Granulating device beneficial to forming fluffy powder particles

Abstract

The utility model relates to the technical field of ceramic production, in particular to a granulation device beneficial to formation of fluffy powder particles. Comprising a first extrusion roller and a second extrusion roller which rotate oppositely, a roller gap is formed between the first extrusion roller and the second extrusion roller, and at least one of the first extrusion roller and the second extrusion roller is in a circular truncated cone shape; at least one of the first extrusion roller and the second extrusion roller is arranged to be in a circular truncated cone shape, during granulation, the linear speeds of the contact parts of each ceramic pug and the first extrusion roller and the contact parts of each ceramic pug and the second extrusion roller are different, and the speed difference exists, so that each ceramic pug is rubbed into pieces in the granulation process; the interior of the prepared powder particles is bulky, and little fine powder is generated in the process of preparing the ceramic powder particles, so that the surface quality of a green brick prepared from the ceramic powder particles subsequently can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of ceramic production, in particular to a granulating device which is conducive to forming fluffy powder particles. Background Art

[0002] At present, the ceramic powders used by ceramic enterprises to produce ceramic tiles are generally divided into the following two categories:

[0003] One type is hollow ceramic powder particles, which are produced by a wet powder making process, which is also called spray drying powder making in the industry.

[0004] The other type is solid ceramic powder, which is obtained by dry powder making or integrated powder making process.

[0005] The following table compares the morphology of the powders obtained in the above two types of powder making processes:

[0006] Wet milling Dry milling Powder form Hollow, nearly spherical Solid, dense and less regular

[0007] It can be seen from the above table that compared with the smooth and regular spherical hollow powder after spray granulation of wet pulverizing, the solid powder obtained by dry pulverizing and integrated pulverizing has an irregular and rough surface, poor sphericity, and the particles are solid and have higher strength.

[0008] The hollow powder obtained by wet pulverization has a smooth surface, good fluidity, and small friction between particles. When a certain pressure is applied to the blank, the hollow powder begins to move in the direction of the force, and the gas between the powders is displaced and squeezed out. As the pressure increases, the powder particles shrink evenly to form a tight stack, and the surface of the blank is smooth and flat. The solid powder particles obtained by dry pulverization have an uneven and angular surface, irregular particles, poor fluidity, and when making bricks, the solid, hardened and dense powder particles will not shrink after the molding machine applies pressure. Therefore, small pits and protrusions will form on the surface of the bricks, with high roughness, and the surface of the blank is easily not smooth or flat.

[0009] The reason why dry powder making causes ceramic powder to be hardened and dense is that the roller presses currently used by ceramic powder manufacturers for ceramic granulation (also called ceramic powder making) for dry powder making are all double-roller presses, which squeeze and crush the ceramic raw materials through the two extrusion rollers in the chassis rotating towards each other during operation, thereby preparing ceramic powder of corresponding particle size. Compared with spray granulation equipment and its corresponding granulation method (spray granulation method), double-roller presses and their corresponding granulation method (roller granulation method) have the advantages of low energy consumption and high efficiency. However, the existing roller granulation method also has obvious technical defects: mainly, the two extrusion rollers rotate towards each other during the granulation process, and the ceramic mud is only subjected to the extrusion force in the horizontal direction (lateral direction), that is, the ceramic mud is crushed, resulting in the ceramic particles prepared being pressed too dense and hardened.

[0010] Therefore, improving the existing dry powder making process to obtain fluffy ceramic powder particles plays an important role in the subsequent production of high-quality ceramic tiles. Summary of the invention

[0011] The present invention provides a granulating device which is conducive to forming fluffy powder particles in order to solve the problem that the ceramic powder particles are too dense and hardened when the ceramic powder particles are produced by a double-roll roller press.

[0012] In order to achieve the above functions, the technical solution provided by the present invention is:

[0013] A granulating device that is conducive to forming fluffy powder particles includes a first extrusion roller and a second extrusion roller that rotate in opposite directions, a roller gap is formed between the first extrusion roller and the second extrusion roller, and at least one of the first extrusion roller and the second extrusion roller is in a truncated cone shape.

[0014] Preferably, the first squeezing roller and the second squeezing roller have different rotation speeds.

[0015] Preferably, the first squeezing roller and the second squeezing roller are both truncated cone-shaped.

[0016] Preferably, a heating device is provided inside the first squeezing roller and the second squeezing roller for heating the roller surfaces of the first squeezing roller and the second squeezing roller.

[0017] Preferably, the roll gap is 0.5-5 mm.

[0018] The beneficial effect of the present invention is that by setting at least one of the first extrusion roller and the second extrusion roller into a truncated cone shape, during granulation, the linear speed of the contact part between each ceramic clay and the first extrusion roller and the second extrusion roller is different, and there is a speed difference. Therefore, during the granulation process, each ceramic clay is crushed, and the interior of the prepared powder particles is relatively fluffy, and less fine powder is generated in the process of preparing the ceramic powder particles, which is beneficial to improving the surface quality of the bricks subsequently made using the ceramic powder particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of embodiment 1;

[0020] Figure 2 It is a schematic diagram of the cooperation of two squeezing rollers in the second embodiment;

[0021] Figure 3 Schematic diagram of the cross section of the squeeze roller. DETAILED DESCRIPTION

[0022] The following is combined with Figure 1 To Attachment Figure 3 The present invention is further described:

[0023] Embodiment 1:

[0024] like Figure 1 The granulating device shown is conducive to forming fluffy powder particles, including a machine box 1 and two squeezing rollers arranged in the machine box 1, namely a first squeezing roller 2 and a second squeezing roller 3. A roller gap is formed between the first squeezing roller 2 and the second squeezing roller 3. The first squeezing roller 2 is cylindrical as a whole, and the second squeezing roller 3 is truncated cone-shaped.

[0025] The two ends of the roller shafts of the first extrusion roller 2 and the second extrusion roller 3 are respectively connected to two groups of bearing assemblies (a first group of bearing assemblies 2b and a second group of bearing assemblies 3b) symmetrically arranged on the left side plate 101 and the right side plate 102 of the chassis 1. One end of the roller shafts of the first extrusion roller 2 and the second extrusion roller 3 extends out of the left side plate 101 of the chassis and is connected to the respective drive motors (a first drive motor 2a and a second drive motor 2b). The first group of bearing assemblies 2b and the second group of bearing assemblies 3b are both installed on the left side plate 101 and the right side plate 102 of the chassis 1 in a manner that they can move forward and backward. By moving the first group of bearing assemblies 2b and the second group of bearing assemblies 3b forward and backward, the distance between the first extrusion roller 2 and the second extrusion roller 3 can be adjusted, thereby adjusting the roller gap.

[0026] The roller gap is generally 0.5 to 5 mm. The purpose of setting the roller gap adjustable is: when in use, the granulating device of the utility model generally adopts a plurality of granulating devices in series, that is, the maximum roller gap of the first granulating device is 5 mm, and the roller gap of the subsequent granulating devices gradually becomes smaller, so that the particle size of the ceramic mud material gradually becomes smaller during the granulation process to increase the granulation speed.

[0027] By setting at least one of the first extrusion roller 2 and the second extrusion roller 3 into a truncated cone shape, during granulation, the linear speeds of the contact parts of each ceramic clay particle with the first extrusion roller 2 and the second extrusion roller 3 are different, and there is a speed difference. Therefore, during the granulation process, each ceramic clay particle is crushed, the interior of the prepared powder particles is relatively fluffy, and less fine powder is generated in the process of preparing the ceramic powder particles, which is beneficial to improving the surface quality of the bricks subsequently made using the ceramic powder particles.

[0028] In order to further increase the speed difference between each ceramic clay and the contact part between the first squeeze roller 2 and the second squeeze roller 3, the first squeeze roller 2 and the second squeeze roller 3 have different rotation speeds, that is, different angular velocities. In this embodiment, the rotation speed of the first squeeze roller 2 is twice that of the second squeeze roller 3.

[0029] Embodiment 2:

[0030] The difference between this embodiment and the first embodiment is that the first squeezing roller 2 and the second squeezing roller 3 are both truncated cone-shaped. Figure 2 As shown, the large and small heads of the two truncated cone-shaped squeezing rollers are arranged correspondingly, thereby forming roller gaps with the same gap.

[0031] Since the water content of the ceramic mud used for granulation is about 7% and it has a little stickiness, in order to prevent the ceramic powder from adhering to the roller surfaces of the first extrusion roller 2 and the second extrusion roller 3 during the granulation process. Figure 3 As shown, the utility model is provided with a heating device 4 inside the first extrusion roller 2 and the second extrusion roller 3, which is used to heat the roller surfaces of the first extrusion roller 2 and the second extrusion roller 3. By heating the roller surface by the heating device 4, the ceramic powder adhering to the roller surface can lose its stickiness after drying, and fall off from the roller surface during the working process.

[0032] In this embodiment, the heating device 4 is an electric heating sheet, which is evenly arranged on the inner surface of the squeeze roller. Of course, according to actual conditions, the heating device 4 can also be implemented by other technical means such as an electric heating rod or by setting a closed chamber on the inner side of the roller surface of the squeeze roller and passing a high temperature liquid into the closed chamber.

[0033] The above-described embodiments are only preferred examples of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structures, features and principles described in the scope of the patent application of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A granulating device that is conducive to forming fluffy powder particles, comprising a first extrusion roller and a second extrusion roller that rotate in opposite directions, wherein a roller gap is formed between the first extrusion roller and the second extrusion roller, and characterized in that: At least one of the first squeezing roller and the second squeezing roller is in a truncated cone shape.

2. The granulating device for forming fluffy powder particles as claimed in claim 1, characterized in that: The first squeezing roller and the second squeezing roller have different rotation speeds.

3. The granulating device for forming fluffy powder particles as claimed in claim 1 or 2, characterized in that: The first squeezing roller and the second squeezing roller are both truncated cone-shaped.

4. The granulating device for forming fluffy powder particles as claimed in claim 3, characterized in that: A heating device is disposed inside the first extrusion roller and the second extrusion roller, and is used to heat the roller surfaces of the first extrusion roller and the second extrusion roller.

5. The granulating device for forming fluffy powder particles as claimed in claim 4, characterized in that: The roll gap is 0.5 to 5 mm.

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