Preparation method of cement grinding aid for oil field

Abstract

The invention relates to the technical field of cement grinding aid preparation, in particular to a preparation method of a cement grinding aid for an oil field. Comprising a ball mill, a driving mechanism and a material turning and grinding mechanism, a feeding spiral conveyor and a discharging spiral conveyor are fixedly installed on the two sides of the surface of the ball mill, the driving mechanism comprises a driving motor, a driving gear is meshed with the surface of a rotating gear and fixedly installed on one side of the surface of the ball mill, and the material turning and grinding mechanism comprises a material turning assembly and a grinding assembly. The material turning assembly comprises material turning plates, the material turning plates are arranged on the periphery in the ball mill and rotate in the ball mill, the grinding assembly comprises grinding steel balls, and the grinding steel balls are fixedly installed on the periphery of the inner wall of the ball mill and rotate synchronously with the ball mill. The collision between the cement grinding aid block and the grinding steel balls is more directional and initiative, the collision frequency and the collision strength between the cement grinding aid block and the grinding steel balls are increased, and the crushing efficiency of the cement grinding aid block is improved.

Description

Technical Field

[0001] The invention relates to the technical field of cement grinding aid preparation, in particular to a method for preparing a cement grinding aid for oil fields. Background Art

[0002] Cement grinding aid is a chemical additive that improves the grinding effect and performance of cement. It can significantly increase the hourly output of cement, the strength of cement at all ages, and improve its fluidity. Cement grinding aid can significantly reduce the electrostatic adsorption ball phenomenon formed during the grinding process, and can reduce the re-agglomeration tendency of ultrafine particles formed during the grinding process. Cement grinding aid can also significantly improve cement fluidity, improve the grinding effect of the mill and the powder selection efficiency of the powder selector, thereby reducing grinding energy consumption.

[0003] At present, the existing preparation method of cement grinding aid for oil field usually adopts ball mill to grind and crush cement grinding aid block. The processing method is to rotate the ball mill at high speed so that the grinding steel balls arranged inside the ball mill roll inside the ball mill and collide with the cement grinding aid block to grind and crush the cement grinding aid block into particles. However, since the grinding steel balls roll inside the ball mill along with the rotation of the ball mill, the grinding steel balls cannot be controlled. Long-term operation will cause wear problems inside the ball mill. Moreover, the cement grinding aid block is only ground and crushed by the grinding steel balls. When new cement grinding aid blocks are transmitted to the inside of the ball mill, the cement grinding aid blocks piled up on the upper side are blocked by the cement grinding aid blocks piled up below and cannot contact with the surface of the grinding steel balls, resulting in insufficient effect of grinding and crushing the cement grinding aid blocks, thereby reducing the work efficiency of preparing cement grinding aid.

[0004] Therefore, a method for preparing a cement grinding aid for oil fields is urgently needed to solve the problems of the prior art. Summary of the invention

[0005] The object of the present invention is to provide a method for preparing a cement grinding aid for oil fields to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides a method for preparing a cement grinding aid for oil fields, comprising the following steps:

[0007] S1, pour cement grinding aid blocks from the feed bin, and transfer the cement grinding aid blocks to the inside of the ball mill through the feed screw conveyor;

[0008] S2, the driving motor runs, so that the driving shaft drives the rotating gear, and through the gear meshing, the rotating gear drives the driving gear to operate, and synchronously drives the ball mill to rotate as a whole;

[0009] S3, the cement grinding aid block rotates inside the ball mill, one end of the rotating rod is fixedly connected to the feed screw conveyor, so that the rotating rod rotates at the center position inside the ball mill, and at the same time drives the turning plate to rotate inside the ball mill, so that the cement grinding aid block turns over inside the ball mill, and contacts and collides with the surface of the grinding steel balls arranged around the inner wall of the ball mill, and the cleaning brush arranged can clean the surface of the grinding steel balls;

[0010] S4, the turning plate turns the cement grinding aid block inside the ball mill, contacts, collides and grinds with the grinding steel balls, grinds the cement grinding aid block into cement grinding aid powder, and finally leads it out through the discharging screw conveyor and outputs it from the discharging bin;

[0011] Among them, the preparation equipment used in this method includes a ball mill, a driving mechanism and a turning and grinding mechanism. A feed screw conveyor and a discharge screw conveyor are fixedly installed on both sides of the surface of the ball mill. The driving mechanism includes a driving motor. A driving shaft is fixedly connected to one end of the driving motor. A rotating gear is fixedly connected to one end of the driving shaft. The surface of the rotating gear is meshed with a driving gear, and the driving gear is fixedly installed on one side of the surface of the ball mill. The turning and grinding mechanism includes a turning assembly and a grinding assembly. The turning assembly includes a turning plate. The turning plate is arranged around the inside of the ball mill and rotates inside the ball mill. The grinding assembly includes grinding steel balls. The grinding steel balls are fixedly installed around the inner wall of the ball mill and rotate synchronously with the ball mill.

[0012] As a further improvement of the present technical solution, a base is fixedly installed at the bottom of the ball mill, a feed bin is arranged above the feed screw conveyor, a discharge bin is arranged below the discharge screw conveyor, and feed ports are opened on both sides of the surface of the ball mill, and the feed ports are connected with the feed screw conveyor and the discharge screw conveyor respectively.

[0013] As a further improvement of the technical solution, the feed screw conveyor and the discharge screw conveyor are symmetrically distributed on both sides of the ball mill surface in a staggered manner, and the height of the feed screw conveyor is higher than that of the discharge screw conveyor.

[0014] As a further improvement of the present technical solution, a rotating rod is fixedly connected to one side of the surface of the feed screw conveyor, a sleeve ring is fixedly connected to the surface of the rotating rod, a connecting rod is fixedly connected to the surface of the sleeve ring, a material shifting plate is fixedly connected to one side of the surface of the connecting rod, a bearing is fixedly connected to one side of the surface of the rotating rod, a sleeve rod is fixedly connected to one side of the surface of the bearing, a fixing part is fixedly connected to the surface of the sleeve rod, connecting parts are fixedly connected to both sides of the surface of the fixing part, a material flipping plate is fixedly connected to one side of the surface of the connecting part, a linkage shaft is fixedly connected to one side of the surface of the sleeve rod, a lining plate is fixedly installed around the inner wall of the ball mill, a fixing plate is fixedly installed around the surface of the lining plate, and a grinding steel ball is fixedly installed above the fixing plate.

[0015] As a further improvement of the technical solution, a support rod is fixedly connected to one side of the surface of the flipping plate, a cleaning brush is fixedly connected below the support rod, and the bottom of the cleaning brush is in rotational contact with the surface of the grinding steel ball.

[0016] As a further improvement of this technical solution, the sleeve rod is evenly distributed in the center position inside the ball mill. The sleeve rod rotates synchronously through the bearing and the rotating rod, and drives the flipping plate to rotate on both sides of the surface of the grinding steel balls, and the flipping plate and the liner surface are in rotational contact.

[0017] As a further improvement of the technical solution, the material removal plate is distributed obliquely around one side of the surface of the feed screw conveyor, and as the rotating rod rotates on one side of the surface of the feed screw conveyor, the cement grinding aid blocks introduced on one side of the surface of the feed screw conveyor are transferred to the inside of the ball mill.

[0018] As a further improvement of the technical solution, the grinding steel balls are evenly distributed around the surface of the lining plate and correspond to the sleeve rod, so that the cleaning brush and the surface of the grinding steel balls rotate correspondingly.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The preparation method of cement grinding aid for oil field comprises the following steps: the cement grinding aid block is crushed and transmitted to the inside of the ball mill through a feeding screw conveyor; at the same time, the ball mill rotates by meshing a rotating gear and a driving gear, so that the grinding steel balls collide with the crushed cement grinding aid block; the rotating rod rotates synchronously with the feeding screw conveyor, and drives the turning plate to turn over the cement grinding aid block accumulated in the ball mill, and turns and collides with the surface of the grinding steel balls up and down, so that the collision between the cement grinding aid block and the grinding steel balls is more directional and active, the collision frequency and collision strength between the cement grinding aid block and the grinding steel balls are increased, and the crushing efficiency of the cement grinding aid block is improved.

[0021] 2. The preparation method of cement grinding aid for oil field, after the grinding steel balls collide and crush the cement grinding blocks, there will be residual cement grinding block debris accumulated in the gaps between the grinding steel balls, and the cleaning brush provided can clean out the cement grinding block debris remaining in the gaps between the grinding steel balls, thereby reducing the accumulation of cement grinding block debris inside the ball mill. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the connection structure of the ball mill, the feeding screw conveyor and the discharging screw conveyor of the present invention;

[0023] Figure 2 It is a schematic diagram of the connection structure of the ball mill and the driving mechanism of the present invention;

[0024] Figure 3 It is a structural schematic diagram of the material turning and grinding mechanism of the present invention;

[0025] Figure 4 It is a schematic diagram of the connection structure of the liner plate and the grinding steel ball of the present invention;

[0026] Figure 5 It is a schematic diagram of the connection structure of the feed port, the lining plate and the material diverting plate of the present invention;

[0027] Figure 6 for Figure 5 Schematic diagram of the enlarged structure at point A in the middle.

[0028] The meaning of each number in the figure is:

[0029] 100, ball mill; 101, base; 102, feed screw conveyor; 103, feed bin; 104, discharge screw conveyor; 105, discharge bin; 106, feed port;

[0030] 200, driving mechanism; 201, driving motor; 202, rotating gear; 203, driving gear;

[0031] 300, material turning and grinding mechanism; 301, lining plate; 302, rotating rod; 303, bearing; 304, sleeve rod; 305, linkage shaft; 306, fixed plate; 307, grinding steel ball; 308, sleeve ring; 309, connecting rod; 310, material shifting plate; 311, fixing part; 312, connecting part; 313, material turning plate; 314, supporting rod; 315, cleaning brush. DETAILED DESCRIPTION

[0032] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figure 1 - Figure 6 As shown, the purpose of this embodiment is to provide a method for preparing a cement grinding aid for oil fields, comprising the following steps:

[0034] S1, pouring cement grinding aid blocks from the feed bin 103, and transferring the cement grinding aid blocks to the inside of the ball mill 100 through the feed screw conveyor 102;

[0035] S2, the driving motor 201 is running, so that the driving shaft drives the rotating gear 202, and through the gear meshing, the rotating gear 202 drives the driving gear 203 to operate, and synchronously drives the ball mill 100 to rotate as a whole;

[0036] S3, the cement grinding aid block rotates inside the ball mill 100, and one end of the rotating rod 302 is fixedly connected to the feeding screw conveyor 102, so that the rotating rod 302 rotates at the center position inside the ball mill 100, and at the same time drives the turning plate 313 to rotate inside the ball mill 100, so that the cement grinding aid block turns over inside the ball mill 100, and contacts and collides with the surface of the grinding steel balls 307 arranged around the inner wall of the ball mill 100, and the cleaning brush 315 arranged can clean the surface of the grinding steel balls 307;

[0037] S4, the turning plate 313 turns the cement grinding aid block inside the ball mill 100, contacts, collides and grinds with the grinding steel balls 307, grinds the cement grinding aid block into cement grinding aid powder, and finally leads it out through the discharge screw conveyor 104 and outputs it from the discharge bin 105;

[0038] Wherein, the preparation equipment used in the present method includes a ball mill 100, a driving mechanism 200 and a turning and grinding mechanism 300, a feeding screw conveyor 102 and a discharging screw conveyor 104 are fixedly installed on both sides of the surface of the ball mill 100, the driving mechanism 200 includes a driving motor 201, one end of the driving motor 201 is fixedly connected to a driving shaft, one end of the driving shaft is fixedly connected to a rotating gear 202, the surface of the rotating gear 202 is meshed with a driving gear 203, and the driving gear 203 is fixedly installed on one side of the surface of the ball mill 100, the turning and grinding mechanism 300 includes a turning component and a grinding component, the turning component includes a turning plate 313, the turning plate 313 is arranged around the inside of the ball mill 100 and rotates inside the ball mill 100, and the grinding component includes grinding steel balls 307, the grinding steel balls 307 are fixedly installed around the inner wall of the ball mill 100, and rotate synchronously with the ball mill 100;

[0039] It should be noted that the grinding steel balls 307 are fixedly installed around the inside of the ball mill 100, and the cement grinding blocks are turned over and activated inside the ball mill 100 by using the turning plate 313, and collide with the surface of the grinding steel balls 307 to grind and crush the cement grinding blocks;

[0040] The cement grinding blocks are crushed and transmitted to the inside of the ball mill 100 through the feeding screw conveyor 102. At the same time, the ball mill 100 rotates by meshing the rotating gear 202 and the driving gear 203, so that the grinding steel balls 307 collide with the crushed cement grinding blocks. The rotating rod 302 rotates synchronously with the feeding screw conveyor 102, and drives the turning plate 313 to flip the cement grinding blocks accumulated inside the ball mill 100, and collide with the surface of the grinding steel balls 307 upside down, so that the collision between the cement grinding blocks and the grinding steel balls 307 is more directional and active, increasing the collision frequency and collision force between the cement grinding blocks and the grinding steel balls 307, and improving the crushing efficiency of the cement grinding blocks.

[0041] Therefore, based on the above structure, combined with Figure 1-Figure 2 As shown, the structure of the ball mill 100 is further disclosed. A base 101 is fixedly installed at the bottom of the ball mill 100, a feed bin 103 is arranged above the feed screw conveyor 102, and a discharge bin 105 is arranged below the discharge screw conveyor 104. Feed ports 106 are opened on both sides of the surface of the ball mill 100, and the feed ports 106 are connected to the feed screw conveyor 102 and the discharge screw conveyor 104 correspondingly;

[0042] Furthermore, the cement grinding aid blocks are transferred to the feed screw conveyor 102 through the feed bin 103, and the cement grinding aid blocks are initially crushed and transferred to the ball mill 100 by the feed screw conveyor 102, and the cement grinding aid blocks are crushed and ground, and finally conveyed out from the discharge screw conveyor 104, and finally discharged from the discharge bin 105;

[0043] It should be noted that: after the cement grinding aid blocks are transferred to the interior of the ball mill 100 through the feed screw conveyor 102, the newly added cement grinding aid blocks will continue to accumulate to form a certain height difference. Due to the fluidity of the material itself, the cement grinding aid blocks accumulated at a higher position will tend to flow to a lower position. Inside the ball mill 100, as the cement grinding aid blocks are ground, their particle size becomes smaller and their fluidity increases. Under the action of their own gravity and fluidity, the cement grinding aid blocks will also move from the feed end with more accumulation to the discharge end with relatively less accumulation. The height of the discharge screw conveyor 104 is lower than that of the feed screw conveyor 102, which is convenient for the cement grinding aid blocks to be crushed and ground inside the ball mill 100. The turning component pushes the crushed and ground cement grinding aid blocks to the position of the discharge screw conveyor 104, making the discharge more convenient and quick.

[0044] Therefore, based on the above structure, combined with Figure 3-Figure 5 As shown, the structure of the material turning component is further disclosed, a rotating rod 302 is fixedly connected to one side of the surface of the feed screw conveyor 102, a sleeve ring 308 is fixedly connected to the surface of the rotating rod 302, a connecting rod 309 is fixedly connected to the surface of the sleeve ring 308, a material turning plate 310 is fixedly connected to one side of the surface of the connecting rod 309, a bearing 303 is fixedly connected to one side of the surface of the rotating rod 302, a sleeve rod 304 is fixedly connected to one side of the surface of the bearing 303, a fixing member 311 is fixedly connected to the surface of the sleeve rod 304, connecting members 312 are fixedly connected to both sides of the surface of the fixing member 311, a material turning plate 313 is fixedly connected to one side of the surface of the connecting member 312, a linkage shaft 305 is fixedly connected to one side of the surface of the sleeve rod 304, a lining plate 301 is fixedly installed around the inner wall of the ball mill 100, a fixing plate 306 is fixedly installed around the surface of the lining plate 301, and a grinding steel ball 307 is fixedly installed above the fixing plate 306;

[0045] Furthermore, the cement grinding aid blocks are crushed and pushed into the ball mill 100 by rotating the feeding screw conveyor 102, and the rotating rod 302 is driven to rotate synchronously, and the sleeve rod 304 is driven to rotate, so that the turning plate 313 rotates around the surface of the sleeve rod 304. Since one side of the turning plate 313 surface is in contact with the surface of the liner 301, the cement grinding aid blocks accumulated on the surface of the liner 301 can be turned over, so that the cement grinding aid blocks are always kept active in the ball mill 100. When the cement grinding aid blocks are turned over in the ball mill 100, the fallen cement grinding aid blocks can collide with the surface of the grinding steel balls 307. At the same time, the grinding steel balls 307 also rotate at a high speed with the ball mill 100. The centrifugal force generated between the rotating rod 302 and the ball mill 100 can make the cement grinding aid blocks contact and collide with the grinding steel balls 307 for a long time in the ball mill 100, so as to effectively improve the efficiency of crushing and grinding the cement grinding aid blocks.

[0046] The set material-shifting plate 310 can shift the cement grinding aid blocks introduced into the feed port 106 opened at one end of the feed screw conveyor 102. The material-shifting plate 310 rotates around the surface of the rotating rod 302 under the action of the collar 308, and effectively transports the cement grinding aid blocks from the feed port 106 to the inside of the ball mill 100 under the action of centrifugal force, and introduces the cement grinding aid blocks into the ball mill 100 in a dispersed form.

[0047] It should be noted that the turning plates 313 are symmetrically distributed around the outer surface of the rotating rod 302, and rotate inside the ball mill 100 along with the rotating rod 302. One side of the turning plate 313 surface is in contact with the surface of the lining plate 301, which has the effect of flipping the cement grinding aid block on the surface of the lining plate 301, so that the cement grinding aid block can always remain active inside the ball mill 100.

[0048] Therefore, based on the above structure, combined with Figure 6 As shown, the structure of the grinding assembly is further disclosed, a support rod 314 is fixedly connected to one side of the surface of the flip plate 313, a cleaning brush 315 is fixedly connected below the support rod 314, and the bottom of the cleaning brush 315 is in rotational contact with the surface of the grinding steel ball 307;

[0049] Furthermore, the cement grinding aid block is transmitted to the inside of the ball mill 100, and as the ball mill 100 rotates, the cement grinding aid block is flipped inside the ball mill 100 by the flipping plate 313, so that when the cement grinding aid block flips and falls inside the ball mill 100, it collides with the surface of the grinding steel ball 307, thereby grinding and crushing the cement grinding aid block. At the same time, the cleaning brush 315 is fixedly installed on one side of the flipping plate 313, and also rotates inside the ball mill 100 with the rotating rod 302, and the bottom of the cleaning brush 315 is in contact with the top of the grinding steel ball 307, so that the cement grinding aid block debris remaining on the surface of the grinding steel ball 307 can be cleaned to prevent the cement grinding aid block debris from accumulating inside the grinding steel ball 307 and affecting the subsequent new round of grinding and crushing of the cement grinding aid block.

[0050] It should be noted that the grinding steel balls 307 are evenly distributed around the surface of the liner 301 and correspond to the position of the sleeve rod 304, so that the cleaning brush 315 and the grinding steel balls 307 can be in contact with each other. At the same time, the turning plates 313 are symmetrically distributed on both sides of the surface of the grinding steel balls 307, so that the cement grinding aid blocks are continuously turned over inside the ball mill 100 and collide with the surface of the grinding steel balls 307.

[0051] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for preparing a cement grinding aid for oil fields, characterized in that: The following steps are involved: S1, pouring cement grinding aid blocks from the feed bin (103), and conveying the cement grinding aid blocks to the inside of the ball mill (100) through the feed screw conveyor (102); S2, the driving motor (201) is running, so that the driving shaft drives the rotating gear (202), and through the meshing of the gears, the rotating gear (202) drives the driving gear (203) to operate, and synchronously drives the ball mill (100) to rotate as a whole; S3, the cement grinding aid block rotates inside the ball mill (100), one end of the rotating rod (302) is fixedly connected to the feed screw conveyor (102), so that the rotating rod (302) rotates at the center position inside the ball mill (100), and at the same time drives the turning plate (313) to rotate inside the ball mill (100), so that the cement grinding aid block turns over inside the ball mill (100) and contacts and collides with the surface of the grinding steel balls (307) arranged around the inner wall of the ball mill (100), and the cleaning brush (315) arranged can clean the surface of the grinding steel balls (307); S4, the turning plate (313) turns the cement grinding aid block inside the ball mill (100), so that the cement grinding aid block contacts, collides and grinds with the grinding steel balls (307), and the cement grinding aid block is ground into cement grinding aid powder, which is finally led out through the discharging screw conveyor (104) and discharged from the discharging bin (105); The preparation equipment used in the method comprises a ball mill (100), a driving mechanism (200) and a material turning and grinding mechanism (300), wherein a feeding screw conveyor (102) and a discharging screw conveyor (104) are fixedly installed on both sides of the surface of the ball mill (100), and the driving mechanism (200) comprises a driving motor (201), one end of the driving motor (201) is fixedly connected to a driving shaft, and one end of the driving shaft is fixedly connected to a rotating gear (202), and the surface of the rotating gear (202) is meshed with a driving gear (2 03), the driving gear (203) is fixedly mounted on one side of the surface of the ball mill (100), the turning and grinding mechanism (300) includes a turning assembly and a grinding assembly, the turning assembly includes a turning plate (313), the turning plate (313) is arranged around the inside of the ball mill (100) and rotates inside the ball mill (100), the grinding assembly includes grinding steel balls (307), the grinding steel balls (307) are fixedly mounted around the inner wall of the ball mill (100) and rotate synchronously with the ball mill (100).

2. The method for preparing a cement grinding aid for oil fields according to claim 1, wherein: A base (101) is fixedly installed at the bottom of the ball mill (100); a feed bin (103) is arranged above the feed screw conveyor (102); a discharge bin (105) is arranged below the discharge screw conveyor (104); feed ports (106) are provided on both sides of the surface of the ball mill (100); and the feed ports (106) are correspondingly connected to the feed screw conveyor (102) and the discharge screw conveyor (104).

3. The method for preparing a cement grinding aid for oil fields according to claim 2, wherein: The feeding screw conveyor (102) and the discharging screw conveyor (104) are symmetrically distributed on both sides of the surface of the ball mill (100) in a staggered manner, and the height of the feeding screw conveyor (102) is higher than the height of the discharging screw conveyor (104).

4. The method for preparing a cement grinding aid for oil fields according to claim 3, characterized in that: A rotating rod (302) is fixedly connected to one side of the surface of the feed screw conveyor (102), a sleeve ring (308) is fixedly connected to the surface of the rotating rod (302) around the periphery, a connecting rod (309) is fixedly connected to the surface of the sleeve ring (308) around the periphery, a material-prying plate (310) is fixedly connected to one side of the surface of the connecting rod (309), a bearing (303) is fixedly connected to one side of the surface of the rotating rod (302), a sleeve rod (304) is fixedly connected to the surface of the sleeve rod (304) around the periphery, and a material-prying plate (310) is fixedly connected to one side of the surface of the rotating rod (302). A fixing piece (311) is fixedly connected around the inner wall of the ball mill (100), connecting pieces (312) are fixedly connected on both sides of the surface of the fixing piece (311), the turning plate (313) is fixedly connected to one side of the surface of the connecting piece (312), a linkage shaft (305) is fixedly connected to one side of the surface of the sleeve rod (304), a lining plate (301) is fixedly installed around the inner wall of the ball mill (100), a fixing plate (306) is fixedly installed around the surface of the lining plate (301), and the grinding steel ball (307) is fixedly installed above the fixing plate (306).

5. The method for preparing a cement grinding aid for oil fields according to claim 4, characterized in that: A support rod (314) is fixedly connected to one side of the surface of the turning plate (313), a cleaning brush (315) is fixedly connected below the support rod (314), and the bottom of the cleaning brush (315) is in rotational contact with the surface of the grinding steel ball (307).

6. The method for preparing a cement grinding aid for oil fields according to claim 4, characterized in that: The sleeve rod (304) is evenly distributed at the center position inside the ball mill (100), and the sleeve rod (304) rotates synchronously through the bearing (303) and the rotating rod (302), and drives the turning plate (313) to rotate on both sides of the surface of the grinding steel ball (307), and the turning plate (313) and the lining plate (301) are in rotational contact.

7. The method for preparing a cement grinding aid for oil fields according to claim 4, characterized in that: The material shifting plates (310) are distributed in an inclined manner around one side of the surface of the feed screw conveyor (102), and as the rotating rod (302) rotates on one side of the surface of the feed screw conveyor (102), the cement grinding aid blocks introduced from one side of the surface of the feed screw conveyor (102) are transferred to the interior of the ball mill (100).

8. The method for preparing a cement grinding aid for oil fields according to claim 5, characterized in that: The grinding steel balls (307) are evenly distributed around the surface of the lining plate (301) and correspond to the sleeve rod (304), so that the cleaning brush (315) and the surface of the grinding steel balls (307) rotate in correspondence.

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