A high-strength fracturing sand preparation device and method for oil extraction

Abstract

The application relates to the field of fracturing sand processing equipment, in particular to a high-strength fracturing sand preparation device and method for oil extraction. The high-strength fracturing sand preparation device comprises a shell, a scrubbing mechanism, rotating mechanisms, a transfer mechanism and a controller. The driving mechanisms are symmetrically distributed at the two ends of the shell and are used for driving the shell to rotate. The scrubbing mechanism is horizontally installed on the inner side of the shell. The transfer mechanism is horizontally placed on the ground and is located at the bottom of the shell. The controller is installed on the outer side of the shell. The scrubbing mechanism, the two rotating mechanisms and the transfer mechanism are electrically connected with the controller. The scrubbing mechanism is used for cleaning the fracturing sand. The transfer mechanism is used for drying and transferring the fracturing sand. The scrubbing mechanism, the stirring and drying process of the transfer mechanism can realize the rapid preparation of the fracturing sand. A preparation method is designed according to the equipment.

Description

Technical Field

[0001] This invention relates to the field of fracturing sand processing equipment, and in particular to a device and method for preparing high-strength fracturing sand for oil production. Background Technology

[0002] Fracturing sand, a type of high-purity quartz sand, is widely used as an excellent additive in oil and gas extraction operations. However, natural quartz sand also has some drawbacks, such as high impurity content and uneven particle size. Therefore, it is necessary to clean and dehydrate natural quartz sand to improve its quality and meet the broad market demand. Traditional fracturing sand processing equipment generally uses auger blades and drive shafts to agitate and clean the fracturing sand. However, this cleaning method is not effective enough in terms of agitation and cannot completely remove the mud and impurities, resulting in poor cleaning effect and low cleaning efficiency. At the same time, a large amount of dirt easily accumulates on the inner wall of the auger blades, which can easily contaminate the fracturing sand. Furthermore, it is inconvenient to clean and maintain the inner wall of the auger blades during equipment maintenance. Therefore, it is necessary to design a fracturing sand preparation device that can be efficiently cleaned and conveniently transported. Summary of the Invention

[0003] This invention provides a device and method for preparing high-strength fracturing sand for oil production, in order to solve the technical problems of incomplete fracturing sand cleaning effect and low cleaning efficiency in the prior art.

[0004] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0005] This invention provides a device for preparing high-strength fracturing sand for oil production, comprising a shell, a washing mechanism, a rotating mechanism, a transfer mechanism, and a controller;

[0006] Two rotating mechanisms are symmetrically distributed at both ends of the shell to drive the shell to rotate, which can flip the shell to achieve the purpose of dumping sewage and crushing sand;

[0007] The scrubbing mechanism is installed horizontally inside the shell, which enables more thorough agitation and cleaning of the fracturing sand within the shell space;

[0008] The transfer mechanism is placed horizontally on the ground and located at the bottom of the shell. It is used to receive the fracturing sand poured out of the shell and to complete the mixing, spreading, drying and transfer of the fracturing sand. The controller is installed on the outer side of the shell. The scrubbing mechanism, the two rotating mechanisms and the transfer mechanism are all electrically connected to the controller.

[0009] Furthermore, the scrubbing mechanism includes a spiral shaft, two pairs of fan blades, two first cylinders, two second cylinders, and two drive assemblies. The fan blades are arranged obliquely, and both pairs of fan blades are threaded onto the outer ring of the spiral shaft. The two drive assemblies are located between the two pairs of fan blades and at the root of the fan blades. The two first cylinders and two second cylinders are respectively located between the two pairs of fan blades. One end of each of the first and second cylinders is fixed to two fan blades of the same pair, and the other ends of the first and second cylinders slide and are sealed together. The beneficial effect is that, through the sealed connection, during the agitation process, sewage is effectively prevented from entering the drive assemblies, thus avoiding damage to the internal drive assembly parts.

[0010] Furthermore, the drive assembly includes two rotating parts, a fixed ring, and several bidirectional electric telescopic rods. The several bidirectional electric telescopic rods are all fixedly installed between two blades of the same pair through the fixed ring. One end of each of the two rotating parts is fixed to one of the two blades of the same pair, and the other end is fixedly connected to the two movable ends of the bidirectional electric telescopic rods. The two movable ends of the bidirectional electric telescopic rods abut against and are fixed to the two rotating parts. Thus, relative rotation and displacement can be achieved between the same pair and between two pairs of blades, enabling more thorough and dead-angle-free mixing of fracturing sand.

[0011] Furthermore, the rotating mechanism includes two servo motors, two driving wheels, two driven wheels, and a rotating shaft. The driving wheels are mounted on the servo motors and mesh with the driven wheels. The driven wheels are fixedly mounted on the rotating shaft, which is fixedly connected to the housing. This provides a driving force for bidirectional flipping of the housing. After the fracturing sand is cleaned, it is rotated counterclockwise by a certain angle to pour out the wastewater, and then rotated clockwise by a certain angle to flip and pour out the fracturing sand.

[0012] Furthermore, the fracturing sand preparation device also includes two first supports. The shell is erected on the ground by the two first supports, and two rotating mechanisms are fixedly installed on the first supports respectively. The two rotating mechanisms are rotatably connected to the shell.

[0013] Furthermore, the transfer mechanism includes a second support, a sliding assembly, a conveyor belt, several stirring shafts, several connecting shafts, and several gear assemblies. The two ends of the stirring shafts are rotatably connected to the sliding assembly via several gear assemblies. The sliding assembly includes two slide rails and several electric sliders. The electric sliders are divided into two groups of equal numbers and are slidably connected to the two slide rails. The two slide rails are fixed to the inner sides of the second support on both sides. The two ends of the connecting shafts are detachably connected to the second support. The conveyor belt is wound around the outer ring of the several connecting shafts. Thus, the stirring shafts can move and stir above the conveyor belt to spread and level the fracturing sand.

[0014] Furthermore, the gear assembly includes a connecting block, a gear, and a rack. The gear and rack mesh with each other. The gear is mounted on the stirring shaft, and the rack is fixed to the connecting block by bolts. The connecting block is fixed to the inner side of the second brackets on both sides by bolts. The stirring shaft is driven to rotate and stir by an external drive.

[0015] Furthermore, the fracturing sand preparation device also includes a filter plate and a locking mechanism. The beneficial effect is that the filter plate covers the shell and is hinged to the shell on one side through the locking mechanism, while the other side is fixedly connected to the right side of the shell through the locking mechanism. This can prevent the fracturing sand from leaking out during the stirring and cleaning process and during the pouring of sewage.

[0016] Another aspect of the present invention provides a method for preparing high-strength fracturing sand for oil production, characterized in that fracturing sand is prepared using the above-mentioned fracturing sand preparation device, which specifically includes the following steps;

[0017] Step S10: Place the fracturing sand to be cleaned into the shell;

[0018] Step S20: Cover and secure the filter plate;

[0019] Step S30: Start the scrubbing mechanism to clean the fracturing sand;

[0020] Step S40: After cleaning is completed, start the rotating mechanism. The rotating mechanism rotates the shell counterclockwise. After the shell rotates to the specified angle, pour out the sewage inside the shell. Then, rotate the shell clockwise through the rotating mechanism to return the shell to the correct position. Open the filter plate. The rotating mechanism rotates the shell clockwise so that the fracturing sand inside the shell is poured into the conveyor belt of the transfer mechanism under the action of gravity.

[0021] Step S50: Start the transfer mechanism. Under the stirring of the mixing shaft, the fracturing sand is evenly spread on the conveyor belt.

[0022] Step S60: After drying to a certain extent, the conveyor belt will transport the fracturing sand to the designated location.

[0023] Furthermore, step S30 specifically includes the following steps:

[0024] Step S31: The bidirectional electric telescopic rod retracts, the fan blades rotate and stir the fracturing sand, the distance between the two fan blades in the same pair of fan blades is brought closer, the distance between the two pairs of fan blades is increased, and the stirring range is expanded.

[0025] Step S32: After the bidirectional electric telescopic rod retracts to the set state, the bidirectional electric telescopic rod extends, the fan blades rotate in the opposite direction, stirring the fracturing sand, increasing the distance between the fan blades in the same group, and bringing the distance between the two pairs of fan blades closer, thus expanding the stirring range.

[0026] Step S33: Repeat steps S31 to S32 until the scrubbing time reaches the set value, the stirring and cleaning is completed, and the stirring stops.

[0027] The beneficial effects of this invention are:

[0028] 1. This invention achieves stirring and cleaning by the relative rotation and displacement of the fan blades in the scrubbing mechanism, resulting in more thorough stirring and improved cleaning efficiency and effect of fracturing sand.

[0029] 2. The rotating mechanism in this invention enables the shell to be flipped, allowing the fracturing sand to be poured onto the transfer mechanism under its own gravity, resulting in more thorough pouring and preventing fracturing sand residue or incomplete transfer.

[0030] 3. The present invention is equipped with a stirring shaft above the conveyor belt, which can stir during the transfer process to achieve the purpose of spreading the fracturing sand evenly, making the fracturing sand spread more evenly and drying faster and more thoroughly. Attached Figure Description

[0031] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0032] Figure 2 This is a three-dimensional structural diagram of the scrubbing mechanism;

[0033] Figure 3 for Figure 2 A magnified view of part A;

[0034] Figure 4 This is a three-dimensional schematic diagram of the transfer mechanism;

[0035] Figure 5 This is a three-dimensional structural diagram of the drive mechanism;

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Filter plate;

[0038] 2. Shell;

[0039] 3. Scrubbing mechanism; 31. Spiral shaft; 33. Rotating component; 331. Outer ring; 332. Rolling element; 333. Inner ring; 334. Through hole; 34. First cylinder; 35. Second cylinder; 36. Bidirectional electric telescopic rod; 37. Fixing ring;

[0040] 4. First support;

[0041] 5. Drive mechanism; 51. Servo motor; 52. Drive wheel; 53. Driven wheel; 54. Rotating shaft;

[0042] 6. Transfer mechanism; 61. Second support; 62. Sliding assembly; 621. Slide rail; 662. Electric slider; 63. Conveyor belt; 64. Stirring shaft; 65. Connecting shaft; 66. Gear assembly; 661. Connecting block; 662. Rack; 663. Gear. Detailed Implementation

[0043] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. In the description of the present invention, the relevant orientations or positional relationships are based on... Figure 1 The directions or positional relationships shown, where "up" and "down" refer to... Figure 1 The up and down directions, with Figure 1 For example, "up" means perpendicular to the paper's surface pointing upwards, "down" means perpendicular to the paper's surface pointing downwards, "left" means perpendicular to the paper's surface pointing to the left, "right" means perpendicular to the paper's surface pointing to the right, "front" means perpendicular to the paper's surface pointing inwards, and "back" means perpendicular to the paper's surface pointing outwards. The left-right direction is horizontal, and the up-down direction is vertical. It should be understood that these directional terms are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] Furthermore, the terms "first," "second," etc., used in this invention are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number or order of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0046] First embodiment:

[0047] Reference Figure 1 The first embodiment of this application provides a high-strength fracturing sand preparation device for oil production, including a shell 2, a scrubbing mechanism 3, a driving mechanism 5, a transfer mechanism 6, and a controller;

[0048] Two drive mechanisms 5 are symmetrically distributed at both ends of the housing 2, used to drive the housing 2 to rotate via gears, enabling the housing 2 to be flipped over to dump sewage and fracturing sand. The scrubbing mechanism 3 is horizontally installed inside the housing 2 and fixedly connected to the housing 2. To ensure that the fracturing sand can be more thoroughly stirred and cleaned within the space of the housing 2, the lower end of the housing 2 is shaped like an arc. On the one hand, this allows it to fit the shape of the scrubbing mechanism 3, reducing dead angles in stirring and improving the stirring and cleaning effect. On the other hand, it makes the fracturing sand distribution more concentrated and the cleaning more thorough. The transfer mechanism 6 is placed horizontally on the ground and located at the bottom of the housing 2 to receive the fracturing sand poured out by the housing 2, and to complete the stirring, spreading, drying and transfer of the fracturing sand. The controller is installed on the outer surface of the housing 2, and the scrubbing mechanism 3, the two rotating mechanisms 5, and the transfer mechanism 6 are all electrically connected to the controller.

[0049] Reference Figure 2 In this embodiment, the scrubbing mechanism 3 includes a spiral shaft 31, two pairs of fan blades 32, two first cylinders 34, two second cylinders 35, and two drive components. The spiral shaft 31 has a spiral arc groove on its surface. The fan blades 32 are obliquely arranged, and the inclination angle of the fan blades 32 is preferably between 25 degrees and 35 degrees. The blades are circumferentially distributed on the base of the fan blades 32. The base has the same spiral arc groove. The two pairs of fan blades 32 are rotatably connected to the spiral shaft 31 and move by rotating steel balls on the spiral shaft 31. The steel balls are rotatably connected to the fan blade 32 base and the spiral shaft 31. The spiral groove is formed; two drive components are arranged between two pairs of fan blades 32 and located at the root of the fan blades 32. Two first cylinders 34 and two second cylinders 35 are respectively arranged between two pairs of fan blades 32. One end of the first cylinder 34 and the second cylinder 35 are respectively fixed on the base of the two fan blades 32 of the same pair. The other end of the first cylinder 34 and the other end of the second cylinder 35 are slidably and sealed together by a sealing ring to prevent sewage from entering. The number of fan blades 32 includes, but is not limited to, two pairs. The number of drive components, first cylinders 34 and second cylinders 35 also varies accordingly.

[0050] Reference Figure 2 and Figure 3In this embodiment, the drive assembly includes two rotating parts 33, a fixed ring 36, and several bidirectional electric telescopic rods 37. The several bidirectional electric telescopic rods 37 are all fixedly installed between two fan blades 32 of the same pair through the fixed ring 36. One side of the fixed ring 36 is fixedly connected to the bidirectional electric telescopic rod 37, and the other side is fixedly installed on the spiral shaft 31. The rotating parts 33 include: an outer ring 331, a rolling element 332, an inner ring 333, and a through hole 334. The outer ring 331 is provided with the through hole 334. The outer rings 331 of the two rotating parts 33 are respectively fixed on the bases of two fan blades 32 of the pair. The inner rings 333 are respectively fixedly connected to the two movable ends of the bidirectional electric telescopic rods 37. The two movable ends of the bidirectional electric telescopic rods 37 abut against the two inner rings 333 through the through holes 334. The inner rings 333 rotate within the outer rings 331 through the rolling element 332.

[0051] Reference Figure 4 In this embodiment, the drive mechanism 5 includes two servo motors 51, two drive wheels 52, two driven wheels 53, and two rotating shafts 54. The servo motors 51 can control the rotation angle and realize automatic switching between forward and reverse rotation. High-power servo motors are preferred. The drive wheels 52 are fixedly connected to the servo motors 51 and mesh with the driven wheels 53. The driven wheels 53 are fixedly mounted on the rotating shafts 54. The rotating shafts 54 are fixedly connected to the housing 2. The servo motors 51 provide driving force and rotate the housing 2 through gear meshing.

[0052] The fracturing sand washing equipment also includes two first supports 4, which are symmetrically distributed on both sides of the shell 2. The shell 2 is rotatably connected to the first supports 4 at both ends through a rotating shaft 54 ​​and is erected on the ground. Two drive mechanisms 5 are respectively fixedly installed on the first supports 4 and are rotatably connected to the shell 2.

[0053] Reference Figure 5 In this embodiment, the transfer mechanism 6 includes several second supports 61, several sliding components 62, a conveyor belt 63, several stirring shafts 64, several connecting shafts 65, and several gear assemblies 66. The second supports 61 are fixedly installed on the ground. The two ends of the several stirring shafts 64 are rotatably connected to the sliding components 62 through several gear assemblies 66. The sliding components 62 include two slide rails 621 and several electric sliders 622. The several electric sliders 622 are divided into two groups of equal number and are slidably connected to the two slide rails 621 respectively. The two slide rails 621 are fixed to the inner sides of the two second supports 61 by bolts. The two ends of the connecting shafts 65 are rotatably connected to the second supports 61 respectively. The conveyor belt 63 is wound around the outer ring of the several connecting shafts 65. The rotation of the connecting shafts 65 drives the conveyor belt 63 to transport fracturing sand.

[0054] The gear assembly 66 includes a connecting block 661, a rack 662, and a gear 663. The rack 662 and the gear 663 mesh with each other. The rack 663 is fixed to the connecting block 661 by bolts. The connecting block 661 is fixed to the inner side of the second brackets 61 on both sides by bolts. The gear 662 is mounted on the stirring shaft 64.

[0055] The fracturing sand preparation device also includes a filter plate 1 and a locking mechanism. The filter plate 1 covers the housing 2 and is hinged to the housing 2 on one side through the locking mechanism, and fixedly connected to the right side of the housing 2 on the other side through the locking mechanism.

[0056] Second embodiment:

[0057] Another aspect of the present invention provides a method for preparing high-strength fracturing sand for oil production, which uses the above-mentioned fracturing sand preparation device to prepare fracturing sand, and specifically includes the following steps;

[0058] Step S10: Place the fracturing sand to be cleaned into the shell 2;

[0059] Step S20: Cover and secure filter plate 1;

[0060] Step S30: Start the scrubbing mechanism 3 to clean the fracturing sand;

[0061] Step S40: After cleaning is completed, start the rotating mechanism 5. Rotate the housing 2 counterclockwise. After the housing 2 is rotated to the specified angle, pour out the sewage inside the housing 2. After the sewage is poured out, rotate the rotating mechanism 5 clockwise to make the housing 2 return to the correct position. Open the filter plate 1. Rotate the rotating mechanism 5 clockwise to make the housing 2 flip over. The fracturing sand is poured into the conveyor belt 63 of the transfer mechanism 6 under the action of gravity.

[0062] Step S50: Start the transfer mechanism 6. The slider 622 moves on the slide rail 621, which drives the stirring shaft 64 to move laterally. Through the meshing of the gear 663 and the rack 662, the stirring shaft 64 can rotate while moving, so that the fracturing sand is evenly spread on the conveyor belt 63.

[0063] Step S60: After drying to a certain extent, the conveyor belt 63 transports the fracturing sand to the designated location.

[0064] Step S30 specifically includes the following steps:

[0065] Step S31: The bidirectional electric telescopic rod 37 retracts, the first cylinder 34 and the second cylinder 35 are compressed, the rotating part 33 drives the fan blade 32 to retract inward, the steel ball in the base of the fan blade 32 moves inward along the spiral arc groove on the spiral shaft 31, the rotation drives the fan blade 32 to rotate, stirring the fracturing sand, the rotation of the fan blade 32 drives the inner ring 333 to rotate in the outer ring 331, at the same time, through the retraction of the fan blade 32, the distance between the fan blades 32 in the same group is reduced, the distance between the two pairs of fan blades 32 is increased, and the stirring range is expanded;

[0066] Step S32: The bidirectional electric telescopic rod 37 extends, the first cylinder 34 and the second cylinder 35 are pulled apart, the rotating part 33 drives the fan blade 32 to expand outward, the steel ball in the base of the fan blade 32 moves outward along the spiral arc groove on the spiral shaft 31, the rotation drives the fan blade 32 to rotate, stirring the fracturing sand, the rotation of the fan blade 32 drives the inner ring 333 to rotate in the outer ring 331, at the same time, through the expansion of the fan blade 32, the distance between the fan blades 32 in the same group is increased, the distance between the two groups of fan blades 32 is reduced, and the stirring range is expanded;

[0067] Step S33: Stirring and cleaning are completed. Stirring stops, and the bidirectional electric telescopic rod 37 returns to its initial state.

[0068] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A device for preparing high-strength fracturing sand for oil production, characterized in that, It includes a housing (2), a scrubbing mechanism (3), two rotating mechanisms (5), a transfer mechanism (6), and a controller; The two rotating mechanisms (5) are symmetrically distributed at both ends of the shell (2) to drive the shell (2) to rotate. The scrubbing mechanism (3) is horizontally installed inside the shell (2) to scrub the fracturing sand inside the shell (2). The transfer mechanism (6) is horizontally placed on the ground and located at the bottom of the shell (2). The controller is installed on the outer side of the shell (2). The scrubbing mechanism (3), the two rotating mechanisms (5), and the transfer mechanism (6) are all electrically connected to the controller. The scrubbing mechanism (3) includes a spiral shaft (31), two pairs of fan blades (32), two first cylinders (34), two second cylinders (35), and two drive components connected to the controller; The fan blades (32) are arranged obliquely, and the two pairs of fan blades (32) are threadedly connected to the outer ring of the spiral shaft (31). The two drive components are arranged between the two pairs of fan blades (32) and located at the root of the fan blades (32). The two first cylinders (34) and the two second cylinders (35) are respectively arranged between the two pairs of fan blades (32). One end of the first cylinder (34) and the second cylinder (35) are respectively fixed on the two fan blades (32) of the same pair. The other end of the first cylinder (34) and the other end of the second cylinder (35) slide and are sealed together. The drive assembly includes two rotating parts (33), a fixed ring (36), and several bidirectional electric telescopic rods (37). The several bidirectional electric telescopic rods (37) are all fixedly installed between two fan blades (32) of the same pair through the fixed ring (36). One end of each of the two rotating parts (33) is fixed on the two fan blades (32) of the same pair, and the other end is fixedly connected to the two movable ends of the bidirectional electric telescopic rods (37). The two movable ends of the bidirectional electric telescopic rods (37) abut against and are fixed on the two rotating parts (33).

2. The apparatus for preparing high-strength fracturing sand for oil production according to claim 1, characterized in that, The rotating mechanism (5) includes two servo motors (51), two drive wheels (52), two driven wheels (53), and a rotating shaft (54). The drive wheels (52) are mounted on the servo motors (51) and mesh with the driven wheels (53). The driven wheels (53) are fixedly mounted on the rotating shaft (54). The rotating shaft (54) is fixedly connected to the housing (2). Both servo motors (51) are electrically connected to the controller.

3. The apparatus for preparing high-strength fracturing sand for oil production according to claim 1, characterized in that, The fracturing sand preparation device also includes two first supports (4), the shell (2) is erected on the ground by the two first supports (4), and two rotating mechanisms (5) are fixedly installed on the two first supports (4).

4. The apparatus for preparing high-strength fracturing sand for oil production according to claim 1, characterized in that, The transfer mechanism (6) includes a second support (61), a sliding component (62), a conveyor belt (63), a plurality of stirring shafts (64), a plurality of connecting shafts (65), and a plurality of gear assemblies (66). Several stirring shafts (64) are rotatably connected to a sliding assembly (62) at both ends by several gear assemblies (66). The sliding assembly (62) includes two slide rails (621) and several electric sliders (622). The several electric sliders (622) are divided into two groups of equal number and are slidably connected to the two slide rails (621). The two slide rails (621) are fixed to the inner side of the second brackets (61) on both sides. The two ends of the connecting shaft (65) are detachably connected to the second brackets (61). The conveyor belt (63) is wound around the outer ring of the several connecting shafts (65).

5. The apparatus for preparing high-strength fracturing sand for oil production according to claim 4, characterized in that, The gear assembly (66) includes a connecting block (661), a gear (662) and a rack (663). The gear (662) and the rack (663) mesh with each other. The rack (663) is fixed to the connecting block (661) by bolts. The connecting block (661) is fixed to the inner side of the second brackets (61) on both sides by bolts. The gear (662) is mounted on the stirring shaft (64).

6. A high-strength fracturing sand preparation device for oil production according to any one of claims 1 to 5, characterized in that, The fracturing sand preparation device also includes a filter plate (1) and a locking mechanism. One side of the filter plate (1) is hinged to the housing (2), and the other side is fixedly connected to the right side of the housing (2) through the locking mechanism.

7. A method for preparing high-strength fracturing sand for oil production, characterized in that, The preparation of fracturing sand using the apparatus of claim 4 specifically includes the following steps; Step S10: Place the fracturing sand to be cleaned into the shell (2); Step S20: Cover and fix the filter plate (1); Step S30: Start the scrubbing mechanism (3) to clean the fracturing sand; Step S40: After cleaning, start the rotating mechanism (5). The rotating mechanism (5) rotates the shell (2) counterclockwise. After the shell (2) rotates to the specified angle, pour out the sewage in the shell (2). Then, rotate the shell (2) clockwise through the rotating mechanism (5) to make the shell (2) return to the correct position. Open the filter plate (1). Rotate the shell (2) clockwise through the rotating mechanism (5) to make the fracturing sand in the shell (2) fall onto the conveyor belt (63) of the transfer mechanism (6) under the action of gravity. Step S50: Start the transfer mechanism (6). Under the stirring of the stirring shaft (64), the fracturing sand is evenly spread on the conveyor belt (63). Step S60: After drying to a certain extent, the conveyor belt (63) will transport the fracturing sand to the designated location.

8. The preparation method according to claim 7, characterized in that, Step S30 specifically includes the following steps: Step S31: The bidirectional electric telescopic rod (37) retracts, the fan blades (32) rotate and stir the fracturing sand, the distance between the two fan blades (32) in the same pair of fan blades (32) is brought closer, the distance between the two pairs of fan blades (32) is increased, and the stirring range is expanded; Step S32: After the bidirectional electric telescopic rod (37) retracts to the set state, the bidirectional electric telescopic rod (37) extends, the fan blades (32) rotate in the opposite direction, stir the fracturing sand, increase the distance between the fan blades (32) in the same group, and shorten the distance between the two pairs of fan blades (32), thus expanding the stirring range. Step S33: Repeat steps S31 to S32 until the scrubbing time reaches the set value, the stirring and cleaning is completed, and the stirring stops.

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