A pre-sanding process for large particles

Abstract

The present application relates to a kind of pre-sand grinding processes of large particles, specifically including the following steps: step one: by using crusher, large oxide particles are broken;Step two: by water injection device, the oxide particles are dispersed with water;Step three: the oxide particles after being dispersed with water are transported to pre-sand grinding device and broken to specified size, then output;Step four: the oxide particles meeting the specified size are put into sand mill and ground into oxide powder;After two driving rollers pass through the two corners of the crushing box, the crushing box moves downward due to gravity, collides with the support plate to generate vibration, changes the position and angle of the oxide particles in the crushing box, and by controlling the reciprocating extension of the extension end of the hydraulic cylinder, the oxide particles in the crushing box are crushed multiple times, so that the particle size of the internal oxide particles meets the requirements, and the crushing efficiency of the oxide particles is improved.

Description

Technical Field

[0001] This invention relates to the field of material processing technology, specifically to a pre-grinding process for large particles. Background Technology

[0002] Sand mills are used for wet grinding of chemical coatings. When discharging, the material needs to be filtered through a filter screen to remove particulate matter. Due to the effect of van der Waals forces, the dispersed coating powder is prone to re-agglomeration, which can easily clog the discharge filter screen, affecting the discharge speed and reducing production efficiency. A solution is needed to address the above-mentioned technical problems.

[0003] As described in the patent document with publication number CN109174334B, the device is equipped with at least two movable filter discs, so that the at least two movable filter discs can be used alternately. When one of the movable filter discs is clogged, the other movable filter disc is used, and the clogged movable filter disc is moved to the cleaning chamber for cleaning and is ready for use.

[0004] However, most existing sand mills use single-stage grinding, which involves only one grinding process. This often results in substandard grinding accuracy and low grinding quality, and is prone to clogging. In addition, existing pre-grinding devices are difficult to efficiently crush oxide particles that do not meet the specified particle size. Furthermore, existing pre-grinding devices are inconvenient for conveying oxide particles that meet the specified particle size to the subsequent sand milling device. Summary of the Invention

[0005] The technical problem that this solution addresses is:

[0006] (1) How to solve the problem that most sand mills use single-stage grinding, and that existing pre-sand milling devices are difficult to efficiently crush non-compliant oxide particles;

[0007] (2) How to solve the problem that the existing pre-grinding device is inconvenient to transport oxide particles that meet the specified particle size into the grinding device.

[0008] The objective of this invention can be achieved through the following technical solution: a pre-grinding process for large particles, specifically including the following steps:

[0009] Step 1: Crush large oxide particles using a crusher;

[0010] Step 2: Disperse the oxide particles with water using a water injection device;

[0011] Step 3: The oxide particles, after being dispersed with water, are conveyed to a pre-grinding device for crushing to the specified particle size, and then output.

[0012] Step 4: Feed oxide particles that meet the specified particle size into the sand mill and grind them into oxide powder.

[0013] A further technical improvement of the present invention is that, in step two above, since the oxide particles after adding water are in a dispersed state, the crushing efficiency is improved during pre-grinding.

[0014] A further technical improvement of the present invention is that: in step three above, the support plate provided in the pre-grinding device is in contact with the crushing plate. The support plate not only assists the crushing plate in crushing the oxide particles, but also changes the position and angle of the oxide particles in the crushing box through the collision between the support plate and the crushing box, so as to facilitate the control of the particle size of the oxide particles within the specified range.

[0015] A further technical improvement of the present invention is that: in step three above, the tilting frame in the pre-grinding device is rotatably arranged in the rotating groove, and at the same time, a push-pull spring is elastically arranged between the tilting frame and the top wall of the rotating plate. Through the push-pull spring's push-pull action on the tilting frame, the push roller can drive the crushing box to collide with the support plate, and at the same time, it can also be reset, which is convenient for the next use.

[0016] A further technical improvement of the present invention is that, in step three above, the feeding pipe in the pre-grinding device is inclined and the output end of the feeding pipe is located above and behind the crushing box, so that the feeding pipe will not obstruct the normal movement of the crushing plate.

[0017] A further technical improvement of the present invention is that: in step three above, servo motors are installed on the two support frames in the pre-grinding device to flip the U-shaped plate simultaneously, so as to pour the oxide particles in the crushing box onto the conveyor belt and facilitate their transport to the subsequent grinding device for grinding into oxide powder.

[0018] A further technical improvement of the present invention is that: the pre-grinding device includes a base, two support frames are symmetrically arranged on the top two sides of the base, a U-shaped plate is rotatably arranged between the two support frames, a crushing box is longitudinally slidably arranged on the front side of the U-shaped plate via a guide rail, a hydraulic cylinder is fixedly arranged on the U-shaped plate above the crushing box, a crushing pressure plate is fixedly installed on the extended end of the hydraulic cylinder, the size of the crushing pressure plate corresponds to the size of the crushing box, a third lever is fixedly connected to the extended end of the hydraulic cylinder above the crushing pressure plate, two vibration mechanisms for improving the crushing efficiency of oxide particles are symmetrically arranged on the lower two sides of the crushing box, and transmission mechanisms for driving the corresponding vibration mechanisms are symmetrically arranged on the two sides of the crushing box.

[0019] A further technical improvement of the present invention is that: the vibration mechanism includes a rotating plate rotatably disposed on the front of the U-shaped plate, a rotating groove is provided at one end of the rotating plate, a flipping frame is rotatably disposed inside the rotating groove, a pushing roller is rotatably disposed at one end of the flipping frame, the pushing roller is located below the crushing box, and a limiting block for limiting the flipping frame from over-flipping is fixedly installed on the inner wall of the rotating groove.

[0020] A further technical improvement of the present invention is as follows: a guide ring is fixedly installed on the rotating groove on one side of the limiting block. One end of the guide ring movably passes through the tilting frame and is fixedly connected to the top wall of the rotating plate. A push-pull spring is elastically arranged between the tilting frame and the top wall of the rotating plate, and the push-pull spring is sleeved on the guide ring. The extended end of the hydraulic cylinder is controlled to extend to its maximum length. During this process, the crushing pressure plate moves downward and extends into the crushing box, cooperating with the support plate to crush the oxide particles inside the crushing box. When the extended end of the hydraulic cylinder is at its maximum length, the distance between the crushing pressure plate and the bottom of the inner wall of the crushing box is less than the diameter of the specified particle size of the oxide particles. During the process of controlling the extended end of the hydraulic cylinder to extend from its shortest to its maximum length, it drives the two second transmission rods, the first transmission rod, and the rotating plate to rotate, causing the push roller to roll on the outer wall of the crushing box, thereby causing the tilting frame to tilt and providing compression to the push-pull spring. When the push roller reaches the bottom corner of the crushing box, it is reset by the push-pull spring, lifting the tilting frame. The hydraulic cylinder provides thrust, causing the push rollers to reach the bottom of the crushing box. After the crushing plate and the crushing box work together to crush the oxide particles inside, the extended end of the hydraulic cylinder retracts to a set position. At this point, the push rollers contact the bottom of the crushing box. During this process, the distance between the crushing plate and the crushing box increases. As the extended end of the hydraulic cylinder retracts to its shortest position, the limiting block provides support to the tilting frame, allowing the two push rollers to provide an upward thrust to the crushing box, causing it to separate from the support plate. After the two push rollers pass the two corners of the crushing box, the crushing box moves downward due to gravity, colliding with the support plate and generating vibration. This changes the position and angle of the oxide particles inside the crushing box. By controlling the extended end of the hydraulic cylinder to continue reciprocating in its longest state and at a set length, the oxide particles inside the crushing box are crushed multiple times, ensuring that the particle size of the internal oxide particles meets the specifications. This process improves the crushing efficiency of the oxide particles.

[0021] A further technical improvement of the present invention is that: the transmission mechanism includes two limiting frames fixedly connected to the front of the U-shaped plate, and a first transmission rod arranged longitudinally is movably inserted on the two limiting frames. A first lever is fixedly connected to the top end of the first transmission rod, and the bottom end of the first transmission rod is movably connected to the end of the rotating plate away from the rotating groove through a second lever.

[0022] A further technical improvement of the present invention is that a second transmission rod is rotatably provided on the U-shaped plate, one end of the second transmission rod is movably connected to the first lever, and the other end of the second transmission rod is movably connected to the third lever.

[0023] A further technical improvement of the present invention is that: a support plate for supporting the crushing box is fixedly installed on the front side of the U-shaped plate, and a feeding pipe for conveying oxide particles that do not reach the specified particle size is fixedly inserted on the back side of the U-shaped plate. The feeding pipe is inclined and the output end of the feeding pipe is located on the upper rear side of the crushing box.

[0024] A further technical improvement of the present invention is that: two rotating shafts are symmetrically fixedly installed on both sides of the U-shaped plate, and the two rotating shafts respectively movably pass through the corresponding support frame. Each of the two support frames is equipped with a servo motor for driving the corresponding rotating shaft to rotate. When the oxide particles in the crushing box all meet the specified particle size, the hydraulic cylinder is controlled to retract to its shortest length. The two servo motors operate simultaneously and in the same direction, cooperating with the corresponding rotating shafts, so that the U-shaped plate flips over, pouring the oxide particles in the crushing box onto the conveyor belt, so as to facilitate the conveying of oxide particles that meet the specified particle size to the external sand grinding device for sand grinding.

[0025] A further technical improvement of the present invention is that a conveyor belt for conveying oxide particles of a specified particle size is provided on the base directly below the U-shaped plate.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] In use, the hydraulic cylinder extends to its maximum length. During this process, the crushing plate moves downwards and extends into the crushing box, working in conjunction with the support plate to crush the oxide particles inside the crushing box. When the hydraulic cylinder is at its maximum length, the distance between the crushing plate and the bottom of the inner wall of the crushing box is less than the diameter of the oxide particles. As the hydraulic cylinder extends from its shortest to its maximum length, it drives the two second transmission rods, the first transmission rod, and the rotating plate to rotate, causing the push roller to roll on the outer wall of the crushing box. This causes the tilting frame to tilt, compressing the push-pull spring. When the push roller reaches the bottom corner of the crushing box, the push-pull spring resets, providing thrust to the tilting frame, causing the push roller to reach the bottom of the crushing box. The crushing plate and the crushing box work together to crush the oxide particles inside the crushing box. After crushing, the extended end of the hydraulic cylinder retracts to the set position. At this time, the pushing roller contacts the bottom of the crushing box. During this process, the distance between the crushing pressure plate and the crushing box increases. As the extended end of the hydraulic cylinder retracts to its shortest position, the limiting block provides support for the tilting frame, allowing the two pushing rollers to provide an upward thrust to the crushing box, causing it to separate from the support plate. After the two pushing rollers pass the two corners of the crushing box, the crushing box moves downward due to gravity, colliding with the support plate and generating vibration. This changes the position and angle of the oxide particles inside the crushing box. By controlling the extended end of the hydraulic cylinder to continue reciprocating in its longest state and at the set length, the oxide particles inside the crushing box are repeatedly squeezed and crushed, ensuring that the particle size of the internal oxide particles meets the specifications. This process improves the crushing efficiency of oxide particles.

[0028] When the oxide particles in the crushing box meet the specified particle size, the hydraulic cylinder is controlled to retract to its shortest length. Two servo motors operate simultaneously and in the same direction, and in conjunction with the corresponding rotating shaft, the U-shaped plate is flipped, causing the oxide particles in the crushing box to be poured onto the conveyor belt. This facilitates the transport of oxide particles that meet the specified particle size to an external sanding device for sanding. Attached Figure Description

[0029] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0030] Figure 1 This is a flowchart illustrating the overall process of this invention.

[0031] Figure 2 This is a schematic diagram of the pre-grinding device of the present invention;

[0032] Figure 3 This is a schematic diagram of the front structure of the U-shaped plate of the present invention;

[0033] Figure 4 This is a schematic diagram of the transmission mechanism structure of the present invention;

[0034] Figure 5 This is a schematic diagram of the vibration mechanism structure of the present invention;

[0035] Figure 6 For the present invention Figure 5 Enlarged view of the structure at point A in the middle.

[0036] In the diagram: 1. Hydraulic cylinder; 2. U-shaped plate; 3. Servo motor; 4. Transmission mechanism; 5. Vibration mechanism; 6. Base; 7. Conveyor belt; 8. Support frame; 9. Rotating shaft; 10. Feeding pipe; 11. Crushing box; 12. Support plate; 13. Crushing pressure plate; 14. Third lever; 401. First lever; 402. First transmission rod; 403. Limiting frame; 404. Second lever; 405. Second transmission rod; 501. Rotating plate; 502. Tilting frame; 503. Guide ring; 504. Rotating groove; 505. Limiting block; 506. Push-pull spring. Detailed Implementation

[0037] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figures 1-6 As shown, a pre-grinding process for large particles specifically includes the following steps:

[0039] Step 1: Crush large oxide particles using a crusher;

[0040] Step 2: Disperse the oxide particles with water using a water injection device;

[0041] Step 3: The oxide particles, after being dispersed with water, are conveyed to a pre-grinding device for crushing to the specified particle size, and then output.

[0042] Step 4: Feed oxide particles that meet the specified particle size into the sand mill and grind them into oxide powder.

[0043] Please see Figures 2-6As shown, in step two above, since the oxide particles are in a dispersed state after adding water, the crushing efficiency is improved during pre-grinding. In step three above, the support plate 12 in the pre-grinding device contacts the crushing pressure plate 13. The support plate 12 not only assists the crushing pressure plate 13 in crushing the oxide particles by squeezing, but also changes the position and angle of the oxide particles in the crushing box 11 through the collision between the support plate 12 and the crushing box 11, making it easier to control the particle size of the oxide particles within the specified range. In step three above, the tilting frame 502 in the pre-grinding device is rotatably set in the rotating groove 504. At the same time, a push-pull spring 5 is elastically set between the tilting frame 502 and the top wall of the rotating plate 501. 06. Through the push-pull action of the push-pull spring 506 on the tilting frame 502, the push roller can drive the crushing box 11 to collide with the support plate 12, and at the same time, it can also reset, which is convenient for the next use. In the above step three, the feeding pipe 10 in the pre-grinding device is inclined, and the output end of the feeding pipe 10 is located above and behind the crushing box 11, so that the feeding pipe 10 will not obstruct the normal movement of the crushing pressure plate 13. In the above step three, the two support frames 8 in the pre-grinding device are equipped with servo motors 3 to simultaneously tilt the U-shaped plate 2, which makes it convenient to pour the oxide particles in the crushing box 11 onto the conveyor belt 7, so as to transport them to the subsequent grinding device for grinding into oxide powder.

[0044] Please see Figures 2-6 As shown, the aforementioned pre-grinding device includes a base 6. Two support frames 8 are symmetrically arranged on the top two sides of the base 6. A U-shaped plate 2 is rotatably arranged between the two support frames 8. A crushing box 11 is longitudinally slidably arranged on the front side of the U-shaped plate 2 via a guide rail. A hydraulic cylinder 1 is fixedly arranged on the U-shaped plate 2 above the crushing box 11. A crushing pressure plate 13 is fixedly installed on the extended end of the hydraulic cylinder 1. The size of the crushing pressure plate 13 corresponds to the size of the crushing box 11. A third lever 14 is fixedly connected to the extended end of the hydraulic cylinder 1 above the crushing pressure plate 13. Two vibration mechanisms 5 for improving the crushing efficiency of oxide particles are symmetrically arranged on the lower two sides of the crushing box 11. Transmission mechanisms 4 for driving the corresponding vibration mechanisms 5 are symmetrically arranged on the two sides of the crushing box 11.

[0045] Please see Figure 3 , Figure 5 and Figure 6 As shown, the vibration mechanism 5 includes a rotating plate 501 rotatably disposed on the front of the U-shaped plate 2. A rotating groove 504 is provided at one end of the rotating plate 501. A flipping frame 502 is rotatably disposed inside the rotating groove 504. A push roller is rotatably disposed at one end of the flipping frame 502. The push roller is located below the crushing box 11. A limiting block 505 is fixedly installed on the inner wall of the rotating groove 504 to limit the flipping frame 502 from over-flipping.

[0046] Please see Figure 6As shown, a guide ring 503 is fixedly installed on the rotating groove 504 on one side of the aforementioned limiting block 505. One end of the guide ring 503 movably passes through the tilting frame 502 and is fixedly connected to the top wall of the rotating plate 501. A push-pull spring 506 is elastically arranged between the tilting frame 502 and the top wall of the rotating plate 501, and the push-pull spring 506 is sleeved on the guide ring 503. The extended end of the control hydraulic cylinder 1 extends to its maximum length. During this process, the crushing pressure plate 13 moves downward and extends into the crushing box 11, cooperating with the support plate 12 to crush the oxide particles inside the crushing box 11. When the extended end of the hydraulic cylinder 1 is at its longest position, the distance between the crushing plate 13 and the bottom of the inner wall of the crushing box 11 is less than the diameter of the oxide particles. During the process of controlling the extended end of the hydraulic cylinder 1 from its shortest to its longest position, it drives the two second transmission rods 405, the first transmission rod 402, and the rotating plate 501 to rotate, causing the push roller to roll on the outer wall of the crushing box 11. This causes the tilting frame 502 to tilt, providing compression to the push-pull spring 506. When the push roller reaches the bottom corner of the crushing box 11, it is compressed by the push-pull spring 506. The hydraulic cylinder 1 is positioned so that it provides thrust to the tilting frame 502, causing the push rollers to reach below the crushing box 11. After the crushing plate 13 and the crushing box 11 work together to crush the oxide particles inside the crushing box 11, the extended end of the hydraulic cylinder 1 is controlled to retract to a set position. At this time, the push rollers contact the bottom of the crushing box 11. During this process, the distance between the crushing plate 13 and the crushing box 11 increases. As the extended end of the hydraulic cylinder 1 retracts to its shortest position, the limiting block 505 provides support to the tilting frame 502, causing the two push rollers to lift the crushing box 11. An upward thrust is applied, causing it to separate from the support plate 12. After the two push rollers pass the two corners of the crushing box 11, the crushing box 11 moves downward due to gravity and collides with the support plate 12, generating vibration. This changes the position and angle of the oxide particles inside the crushing box 11. By controlling the extended end of the hydraulic cylinder 1 to continue to reciprocate in its longest state and at a set length, the oxide particles inside the crushing box 11 are repeatedly squeezed and crushed, so that the particle size of the oxide particles inside all meet the specifications. This process improves the crushing efficiency of oxide particles.

[0047] Please see Figure 4 and Figure 5 As shown, the transmission mechanism 4 mentioned above includes two limiting frames 403 that are fixedly connected to the front of the U-shaped plate 2. The two limiting frames 403 are movably inserted with a first transmission rod 402 arranged longitudinally. The top end of the first transmission rod 402 is fixedly connected to a first lever 401, and the bottom end of the first transmission rod 402 is movably connected to the end of the rotating plate 501 away from the rotating groove 504 through a second lever 404.

[0048] Please see Figure 3 and Figure 4As shown, a second transmission rod 405 is rotatably mounted on the U-shaped plate 2. One end of the second transmission rod 405 is movably connected to the first lever 401, and the other end of the second transmission rod 405 is movably connected to the third lever 14.

[0049] Please see Figure 2 and Figure 3 As shown, a support plate 12 for supporting the crushing box 11 is fixedly installed on the front side of the U-shaped plate 2, and a feeding pipe 10 for conveying oxide particles that do not reach the specified particle size is fixedly inserted on the back side of the U-shaped plate 2. The feeding pipe 10 is inclined and the output end of the feeding pipe 10 is located above and behind the crushing box 11.

[0050] Please see Figure 2 As shown, two rotating shafts 9 are symmetrically fixed on the two side walls of the U-shaped plate 2. The two rotating shafts 9 respectively move through the corresponding support frame 8. Each of the two support frames 8 is equipped with a servo motor 3 for driving the corresponding rotating shaft 9 to rotate. When the oxide particles in the crushing box 11 all meet the specified particle size, the hydraulic cylinder 1 is controlled to retract to its shortest length. The two servo motors 3 operate simultaneously and in the same direction, cooperating with the corresponding rotating shafts 9, so that the U-shaped plate 2 is flipped, and the oxide particles in the crushing box 11 are poured onto the conveyor belt 7, so that the oxide particles that meet the specified particle size can be transported to the external sand grinding device for sand grinding.

[0051] Please see Figure 2 As shown, a conveyor belt 7 for conveying oxide particles of a specified particle size is provided on the base 6 directly below the U-shaped plate 2.

[0052] Working Principle: In use, the external feeding device is first activated. At this time, the extended end of the hydraulic cylinder 1 is at its shortest length, and the crushing plate 13 is positioned above the output end of the feeding pipe 10. Oxide particles that do not meet the specified particle size are conveyed into the crushing box 11 through the feeding pipe 10. When the oxide particles in the crushing box 11 reach the threshold, the external feeding device is deactivated. The extended end of the hydraulic cylinder 1 is then extended to its maximum length. During this process, the crushing plate 13 moves downwards and extends into the crushing box 11, working in conjunction with the support plate 12 to crush the oxide particles inside the crushing box 11. When the extended end of the hydraulic cylinder 1 is at its maximum length, the crushing plate 13 and the crushing box 1... The distance between the bottom of the inner wall of the crushing box 11 is less than the diameter of the oxide particles. During the process of extending the extended end of the hydraulic cylinder 1 from its shortest to its longest length, it drives the two second transmission rods 405, the first transmission rod 402, and the rotating plate 501 to rotate, causing the push roller to roll on the outer wall of the crushing box 11. This causes the tilting frame 502 to tilt, providing compression to the push-pull spring 506. When the push roller reaches the bottom corner of the crushing box 11, it is reset by the push-pull spring 506, providing thrust to the tilting frame 502, causing the push roller to reach the bottom of the crushing box 11. When the crushing plate 13 and the crushing box 11 cooperate with each other to crush the oxide particles inside the crushing box 11... After the particles are crushed, the extended end of the hydraulic cylinder 1 retracts to a set position. At this time, the push roller contacts the bottom of the crushing box 11. During this process, the distance between the crushing plate 13 and the crushing box 11 increases. As the extended end of the hydraulic cylinder 1 retracts to its shortest position, the limiting block 505 provides support for the tilting frame 502, so that the two push rollers provide an upward thrust to the crushing box 11, causing it to separate from the support plate 12. After the two push rollers pass the two corners of the crushing box 11, due to the influence of gravity, the crushing box 11 moves downward and collides with the support plate 12, generating vibration, which will change the position of the oxide particles inside the crushing box 11. With respect to the angle, the extended end of the hydraulic cylinder 1 continues to reciprocate in its longest state and at a set length, repeatedly squeezing and crushing the oxide particles in the crushing box 11, so that the particle size of the oxide particles inside all meet the specifications. This process improves the crushing efficiency of the oxide particles. When the oxide particles in the crushing box 11 all meet the specified particle size, the hydraulic cylinder 1 is controlled to retract to its shortest length. Two servo motors 3 operate simultaneously and in the same direction, cooperating with the corresponding rotating shaft 9, causing the U-shaped plate 2 to flip, pouring the oxide particles in the crushing box 11 onto the conveyor belt 7, so that the oxide particles that meet the specified particle size can be easily transported to the external sand grinding device for sand grinding.

[0053] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A pre-grinding process for large particles, characterized in that, Specifically, the following steps are included: Step 1: Crush large oxide particles using a crusher; Step 2: Disperse the oxide particles with water using a water injection device; Step 3: The oxide particles, after being dispersed with water, are conveyed to a pre-grinding device for crushing to the specified particle size, and then output. The pre-grinding device includes a hydraulic cylinder (1), a crushing plate (13) driven and connected to the hydraulic cylinder (1), a support plate (12), and a crushing box (11) that can be longitudinally slidably arranged above the support plate (12); the pre-grinding device also includes a vibration mechanism (5) and a transmission mechanism (4) for transmitting the linear motion of the hydraulic cylinder (1) to the vibration mechanism (5). In step three, by controlling the extension end of the hydraulic cylinder (1) to reciprocate, the crushing plate (13) is driven to crush the oxide particles placed in the crushing box (11). At the same time, the transmission mechanism (4) drives the vibration mechanism (5) to move. During the retraction of the extension end of the hydraulic cylinder (1), the pushing roller of the vibration mechanism (5) pushes the crushing box (11) away from the support plate (12). Then, the crushing box (11) falls back under the action of gravity and collides with the support plate (12) to generate vibration, thereby changing the position and angle of the oxide particles in the crushing box (11). The vibration mechanism (5) includes a rotating plate (501) rotatably mounted, a tilting frame (502) rotatably mounted in a rotating groove (504) at the end of the rotating plate (501), and a push-pull spring (506) mounted between the tilting frame (502) and the top wall of the rotating plate (501); the push roller is rotatably mounted on the tilting frame (502); through the push-pull action of the push-pull spring (506), the push roller can be reset after driving the crushing box (11) to collide with the support plate (12); Step 4: Feed oxide particles that meet the specified particle size into the sand mill and grind them into oxide powder.

2. The pre-grinding process for large particles according to claim 1, characterized in that, In step two above, since the oxide particles are in a dispersed state after adding water, the crushing efficiency of the oxide particles will be improved during pre-grinding.

3. The pre-grinding process for large particles according to claim 1, characterized in that, In step three above, the feeding pipe (10) in the pre-grinding device is set at an angle, and the output end of the feeding pipe (10) is located above and behind the crushing box (11), so that the feeding pipe (10) will not obstruct the normal movement of the crushing plate (13).

4. The pre-grinding process for large particles according to claim 1, characterized in that, In step three above, the two support frames (8) in the pre-grinding device are equipped with servo motors (3) to flip the U-shaped plate (2) at the same time, so as to pour the oxide particles in the crushing box (11) onto the conveyor belt (7).

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