Filtering device for cement expanding agent raw materials

Abstract

The utility model relates to a filtering device for cement expanding agent raw materials. The filtering device comprises a filtering box and a rotary drum assembly, a first grinding part and a filter screen assembly are arranged in the filter box, raw materials are subjected to primary grinding and filtering in the filter box, and unqualified raw materials enter the rotary drum assembly through a connecting part to be subjected to secondary grinding and filtering; the drum assembly comprises a filter drum and a second grinding part, the filter drum is arranged on the second filter box through a rotating shaft, the rotating shaft is connected with a driving mechanism, a plurality of filter holes are formed in the filter drum, and a blade plate is arranged on the inner wall of the filter drum; the second grinding part is inserted into the filter cartridge and is also connected with a driving mechanism; in the working process, raw materials needing to be filtered firstly enter the filtering box to be filtered for the first time, then unqualified raw materials enter the filtering cylinder, the driving mechanism is started, the filtering cylinder rotates, and the raw materials are clamped by the blade plate and repeatedly rotate to the second grinding part to be ground till the raw materials pass through filtering holes after being ground to be qualified. The grinding device has the advantages of being more sufficient in grinding, simple in structure and convenient to mount and dismount.

Description

Technical Field

[0001] The utility model relates to the technical field of the production of oil well cement expanders, in particular to a filtering device for raw materials of cement expanders. Background Technique

[0002] A cement expander is a chemical admixture. When it is added to cement, as the cement sets and hardens, it can play a role in compensating for shrinkage, prestressing the tensioned steel bars, and fully filling the gaps in the cement as it expands in volume. When producing, the raw materials need to be mixed and stirred until they are in a uniform state. Therefore, various raw materials need to be filtered before production.

[0003] These raw materials are all solids. When filtering them, they usually need to be crushed and ground and filtered through a filter screen. However, there are some deficiencies in the existing filtering devices for raw materials of cement expanders when in use: Firstly, when the existing filtering device is grinding, when too much raw material is poured in, some raw materials will be left out and not fully ground, resulting in insufficient filtering of the obtained product and low utilization rate. Secondly, when too much raw material is poured in, since the materials accumulate on the filter screen, the unqualified materials will be squeezed under the filter screen, resulting in some impurities not being filtered out.

[0004] Therefore, based on the deficiencies of the existing device feedback from customers, the inventor made further improvements according to the proposed defects and deficiencies to overcome the above problems. Content of the Utility Model

[0005] The purpose of the utility model is to overcome the shortcomings of the existing technology and provide a filtering device for raw materials of cement expanders that is more fully ground, has a simple structure, and is convenient for installation and disassembly.

[0006] The purpose of the utility model is achieved through the following technical solutions: A filtering device for raw materials of cement expanders, characterized in that it includes a filtering box and a rotating cylinder assembly;

[0007] A first grinding part and a filter screen assembly are arranged in the filtering box. The raw materials are initially ground and filtered in the filtering box, and the unqualified raw materials enter the rotating cylinder assembly through a connecting part for secondary grinding and filtering;

[0008] The rotating cylinder assembly includes a filtering cylinder and a second grinding part. The filtering cylinder is arranged on a second filtering box through a rotating shaft, and its rotating shaft is connected to a driving mechanism. A plurality of filter holes are opened on the filtering cylinder and blade plates are arranged on the inner wall;

[0009] The second grinding part is inserted into the filtering cylinder and is also connected to a driving mechanism;

[0010] When working, the raw materials to be filtered first enter the filter box for primary filtration. The unqualified raw materials then enter the filter cylinder. The driving mechanism is started. Due to the rotation of the filter cylinder, the raw materials are clamped by the blade plates and repeatedly rotated to the second grinding part for grinding until they are qualified and leak out through the filter holes.

[0011] As a preferred technical solution of the present application, the filter screen assembly includes a filter screen and a lead screw A;

[0012] The filter screen is arranged at an inclined downward angle in the filter box, and the downward end of the filter screen is located at the long notch on the right side wall of the filter box;

[0013] The lead screw A is arranged above the filter screen and is inclined downward like the filter screen. The left end of the lead screw A is connected to the motor A. A long slider is sleeved on the lead screw A, and the bottom end of the long slider contacts the filter screen;

[0014] When the motor A is started, the lead screw A rotates to drive the long slider to move on the filter screen, thereby pushing the unqualified materials on the filter screen into the filter cylinder through the long notch.

[0015] As a preferred technical solution of the present application, it further includes a movable door assembly; the movable door assembly includes a slide rail, a switch door, and a lead screw B;

[0016] An inlet is opened on the barrel body of the filter cylinder. Slide rails are arranged on the left and right sides of the inlet. The bottom of the switch door is adaptively installed with the slide rails. The lead screw B is sleeved on the upper surface of the switch door, and the lead screw B is connected to the motor B;

[0017] When the motor B is started, the lead screw B rotates to drive the switch door to move back and forth on the cabinet - to realize the opening and closing of the inlet.

[0018] As a preferred technical solution of the present application, a plurality of filter holes are circumferentially opened on the barrel body of the filter cylinder, and a plurality of blade plates are spacedly arranged on the inner circumferential side surface thereof. The length of the blade plates is relatively long and does not affect the rotation and grinding of the internal second grinding part, facilitating the clamping of the raw materials that are left out and poured to the bottom of the cylinder to be rotated back onto the second grinding part.

[0019] As a preferred technical solution of the present application, a long rod is arranged on the front plate opposite to the filter cylinder. The end of the long rod extends out of the front plate. An annular groove is inwardly opened on the front plate, and an annular track is arranged in the annular groove. A ball is arranged at the end of the long rod and is adapted to slide with the annular track.

[0020] As a preferred technical solution of the present application, the second grinding part includes a driving grinding roller and a driven grinding roller; the driving grinding roller is connected to a double-output shaft motor. The other output shaft of the driving grinding roller is sleeved with a driving gear, which meshes with a driven gear. The driven gear is sleeved on the driven grinding roller. When the double-output shaft motor is started, the driving and driven gears mesh to make the driving grinding roller and the driven grinding roller rotate relatively for grinding.

[0021] The utility model has the following advantages:

[0022] (1) The grinding is more sufficient, and the quality of the obtained product is higher.

[0023] Currently, the existing devices for filtering solid raw materials usually set a grinding roller structure on the filter screen. When the raw materials are poured into the device, the raw materials are first ground by the grinding roller and then filtered through the filter screen. However, when too much raw material is poured in, some raw materials will fall on the filter screen without being fully ground. Due to the extrusion of too much material on the filter screen, some unground materials will be squeezed through the filter screen, resulting in an impure and low-quality product; this solution designs the filter cylinder structure for this problem. The filter cylinder itself is a rotatable structure, and filter holes for only qualified materials to pass through are opened on the cylinder body of the filter cylinder. At the same time, a blade plate and a second grinding part are arranged inside the filter cylinder in cooperation. When the raw materials enter the filter cylinder, if there are raw materials that have not been ground by the second grinding part and fall to the bottom of the cylinder, when the filter cylinder rotates, the blade plate will carry the raw materials and rotate upward, so that the raw materials are originally ground by the grinding roller. Since unqualified materials cannot pass through the filter holes, during the rotation of the filter cylinder, the materials will be ground by the grinding roller repeatedly, making the grinding more sufficient, and the obtained product is purer and of higher quality; and this solution adopts a secondary filtration method. After the raw materials are initially ground and filtered by the first grinding part in the filter box, the unqualified materials are brought into the filter cylinder by the lead screw and the slider, making the utilization of the raw materials more sufficient.

[0024] (2) The structure is simple, facilitating installation and disassembly.

[0025] When the existing filtering device re-grinds and utilizes the unqualified raw materials, the structure usually adopted is relatively complex. For example, a structure of matching a gear and a rack is used to roll the unqualified raw materials into the filter box for re-filtration, but material loss is likely to occur during this process. This solution adopts a lead screw structure in the filter box. Utilizing the characteristic that the lead screw converts rotation into linear motion, a slider is used to scrape the unqualified materials into the filter cylinder for secondary filtration at one time. The structure is simple, and the installation and disassembly are very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of the first perspective of the utility model;

[0027] Figure 2 is a schematic structural diagram of the top perspective of the utility model;

[0028] Figure 3 is a schematic structural diagram of the front half-section perspective of the utility model;

[0029] Figure 4This is a schematic structural diagram of the filter screen assembly and the rotating cylinder assembly of the present utility model from the first perspective;

[0030] Figure 5 This is a schematic structural diagram of the filter screen assembly and the rotating cylinder assembly of the present utility model from the second perspective;

[0031] Figure 6 This is a schematic structural diagram of the second grinding part of the present utility model;

[0032] Figure 7 This is a schematic structural diagram of the filter screen assembly of the present utility model;

[0033] Figure 8 This is a schematic structural diagram of the filter cylinder and the movable door assembly of the present utility model;

[0034] In the figure: 1 - filter box, 2 - drawer, 3 - filter screen, 4 - lead screw A, 5 - long slider, 6 - motor A, 7 - square groove, 8 - rotating roller, 9 - long slot opening, 10 - mounting seat, 11 - second filter box, 12 - filter cylinder, 13 - front plate, 14 - long rod, 15 - annular groove, 16 - active grinding roller, 17 - driven grinding roller, 18 - driving gear, 19 - driven gear, 20 - blade plate, 21 - slide rail, 22 - switch door, 23 - lead screw B, 24 - motor B, 25 - feed inlet, 26 - connecting part, 27 - rotating motor. Specific embodiments

[0035] The following further describes the present utility model with reference to the accompanying drawings, but the protection scope of the present utility model is not limited to the following description.

[0036] It should be noted that the orientation or positional relationship indicated by "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. Such terms are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0037] It should be noted that, without conflict, the embodiments in the present utility model and the features and technical solutions in the embodiments can be combined with each other.

[0038] Therefore, based on the above problems, refer to Figure 1 and the present utility model proposes a filtering device for raw materials of cement expanding agent to solve the problems.

[0039] (Embodiment 1)

[0040] Refer to Figures 1 to 8, a filtering device for raw materials of cement expansion agent proposed in this implementation scheme, includes a filtering box 1, a filter screen assembly, a rotating cylinder assembly, a first grinding part, and a movable door assembly;

[0041] Among them, referring to Figure 1 , the top of the filtering box 1 is open, and a first grinding part is arranged at the top. A drawer 2 is movably inserted at the lower part of the filtering box 1;

[0042] Among them, referring to Figure 5 and Figure 7 , the filter screen assembly includes a filter screen 3 and a lead screw A4; the filter screen 3 is arranged in the filtering box 1 at a certain downward inclination angle. A lead screw A4 is arranged above the filter screen 3 and is parallel to the filter screen 3. One end of the lead screw extends out of the left side wall of the filtering box 1 and is connected to a motor A6. A long slider 5 is sleeved on the lead screw;

[0043] Among them, referring to Figure 1 and Figure 3 , the filtering box 1 is arranged above the side of the rotating cylinder assembly. A long slot 9 is horizontally opened on the right side wall of the filtering box 1 at the position of the filter screen 3;

[0044] Among them, referring to Figure 6 and Figure 8 , the rotating cylinder assembly includes a filtering cylinder 12 and a second grinding part; the filtering cylinder 12 is rotatably arranged in a second filtering box 11 and has a plurality of filter holes on the cylinder body. A plurality of blade plates 20 are arranged on the inner side wall of the filtering cylinder 12 at a certain interval and along a certain inclination angle. At the position of the plurality of blade plates 20, the second grinding part is inserted into the filtering cylinder 12 and is also arranged in the second filtering box 11;

[0045] Among them, referring to Figure 8 , the movable door assembly includes a slide rail 21, a switch door 22, and a lead screw B23; a feed port 25 is opened on the cylinder body of the filtering cylinder 12. Two slide rails 21 are arranged on the left and right sides of the feed port 25. The switch door 22 is arranged on the slide rail 21 and the lead screw B23 passes through the switch door 22. The lead screw B23 is rotated by a motor B24, so that the switch door 22 moves back and forth on the slide rail 21 to realize the opening and closing of the feed port 25;

[0046] When performing the filtering work, first pour the solid raw materials to be filtered into the opening at the top of the filtering box 1, and start the first grinding part for primary grinding. The ground materials fall on the filter screen 3 for filtering. The qualified materials pass through the filter screen 3 and fall into the drawer 2, while the unqualified materials still remain on the filter screen 3. By starting the motor A6, the lead screw A4 rotates, causing the slider sleeved on the lead screw A4 to move, sweeping the residues on the filter screen 3 downward into the long slot 9, and then through the connecting part 26 to the feed port 25 and into the filtering cylinder 12. By starting the motor B24, the lead screw B23 rotates, causing the switch door 22 to move on the slide rail 21. After closing the feed port 25, rotate the filtering cylinder 12 and the second grinding part inside it to grind the residues. The ground materials leak out through the filter holes on the filtering cylinder 12, thus obtaining the fully ground raw materials.

[0047] Currently, the existing devices for filtering cement expansion agent raw materials do not handle unqualified raw materials sufficiently after filtering, resulting in low utilization rate and wasting certain resources. Moreover, the filter screen 3 of the currently used devices is often fixed in the filter frame, with low filtering efficiency and the situation that impurities may not be filtered out. Therefore, this solution designs a filtering device for cement expansion agent raw materials to solve the above problems. The filtering device of this solution adopts a double-filtering method. After the raw materials are ground by the first grinding part in the filtering box 1, primary filtering is carried out on the filter screen 3, and the residues on the filter screen 3 are swept into the rotating cylinder assembly through the cooperation of the lead screw A4 and the slider for secondary filtering. The filtering method of this solution can grind the raw materials sufficiently, thus improving the utilization rate of the raw materials. The rotating cylinder assembly set in this solution has filter holes only for the qualified raw materials to leak out on the filtering cylinder 12 itself. The unqualified raw materials enter the filtering cylinder 12 and are ground by the blade plates 20 on the inner wall of the filtering cylinder 12 and the second grinding part until the raw materials are ground to the qualified size. Setting the rotating cylinder assembly can not only prevent the leakage of raw materials but also grind and filter the raw materials sufficiently, and there will be no situation where impurities are not filtered out.

[0048] In this embodiment, refer to Figure 1 , for the filtering box 1, the filtering box 1 is rectangular. There is a square hole on the upper surface of the filtering box 1, and a square groove 7 extends upward along the four sides of the square hole. A first grinding assembly is penetrated in the square groove 7. When the raw materials enter the square groove 7, the raw materials are preliminarily ground by the first grinding assembly. At the lower part of the filtering box 1, remove the front plate 13 of the filtering box 1, and slide rails 21 are arranged on both sides of the inner bottom plate of the box. At the same time, a drawer 2 with a handle is installed to match the slide rails 21 of the filtering box 1, and the drawer 2 can be inserted into and pulled out of the filtering box 1 by pushing and pulling the handle, so that the qualified raw materials filtered by the filter screen 3 enter the drawer 2.

[0049] In this embodiment, refer toFigures 1 - 2 For the first grinding part, the first grinding part includes two rotating rollers 8; the two rotating rollers 8 are arranged next to each other in the square groove 7, and a serrated part for grinding is provided on the roller body of the rotating roller 8. Motors are connected to both rotating rollers 8, and the rotating rollers 8 are rotated by starting the motors to grind the raw materials entering the square groove 7.

[0050] In this embodiment, refer to Figure 3 and Figure 7 For the filter screen assembly, the filter screen 3 is fixedly arranged in the filter box 1, and the filter screen 3 is arranged at an inclined downward angle in the filter box 1. One side of the filter screen 3 is connected to the left side wall of the filter box 1, and the other side is connected to the right side wall of the filter box 1. A long slot 9 is provided above the connection of the right side wall for the raw materials that have not entered the drawer 2 to pass through; a lead screw A4 is arranged above the filter screen 3. The total length of the lead screw A4 is the same as the length of the filter screen 3, and the lead screw A4 and the filter screen 3 are both arranged at an inclined downward angle in the filter box 1. The lead screw A4 is parallel to the filter screen 3. The left end of the lead screw A4 passes through the left side wall of the filter box 1, and a motor A6 is arranged at the end. The motor A6 is arranged outside the left side wall of the filter box 1 through the mounting seat 10; the lead screw A4 is rotated by the rotation of the motor A6. A long slider 5 is sleeved on the lead screw A4, and the long slider 5 moves in the left-right direction on the lead screw A4. The bottom end of the long slider 5 is in contact with the filter screen 3, and the residual raw materials on the filter screen 3 can be pushed to the position of the long slot 9 by the movement of the long slider 5.

[0051] In this embodiment, refer to Figure 1 and Figure 5 For the second filter box 11, the second filter box 11 is a rectangular frame. Its front plate 13 is installed and connected to the filter cylinder 12, and the rear plate is installed and connected with the second grinding part. After the raw materials are ground by the rotation of the filter cylinder 12, the ground materials leak into the frame of the second filter box 11 through the filter holes of the filter cylinder 12.

[0052] In this embodiment, refer to Figures 3 - 5 and Figure 8, for the filter cartridge 12, a plurality of filter holes are formed in the cylindrical side surface of the filter cartridge 12, and only qualified raw materials can leak out through the filter holes. The circular surface of the filter cartridge 12 is arranged facing the front plate 13 of the second filter box 11, and the filter cartridge 12 is connected to the front plate 13 through a central shaft. One end of the central shaft is connected to the circular surface of the filter cartridge 12, and the other end thereof passes through the through hole in the front plate 13 and is connected to the rotation motor 27. The central shaft is rotatably arranged in the front plate 13 - that is, the filter cartridge 12 is rotatably connected to the front plate 13. At the same time, a long rod 14 extends from the circular edge of the filter cartridge 12, and symmetrical balls are respectively arranged on the upper and lower surfaces of the end of the long rod 14. An annular groove 15 is formed in the front plate 13, and the two balls slidably fit in the annular groove 15. By rolling the balls on the track of the annular groove 15, it is avoided that the cable is entangled due to the large rotation of the filter cartridge 12. A plurality of blade plates 20 are arranged on the inner side wall of the filter cartridge 12. The blade plates 20 are in the shape of long rectangles and are arranged in the filter cartridge 12 at a certain inclination angle. The length of the blade plates 20 is relatively long. After the raw materials are poured into the filter cartridge 12, by rotating the filter cartridge 12, the raw materials that do not fall on the second grinding part can be clamped by the blade plates 20 and brought back to the second grinding part for grinding.

[0053] In this embodiment, referring to Figure 6 , for the second grinding part, the second grinding part includes a grinding roller and a rotating shaft; the grinding roller includes a driving grinding roller 16 and a driven grinding roller 17; the two grinding rollers are closely adjacent to each other, and saw teeth are formed on the roller bodies of the grinding rollers; the two grinding rollers are both inserted into the filter cartridge 12 and are respectively connected to two rotating shafts at the ends. The rotating shafts pass through the circular surfaces after passing through the filter cartridge 12 and pass through the rear plate of the second filter box 11. The end A of the rotating shaft A passing through the driving grinding roller 16 is connected to a double-output shaft motor, and the other output shaft of the double-output shaft motor is provided with a driving gear 18, while the end B of the rotating shaft B passing through the driven grinding roller 17 is provided with a driven gear 19. The driving gear 18 meshes with the driven gear 19. When the double-output shaft motor is started to rotate the rotating shaft A, due to the meshing of the driving and driven gears 19, the rotating shaft B also rotates - that is, the driving grinding roller 16 and the driven grinding roller 17 rotate relative to each other, thereby grinding the materials falling on them.

[0054] In this embodiment, referring to Figure 2 and Figure 8, for the movable door assembly, a feed inlet 25 is provided on the barrel body of the filter cartridge 12. The feed inlet 25 is a rectangular through hole. On the left and right sides of the feed inlet 25, a slide rail 21 is provided respectively. The bottom of the switch door 22 is adaptively installed with the slide rail 21. The switch door 22 is a rectangular plate, which is adapted to the feed inlet 25 and can cover the feed inlet 25 to close it. A collar is protrudingly provided upward on the upper surface of the switch door 22. A lead screw B23 passes through the collar. The end of the lead screw B23 is connected to a motor B24. The motor B24 is installed on the surface of the filter cartridge 12 via a mounting bracket. When the motor B24 is started, the lead screw B23 rotates, so that the switch door 22 moves on the slide rail 21 - that is, the feed inlet 25 is opened and closed.

[0055] In this embodiment, refer to Figure 1 and Figure 7 , for the connecting part 26, the connecting part 26 is an irregularly shaped channel pipe, which is arranged between the filter box 1 and the rotary drum assembly. The connecting part 26 has openings at both ends. One end faces the long slot 9 of the filter box 1 and is welded to the right side wall of the filter box 1. The other end faces the feed inlet 25 of the filter cartridge 12. The inner bottom surface of the connecting part 26 slopes downward, which is convenient for the unqualified materials to be swept out from the long slot 9 and conveyed into the filter cartridge 12.

[0056] The utility model relates to a filtering device for raw materials of cement expansion agent. When filtering the raw materials of the expansion agent, it is necessary to first crush and grind them and then filter them through the filter screen 3 to obtain qualified raw materials. First, the raw materials to be filtered are put into the square slot 7 on the filter box 1. The first grinding part is started to preliminarily grind the raw materials. The ground materials fall downward onto the filter screen 3. The qualified materials pass through the filter screen 3 and enter the drawer 2 downward. The drawer 2 is detachable and the drawer 2 can be pulled out by the handle to take away the materials. The unqualified raw materials are placed on the filter screen 3. The motor A6 is started. The rotation of the motor A6 drives the lead screw A4 to rotate, so that the long slider 5 moves on the filter screen 3, and the residual materials on the filter screen 3 are piled up to the long slot 9. The materials are swept into the filter cartridge 12 through the connecting part 26. The feed inlet 25 on the filter cartridge 12 is opened and closed by the movement of the switch door 22 controlled by the lead screw B23 on the slide rail 21. After the materials enter the filter cartridge 12, the feed inlet 25 is closed, and the filter cartridge 12 and the second grinding part are rotated synchronously. After the materials are fully ground in the filter cartridge 12, the qualified raw materials leak out through the filter holes on the filter cartridge 12.

[0057] The existing filtering device for cement expansion agent raw materials or general solid raw materials needs to grind the raw materials first and then filter them through the filter 3. However, the existing filtering device is easy to miss the raw materials during grinding, resulting in some materials not being fully ground, resulting in insufficient filtering. In addition, since filtering is performed through the fixed filter 3, when too much raw material is put into the filtering device, due to the squeezing between the materials, unqualified materials may be squeezed through the filter 3, resulting in low filtering efficiency and certain impurities not being filtered out. The filtering device designed in this scheme is a double filtration, which is first ground by the first grinding part on the filter box 1. The ground raw materials are divided into qualified raw materials and unqualified raw materials. The qualified raw materials are directly dropped into the drawer 2 through the filter 3 by gravity. , unqualified raw materials are still placed on the filter screen 3, and the unqualified raw materials are swept into the inverted filter cylinder 12 for secondary grinding through the provided lead screw A4 and the long slider 5. The structure is simple and easy to operate; the secondary grinding mechanism designed in this scheme is composed of a filter cylinder 12 and a second grinding part. The filter cylinder 12 itself is provided with filter holes for only qualified materials to pass through. Through the rotation of the filter cylinder 12 and the second grinding part, the material is fully ground in the cylinder until the material is ground to a qualified size and then leaks out of the filter holes. Such a structural design can make the boring grinding sufficient, and there will be no situation where the material is not fully ground. The filtration efficiency is relatively high. At the same time, a longer blade plate 20 is provided in the filter cylinder 12, which can better drive the material to rotate with the filter cylinder 12 and repeatedly fall on the second grinding part for grinding.

[0058] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A filtering device for cement expansion agent raw materials, characterized in that: It comprises a filter box (1) and a drum assembly; The filter box (1) is provided with a first grinding part and a filter assembly, the raw material is subjected to primary grinding and filtering in the filter box (1), and unqualified raw material enters the drum assembly through the connection part (26) for secondary grinding and filtering; The drum assembly comprises a filter drum (12) and a second grinding part. The filter drum (12) is arranged on the second filter box (1) via a rotating shaft, and the rotating shaft is connected to a driving mechanism. The filter drum (12) is provided with a plurality of filter holes and a blade plate (20) is arranged on the inner wall. The second grinding part is inserted into the filter cartridge (12), and the second grinding part is also connected to a driving mechanism; When working, the raw materials to be filtered first enter the filter box (1) for primary filtration, and unqualified raw materials enter the filter cylinder (12). The driving mechanism is started, and due to the rotation of the filter cylinder (12), the raw materials are clamped by the blade plate (20) and repeatedly rotated to the second grinding part for grinding until the ground materials are qualified and leak out through the filter holes.

2. A filtering device for cement expansion agent raw materials according to claim 1, characterized in that: The filter assembly comprises a filter (3) and a lead screw A (4); The filter screen (3) is arranged in the filter box (1) at an inclined downward angle, and the downward end of the filter screen (3) is located at the long notch (9) on the right side wall of the filter box (1); The lead screw A (4) is arranged above the filter screen (3) and is inclined downward like the filter screen (3). The left end of the lead screw A (4) is connected to the motor A (6). A long slider (5) is sleeved on the lead screw A (4), and the bottom end of the long slider (5) is in contact with the filter screen (3). When the motor A (6) is started, the lead screw A (4) rotates to drive the long slider (5) to move on the filter screen (3), thereby pushing unqualified materials on the filter screen (3) into the filter cartridge (12) through the long slot (9).

3. A filtering device for cement expansion agent raw materials according to claim 2, characterized in that: It also includes a movable door assembly; the movable door assembly includes a slide rail (21), a switch door (22), and a lead screw B (23); The filter cartridge (12) is provided with a feed inlet (25), and slide rails (21) are arranged on the left and right sides of the feed inlet (25). The bottom of the switch door (22) is adapted to be installed with the slide rails (21). A lead screw B (23) is sleeved on the upper surface of the switch door (22), and the lead screw B (23) is connected to a motor B (24). When the motor B (24) is started, the lead screw B (23) is rotated to drive the switch door (22) to move forward and backward on the cabinet to open and close the feed port (25).

4. A filtering device for cement expansion agent raw materials according to claim 3, characterized in that: The filter cylinder (12) has a plurality of filter holes formed on its circumferential surface and a plurality of blade plates (20) are arranged at intervals on its inner circumferential side surface. The blade plates (20) are relatively long and do not affect the rotation and grinding of the second grinding part inside, so that the raw materials missed at the bottom of the cylinder can be clamped and returned to the second grinding part through rotation.

5. A filtering device for cement expansion agent raw materials according to claim 4, characterized in that: The filter cartridge (12) is provided with a long rod (14) on the front plate (13), the end of the long rod (14) extending out to the front plate (13), a circle of annular grooves (15) are provided inwardly on the front plate (13), an annular track is provided in the annular groove (15), and a ball is provided at the end of the long rod (14) to fit and slide with the annular track.

6. A filtering device for cement expansion agent raw materials according to claim 4, characterized in that: The second grinding part comprises an active grinding roller (16) and a driven grinding roller (17); the active grinding roller (16) is connected to a double-output shaft motor, and the output shaft at the other end thereof is sleeved with a driving gear (18), which meshes with a driven gear (19), and the driven gear (19) is sleeved on the driven grinding roller (17). When the double-output shaft motor is started, the master and slave gears mesh so that the active grinding roller (16) and the driven grinding roller (17) rotate relative to each other for grinding.

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