Aluminum hydroxide powder grinding apparatus

Abstract

The application relates to an aluminum hydroxide grinding technical field, in particular to an aluminum hydroxide powder grinding equipment, which comprises a machine shell, a rotor assembly and a grinding sleeve. The rotor assembly comprises a rotor body, the outer circumferential surface of the rotor body is provided with uniformly distributed grinding sections, the rotor body is composed of a plurality of rotors with gradually increased outer diameters, connecting sections are connected between the rotors with gradually increased outer diameters, a ring of guide holes and a limiting assembly are arranged on the inner wall of the machine shell, the guide holes and the limiting assembly are alternately and uniformly distributed, a ring of guide holes is arranged on the outer side of the middle part of the grinding sleeve, and the limiting assembly and the top end of the guide rod abut against the inner part respectively. Through cooperation of the rotor assembly and the grinding sleeve, the shapes of the two are matched, a gradually changing grinding gap which gradually decreases from top to bottom is formed, the gap is smaller and smaller downwards, the aluminum hydroxide slurry is gradually refined and ground in the falling process, the effect of grading grinding is achieved, the uniformity of the powder after grinding is effectively improved, and the fine grinding requirement is met.

Description

Technical Field

[0001] This invention relates to the field of aluminum hydroxide grinding technology, specifically to an aluminum hydroxide powder grinding device. Background Technology

[0002] Aluminum hydroxide has become one of the most widely used new flame retardants on the market due to its excellent low-temperature decomposition and smoke suppression capabilities, as well as its low price and non-toxicity. As a flame retardant, aluminum hydroxide usually needs to be crushed and ground to a certain particle size in order to produce effective flame retardant ability. Therefore, it is necessary to use a special grinding device to refine the aluminum hydroxide powder to meet the application requirements.

[0003] The rotor and grinding sleeve of existing aluminum hydroxide powder grinding equipment have a fixed or single gap structure, which cannot form a gradual grinding gap. It is difficult to achieve progressive fine grinding of slurry, resulting in uneven powder particle size distribution, low grinding accuracy and poor efficiency. The grinding sleeve is fixed and has no floating avoidance function. When grinding hard particles, the rotor and grinding sleeve are easily jammed, which damages the parts and affects the normal operation of the equipment. The discharge pipe has a simple straight-through structure and lacks an effective anti-clogging mechanism. The fine powder after grinding is easy to accumulate and clump, causing blockage of the discharge pipe. Summary of the Invention

[0004] The purpose of this invention is to provide an aluminum hydroxide powder grinding device in order to solve the above-mentioned problems.

[0005] The present invention achieves the above-mentioned objective through the following technical solution: an aluminum hydroxide powder grinding device, comprising a housing, a rotor assembly, and a grinding sleeve. The rotor assembly includes a rotor body, with uniformly distributed grinding sections on the outer circumferential surface of the rotor body. The rotor body is composed of several rotors with progressively increasing outer diameters, and connecting sections connect the several rotors with progressively increasing outer diameters. A limiting component and a guide rod are arranged around the middle of the inner wall of the housing, and the limiting component and the guide rod are alternately and evenly distributed. A guide hole is opened on the outer side of the middle of the grinding sleeve, and the top ends of the limiting component and the guide rod respectively abut against the inside of the guide hole. The limiting component includes a sleeve, and a connecting rod is slidably fitted inside the sleeve. A limiting seat is provided at one end of the annular seat, and an annular seat is provided at one end of the connecting rod. A first spring is sleeved at one end of the connecting rod.

[0006] Preferably, the grinding section extends circumferentially along the rotor body, and the outer circumferential surface of the grinding section is provided with a number of evenly distributed grinding teeth. The rotor body and the grinding section are integrally formed.

[0007] Preferably, the connecting section is arranged with a smaller top and a larger bottom, the top of the rotor body is connected to a driver through a transmission mechanism, the housing is fitted outside the rotor assembly, and the bottom surface of the housing is fixedly connected to a support leg.

[0008] Preferably, the housing is a cylindrical shape with openings at both the top and bottom, and a feed hopper is welded to the opening at the top of the housing. The housing is in contact with the grinding sleeve through a limiting component and a guide rod.

[0009] Preferably, the grinding sleeve is a stepped cylindrical shape with a larger upper diameter and a smaller lower diameter. The inner diameter of the grinding sleeve gradually decreases from top to bottom. The grinding sleeve surrounds the outside of the rotor assembly. The shape of the grinding sleeve matches the shape of the rotor assembly and is tightly fitted to the rotor assembly.

[0010] Preferably, the sleeve is a cylindrical shape with one end open, the diameter of the connecting rod matches the diameter of the sleeve opening, one end of the connecting rod extends to the outside of the sleeve, and one side of the annular seat abuts against the inner wall of the sleeve opening.

[0011] Preferably, the diameter of the annular seat is larger than the inner diameter of the sleeve opening, and the other side of the annular seat is abutted against one end of the first spring. The first spring is placed inside the sleeve and is located between the annular seat and the inner wall of the sleeve.

[0012] Preferably, the diameter of the limiting seat is larger than the opening width of the guide hole, a baffle is provided at the end of the guide rod near the guide hole, and the grinding sleeve is installed inside the machine housing by overlapping the guide hole and the limiting component.

[0013] Preferably, a discharge pipe is connected to the bottom opening of the housing, and four insertion holes are evenly opened on the inner wall of the discharge pipe. The cross-section of the insertion hole opening is convex. A second spring is placed on the inner wall of the insertion hole, and a push rod is inserted into the opening end of the insertion hole. A ball head section is fixedly connected to the top of the push rod.

[0014] Preferably, a retainer is provided at one end of the push rod inserted into the insertion hole, and the retainer is abutted against one end of the second spring. There are four push rods, which are arranged in a cross shape inside the discharge pipe, and there is a gap between the four push rods.

[0015] An aluminum hydroxide powder grinding device, using the above-mentioned apparatus, includes the following steps: The first step is to mix the aluminum hydroxide powder to be ground with an appropriate amount of grinding media to make a slurry, and pour it into the feed hopper at the top of the machine housing to ensure that the slurry can flow smoothly into the machine housing and grinding sleeve. The second step is to start the driver, which drives the rotor assembly to rotate at high speed through the transmission mechanism. The grinding section on the outer circumference of the rotor body rotates synchronously with the rotor. The grinding teeth on the grinding section cooperate with the grinding sleeve to grind the aluminum hydroxide slurry flowing into the gap. The gap between the rotor assembly and the grinding sleeve gets smaller as it goes down, and the grinding is finer, achieving the effect of graded grinding. The third step involves the grinding process, where several rotors with progressively increasing outer diameters grind the slurry step by step. At the same time, the grinding sleeve remains stable under the action of the limiting component and the guide rod. The connecting rod in the limiting component slides along the sleeve, and the first spring acts as a buffer and limiting force to prevent the grinding sleeve from shifting. The grinding sleeve automatically adapts to avoid hard particles according to the grinding situation. After the gap increases instantly and the hard block passes through, the spring resets and drives the grinding sleeve to re-adhere to the rotor assembly to prevent jamming. In the fourth step, the ground aluminum hydroxide slurry flows downward along the gap between the grinding sleeve and the rotor assembly under the pressure generated by the rotor rotation and enters the discharge pipe at the bottom of the machine casing. In the fifth step, when the slurry flows through the discharge pipe, it is discharged from the gap between the four push rods. When the ground powder is discharged, it impacts the ball head section of each push rod, causing the push rod to compress the second spring and slide along the insertion hole. The push rod is reset under the elastic action of the second spring. The push rod continues to vibrate under the elastic reset action of the second spring, which realizes the breaking of the powder arch and the prevention of blockage during discharge. It can play an auxiliary role in preventing blockage of the slurry during the discharge process.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By matching the rotor assembly and the grinding sleeve, the two are matched in shape to form a gradually decreasing grinding gap from top to bottom. The gap becomes smaller as it goes down, so that the aluminum hydroxide slurry can be gradually refined during the falling process, achieving the effect of graded grinding, effectively improving the uniformity of the powder after grinding, and meeting the requirements of fine grinding. 2. Through the cooperation of the grinding sleeve, the limiting component and the guide rod, the limiting component can apply an inward preload to the grinding sleeve, so that the grinding sleeve is tightly attached to the rotor assembly. When hard particles are encountered during grinding, the grinding sleeve can automatically adapt and avoid them, driving the connecting rod to slide along the sleeve and compress the first spring, so that the grinding gap increases instantaneously to allow the hard block to pass through. After the hard block passes through, the first spring resets and drives the grinding sleeve to re-attach to the rotor assembly, avoiding the device from jamming. It has a floating anti-jamming function to ensure the stable operation of the device. 3. Through the cooperation of the insertion hole, the second spring, the push rod, the ball head section and the clamp, the powder after grinding impacts the ball head section of each push rod when it is discharged, causing the push rod to compress the second spring and slide along the insertion hole. The push rod returns to its original position under the elastic action of the second spring, continuously generating vibration, which realizes the breaking of the powder arch and the prevention of blockage during discharge, effectively avoiding the accumulation and blockage of powder in the discharge pipe, and ensuring a smooth discharge process. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of powder grinding. Figure 2 This is a schematic diagram of the internal structure of powder grinding. Figure 3 This is a schematic diagram of the structure of the driver and rotor assembly; Figure 4This is a structural schematic diagram of the grinding sleeve, guide hole, limiting assembly, and guide rod. Figure 5 This is a schematic diagram of the limit component. Figure 6 This is a schematic diagram of the internal structure of the limiting component; Figure 7 This is a structural diagram of the discharge pipe, insertion hole, push rod, and ball head section; Figure 8 This is a schematic diagram of the internal structure of the discharge pipe, insertion hole, second spring, and clamp.

[0018] In the diagram: 1. Frame; 2. Support leg; 3. Housing; 4. Feed hopper; 5. Driver; 6. Rotor assembly; 601. Rotor body; 602. Connecting section; 603. Grinding section; 7. Grinding sleeve; 8. Guide hole; 9. Limiting assembly; 901. Sleeve; 902. Annular seat; 903. Limiting seat; 904. First spring; 905. Connecting rod; 10. Guide rod; 11. Discharge pipe; 12. Insertion hole; 13. Second spring; 14. Push rod; 15. Ball head section; 16. Card seat. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1 to 8 The present invention provides a technical solution: an aluminum hydroxide powder grinding device, comprising a housing 3, a rotor assembly 6, and a grinding sleeve 7. The rotor assembly 6 includes a rotor body 601, with uniformly distributed grinding sections 603 on the outer circumference of the rotor body 601. The rotor body 601 is composed of several rotors with progressively increasing outer diameters, and connecting sections 602 connect the several rotors with progressively increasing outer diameters. A ring of limiting components 9 and guide rods 10 is arranged around the middle of the inner wall of the housing 3, and the limiting components 9 and guide rods 10 are evenly distributed alternately. A ring of guide holes 8 is opened on the outer side of the middle of the grinding sleeve 7, and the top ends of the limiting components 9 and guide rods 10 respectively abut against the inside of the guide holes 8.

[0021] The grinding section 603 extends circumferentially along the rotor body 601. The outer circumferential surface of the grinding section 603 is provided with several evenly distributed grinding teeth. The grinding teeth are used to enhance the shearing effect during the grinding process and improve the grinding fineness of the aluminum hydroxide slurry. The rotor body 601 and the grinding section 603 are integrally formed structures, which can reduce the assembly gap and avoid particle residue caused by insufficient grinding.

[0022] The connecting section 602 has a structure that is smaller at the top and larger at the bottom. The top of the rotor body 601 is connected to a driver 5 via a transmission mechanism. The driver 5 is a motor, which provides rotational power to the rotor assembly 6, driving the rotor body 601 to rotate at high speed to achieve the grinding operation. The housing 3 is fitted over the rotor assembly 6. The bottom surface of the housing 3 is fixedly connected to a support leg 2, which supports the entire device and ensures the stability of the device during operation. The bottom end of the support leg 2 is welded to a frame 1, which includes a base plate and a bracket. The bracket is arranged in an inverted "L" shape, and the bottom surface of the short end of the "L" shaped bracket is connected to the top of the driver 5. The housing 3 is a cylindrical shape with openings at both the top and bottom. A feed hopper 4 is welded to the top opening of the housing 3. The feed hopper 4 is used to convey the aluminum hydroxide slurry to be ground into the device. The housing 3 is in contact with the grinding sleeve 7 through the limiting component 9 and the guide rod 10.

[0023] The grinding sleeve 7 is a stepped cylindrical shape with a larger upper diameter and a smaller lower diameter. The inner diameter of the grinding sleeve 7 gradually decreases from top to bottom. The grinding sleeve 7 surrounds the outside of the rotor assembly 6 and is tightly fitted to the rotor assembly 6. The change in the inner diameter of the grinding sleeve 7 matches the change in the outer diameter of the rotor body 601, forming a gradual grinding gap. At the same time, the grinding sleeve 7 can be adaptively adjusted with the limiting component 9 to avoid jamming with the rotor assembly 6.

[0024] The limiting component 9 includes a sleeve 901, a connecting rod 905 slidingly fitted inside the sleeve 901, a limiting seat 903 at one end of an annular seat 902, an annular seat 902 at one end of the connecting rod 905, and a first spring 904 sleeved on one end of the connecting rod 905. The sleeve 901 is a cylindrical shape with one open end. The diameter of the connecting rod 905 matches the diameter of the opening of the sleeve 901, ensuring that the connecting rod 905 can slide flexibly inside the sleeve 901. One end of the connecting rod 905 extends to the outside of the sleeve 901. One side of the annular seat 902 abuts against the inner sidewall of the opening of the sleeve 901, which can prevent the connecting rod 905 from falling out of the sleeve 901, realizing elastic buffering of the connecting rod 905 and providing elastic support for the adaptive adjustment of the grinding sleeve 7.

[0025] The diameter of the annular seat 902 is larger than the inner diameter of the opening of the sleeve 901, which can prevent the connecting rod 905 from falling out of the sleeve 901 and limit the grinding sleeve 7 to prevent the grinding sleeve 7 from shifting. The other side of the annular seat 902 is abutted against one end of the first spring 904. The first spring 904 is placed inside the sleeve 901 and is located between the annular seat 902 and the inner wall of the sleeve 901 to ensure the fit between the grinding sleeve 7 and the rotor assembly 6, thereby ensuring the stability of the grinding gap.

[0026] The diameter of the limiting seat 903 is larger than the opening width of the guide hole 8, which can prevent the limiting component 9 from falling out of the guide hole (8). A baffle is provided at one end of the guide rod 10 near the guide hole 8. The grinding sleeve 7 is connected to the limiting component 9 through the guide hole 8 and is set inside the housing 3 to ensure the coaxiality of the grinding sleeve 7 and the rotor, avoid uneven grinding caused by offset, and realize the adaptive floating of the grinding sleeve 7.

[0027] The bottom opening of the housing 3 is connected to a discharge pipe 11. Four insertion holes 12 are evenly opened on the inner wall of the discharge pipe 11. The opening cross section of the insertion hole 12 is convex. A second spring 13 is placed on the inner wall of the insertion hole 12. A push rod 14 is inserted into the opening end of the insertion hole 12. A ball head section 15 is fixedly connected to the top of the push rod 14. The card seat 16 abuts against one end of the second spring 13 to fix the position of the push rod 14 and limit the second spring 13 to prevent the slurry from accumulating at the push rod 14.

[0028] A retainer 16 is provided at one end of the push rod 14 that is inserted into the insertion hole 12. The retainer 16 abuts against one end of the second spring 13. There are four push rods 14, which are arranged in a cross shape inside the discharge pipe 11. There is a gap between the four push rods 14 for the flow of slurry. When the slurry impacts the push rod 14, the push rod 14 can compress the second spring 13 to achieve buffering. At the same time, the reset action of the second spring 13 drives the push rod 14 to vibrate, thereby achieving the anti-blocking effect of the discharge port and preventing aluminum hydroxide powder from accumulating and blocking in the discharge pipe 11.

[0029] An aluminum hydroxide powder grinding device, using the above-mentioned apparatus, includes the following steps: The first step is to mix the aluminum hydroxide powder to be ground with an appropriate amount of grinding media to make a slurry, and pour it into the feed hopper 4 at the top of the machine housing 3 to ensure that the slurry can flow smoothly between the machine housing 3 and the grinding sleeve 7. The second step is to start the driver 5, which drives the rotor assembly 6 to rotate at high speed through the transmission mechanism. The grinding section 603 on the outer circumference of the rotor body 601 rotates synchronously with the rotor assembly 6. The grinding teeth on the grinding section 603 cooperate with the grinding sleeve 7 to grind the aluminum hydroxide slurry flowing into the gap. The gap between the rotor assembly 6 and the grinding sleeve 7 becomes smaller as it goes down, and the grinding becomes finer, achieving the effect of graded grinding. In the third step, during the grinding process, several rotor bodies 601 with progressively increasing outer diameters grind the slurry step by step. At the same time, the grinding sleeve 7 remains stable under the action of the limiting component 9 and the guide rod 10. The connecting rod 905 in the limiting component 9 slides along the sleeve 901. The first spring 904 plays a buffering and limiting role to prevent the grinding sleeve 7 from shifting. The grinding sleeve 7 automatically adapts to avoid hard particles according to the grinding situation. After the gap increases instantly and the hard block passes through, the first spring 904 resets and drives the grinding sleeve 7 to re-adhere to the rotor assembly 6 to prevent jamming. In the fourth step, the ground aluminum hydroxide slurry flows downward along the gap between the grinding sleeve 7 and the rotor assembly 6 under the pressure generated by the rotation of the rotor assembly 6, and enters the discharge pipe 11 at the bottom of the housing 3. In the fifth step, when the slurry flows through the discharge pipe 11, it is discharged from the gap between the four push rods 14. When the ground powder is discharged, it impacts the ball head section 15 of each push rod 14, causing the push rod 14 to compress the second spring 13 and slide along the insertion hole 12. The push rod 14 returns to its original position under the elastic action of the second spring 13. The push rod 14 continues to vibrate under the elastic return action of the second spring 13, which realizes the breaking of the powder arch and the prevention of blockage during discharge. It can play an auxiliary role in preventing blockage of the slurry during the discharge process.

[0030] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of the equivalent elements of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0031] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An aluminum hydroxide powder grinding device, comprising a housing (3), a rotor assembly (6), and a grinding sleeve (7), characterized in that: The rotor assembly (6) includes a rotor body (601), the outer circumference of which is provided with uniformly distributed grinding sections (603). The rotor body (601) is composed of several rotors with progressively increasing outer diameters, and the rotors with progressively increasing outer diameters are connected by connecting sections (602). A ring of limiting components (9) and guide rods (10) is arranged around the middle of the inner wall of the housing (3). The limiting components (9) and guide rods (10) are evenly distributed alternately. The grinding sleeve (7) A guide hole (8) is opened on the outer side of the middle part. The top ends of the limiting component (9) and the guide rod (10) respectively abut against the inside of the guide hole (8). The limiting component (9) includes a sleeve (901). A connecting rod (905) is slidably fitted inside the sleeve (901). A limiting seat (903) is provided at one end of the annular seat (902). An annular seat (902) is provided at one end of the connecting rod (905). A first spring (904) is sleeved at one end of the connecting rod (905).

2. The aluminum hydroxide powder grinding equipment according to claim 1, characterized in that: The grinding section (603) extends circumferentially along the rotor body (601), and the outer circumferential surface of the grinding section (603) is provided with a plurality of uniformly distributed grinding teeth. The rotor body (601) and the grinding section (603) are integrally formed structures.

3. The aluminum hydroxide powder grinding equipment according to claim 2, characterized in that: The connecting section (602) is arranged with a smaller upper part and a larger lower part. The top of the rotor body (601) is connected to a driver (5) through a transmission mechanism. The housing (3) is sleeved on the outside of the rotor assembly (6). The bottom surface of the housing (3) is fixedly connected to a support leg (2).

4. The aluminum hydroxide powder grinding equipment according to claim 2, characterized in that: The housing (3) is a cylindrical shape with openings at both the top and bottom. A feed hopper (4) is welded to the top opening of the housing (3). The housing (3) abuts against the grinding sleeve (7) through a limiting component (9) and a guide rod (10).

5. The aluminum hydroxide powder grinding equipment according to claim 4, characterized in that: The grinding sleeve (7) is a stepped cylindrical shape with a larger upper part and a smaller lower part. The inner diameter of the grinding sleeve (7) gradually decreases from top to bottom. The grinding sleeve (7) surrounds the outside of the rotor assembly (6). The shape of the grinding sleeve (7) matches the shape of the rotor assembly (6) and is closely fitted to the rotor assembly (6).

6. The aluminum hydroxide powder grinding equipment according to claim 1, characterized in that: The sleeve (901) is a cylindrical shape with one end open. The diameter of the connecting rod (905) matches the diameter of the opening of the sleeve (901). One end of the connecting rod (905) extends to the outside of the sleeve (901). The annular seat (902) is abutted against the inner wall of the opening of the sleeve (901) on one side.

7. The aluminum hydroxide powder grinding equipment according to claim 6, characterized in that: The diameter of the annular seat (902) is larger than the inner diameter of the sleeve (901) opening. The other side of the annular seat (902) is abutted against one end of the first spring (904). The first spring (904) is placed inside the sleeve (901) and is located between the annular seat (902) and the inner wall of the sleeve (901).

8. The aluminum hydroxide powder grinding equipment according to claim 7, characterized in that: The diameter of the limiting seat (903) is greater than the opening width of the guide hole (8). The guide rod (10) is provided with a baffle at one end near the guide hole (8). The grinding sleeve (7) is connected to the limiting component (9) inside the housing (3) through the guide hole (8).

9. The aluminum hydroxide powder grinding equipment according to claim 1, characterized in that: At the bottom opening of the casing (3), a discharge pipe (11) is communicatively provided. Four jacks (12) are evenly arranged on the inner wall of the discharge pipe (11). The opening cross-section of the jack (12) is in a "convex" shape. A second spring (13) is placed on the inner wall of the jack (12). A ejector rod (14) is inserted into the opening end of the jack (12). The top end of the ejector rod (14) is fixedly connected with a ball head section (15).

10. The aluminum hydroxide powder grinding equipment according to claim 9, characterized in that: A clamping seat (16) is arranged at one end of the ejector rod (14) inserted into the jack (12). The clamping seat (16) abuts against one end of the second spring (13). The number of the ejector rods (14) is four. The four ejector rods (14) are arranged in a cross shape inside the discharge pipe (11). There is a gap between the four ejector rods (14).

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