A sand adding device for a shale oil and gas fracturing system

Abstract

The present invention discloses a sand adding device for a shale oil and gas fracturing system, belonging to the technical field of shale oil and gas exploitation. The sand adding device includes a controller, a bag-breaking feeding mechanism, and a mixing and stirring mechanism. The bag-breaking feeding mechanism includes a feeding chain conveyor and a feeding hopper. A plurality of bag-fixing units are arranged on the feeding chain conveyor. The bag-fixing unit includes two mirror-image bag-fixing components. The bag-fixing component includes a mounting plate installed on the feeding chain conveyor. A telescopic bag-fixing member is rotatably connected to the mounting plate. A tool rest is arranged on the feeding hopper, and a bag-breaking knife for splitting the sand bag into two halves is arranged in the middle of the tool rest. The mixing and stirring mechanism includes a stirring tank connected to the feeding hopper. A multi-dimensional stirring mechanism is arranged on the stirring tank, and a slurry supply pump is arranged at the bottom of the stirring tank. By adopting the above sand adding device, stirring in the rotating, vertical, and horizontal dimensions is achieved, the stirring efficiency is improved, the equipment cost is low, the bag-breaking efficiency is high, and the operation is simple.

Description

Technical Field

[0001] The present invention relates to the technical field of shale oil and gas exploitation, and particularly to a sand adding device for a shale oil and gas fracturing system. Background Art

[0002] Fracturing construction refers to a technical means in oil and gas well exploitation, which uses high-pressure liquid to controllably fracture the downhole rock to improve production capacity and recovery rate. In order to increase the production of oil and gas wells, sand is added to enhance the permeability of the pore reservoirs in the formation, and mortar is injected into the drilling wellbore to form fractures or expand existing fractures, thereby improving the collection efficiency of natural gas or oil.

[0003] In order to ensure a stable flow channel for oil and gas, a proppant (such as quartz sand, resin, etc.) is generally provided in the fracturing fluid. During the fracturing construction process, the high-pressure fracturing fluid forms fractures in the shale layer. When the pressure of the fracturing fluid is released, the proppant can keep the fractures in an open state and prevent the fractures from closing. The proppant accumulates in the fractures to form a propped layer with a certain permeability, and oil and gas can flow through the pores and channels between these proppants to the wellbore, enabling the oil and gas to flow more smoothly from the formation to the wellhead, thereby increasing the oil and gas production. Existing sand adding devices improve the uniformity of mixing by setting a variety of stirring blades. For example, a sand adding device for a shale oil and gas fracturing system disclosed in the publication number CN217725263U stirs and lifts the sand material at the bottom through the setting of a second stirring blade, and cooperates with the material lifting of the flat plate and the stirring of the spiral stirring blade to efficiently achieve uniform mixing of the sand material and the mixed liquid. However, the following problems still exist in the prior art:

[0004] (1) Stirring in two directions is achieved, but the driving components are increased, raising the equipment cost. At the same time, in order to prevent interference between the stirring blades and the telescopic cylinder, the stirring blades are made smaller, reducing the stirring efficiency.

[0005] (2) There is no feeding device, and manual bag breaking and sand adding are adopted, resulting in a large labor intensity. When using a robotic arm to grab and break the bag, in order to ensure that all the materials in the bag completely fall into the hopper, the bag body needs to be shaken at multiple angles, with low efficiency. Summary of the Invention

[0006] The purpose of the present invention is to provide a sand adding device for a shale oil and gas fracturing system to solve the above technical problems.

[0007] To achieve the above purpose, the present invention provides a sand adding device for a shale oil and gas fracturing system, including a controller, a bag breaking and feeding mechanism, and a mixing and stirring mechanism. The bag breaking and feeding mechanism and the mixing and stirring mechanism are both electrically connected to the controller;

[0008] The bag-breaking feeding mechanism includes a feeding chain conveyor and a feeding hopper. A number of bag-fixing units are arranged on the feeding chain conveyor. The bag-fixing unit includes two mirror-image bag-fixing components. The bag-fixing component includes a mounting plate installed on the feeding chain conveyor. A telescopic bag-fixing member is rotatably connected to the mounting plate. A tool rest is arranged on the feeding hopper, and a bag-breaking knife for splitting the sand bag into two halves is arranged in the middle of the tool rest.

[0009] The mixing and stirring mechanism includes a stirring tank connected to the feeding hopper. A multi-dimensional stirring mechanism is arranged on the stirring tank, and a slurry pump is arranged at the bottom of the stirring tank.

[0010] Preferably, the telescopic bag-fixing member includes an adjusting telescopic rod and a suction cup or a thumb cylinder arranged at the telescopic end of the adjusting telescopic rod. The suction cup or the thumb cylinder is connected to an air pump. A distance sensor is arranged on the cylinder body of the adjusting telescopic rod. A triggering protrusion is arranged on the cylinder body of the adjusting telescopic rod, and the triggering protrusion is arranged opposite to the trigger switch on the mounting plate.

[0011] The adjusting telescopic rod, the air pump, the distance sensor, and the trigger switch are all electrically connected to the controller. When the adjusting telescopic rod is in a horizontal state, the triggering protrusion presses against the trigger switch. After the controller receives the trigger signal, it collects the distances between both sides of the sand bag and the distance sensor through the distance sensor. The controller controls the telescopic amount of the adjusting telescopic rod according to the collected distance data, so that the suction cup or the thumb cylinder fits the sand bag, and then starts the air pump to make the suction cup adsorb the sand bag or the thumb cylinder clamp the sand bag.

[0012] Preferably, a vibration spring is arranged on the mounting plate, and the vibration spring is arranged opposite to the cylinder body when the telescopic end of the adjusting telescopic rod faces downwards. After the sand bag is cut into two halves, the adjusting telescopic rod changes from a horizontal state to a vertical state and collides with the vibration spring, causing the adjusting telescopic rod to vibrate and shake the remaining sand material into the feeding hopper.

[0013] Two return frames are symmetrically arranged at the feeding end of the feeding chain conveyor. A baffle is arranged on the return frame. One end of the baffle is fixed on the return frame, and a blind hole is arranged at the other end of the baffle. A return rod is connected in the blind hole through a return spring. A return wedge block is arranged at the top of the return rod, and the return wedge block is arranged opposite to the cylinder body when the telescopic end of the adjusting telescopic rod faces downwards. The bag-fixing unit returns to the feeding position under the conveyance of the feeding chain conveyor. A bag-supporting plate is arranged at the feeding end of the feeding chain conveyor. The feeding end of the bag-supporting plate is semi-circular, and the discharging end of the bag-supporting plate is arranged opposite to the upper end of the feeding hopper. When the adjusting telescopic rod moves to the position of the baffle, the baffle pushes down the adjusting telescopic rod passing through the return wedge block, so that the two symmetrically arranged adjusting telescopic rods are horizontally placed on the bag-supporting plate and are arranged opposite to the sand bag.

[0014] Preferably, a filter screen is arranged inside the feeding end of the feeding hopper through a support spring, and a spreading mechanism is arranged at the feeding end of the feeding hopper. The spreading mechanism includes a spreading motor installed outside the feeding hopper. The output shaft of the spreading motor is installed with a spreading gear. The spreading gear is rotatably installed outside the feeding hopper. The spreading gear meshes with two symmetrically arranged spreading racks. The spreading racks are connected with a connecting plate. The connecting plate is connected with a spreading plate. The spreading plate is provided with obliquely arranged spreading rods side by side. The spreading rods on the two spreading plates are staggered and have opposite inclination directions. A blind hole is opened at the bottom of the spreading plate. An elastic vibrating part is installed in the blind hole. The elastic vibrating part includes a mounting hollow screw threadedly connected in the blind hole. The bottom of the mounting hollow screw is fixedly connected with one end of a jacking spring. The other end of the jacking spring is connected with a jacking part. The jacking part is spherical or conical;

[0015] The spreading motor is electrically connected to the controller. When the abrasive material falls into the feeding hopper, under the action of the filter screen, the agglomerated abrasive material remains above the filter screen. The spreading motor rotates forward and backward to drive the two spreading plates to reciprocate above the filter screen. At the same time, when the jacking part passes through the mesh holes of the filter screen, under the action of the support spring, the filter screen vibrates, and the agglomerated abrasive material is broken up under the action of the spreading rods. The unbroken abrasive material is crushed under the action of the two spreading plates.

[0016] Preferably, a screw conveyor is arranged at the discharging end of the feeding hopper. The discharging port of the screw conveyor is connected with the mixing tank through a pipeline. The screw conveyor is electrically connected to the controller.

[0017] Preferably, the knife rest includes a fixed rod. A bag-breaking knife is fixed in the middle of the fixed rod. An anti-wear pipe is sleeved on the fixed rod. During the conveying process of the feeding chain conveyor, when the abrasive belt grabbed by the bag-fixing unit passes through the bag-breaking knife, the sand bag is cut in half.

[0018] Preferably, the multi-dimensional mixing mechanism includes a central rotating mixing unit. The central rotating mixing unit is connected with a side horizontal and vertical mixing unit through a linkage assembly. A plurality of side horizontal and vertical mixing units are circumferentially distributed. A partition is arranged inside the mixing tank. The linkage assembly is arranged above the partition. A heat preservation layer is arranged outside the mixing tank.

[0019] Preferably, the central rotating mixing unit includes a mixing motor installed on the mixing tank. The mixing motor is connected with a main mixing shaft. Spiral blades are arranged on the main mixing shaft. The mixing motor is electrically connected to the controller.

[0020] Preferably, the linkage assembly includes a linkage cam and a linkage rod installed on the upper part of the main mixing shaft. A wavy guide groove is opened on the side surface of the linkage cam. One end of the linkage rod is arranged in the wavy guide groove. The other end of the linkage rod is sleeved with a first connecting spring. The first connecting spring is arranged in the vertical sliding groove on the inner wall of the mixing tank through a slider.

[0021] Preferably, the side vertical and horizontal stirring unit includes a mounting rod, the top of the mounting rod is connected to the middle of the linkage rod, several arc-shaped stirring plates are arranged in parallel on the mounting rod, the lowermost arc-shaped stirring plate is connected with a second connecting spring, a fixed column is arranged inside the arc-shaped stirring plate, a telescopic spring is sleeved on the fixed column, and one end of the telescopic spring is installed on the fixed column through a fixing nut, the other end of the telescopic spring is provided with a triangular guard plate, and the second connecting spring is slidably arranged in a horizontal chute on the inner wall of the mixing tank.

[0022] Therefore, by adopting the above-mentioned sand adding device for a shale oil gas fracturing system, the present invention has the following beneficial effects:

[0023] (1) A multi-dimensional stirring mechanism is arranged on the mixing tank. The middle rotating stirring unit in the multi-dimensional stirring mechanism is connected with a side vertical and horizontal stirring unit through a linkage component, and several side vertical and horizontal stirring units are circumferentially distributed, realizing stirring in the rotating, vertical and horizontal dimensions, improving the stirring efficiency, and having a low equipment cost.

[0024] (2) The bag-breaking feeding mechanism includes a feeding chain conveyor and a feeding hopper. Several bag-fixing units are arranged on the feeding chain conveyor. The bag-fixing unit includes two mirror-image bag-fixing components. The bag-fixing component includes a mounting plate, and a telescopic bag-fixing piece is rotatably connected to the mounting plate. A knife rest is arranged on the feeding hopper, and a bag-breaking knife for splitting the sand bag into two halves is arranged in the middle of the knife rest. After directly splitting the sand bag into two halves, under the action of gravity, the telescopic bag-fixing piece moves downward, so that almost all the sand material is introduced into the feeding hopper, and there is no need for a robotic arm to shake the bag body, improving the feeding efficiency.

[0025] The technical solution of the present invention will be further described in detail below with reference to the drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of a sand adding device for a shale oil gas fracturing system according to the present invention;

[0027] Figure 2 is a schematic structural diagram of the bag-breaking feeding mechanism and the mixing and stirring mechanism of the present invention;

[0028] Figure 3 is a schematic structural diagram of the telescopic bag-fixing piece of the present invention;

[0029] Figure 4 is a partial structural diagram of the other end of the baffle of the present invention;

[0030] Figure 5 is a schematic structural diagram of the knife rest of the present invention;

[0031] Figure 6 is a schematic structural diagram of the dispersing plate of the present invention;

[0032] Figure 7Schematic diagram of the multi-dimensional stirring mechanism of the present invention;

[0033] Figure 8 Schematic diagram of the linkage component of the present invention;

[0034] Figure 9 Schematic diagram of the triangular guard plate of the present invention.

[0035] Reference numerals

[0036] 1. Feed chain conveyor; 2. Feed hopper; 21. Support spring; 22. Filter screen; 23. Screw conveyor; 3. Bag-fixing assembly; 31. Mounting plate; 32. Telescopic bag-fixing member; 321. Adjusting telescopic rod; 322. Suction cup; 323. Distance sensor; 324. Trigger projection; 33. Trigger switch; 34. Vibration spring; 35. Return frame; 36. Paddle; 37. Return spring; 38. Return wedge; 39. Bag-supporting plate; 4. Knife rest; 41. Fixed rod; 42. Anti-wear pipe; 43. Bag-breaking knife; 5. Stirring tank; 51. Partition board; 52. Vertical chute; 53. Horizontal chute; 6. Multi-dimensional stirring mechanism; 61. Central rotating stirring unit; 611. Stirring motor; 612. Main stirring shaft; 613. Helical blade; 62. Linkage component; 621. Linkage cam; 622. Linkage rod; 623. Wavy guide groove; 624. First connecting spring; 63. Side vertical and horizontal stirring unit; 631. Mounting rod; 632. Arc-shaped stirring plate; 633. Second connecting spring; 634. Fixed column; 635. Telescopic spring; 636. Fixed nut; 637. Triangular guard plate; 7. Slurry supply pump; 8. Spreading mechanism; 81. Spreading motor; 82. Spreading gear; 83. Spreading rack; 84. Connecting plate; 85. Spreading plate; 86. Spreading rod; 87. Elastic vibration member; 871. Mounting hollow screw; 872. Ejecting spring; 873. Ejecting member. Detailed implementation manners

[0037] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is 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 should not be construed as a limitation on the present invention. In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "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 a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] The following will describe in detail the embodiments of the present invention with reference to the accompanying drawings.

[0039] As Figures 1 - 2 shown, a sand addition device for a shale oil and gas fracturing system includes a controller, a bag-breaking feeding mechanism, and a mixing and stirring mechanism. The bag-breaking feeding mechanism and the mixing and stirring mechanism are both electrically connected to the controller for controlling the corresponding electrical components. The controller is a commonly used component in the prior art, and the specific model is not limited herein.

[0040] The bag-breaking feeding mechanism includes a feeding chain conveyor 1 and a feeding hopper 2. A number of bag-fixing units are provided on the feeding chain conveyor 1. The bag-fixing unit includes two mirror-image bag-fixing components 3. The bag-fixing component 3 includes a mounting plate 31 installed on the feeding chain conveyor 1. A telescopic bag-fixing member 32 is rotatably connected to the mounting plate 31. As Figure 3As shown in the figure, the telescopic bag fixing member 32 includes an adjustable telescopic rod 321 and a suction cup 322 (suitable for plastic bags) provided at the telescopic end of the adjustable telescopic rod 321. In this embodiment, the suction cup 322 is adopted, and it can also be set as a thumb cylinder. The thumb of the thumb cylinder is provided with a hook for inserting into the sandbag (suitable for plastic bags, woven bags, etc.), which is convenient for grasping packaging bags of different materials. The suction cup 322 is connected to an air pump for controlling the adsorption or release of the suction cup 322. A distance sensor 323 is provided on the cylinder body of the adjustable telescopic rod 321, and a trigger protrusion 324 is provided on the cylinder body of the adjustable telescopic rod 321. The trigger protrusion 324 is arranged opposite to the trigger switch 33 of the mounting plate 31. The adjustable telescopic rod 321, the air pump, the distance sensor 323, and the trigger switch 33 are all electrically connected to the controller. When the adjustable telescopic rod 321 is in a horizontal state, the trigger protrusion 324 presses against the trigger switch 33. After the controller receives the trigger signal, it collects the distances between the two sides of the sandbag and the distance sensor 323 through the distance sensor 323. The controller controls the telescopic amount of the adjustable telescopic rod 321 according to the collected distance data, so that the suction cup 322 fits the sandbag, and then starts the air pump to make the suction cup 322 adsorb the sandbag.

[0041] A vibration spring 34 is provided on the mounting plate 31. The vibration spring 34 is arranged opposite to the cylinder body of the adjustable telescopic rod 321 when the telescopic end of the adjustable telescopic rod 321 faces downward. After the sandbag is cut in half, the adjustable telescopic rod 321 changes from a horizontal state to a vertical state and collides with the vibration spring 34, causing the adjustable telescopic rod 321 to vibrate, shaking the remaining sand material into the feed hopper 2, and at the same time playing a role in supporting the adjustable telescopic rod 321. The side wall of the feed hopper 2 is inclined, so that the downwardly inclined adjustable telescopic rod 321 can be smoothly moved out of the feed hopper 2 under the drive of the feed chain conveyor 1. When the adjustable telescopic rod 321 is on the lower chain, under the action of gravity, the telescopic end of the adjustable telescopic rod 321 is vertically downward.

[0042] Two return frames 35 are symmetrically arranged at the feed end of the feed chain conveyor 1. A baffle 36 is provided on the return frame 35. One end of the baffle 36 is fixed on the return frame 35. As Figure 4 shown, a blind hole is provided at the other end of the baffle 36. A return rod is connected in the blind hole through a return spring 37. A return wedge 38 is provided at the top of the return rod. The return wedge 38 is arranged opposite to the cylinder body of the adjustable telescopic rod 321 when the telescopic end of the adjustable telescopic rod 321 faces downward. The bag fixing unit returns to the feed position under the conveyance of the feed chain conveyor 1. A bag supporting plate 39 is provided at the feed end of the feed chain conveyor 1. The feed end of the bag supporting plate 39 is semicircular. The discharge end of the bag supporting plate 39 is arranged opposite to the upper end of the feed hopper 2. When the adjustable telescopic rod 321 moves to the position of the baffle 36, the baffle 36 pushes down the adjustable telescopic rod 321 passing through the return wedge 38, so that the two symmetrically arranged adjustable telescopic rods 321 are horizontally placed on the bag supporting plate 39 and are arranged opposite to the sandbag.

[0043] AsFigure 5 As shown in the figure, a tool rest 4 is provided on the feed hopper 2, and a bag-breaking knife 43 for splitting the sand bag into two halves is provided in the middle of the tool rest 4. The tool rest 4 includes a fixed rod 41, the bag-breaking knife 43 is fixed in the middle of the fixed rod 41, and an anti-wear pipe 42 is sleeved on the fixed rod 41, making it easier for the sand bag to move on the tool rest 4. During the conveying process of the feed chain conveyor 1, when the sand belt grabbed by the bag-fixing unit passes through the bag-breaking knife 43, the sand bag is cut in half.

[0044] Inside the feed end of the feed hopper 2, a filter screen 22 is provided through a support spring 21. A dispersing mechanism 8 is provided at the feed end of the feed hopper 2. The dispersing mechanism 8 includes a dispersing motor 81 installed outside the feed hopper 2. The output shaft of the dispersing motor 81 is equipped with a dispersing gear 82. The dispersing gear 82 is rotatably installed outside the feed hopper 2. The dispersing gear 82 meshes with two symmetrically arranged dispersing racks 83. The dispersing racks 83 are connected to a connecting plate 84. The connecting plate 84 is connected to a dispersing plate 85. The dispersing plate 85 is provided with dispersing rods 86 arranged in parallel and inclined, as Figure 6 shown. The dispersing rods 86 on the two dispersing plates 85 are staggered and have opposite inclined directions. Blind holes are provided at the bottom of the dispersing plate 85, and elastic vibration parts 87 are installed in the blind holes. The elastic vibration parts 87 include mounting hollow screws 871 threadedly connected in the blind holes. The bottom of the mounting hollow screw 871 is fixedly connected to one end of a top spring 872. The other end of the top spring 872 is connected to a top member 873, and the top member 873 is spherical or conical.

[0045] The dispersing motor 81 is electrically connected to the controller. When the sand material falls into the feed hopper 2, under the action of the filter screen 22, the agglomerated sand material remains above the filter screen 22. The positive and reverse rotation of the dispersing motor 81 drives the two dispersing plates 85 to reciprocate above the filter screen 22. At the same time, when the top member 873 passes through the mesh holes of the filter screen 22, under the action of the support spring 21, the filter screen 22 vibrates, accelerating the feeding and facilitating the breaking of agglomerates. The agglomerated sand material is dispersed under the action of the dispersing rods 86, and the undispersed sand material is crushed by the two dispersing plates 85.

[0046] The filtered and broken sand material is conveyed out through a screw conveyor 23 provided at the discharge end of the feed hopper 2. The discharge port of the screw conveyor 23 is connected to the mixing tank 5 through a pipeline. The screw conveyor 23 is electrically connected to the controller to realize the supply of sand material.

[0047] The mixing and stirring mechanism includes a mixing tank 5 connected to the feed hopper 2. A multi-dimensional stirring mechanism 6 is provided on the mixing tank 5, as Figure 7As shown in the figure, the multi-dimensional stirring mechanism 6 includes a central rotating stirring unit 61. The central rotating stirring unit 61 is connected to a side vertical and horizontal stirring unit 63 through a linkage assembly 62. A number of side vertical and horizontal stirring units 63 are circumferentially distributed. A partition 51 is arranged inside the stirring tank 5. The linkage assembly 62 is arranged above the partition 51 to protect the linkage assembly 62. The partition 51 is provided with avoidance holes through which corresponding components pass. A heat preservation layer is arranged outside the stirring tank 5 to prevent the liquid from changing too quickly during mixing and affecting the use effect of the fracturing fluid.

[0048] The central rotating stirring unit 61 includes a stirring motor 611 installed on the stirring tank 5. The stirring motor 611 is connected to a main stirring shaft 612. A spiral blade 613 is arranged on the main stirring shaft 612. The stirring motor 611 is electrically connected to the controller.

[0049] As Figure 8 shown in the figure, the linkage assembly 62 includes a linkage cam 621 and a linkage rod 622 installed on the upper part of the main stirring shaft 612. A wavy guide groove 623 is arranged on the side surface of the linkage cam 621. One end of the linkage rod 622 is arranged in the wavy guide groove 623. A first connecting spring 624 is sleeved on the other end of the linkage rod 622. The first connecting spring 624 is arranged in a vertical sliding groove 52 on the inner wall of the stirring tank 5 through a slider.

[0050] The side vertical and horizontal stirring unit 63 includes a mounting rod 631. The top of the mounting rod 631 is connected to the middle part of the linkage rod 622. A number of arc-shaped stirring plates 632 are arranged in parallel on the mounting rod 631. The lowermost arc-shaped stirring plate 632 is connected to a second connecting spring 633. As Figure 9 shown in the figure, a fixed column 634 is arranged inside the arc-shaped stirring plate 632. A telescopic spring 635 is sleeved on the fixed column 634. One end of the telescopic spring 635 is installed on the fixed column 634 through a fixing nut 636. The other end of the telescopic spring 635 is provided with a triangular guard plate 637. When the spiral blade 613 passes by, the telescopic spring 635 expands and contracts to prevent interference between the spiral blade 613 and the arc-shaped stirring plate 632. The second connecting spring 633 is slidably arranged in a horizontal sliding groove 53 on the inner wall of the stirring tank 5 to realize the up-and-down movement and left-and-right movement of the arc-shaped stirring plate 632, accelerating the liquid turbulence and improving the stirring effect.

[0051] A slurry pump 7 is arranged at the bottom of the stirring tank 5 for supplying the fracturing fluid.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A sand adding device for a shale oil and gas fracturing system, comprising a controller, characterized in that: It also includes a bag breaking and feeding mechanism and a mixing and stirring mechanism, both of which are electrically connected to the controller; The bag breaking and feeding mechanism comprises a feeding chain conveyor and a feeding hopper. The feeding chain conveyor is provided with a plurality of bag fixing units. The bag fixing unit comprises two mirror-image bag fixing components. The bag fixing components comprise a mounting plate mounted on the feeding chain conveyor. A telescopic bag fixing member is rotatably connected to the mounting plate. The feeding hopper is provided with a knife holder. A bag breaking knife for splitting the sandbag into two halves is provided in the middle of the knife holder. The mixing and stirring mechanism comprises a stirring tank connected to the feed hopper, a multi-dimensional stirring mechanism is arranged on the stirring tank, and a slurry supply pump is arranged at the bottom of the stirring tank; The telescopic bag fixing part includes an adjustable telescopic rod and a suction cup or thumb cylinder arranged at the telescopic end of the adjustable telescopic rod, the suction cup or thumb cylinder is connected to an air pump, a distance sensor is arranged on the cylinder body of the adjustable telescopic rod, a trigger protrusion is arranged on the cylinder body of the adjustable telescopic rod, and the trigger protrusion is arranged opposite to the trigger switch of the mounting plate; The adjusting telescopic rod, the air pump, the distance sensor and the trigger switch are all electrically connected to the controller. When the adjusting telescopic rod is in a horizontal state, the trigger protrusion presses against the trigger switch. After receiving the trigger signal, the controller collects the distance between the two sides of the sand bag and the distance sensor through the distance sensor. The controller controls the extension and contraction amount of the adjusting telescopic rod according to the collected distance data, so that the suction cup or the thumb cylinder fits the sand bag, and the air pump is started so that the suction cup adsorbs the sand bag or the thumb cylinder clamps the sand bag. A vibration spring is arranged on the mounting plate, and the vibration spring is arranged opposite to the cylinder body when the telescopic end of the adjusting telescopic rod is facing downward. After the sand bag is cut into two halves, the adjusting telescopic rod turns from a horizontal state to a vertical state and collides with the vibration spring, so that the adjusting telescopic rod vibrates and the remaining sand material falls into the feed hopper; Two return frames are symmetrically arranged at the feeding end of the feeding chain conveyor, and a dial plate is arranged on the return frame, one end of the dial plate is fixed on the return frame, and a blind hole is arranged at the other end of the dial plate, and a return rod is connected with the blind hole through a return spring, and a return wedge is arranged on the top of the return rod, and the return wedge is arranged opposite to the cylinder body when the telescopic end of the adjusting telescopic rod is facing downward, and the bag fixing unit returns to the feeding position under the conveyance of the feeding chain conveyor, and a bag supporting plate is arranged at the feeding end of the feeding chain conveyor, and the feeding end of the bag supporting plate is semicircular, and the discharging end of the bag supporting plate is arranged opposite to the upper end of the feed hopper, and when the adjusting telescopic rod moves to the dial plate position, the dial plate will push down the adjusting telescopic rod passing through the return wedge, so that the two symmetrically arranged adjusting telescopic rods are placed horizontally on the bag supporting plate and arranged opposite to the sand bag.

2. A sand adding device for shale oil and gas fracturing system according to claim 1, characterized in that: A filter screen is arranged in the feed end of the feed hopper through a supporting spring, and a scattering mechanism is arranged in the feed end of the feed hopper, and the scattering mechanism comprises a scattering motor installed on the outside of the feed hopper, and a scattering gear is installed on the output shaft of the scattering motor, and the scattering gear is rotatably installed on the outside of the feed hopper, and the scattering gear is meshed with two symmetrically arranged scattering racks, and the scattering racks are connected with a connecting plate, and the connecting plate is connected with a scattering plate, and obliquely arranged scattering rods are arranged in parallel on the scattering plates, and the scattering rods on the two scattering plates are staggered and inclined in opposite directions, and a blind hole is opened at the bottom of the scattering plate, and an elastic vibrating member is installed in the blind hole, and the elastic vibrating member comprises a hollow screw installed in the blind hole, and the bottom of the hollow screw is fixedly connected to one end of an ejection spring, and the other end of the ejection spring is connected with an ejection member, and the ejection member is spherical or conical; The scattering motor is electrically connected to the controller. When the sand falls into the feed hopper, the agglomerated sand remains above the filter under the action of the filter. The scattering motor drives the two scattering plates to move back and forth above the filter by forward and reverse rotation. At the same time, when the ejector passes through the mesh of the filter, the filter vibrates under the action of the supporting spring, and the agglomerated sand is broken up by the scattering rod, and the unbroken sand is squeezed and crushed by the two scattering plates.

3. A sand adding device for shale oil and gas fracturing system according to claim 2, characterized in that: A screw conveyor is arranged at the discharge end of the feed hopper, the discharge port of the screw conveyor is connected with the stirring tank through a pipeline, and the screw conveyor is electrically connected with the controller.

4. The sand adding device for shale oil and gas fracturing system according to claim 3, characterized in that: The knife holder includes a fixed rod, a bag breaking knife is fixed in the middle of the fixed rod, and an anti-wear tube is sleeved on the fixed rod. During the conveying process of the feeding chain conveyor, when the sand belt grabbed by the bag fixing unit passes through the bag breaking knife, the sand bag is cut into two halves.

5. The sand adding device for shale oil and gas fracturing system according to claim 4, characterized in that: The multi-dimensional stirring mechanism includes a central rotating stirring unit, which is connected to side horizontal and vertical stirring units through a linkage assembly. Several side horizontal and vertical stirring units are distributed circumferentially. A partition is arranged inside the stirring tank, the linkage assembly is arranged above the partition, and an insulation layer is arranged on the outside of the stirring tank.

6. The sand adding device for shale oil and gas fracturing system according to claim 5, characterized in that: The central rotating stirring unit comprises a stirring motor installed on the stirring tank, the stirring motor is connected to a main stirring shaft, the main stirring shaft is provided with spiral blades, and the stirring motor is electrically connected to a controller.

7. The sand adding device for shale oil and gas fracturing system according to claim 6, characterized in that: The linkage assembly includes a linkage cam and a linkage rod installed on the upper part of the main stirring shaft. A wavy guide groove is opened on the side of the linkage cam. One end of the linkage rod is arranged in the wavy guide groove. The other end of the linkage rod is sleeved with a first connecting spring. The first connecting spring is arranged in the vertical slide groove on the inner wall of the stirring tank through a slider.

8. The sand adding device for shale oil and gas fracturing system according to claim 7, characterized in that: The side horizontal and vertical stirring unit includes a mounting rod, the top of the mounting rod is connected to the middle part of the connecting rod, a plurality of arc-shaped stirring plates are arranged in parallel on the mounting rod, the lowest arc-shaped stirring plate is connected to the second connecting spring, a fixed column is arranged on the inner side of the arc-shaped stirring plate, a telescopic spring is sleeved on the fixed column, and one end of the telescopic spring is installed on the fixed column through a fixing nut, a triangular guard plate is arranged on the other end of the telescopic spring, and the second connecting spring is slidably arranged in a horizontal slide groove on the inner wall of the stirring tank.

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