Shale gas fracturing sand feeding device and sand conveying system

Abstract

The present disclosure provides a shale gas fracturing sand feeding device and sand conveying system, the shale gas fracturing sand feeding device comprises a feeding hopper, and a feeding assembly, the feeding assembly comprises a collision-proof plate, a cutter and a driving mechanism, the collision-proof plate has opposite first and second side edges, the first side edge is connected with an inner wall surface of the feeding hopper and is perpendicular to a central axis of the feeding hopper, in a vertical direction, the first side edge is located above the second side edge, in a horizontal direction, the second side edge is located between the first side edge and the central axis, a gap is formed between a back surface of the collision-proof plate and the inner wall surface of the feeding hopper, the cutter and the driving mechanism are located in the gap, the cutter is connected with the driving mechanism, and the driving mechanism is configured to drive the cutter to reciprocate between a first position and a second position, when the cutter moves to the first position, the cutter is located in the gap, and when the cutter moves to the second position, the cutter protrudes from the collision-proof plate. The present disclosure can cut a ton bag falling into the feeding hopper multiple times, ensure that the ton bag is cut, and improve the feeding efficiency of the fracturing sand.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of shale gas exploitation, and particularly relates to a shale gas fracturing sand feeding device and a sand conveying system. BACKGROUND

[0002] Shale gas is usually developed by hydraulic fracturing, and a large amount of proppant mixed with fracturing sand needs to be injected into the formation fracture to support the fracture during hydraulic fracturing. Therefore, a large amount of fracturing sand needs to be used during fracturing of the formation, and a sand conveying system is usually used to continuously supply sand to meet the sand adding requirement.

[0003] In the related art, the sand conveying system includes a feeding hopper, a sand conveying mechanism and a storage bin, wherein the inlet of the sand conveying mechanism is connected with the feeding hopper, the outlet of the sand conveying mechanism is connected with the storage bin, and the sand conveying mechanism is used to convey the fracturing sand added in the feeding hopper into the storage bin. During conveying of the fracturing sand, a ton bag filled with the fracturing sand is usually hoisted by a crane from the ground to the top of the feeding hopper, so that the ton bag falls into the feeding hopper, and a drawknife in the feeding hopper cuts the ton bag to make the fracturing sand leak out and then enter the sand conveying mechanism along the feeding hopper.

[0004] However, in this sand adding mode of dropping the ton bag from the top of the feeding hopper, if the ton bag is not cut after contacting the drawknife after falling into the feeding hopper, the ton bag is prone to block the feeding hopper. In addition, the ton bag is also prone to damage the drawknife after falling into the feeding hopper, so that the ton bag subsequently dropped cannot be cut, and thus the feeding cannot be continuously performed. Therefore, the fracturing sand feeding efficiency in the related art is low. SUMMARY

[0005] The present disclosure provides a shale gas fracturing sand feeding device and a sand conveying system, which can cut a ton bag falling into a feeding hopper multiple times to ensure that the ton bag is cut and improve the fracturing sand feeding efficiency. The technical solution is as follows.

[0006] The present disclosure provides a shale gas fracturing sand feeding device, which includes a feeding hopper and a feeding assembly. The feeding assembly includes a collision prevention plate, a drawknife and a driving mechanism. The collision prevention plate has opposite first and second side edges. The first side edge is connected with the inner wall surface of the feeding hopper and is perpendicular to the central axis of the feeding hopper. In the vertical direction, the first side edge is located above the second side edge. In the horizontal direction, the second side edge is located between the first side edge and the central axis. There is a gap between the back surface of the collision prevention plate and the inner wall surface of the feeding hopper. The drawknife and the driving mechanism are located in the gap. The drawknife is connected with the driving mechanism. The driving mechanism is configured to drive the drawknife to reciprocate between a first position and a second position. When the drawknife moves to the first position, the drawknife is located in the gap. When the drawknife moves to the second position, the drawknife protrudes from the collision prevention plate.

[0007] In an implementation form of the embodiment of the present disclosure, the driving mechanism comprises a transmission mechanism and a motor, the transmission mechanism comprises an input part and an output part, an output shaft of the motor is in transmission connection with the input part, the blade is connected with the output part, and the transmission mechanism is configured to drive the output part to reciprocate the blade between the first position and the second position when the input part performs a circular motion.

[0008] In another implementation form of the embodiment of the present disclosure, the transmission mechanism comprises a crank, a connecting rod and a rocker, a first end of the crank is connected with the output shaft of the motor, a second end of the crank is hinged with a first end of the connecting rod, a second end of the connecting rod is connected with a first end of the rocker, a second end of the rocker is hinged with an inner wall surface of the upper hopper, and the blade is connected with the second end of the connecting rod, wherein the length of the crank is less than the length of the rocker.

[0009] In another implementation form of the embodiment of the present disclosure, the transmission mechanism comprises a gear, a rack and a guide frame, the gear is in meshing with the rack, the rack is slidingly installed on the guide frame, the guide frame is located on the inner wall surface of the upper hopper, the gear is in transmission connection with the output shaft of the motor, and the rack is connected with the blade.

[0010] In another implementation form of the embodiment of the present disclosure, the upper feeding assembly further comprises a material shaking member, the material shaking member is located in the gap, and the material shaking member is used to drive the anti-collision plate to vibrate.

[0011] In another implementation form of the embodiment of the present disclosure, the material shaking member is a cam, the cam is in transmission connection with the output shaft of the motor, and the distance between the anti-collision plate and the rotating central axis of the cam is less than the maximum distance between a point on the outer wall of the cam and the rotating central axis of the cam.

[0012] In another implementation form of the embodiment of the present disclosure, the blade is in the shape of a pyramid, and a blade is arranged on the side wall of the blade.

[0013] In another implementation form of the embodiment of the present disclosure, the upper feeding device further comprises a conical blocking ring, a smaller-diameter end of the conical blocking ring is connected with the upper end of the upper hopper, and a buffer pad is arranged on the inner wall surface of the conical blocking ring.

[0014] In another implementation form of the embodiment of the present disclosure, the upper feeding device further comprises a dustproof net, and the dustproof net is circumferentially arranged around the upper end of the upper hopper.

[0015] The embodiment of the present disclosure provides a sand conveying system for shale gas fracturing sand, and the sand conveying system comprises the shale gas fracturing sand upper feeding device described above.

[0016] The technical scheme provided by the embodiments of the present disclosure has at least the following beneficial effects:

[0017] The shale gas fracturing sand feeding device provided by the embodiments of the present disclosure comprises a feeding hopper and a feeding assembly, wherein a first side edge of a bumper plate of the feeding assembly is connected to an inner wall surface of the feeding hopper, and a second side edge of the bumper plate is below the first side edge, so that a gap exists between the plate surface of the bumper plate and the inner wall surface of the feeding hopper, and the gap is used to arrange a scraper and a driving mechanism. When a ton bag falls into the feeding hopper, the ton bag can be prevented from falling and damaging the scraper and the driving mechanism by the shielding of the bumper plate. Meanwhile, the driving mechanism can drive the scraper to reciprocate between a first position and a second position, and when the scraper moves to the first position, the scraper is in the gap, that is, the ton bag falling on the bumper plate cannot contact the scraper and cannot damage the scraper; and when the scraper moves to the second position, the scraper extends out of the gap, so that the scraper can protrude from the bumper plate and cut the ton bag. Since the driving mechanism can drive the scraper to reciprocate between the two positions, the scraper can repeatedly cut the ton bag to ensure that the ton bag can be cut and the problem of ton bag blockage can be avoided, and the feeding efficiency of the fracturing sand is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative effort.

[0019] Figure 1 is a structural schematic view of a shale gas fracturing sand conveying device provided by the related art;

[0020] Figure 2 is a structural schematic view of a shale gas fracturing sand feeding device provided by the embodiments of the present disclosure;

[0021] Figure 3 is Figure 2 is a local enlarged view of A provided by the present disclosure;

[0022] Figure 4 is a structural schematic view of a driving mechanism provided by the embodiments of the present disclosure.

[0023] The various marks in the drawings are explained as follows:

[0024] 1-feeding hopper, 11-gap, 12-mounting seat;

[0025] 2 - feeding assembly, 21 - anti-collision plate, 211 - first side edge, 212 - second side edge, 22 - cutter, 221 - blade, 23 - driving mechanism, 231 - motor, 232 - crank, 233 - connecting rod, 234 - rocker, 235 - gear, 236 - rack, 237 - guide frame, 238 - guide groove, 24 - material shaking member;

[0026] 3 - conical blocking ring, 31 - buffer pad;

[0027] 4 - dustproof screen;

[0028] 51 - sand conveying mechanism, 52 - storage bin. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the following will further describe the embodiments of the present disclosure in combination with the drawings.

[0030] Unless otherwise defined, the technical terms or scientific terms used herein should be understood as the common meanings thereof by those skilled in the art to which the present disclosure belongs. The terms "first", "second", "third" and the like used in the present patent application specification and claims do not represent any order, number or importance, but are only used to distinguish different components. Similarly, "one" or "a" and the like do not represent a quantity limitation, but represent the existence of at least one. "Include" or "contain" and the like mean that the elements or objects appearing before "include" or "contain" cover the elements or objects listed after "include" or "contain" and their equivalents, and do not exclude other elements or objects. "Connected" or "connected" and the like are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right", "top", "bottom" and the like are only used to represent relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships may also change accordingly.

[0031] Figure 1 is a structural schematic diagram of a sand conveying device for shale gas fracturing sand provided by the related art. As shown in Figure 1 , the sand conveying device includes a feeding hopper 1, a sand conveying mechanism 51 and a storage bin 52.

[0032] As shown in Figure 1 , the sand conveying mechanism 51 can be a screw conveying mechanism, which has an input pipe and three output pipes. The lower end of the feeding hopper 1 is in communication with the input pipe, and the three storage bins 52 are respectively in communication with the three output pipes. The inner wall surface of the feeding hopper 1 is provided with a cutter 22 for cutting a ton bag falling into the feeding hopper 1.

[0033] When conveying the fracturing sand, the crane hoists the ton bag above the upper hopper 1, and the cutter 22 on the inner wall surface of the upper hopper 1 directly contacts the ton bag to cut the ton bag after the ton bag falls into the upper hopper 1, so that the fracturing sand leaks out and is then conveyed to different output pipes by the screw conveying mechanism to be stored in different storage bins 52.

[0034] However, when the ton bag is lowered, the falling ton bag is easy to damage the cutter 22, and the ton bag is also easy to fail to cut the cutter 22 after contacting the cutter 22, thereby causing the ton bag to block the upper hopper, and thus the feeding efficiency of the fracturing sand is low.

[0035] Therefore, the embodiment of the present disclosure provides a shale gas fracturing sand feeding device. Figure 2 It is a structural schematic diagram of a shale gas fracturing sand feeding device provided by the embodiment of the present disclosure. As shown in Figure 2 The feeding device comprises an upper hopper 1 and an upper feeding assembly 2.

[0036] As shown in Figure 1 The upper feeding assembly 2 comprises a bumper plate 21, a cutter 22 and a driving mechanism 23. The bumper plate 21 has opposite first and second side edges 211 and 212. The first side edge 211 is connected with the inner wall surface of the upper hopper 1 and is perpendicular to the central axis of the upper hopper 1. In the vertical direction, the first side edge 211 is located above the second side edge 212. In the horizontal direction, the second side edge 212 is located between the first side edge 211 and the central axis. There is a gap 11 between the back surface of the bumper plate 21 and the inner wall surface of the upper hopper 1. The cutter 22 and the driving mechanism 23 are located in the gap 11. The cutter 22 is connected with the driving mechanism 23. The driving mechanism 23 is configured to drive the cutter 22 to reciprocate between a first position and a second position.

[0037] The back surface of the bumper plate 21 refers to the plate surface of the bumper plate 21 facing the inner wall surface of the upper hopper 1, or the plate surface of the bumper plate 21 facing away from the upper end opening of the upper hopper 1.

[0038] When the cutter 22 moves to the first position, the cutter 22 is located in the gap 11. When the cutter 22 moves to the second position, the cutter 22 protrudes from the bumper plate 21.

[0039] The shale gas fracturing sand feeding device provided by the embodiments of the present disclosure comprises a feeding hopper 1 and a feeding assembly 2, wherein the first side edge 211 of the anti-collision plate 21 of the feeding assembly 2 is connected to the inner wall surface of the feeding hopper 1, and the second side edge 212 of the anti-collision plate 21 is below the first side edge 211, so that a gap 11 exists between the plate surface of the anti-collision plate 21 and the inner wall surface of the feeding hopper 1, and the gap 11 is used to arrange a scraper 22 and a driving mechanism 23. When the ton bag falls into the feeding hopper 1, the ton bag can be prevented from falling and damaging the scraper 22 and the driving mechanism 23 by the shielding of the anti-collision plate 21. Meanwhile, the driving mechanism 23 can drive the scraper 22 to reciprocate between a first position and a second position, and when the scraper 22 moves to the first position, the scraper is in the gap 11, that is, the ton bag falling on the anti-collision plate 21 cannot contact the scraper 22 and cannot damage the scraper 22; and when the scraper 22 moves to the second position, the scraper 22 extends out of the gap 11, so that the scraper 22 can protrude from the anti-collision plate 21, thereby allowing the scraper 22 to cut the ton bag. Since the driving mechanism 23 can drive the scraper 22 to reciprocate between the two positions, the scraper 22 can repeatedly cut the ton bag to ensure that the ton bag can be cut and the problem of ton bag blockage can be avoided, thereby improving the feeding efficiency of the fracturing sand.

[0040] In the embodiments of the present disclosure, the feeding hopper 1 is funnel-shaped, that is, the feeding hopper 1 is a hollow shell structure, both ends of the feeding hopper 1 are open, and the opening size of one end of the feeding hopper 1 is larger than that of the other end of the feeding hopper 1.

[0041] As shown in the drawings, Figure 2 The feeding hopper 1 is vertically placed, and the opening size of the upper end of the feeding hopper 1 is larger than that of the lower end of the feeding hopper 1. In this way, when the ton bag falls into the feeding hopper 1, the fracturing sand leaked from the ton bag will gather at the lower end of the feeding hopper 1, and finally enter the spiral conveying mechanism through the input pipeline.

[0042] Optionally, at least part of the area of the feeding hopper 1 is transparent. In this way, the technician can observe the cutting of the ton bag and the leakage of the ton bag in the feeding hopper 1 through the transparent area of the feeding hopper 1. In order to cut the ton bag when the ton bag is not cut, the driving mechanism 23 is controlled to repeatedly cut the ton bag with the scraper 22. After the fracturing sand in the ton bag is leaked, the ton bag is added to the feeding hopper 1, so that the feeding device can work continuously and uninterruptedly.

[0043] Exemplarily, an observation window can be arranged on the feeding hopper 1, and the observation window is located opposite to the scraper 22 mechanism. In this way, the working state of the scraper 22 mechanism and the cutting of the ton bag can be observed conveniently.

[0044] Exemplarily, the upper hopper 1 can also be a fully transparent structure made of transparent material. For example, the upper hopper 1 can be made of polycarbonate, which has the characteristics of high transparency, light weight and impact resistance. Therefore, in addition to being transparent to meet the observation requirements of the technicians, the upper hopper 1 made of polycarbonate also has good strength, which can avoid the problem of being damaged by the falling ton bag, and improve the reliability.

[0045] Optionally, the anti-collision plate 21 can be a metal plate. The metal plate has high strength and can resist impact to avoid the ton bag falling easily damaging the anti-collision plate 21.

[0046] As shown in Figure 2 , one side of the anti-collision plate 21 can be welded to the inner wall of the upper hopper 1. The anti-collision plate 21 can be a rectangular flat plate structure to provide sufficient area to shield the driving mechanism 23 and the cutter 22.

[0047] Figure 3 As shown in Figure 2 , the cutter 22 can be a pyramid, that is, one end of the cutter 22 is a sharp end, and the other end of the cutter 22 is connected with the driving mechanism 23. In this way, when the driving mechanism 23 controls the cutter 22 to protrude from the anti-collision plate 21, the ton bag can be cut by the sharp end of the cutter 22, so that the cutter 22 is more easily cut the ton bag. Figure 3 As shown in

[0048] , a blade 221 can be arranged on the side wall of the cutter 22. The blade 221 can be triangular, and the sharp end of the blade 221 extends away from the sharp end of the cutter 22. That is, a barb structure is formed on the side wall of the cutter 22. In this way, even if the sharp end of the cutter 22 does not cut the ton bag after being inserted into the ton bag, the blade 221 on the cutter 22 can cut the ton bag again when the cutter 22 is retracted, so as to make the puncture on the ton bag larger, and facilitate the rapid leakage of the fractured sand in the ton bag. Figure 3 Optionally, as shown in

[0049] , the driving mechanism 23 includes a transmission mechanism and a motor 231. The transmission mechanism includes an input portion and an output portion. The output shaft of the motor 231 is in transmission connection with the input portion, and the cutter 22 is connected with the output portion. Figure 3 The transmission mechanism is configured to drive the output portion to reciprocate the cutter 22 between the first position and the second position when the input portion makes a circular motion.

[0050]

[0051] ​In the above implementation, the output shaft of the motor 231 is in transmission connection with the input portion, so that the motor 231 can drive the input portion to rotate, and when the input portion performs the circular motion, the transmission mechanism can drive the output shaft to reciprocate between the two positions. That is, the cutter 22 can reciprocate with the output portion between the two positions, so that the cutter 22 can repeatedly cut the ton bag to ensure that the ton bag is cut, avoid the problem of ton bag blockage, and improve the feeding efficiency of the fracturing sand.

[0052] In the embodiments of the present disclosure, in order to stably install the motor 231 in the feeding hopper 1, a mounting seat 12 can be arranged in the feeding hopper 1 to support the motor 231.

[0053] For example, as shown in Figure 3 The mounting seat 12 includes two connecting plates, the two connecting plates are in angular connection, and the two connecting plates are connected to the inner wall surface of the feeding hopper 1, so that the two connecting plates and the feeding hopper 1 form a stable triangular structure, thereby reliably supporting the motor 231.

[0054] In some implementations, as shown in Figure 3 The transmission mechanism includes a crank 232, a connecting rod 233, and a rocker 234, the first end of the crank 232 is connected to the output shaft of the motor 231, the second end of the crank 232 is hinged to the first end of the connecting rod 233, the second end of the connecting rod 233 is connected to the first end of the rocker 234, the second end of the rocker 234 is hinged to the inner wall surface of the feeding hopper 1, and the cutter 22 is connected to the second end of the connecting rod 233.

[0055] The crank 232, the connecting rod 233, and the rocker 234 together constitute a crank 232 connecting rod 233 mechanism. The length of the crank 232 is less than the length of the rocker 234, so that when the crank 232 connecting rod 233 mechanism operates, the crank 232 can perform the circular motion to enable the rocker 234 to reciprocate along the circular arc trajectory.

[0056] In operation, the motor 231 operates to drive the crank 232 to rotate, under the driving of the crank 232, the connecting rod 233 also operates with the crank 232, and the rocker 234 moves with the connecting rod 233, and the rocker 234 reciprocates within a certain angle, that is, the rocker 234 reciprocates along the circular arc trajectory. Therefore, the cutter 22 installed at the second end of the connecting rod 233 and located at the first end of the rocker 234 also reciprocates with the rocker 234. In the process of reciprocation, the tip of the cutter 22 moves back and forth on both sides of the anti-collision plate 21, that is, the cutter 22 reciprocates between the first position and the second position.

[0057] When the drawbar 234 is pulled, the drawbar 234 swings to one end of the circular arc track, and the drawbar 22 is below the baffle plate 21 and is protected by the baffle plate 21; when the drawbar 234 is pulled to the second position, the drawbar 234 swings to the other end of the circular arc track, and the drawbar 22 extends out of the protection range of the baffle plate 21, and the extended drawbar 22 cuts the ton bag in the feeding hopper 1. Since the crank 232 connecting rod 233 mechanism is always in action, after the drawbar 22 cuts the ton bag, the drawbar 22 is also retracted from the ton bag and retracted to the first position. Under the continuous driving of the motor 231, the drawbar 22 moves to the second position again and continues to cut the ton bag. In this way, under the driving of the motor 231, the drawbar 22 can repeatedly cut the ton bag to ensure that the ton bag is cut and the problem of ton bag blockage is avoided, and the feeding efficiency of the fracturing sand is improved.

[0058] In the embodiment of the present disclosure, the feeding assembly 2 can be multiple, and the multiple feeding assemblies 2 are distributed circumferentially on the inner wall surface of the feeding hopper 1. In order to ensure that the ton bag can be contacted with the feeding assembly 2 after falling into the feeding hopper 1 from different positions, the ton bag is smoothly cut, and the feeding of the fracturing sand is completed.

[0059] Exemplarily, as shown in Figure 2 , the feeding assembly 2 has two, and the two feeding assemblies 2 are symmetrically distributed about the central axis of the feeding hopper 1.

[0060] In other implementations, Figure 4 is a structural schematic diagram of a driving mechanism provided by the embodiment of the present disclosure. As shown in Figure 4 , the transmission mechanism includes a gear 235, a rack 236, and a guide frame 237. The gear 235 is engaged with the rack 236, the rack 236 is slidingly installed on the guide frame 237, the guide frame 237 is located on the inner wall surface of the feeding hopper 1, the gear 235 is in transmission connection with the output shaft of the motor 231, and the rack 236 is connected with the drawbar 22.

[0061] Among them, the gear 235 is coaxially connected with the output shaft of the motor 231, so that the gear 235 can rotate under the driving of the motor 231, and the gear 235 is engaged with the rack 236, so that the gear 235 can drive the rack 236 to do straight line motion. In this way, when the motor 231 rotates forward, the rack 236 can be driven to move linearly in one direction; when the motor 231 reverses, the rack 236 can be driven to move linearly in the opposite direction. That is, by controlling the gear 235 to rotate forward or reverse through the motor 231, the rack 236 can move back and forth along the linear track.

[0062] In operation, the motor 231 is actuated to drive the gear 235 to rotate, and the rack 236 is driven to move linearly by the gear 235. If the rotation direction of the motor 231 is changed, the rack 236 can move in the opposite direction. That is, the rack 236 can move back and forth along a linear track. Thus, the cutter 22 mounted on the rack 236 can move with the rack 236. During the movement of the cutter 22, the tip of the cutter 22 moves back and forth on both sides of the bumper plate 21, that is, the cutter 22 moves back and forth between the first position and the second position.

[0063] Under the traction of the rack 236, when the cutter 22 moves to the first position, the cutter 22 is below the bumper plate 21 and is protected by the bumper plate 21. If it is desired to control the cutter 22 to extend, the rotation direction of the motor 231 can be changed so that the cutter 22 moves to the second position. At this time, the cutter 22 extends out of the protection range of the bumper plate 21, and the extended cutter 22 cuts the ton bag in the hopper 1.

[0064] Thus, during operation, the rotation direction of the motor 231 is changed every set time, and the cutter 22 can move back and forth to ensure that the ton bag is cut repeatedly to avoid the problem of ton bag blockage and improve the efficiency of loading the fractured sand.

[0065] The set time can be determined according to the size of the gear 235 and the length of the rack 236. As long as the rack 236 does not separate from the gear 235 after the motor 231 rotates for the set time, the motor 231 can still drive the rack 236 to continue to extend after the rotation direction is changed.

[0066] Exemplarily, as shown in Figure 4 The guide frame 237 can be a guide plate, the guide plate is provided with a guide groove 238 on the plate surface, the rack 236 is slidingly installed in the guide groove 238, and one side of the guide plate is connected with the inner wall surface of the hopper 1. Thus, when the motor 231 drives the gear 235 to move, the rack 236 can move linearly along the guide groove 238. The guide plate can support the rack 236 and guide the movement direction of the rack 236.

[0067] In some other implementations of the present disclosure, the driving mechanism 23 can include a telescopic rod, one end of the telescopic rod is fixed on the inner wall surface of the upper hopper 1, and the other end of the telescopic rod is connected with the cutter 22. In operation, the telescopic rod is controlled to extend and retract, so that the cutter 22 can also move in extension and retraction. When the cutter 22 is retracted below the anti-collision plate 21, the cutter 22 is moved to the first position; when the cutter 22 is retracted above the anti-collision plate 21, the cutter 22 is moved to the second position. In this way, under the driving of the telescopic rod, the cutter 22 can repeatedly cut the ton bag, so as to ensure that the ton bag can be cut, avoid the problem of ton bag blockage, and improve the feeding efficiency of the fracturing sand.

[0068] Optionally, the feeding assembly 2 further includes a material shaking member 24, the material shaking member 24 is located in the gap 11, and the material shaking member 24 is used to drive the anti-collision plate 21 to vibrate.

[0069] In this way, the anti-collision plate 21 can be caused to vibrate by the material shaking member 24, the vibrating anti-collision plate 21 can shake off the fracturing sand adhered to the anti-collision plate 21, and prevent the fracturing sand from accumulating. Meanwhile, the vibrating anti-collision plate 21 can also make the fracturing sand in the ton bag on the anti-collision plate 21 leak out quickly.

[0070] For example, as shown in Figure 3 the material shaking member 24 is a cam, the cam is in transmission connection with the output shaft of the motor 231, and the distance between the anti-collision plate 21 and the rotating central axis of the cam is less than the maximum distance between the outer peripheral wall of the cam and the rotating central axis of the cam.

[0071] Since the distance between the anti-collision plate 21 and the rotating central axis of the cam is less than the maximum distance between the outer peripheral wall of the cam and the rotating central axis of the cam, the cam will intermittently impact the anti-collision plate 21 in the process of rotation, so that the anti-collision plate 21 vibrates.

[0072] In this way, when the motor 231 drives the cam to rotate, the rotating cam will intermittently contact and impact the anti-collision plate 21. Meanwhile, the cam will extrude the anti-collision plate 21 when contacting the anti-collision plate 21, so that the anti-collision plate 21 is warped, so that the cam can continue to rotate. When the cam is not in contact with the anti-collision plate 21, the anti-collision plate 21 returns to the original position, so that the anti-collision plate 21 starts to vibrate. The vibrating anti-collision plate 21 can shake off the fracturing sand adhered to the anti-collision plate 21, and prevent the fracturing sand from accumulating. Meanwhile, the vibrating anti-collision plate 21 can also make the fracturing sand in the ton bag on the anti-collision plate 21 leak out quickly.

[0073] The cam can be made of rubber, so that the cam will not scratch the anti-collision plate 21 when the cam contacts the anti-collision plate 21.

[0074] For example, as shown in Figure 2As shown, the feeding device further comprises a conical blocking ring 3, the smaller-diameter end of the conical blocking ring 3 is connected with the upper end of the feeding hopper 1, and the inner wall surface of the conical blocking ring 3 is provided with a buffer pad 31.

[0075] The conical blocking ring 3 has a gradually decreasing inner diameter from top to bottom, so that when the ton bag is hoisted above the feeding hopper 1 and then falls along the conical blocking ring, the ton bag will slide along the conical blocking ring to the lower side of the conical blocking ring to enter the feeding hopper 1.

[0076] In addition, the inner diameter of the smaller-diameter end of the conical blocking ring 3 is the same as the inner diameter of the upper end of the feeding hopper 1, that is, after the conical blocking ring 3 is arranged above the feeding hopper 1, the opening of the feeding hopper 1 is expanded, so that after the ton bag is hoisted, the ton bag does not need to be accurately judged to fall to the drop point, and the feeding is convenient and fast.

[0077] Exemplarily, the buffer pad 31 arranged on the inner wall surface of the conical blocking ring 3 can be a sponge pad, which is bonded to the inner wall surface of the conical blocking ring 3. When the ton bag falls onto the conical blocking ring 3, the sponge pad has a certain buffering effect on the impact force of the ton bag, so as to prevent the conical blocking ring 3 from being damaged.

[0078] As shown, Figure 3 The feeding device further comprises a dust screen 4, which is circumferentially arranged around the upper end of the feeding hopper 1. By arranging the dust screen 4, the diffusion range of the dust generated after the ton bag is pierced can be reduced, so that most of the dust is limited within the range of the dust screen 4, thereby avoiding air pollution.

[0079] With Figure 2 For example, the shale gas fracturing sand feeding device provided herein is taken as an example to briefly describe the working process of the feeding device. First, the ton bag is hoisted above the feeding hopper 1 and then falls into the feeding hopper 1. Then, the motor 231 is started, the motor 231 drives the crank 232 to rotate, the crank 232 drives the rocker 234 to swing within a certain angle, and then the cutter 22 swings together, so that the cutter 22 can repeatedly cut the ton bag in the swinging process, and finally the ton bag is cut to make the fracturing sand in the ton bag leak out. At the same time, the motor 231 drives the cam to move, the rotating cam intermittently touches the bumper plate 21, so that the bumper plate 21 vibrates to accelerate the leakage speed of the fracturing sand in the ton bag. Then, the technician observes the specific situation of the cutter 22 cutting the ton bag and the leakage condition of the ton bag after being cut in the feeding hopper 1, so as to determine whether the fracturing sand in the ton bag is leaked out, and to facilitate the quick completion of the second round of sand conveying, thereby improving the efficiency of sand conveying.

[0080] The shale gas fracturing sand conveying system provided by the embodiments of the present disclosure comprises the shale gas fracturing sand feeding device as described above.

[0081] Referring to Figure 1The sand conveying system can further comprise a sand conveying mechanism 51 having an input pipe and an output pipe, and a storage bin 52. The lower end of the upper hopper 1 is communicated with the input pipe, and the storage bin 52 is communicated with the output pipe. In this way, the fracturing sand falling from the upper feeding device can be conveyed to the storage bin by the sand conveying mechanism.

[0082] By arranging the upper feeding device in the sand conveying system, after the ton bag falls into the upper feeding device, the ton bag can be repeatedly cut by the drawknife, so as to ensure that the ton bag is cut to allow the fracturing sand to be smoothly conveyed to the storage bin, and the feeding efficiency of the fracturing sand is improved.

[0083] The above is not intended to limit the disclosure in any form, although the disclosure has been disclosed as above through the embodiments, however, it is not intended to limit the disclosure, any person skilled in the art can make some changes or modifications to the equivalent embodiments by utilizing the disclosed technical content without departing from the technical solution range of the disclosure, as long as the changes or modifications do not depart from the technical solution of the disclosure, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the disclosure still belong to the range of the technical solution of the disclosure.

Claims

1. A feeding device for shale gas fracturing sand, characterized in that, The feeding device includes: Feeding hopper (1); The feeding assembly (2) includes a crash plate (21), a slicing blade (22), and a drive mechanism (23). The crash plate (21) has opposite first side (211) and second side (212). The first side (211) is connected to the inner wall of the feeding hopper (1) and is perpendicular to the central axis of the feeding hopper (1). In the vertical direction, the first side (211) is located above the second side (212). In the horizontal direction, the second side (212) is located between the first side (211) and the central axis. There is a gap (11) between the back of the crash plate (21) and the inner wall of the feeding hopper (1). The slicing blade (22) and the drive mechanism (23) are located in the gap (11). The slicing blade (22) and the drive mechanism (23) are connected to each other. The drive mechanism (23) is configured to drive the slicing blade (22) to reciprocate between a first position and a second position. When the slicing blade (22) moves to the first position, the slicing blade (22) is located within the gap (11). When the slicing blade (22) moves to the second position, the slicing blade (22) protrudes from the anti-collision plate (21). The drive mechanism (23) includes a transmission mechanism and a motor (231). The transmission mechanism includes an input part and an output part. The output shaft of the motor (231) is connected to the input part. The slicing blade (22) is connected to the output part. The transmission mechanism is configured to drive the slicing blade (22) to reciprocate between the first position and the second position when the input part makes a circular motion. The transmission mechanism includes a crank (232), a connecting rod (233), and a rocker arm (234). The first end of the crank (232) is connected to the output shaft of the motor (231). The second end of the crank (232) is hinged to the first end of the connecting rod (233). The second end of the connecting rod (233) is connected to the first end of the rocker arm (234). The second end of the rocker arm (234) is hinged to the inner wall of the hopper (1). The slicing blade (22) is connected to the second end of the connecting rod (233). The length of the crank (232) is less than the length of the rocker arm (234). The slicing blade (22) swings back and forth along an arc trajectory. The side wall of the slicing blade (22) is provided with a blade (221). One end of the blade (221) is a tip, and the tip of the blade (221) extends in a direction away from the tip of the slicing blade (22). The cam is located in the gap (11), and the cam is connected to the output shaft of the motor (231). The distance between the anti-collision plate (21) and the rotation axis of the cam is less than the maximum distance between the point on the outer peripheral wall of the cam and the rotation axis of the cam. The cam is made of rubber, and the anti-collision plate (21) is made of metal. During the rotation process, the cam intermittently impacts the anti-collision plate (21), causing the anti-collision plate (21) to vibrate. A conical retaining ring (3) is provided with a buffer pad (31) on the inner wall of the conical retaining ring (3), the buffer pad (31) being a sponge pad, and the side wall inclination angle of the conical retaining ring (3) being smaller than that of the side wall inclination angle of the feeding hopper (1). Dustproof net (4) is circumferentially surrounding the upper end of the feeding hopper (1).

2. The feeding device according to claim 1, characterized in that, The slicing blade (22) is pyramidal in shape.

3. A sand conveying system for shale gas fracturing sand, characterized in that, The sand conveying system includes a shale gas fracturing sand feeding device as described in claim 1 or 2.

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