Closed type conveying equipment for dry polymer powder for fracturing

Abstract

The invention discloses closed type polymer dry powder conveying equipment for fracturing, and belongs to the technical field of conveying equipment, the closed type polymer dry powder conveying equipment comprises a positive and negative pressure conversion assembly, the positive and negative pressure conversion assembly comprises a powder conveying pipe, the powder conveying pipe is communicated with a Roots blower, the air inlet end and the air outlet end of the Roots blower are both communicated with a valve shell, and a valve element is rotationally connected into the valve shell; according to the device, under the condition that the powder conveying pipe is blocked, part of polymer dry powder is pumped into the filter cloth bag through negative pressure generated by air pumping of the Roots blower, dry powder accumulation in the powder conveying pipe is remarkably reduced in the process, then, pipelines of the pipe replacing assembly are switched, and therefore the powder conveying pipe can be replaced, and the powder conveying pipe can be replaced conveniently. By means of the Roots blower blowing mode, residual dry powder in the powder conveying pipe is effectively blown, so that the conveying effect of wind power is improved, the dry powder in the powder conveying pipe is blown twice, the automatic unblocking function is achieved, and efficient operation of equipment is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of conveying equipment, in particular to a conveying equipment for closed-type polymer dry powder for fracturing. Background Art

[0002] Fracturing is a technology used to extract underground oil and natural gas. In this process, fracturing fluid is usually injected into the underground rock formation to create cracks and release the oil and natural gas trapped in the rock. During the processing of fracturing fluid, polymer dry powder needs to be transported and mixed with water, and the transportation is mostly carried out through pneumatic conveying equipment. Pneumatic conveying equipment is a mechanical equipment that uses compressed air as power to transport polymer dry powder from one location to another. This equipment is widely used in the petroleum, chemical, building materials, food and other industries.

[0003] A Chinese patent discloses a pneumatic conveying device for powder (authorization announcement number CN118458378B), which includes: a machine, a feeding device, a conveying pipe, and a collecting device arranged in sequence along the powder conveying direction. In the present invention, in the process of relieving the pressure of the conveying pipe, the upper airbag and the lower airbag are driven to expand and contract respectively, destroying the powder structure accumulated in the elbow, so that the powder can be conveyed normally, and the inner diameter of the conveying pipe is changed to avoid the accumulation of powder. If the conveying pipe is still blocked and the pressure continues to increase, the pressure is blown obliquely into the conveying pipe through the air guide pipe, and the accumulated powder is further crushed and conveyed. In addition, the upper airbag is driven to shake through the connecting component, which increases the crushing effect of the powder again, and has a good effect on clearing the powder accumulated at the elbow, which can effectively avoid blockage.

[0004] When the pneumatic conveying system is used for long-distance transportation, the conveying kinetic energy of the pneumatic transmission equipment will gradually weaken, which may cause the polymer dry powder to settle in the pipeline. The sedimentation phenomenon usually causes the dry powder to accumulate in the pipeline, which hinders the gas flow and causes pipeline blockage. At the same time, the star-shaped unloader will continue to discharge materials, causing the pipeline blockage problem to become more serious. At present, many common clearing technologies rely on manual removal of pipelines, and the operation steps are complicated and not convenient enough. In the above-mentioned patent, the pipeline clearing method is only for the polymer dry powder at the pipeline elbow, and the clearing range is also very limited. For this reason, we propose a conveying device for polymer dry powder for closed fracturing. Summary of the invention

[0005] The object of the present invention is to provide a closed type polymer dry powder conveying device for fracturing to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: A conveying device for polymer dry powder for closed fracturing comprises a positive-negative pressure conversion component, the positive-negative pressure conversion component comprises a powder conveying pipe, the powder conveying pipe is connected with a Roots blower, the air inlet and air outlet of the Roots blower are both connected with a valve housing, a valve core is rotatably connected inside the valve housing, a T-shaped valve cavity is excavated inside the valve core, a fixed housing is arranged on the upper sides of the two valve housings, two worm gears are rotatably connected inside the fixed housing, and the worm gear is fixedly connected to the valve core, a rotating rod is rotatably connected to the fixed housing, an adjusting motor is fixedly connected to the side wall of the fixed housing, the output end of the adjusting motor is fixedly connected to the rotating rod, a worm is fixedly connected to the rotating rod, and the worm is meshed with the worm gear, a pressure sensor is fixedly connected to the powder conveying pipe, and the pressure sensor is electrically connected to the adjusting motor, a negative pressure pipe is connected between one of the valve housings and the powder conveying pipe, a tube changing assembly and a discharge assembly are connected to the powder conveying pipe, a transmission assembly is fixedly connected between the positive-negative pressure conversion assembly and the discharge assembly and the tube changing assembly, and an air inlet valve is connected to the powder conveying pipe.

[0007] As a further solution of the present invention, the pipe changing assembly includes a pipe changing box, and the pipe changing box is connected to the powder conveying pipe, a moving box is slidably connected inside the pipe changing box, an electric push rod is fixedly connected between the pipe changing box and the moving box, and a pipe changing barrel is rotatably connected inside the moving box.

[0008] As a further solution of the present invention, a rotating rod is rotatably connected to the tube changing box, a gear is fixedly connected to the rotating rod, a tooth surface is fixedly connected to the side wall of the tube changing cylinder, and the tooth surface meshes with the gear.

[0009] As a further solution of the present invention, a conveying pipe and a powder storage pipe are drilled inside the tube changing cylinder, a filter bag and a support frame are fixedly connected inside the powder storage pipe, and the support frame is located inside the filter bag.

[0010] As a further solution of the present invention, one end of the support frame passes through the filter bag and is rotatably connected to a fan blade, and an eccentric iron ball is fixedly connected to the rotating shaft of the fan blade.

[0011] As a further solution of the present invention, the unloading assembly includes a unloading box, the lower end of the unloading box is connected to a unloading shell, and the lower end of the unloading shell is connected to a powder conveying pipe, a rotating cylinder is rotatably connected between the left and right side walls of the unloading shell, and a plurality of evenly distributed unloading pieces are fixedly connected to the rotating cylinder.

[0012] As a further solution of the present invention, a limiting cylinder is fixedly connected to the side wall of the unloading shell, a moving block is slidably connected inside the limiting cylinder, a side wall of the limiting cylinder away from the unloading box is rotatably connected to a screw, and the screw is threadedly connected to the moving block, a square rod is inserted into the rotating cylinder, and the square rod is rotatably connected to the moving block.

[0013] As a further solution of the present invention, a first bonding steel sheet is inserted into one end of the square rod away from the moving block, a spring is fixedly connected between the first bonding steel sheet and the square rod, a mounting frame is fixedly connected to the side wall of the unloading shell, a driving motor is fixedly connected to the side wall of the mounting frame, a second bonding steel sheet is fixedly connected to the output end of the driving motor, and the second bonding steel sheet is against the first bonding steel sheet.

[0014] As a further solution of the present invention, the transmission assembly includes two first universal joints, and the two first universal joints are fixedly connected to the rotating rod and the rotating rod respectively, and a square telescopic rod is fixedly connected between the two first universal joints.

[0015] As a further solution of the present invention, the transmission assembly further includes two second universal joints, and the two second universal joints are fixedly connected to the screw rod and the rotating rod respectively, and a connecting rod is fixedly connected between the two second universal joints.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. When the present invention is used, in the case that the powder conveying pipe is blocked, the negative pressure generated by the suction of the Roots blower is used to draw part of the polymer dry powder into the filter bag. This process significantly reduces the accumulation of dry powder inside the powder conveying pipe. Subsequently, the pipeline of the pipe replacement assembly is switched, and the remaining dry powder in the powder conveying pipe is effectively blown by the blowing method of the Roots blower, thereby improving the transmission effect of the wind force, and achieving the blowing of the dry powder inside the powder conveying pipe twice, which plays a role of automatic blockage clearing and ensures the efficient operation of the equipment.

[0017] 2. When the present invention is used, the transmission assembly and the discharge assembly cooperate to automatically stop the rotation of the discharge piece when the powder conveying pipe is blocked. At the same time, after the inside of the powder conveying pipe resumes work, the discharge piece can be automatically rotated to continue discharging.

[0018] 3. When the present invention is used, through the synergistic effect of the fan blades and the eccentric iron balls, the wind can cause the fan blades to rotate when conveying the polymer dry powder in the filter bag, driving the support frame to vibrate eccentrically, thereby effectively cleaning the polymer dry powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional stereogram of a conveying device for polymer dry powder used in closed fracturing; Figure 2 It is an exploded view of the positive and negative pressure conversion component in a closed type polymer dry powder conveying device for fracturing; Figure 3 It is a schematic diagram of the structure inside the pipe changing box in a closed type polymer dry powder conveying device for fracturing; Figure 4It is a structural schematic diagram of a pipe replacement component part in a closed type polymer dry powder delivery device for fracturing; Figure 5 It is a schematic diagram of the structure inside the electric push rod in a closed type polymer dry powder conveying device for fracturing; Figure 6 for Figure 5 The enlarged view of point A in the middle; Figure 7 It is a structural schematic diagram of a discharge assembly in a closed-type polymer dry powder conveying device for fracturing; Figure 8 for Figure 7 The enlarged view of point B in the middle; Fig. 9 This is a state diagram of a square rod and a mounting frame in a discharge assembly of a closed-type polymer dry powder conveying device for fracturing; Fig.10 This is a state diagram of the valve core rotating in a closed-type polymer dry powder delivery device for fracturing.

[0020] In the figure: 1. Positive and negative pressure conversion assembly; 101. Powder conveying pipe; 102. Roots blower; 103. Valve housing; 104. Valve core; 105. T-type valve chamber; 106. Fixed housing; 107. Worm gear; 108. Rotating rod; 109. Adjustment motor; 110. Worm; 111. Pressure sensor; 112. Negative pressure pipe; 2. Tube changing assembly; 201. Tube changing box; 202. Moving box; 203. Electric push rod; 204. Tube changing cylinder; 205. Rotating rod; 206. Gear; 207. Tooth surface; 208. Delivery pipe; 209. Powder storage pipe; 210. Filter bag; 211. Support frame; 212. Fan blade; 213. Eccentric iron ball; 3. Discharging assembly; 301. Discharging box; 302. Discharging shell; 303. Rotating cylinder; 304. Discharging sheet; 305. Limiting cylinder; 306. Moving block; 307. Screw; 308. Square rod; 309. First bonding steel sheet; 310. Spring; 311. Mounting frame; 312. Driving motor; 313. Second bonding steel sheet; 4. Transmission assembly; 401. First universal joint; 402. Square telescopic rod; 403. Second universal joint; 404. Connecting rod; 5. Intake valve. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of 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.

[0022] Example 1: Please refer to Figures 1 to 5In an embodiment of the present invention, a closed type polymer dry powder conveying device for fracturing includes a positive and negative pressure conversion component 1, the positive and negative pressure conversion component 1 includes a powder conveying pipe 101, the powder conveying pipe 101 is connected to a Roots blower 102, the air inlet and air outlet ends of the Roots blower 102 are both connected to a valve housing 103, and the valve housing 103 is connected to the powder conveying pipe 101, a valve core 104 is rotatably connected inside the valve housing 103, a T-shaped valve cavity 105 is excavated inside the valve core 104, and the valve cores 104 on the left and right sides of the Roots blower 102 are in different directions. In the initial state, the Roots blower 102 realizes air intake and air outlet through the T-shaped valve cavities 105 in the two valve cores 104. Gas, so that the air flow flows in the powder conveying pipe 101, a fixed shell 106 is arranged on the upper side of the two valve shells 103, two worm gears 107 are rotatably connected inside the fixed shell 106, and the worm gear 107 is fixedly connected to the valve core 104 through the rotating shaft at the center of the circle, a rotating rod 108 is rotatably connected between the left and right side walls of the fixed shell 106, an adjusting motor 109 is fixedly connected to the side wall of the fixed shell 106, the output end of the adjusting motor 109 is fixedly connected to the rotating rod 108, a worm 110 is fixedly connected to the rotating rod 108, and the worm 110 is meshed with the worm gear 107, a pressure sensor 111 is fixedly connected to the powder conveying pipe 101, and the pressure sensor 111 It is electrically connected to the regulating motor 109, a negative pressure pipe 112 is connected between one of the valve shells 103 and the powder conveying pipe 101, the powder conveying pipe 101 is connected with a tube changing component 2 and a discharge component 3, the positive and negative pressure conversion component 1 and the discharge component 3 are fixedly connected with the tube changing component 2 with a transmission component 4, the powder conveying pipe 101 is connected with an air intake valve 5, when working normally, the dry powder in the discharge component 3 will fall into the powder conveying pipe 101, and the dry powder will be transported to the silo through the airflow of the powder conveying pipe 101. The silo is connected to the end of the powder conveying pipe 101, which is not shown in the figure. The air intake valve 5 is in a closed state when working normally. When the powder conveying pipe 101 is blocked When the powder conveying pipe 101 is blocked, the air pressure in the powder conveying pipe 101 will gradually increase. At the same time, this air pressure change will be monitored by the pressure sensor 111 and calculated by the microprocessor. When this air pressure exceeds the preset value, it can be determined that the inside of the powder conveying pipe 101 is blocked. At this time, the microprocessor starts the regulating motor 109 through the controller, so that the regulating motor 109 drives the rotating rod 108 to rotate. At the same time, the rotating rod 108 drives the worm gear 107 to rotate 90 degrees through the worm 110, and the worm gear 107 drives the valve core 104 to rotate, so that the air inlet end of the Roots blower 102 is connected to the powder conveying pipe 101 through the negative pressure pipe 112, and the air outlet end of the Roots blower 102 is connected to the outside air. Fig.10 As shown, at this time, the inside of the powder conveying pipe 101 is in a negative pressure state, so that the dry powder blocked inside the powder conveying pipe 101 moves due to the negative pressure suction.

[0023] The pipe changing assembly 2 includes a pipe changing box 201, and the pipe changing box 201 is connected to the powder conveying pipe 101, a moving box 202 is slidably connected inside the pipe changing box 201, an electric push rod 203 is fixedly connected between the pipe changing box 201 and the moving box 202, a pipe changing barrel 204 is rotatably connected inside the moving box 202, a rotating rod 205 is rotatably connected to the pipe changing box 201, a gear 206 is fixedly connected to the rotating rod 205, a tooth surface 207 is fixedly connected to the side wall of the pipe changing barrel 204, and the tooth surface 207 is meshed with the gear 206, when the gear 206 and the pipe changing barrel 204 are meshed with the worm 110 and the worm wheel 107, if the rotating rod 108 rotates the same number of circles, then through the adjustment of the ratio, when the worm wheel 107 rotates 90 degrees, the pipe changing barrel 204 can rotate 180 degrees, a conveying pipe 208 and a powder storage pipe 209 are excavated inside the pipe changing barrel 204, and the powder storage pipe 20 9 is fixedly connected with a filter bag 210 and a support frame 211, and the support frame 211 is located inside the filter bag 210, one end of the support frame 211 penetrates the filter bag 210 and is rotatably connected with a fan blade 212, and an eccentric iron ball 213 is fixedly connected to the rotating shaft of the fan blade 212. In the initial state, the powder conveying pipe 101 is connected with the conveying pipe 208. When the powder conveying pipe 101 is blocked, the rotation of the rotating rod 108 will also drive the gear 206 to rotate through the transmission component 4. The gear 206 drives the tube changing cylinder 204 to rotate 180 degrees through the engagement with the tooth surface 207, so that the powder storage pipe 209 is connected with the powder conveying pipe 101. At the same time, the air inlet valve 5 is opened, and the outside air enters the powder conveying pipe 101, which helps to pump the dry powder inside the powder conveying pipe 101, so that the dry powder can enter the filter bag 210. This process effectively reduces the dry powder inside the powder conveying pipe 101.

[0024] It is worth noting that there can be multiple air intake valves 5 distributed at the front end of the bend of the powder conveying pipe 101. The bends of the powder conveying pipe 101 are prone to blockage. When clearing the blockage, multiple air intake valves 5 can be opened one by one, which can improve the extraction effect of dry powder and further improve the blockage clearing effect.

[0025] Example 2: Please refer to Figures 5 to 10Based on Example 1, the unloading assembly 3 includes a unloading box 301, the lower end of the unloading box 301 is connected to a unloading shell 302, and the lower end of the unloading shell 302 is connected to the powder conveying pipe 101, and a rotating cylinder 303 is rotatably connected between the left and right side walls of the unloading shell 302, and a plurality of evenly distributed unloading pieces 304 are fixedly connected to the rotating cylinder 303, and a limiting cylinder 305 is fixedly connected to the side wall of the unloading shell 302, and a moving block 306 is slidably connected inside the limiting cylinder 305, and the limiting cylinder 305 is away from a side wall of the unloading box 301. The rotating cylinder 303 is rotatably connected with a screw rod 307, and the screw rod 307 is threadedly connected with the moving block 306. A square rod 308 is inserted into the rotating cylinder 303, and the square rod 308 is rotatably connected with the moving block 306. A first bonding steel sheet 309 is inserted into the end of the square rod 308 away from the moving block 306. A spring 310 is fixedly connected between the first bonding steel sheet 309 and the square rod 308. A mounting frame 311 is fixedly connected to the side wall of the unloading shell 302. A driving motor 312 is fixedly connected to the side wall of the mounting frame 311. The driving motor 312 is fixedly connected to the side wall of the unloading shell 302. The output end of the machine 312 is fixedly connected with a second bonded steel sheet 313, and the second bonded steel sheet 313 is against the first bonded steel sheet 309. In the initial state, the driving motor 312 drives the second bonded steel sheet 313 to rotate, so that the second bonded steel sheet 313 drives the first bonded steel sheet 309 to rotate, and the first bonded steel sheet 309 drives the square rod 308 to rotate, thereby realizing the rotation of the discharge sheet 304. During the rotation of the discharge sheet 304, the dry powder inside the discharge box 301 can be discharged to the inside of the powder conveying pipe 101. At the same time, the discharge sheet 304 also plays a role of sealing between the discharge box 301 and the powder conveying pipe 101. When the rotating rod 205 rotates, the rotating rod 205 will also drive the screw 307 to rotate through the transmission assembly 4, so that the screw 307 drives the moving block 306 to move, and the moving block 306 pulls the square rod 308 to move, prompting the first bonding steel sheet 309 to separate from the second bonding steel sheet 313, so that the driving motor 312 cannot drive the square rod 308 to rotate through the bonding between the second bonding steel sheet 313 and the first bonding steel sheet 309.

[0026] The transmission assembly 4 includes two first universal joints 401, and the two first universal joints 401 are respectively fixedly connected to the rotating rod 205 and the rotating rod 108, and a square telescopic rod 402 is fixedly connected between the two first universal joints 401. The transmission assembly 4 also includes two second universal joints 403, and the two second universal joints 403 are respectively fixedly connected to the screw 307 and the rotating rod 205, and a connecting rod 404 is fixedly connected between the two second universal joints 403. When the rotating rod 108 rotates, the first universal joints 401 are driven to rotate at the same time. The universal joint 401 rotates, and the first universal joint 401 drives another first universal joint 401 to rotate through the square telescopic rod 402. At the same time, the first universal joint 401 drives the second universal joint 403 to rotate through the rotating rod 205. During the rotation of the second universal joint 403, it will drive another second universal joint 403 to rotate through the connecting rod 404, so that the second universal joint 403 can drive the screw 307 to rotate. The principles of the first universal joint 401 and the second universal joint 403 are both existing technologies and will not be repeated here.

[0027] The working principle of the present invention is: When the present invention is in normal use, first, the staff starts the Roots blower 102 and the driving motor 312. The driving motor 312 makes the second bonding steel sheet 313 and the first bonding steel sheet 309 bonded to each other, so that the second bonding steel sheet 313 drives the first bonding steel sheet 309 to rotate, and the first bonding steel sheet 309 drives the square rod 308 to rotate, thereby realizing the rotation of the discharge sheet 304. During the rotation of the discharge sheet 304, the dry powder inside the discharge box 301 can be discharged to the inside of the powder conveying pipe 101. When the Roots blower 102 is started, the Roots blower 102 generates airflow to blow the dry powder to transport it into the silo. When the powder conveying pipe 101 is blocked, the air pressure in the powder conveying pipe 101 will gradually increase. At the same time, this air pressure change will be monitored by the pressure sensor 111 and calculated by the microprocessor. When this air pressure exceeds the preset value, it can be determined that the inside of the powder conveying pipe 101 is blocked. At this time, the microprocessor starts the regulating motor 109 through the controller, so that the regulating motor 109 drives the rotating rod 108 to rotate. At the same time, the rotating rod 108 drives the worm gear 107 to rotate 90 degrees through the worm 110, and the worm gear 107 drives the valve core 104 to rotate, so that the air inlet end of the Roots blower 102 is connected to the powder conveying pipe 101 through the negative pressure pipe 112, and the air outlet end of the Roots blower 102 is connected to the outside air. Fig.10 As shown, at this time, the inside of the powder conveying pipe 101 is in a negative pressure state, so that the dry powder blocked inside the powder conveying pipe 101 moves due to the negative pressure suction; At the same time, during the rotation of the rotating rod 108, the first universal joint 401 is driven to rotate at the same time. The first universal joint 401 drives another first universal joint 401 to rotate through the square telescopic rod 402. At the same time, the first universal joint 401 drives the rotating rod 205 to rotate, and the rotating rod 205 drives the gear 206 to rotate. At the same time, the gear 206 drives the tube changing cylinder 204 to rotate 180 degrees through the meshing with the tooth surface 207, so that the powder storage tube 209 can be connected with the powder conveying tube 101. At the same time, the air intake valve 5 is automatically opened by the controller of the controller to allow outside air to enter the powder conveying tube 101, which helps to pump the dry powder inside the powder conveying tube 101, so that the dry powder can enter the filter bag 210. This process effectively reduces the dry powder inside the powder conveying tube 101. During the rotation of the rotating rod 205, the second universal joint 403 is also driven to rotate. During the rotation of the second universal joint 403, the connecting rod 404 is used to drive another second universal joint 403 to rotate, so that the second universal joint 403 can drive the screw rod 307 to rotate, the screw rod 307 drives the moving block 306 to move, and the moving block 306 pulls the square rod 308 to move, so that the first bonding steel sheet 309 is separated from the second bonding steel sheet 313, so that the driving motor 312 cannot drive the square rod 308 to rotate through the bonding of the second bonding steel sheet 313 and the first bonding steel sheet 309, so that the unloading sheet 304 stops rotating, thereby stopping the unloading; Subsequently, the regulating motor 109 is started again, driving the valve core 104 to reset and rotate 90 degrees. At this time, the airflow generated by the Roots blower 102 is blown into the powder conveying pipe 101 again to blow the remaining dry powder in the powder conveying pipe 101. Since the dry powder inside the powder conveying pipe 101 has been reduced, the interference of the dry powder on the airflow is reduced, which enables the airflow to blow the dry powder better and achieve an effective blockage clearing effect. At this time, the entire device is in the initial working state again. After the dry powder inside the discharge box 301 is unloaded, the staff can start the electric push rod 2 03, can drive the mobile box 202 to move, so that the powder storage pipe 209 can be connected with the powder conveying pipe 101, so that the airflow generated by the Roots blower 102 blows the dry powder inside the filter bag 210, and blows the previously stored dry powder back into the powder conveying pipe 101 until the dry powder is blown into the silo. In this process, the airflow will also drive the fan blades 212 to rotate. When the wind transports the polymer dry powder in the filter bag 210, it can make the fan blades 212 rotate, driving the support frame 211 to vibrate eccentrically, thereby effectively cleaning the polymer dry powder.

[0028] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for conveying polymer dry powder for closed fracturing, comprising a positive and negative pressure conversion component (1), characterized in that: The positive-negative pressure conversion assembly (1) comprises a powder conveying pipe (101), the powder conveying pipe (101) is connected to a Roots blower (102), the air inlet end and the air outlet end of the Roots blower (102) are both connected to a valve housing (103), a valve core (104) is rotatably connected inside the valve housing (103), a T-shaped valve cavity (105) is excavated inside the valve core (104), a fixed housing (106) is arranged on the upper side of the two valve housings (103), two worm gears (107) are rotatably connected inside the fixed housing (106), and the worm gear (107) is fixedly connected to the valve core (104), a rotating rod (108) is rotatably connected to the fixed housing (106), and an adjustment motor (109) is fixedly connected to the side wall of the fixed housing (106), and the The output end of the regulating motor (109) is fixedly connected to the rotating rod (108); a worm (110) is fixedly connected to the rotating rod (108), and the worm (110) is meshed with the worm wheel (107); a pressure sensor (111) is fixedly connected to the powder conveying pipe (101), and the pressure sensor (111) is electrically connected to the regulating motor (109); a negative pressure pipe (112) is connected between one of the valve housings (103) and the powder conveying pipe (101); a tube changing assembly (2) and a discharge assembly (3) are connected to the powder conveying pipe (101); a transmission assembly (4) is fixedly connected between the positive and negative pressure conversion assembly (1) and the discharge assembly (3) and the tube changing assembly (2); and an air intake valve (5) is connected to the powder conveying pipe (101).

2. The conveying equipment for polymer dry powder for closed fracturing according to claim 1, characterized in that: The pipe changing assembly (2) comprises a pipe changing box (201), and the pipe changing box (201) is connected to the powder conveying pipe (101), a moving box (202) is slidably connected inside the pipe changing box (201), an electric push rod (203) is fixedly connected between the pipe changing box (201) and the moving box (202), and a pipe changing barrel (204) is rotatably connected inside the moving box (202).

3. The conveying equipment for polymer dry powder for closed fracturing according to claim 2, characterized in that: The tube changing box (201) is rotatably connected to a rotating rod (205), the rotating rod (205) is fixedly connected to a gear (206), and a tooth surface (207) is fixedly connected to a side wall of the tube changing cylinder (204), and the tooth surface (207) is meshed with the gear (206).

4. The conveying equipment for polymer dry powder for closed fracturing according to claim 3, characterized in that: A conveying pipe (208) and a powder storage pipe (209) are bored inside the tube changing cylinder (204), a filter bag (210) and a support frame (211) are fixedly connected inside the powder storage pipe (209), and the support frame (211) is located inside the filter bag (210).

5. The conveying equipment for polymer dry powder for closed fracturing according to claim 4, characterized in that: One end of the support frame (211) passes through the filter bag (210) and is rotatably connected to a fan blade (212), and an eccentric iron ball (213) is fixedly connected to the rotation axis of the fan blade (212).

6. The conveying equipment for polymer dry powder for closed fracturing according to claim 1, characterized in that: The discharge assembly (3) comprises a discharge box (301), the lower end of the discharge box (301) is connected to a discharge shell (302), and the lower end of the discharge shell (302) is connected to the powder conveying pipe (101), a rotating cylinder (303) is rotatably connected between the left and right side walls of the discharge shell (302), and a plurality of evenly distributed discharge pieces (304) are fixedly connected to the rotating cylinder (303).

7. The conveying equipment for polymer dry powder for closed fracturing according to claim 6, characterized in that: A limiting cylinder (305) is fixedly connected to the side wall of the discharge shell (302), a moving block (306) is slidably connected inside the limiting cylinder (305), a side wall of the limiting cylinder (305) away from the discharge box (301) is rotatably connected to a screw rod (307), and the screw rod (307) is threadedly connected to the moving block (306), and a square rod (308) is inserted into the rotating cylinder (303), and the square rod (308) is rotatably connected to the moving block (306).

8. The conveying equipment for polymer dry powder for closed fracturing according to claim 7, characterized in that: A first bonding steel sheet (309) is inserted into one end of the square rod (308) away from the moving block (306); a spring (310) is fixedly connected between the first bonding steel sheet (309) and the square rod (308); a mounting frame (311) is fixedly connected to the side wall of the discharge shell (302); a driving motor (312) is fixedly connected to the side wall of the mounting frame (311); a second bonding steel sheet (313) is fixedly connected to the output end of the driving motor (312); and the second bonding steel sheet (313) abuts against the first bonding steel sheet (309).

9. The conveying device for polymer dry powder for closed fracturing according to claim 4, characterized in that: The transmission assembly (4) comprises two first universal joints (401), and the two first universal joints (401) are fixedly connected to the rotating rod (205) and the rotating rod (108) respectively, and a square telescopic rod (402) is fixedly connected between the two first universal joints (401).

10. The conveying equipment for polymer dry powder for closed fracturing according to claim 9, characterized in that: The transmission assembly (4) further comprises two second universal joints (403), and the two second universal joints (403) are respectively fixedly connected to the screw rod (307) and the rotating rod (205), and a connecting rod (404) is fixedly connected between the two second universal joints (403).

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