod 213 can rotate freely around the rotation axis at the top of the support column 211. A driven rod 214 is rotatably installed on one side of the top of each of the three drive rods 213. The driven rod 214 is connected to the drive rod 213 through a rotation axis and can swing under the drive of the drive rod 213. The upper part of the screening machine 1 is detachably equipped with a screening disc 11. The top of the screening disc 11 is provided with a limiting ring 215. One side of each of the three driven rods 214 is fixedly installed on the outside of the limiting ring 215. The middle of the limiting ring 215 is slidably fitted with a lifting frame 216, so that the lifting frame 216 can slide vertically in the middle of the limiting ring 215. The lower part of the lifting frame 216 is rotatably mounted with a grinding disc 218. The middle of the lifting frame 216 is provided with a servo motor 217. The top middle of the grinding disc 218 is fixedly installed on the drive end of the servo motor 217. The servo motor 217 can be an MS1-R series explosion-proof servo motor. Driven by the servo motor 217, the grinding disc 218 can rotate. Adjustment component 22 is located on the upper part of limit ring 215 and is used to adjust the height of grinding disc 218.

[0023] The adjustment component 22 includes a lifting cylinder 222 disposed on the upper part of the lifting frame 216. The driving end of the lifting cylinder 222 is fixedly installed at the top center of the lifting frame 216. The lifting cylinder 222 can be a Joda dust removal lifting cylinder SC type aluminum alloy cylinder. It is also connected to the control system of the screening machine 1 to control the start and stop of the lifting cylinder 222. The lifting cylinder 222 can drive the lifting frame 216 to move up and down through the extension and retraction of the driving end, that is, drive the grinding disc 218 to move up and down, so as to adjust the distance between the grinding disc 218 and the screening disc 11, so as to ensure normal screening while grinding the agglomerated powder.

[0024] The drive assembly includes a drive motor 212 fixedly mounted on one side of the bottom of the fixed ring 12. One side of the bottom of the drive rod 213 is fixedly mounted on the drive end of the drive motor 212. The drive motor 212 can be a three-phase asynchronous motor of model ZDY122. When the drive motor 212 is working, it can drive the drive rod 213 to rotate. Since the three drive rods 213 are connected to the limiting ring 215 through the driven rod 214, when one drive rod 213 rotates, it will drive the other two drive rods 213 to rotate synchronously through the driven rod 214, so that the limiting ring 215 moves in a circle along the screening disc 11.

[0025] The upper part of the lifting frame 216 has a cavity 2171, and the servo motor 217 is fixedly installed in the middle of the cavity 2171. The cavity 2171 provides installation space for the servo motor 217 and also protects the servo motor 217.

[0026] The lower surface of the grinding disc 218 is uniformly distributed with radially arranged grinding grooves, and the grinding disc 218 has a disc-shaped structure. The radial grinding grooves can increase the contact area between the grinding disc 218 and the agglomerated powder, thereby improving the grinding efficiency. At the same time, the diameter of the grinding disc 218 is the same as the radius of the screening disc 11.

[0027] A support frame 221 is installed at the top of the limiting ring 215. The lifting cylinder 222 is fixedly installed at the middle of the top of the support frame 221. The support frame 221 provides an installation base for the lifting cylinder 222, ensuring the stable installation and operation of the lifting cylinder 222.

[0028] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0029] During operation, heavy calcium carbonate powder is placed into the screening disc 11. The screening machine 1 is started to drive the screening disc 11 to generate high-frequency vibration to screen and filter the heavy calcium carbonate powder. However, since the heavy calcium carbonate powder is prone to agglomerate into spherical shape during vibration, the drive motor 212 is started to output power to drive the connected active rod 213 to rotate during the screening process. When the active rod 213 rotates, it is linked by the driven rod 214 to drive the limit ring 215 to make a circular motion along the screening disc 11. At the same time, under the drive of the servo motor 217, the grinding disc 218 can be driven to rotate, so that the grinding disc 218 makes a circular and rotational motion on the upper part of the screening disc 11 to mechanically grind the agglomerated heavy calcium carbonate powder. At the same time, based on the grinding and sieving effect, the lifting cylinder 222 of the adjusting component 22 is activated, which drives the lifting frame 216 to move up and down, that is, drives the grinding disc 218 to move up and down, so as to adjust the distance between the grinding disc 218 and the sieving disc 11, ensuring normal sieving while grinding the agglomerated powder.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A food grade heavy calcium carbonate raw material screening device, comprising a screening machine (1), characterized in that: The upper part of the screening machine (1) is provided with an anti-blocking mechanism (2) for grinding the calcium carbonate powder that agglomerates during screening by the screening machine (1). The anti-blocking mechanism (2) includes: The grinding and pressing assembly (21) includes a fixed ring (12) fixedly installed on the upper part of the screening machine (1). Three evenly distributed support columns (211) are fixedly installed on the top of the fixed ring (12). A drive assembly is provided at the bottom of one of the support columns (211). A drive rod (213) is rotatably installed on the top of each of the three support columns (211). A driven rod (214) is rotatably installed on one side of the top of each of the three drive rods (213). A screening assembly is detachably installed on the upper part of the screening machine (1). The screen (11) has a limiting ring (215) at the top. One side of each of the three driven rods (214) is fixedly installed on the outside of the limiting ring (215). The middle of the limiting ring (215) is slidably fitted with a lifting frame (216). The lower part of the lifting frame (216) is rotatably fitted with a grinding disc (218). The middle part of the lifting frame (216) is fitted with a servo motor (217). The top middle part of the grinding disc (218) is fixedly installed on the drive end of the servo motor (217). An adjustment component (22) is located on the upper part of the limiting ring (215) and is used to adjust the height of the grinding disc (218).

2. A food grade ground calcium carbonate raw material screening device according to claim 1, characterized in that: The adjustment component (22) includes a lifting cylinder (222) disposed on the upper part of the lifting frame (216), and the top center of the lifting frame (216) is fixedly installed on the driving end of the lifting cylinder (222).

3. A food grade ground calcium carbonate raw material screening device as claimed in claim 1, wherein: The drive assembly includes a drive motor (212) fixedly mounted on the bottom of one side of the fixed ring (12), and one of the drive rods (213) is fixedly mounted on the drive end of the drive motor (212) on one side of the bottom.

4. A food grade ground calcium carbonate raw material screening device as claimed in claim 1, wherein: The upper part of the lifting frame (216) has a cavity (2171), and the servo motor (217) is fixedly installed in the middle of the cavity (2171).

5. A food grade ground calcium carbonate raw material screening device as claimed in claim 1, wherein: The lower surface of the grinding disc (218) is uniformly distributed with radially arranged grinding grooves, and the grinding disc (218) has a disc-shaped structure.

6. A food grade ground calcium carbonate raw material screening device as claimed in claim 2, wherein: The top of the limiting ring (215) is equipped with a support frame (221), and the lifting cylinder (222) is fixedly installed at the middle of the top of the support frame (221).

Images