Sand adding device for shale oil and gas fracturing system

Abstract

The invention discloses a sand adding device for a shale oil and gas fracturing system, and belongs to the technical field of shale oil and gas exploitation, the sand adding device comprises a controller, a bag breaking and feeding mechanism and a mixing and stirring mechanism, the bag breaking and feeding mechanism comprises a feeding chain conveyor and a feeding hopper, a plurality of bag fixing units are arranged on the feeding chain conveyor, and the mixing and stirring mechanism is arranged on the feeding chain conveyor; the bag fixing unit comprises two bag fixing assemblies arranged in a mirror image mode, each bag fixing assembly comprises an installation plate installed on the feeding chain conveyor, a telescopic bag fixing piece is rotationally connected to the installation plate, a knife rest is arranged on the feeding hopper, and a bag breaking knife used for splitting a sand bag into two halves is arranged in the middle of the knife rest. The mixing and stirring mechanism comprises a stirring tank connected with 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 the adoption of the sand adding device, stirring in the rotating dimension and the vertical dimension and the transverse dimension is achieved, the stirring efficiency is improved, the equipment cost is low, the bag breaking efficiency is high, and operation is easy.

Description

Technical Field

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

[0002] Fracturing construction refers to a technical means of using high-pressure liquid to control the fracture of underground rocks to increase production capacity and recovery rate during oil and gas well exploitation. In order to increase the output of oil and gas wells, the permeability of porous reservoirs in the formation is enhanced by adding sand, and mortar is injected into the drilling wellbore to form cracks or expand existing cracks, thereby improving the collection efficiency of natural gas or oil.

[0003] In order to ensure a stable flow channel for oil and gas, proppants (such as quartz sand, resin, etc.) are generally provided in the fracturing fluid. During the fracturing construction process, the high-pressure fracturing fluid causes cracks to form in the shale layer. When the pressure of the fracturing fluid is released, the proppants can keep the cracks in an open state to prevent the cracks from closing. The proppants accumulate in the cracks to form a supporting layer with a certain permeability. The oil and gas can flow to the wellbore through the pores and channels between these proppants, so that the oil and gas can flow more smoothly from the formation to the wellhead, thereby increasing the oil and gas production. The existing sand adding device improves the uniformity of stirring by setting a variety of stirring blades. For example, the announcement number CN217725263U discloses a sand adding device for a shale oil and gas fracturing system. The second stirring blade is set to stir and lift the sand material at the bottom, and the material is lifted by the flat plate and stirred by the spiral stirring blade, so that the sand material and the mixed liquid are efficiently stirred evenly. However, the following problems still exist in the prior art: (1) Stirring in two directions is achieved, but the driving components are increased, which increases the equipment cost. At the same time, in order to prevent the stirring blades from interfering with the telescopic cylinder, the stirring blades are made smaller, which reduces the stirring efficiency.

[0004] (2) There is no feeding device, and manual bag breaking and sand adding are used, which is labor-intensive. A mechanical arm is used to grab and break the bags. In order to ensure that the material in the bag falls completely into the hopper, the bag body needs to be shaken at multiple angles, which is inefficient. Summary of the invention

[0005] 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.

[0006] To achieve the above-mentioned purpose, the present invention provides a sand adding device for a shale oil and gas fracturing system, comprising a controller, a bag breaking and feeding mechanism and a mixing and stirring mechanism, wherein the bag breaking and feeding mechanism and the mixing and stirring mechanism are both 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 a 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.

[0007] Preferably, the telescopic bag fixing member comprises 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 retraction 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 starts the air pump so that the suction cup adsorbs the sand bag or the thumb cylinder clamps the sand bag.

[0008] Preferably, a vibration spring is provided 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 is turned 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 is shaken 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.

[0009] Preferably, a filter screen is provided in the feed end of the feed hopper through a supporting spring, and a scattering mechanism is provided at the feed end of the feed hopper, the scattering mechanism comprises a scattering motor installed on the outside of the feed hopper, a scattering gear is installed on the output shaft of the scattering motor, the scattering gear is rotatably installed on the outside of the feed hopper, the scattering gear is meshed with two symmetrically arranged scattering racks, the scattering racks are connected with a connecting plate, the connecting plate is connected with a scattering plate, obliquely arranged scattering rods are arranged in parallel on the scattering plates, the scattering rods on the two scattering plates are staggered and inclined in opposite directions, a blind hole is provided at the bottom of the scattering plate, an elastic vibrating member is installed in the blind hole, the elastic vibrating member comprises a hollow screw installed in a threaded connection in the blind hole, the bottom of the hollow screw installed is fixedly connected to one end of an ejection spring, the other end of the ejection spring is connected to 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.

[0010] Preferably, a screw conveyor is provided at the discharge end of the feed hopper, the discharge port of the screw conveyor is connected to the stirring tank through a pipeline, and the screw conveyor is electrically connected to the controller.

[0011] Preferably, the tool 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 feed 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.

[0012] Preferably, 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, and 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.

[0013] Preferably, the central rotating stirring unit comprises a stirring motor installed on the stirring tank, the stirring motor is connected to a main stirring shaft, a spiral blade is arranged on the main stirring shaft, and the stirring motor is electrically connected to the controller.

[0014] Preferably, 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, and the other end of the linkage rod is sleeved with a first connecting spring, and the first connecting spring is arranged in the vertical slide groove of the inner wall of the stirring tank through a slider.

[0015] Preferably, 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 transverse slide groove on the inner wall of the stirring tank.

[0016] Therefore, the present invention adopts the above-mentioned sand adding device for shale oil and gas fracturing system, which has the following beneficial effects: (1) The stirring tank is provided with a multi-dimensional stirring mechanism. The central rotating stirring unit in the multi-dimensional stirring mechanism is connected to the side horizontal and vertical stirring units through a linkage assembly. Several side horizontal and vertical stirring units are distributed circumferentially, thereby realizing stirring in the rotational, vertical and horizontal dimensions, improving the stirring efficiency, and reducing the equipment cost.

[0017] (2) The bag breaking and feeding mechanism includes 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 includes two mirror-image bag fixing components. The bag fixing components include a mounting plate. A telescopic bag fixing part is rotatably connected to the mounting plate. The feeding hopper is provided with a knife holder. A bag breaking knife for splitting the sand bag into two halves is provided in the middle of the knife holder. After the sand bag is directly split into two halves, the telescopic bag fixing part moves downward under the action of gravity, so that almost all the sand material is introduced into the feeding hopper. There is no need for a mechanical arm to shake the bag body, thereby improving the feeding efficiency.

[0018] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of a sand adding device for a shale oil and gas fracturing system of the present invention; Figure 2 It is a schematic diagram of the structure of the bag breaking feeding mechanism and the mixing and stirring mechanism of the present invention; Figure 3 This is a schematic diagram of the structure of the telescopic solid bag of the present invention; Figure 4 It is a schematic diagram of the local structure of the other end of the paddle of the present invention; Figure 5 It is a schematic diagram of the tool holder structure of the present invention; Figure 6 This is a schematic diagram of the structure of the spreading plate of the present invention; Figure 7 This is a schematic diagram of the structure of the multi-dimensional stirring mechanism of the present invention; Figure 8 It is a schematic diagram of the structure of the linkage assembly of the present invention; Fig. 9 It is a schematic diagram of the triangular guard plate structure of the present invention.

[0020] Reference numerals 1. Feed chain conveyor; 2. Feed hopper; 21. Support spring; 22. Filter; 23. Screw conveyor; 3. Bag fixing assembly; 31. Mounting plate; 32. Telescopic bag fixing member; 321. Adjustable telescopic rod; 322. Suction cup; 323. Distance sensor; 324. Trigger protrusion; 33. Trigger switch; 34. Vibration spring; 35. Return frame; 36. Paddle plate; 37. Return spring; 38. Return wedge; 39. Bag support plate; 4. Knife holder; 41. Fixed rod; 42. Anti-wear pipe; 43. Bag breaking knife; 5. Mixing tank; 51. Partition; 52. Vertical slide; 53. Horizontal slide; 6. Multi-dimensional mixing mechanism; 61. Central rotating mixing unit; 611. Mixing motor; 6 12. Main stirring shaft; 613. Spiral blade; 62. Linking assembly; 621. Linking cam; 622. Linking rod; 623. Wave-shaped guide groove; 624. First connecting spring; 63. Side horizontal and vertical 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. Dispersing mechanism; 81. Dispersing motor; 82. Dispersing gear; 83. Dispersing rack; 84. Connecting plate; 85. Dispersing plate; 86. Dispersing rod; 87. Elastic vibrating member; 871. Install hollow screw; 872. Ejector spring; 873. Ejector. DETAILED DESCRIPTION

[0021] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the invented product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "setting", "installation", and "connection" 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 a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the 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.

[0022] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0023] like Figure 1-Figure 2As shown, a sand adding device for a shale oil and gas fracturing system includes 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 for controlling corresponding electrical components. The controller is a commonly used component in the prior art and the specific model is not limited here.

[0024] The bag breaking feeding mechanism comprises a feeding chain conveyor 1 and a feeding hopper 2. The feeding chain conveyor 1 is provided with a plurality of bag fixing units. The bag fixing unit comprises two mirror-image-arranged bag fixing components 3. The bag fixing component 3 comprises a mounting plate 31 mounted on the feeding chain conveyor 1. A telescopic bag fixing component 32 is rotatably connected to the mounting plate 31. Figure 3 As shown, the telescopic bag fixing member 32 includes an adjustable telescopic rod 321 and a suction cup 322 (suitable for plastic bags) arranged at the telescopic end of the adjustable telescopic rod 321. The suction cup 322 is used in this embodiment and can also be set as a thumb cylinder. The thumb of the thumb cylinder is provided with a hook for inserting a sand bag (suitable for plastic bags, woven bags, etc.) to facilitate the grabbing of 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 receiving the trigger signal, the controller collects the distance between the two sides of the sand bag and the distance sensor 323 through the distance sensor 323. The controller controls the extension and contraction amount of the adjustable telescopic rod 321 according to the collected distance data, so that the suction cup 322 fits the sand bag, and the air pump is started to make the suction cup 322 adsorb the sand bag.

[0025] A vibration spring 34 is arranged on the mounting plate 31, and the vibration spring 34 is arranged opposite to the cylinder body when the telescopic end of the adjusting telescopic rod 321 is facing downward. After the sand bag is cut in half, the adjusting telescopic rod 321 changes from a horizontal state to a vertical state, and collides with the vibration spring 34, so that the adjusting telescopic rod 321 vibrates, and the remaining sand material is shaken into the feed hopper 2, and at the same time plays a role in supporting the adjusting telescopic rod 321. The side wall of the feed hopper 2 is inclined, so that the downwardly inclined adjusting telescopic rod 321 can be driven by the feed chain conveyor 1 and smoothly moved out of the feed hopper 2. When the adjusting telescopic rod 321 is on the chain below, the telescopic end of the adjusting telescopic rod 321 is vertically downward under the action of gravity.

[0026] The feeding end of the feeding chain conveyor 1 is symmetrically provided with two return frames 35, and a shift plate 36 is provided on the return frame 35, and one end of the shift plate 36 is fixed on the return frame 35. Figure 4As shown, a blind hole is provided at the other end of the paddle plate 36, and a return rod is connected to the blind hole through a return spring 37. A return wedge 38 is provided on the top of the return rod. The return wedge 38 is arranged opposite to the cylinder body when the telescopic end of the adjusting telescopic rod 321 is facing downward, and the bag fixing unit returns to the feeding position under the conveyance of the feeding chain conveyor 1. A bag supporting plate 39 is provided at the feeding end of the feeding chain conveyor 1. The feeding end of the bag supporting plate 39 is semicircular, and the discharging end of the bag supporting plate 39 is arranged opposite to the upper end of the feeding hopper 2. When the adjusting telescopic rod 321 moves to the position of the paddle plate 36, the paddle plate 36 pushes down the adjusting telescopic rod 321 passing through the return wedge 38, so that the two symmetrically arranged adjusting telescopic rods 321 are horizontally placed on the bag supporting plate 39 and arranged opposite to the sandbag.

[0027] like Figure 5 As shown, a knife holder 4 is provided on the feed hopper 2, and a bag breaking knife 43 for splitting the sandbag into two halves is provided in the middle of the knife holder 4. The knife holder 4 includes a fixed rod 41, and a bag breaking knife 43 is fixed in the middle of the fixed rod 41. An anti-wear tube 42 is sleeved on the fixed rod 41, so that the sandbag is easier to move on the knife holder 4. During the conveying process of the feeding chain conveyor 1, when the sand belt grabbed by the bag fixing unit passes through the bag breaking knife 43, the sandbag is cut into two halves.

[0028] A filter screen 22 is provided in the feed end of the feed hopper 2 through a support spring 21, and a scattering mechanism 8 is provided at the feed end of the feed hopper 2. The scattering mechanism 8 includes a scattering motor 81 installed on the outside of the feed hopper 2, and a scattering gear 82 is installed on the output shaft of the scattering motor 81. The scattering gear 82 is rotatably installed on the outside of the feed hopper 2, and the scattering gear 82 is meshed with two symmetrically arranged scattering racks 83. The scattering rack 83 is connected to a connecting plate 84, and the connecting plate 84 is connected to a scattering plate 85. The scattering plate 85 is provided with obliquely arranged scattering rods 86 in parallel, such as Figure 6 As shown, the scattering rods 86 on the two scattering plates 85 are staggered and inclined in opposite directions. A blind hole is provided at the bottom of the scattering plate 85, and an elastic vibrating member 87 is installed in the blind hole. The elastic vibrating member 87 includes a hollow mounting screw 871 threadedly connected in the blind hole. The bottom of the hollow mounting screw 871 is fixedly connected to one end of an ejection spring 872. The other end of the ejection spring 872 is connected to an ejection member 873, and the ejection member 873 is spherical or conical.

[0029] The scattering 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 scattering motor 81 drives the two scattering plates 85 to move back and forth above the filter screen 22 in forward and reverse rotation. At the same time, when the ejector 873 passes through the mesh of the filter screen 22, under the action of the supporting spring 21, the filter screen 22 vibrates, which speeds up the feeding and facilitates the breaking of agglomerates. The agglomerated sand material is broken up by the action of the scattering rod 86, and the unbroken sand material is squeezed and broken by the action of the two scattering plates 85.

[0030] The filtered and crushed sand material is conveyed out through a screw conveyor 23 arranged at the discharge end of the feed hopper 2. The discharge port of the screw conveyor 23 is connected to the stirring tank 5 through a pipeline. The screw conveyor 23 is electrically connected to the controller to realize the supply of the sand material.

[0031] The mixing and stirring mechanism comprises a stirring tank 5 connected to the feed hopper 2, and a multi-dimensional stirring mechanism 6 is arranged on the stirring tank 5. Figure 7 As shown, the multi-dimensional stirring mechanism 6 includes a central rotating stirring unit 61, which is connected to a side horizontal and vertical stirring unit 63 through a linkage assembly 62, and a plurality of side horizontal and vertical stirring units 63 are distributed circumferentially. A partition 51 is arranged inside the stirring tank 5, and a linkage assembly 62 is arranged above the partition 51 to protect the linkage assembly 62. The partition 51 is provided with avoidance holes for corresponding components to pass through. An insulation layer is arranged on the outside of the stirring tank 5 to prevent the liquid from changing too quickly during mixing and affecting the use effect of the fracturing fluid.

[0032] 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 . The main stirring shaft 612 is provided with a spiral blade 613 . The stirring motor 611 is electrically connected to a controller.

[0033] like Figure 8 As shown, 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 provided on the side of the linkage cam 621. One end of the linkage rod 622 is arranged in the wavy guide groove 623. The other end of the linkage rod 622 is sleeved with a first connecting spring 624. The first connecting spring 624 is arranged in the vertical slide groove 52 on the inner wall of the stirring tank 5 through a slider.

[0034] The side horizontal and vertical stirring unit 63 includes a mounting rod 631, the top of the mounting rod 631 is connected to the middle of the linkage rod 622, and a plurality of arc-shaped stirring plates 632 are arranged in parallel on the mounting rod 631, and the bottom arc-shaped stirring plate 632 is connected to a second connecting spring 633, such as Fig. 9 As shown, a fixed column 634 is provided inside the arc-shaped stirring plate 632, and a telescopic spring 635 is sleeved on the fixed column 634, and one end of the telescopic spring 635 is mounted on the fixed column 634 through a fixing nut 636, and a triangular guard plate 637 is provided at the other end of the telescopic spring 635. When the spiral blade 613 passes, the telescopic spring 635 is extended and retracted to avoid mutual interference between the spiral blade 613 and the arc-shaped stirring plate 632. The second connecting spring 633 is slidably arranged in the transverse slide groove 53 on the inner wall of the stirring tank 5, so that the arc-shaped stirring plate 632 can move up and down while moving left and right, thereby accelerating the turbulence of the liquid and improving the stirring effect.

[0035] A slurry supply pump 7 is provided at the bottom of the stirring tank 5 for supplying fracturing fluid.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution 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 a 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.

2. A sand adding device for shale oil and gas fracturing system according to claim 1, characterized in that: 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 retraction 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 starts the air pump so that the suction cup adsorbs the sand bag or the thumb cylinder clamps the sand bag.

3. A sand adding device for shale oil and gas fracturing system according to claim 2, characterized in that: 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.

4. The sand adding device for shale oil and gas fracturing system according to claim 3, 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.

5. The sand adding device for shale oil and gas fracturing system according to claim 4, 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.

6. The sand adding device for shale oil and gas fracturing system according to claim 5, 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.

7. The sand adding device for shale oil and gas fracturing system according to claim 6, 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.

8. The sand adding device for shale oil and gas fracturing system according to claim 7, 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.

9. The sand adding device for shale oil and gas fracturing system according to claim 8, 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.

10. The sand adding device for shale oil and gas fracturing system according to claim 9, 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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