A powder material buffer container and a powder material conveying system

Abstract

The present invention discloses a powder material buffer container and a powder material conveying system, which relates to the technical field of conveying devices, and is used to solve the problem that the existing buffer container cannot keep the depth of the suction pipe inserted into the proppant at a set depth, which affects the proppant conveying efficiency. The system includes a buffer container, a discharge tank, a suction pipe, a fan and an air duct. The buffer container includes a body and a partition. The body has a accommodating cavity. The partition divides the accommodating cavity into a filling area and a suction area arranged in a horizontal direction. A connecting channel is provided between the filling area and the suction area. The connecting channel is located below the upper side of the partition. The suction area is used for inserting the suction pipe; the discharge tank is provided with a feed port, a discharge port and an air outlet, and a discharge valve is provided at the discharge port; one end of the suction pipe is connected to the feed port of the discharge tank, and the other end is inserted into the suction area of ​​the buffer container; one end of the air duct is connected to the fan, and the other end is connected to the air outlet of the discharge tank.

Description

Technical Field

[0001] The present invention relates to the technical field of conveying devices, and in particular to a powder material buffer container and a powder material conveying system. Background Art

[0002] Oil and gas field fracturing operations require the use of proppants, which usually need to be first placed in special storage tanks and then added from the storage tanks to downstream demand equipment during operations. Proppants are usually purchased in bagged form, and a powder material conveying system is generally used to add bagged proppants to storage tanks.

[0003] like Figure 1 As shown, the powder material conveying system in the prior art includes a buffer container 101, a suction pipe 105, a discharge tank 102, an air duct 106, a filter device 103, an air duct 106 and a fan 104 which are connected in sequence; when in use, the operator pours the bagged proppant 107 into the buffer container 101, starts the fan 104, and the fan 104 sucks air to form a negative pressure in the air duct 106, the discharge tank 102 and the suction pipe 105, and utilizes the negative pressure suction principle to deliver the proppant in the buffer container 101 into the discharge tank 102; when in use, the discharge tank 102 is installed above the storage tank, and a discharge port 108 is provided at the lower part of the discharge tank 102. When the proppant in the discharge tank 102 reaches a certain amount, the discharge port 108 can be opened to discharge the proppant into the storage tank.

[0004] In the above-mentioned powder material conveying system, the suction pipe 105 is inserted into the buffer container 101 to suck the proppant. When the fan 104 provides the same wind force, the depth of the suction pipe 105 inserted into the proppant is different, and the efficiency of conveying the proppant by the powder material conveying system is also different. Usually, when in use, multiple tests will be carried out to find that when the suction pipe 105 is inserted into the proppant to a certain depth, a higher conveying efficiency can be obtained, and then the work is carried out based on the specific depth.

[0005] However, as the proppant is transported, the proppant in the buffer container 101 will gradually decrease, and the depth of the suction pipe 105 inserted into the proppant will gradually decrease, which will affect the transportation efficiency of the proppant. In this case, even if the bagged proppant 107 is poured into the buffer container 101, because the speed of pouring the bagged proppant 107 is difficult to be the same as the speed of transporting the proppant by the powder material conveying system, the depth of the suction pipe 105 inserted into the proppant will still be changed, which will still affect the transportation efficiency of the proppant. Summary of the invention

[0006] The object of the present invention is to provide a powder material buffer container to solve the problem that the existing buffer container cannot maintain the depth of the suction pipe inserted into the proppant at a set depth, thus affecting the proppant conveying efficiency; the object of the present invention is also to provide a powder material conveying system using the above-mentioned powder material buffer container.

[0007] In order to achieve the above-mentioned purpose, the powder material buffer container provided by the present invention adopts the following technical scheme:

[0008] In some embodiments of the present application, the powder material buffer container includes:

[0009] A body having a receiving cavity therein, the body comprising a bottom wall and side walls;

[0010] The partition is installed in the body to divide the accommodating chamber into a filling area and a suction area arranged in the horizontal direction. A connecting channel is provided between the filling area and the suction area. The connecting channel is located below the upper side of the partition. The filling area is used for operators to fill powder materials. When the surface of the powder material in the filling area exceeds the connecting channel, the powder material in the filling area can flow into the suction area through the connecting channel. The suction area is used for the suction pipe to be inserted.

[0011] The accommodating chamber of the powder material buffer container is divided into a filling area and a suction area arranged in the horizontal direction by a partition, and a connecting channel is provided between the filling area and the suction area, and the connecting channel is arranged under the upper side of the partition. When the operator fills the powder material into the filling area, affected by the characteristics of the powder material itself (friction between the powder materials, friction between the powder material and the container body, and flow performance of the powder material, etc.), as long as the overall height of the powder material filled in the filling area is higher than the upper edge of the connecting channel, the powder material flowing into the suction area will form a relatively stable material surface, and the material surface can be maintained at a relatively stable height as a whole; After the suction pipe is inserted into the powder material in the suction area, while the suction pipe sucks the powder material, the powder material in the filling area will also flow into the suction area at the same time, so that the material surface of the powder material in the suction area can still be maintained at a relatively stable height as a whole, and the depth of the suction pipe inserted into the powder material is relatively constant, thereby making the material conveying efficiency of the powder material conveying system using the powder material buffer container remain constant. In this way, it is only necessary to determine the depth of the suction pipe inserted into the powder material when the conveying efficiency of the powder material conveying system is higher, and then insert the suction pipe to this depth, thereby ensuring that the powder material can be conveyed continuously and efficiently.

[0012] In some embodiments of the present application, a communication channel is formed between the lower side of the partition and the bottom wall of the vessel body, so that the powder material in the filling area can flow into the suction area more conveniently.

[0013] In some embodiments of the present application, the lower side of the partition is a plane, and there is a gap between the lower side of the partition and the bottom wall of the body, and the gap forms a connecting channel. This arrangement makes it easier for the powder material in the filling area to flow into the suction area; in addition, the structure of this partition is relatively simple and the processing difficulty is relatively low.

[0014] In some embodiments of the present application, a cover plate is provided in the suction area to prevent the powder material from rising upwards, the cover plate is arranged at a position higher than the connecting channel, and a through hole is provided on the cover plate for the suction pipe to pass through. This arrangement can prevent the powder material in the suction area from rising upwards when being sucked by the suction pipe, thereby causing environmental pollution.

[0015] In some embodiments of the present application, a guide structure is provided on the cover plate corresponding to the through hole, and the guide structure is used to guide the suction pipe to be inserted into the suction area along the up-down direction. This arrangement ensures that the suction pipe is inserted into the suction area along the up-down direction, thereby facilitating the control of the depth of the suction pipe inserted into the powder material.

[0016] In some embodiments of the present application, the guide structure is a guide cylinder integrally formed with the cover plate, and the guide cylinder is coaxially arranged with the through hole. With such an arrangement, the guide structure is easy to implement and the difficulty of processing the cover plate can be reduced.

[0017] In some embodiments of the present application, the side wall of the body corresponding to the filling area is at least partially inclined, and the angle between the inclined side wall and the bottom wall is an obtuse angle. This arrangement makes it easier for operators to add powder materials into the filling area and also makes it easier for the powder materials to be evenly gathered in the filling area.

[0018] In some embodiments of the present application, a fluidizer is provided at the bottom of the suction zone, the fluidizer is connected to an air source, and the fluidizer is used to make the powder material in the suction zone obtain an initial velocity along the suction direction of the suction pipe before being sucked away by the suction pipe. This arrangement makes it easier for the powder material to be sucked away by the suction pipe.

[0019] The powder material conveying system provided by the present invention adopts the following technical solutions:

[0020] In some embodiments of the present application, the powder material conveying system includes:

[0021] The buffer container comprises a body and a partition, the body has a containing cavity, the body comprises a bottom wall and a side wall, the partition is installed in the body to separate the containing cavity into a filling area and a suction area arranged in a horizontal direction, a connecting passage is provided between the filling area and the suction area, the connecting passage is located below the upper side of the partition, the filling area is used for operators to fill powder materials, when the surface of the powder materials in the filling area exceeds the connecting passage, the powder materials in the filling area can flow into the suction area through the connecting passage, and the suction area is used for the suction pipe to be inserted;

[0022] The unloading tank is provided with a feed inlet, a discharge port and an air outlet, and a discharge valve is provided at the discharge port;

[0023] A suction pipe, one end of which is connected to the feed port of the discharge tank, and the other end of which is inserted into the suction area of ​​the buffer container;

[0024] Fan;

[0025] The air duct has one end connected to the fan and the other end connected to the air outlet of the discharge tank.

[0026] In the above-mentioned powder conveying system, the fan sucks air to form a negative pressure suction channel among the air duct, the discharge tank and the suction pipe, which is used to suck the powder material in the buffer container into the discharge tank. In addition, the accommodating chamber of the buffer container is divided into a filling area and a suction area arranged in the horizontal direction by a partition, and a connecting channel is provided between the filling area and the suction area. The connecting channel is provided under the upper side surface of the partition. When the operator adds powder material to the filling area, affected by the characteristics of the powder material itself (friction between the powder materials, friction between the powder materials and the device body, and flowability of the powder material, etc.), as long as the overall height of the powder material filled in the filling area is higher than the upper edge of the connecting channel, the powder material flowing into the suction area will form a relatively stable material surface, and the material surface as a whole can be maintained at a relatively stable A certain height; after the suction pipe is inserted into the powder material in the suction area, while the suction pipe sucks the powder material, the powder material in the filling area will also flow into the suction area at the same time, so that the material surface of the powder material in the suction area can still be maintained at a relatively stable height as a whole, and the depth of the suction pipe inserted into the powder material is relatively constant, thereby making the efficiency of the powder material conveying system to convey materials constant. In this way, it is only necessary to determine the depth at which the suction pipe is inserted into the powder material when the conveying efficiency of the powder material conveying system is high, and then insert the suction pipe to this depth, thereby ensuring that the powder material can be conveyed continuously and efficiently.

[0027] In some embodiments of the present application, a communication channel is formed between the lower side of the partition and the bottom wall of the vessel body, so that the powder material in the filling area can flow into the suction area more conveniently.

[0028] In some embodiments of the present application, the lower side of the partition is a plane, and there is a gap between the lower side of the partition and the bottom wall of the body, and the gap forms a connecting channel. This arrangement makes it easier for the powder material in the filling area to flow into the suction area; in addition, the structure of this partition is relatively simple and the processing difficulty is relatively low.

[0029] In some embodiments of the present application, a cover plate is provided in the suction area to prevent the powder material from rising upwards, the cover plate is arranged at a position higher than the connecting channel, and a through hole is provided on the cover plate for the suction pipe to pass through. This arrangement can prevent the powder material in the suction area from rising upwards when being sucked by the suction pipe, thereby causing environmental pollution.

[0030] In some embodiments of the present application, a guide structure is provided on the cover plate corresponding to the through hole, and the guide structure is used to guide the suction pipe to be inserted into the suction area along the up-down direction. This arrangement ensures that the suction pipe is inserted into the suction area along the up-down direction, thereby facilitating the control of the depth of the suction pipe inserted into the powder material.

[0031] In some embodiments of the present application, the guide structure is a guide cylinder integrally formed with the cover plate, and the guide cylinder is coaxially arranged with the through hole. With such an arrangement, the guide structure is easy to implement and the difficulty of processing the cover plate can be reduced.

[0032] In some embodiments of the present application, the side wall of the body corresponding to the filling area is at least partially inclined, and the angle between the inclined side wall and the bottom wall is an obtuse angle. This arrangement makes it easier for operators to add powder materials into the filling area and also makes it easier for the powder materials to be evenly gathered in the filling area.

[0033] In some embodiments of the present application, a fluidizer is provided at the bottom of the suction zone, the fluidizer is connected to an air source, and the fluidizer is used to make the powder material in the suction zone obtain an initial velocity along the suction direction of the suction pipe before being sucked away by the suction pipe. This arrangement makes it easier for the powder material to be sucked away by the suction pipe.

[0034] In some embodiments of the present application, two unloading tanks are provided, and a feed valve is provided at the feed port of the unloading tank, and an air outlet valve is provided at the air outlet of the unloading tank; the feed ports of the two unloading tanks are separately connected to the suction pipe, and the air outlets of the two unloading tanks are separately connected to the air duct. With this arrangement, the two unloading tanks can be used one by one. If the two unloading tanks are respectively the first unloading tank and the second unloading tank, the feed valve and the air outlet valve corresponding to the first unloading tank can be opened first, and the unloading valve corresponding to the first unloading tank can be closed. At the same time, the unloading valve, the air outlet valve and the feed valve corresponding to the second unloading tank can be closed, and then the fan can be started. Then, the powder material conveying system starts to accumulate powder material in the first unloading tank. After the powder material in the first unloading tank accumulates to a certain extent, the feed valve and the air outlet valve corresponding to the first unloading tank can be closed, and the fan can be opened. When the air outlet valve and the feed valve corresponding to the second unloading tank are opened, the powder material conveying system starts to accumulate powder material in the second unloading tank. During this process, the unloading valve corresponding to the first unloading tank can be opened at the same time to release the powder material in the first unloading tank. After the powder material in the second unloading tank accumulates to a certain extent, the material can be accumulated in the first unloading tank again, and the powder material in the second unloading tank can be released at the same time. This process is repeated to ensure that the powder material conveying system can work continuously, thereby improving the conveying efficiency of the powder material conveying system.

[0035] In some embodiments of the present application, a baffle plate is provided in the discharge tank, and the baffle plate is used to block the powder material from flowing with the air flow to the air outlet of the discharge tank. This arrangement makes it easier for the powder material entering the discharge tank through the feed port to fall downward, and prevents the powder material from entering the air duct with the air flow.

[0036] In some embodiments of the present application, the baffle plate is fixed on the top wall of the discharge tank, and the baffle plate is arranged between the feed port and the air outlet.

[0037] In some embodiments of the present application, a filter device is provided in the air flow channel between the discharge tank and the fan, so as to prevent some dust from entering the fan along with the air flow and causing damage to the fan.

[0038] In some embodiments of the present application, at least part of the suction pipe is a flexible pipe section, and / or at least part of the air duct is a flexible pipe section. This arrangement facilitates the installation and placement of the powder material conveying system, and will not increase the difficulty of installation due to the limitations of the suction pipe structure and the air duct structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0040] Figure 1 It is a structural schematic diagram of a powder material conveying system provided in the background technology;

[0041] Figure 2 This is a schematic diagram of the use status of Example 1 of the powder material conveying system provided by the present invention;

[0042] Figure 3 It is a schematic diagram of the coordination between the buffer tank and the suction pipe in Example 1 of the powder material conveying system provided by the present invention;

[0043] Figure 4 is a top view of the buffer tank in Example 1 of the powder material conveying system provided by the present invention;

[0044] Figure 5 It is a schematic diagram of the coordination between the buffer tank and the suction pipe in Example 2 of the powder material conveying system provided by the present invention.

[0045] In the attached drawings, 101-buffer container, 102-discharging tank, 103-filtering device, 104-fan, 105-suction pipe, 106-air duct, 107-bag proppant, 108-discharging port; 1-first discharging tank, 2-second discharging tank, 3-buffer tank, 4-filtering device, 5-fan, 6-motor, 7-first feed port, 8-first air outlet, 9-first discharging port, 10-first feed valve, 11-first air outlet valve, 12-first discharging valve, 13-second feed port, 14- -second gas outlet, 15-second discharge port, 16-second feed valve, 17-second gas outlet valve, 18-second discharge valve, 19-storage tank, 20-first air duct, 21-second air duct, 22-suction pipe, 24-left side wall, 25-right side wall, 26-bottom wall, 27-partition, 28-filling area, 29-suction area, 30-proppant, 31-sand surface, 32-cover plate, 33-guide cylinder, 34-fluidizer, 35-gas source, 36-gas pipe, 37-front side wall, 38-rear side wall. DETAILED DESCRIPTION

[0046] 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.

[0047] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0048] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0049] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. It can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] Embodiment 1 of the powder material conveying system provided by the present invention:

[0051] This embodiment 1 is described by taking the filling of proppant into a storage tank as an example, but the powder material conveying system provided by the present invention is not limited to conveying proppant, and is not limited to filling of powder material into a storage tank.

[0052] like Figure 2 As shown, the powder material conveying system includes a first discharge tank 1, a second discharge tank 2, a buffer tank 3, a filter device 4, a fan 5 and a motor 6. The fan 5 is a Roots blower, and the motor 6 is used to drive the fan 5. In some other embodiments, the motor 6 can also be replaced by an engine, a hydraulic motor, etc., which can all be used. The buffer tank 3 is a buffer container in the powder material conveying system. In other embodiments, the buffer container can also be a buffer box, a buffer barrel, etc., which can all be used.

[0053] like Figure 2As shown, a first feed port 7 and a first air outlet 8 are provided at the top of the first unloading tank 1, a first discharge port 9 is provided at the bottom of the first unloading tank 1, a first feed valve 10 for opening and closing the first feed port 7 is installed at the first feed port 7, a first air outlet valve 11 for opening and closing the first air outlet 8 is provided at the first air outlet 8, and a first discharge valve 12 for opening and closing the first discharge port 9 is provided at the first discharge port 9.

[0054] like Figure 2 As shown, a second feed port 13 and a second air outlet 14 are provided at the top of the second unloading tank 2, a second discharge port 15 is provided at the bottom of the second unloading tank 2, a second feed valve 16 for opening and closing the second feed port 13 is installed at the second feed port 13, a second air outlet valve 17 for opening and closing the second air outlet 14 is provided at the second air outlet 14, and a second discharge valve 18 for opening and closing the second discharge port 15 is installed at the second unloading port 15.

[0055] like Figure 2 As shown, the first unloading tank 1 and the second unloading tank 2 are both fixedly installed above the storage tank 19, and the first unloading port 9 of the first unloading tank 1 and the second unloading port 15 of the second unloading tank 2 are both connected to the inlet of the storage tank 19, so that when the first unloading valve 12 and the second unloading valve 18 are opened, the proppant in the first unloading tank 1 and the second unloading tank 2 can be unloaded into the storage tank 19.

[0056] like Figure 2 As shown, the powder material conveying system also includes a first air duct 20 and a second air duct 21. One end of the first air duct 20 is connected to the air inlet of the filter device 4, and the other end is connected to the first air outlet 8 of the first discharge tank 1 and the second air outlet 14 of the second discharge tank 2 through a tee. One end of the second air duct 21 is connected to the air outlet of the filter device 4, and the other end is connected to the air inlet of the fan 5. The filter device 4 in this embodiment 1 is a cyclone dust collector. In other embodiments, it can also be an electrostatic precipitator or a bag dust collector, etc., which can be used. The first air duct 20 and the second air duct 21 together constitute the air duct in the powder material conveying system.

[0057] like Figure 2 As shown, the powder material conveying system also includes a suction pipe 22, one end of which is inserted into the buffer tank 3, and the other end is connected to the first feed port 7 of the first discharge tank 1 and the second feed port 13 of the second discharge tank 2 through a tee.

[0058] like Figure 3 and Figure 4As shown, the buffer tank 3 includes a body, the upper part of which is open, and the body includes a front side wall 37, a rear side wall 38, a left side wall 24, a right side wall 25 and a bottom wall 26. The front side wall 37, the rear side wall 38, the left side wall 24, the right side wall 25 and the bottom wall 26 together form a accommodating cavity, wherein the left side wall 24 is inclined from top to bottom and from left to right so that the angle between the left side wall 24 and the bottom wall 26 is an obtuse angle.

[0059] like Figure 3 and Figure 4 As shown, the buffer tank 3 also includes a partition 27, which is a flat plate structure. The front side of the partition 27 is welded and fixed to the front side wall 37 of the body, and the rear side of the partition 27 is welded and fixed to the rear side wall 38 of the body. The partition 27 divides the accommodating chamber into a filling area 28 and a suction area 29, and the filling area 28 and the suction area 29 are arranged and distributed in the left and right directions; the lower side of the partition 27 is a plane, and the lower side of the partition 27 is spaced from the bottom wall 26 of the body, and the space forms a connecting channel connecting the filling area 28 and the suction area 29.

[0060] The filling area 28 is used for operators to add proppant 30. Part of the proppant 30 added to the filling area 28 will flow into the suction area 29 through the connecting channel. Affected by the characteristics of the proppant 30 itself (friction between the proppant particles, friction between the proppant particles and the device body, and the flowability of the proppant, etc.), when the surface of the proppant 30 in the filling area 28 is higher than the lower side of the partition 27, the proppant 30 in the suction area 29 will form a "relatively stable" sand surface 31. The "relative stability" mentioned here means continuing to add proppant 30 to the filling area 28. As long as the surface of the proppant 30 in the filling area 28 is higher than the lower side of the partition 27, the overall height change of the sand surface 31 in the suction area 29 is very small, and the shape change is also very small.

[0061] When the above-mentioned relatively stable sand surface 31 is obtained, the suction pipe 22 is inserted into the proppant 30 in the suction area 29 to ensure that the depth of the suction pipe 22 inserted into the proppant 30 remains relatively constant; even if the suction pipe 22 continues to suck away the proppant 30 in the suction area 29, the proppant 30 in the filling area 28 will be quickly replenished into the suction area 29, so that the sand surface 31 of the proppant 30 in the suction area 29 can still remain relatively stable, that is, the depth of the suction pipe 22 inserted into the proppant 30 can still remain relatively constant.

[0062] To prevent the proppant 30 from being lifted upward during the suction pipe 22 sucking the proppant 30, Figure 3 and Figure 4As shown, a cover plate 32 is provided in the suction area 29, and the height of the cover plate 32 is higher than the lower side of the partition 27. The four sides of the cover plate 32 are respectively welded and fixed to the front side wall 37 of the body, the rear side wall 38 of the body, the right side wall 25 of the body and the partition 27; a through hole is provided on the cover plate 32 for the suction pipe 22 to pass through, and a guide cylinder 33 is integrally formed at the through hole of the cover plate 32. The axis of the guide cylinder 33 extends in the up-down direction and is coaxially arranged with the through hole. The guide cylinder 33 guides the suction pipe 22 so that the suction pipe 22 can only be inserted into the proppant 30 in the suction area 29 in the up-down direction. The guide cylinder 33 constitutes a guide structure on the cover plate 32.

[0063] When the powder material conveying system is in use, the first discharge tank 1 and the second discharge tank 2 are fixedly installed above the storage tank 19, and the first discharge port 9 and the second discharge port 15 are connected to the inlet of the storage tank 19, and then the first air duct 20, the second air duct 21 and the suction pipe 22 are used to connect the first discharge tank 1, the second discharge tank 2, the buffer tank 3, the filter device 4 and the fan 5, and the suction pipe 22 is inserted into the proppant 30 in the suction area 29 (before the powder material conveying system works, some proppant 30 is first added to the buffer tank 3, and a sand surface 31 of the proppant 30 is formed in the suction area 29), thereby completing the installation of the powder material conveying system.

[0064] Start the motor 6, open the first feed valve 10 and the first outlet valve 11 of the first unloading tank 1, close the first unloading valve 12 of the first unloading tank 1, and close the second feed valve 16, the second outlet valve 17 and the second unloading valve 18 of the second unloading tank 2 at the same time, and the first air duct 20, the second air duct 21, the first unloading tank 1 and the suction pipe 22 form a negative pressure suction channel, so that the proppant 30 in the buffer tank 3 is gradually sucked into the first unloading tank 1; in this process, the operator according to the filling area 2 8. The amount of proppant 30 in the filling area 28 is used to select whether to add proppant 30, as long as the lowest surface of the proppant 30 in the filling area 28 is higher than the lower side of the partition 27; when a set amount of proppant 30 is accumulated in the first unloading tank 1, the first feed valve 10 and the first air outlet valve 11 of the first unloading tank 1 are closed, and the second feed valve 16 and the second air outlet valve 17 of the second unloading tank 2 are opened, and the first air duct 20, the second air duct 21, the second unloading tank 2 and the suction pipe 22 form a negative pressure suction channel, and the powder is The material conveying system starts to deliver the proppant 30 in the buffer tank 3 to the second unloading tank 2; during the process of accumulating the proppant 30 in the second unloading tank 2, the first unloading valve 12 of the first unloading tank 1 is opened to unload the proppant 30 in the first unloading tank 1 into the storage tank 19, and after all the proppant 30 in the first unloading tank 1 is unloaded into the storage tank 19, the first unloading valve 12 is closed; when a set amount of proppant 30 accumulates in the second unloading tank 2, the second feed valve 16 and the second outlet valve 17 are closed, The first feed valve 10 and the first air outlet valve 11 are opened at the same time, so that the powder material conveying system starts to convey the proppant 30 into the first unloading tank 1 again. During the process of accumulating the proppant 30 in the first unloading tank 1, the second unloading valve 18 is opened to discharge the proppant 30 in the second unloading tank 2 into the storage tank 19. After all the proppant 30 in the second unloading tank 2 is discharged into the storage tank 19, the second unloading tank 2 is closed; this process is repeated until a sufficient amount of proppant 30 is loaded into the storage tank 19.

[0065] In order to reduce the proppant 30 with smaller particles and dust entering the first air duct 20 with the air flow, a baffle plate (not shown in the figure) is provided in the first unloading tank 1 and the second unloading tank 2. The baffle plate is fixedly connected to the top wall of the corresponding unloading tank, and the baffle plate is arranged between the feed port and the gas outlet of the corresponding unloading tank, so that the proppant 30 entering the unloading tank from the feed port is blocked in the process of flowing to the gas outlet with the air flow, and the proppant 30 falls downward under the action of its own gravity after hitting the baffle plate. The material of the baffle plate is selected from a material with higher hardness, such as tungsten, manganese, titanium alloy, etc., and stainless steel can also be selected, and a wear-resistant coating is applied on the surface of the stainless steel, and the coating can be aluminum oxide, titanium carbide, etc.

[0066] In order to facilitate the arrangement and installation of the powder material conveying system at the construction site, part of the pipe section of the suction pipe 22 can be set as a hose (such as a rubber hose, etc.). Of course, it should be noted that in order to ensure that the suction pipe 22 can be stably inserted into the proppant 30 to a certain depth, the end of the suction pipe 22 close to the buffer tank 3 should be set as a hard pipe. Part of the pipe sections of the first air duct 20 and the second air duct 21 can also be set as a hose (such as a rubber hose, etc.), or the entire first air duct 20 and the entire second air duct 21 can be hoses, which can be used.

[0067] Embodiment 2 of the powder material conveying system provided by the present invention:

[0068] The difference from Example 1 is that Figure 5 As shown, the buffer tank 3 is also equipped with a fluidizer 34, which is arranged at the bottom of the suction area 29, and when in use, the proppant 30 in the suction area 29 can bury the fluidizer 34. At the same time, when the suction pipe 22 is inserted into the proppant 30, the fluidizer 34 is located below the suction pipe 22; the buffer tank 3 is also equipped with an air source 35 corresponding to the fluidizer 34, and the fluidizer 34 is connected to the air source 35 through an air pipe 36, and the air pipe 36 passes through the right side wall 25 of the device body and extends into the suction area 29. The right side wall 25 of the device body is provided with a through hole for the air pipe 36 to pass through, and the air pipe 36 is sealed with the right side wall 25 of the device body.

[0069] The fluidizer 34 is provided to enable the proppant 30 in the suction zone 29 to obtain an initial upward velocity before being sucked away by the suction pipe 22 , so that the proppant 30 is more easily sucked away by the suction pipe 22 .

[0070] In the above-mentioned embodiments 1 and 2, the communication channel is formed by the gap between the lower side of the partition and the bottom wall of the body. In other embodiments, the lower side of the partition may also be fitted with the bottom wall, and then a through hole is opened on the partition, and the through hole can form the communication channel; when the lower side of the partition is fitted with the bottom wall, a groove may be formed by being recessed upward from the lower side of the partition, and the groove can also form the communication channel.

[0071] In the above-mentioned Embodiments 1 and 2, a cover plate is provided in the buffer tank, and a guide structure is provided on the cover plate, and the guide structure is a guide cylinder integrally formed with the cover plate. In other embodiments, the guide cylinder can also be made separately and then welded and fixed to the cover plate; the guide structure can also be other structural forms, such as a plurality of guide columns arranged around the through hole, the axis of each guide column extending in the up-down direction, and a plurality of guide columns are used together to limit the suction pipe to be inserted into the proppant only in the up-down direction, which can also be used; of course, the guide structure can also be omitted on the cover plate, which can also be used; in some embodiments, the buffer tank can also be omitted on the cover plate, which can also be used.

[0072] In the above-mentioned embodiments 1 and 2, the left side wall of the body is arranged to be inclined from top to bottom and from outside to inside. In other embodiments, the left side wall can also be arranged vertically and can also be used; the front side wall part and the rear side wall part corresponding to the filling area can also be arranged to be inclined from top to bottom and from outside to inside and can also be used.

[0073] In the above-mentioned embodiment 1 and embodiment 2, two buffer tanks are provided. In other embodiments, only one buffer tank may be provided, which can also be used.

[0074] In the above-mentioned embodiment 1 and embodiment 2, a baffle plate is provided in the discharge tank. In other embodiments, the baffle plate may not be provided in the discharge tank, and the same can be used.

[0075] In the above-mentioned embodiment 1 and embodiment 2, a filter device is provided between the first air duct and the second air duct. In other embodiments, two filter devices may be provided, and the two filter devices are provided between the first air duct and the two discharge tanks respectively, and can also be used; the filter device may also be provided between the second air duct and the fan, and can also be used; of course, the filter device may also not be provided, and can also be used.

[0076] In the above-mentioned embodiment 1 and embodiment 2, the suction pipe, the first air duct and the second air duct all have a part of flexible pipe section. In other embodiments, the suction pipe, the first air duct and the second air duct can also be hard pipes, which can also be used.

[0077] The present invention further provides a powder material buffer container, which has the same structure as the buffer container in the above-mentioned embodiment of the powder material conveying system, and will not be described in detail here.

[0078] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0079] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope described in the claims.

Claims

1. A powder material buffer container, characterized in that: include: A body, wherein the body has a containing cavity, and the body comprises a bottom wall and a side wall; A partition is installed in the body to divide the accommodating chamber into a filling area and a suction area arranged in the horizontal direction. A connecting passage is provided between the filling area and the suction area. The connecting passage is located below the lower side of the partition. The filling area is used for operators to fill powder materials. When the surface of the powder materials in the filling area exceeds the connecting passage, the powder materials in the filling area can flow into the suction area through the connecting passage. A cover plate for preventing the powder materials from rising upward is provided in the suction area. The setting position of the cover plate is higher than the connecting passage. The cover plate is provided with a through hole. A suction pipe, the suction pipe is passed through the through hole, and the suction area is used for inserting the suction pipe; The fluidizer is arranged at the bottom of the suction zone and below the suction pipe.

2. The powder material buffer container according to claim 1, characterized in that: The communicating channel is formed between the lower side of the partition and the bottom wall of the container body.

3. The powder material buffer container according to claim 2, characterized in that: The lower side surface of the partition is a plane, and there is a gap between the lower side surface of the partition and the bottom wall of the body, and the gap forms the connecting channel.

4. The powder material buffer container according to claim 1, characterized in that: A guide structure is provided on the cover plate corresponding to the through hole, and the guide structure is used to guide the suction pipe to be inserted into the suction area along the up and down direction.

5. The powder material buffer container according to claim 4, characterized in that: The guide structure is a guide cylinder formed integrally with the cover plate, and the guide cylinder is coaxially arranged with the through hole.

6. The powder material buffer container according to claim 1, 2 or 3, characterized in that: The side wall of the body corresponding to the filling area is at least partially inclined, and the angle between the inclined side wall and the bottom wall is an obtuse angle.

7. The powder material buffer container according to claim 1, 2 or 3, characterized in that: The fluidizer is connected to an air source and is used to enable the powder material in the suction zone to obtain an initial velocity along the suction direction of the suction pipe before being sucked away by the suction pipe.

8. A powder material conveying system, characterized in that: include: A buffer container, wherein the buffer container is a powder material buffer container as described in any one of claims 1 to 7; A discharge tank is provided with a feed inlet, a discharge outlet and an air outlet, and a discharge valve is provided at the discharge outlet; One end of the suction pipe is connected to the feed port of the discharge tank, and the other end is inserted into the suction area of ​​the buffer container; Fan; An air duct, one end of which is connected to the fan, and the other end of which is connected to the air outlet of the discharge tank.

9. The powder material conveying system according to claim 8, characterized in that: There are two unloading tanks, a feed valve is provided at the feed port of the unloading tank, and an air outlet valve is provided at the air outlet of the unloading tank; the feed ports of the two unloading tanks are separately connected to the suction pipe, and the air outlets of the two unloading tanks are separately connected to the air duct.

10. The powder material conveying system according to claim 8 or 9, characterized in that: A baffle plate is arranged in the discharge tank, and the baffle plate is used to block the powder material from flowing toward the air outlet of the discharge tank along with the air flow.

11. The powder material conveying system according to claim 10, characterized in that: The baffle plate is fixed on the top wall of the discharge tank, and the baffle plate is arranged between the feed port and the gas outlet.

12. The powder material conveying system according to claim 8 or 9, characterized in that: A filtering device is provided in the air flow channel between the discharge tank and the fan.

13. The powder material conveying system according to claim 8 or 9, characterized in that: At least part of the pipe section of the suction pipe is a flexible pipe section, and / or at least part of the pipe section of the air duct is a flexible pipe section.

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