An automatic powder feeding system for a fracturing site and its control method

Abstract

The present disclosure relates to a fracking site automatic powder feeding system and its control method, including: a bag-breaking device, an automatic powder feeding device, a positive and negative pressure generating device, and an automatic control device; the automatic control device is used to control the bag-breaking device to break the ton bag powder; control the positive and negative pressure generating device to start so that the raw material is sucked into the high-position automatic powder feeding device through the suction pipe; control the automatic powder feeding device to move to a predetermined position and automatically dock with the silo, and after the docking is completed, convey the raw material into the powder silo. To solve the problems that when supplementing raw materials to the silo at the fracking site in the past, it was necessary to use a 25-ton crane to hoist the ton bag raw material to the high-place feeding point. When manually feeding, there were blind spots and risks of hoisting across equipment during the hoisting of the crane, and a large number of construction personnel were required at the site, resulting in high labor costs and high labor intensity; during the feeding process, the powdered raw material was scattered to the construction site by the wind force, resulting in dust pollution.

Description

Technical Field

[0001] The present disclosure relates to the technical field of oilfield fracturing fluid preparation, and particularly to an automatic powder supply system for a fracturing site and a control method thereof. Background Art

[0002] When an oilfield shale oil platform well is under construction, it has the characteristics of continuously maintaining high quality, high efficiency, high standards, and continuous construction for 24 hours. During the process of preparing the fracturing fluid required for construction, a large amount of plant gum powder is used. In the past, it was necessary to use a 25-ton large-tonnage well crane to lift the ton bag raw materials to the silo and manually add the dry powder large bag materials, resulting in low work efficiency. There are blind spots during the hoisting operation, and accidents are prone to occur; there are cross operations on site, the hoisting space is limited, and there are potential safety hazards for equipment and personnel; moreover, when transporting the powder on site, it is in contact with air, resulting in certain dust pollution and environmental protection hidden danger problems. Summary of the Invention

[0003] The present disclosure provides an automatic powder supply system for a fracturing site and a control method thereof to solve the problems in the past fracturing site operation. When transporting raw materials to the silo, it is necessary to use a large-tonnage crane to lift the ton bag raw materials to the feeding place and manually feed them; there are blind spots during the hoisting of the crane, and the equipment use and maintenance costs are high. A large number of construction personnel are required on site, resulting in high labor costs and large labor intensity; during the feeding process, the powdered raw materials are in contact with air, resulting in dust pollution problems.

[0004] According to one aspect of the present disclosure, an automatic powder supply system for a fracturing site is provided, which is characterized by including: a bag-breaking device, an automatic powder supply device, a positive and negative pressure generating device, and an automatic control device;

[0005] The bag-breaking device is used for mechanically breaking the ton bag powder. After the bag is broken, the raw materials enter the bag-breaking device, and the bag-breaking device transports the raw materials to the automatic powder supply device on a predetermined silo through a suction pipe;

[0006] The automatic powder supply device is connected to the positive and negative pressure generating device. The positive and negative pressure generating device is used to generate negative pressure inside the automatic powder supply device, so that the raw materials in the bag-breaking device enter the automatic powder supply device, and / or generate positive pressure inside the automatic powder supply device, so that the raw materials inside the automatic powder supply device enter the silo;

[0007] The automatic control device is respectively connected to the bag-breaking device, the automatic powder supply device, and the positive and negative pressure generating device. The automatic control device is used to control the automatic powder supply device to start moving to a predetermined position, control the docking of the automatic powder supply device with the silo, and inject raw materials into the silo.

[0008] Preferably, the bag-breaking device includes: a powder silo, a bag-breaking cutter, a driving mechanism, a filter screen, and a vibrating feeding mechanism;

[0009] The top of the powder bin is open. A horizontal tool track is arranged near the lower part of the filter screen inside the powder bin. The bottom of the bag-breaking tool is connected to the tool track, and the cutting head of the bag-breaking tool faces upward.

[0010] The bag-breaking tool is connected to the driving mechanism, and the driving mechanism is used to drive the bag-breaking tool to move back and forth along both ends of the tool track.

[0011] The filter screen is installed inside the powder bin and is located below the cutting head.

[0012] The vibrating blanking mechanism is connected to the powder bin and is used to vibrate the powder bin.

[0013] The bottom of the powder bin is connected to the automatic powder supply device through a suction pipe.

[0014] Preferably, the vibrating blanking mechanism includes: a vibrator;

[0015] Vibrators are respectively arranged on the side walls of the powder bin in four directions. Among them, two opposite vibrators are in a group.

[0016] The vibrator is connected to the automatic control device, and the vibrator is used to generate vibrations alternately in two groups.

[0017] Preferably, the automatic powder supply device includes: a traveling mechanism, a negative pressure powder bin, a powder storage bin, a lifting mechanism, and a filter;

[0018] The bottom of the negative pressure powder bin is connected to the top of the powder storage bin, and the top of the negative pressure powder bin is connected to the positive and negative pressure generating device through a positive and negative pressure pipeline.

[0019] The powder storage bin is connected to the bag-breaking device. The bottom of the powder storage bin has a short joint for docking with the tank mouth of the bin, and a pneumatic discharge valve is installed inside the short joint.

[0020] The lifting mechanism is connected to the powder storage bin, and the lifting mechanism is used to drive the powder storage bin to rise or fall.

[0021] The filter is installed inside the negative pressure powder bin and is used to filter the gas entering the negative pressure powder bin from the powder storage bin.

[0022] The traveling mechanism is connected to the powder storage bin and is used to drive the powder storage bin to move to a predetermined position.

[0023] Preferably, it further includes: a micro oscillator;

[0024] The micro oscillator is installed on the side wall of the powder storage bin and is used to generate vibrations.

[0025] and / or;

[0026] A sealing mechanism is installed on the short joint, and the sealing mechanism is used to seal the position where the short joint is docked with the silo.

[0027] Preferably, it further includes: a backblower;

[0028] The backblower is installed near the top inside the negative pressure powder silo, and the backblower is used to clean the raw materials on the filter.

[0029] Preferably, the traveling mechanism includes: a traveling equipment frame, a trolley track, a moving trolley, and a servo motor;

[0030] The trolley track is arranged on the top of the traveling equipment frame, and the trolley track is above the silo, and the position of the trolley track corresponds to the position of the top tank opening of the silo;

[0031] The moving trolley is on the trolley track, and the powder storage bin is fixed on the moving trolley;

[0032] The servo motor is connected to the moving trolley, and the servo motor is used to drive the moving trolley to move back and forth on the trolley track.

[0033] Preferably, the automatic control device includes: a position sensing unit, a pressure detection and control unit, and a PLC controller;

[0034] The PLC controller is respectively connected to the position sensing unit and the pressure detection and control unit;

[0035] The position sensing unit is connected to the silo, and the position sensing unit is used to detect the real-time position of the automatic powder feeding device and transmit it to the PLC controller;

[0036] The pressure detection and control unit is respectively connected to the bag-breaking device, the automatic powder feeding device, and the positive and negative pressure generating device. The pressure monitoring and control unit is used to detect and adjust the real-time pressure inside the bag-breaking device, the automatic powder feeding device, and the positive and negative pressure generating device.

[0037] Preferably, the position sensing unit includes: a silo position sensor;

[0038] The silo position sensor is installed on the top of the silo. When the silo position sensor detects that the automatic powder feeding device reaches the position of the silo position sensor, it sends a position signal to the PLC controller;

[0039] The pressure detection and control unit includes: a pressure sensor, a vacuum relief valve, an intake valve, a gas supplement control valve, and a vacuum pressure stabilizing tank;

[0040] An air pressure sensor is installed inside the automatic powder feeding device for detecting the real-time air pressure value inside the automatic powder feeding device and transmitting it to the PLC controller;

[0041] A vacuum relief valve is installed at one end of the material suction pipe close to the bag breaking device, and an air inlet valve is connected to the side wall of the material suction pipe;

[0042] The automatic powder feeding device is respectively connected to the air supplement control valve and the vacuum pressure stabilizing tank.

[0043] According to one aspect of the present disclosure, there is provided a control method for an automatic powder feeding system at a fracturing site, including:

[0044] Using a crane to hoist a ton bag of powder to the inside of the bag breaking device of the automatic powder feeding system at the fracturing site with its bottom;

[0045] The automatic control device controls the bag breaking device to start and break the ton bag of powder. After bag breaking, the raw materials in the ton bag of powder fall downward into the bag breaking device;

[0046] The automatic control device controls the positive and negative pressure generating device to start, so as to generate a negative pressure inside the automatic powder feeding device, and the raw materials in the bag breaking device are sucked into the inside of the automatic powder feeding device through the material suction pipe;

[0047] The automatic control device controls the automatic powder feeding device to start. After moving to a predetermined position, the automatic control device controls the automatic powder feeding device to complete docking with the silo;

[0048] The automatic control device controls the positive and negative pressure generating device to start, so as to generate a positive pressure inside the automatic powder feeding device, and the raw materials inside the automatic powder feeding device are pushed into the inside of the silo through the positive pressure.

[0049] The present invention has at least the following beneficial effects:

[0050] The present disclosure provides an automatic powder feeding system and its control method at a fracturing site. By setting a bag breaking device, the ton bag raw materials are automatically broken. Through the automatic powder feeding device, the raw materials are accurately transported to the position where powder needs to be added. Through the positive and negative pressure generating device, the raw materials in the bag breaking device are automatically sucked into the automatic powder feeding device, and from the automatic powder feeding device, the raw materials are quickly transported into the silo. Through the automatic control device, the bag breaking device, the automatic powder feeding device, and the positive and negative pressure generating device are automatically controlled. It realizes machine bag breaking to replace the manual bag breaking method; the automatic powder feeding system replaces the traditional feeding mode of hoisting ton bag raw materials from the storage platform by a crane on site. It eliminates various safety hazards existing in the hoisting link, realizes the on-site automatic powder feeding operation mode, and solves the problem of dust pollution. At the same time, it can reduce the floor area of the equipment, as well as reduce the on-site labor cost and labor intensity. Description of the Drawings

[0051] The accompanying drawings here are incorporated into the specification and constitute a part of this specification. These drawings show embodiments consistent with the present disclosure and, together with the specification, are used to illustrate the technical solutions of the present disclosure.

[0052] Figure 1 Schematic diagram showing the structure of the automatic powder feeding system at the fracturing site according to an embodiment of the present disclosure.

[0053] Figure 2 Schematic diagram showing the structure of the bag-breaking device according to an embodiment of the present disclosure.

[0054] Figure 3 Schematic diagram showing the structure of the automatic powder feeding device according to an embodiment of the present disclosure.

[0055] Figure 4 Front view showing the silo and the traveling mechanism according to an embodiment of the present disclosure.

[0056] Figure 5 Top view showing the silo and the traveling mechanism according to an embodiment of the present disclosure.

[0057] In the figure, 1 - silo, 2 - automatic powder feeding device, 3 - positive and negative pressure generating device, 4 - bag-breaking device, 5 - suction pipe, 6 - gas pipeline, 7 - traveling equipment frame, 8 - trolley track, 9 - moving trolley, 10 - air compressor, 11 - vacuum suction machine, 12 - tank opening, 13 - silo position sensor, 14 - vacuum relief valve, 15 - intake valve, 16 - air supplement control valve, 17 - solenoid valve, 18 - electromagnetic main valve, 19 - gas storage tank, 21 - negative pressure powder bin, 22 - powder storage bin, 23 - filter, 24 - feeding port, 25 - micro oscillator, 26 - sealing gasket, 27 - back blower, 28 - pneumatic discharge valve, 29 - lifting cylinder, 30 - short circuit, 31 - powder feeding equipment frame, 41 - powder silo, 42 - bag-breaking cutter, 43 - filter screen, 44 - vibrator, 45 - cutter track. Detailed Description of the Invention

[0058] Hereinafter, various exemplary embodiments, features and aspects of the present disclosure will be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements having the same or similar functions. Although various aspects of the embodiments are shown in the drawings, the drawings do not have to be drawn to scale unless otherwise specified.

[0059] The special term "exemplary" here means "serving as an example, embodiment or illustrative". Any embodiment described here as "exemplary" does not have to be construed as superior to or better than other embodiments.

[0060] As used herein, the term "and / or" merely describes an associated relationship between associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the term "at least one" as used herein means any one of a plurality or any combination of at least two of a plurality. For example, including at least one of A, B, and C may represent including any one or more elements selected from the set consisting of A, B, and C.

[0061] In addition, to better illustrate the present disclosure, numerous specific details are given in the following detailed implementation manners. Those skilled in the art should understand that the present disclosure can also be implemented without certain specific details. In some instances, methods, means, elements, and circuits well-known to those skilled in the art are not described in detail to highlight the gist of the present disclosure.

[0062] Figure 1 A schematic structural diagram of a fracturing site automatic powder feeding system according to an embodiment of the present disclosure is shown; Figure 2 A schematic structural diagram of a bag-breaking device according to an embodiment of the present disclosure is shown; Figure 3 A schematic structural diagram of an automatic powder feeding device according to an embodiment of the present disclosure is shown; Figure 4 A front view of a silo and a traveling mechanism according to an embodiment of the present disclosure is shown; Figure 5 A top view of a silo and a traveling mechanism according to an embodiment of the present disclosure is shown. As Figures 1-5 As shown, a fracturing site automatic powder feeding system includes: a bag-breaking device 4, an automatic powder feeding device 2, a positive and negative pressure generating device 3, and an automatic control device; the bag-breaking device 4 is used for breaking the ton bag powder, and the raw material after bag-breaking enters the bag-breaking device 4. The bag-breaking device 4 is connected to the automatic powder feeding device 2 through a suction pipe 5 for transporting the raw material to a predetermined silo 1; the automatic powder feeding device 2 is connected to the positive and negative pressure generating device 3, and the positive and negative pressure generating device 3 is used to generate negative pressure inside the automatic powder feeding device 2, so that the raw material in the bag-breaking device 4 enters the automatic powder feeding device 2, and / or generate positive pressure inside the automatic powder feeding device 2, so that the raw material inside the automatic powder feeding device 2 enters the silo 1; the automatic control device is respectively connected to the bag-breaking device 4, the automatic powder feeding device 2, and the positive and negative pressure generating device 3, and the automatic control device is used to control the automatic powder feeding device 2 to start moving to a predetermined position, control the docking of the automatic powder feeding device 2 with the silo 1, and add raw materials to the silo.

[0063] In the embodiments of the present disclosure, there are a total of 4 silos 1, which are arranged side by side on the powder tanker. The bag-breaking device 4 is arranged on the ground. When breaking the bag, the crane for transporting the bulk powder in the ton bag is used to lift the ton bag powder to the feeding port of the low-position bag-breaking device 4. At this time, the crane used does not need to lift the ton bag powder to the top of the powder silo more than 3 meters high and hover at the feeding port about 5 meters. Since the bag-breaking device 4 is on the ground and the crane hoists at a low position, there is no need to move to the silo 1 for high-position hoisting, which is more labor-saving, fast and safe.

[0064] The bottom of the ton bag powder is sent downward into the feeding port of the bag-breaking device 4, and the automatic control device controls the bag-breaking device 4 to start breaking the bag. After the bag is broken and the raw material is falling, the crane shakes the ton bag powder bag slightly up and down to make all the internal raw materials enter the bag-breaking device 4.

[0065] The automatic control device controls the positive and negative pressure generating device 3 to start, so that a negative pressure is generated inside the automatic powder feeding device 2. The bottom of the bag-breaking device 4 is connected to the automatic powder feeding device 2 through the suction pipe 5. When a negative pressure is generated inside the automatic powder feeding device 2, the raw materials in the bag-breaking device 4 are sucked into the automatic powder feeding device 2 through the suction pipe 5. After the suction is completed, the automatic control device controls the automatic powder feeding device 2 to start. The automatic powder feeding device 2 moves to the silo 1 where powder needs to be added, and the automatic control device controls the automatic powder feeding device 2 to dock with the tank mouth 12 of the silo 1. After the docking is completed, the automatic control device controls the positive and negative pressure generating device 3 to start, so that a positive pressure is generated inside the automatic powder feeding device 2, and the raw materials inside the automatic powder feeding device 2 are pushed into the silo 1. After the powder adding operation is completed, the automatic control device controls the automatic powder feeding device 2 to separate from the silo 1 and move back to the initial position.

[0066] In the embodiments of the present disclosure, the positive and negative pressure generating device 3 includes: an air compressor 10, a vacuum feeder 11 and a gas storage tank 19; the air compressor 10 and the vacuum feeder 11 are respectively connected to the gas storage tank 19, and the gas storage tank 19 is connected to the automatic powder feeding device 2 through a gas pipeline 6; an electromagnetic main valve 18 is installed at one end of the gas pipeline 6; the air compressor 10, the vacuum feeder 11 and the electromagnetic main valve 18 are respectively connected to the automatic control device.

[0067] When it is necessary to suck the raw materials in the bag-breaking device 4, the automatic control device controls the vacuum feeder 11 to start. After the vacuum feeder 11 starts, it sucks the gas in the gas storage tank 19. When the air pressure in the gas storage tank 19 reaches the predetermined negative pressure value, the automatic control device controls the electromagnetic main valve 18 to open, and the gas in the automatic powder feeding device 2 is sucked into the gas storage tank 19 through the gas pipeline 6, and the air pressure in the automatic powder feeding device 2 decreases, so that the raw materials in the bag-breaking device 4 are sucked into the automatic powder feeding device 2 through the suction pipe 5.

[0068] When the automatic powder feeding device 2 moves to the bin 1 that needs powder addition and the docking is completed, the automatic control device controls the air compressor 10 to start. The air compressor 10 conveys compressed gas into the gas storage tank 19. The gas in the gas storage tank 19 enters the interior of the automatic powder feeding device 2 through the gas pipeline 6, causing the automatic powder feeding device 2 to open, so as to quickly input the raw material from the outlet of the automatic powder feeding device 2 into the interior of the bin 1. After the bin 1 is filled with powder, the automatic control device controls the air compressor 10 and the electromagnetic main valve 18 to close.

[0069] In the present disclosure, the bag-breaking device 4 includes: a powder bin 41, a bag-breaking cutter 42, a driving mechanism, a filter screen 43, and a vibrating feeding mechanism; the top of the powder bin 41 is open, a horizontal cutter track 45 is arranged at a position near the top inside the powder bin 41, the bottom of the bag-breaking cutter 42 is connected to the cutter track 45, and the cutter head of the bag-breaking cutter 42 faces upward; the bag-breaking cutter 42 is connected to the driving mechanism, and the driving mechanism is used to drive the bag-breaking cutter 42 to move back and forth along both ends of the cutter track 45; the filter screen 43 is installed inside the powder bin 41 and is located below the cutter head; the vibrating feeding mechanism is connected to the powder bin 41 and is used to vibrate the powder bin 41; the bottom of the powder bin 41 is connected to the automatic powder feeding device 2 through a suction pipe 5.

[0070] In an embodiment of the present disclosure, the upper half of the powder bin 41 is a cube with an open top, and the lower half is a conical body with a gradually narrowing diameter downward. The cutter track 45 is installed at a position near the middle height inside the powder bin 41, and both ends of the track are connected to the side walls on opposite sides inside the powder bin 41. The bag-breaking cutter 42 is slidably installed on the cutter track, and the bag-breaking cutter 42 can move back and forth at both ends of the cutter track.

[0071] The filter screen 43 is installed inside the powder bin 41 and is detachably connected to the powder bin 41. The filter screen 43 is located above the cutter track 45. The filter screen 43 has hole slots, and the positions of the hole slots correspond to the position of the lower cutter track 45. The length of the hole slots is slightly less than the length of the cutter track 45. The top of the bag-breaking tool passes through the hole slots and protrudes upward from the filter screen 43.

[0072] When bag-breaking is performed, after the crane hoists the ton bag of powder to above the bin 1, the bottom of the ton bag of powder is placed downward on the filter screen 43; the automatic control device connects and controls the driving mechanism to start, driving the bag-breaking cutter 42 to move quickly along the cutter track 45. The part of the bag-breaking cutter 42 protruding from the filter screen 43 contacts the bottom of the ton bag of powder, cutting the bottom of the ton bag of powder, so that the raw material in the ton bag of powder passes through the filter screen 43 downward and enters the bottom inside the powder bin 41.

[0073] The filter screen 43 serves to support the bulk bag powder, preventing the bulk bag powder from entering the powder bin 41 too deeply and covering the tool track 45, which may cause the bag-breaking tool 42 to get stuck during movement. At the same time, the filter screen 43 can filter out harmful impurities such as nylon bag fragments and plastic liner fragments that may be generated during bag breaking.

[0074] After the vacuum feeder 11 is started, the raw materials at the bottom of the powder bin 41 enter the automatic powder feeding device 2 through the suction pipe 5.

[0075] In the embodiment of the present disclosure, the upper half of the bag-breaking tool 42 is triangular, with the tip of the triangle facing upward, and the two sides are respectively provided with cutting edges, so that when the bag-breaking tool 42 reciprocates on the tool track 45, either side can contact the bottom of the bulk bag raw materials for bag breaking. The height by which the bag-breaking tool 42 protrudes from the filter screen 43 is the cutting depth during bag breaking.

[0076] While the bag-breaking tool 42 is breaking the bag, the automatic control device controls the vibration feeding mechanism to start. After the vibration feeding mechanism starts, it drives the powder bin 41 and the filter screen 43 to vibrate, causing the raw materials on the filter screen 43 to move quickly downward through the filter screen 43 and fall to the bottom of the powder bin 41, preventing the raw materials from accumulating on the filter screen 43 or adhering to the wall due to static electricity adsorption.

[0077] In the embodiment of the present disclosure, the driving mechanism is: a cutting cylinder; cutting cylinders are respectively connected to both sides of the powder bin 41, and the positions of the two cutting cylinders correspond to the positions at both ends of the track. The output shaft of the cutting cylinder passes through the side wall of the powder bin 41 and is connected to the bag-breaking tool 42. The automatic control device is connected to the cutting cylinder, and during bag breaking, the PLC controller controls the cutting cylinder to start and drive the bag-breaking tool 42 to move along the tool track 45. The two cutting cylinders alternately drive the bag-breaking tool 42 to reciprocate along the track.

[0078] In the present disclosure, the vibration feeding mechanism includes: a vibrator 44; the vibrator 44 is respectively arranged on the side walls of the powder bin 41 in four directions, and among them, two opposite vibrators 44 form a group; the vibrator 44 is connected to the automatic control device, and the vibrator 44 is used to generate vibrations alternately in two groups.

[0079] In the embodiments of the present disclosure, four vibrators 44 are respectively connected to an automatic control device. During blanking, the automatic control device first controls the start of vibration of two relatively arranged vibrators 44 in the first group to generate vibration. After a predetermined time, it controls the first group of vibrators 44 to turn off, and at the same time controls the start of vibration of the other two relatively arranged vibrators 44 in the second group to generate vibration. After a predetermined time, it controls the second group of vibrators 44 to turn off. By controlling the alternating vibration of the two groups of 4 vibrators 44, the adsorption force of static electricity of the raw materials is destroyed, and the situations of wall hanging and accumulation on the filter screen 43 are prevented. At the same time, the automatic control device can also adjust the frequency and amplitude of the vibrators 44 during vibration to make them equal to the predetermined vibration frequency and predetermined vibration amplitude.

[0080] In the present disclosure, the automatic powder feeding device 2 includes: a traveling mechanism, a negative pressure powder bin 21, a powder storage bin 22, a lifting mechanism, and a filter 23; the bottom of the negative pressure powder bin 21 is connected to the top of the powder storage bin 22, and the top of the negative pressure powder bin 21 is connected to the positive and negative pressure generating device 3 through a positive and negative pressure pipeline; the powder storage bin 22 is connected to the bag breaking device 4, and the bottom of the powder storage bin 22 has a short connection 30 for docking with the tank mouth 12 of the silo 1, and a pneumatic discharge valve 28 is installed inside the short connection 30; the lifting mechanism is connected to the powder storage bin 22, and the lifting mechanism is used to drive the powder storage bin 22 to rise or fall; the filter 23 is installed inside the negative pressure powder bin 21 and is used to filter the gas entering the negative pressure powder bin 21 from the powder storage bin 22; the traveling mechanism is connected to the powder storage bin 22 and is used to drive the powder storage bin 22 to move to a predetermined position.

[0081] In the embodiments of the present disclosure, the automatic control device is respectively connected to the traveling mechanism, the lifting mechanism, and the pneumatic discharge valve 28. The top of the negative pressure powder bin 21 is connected to the gas storage tank 19 through a gas pipeline 6. The side wall of the powder storage bin 22 has a feeding port 24, and the feeding port 24 is connected to the powder bin 41 of the bag breaking device 4 through a suction pipe 5.

[0082] After the bag breaking is completed, the automatic control device controls the vacuum feeder 11 to start and controls the electromagnetic main valve 18 to open. The vacuum feeder 11 sucks the gas in the negative pressure powder bin 21 and the powder storage bin 22 through the gas pipeline 6, so that the air pressure in the negative pressure powder bin 21 and the powder storage bin 22 is reduced, so that the raw materials in the powder bin 41 of the bag breaking device 4 enter the inside of the powder storage bin 22 through the suction pipe 5. Because the filter 23 is arranged inside the negative pressure powder bin 21, when the raw materials entering the powder storage bin 22 move towards the negative pressure powder bin 21, they will be blocked and filtered by the filter 23 and will not enter the negative pressure powder bin 21 upward to block the gas pipeline 6.

[0083] An external powder supply device frame 31 is provided outside the powder storage bin 22 and the negative pressure powder bin 21. The powder storage bin 22 and the negative pressure powder bin 21 are fixed inside the powder supply device frame 31 through a lifting mechanism, and the bottom of the powder supply device frame 31 is connected to a traveling mechanism. When feeding, the automatic control device controls the traveling mechanism to start, driving the powder supply device frame 31 and the internal powder storage bin 22 and negative pressure powder bin 21 to move to a predetermined position, which is the bin 1 where powder needs to be added. And the bottom opening of the short connection 30 of the powder storage bin 22 corresponds to the top tank opening 12 of the bin 1.

[0084] The automatic control device controls the lifting mechanism to start, driving the powder storage bin 22 to move downward, so that the short connection 30 at the bottom of the powder storage bin 22 is inserted downward into the top tank opening 12 of the bin 1 to complete the docking.

[0085] After the docking is completed, the automatic control device controls the air compressor 10 to start generating gas, which enters the negative pressure powder bin 21 through the gas pipeline 6, causing the pneumatic discharge valve 28 to open automatically. The gas in the negative pressure powder bin 21 moves downward into the powder storage bin 22, pushing the raw materials in the powder storage bin 22 downward to enter the bin 1 through the connection part between the short connection 30 and the tank opening 12. After all the raw materials in the powder storage bin 22 enter the bin 1, the automatic control device controls the air compressor 10 to shut down.

[0086] After the feeding is completed, the automatic control device controls the lifting mechanism to start, driving the powder storage bin 22 to move upward, separating the short connection 30 from the tank opening 12 of the bin 1. The automatic control device controls the traveling mechanism to start, driving the powder supply device frame 31 and the internal powder storage bin 22 and negative pressure powder bin 21 to move back to the initial position. Among them, the filter 23 can be a bag - type multi - stage filter 23.

[0087] In the embodiment of the present disclosure, the lifting mechanism is: a lifting cylinder 29; the bottom of the lifting cylinder 29 is fixed on the powder supply device frame 31, and the upper part of the piston of the lifting cylinder 29 is connected to the side wall of the powder storage bin 22. When in use, the automatic control device controls the lifting cylinder 29 to start, and drives the powder storage bin 22 to move up and down in the powder supply device frame 31 through the piston moving up and down in the cylinder.

[0088] In the present disclosure, it further includes: a micro - oscillator 25; the micro - oscillator 25 is installed on the side wall of the powder storage bin 22 for generating vibration; and / or; a sealing mechanism is installed on the short connection 30, and the sealing mechanism is used to seal the position where the short connection 30 is docked with the bin 1.

[0089] In the embodiments of the present disclosure, when the powder storage bin 22 is docked with the tank opening 12 and the pneumatic discharge valve 28 is opened, the automatic control device controls the micro oscillator 25 to start generating vibrations, and the micro oscillator 25 drives the side wall of the powder storage bin 22 to vibrate. The micro oscillator 25 is used to prevent the raw materials in the powder storage bin 22 from sticking to the wall. Through vibration, the raw materials attached to the inner wall of the powder storage bin 22 fall into the bin 1.

[0090] In the embodiments of the present disclosure, the sealing mechanism includes: a sealing gasket 26; an annular flange is provided on the outer side wall around the bottom stub 30 of the powder storage bin 22, and the sealing gasket 26 is installed on the bottom surface of the annular flange. When the lifting mechanism drives the stub 30 of the powder storage bin 22 to move downward, the stub 30 drives the sealing gasket 26 to move downward. When the stub 30 is inserted into the inside of the tank opening 12, the bottom surface of the sealing gasket 26 contacts the top surface near the tank opening 12 of the bin 1, thereby sealing the stub 30 and the tank opening 12 to prevent dust leakage during the feeding process.

[0091] In the present disclosure, it further includes: an air blower 27; the air blower 27 is installed at a position near the top inside the negative pressure powder bin 21, and the air blower 27 is used to clean the raw materials on the filter 23.

[0092] In the embodiments of the present disclosure, the air blower 27 is connected to the automatic control device. The air blower 27 is located above the filter 23. After the air blower 27 is started, the raw material dust attached to the bag filter 23 during filtration can be blown off by blowing air downward, cleaning the filter 23 and maintaining the filtering effect of the filter 23.

[0093] In the present disclosure, the traveling mechanism includes: a traveling equipment frame 7, a trolley track 8, a moving trolley 9, and a servo motor; the trolley track 8 is provided at the top of the traveling equipment frame 7, and the trolley track is above the bin 1, and the position of the trolley track 8 corresponds to the position of the tank opening 12 at the top of the bin 1; the moving trolley 9 is on the trolley track 8, and the powder storage bin 22 is fixed on the moving trolley 9; the servo motor is connected to the moving trolley 9, and the servo motor is used to drive the moving trolley 9 to move back and forth on the trolley track 8.

[0094] In the embodiments of the present disclosure, the traveling equipment frame 7 is a cuboid frame built by rectangular steel pipes, and the traveling equipment frame 7 covers the outside of the bin 1. The trolley track 8 is provided at the top of the traveling equipment frame 7, and the path of the trolley track 8 passes through the tank opening 12 at the top of each bin 1. The moving trolley 9 can move back and forth along both ends of the trolley track 8. The bottom of the powder supply equipment frame 31 is fixed on the moving trolley 9.

[0095] The servo motor is connected to an automatic control device. During feeding, the automatic control device controls the servo motor to start, driving the moving trolley 9 to move on the trolley track 8. When it reaches the predetermined position, that is, when it reaches the tank mouth 12 of the silo 1 that needs to be fed, the automatic control device controls the servo motor to shut down.

[0096] In the present disclosure, the automatic control device includes: a position sensing unit, a pneumatic pressure detection and control unit, and a PLC controller; the PLC controller is respectively connected to the position sensing unit and the pneumatic pressure detection and control unit; the position sensing unit is connected to the silo 1, and the position sensing unit is used to detect the real-time position of the automatic powder feeding device 2 and transmit it to the PLC controller; the pneumatic pressure detection and control unit is respectively connected to the bag breaking device 4, the automatic powder feeding device 2, and the positive and negative pressure generating device 3. The pneumatic pressure monitoring and control unit is used to detect and adjust the real-time pressure inside the bag breaking device 4, the automatic powder feeding device 2, and the positive and negative pressure generating device 3.

[0097] In the embodiment of the present disclosure, the PLC controller is respectively connected to the air compressor 10, the vacuum feeder 11, and the electromagnetic main valve 18 of the positive and negative pressure generating device 3, the cutting cylinder and the vibrator 44 of the bag breaking device 4, the pneumatic discharge valve 28, the lifting cylinder 29, the micro oscillator 25, the back blower 27, and the servo motor of the automatic powder feeding device 2. The PLC controller is used to control the start or shutdown of the devices connected thereto.

[0098] In the present disclosure, the position sensing unit includes: a silo position sensor 13; the silo position sensor 13 is installed on the top of the silo 1. The silo position sensor 13 is used to send a position signal to the PLC controller when it detects that the automatic powder feeding device 2 reaches the position of the silo position sensor 13; the pneumatic pressure detection and control unit includes: a pneumatic pressure sensor, a vacuum relief valve 14, an intake valve 15, a gas supplement control valve 16, and a vacuum pressure stabilizing tank; the pneumatic pressure sensor is installed inside the automatic powder feeding device 2 to detect the real-time pneumatic pressure value inside the automatic powder feeding device 2 and transmit it to the PLC controller; the vacuum relief valve 14 is installed at one end of the suction pipe 5 close to the bag breaking device 4, and the intake valve 15 is connected to the side wall of the suction pipe 5; the automatic powder feeding device 2 is respectively connected to the gas supplement control valve 16 and the vacuum pressure stabilizing tank.

[0099] In the embodiment of the present disclosure, there are four bin position sensors 13, which are respectively installed on the tops of the four bins 1. When the moving trolley 9 moves to the position of the bin position sensor 13 according to the instructions of the PLC controller, the bin position sensor 13 sends a position signal to the PLC controller. If the PLC controller determines that the position signal is sent by the bin position sensor 13 corresponding to the bin 1 that needs to be refilled, it controls the servo motor to turn off and the moving trolley 9 stops moving. At this time, the short-circuit 30 position of the powder storage bin 22 corresponds to the tank opening 12 position of the bin 1.

[0100] In the embodiment of the present disclosure, it further includes: an initial position sensor, which is arranged at a position close to one end on the trolley track 8, that is, the initial positions of the powder storage bin 22 and the moving trolley 9; after the powder storage bin 22 finishes refilling the powder bin, the PLC controller controls the servo motor to start and drives the moving trolley 9 to move in the direction of one end of the trolley track 8. When the moving trolley 9 moves to the position of the initial position sensor, the initial position sensor sends a position signal to the PLC controller, and the PLC controller thereby determines that the moving trolley 9 has returned to the initial position and controls the servo motor to turn off. Thus, the automatic reset after the powder storage bin 22 finishes refilling can be realized.

[0101] In the embodiment of the present disclosure, it further includes: a powder bin reset sensor; the powder bin reset sensor is installed on the powder supply equipment frame 31 and corresponds to the top position of the negative pressure powder bin 21. When the PLC controller controls the lifting cylinder 29 to start and drives the powder storage bin 22 and the negative pressure powder bin 21 to move downward, the top of the negative pressure powder bin 21 moves downward away from the powder bin reset sensor; when the lifting cylinder 29 moves upward and drives the top of the negative pressure powder bin 21 to move to the position of the powder bin reset sensor, the powder bin reset sensor sends a position signal to the PLC controller, and the PLC controller then determines that the negative pressure powder bin 21 and the powder storage bin 22 have returned to the initial position and controls the lifting cylinder 29 to turn off.

[0102] In the embodiment of the present disclosure, the PLC controller is respectively connected to a pressure sensor, a gas supplement control valve 16, and a vacuum pressure stabilizing tank.

[0103] When the inside of the powder storage bin 22 of the automatic powder supply device 2 is in a negative pressure state, the pressure inside the suction pipe 5 connected thereto decreases. When the powder bin 41 above the suction pipe 5 is filled with raw materials, if the raw material suction is difficult due to an accident, it may cause the negative pressure in the suction pipe 5 to reach the limit, resulting in the inward contraction and deformation of the suction pipe 5. The vacuum relief valve 14 is used to automatically open when the real-time pressure in the suction pipe 5 is less than a predetermined pressure, such as -0.8 MPa, so that a certain amount of gas enters the inside of the suction pipe 5 to adjust the air pressure in the suction pipe 5 to be less than the predetermined pressure.

[0104] The intake valve 15 is used to prevent the raw materials from being adsorbed on the inner wall of the suction pipe 5 due to static electricity generated by the continuous friction between the raw materials and the inner wall of the suction pipe 5 during the process of the raw materials entering the powder storage bin 22 through the suction pipe 5. While sucking the raw materials in the powder bin 41, the intake valve 15 is controlled to open, allowing a small amount of gas to enter the suction pipe 5 to eliminate the influence of static electricity in the suction pipe 5. At the same time, since the gas flow rate entering from the intake valve 15 is higher than the flow rate of the raw materials, it can drive the raw materials in the suction pipe 5 into the powder storage bin 22 together, thereby reducing the resistance during suction.

[0105] The air supplement control valve 16 is arranged at the top of the negative pressure powder bin 21. The top of the negative pressure powder bin 21 is connected to the vacuum pressure stabilizing tank through the solenoid valve 17; the PLC controller is connected to the solenoid valve 17.

[0106] An air pressure sensor is arranged inside the negative pressure powder bin 21 to detect the real-time pressure inside the negative pressure powder bin 21 and transmit it to the PLC controller. When the PLC controller determines that the real-time pressure inside the negative pressure powder bin 21 is less than the predetermined pressure, it controls the air supplement control valve 16 to open to adjust the pressure inside the negative pressure powder bin 21 to restore it to the predetermined pressure.

[0107] The vacuum pressure stabilizing tank is used to, when the pneumatic discharge valve 28 is opened to allow the raw materials in the powder storage bin 22 to enter the bin 1 downward, the pneumatic discharge valve 28 will restore the pressure in the powder storage bin 22 to normal pressure instantly when it is opened. Since the amount of raw materials that can be stored in the powder storage bin 22 may be small and it is impossible to fill the bin 1 at one time, it is necessary to cycle the processes of sucking and discharging the raw materials multiple times; when the raw materials in the powder storage bin 22 are discharged completely at one time and then sucking is carried out again, the negative pressure inside the powder storage bin 22 will not be enough. At this time, the PLC controller controls the solenoid valve 17 to open, connecting the vacuum pressure stabilizing tank with the powder storage bin 22, and the gas in the powder storage bin 22 enters the vacuum pressure stabilizing tank, thereby quickly supplementing the negative pressure in the negative pressure powder bin 21 to prevent the pressure in the powder storage bin 22 from being too low, so that the next suction can be carried out quickly.

[0108] In the embodiment of the present disclosure, an air pressure sensor is arranged inside the air storage tank 19 of the positive and negative pressure generating device 3 to detect the real-time pressure inside the air storage tank 19 and transmit it to the PLC controller. After the air compressor 10 is started, the pressure inside the air storage tank 19 rises. After the air pressure sensor inside the air storage tank 19 detects the real-time pressure, it transmits it to the PLC controller. After the PLC controller determines that the real-time pressure inside the air storage tank 19 is greater than or equal to 0.5 MPa, it controls the main solenoid valve 18 to open.

[0109] After the vacuum suction machine 11 is started, the pressure inside the air storage tank 19 drops. After the air pressure sensor inside the air storage tank 19 detects the real-time pressure, it transmits it to the PLC controller. After the PLC controller determines that the real-time pressure inside the air storage tank 19 is less than -0.1 MPa, the PLC controller controls the air compressor to start, so that when the air storage tank 19 is connected to the negative pressure powder bin 21, it is maintained in the range of 0 MPa to -0.1 MPa.

[0110] In an embodiment of the present disclosure, a power supply device of a control circuit such as a PLC controller is installed in a rainproof power distribution cabinet, and the power distribution cabinet is fixed on a powder tank truck. The power distribution cabinet and the powder tank truck are flexibly connected through a spring group to reduce the impact on the power distribution cabinet during vehicle operation. A ventilation and heat dissipation module and a preheating and heating module are arranged in the power distribution cabinet to adjust the temperature inside the power distribution cabinet to adapt to the temperature changes in the north in summer and winter and ensure the safety of internal equipment.

[0111] The present disclosure provides a control method for an automatic powder supply system at a fracturing site, including: Step 1: Use a crane to hoist a ton bag of powder so that its bottom is inside a bag-breaking device 4 of the automatic powder supply system at the fracturing site.

[0112] In an embodiment of the present disclosure, during bag breaking, the crane hoists the ton bag of powder above the powder bin 41 and places it downward on the filter screen 43.

[0113] Step 2: The automatic control device controls the bag-breaking device 4 to start and break the ton bag of powder. After bag breaking, the raw materials in the ton bag of powder fall downward into the bag-breaking device 4.

[0114] In an embodiment of the present disclosure, the PLC controller controls the cutting cylinder to start, drives the bag-breaking cutter 42 to move rapidly along the cutter track 45, cuts the bottom of the ton bag of powder, and enables the raw materials in the ton bag of powder to pass through the filter screen 43 downward and enter the bottom of the powder bin 41. At the same time, the PLC controller controls two groups of vibrators 44 to start and alternately generate vibrations at a predetermined vibration frequency and a predetermined vibration amplitude.

[0115] Step 3: The automatic control device controls the positive and negative pressure generating device 3 to start, so that a negative pressure is generated inside the automatic powder supply device 2, and the raw materials in the bag-breaking device 4 are sucked into the inside of the automatic powder supply device 2 through the suction pipe 5.

[0116] In an embodiment of the present disclosure, the PLC controller controls the vacuum feeder 11 to start. When the air pressure sensor in the air storage tank 19 detects that the real-time pressure is less than 0 MPa, the PLC controller controls the electromagnetic main valve 18 and the intake valve 15 to open, and the vacuum feeder 11 sucks the raw materials in the powder bin 41 into the inside of the powder storage bin 22 through the suction pipe 5 via the gas transmission pipeline 6.

[0117] Step 4: The automatic control device controls the automatic powder supply device 2 to start. After moving to a predetermined position, the automatic control device controls the automatic powder supply device 2 to dock with the silo 1.

[0118] In the embodiments of the present disclosure, the PLC controller controls the servo motor to start, driving the mobile trolley 9 to move on the trolley track 8. During the movement of the mobile trolley 9, when passing by each powder bin position sensor, the powder bin position sensor sends a position signal to the PLC controller. When the PLC controller determines that the position signal is sent by the bin position sensor 13 corresponding to the bin 1 that needs to be fed, the PLC controller controls the servo motor to shut down and the mobile trolley 9 stops moving. At this time, the short-circuit 30 position of the powder storage bin 22 corresponds to the tank mouth 12 position of the bin 1.

[0119] The PLC controller controls the lifting cylinder 29 to start, driving the powder storage bin 22 to move downward, so that the short-circuit 30 at the bottom of the powder storage bin 22 is inserted downward into the tank mouth 12 inside the top of the bin 1 to complete the docking.

[0120] Step 5: The automatic control device controls the positive and negative pressure generating device 3 to start, generating a positive pressure inside the automatic powder feeding device 2, and pushing the raw materials inside the automatic powder feeding device 2 into the bin 1 through the positive pressure.

[0121] In the embodiments of the present disclosure, the PLC controller controls the air compressor 10 to start generating gas, which enters the negative pressure powder bin 21 through the gas pipeline 6. The air pressure inside the negative pressure powder bin 21 rises, and the pneumatic discharge valve 28 automatically opens. The controller controls the micro oscillator 25 to open, and the gas inside the negative pressure powder bin 21 moves downward into the powder storage bin 22, pushing the raw materials inside the powder storage bin 22 downward through the connection part of the short-circuit 30 and the tank mouth 12 into the bin 1. After the bin 1 is filled, the PLC controller controls the air compressor 10, the pneumatic discharge valve 28, and the micro oscillator 25 to close.

[0122] The PLC controller controls the lifting cylinder 29 to start, driving the powder storage bin 22 and the negative pressure powder bin 21 to move upward. When the top of the negative pressure powder bin 21 moves to the powder bin reset sensor, the powder bin reset sensor sends a position signal to the PLC controller. The PLC controller then determines that the negative pressure powder bin 21 and the powder storage bin 22 have returned to the initial position, and controls the lifting cylinder 29 to close to complete the reset of the powder storage bin 22. The PLC controller controls the servo motor to start, driving the mobile trolley 9 to move in one end direction of the trolley track 8. When the mobile trolley 9 moves to the initial position sensor, the initial position sensor sends a position signal to the PLC controller, and the PLC controller controls the servo motor to shut down to complete the reset of the mobile trolley 9.

[0123] It can be understood that the above-mentioned various method embodiments mentioned in the present disclosure can be combined with each other to form a combined embodiment without violating the principle logic. Due to space limitations, the present disclosure will not elaborate further.

[0124] Those skilled in the art can understand that in the above-mentioned method of the specific implementation manner, the writing order of each step does not mean a strict execution order and does not impose any limitation on the implementation process. The specific execution order of each step should be determined according to its function and possible internal logic.

[0125] By setting up a bag-breaking device and an automatic powder feeding device, the present disclosure solves the problems of the original rough loading, unloading, storage and feeding methods. When large-pack raw materials were transported by truck to a large-scale fracturing site and then unloaded onto a storage platform by a 25-ton well-site crane, when feeding was required, the well-site crane would then hoist the raw materials on the storage platform to the top of a powder tank truck more than 3 meters high in sequence. The large bag of raw materials would hover at a feeding hopper about 5 meters above the ground. After manual bag-breaking, the raw materials would fall into the powder bin by gravity. This led to problems such as the original rough loading, unloading, storage and feeding work methods, and being affected by various safety factors such as weather, personnel, and cross-operation in a large area during the process, as well as the phenomenon of dust leakage during the feeding process. There were many problems such as high cost in the feeding link, low efficiency, great environmental protection pressure, and large safety hazards in the crane feeding link.

[0126] The present disclosure quickly hoists a large bag of powder to the bag-breaking device at a low position by a crane for mechanical bag-breaking, negative pressure suction, and automatic powder replenishment. Under the automatic control of an automatic control device, each link is more closely connected and the cooperation is smoother. The powder feeding speed has increased from 6 tons per hour in the past to 12 tons per hour now, doubling the powder feeding efficiency of the powder tank truck. One original storage platform has been cancelled, and one well-site crane has been removed; most equipment such as the positive and negative pressure generating device and the control device is arranged on the powder tank truck, saving the relocation and transfer cost of the storage platform and the well-site crane cost for each large well. By cooperating the positive and negative pressure generating device with the automatic powder feeding device, the powder feeding operation mode is simplified, the safety risks in the production link are avoided, the operation process of the auxiliary production link is simplified, the construction efficiency of large-scale fracturing is improved, and the input of production costs such as labor and fuel is indirectly reduced.

[0127] Through the automatic control of the automatic control device for the bag-breaking, feeding, transporting, and feeding processes, the number of on-site operators is reduced, and various operation risks such as cross-operation, slipping of personnel, falling of personnel, high-altitude falling of raw materials, scattering of raw materials, and local pollution are avoided. After upgrading and improving from the equipment hardware and software automatic control program in the later stage, risks such as pressure, dumping, and cutting of personnel are avoided technically, and the construction safety level and environmental protection are greatly improved.

[0128] The embodiments of the present disclosure have been described above. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to technologies in the market, or to enable other ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An automatic powder feeding system for a fracturing site, characterized in that, it includes: a bag breaking device (4), an automatic powder feeding device (2), a positive and negative pressure generating device (3) and an automatic control device; The bag breaking device (4) is used for mechanically breaking the ton bag powder. After the bag is broken, the raw material enters the bag breaking device (4). The bag breaking device (4) transports the raw material to the automatic powder feeding device (2) on the predetermined bin (1) through a suction pipe (5); the bag breaking device (4) includes: a powder bin (41), a bag breaking cutter (42), a driving mechanism, a filter screen (43) and a vibrating feeding mechanism; the top of the powder bin (41) is open, and a horizontal cutter track (45) is arranged near the lower part of the filter screen inside the powder bin (41). The bottom of the bag breaking cutter (42) is connected to the cutter track (45), and the cutter head of the bag breaking cutter (42) faces upward; the bag breaking cutter (42) is connected to the driving mechanism, and the driving mechanism is used to drive the bag breaking cutter (42) to move back and forth along both ends of the cutter track (45); the filter screen (43) is installed inside the powder bin (41), and the position is below the cutter head; the vibrating feeding mechanism is connected to the powder bin (41) and is used to vibrate the powder bin (41); the bottom of the powder bin (41) is connected to the automatic powder feeding device (2) through a suction pipe (5); The automatic powder feeding device (2) is connected to the positive and negative pressure generating device (3). The positive and negative pressure generating device (3) is used to generate negative pressure inside the automatic powder feeding device (2), so that the raw material in the bag breaking device (4) enters the automatic powder feeding device (2), and / or generate positive pressure inside the automatic powder feeding device (2), so that the raw material inside the automatic powder feeding device (2) enters the bin (1); the automatic powder feeding device (2) includes: a traveling mechanism, a negative pressure powder bin (21), a powder storage bin (22), a lifting mechanism and a filter (23); the bottom of the negative pressure powder bin (21) is connected to the top of the powder storage bin (22), and the top of the negative pressure powder bin (21) is connected to the positive and negative pressure generating device (3) through a positive and negative pressure pipeline; the powder storage bin (22) is connected to the bag breaking device (4), and the bottom of the powder storage bin (22) has a short joint (30) for docking with the tank mouth (12) of the bin (1), and a pneumatic discharge valve (28) is installed inside the short joint (30); the lifting mechanism is connected to the powder storage bin (22), and the lifting mechanism is used to drive the powder storage bin (22) to rise or fall; the filter (23) is installed inside the negative pressure powder bin (21) and is used to filter the gas entering the negative pressure powder bin (21) from the powder storage bin (22); the traveling mechanism is connected to the powder storage bin (22) and is used to drive the powder storage bin (22) to move to a predetermined position; The automatic control device is respectively connected to the bag breaking device (4), the automatic powder feeding device (2) and the positive and negative pressure generating device (3). The automatic control device is used to control the automatic powder feeding device (2) to start moving to a predetermined position, control the automatic powder feeding device (2) to dock with the bin (1) and add raw materials to the bin.

2. The automatic powder feeding system for a fracturing site according to claim 1, characterized in that, The vibrating feeding mechanism includes: a vibrator (44); The vibrators (44) are respectively arranged on the side walls of the powder bin (41) in four directions, wherein, two opposite vibrators (44) form a group; The vibrator (44) is connected to the automatic control device, and the vibrator (44) is used to generate vibrations alternately in two groups.

3. The on-site automatic powder feeding system for fracturing according to claim 1, characterized in that, it further includes: a micro oscillator (25); The micro oscillator (25) is installed on the side wall of the powder storage bin (22) and is used to generate vibrations; and / or; A sealing mechanism is installed on the short circuit (30), and the sealing mechanism is used to seal the position where the short circuit (30) is docked with the bin (1).

4. The on-site automatic powder feeding system for fracturing according to claim 1, characterized in that, it further includes: a backblower (27); The backblower (27) is installed near the top inside the negative pressure powder bin (21), and the backblower (27) is used to clean the raw materials on the filter (23).

5. The on-site automatic powder feeding system for fracturing according to claim 1, characterized in that, The traveling mechanism includes: a traveling equipment frame (7), a trolley track (8), a moving trolley (9) and a servo motor; The trolley track (8) is arranged on the top of the traveling equipment frame (7), and the trolley track (8) is above the bin (1), and the position of the trolley track (8) corresponds to the position of the top tank opening (12) of the bin (1); The moving trolley (9) is on the trolley track (8), and the powder storage bin (22) is fixed on the moving trolley (9); The servo motor is connected to the moving trolley (9), and the servo motor is used to drive the moving trolley (9) to move back and forth on the trolley track (8).

6. The on-site automatic powder feeding system for fracturing according to any one of claims 1-5, characterized in that, The automatic control device includes: a position sensing unit, a pneumatic detection and control unit and a PLC controller; The PLC controller is respectively connected to the position sensing unit and the pneumatic detection and control unit; The position sensing unit is connected to the bin (1), and the position sensing unit is used to detect the real-time position of the automatic powder feeding device (2) and transmit it to the PLC controller; The pneumatic detection and control unit is respectively connected to the bag breaking device (4), the automatic powder feeding device (2) and the positive and negative pressure generating device (3), and the pneumatic monitoring and control unit is used to detect and adjust the real-time pressure inside the bag breaking device (4), the automatic powder feeding device (2) and the positive and negative pressure generating device (3).

7. The on-site automatic powder feeding system for fracturing according to claim 6, characterized in that, The position sensing unit includes: a bin position sensor (13); The bin position sensor (13) is installed on the top of the bin (1), and the bin position sensor (13) is used to send a position signal to the PLC controller when it detects that the automatic powder feeding device (2) reaches the position of the bin position sensor (13). The air pressure detection and control unit includes: an air pressure sensor, a vacuum relief valve (14), an intake valve (15), a gas replenishing control valve (16), and a vacuum pressure stabilizing tank; The air pressure sensor is installed inside the automatic powder feeding device (2) to detect the real-time air pressure value inside the automatic powder feeding device (2) and transmit it to the PLC controller; The vacuum relief valve (14) is installed at one end of the material suction pipe (5) close to the bag breaking device (4), and the intake valve (15) is connected to the side wall of the material suction pipe (5); The automatic powder feeding device (2) is respectively connected to the gas replenishing control valve (16) and the vacuum pressure stabilizing tank.

8. The control method of the on-site automatic powder feeding system for fracturing according to claim 1, characterized in that, it includes: using a crane to hoist the ton bag powder so that its bottom is inside the bag breaking device (4) of the on-site automatic powder feeding system for fracturing; the automatic control device controls the bag breaking device (4) to start and break the ton bag powder. After bag breaking, the raw materials in the ton bag powder fall downward into the bag breaking device (4); the automatic control device controls the positive and negative pressure generating device (3) to start, so that a negative pressure is generated inside the automatic powder feeding device (2), and the raw materials in the bag breaking device (4) are sucked into the automatic powder feeding device (2) through the material suction pipe (5); the automatic control device controls the automatic powder feeding device (2) to start. After moving to a predetermined position, the automatic control device controls the automatic powder feeding device (2) to complete docking with the silo (1); the automatic control device controls the positive and negative pressure generating device (3) to start, so that a positive pressure is generated inside the automatic powder feeding device (2), and the raw materials inside the automatic powder feeding device (2) are pushed into the silo (1) by the positive pressure.

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