Raw material grinding equipment for preparation of dry powder fracturing fluid

Abstract

The invention discloses a raw material grinding device for preparing dry powder fracturing fluid in the technical field of dry powder fracturing fluid processing, comprising a pre-crusher and an air mill, wherein the lower end of the pre-crusher is connected with a spiral feeding pipe, which can guide the pre-crushed material into the air mill, a separator is arranged between the pre-crusher and the air mill, and a guide component is arranged between the pre-crusher, the air mill and the separator, and the guide component comprises: an air flow regulating pipe, which is located between the air mill and the separator; a heat dissipation pipe group, which runs through the pre-crusher, and the gas in the separator can enter the pre-crusher through the heat dissipation pipe group; and a dust removal pipe group, wherein an electrostatic dust removal device is arranged in the dust removal pipe group. The invention reduces the speed of the low-temperature gas guided out from the air mill and guides it into the pre-crusher as heat dissipation, thereby avoiding direct discharge of the low-temperature gas to cause waste of cold energy, and taking away the dust content in the material entering the air mill, thereby reducing the possibility of dust explosion in the air mill.

Description

Technical Field

[0001] The present invention relates to the technical field of dry powder fracturing fluid processing, in particular to raw material grinding equipment for preparing dry powder fracturing fluid. Background Art

[0002] Dry powder fracturing fluid is a powdered solid. Different from traditional water-based and oil-based liquid fracturing fluids, it can be quickly mixed with water to form a fracturing working fluid with high viscosity. Traditional water-based fracturing consumes tens of thousands of cubic meters of water per well. Dry powder fracturing fluid can reduce water consumption by 30% to 50% and is suitable for arid areas.

[0003] Before processing dry powder fracturing fluid, the raw materials need to be pretreated, and natural polymers (such as guar gum) need to be crushed. In order to maintain the crushing accuracy, existing dry powder fracturing fluids often use air flow mills for crushing. In the air flow milling process, in order to prevent high temperature from causing molecular chain breakage, the guar gum crushing temperature needs to be always less than 40°C. The gas needs to be cooled before being introduced into the air flow mill. The temperature of the compressed gas drops sharply after expansion, and direct discharge causes waste of cooling energy. In addition, the dust content in the crushing air flow is high, and dust removal equipment needs to be installed. The friction of high-speed air flow can easily generate static electricity, causing dust explosions. Summary of the Invention

[0004] The technical problem of the present invention is to provide raw material grinding equipment for preparing dry powder fracturing fluid, so as to reduce the speed of the low-temperature gas discharged from the gas mill and introduce it into the pre-crusher to cool the mechanical equipment, avoid the direct discharge of the low-temperature gas and cause waste of cold energy, and through the heat dissipation process of the gas, remove the dust content in the material entering the gas mill, thereby reducing the possibility of dust explosion in the gas mill.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a raw material grinding device for preparing dry powder fracturing fluid, comprising a pre-crusher and an air mill, wherein the lower end of the pre-crusher is connected to a spiral feed pipe, and the spiral feed pipe can introduce the pre-crushed material into the air mill, and a separator is provided between the pre-crusher and the air mill, and the separator can separate the gas from the crushed material, and a flow guide component is provided between the pre-crusher, the air mill and the separator, and the flow guide component includes:

[0006] An airflow regulating pipe is located between the gas mill and the separator. The high-speed low-temperature gas passes through the airflow regulating pipe and has its flow rate reduced before entering the separator.

[0007] A heat dissipation pipe group, which runs through the pre-crusher, and the gas in the separator can enter the pre-crusher through the heat dissipation pipe group, and the heat dissipation pipe group can reduce the dust content in the pre-crushed material;

[0008] The dust removal pipe group is provided with an electrostatic dust removal device, and the air flow can enter the dust removal pipe group after passing through the heat dissipation pipe group.

[0009] As a further solution of the present invention, the air grinder includes a compressor and an annular airbag, which is arranged around the bottom of the air grinder, and multiple groups of pulse airflow output parts are fixedly installed in the annular airbag, and the pulse airflow output parts are introduced into the air grinder from the lower end. A support base is rotatably installed in the air grinder corresponding to the upper part of the pulse airflow output part, and a lower copper rod is fixedly installed in the middle position of the lower surface of the support base, and the lower end of the lower copper rod is grounded. An upper copper rod is fixedly installed on the edge of the upper surface of the support base through a conductive bearing, and the upper end of the upper copper rod is attached to the inner wall of the air grinder. The output end of the compressor is connected to the annular airbag through an insulation pipe, and a drive motor is provided at the bottom of the air grinder. The drive motor drives the lower copper rod to rotate through two groups of mutually meshing insulating gears, and the pulse airflow output part is an intermittent airflow jet.

[0010] As a further solution of the present invention, the pre-crusher includes a crushing section, a feeding section and a discharge section, the feeding section is fixedly installed on the crushing section, a material input nozzle is provided at the upper end of the feeding section, multiple groups of crushing rollers are arranged in parallel in the crushing section, a cutting piece is provided above the crushing roller, and the cutting piece rotates in a circle above the crushing roller, the discharge section is fixedly installed at the lower end of the crushing section, a guide hopper is fixedly installed in the discharge section, the lower end of the guide hopper is fixedly connected to the spiral feeding pipe, and the other end of the spiral feeding pipe passes through the discharge section and extends to the outside of the pre-crusher.

[0011] As a further solution of the present invention, the heat dissipation pipe group includes an upper guide pipe, a side guide pipe and a connecting pipe. The upper guide pipe is provided with two groups and is fixedly connected to the two ends of the feeding section respectively. The side guide pipe is also provided with two groups symmetrically installed on the left and right sides of the crushing section. The side guide pipe on the left is fixedly connected to a group of the upper guide pipes through a connecting pipe, and the other group of the upper guide pipes is fixedly connected to the separator through a separation outlet pipe. The side guide pipe on the right is fixedly connected to an electrostatic precipitator pipe, and the other end of the electrostatic precipitator pipe is fixedly connected to the compressor.

[0012] As a further solution of the present invention, inclined plates are fixedly installed on both sides of the upper end of the feed section, and an air flow cavity is formed between the inclined plate and the feed section. A plurality of mounting cross bars are arranged in the air flow cavity, and a plurality of connecting rods are rotatably installed on the mounting cross bars through spherical connecting seats. A knocking ball is fixedly installed at both ends of the connecting rod, and the rotation of the connecting rod can enable the knocking ball to continuously knock the inclined plate. The side guide pipe is located below the crushing roller.

[0013] As a further solution of the present invention, a collection tank is fixedly installed at the lower end of the separator, and a baffle plate is provided at the upper end of the separator. The baffle plate and the inner wall of the separator form a filter cavity, and a breathable cloth is sleeved between the filter cavity and the baffle plate. One end of the separation outlet pipe is fixedly installed in the filter cavity.

[0014] As a further solution of the present invention, the airflow regulating tube is filled with porous medium, an air pump is fixedly installed on the separation outlet tube, and air pumps are provided on the upper guide tube on the front side and the side guide tube on the right side.

[0015] As a further solution of the present invention, a rotating motor and a driving gear set are provided on one side of the crushing section, and the rotating motor and the driving gear set can drive the crushing rollers and the cutting piece to rotate, and the adjacent crushing rollers rotate relative to each other, and the cutting piece rotates continuously in a circular motion.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. In the present invention, the gas discharged from the gas mill enters the pre-crusher along with the heat dissipation tube group, and enters the pre-crusher through the low-temperature gas to cool the internal parts of the pre-crusher, thereby preventing the pre-crusher from stopping working or being damaged due to excessive temperature of the parts due to long-term operation, avoiding the waste of cold energy caused by the discharge of refrigerants, saving resources, and realizing the recycling of gas. When the gas flows into the rear part of the heat dissipation tube group, the airflow passes through the inside of the pre-crusher. During the passage, the airflow can take away part of the dust generated in the pre-crushing process, reducing the dust content in the preliminary crushed material, thereby reducing the dust content inside the gas mill during processing, and further reducing the possibility of dust explosion caused by the gas mill.

[0018] 2. In the present invention, the pulse airflow output part inputs low-temperature gas into the interior of the air mill through a compressor. The pulse airflow output part is an intermittent airflow jet, which can perform air grinding and crushing in a more energy-efficient manner. During the crushing process, the driving motor drives the supporting base plate to rotate, and the rotation of the supporting base plate drives the upper copper rod and the lower copper rod to rotate. The upper copper rod continuously rubs against the inner wall of the air mill. Through the friction of the upper copper rod, the electric charge generated by the high-speed airflow on the inner wall of the air mill is accumulated on the upper copper rod. The electric charge of the upper copper rod is grounded through the conductive bearing and the lower copper rod, and the electric charge is conducted underground, further reducing the possibility of dust explosion caused by the accumulation of electric charge in the air mill. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 This is a schematic diagram of the structure of the present invention from a front side perspective;

[0021] Figure 2 This is a schematic diagram of the rear side perspective structure of the present invention;

[0022] Figure 3 Schematic diagram of the structure of the pre-crusher in the present invention;

[0023] Figure 4 This is a cross-sectional view of the pre-crusher structure in the present invention Figure 1 ;

[0024] Figure 5 This is a cross-sectional view of the pre-crusher structure in the present invention Figure 2 ;

[0025] Figure 6 For the present invention Figure 5 A partial schematic diagram of the structure at point A;

[0026] Figure 7 It is a structural cross-sectional view of the separator in the present invention;

[0027] Figure 8 It is a structural sectional view of the gas grinder in the present invention.

[0028] In the attached figure: 1. Pre-crusher; 101. Crushing section; 102. Feeding section; 103. Leading-out section; 2. Air mill; 3. Separator; 4. Compressor; 5. Separation lead-out pipe; 6. Upper guide pipe; 7. Connecting pipe; 8. Side guide pipe; 9. Electrostatic dust removal pipe; 10. Spiral feeding pipe; 11. Collecting tank; 12. Air flow regulating pipe; 13. Annular air bag; 14. Blocking plate; 15. Filter chamber; 16. Breathable cloth; 17. Guide hopper; 18. Crushing roller; 19. Cutting piece; 20. Inclined plate; 21. Knocking ball; 22. Mounting cross bar; 23. Connecting rod; 24. Air flow chamber; 25. Pulse air flow output piece; 26. Lower copper rod; 27. Support bottom plate; 28. Upper copper rod. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making any creative efforts shall fall within the scope of protection of the present invention.

[0030] See also Figures 1-8The present invention provides a technical solution: a raw material grinding device for preparing dry powder fracturing fluid, comprising a pre-crusher 1 and an air mill 2, wherein the lower end of the pre-crusher 1 is connected to a spiral feed pipe 10, which can introduce the pre-crushed material into the air mill 2, a separator 3 is provided between the pre-crusher 1 and the air mill 2, and the separator 3 can separate the gas from the crushed material, and a flow guide component is provided between the pre-crusher 1, the air mill 2 and the separator 3, and the flow guide component includes:

[0031] The airflow regulating pipe 12 is located between the gas mill 2 and the separator 3. After the high-speed low-temperature gas passes through the airflow regulating pipe 12, the flow rate is reduced and the gas enters the separator 3.

[0032] The heat dissipation pipe group runs through the pre-crusher 1, and the gas in the separator 3 can enter the pre-crusher 1 through the heat dissipation pipe group. The heat dissipation pipe group can reduce the dust content in the pre-crushed material;

[0033] The dust removal pipe group is equipped with an electrostatic dust removal device, and the airflow can enter the dust removal pipe group after passing through the heat dissipation pipe group.

[0034] During operation, the crushed material in the present invention is initially crushed by the pre-crusher 1, and the pre-crushed material enters the air mill 2 through the spiral feed pipe 10, and is ejected by the intermittent air flow in the air mill 2 (to reduce energy loss), and the high-speed particles collide and break each other and rub against the wall, so as to further impact and crush the material. The crushed material enters the air flow regulating pipe 12 along with the air flow, and the air flow regulating pipe 12 reduces the gas flow rate (reduces the friction between the air flow and the inner wall of the equipment, and reduces the possibility of static electricity generation), so that the crushed material and the air flow enter the separator 3, and the separator 3 separates the crushed material and the gas, and the gas enters the pre-crusher 1 along with the heat dissipation pipe group, and enters the pre-crusher 1 through the low-temperature gas, and the pre-crushed The internal parts of the machine 1 are cooled to prevent the pre-crusher 1 from stopping working or being damaged due to excessive temperature of the parts due to long-term operation, and to avoid waste of cold energy caused by discharge between refrigerants, saving resources, and realizing the recycling of gas. When the gas flows into the rear process of the heat dissipation pipe group, the air flow passes through the inside of the pre-crusher 1. During the process, the air flow can take away part of the dust generated in the pre-crushing process, reduce the dust content in the preliminary crushed material, thereby reducing the internal dust content of the air mill 2 during processing, and further reducing the possibility of dust explosion in the air mill 2. The air flow carrying dust enters the dust removal pipe group, and the dust removal pipe group removes dust. After dust removal, the air flow is cooled again and enters the air mill 2 to ensure that the material is always in a low temperature state during the crushing process.

[0035] As a further solution of the present invention, the air mill 2 includes a compressor 4 and an annular airbag 13. The annular airbag 13 is arranged around the bottom of the air mill 2. Multiple groups of pulse airflow output members 25 are fixedly installed in the annular airbag 13. The pulse airflow output members 25 are introduced into the air mill 2 from the lower end. A support base plate 27 is rotatably installed above the pulse airflow output member 25 in the air mill 2. A lower copper rod 26 is fixedly installed in the middle position of the lower surface of the support base plate 27. The lower end of the lower copper rod 26 is grounded. An upper copper rod 28 is fixedly installed on the edge of the upper surface of the support base plate 27 through a conductive bearing. The upper end of the upper copper rod 28 is attached to the inner wall of the air mill 2. The output end of the compressor 4 is connected to the annular airbag 13 through an insulation pipe. A drive motor is provided at the bottom of the air mill 2. The drive motor drives the lower copper rod 26 to rotate through two groups of mutually meshing insulating gears. The pulse airflow output member 25 is an intermittent airflow jet.

[0036] During operation, during the processing of the air grinder 2 in the present invention, the pulse airflow output part 25 inputs low-temperature gas into the interior through the compressor 4. The pulse airflow output part 25 is an intermittent airflow injection, which can perform air grinding and crushing in a more energy-efficient manner. During the crushing process, the driving motor drives the supporting base plate 27 to rotate, and the rotation of the supporting base plate 27 drives the upper copper rod 28 and the lower copper rod 26 to rotate. The upper copper rod 28 continuously rubs against the inner wall of the air grinder 2. Through the friction of the upper copper rod 28, the electric charge generated on the inner wall of the air grinder 2 due to the high-speed airflow is accumulated on the upper copper rod 28. The electric charge of the upper copper rod 28 is grounded through the conductive bearing and the lower copper rod 26, and the electric charge is introduced into the ground, further reducing the possibility of electric charge accumulation in the air grinder 2 and the occurrence of dust explosion.

[0037] As a further solution of the present invention, the pre-crusher 1 includes a crushing section 101, a feeding section 102 and a lead-out section 103. The feeding section 102 is fixedly mounted on the crushing section 101. A material input nozzle is provided at the upper end of the feeding section 102. Multiple groups of crushing rollers 18 are arranged in parallel in the crushing section 101. A cutting member 19 is provided above the crushing roller 18. The cutting member 19 rotates in a circle above the crushing roller 18. The lead-out section 103 is fixedly mounted on the lower end of the crushing section 101. A guide hopper 17 is fixedly mounted in the lead-out section 103. The lower end of the guide hopper 17 is fixedly connected to the spiral feeding pipe 10. The other end of the spiral feeding pipe 10 passes through the lead-out section 103 and extends to the outside of the pre-crusher 1.

[0038] During operation, the material of the present invention enters the pre-crusher 1 through the feed section 102, and the material automatically falls under the action of gravity. The material is crushed by the rotation of the cutting piece 19 and the mutual grinding of multiple groups of crushing rollers 18. The crushed material falls from the gap between the crushing rollers 18 into the outlet section 103, and then from the guide hopper 17 in the outlet section 103, and finally enters the air mill 2 from the spiral feeding pipe 10 at the lower end of the guide hopper 17.

[0039] As a further solution of the present invention, the heat dissipation pipe group includes an upper guide pipe 6, a side guide pipe 8 and a connecting pipe 7. Two groups of upper guide pipes 6 are provided and are fixedly connected to the two ends of the feeding section 102 respectively. Two groups of side guide pipes 8 are also provided and are symmetrically installed on the left and right sides of the crushing section 101. The left side guide pipe 8 is fixedly connected to one group of upper guide pipes 6 through the connecting pipe 7, and the other group of upper guide pipes 6 is fixedly connected to the separator 3 through the separation outlet pipe 5. The right side guide pipe 8 is fixedly connected to an electrostatic precipitator pipe 9, and the other end of the electrostatic precipitator pipe 9 is fixedly connected to the compressor 4.

[0040] During operation, the two groups of upper guide tubes 6 in the present invention are arranged opposite to each other, and the airflow enters the front upper guide tube 6 through the rear upper guide tube 6, and then the airflow enters the side guide tube 8 on the left through the connecting tube 7, and then the airflow enters the crushing section 101 from the side guide tube 8, and the airflow flows from under the crushing roller 18 into the side guide tube 8 on the right. The dust in the material after preliminary crushing is taken away by the airflow, and a large amount of dust is prevented from entering the air mill 2 along the spiral feeding pipe 10. The airflow circulates between the upper guide tube 6 and the side guide tube 8, and its low-temperature airflow can evenly cool and dissipate heat for the pre-crusher 1. An electrostatic adsorption electrode is arranged in the electrostatic dust removal tube 9 to remove and purify the circulating gas before entering the compressor 4.

[0041] As a further solution of the present invention, inclined plates 20 are fixedly installed on both sides of the upper end of the feed section 102, and an air flow cavity 24 is formed between the inclined plate 20 and the feed section 102. Multiple groups of mounting cross bars 22 are arranged in the air flow cavity 24, and multiple groups of connecting rods 23 are rotatably installed on the mounting cross bars 22 through spherical connecting seats. A knocking ball 21 is fixedly installed at both ends of the connecting rod 23. The rotation of the connecting rod 23 can enable the knocking ball 21 to continuously knock on the inclined plate 20, and the side guide pipe 8 is located below the crushing roller 18.

[0042] During operation, the airflow of the present invention flows into the upper guide tube 6 on the front side through the airflow cavity 24, and the equipment is cooled during the airflow circulation process. In addition, the airflow drives the connecting rod 23 to rotate, and the rotation of the connecting rod 23 drives the knocking ball 21 to continuously knock on the inclined plate 20. Through the continuous knocking of the knocking ball 21, the dust adhered to the top of the pre-crusher 1 can fall off under the knocking action, thereby avoiding dust accumulation in the pre-crusher 1.

[0043] As a further solution of the present invention, a collecting tank 11 is fixedly installed at the lower end of the separator 3, and a baffle plate 14 is provided at the upper end of the separator 3. The baffle plate 14 and the inner wall of the separator 3 form a filter chamber 15. A breathable cloth 16 is sleeved between the filter chamber 15 and the baffle plate 14, and one end of the separation outlet pipe 5 is fixedly installed in the filter chamber 15.

[0044] During operation, the baffle plate 14 and the breathable cloth 16 of the present invention can both restrict the flow of particulate material into the separation outlet pipe 5, thereby ensuring thorough and clean gas-solid separation.

[0045] As a further solution of the present invention, the airflow regulating tube 12 is filled with a porous medium, an air pump is fixedly installed on the separation outlet tube 5, and air pumps are provided on the front upper guide tube 6 and the right side guide tube 8.

[0046] During operation, the high-speed gas in the present invention enters the airflow regulating tube 12, and the airflow velocity is reduced by the porous medium in the airflow regulating tube 2, and the airflow dust is preliminarily cleaned to prevent the high-speed airflow from entering the separator 3 and the pre-crusher 1, and generating more static electricity due to friction.

[0047] As a further solution of the present invention, a rotating motor and a driving gear set are provided on one side of the crushing section 101. The rotating motor and the driving gear set can drive the crushing roller 18 and the cutting piece 19 to rotate. The adjacent crushing rollers 18 rotate relative to each other, and the cutting piece 19 rotates continuously in a circular motion.

[0048] During operation, the air pump on the separation outlet pipe 5 of the present invention serves as a main power source, and the air pumps on the upper guide pipe 6 and the side guide pipe 8 serve as auxiliary pressure stabilizing devices.

[0049] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. Raw material grinding equipment for preparing dry powder fracturing fluid, comprising a pre-crusher (1) and an air grinder (2), characterized in that: The lower end of the pre-crusher (1) is connected to a spiral feed pipe (10), and the spiral feed pipe (10) can guide the pre-crushed material into the gas mill (2). A separator (3) is provided between the pre-crusher (1) and the gas mill (2), and the separator (3) can separate the gas from the crushed material. A flow guide component is provided between the pre-crusher (1), the gas mill (2) and the separator (3), and the flow guide component includes: an air flow regulating pipe (12), and the air flow regulating pipe (12) is located between the gas mill (2) and the separator (3). After the high-speed low-temperature gas passes through the air flow regulating pipe (12), the flow velocity is reduced and the gas enters the separator (3); The gas mill (2) includes a compressor (4) and an annular airbag (13); a heat dissipation pipe group, wherein the heat dissipation pipe group passes through the pre-crusher (1), and the gas in the separator (3) can enter the pre-crusher (1) through the heat dissipation pipe group, and the heat dissipation pipe group can reduce the dust content in the pre-crushed material; The pre-crusher (1) comprises a crushing section (101), a feeding section (102) and an outlet section (103), wherein the feeding section (102) is fixedly mounted on the crushing section (101), a material input nozzle is provided at the upper end of the feeding section (102), a plurality of crushing rollers (18) are arranged in parallel in the crushing section (101), a cutting member (19) is provided above the crushing rollers (18), and the cutting member (19) rotates in a circular manner above the crushing rollers (18), the outlet section (103) is fixedly mounted on the lower end of the crushing section (101), a guide hopper (17) is fixedly mounted in the outlet section (103), the lower end of the guide hopper (17) is fixedly connected to the spiral feeding pipe (10), and the other end of the spiral feeding pipe (10) passes through the outlet section (103) and extends to the outside of the pre-crusher (1); The heat dissipation pipe group includes an upper guide pipe (6), a side guide pipe (8) and a connecting pipe (7). The upper guide pipe (6) is provided with two groups and is fixedly connected to the two ends of the feeding section (102). The side guide pipe (8) is also provided with two groups symmetrically installed on the left and right sides of the crushing section (101). The left side guide pipe (8) is fixedly connected to one group of the upper guide pipes (6) through the connecting pipe (7), and the other group of the upper guide pipes (6) is fixedly connected to the separator (3) through the separation outlet pipe (5). The right side guide pipe (8) is fixedly connected to an electrostatic precipitator pipe (9), and the other end of the electrostatic precipitator pipe (9) is fixedly connected to the compressor (4); Inclined plates (20) are fixedly mounted on both sides of the upper end of the feed section (102), and an airflow cavity (24) is formed between the inclined plates (20) and the feed section (102). Multiple groups of mounting cross bars (22) are arranged in the airflow cavity (24), and multiple groups of connecting rods (23) are rotatably mounted on the mounting cross bars (22) via spherical connecting seats. Both ends of the connecting rods (23) are fixedly mounted with knocking balls (21), and the rotation of the connecting rods (23) enables the knocking balls (21) to continuously knock on the inclined plates (20). The side guide tube (8) is located below the crushing roller (18); The dust removal pipe group is provided with an electrostatic dust removal device, and the air flow can enter the dust removal pipe group after passing through the heat dissipation pipe group.

2. The raw material grinding equipment for preparing dry powder fracturing fluid according to claim 1, characterized in that: The annular air bag (13) is arranged around the bottom of the gas grinder (2), and a plurality of pulse airflow output members (25) are fixedly installed in the annular air bag (13). The pulse airflow output members (25) are introduced into the gas grinder (2) from the lower end. A supporting base plate (27) is rotatably installed above the pulse airflow output member (25) in the gas grinder (2). A lower copper rod (26) is fixedly installed in the middle position of the lower surface of the supporting base plate (27). The lower end of the lower copper rod (26) is fixedly mounted on the lower surface of the supporting base plate (27). The upper surface edge of the supporting base plate (27) is fixedly mounted with an upper copper rod (28) via a conductive bearing, and the upper end of the upper copper rod (28) is attached to the inner wall of the air mill (2). The output end of the compressor (4) is connected to the annular air bag (13) via an insulation pipe. A driving motor is provided at the bottom of the air mill (2), and the driving motor drives the lower copper rod (26) to rotate via two sets of mutually meshing insulating gears. The pulse airflow output member (25) is an intermittent airflow jet.

3. The raw material grinding equipment for preparing dry powder fracturing fluid according to claim 1, characterized in that: A collecting tank (11) is fixedly mounted on the lower end of the separator (3), a baffle plate (14) is provided on the upper end of the separator (3), the baffle plate (14) and the inner wall of the separator (3) form a filter cavity (15), a breathable cloth (16) is sleeved between the filter cavity (15) and the baffle plate (14), and one end of the separation outlet pipe (5) is fixedly mounted on the filter cavity (15).

4. The raw material grinding equipment for preparing dry powder fracturing fluid according to claim 3, characterized in that: The airflow regulating tube (12) is filled with a porous medium, an air pump is fixedly installed on the separation outlet tube (5), and an air pump is provided on the upper guide tube (6) on the front side and the side guide tube (8) on the right side.

5. The raw material grinding equipment for preparing dry powder fracturing fluid according to claim 1, characterized in that: A rotating motor and a driving gear set are provided on one side of the crushing section (101), and the rotating motor and the driving gear set can drive the crushing rollers (18) and the cutting piece (19) to rotate, so that adjacent crushing rollers (18) rotate relative to each other, and the cutting piece (19) rotates continuously in a circular motion.

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