Automatic sand adding device for fracturing

Abstract

The invention discloses an automatic sand adding device for fracturing, belongs to the technical field of petroleum and natural gas fracturing equipment, and provides the following scheme that the automatic sand adding device comprises a sand adding conveying bin, a sand adding conveying mechanism is arranged in the sand adding conveying bin, the sand adding conveying mechanism comprises a driving assembly, and the driving assembly transversely penetrates through the sand adding conveying bin; the two sides of the driving assembly are each provided with an active adjusting assembly, the active adjusting assemblies penetrate into the sand adding and conveying bin and are connected with a passive vibration assembly, and one side of each passive vibration assembly is connected with an elastic spiral blade. The elastic spiral blade is driven by the driving assembly to move, so that the elastic spiral blade can smoothly carry out sand conveying operation, the elastic spiral blade can drive the passive adjusting disc to move, and vibration effects with different frequencies are generated between the protruding structures and the walking balls due to the fact that the thicknesses of the protruding structures are different; therefore, stable sand conveying operation can be ensured through vibration of the elastic spiral blades, and continuous sand source guarantee is provided for subsequent fracturing operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas fracturing equipment, and particularly relates to an automatic sand adding device for fracturing. BACKGROUND

[0002] In fracturing operation, the automatic sand adding device is the core equipment for ensuring the sand carrying performance of the fracturing fluid, and the continuity and stability of sand particle conveying directly affect the fracturing effect. The existing automatic sand adding device for fracturing has some problems in use, for example, the sand particles are prone to agglomeration due to static electricity, humidity and other factors in the spiral conveying process, which causes the conveying channel to be blocked, frequent shutdown for cleaning is required, and the sand adding efficiency is seriously affected. At the same time, the spiral pitch of the spiral conveying mechanism is fixed, which cannot adapt to the conveying requirements of sand particles of different thickness, resulting in unstable sand particle conveying amount, and further affecting the quality and efficiency of fracturing operation.

[0003] In view of the above problems, the present application provides an automatic sand adding device for fracturing. SUMMARY

[0004] The present application aims to solve the problems of the existing automatic sand adding device for fracturing, such as the sand particles being prone to agglomeration due to static electricity, humidity and other factors in the spiral conveying process, causing the conveying channel to be blocked, frequent shutdown for cleaning being required, and the sand adding efficiency being seriously affected. At the same time, the spiral pitch of the spiral conveying mechanism is fixed, which cannot adapt to the conveying requirements of sand particles of different thickness, resulting in unstable sand particle conveying amount, and further affecting the quality and efficiency of fracturing operation.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme: An automatic sand adding device for fracturing comprises a sand adding conveying hopper, and a sand adding conveying mechanism is arranged in the sand adding conveying hopper. The sand adding conveying mechanism comprises a driving assembly, the driving assembly transversely penetrates the sand adding conveying hopper, both sides of the driving assembly are provided with a driving adjusting assembly, the driving adjusting assembly penetrates into the sand adding conveying hopper and is connected with a passive vibration assembly, one side of the passive vibration assembly is connected with an elastic spiral blade, the passive vibration assembly is moved by the driving adjusting assembly, and the spiral pitch of the elastic spiral blade is smoothly adjusted due to the elastic ductility of the elastic spiral blade. The elastic spiral blade is sleeved on the spiral machine transmission shaft of the driving assembly, and the opposite ends of the two elastic spiral blades are fixedly installed on the spiral machine transmission shaft, the passive vibration assembly is continuously conveyed by the vibration of the elastic spiral blade through the rotation of the elastic spiral blade.

[0006] Preferably, two fixed bases are fixedly connected below the sand adding conveying hopper, and a sand discharging port is arranged in the middle of the lower part of the sand adding conveying hopper.

[0007] Preferably, two groups of screw conveyor protective covers are fixedly installed in the sand feeding bin by bolts, each group of screw conveyor protective covers is arranged above the elastic screw blade, and a conveying cavity is formed between the screw conveyor protective cover and the lower cavity of the sand feeding bin, and the number of each group of screw conveyor protective covers is two.

[0008] Preferably, the spiral arrangement modes of the two elastic screw blades are opposite.

[0009] Preferably, two rain shed mounting frame structures are fixedly connected above the sand feeding bin, and a telescopic step structure is arranged below the sand feeding bin.

[0010] Preferably, the driving assembly comprises a driving motor and two mounting seats, the mounting seats are fixedly connected to the fixed base, the driving motor is mounted on one of the mounting seats, a screw conveyor transmission shaft is fixedly connected to the output shaft of the driving motor, the screw conveyor transmission shaft is rotatably mounted on the two sides of the sand feeding bin and the other mounting seat through three bearings respectively, and the middle part of the screw conveyor transmission shaft is also rotatably mounted on the connecting plate through a bearing, and the connecting plate is fixedly mounted in the sand feeding bin.

[0011] Preferably, the passive vibration assembly comprises a driving adjusting disc, a passive adjusting disc and a second rotating sleeve, the second rotating sleeve is rotatably mounted on the driving adjusting disc through a bearing, a plurality of protruding structures are fixedly connected to one side of the driving adjusting disc, walking balls are arranged on one side of the passive adjusting disc, and the walking balls are in contact with the protruding structures; One end of the elastic screw blade is fixedly connected to the passive adjusting disc, a first rotating sleeve is fixedly mounted on the passive adjusting disc, the first rotating sleeve and the second rotating sleeve are slidably connected to the screw conveyor transmission shaft, a spring is fixedly connected to one side of the first rotating sleeve, and one end of the spring is fixedly connected to the inner ring of the bearing connected to the second rotating sleeve.

[0012] Preferably, the shape of the screw conveyor transmission shaft is a polygonal structure, and the shapes of the first rotating sleeve and the second rotating sleeve are matched with the shape of the screw conveyor transmission shaft.

[0013] Preferably, the driving adjusting assembly comprises a movable plate, an adjusting nut is fixedly mounted on the movable plate, the adjusting nut is threadedly connected to an adjusting screw, both adjusting screws are rotatably mounted on the driving motor and the other mounting seat through bearings respectively, and an operating handle is fixedly connected to one end of the adjusting screw.

[0014] Preferably, one side of the movable plate is fixedly connected with three guide rods, two of which are slidably connected in two guide sleeves respectively, the two guide sleeves and the other two guide sleeves are fixedly connected with the driving motor and the other mounting seat respectively, the other two guide rods are slidably arranged on the two mounting seats respectively, and the three guide rods are arranged out of the mounting sleeve and fixedly connected with the driving adjusting disc.

[0015] Compared with the prior art, the automatic sand feeding device for fracturing has the following beneficial effects: 1. The automatic sand feeding device for fracturing drives the elastic spiral blade to move through the driving assembly, so that the elastic spiral blade can smoothly perform sand feeding operation, and the elastic spiral blade can drive the passive adjusting disc to move. Since the thicknesses of the protruding structures are different, different frequency vibration effects are generated between the protruding structures and the walking balls. In this way, the stable sand feeding operation can be ensured through the vibration of the elastic spiral blade, and continuous sand source guarantee is provided for subsequent fracturing operation.

[0016] 2. The automatic sand feeding device for fracturing drives the passive vibration assembly to move through the driving assembly, so that the passive vibration assembly drives the elastic spiral blade to move. Since the elastic spiral blade has a certain elastic force, the spiral pitch of the elastic spiral blade can be adjusted. In this way, the conveying requirements of different coarse and fine sand particles can be adapted, and the adaptation ability of the device to diversified fracturing sand is significantly improved.

[0017] 3. The automatic sand feeding device for fracturing drives the elastic spiral blade to rotate through the driving assembly, so that the elastic spiral blade can smoothly perform sand feeding operation. In addition, the elastic spiral blade can also control the passive vibration assembly to work, so that the passive vibration assembly drives the elastic spiral blade to vibrate at different frequencies. Furthermore, the spiral pitch of the elastic spiral blade can be adjusted through the passive vibration assembly by the driving assembly. The multi-frequency vibration and the spiral pitch adjustment form a complementary effect, which improves the stability and efficiency of sand particle conveying. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a perspective view of the automatic sand feeding device for fracturing proposed in the present application; Figure 2 It is a top perspective view of the sand feeding hopper of the automatic sand feeding device for fracturing proposed in the present application; Figure 3 It is a bottom perspective view of the sand feeding hopper of the automatic sand feeding device for fracturing proposed in the present application; Figure 4 It is a sectional perspective view of the automatic sand feeding device for fracturing proposed in the present application; Figure 5 It is a sectional perspective view of the sand feeding hopper of the automatic sand feeding device for fracturing proposed in the present application; Figure 6 A perspective view of a driving assembly of an automatic sand adding device for fracturing according to the present application is provided; Figure 7 A cross-sectional perspective view of a passive vibration assembly of an automatic sand adding device for fracturing according to the present application is provided; Figure 8 A perspective view of an adjusting assembly of an automatic sand adding device for fracturing according to the present application is provided; Figure 9 A perspective view of a driving adjusting disc of an automatic sand adding device for fracturing according to the present application is provided.

[0019] In the figure: 100, sand adding feeding bin; 101, canopy mounting frame structure; 102, telescopic step structure; 103, fixed base; 104, screw conveyor protective cover; 105, sand discharging port; 200, sand adding conveying mechanism; 201, driving assembly; 2011, driving motor; 2012, screw conveyor transmission shaft; 2013, mounting seat; 2014, connecting plate; 202, active adjusting assembly; 2021, adjusting screw; 2022, adjusting nut; 2023, movable plate; 2024, operating handle; 2025, guide sleeve; 2026, guide rod; 2027, mounting sleeve; 203, passive vibration assembly; 2031, first rotating sleeve; 2032, passive adjusting disc; 2033, second rotating sleeve; 2034, active adjusting disc; 2035, spring; 2036, protruding structure; 2037, walking ball; 204, elastic screw blade. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0021] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0022] Example 1: Reference Figures 1-7 and Figure 9The utility model provides an automatic sand adding device for fracturing, including sand adding feeding bin 100, two fixed bases 103 are fixedly connected below sand adding feeding bin 100, sand material discharge port 105 is arranged in the middle below sand adding feeding bin 100, sand material can be smoothly discharged through sand material discharge port 105, and sand material can be smoothly discharged into fracturing equipment, two groups of screw conveyor protective cover 104 are fixedly installed in sand adding feeding bin 100 through bolt, each group of screw conveyor protective cover 104 is arranged above elastic screw blade 204 respectively, and the conveying cavity is formed between screw conveyor protective cover 104 and the lower cavity of sand adding feeding bin 100, the number of each group of screw conveyor protective cover 104 is two, the elastic screw blade 204 can be quickly and stably started through screw conveyor protective cover 104, and sand conveying operation is facilitated, two canopy mounting frame structures 101 are fixedly connected above sand adding feeding bin 100, rain canopy can be installed through canopy mounting frame structure 101, so weather of raining day can be adapted, retractable step structure 102 is arranged below sand adding feeding bin 100, the retractable step structure 102 is drawn out from the lower side of sand adding feeding bin 100, so that sand conveying condition can be observed, and equipment inspection and maintenance are facilitated, sand adding conveying mechanism 200 is arranged in sand adding feeding bin 100, Sand adding conveying mechanism 200 includes drive assembly 201, drive assembly 201 includes drive motor 2011 and two mounting seats 2013, mounting seat 2013 is fixedly connected on fixed base 103, drive motor 2011 is installed on one of mounting seat 2013, the output shaft of drive motor 2011 is fixedly connected with screw machine transmission shaft 2012, screw machine transmission shaft 2012 can keep stable rotation through bearing, so that the sand conveying operation of elastic screw blade 204 is stable, screw machine transmission shaft 2012 is rotatably installed on the two sides of sand adding feeding bin 100 and another mounting seat 2013 through three bearings respectively, the middle part of screw machine transmission shaft 2012 is also rotatably installed on connecting plate 2014 through bearing, connecting plate 2014 is fixedly installed in sand adding feeding bin 100, and drive assembly 201 crosses sand adding feeding bin 100; The driving assembly 201 is provided with a driving adjusting assembly 202 on both sides, the driving adjusting assembly 202 is arranged into the sand feeding bin 100, the sand can be temporarily stored through the sand feeding bin 100, the sand feeding operation of the elastic spiral blade 204 is facilitated, and the driving adjusting assembly 202 is connected with the passive vibration assembly 203. The passive vibration assembly 203 comprises a driving adjusting disc 2034, a passive adjusting disc 2032 and a second rotating sleeve 2033. The second rotating sleeve 2033 is rotatably arranged on the driving adjusting disc 2034 through a bearing. The second rotating sleeve 2033 can rotate smoothly through the bearing, so that the spiral machine transmission shaft 2012 can rotate smoothly. A plurality of protruding structures 2036 are fixedly connected to one side of the driving adjusting disc 2034. The thickness of the protruding structures 2036 is designed to be different, so that the walking ball 2037 can be switched and pressed between the protruding structures 2036 during rotation, thereby realizing vibration operation of different frequencies. The passive adjusting disc 2032 is provided with the walking ball 2037 on one side. The walking ball 2037 is in contact with the protruding structure 2036. One end of the elastic spiral blade 204 is fixedly connected to the passive adjusting disc 2032. The first rotating sleeve 2031 is fixedly arranged on the passive adjusting disc 2032. The first rotating sleeve 2031 and the second rotating sleeve 2033 are slidably connected to the spiral machine transmission shaft 2012. The spring 2035 is fixedly connected to one side of the first rotating sleeve 2031. The passive adjusting disc 2032 can be reset smoothly through the elastic reset force of the spring 2035, so that the walking ball 2037 is attached to the driving adjusting disc 2034, and the walking ball 2037 can be reciprocally pressed between the protruding structures 2036 during rotation. One end of the spring 2035 is connected to the bearing inner ring connected with the second rotating sleeve 2033, so that the spring 2035 can rotate with the bearing inner ring, thereby preventing the spring 2035 from being damaged due to torsion. One end of the spring 2035 is fixedly connected to the bearing inner ring connected with the second rotating sleeve 2033. The spiral machine transmission shaft 2012 is in a polygonal structure. The shapes of the first rotating sleeve 2031 and the second rotating sleeve 2033 are adapted to the shape of the spiral machine transmission shaft 2012. The first rotating sleeve 2031 and the second rotating sleeve 2033 can rotate with the spiral machine transmission shaft 2012 through the polygonal structure of the spiral machine transmission shaft 2012, thereby driving the passive adjusting disc 2032 to rotate, so that the walking ball 2037 can be smoothly pressed between the protruding structures 2036, thereby realizing the vibration of the elastic spiral blade 204. The first rotating sleeve 2031 and the second rotating sleeve 2033 can also slide on the spiral machine transmission shaft 2012, thereby enabling the elastic spiral blade 204 to adjust the spiral spacing smoothly. The passive vibration assembly 203 is connected with the elastic spiral blade 204 on one side. The spiral arrangement modes of the two elastic spiral blades 204 are opposite. The two elastic spiral blades 204 are arranged in opposite directions, so that the elastic spiral blades 204 can uniformly feed sand to the middle, and the sand can be smoothly discharged through the sand outlet 105. The driving adjusting assembly 202 drives the passive vibration assembly 203 to move,Due to the elastic spiral blade 204 has elastic ductility, the spiral pitch of the elastic spiral blade 204 is adjusted smoothly. The elastic spiral blade 204 is sleeved on the spiral machine transmission shaft 2012 of the driving assembly 201, and the opposite ends of the two elastic spiral blades 204 are fixedly installed on the spiral machine transmission shaft 2012. Through the rotation of the elastic spiral blade 204, the passive vibration assembly 203 assists the elastic spiral blade 204 to vibrate to continuously perform the conveying operation.

[0023] In the embodiment: the driving motor 2011 drives the spiral machine transmission shaft 2012 to rotate, the spiral machine transmission shaft 2012 drives the elastic spiral blade 204 to move, so that the elastic spiral blade 204 can smoothly perform the sand conveying operation, and the elastic spiral blade 204 can drive the passive adjusting disc 2032 to rotate, the passive adjusting disc 2032 drives the walking ball 2037 to rotate, so that the walking ball 2037 and the convex structure 2036 are extruded, and after the walking ball 2037 and the convex structure 2036 are staggered, the spring 2035 drives the walking ball 2037 to reset, so that the walking ball 2037 and the convex structure 2036 can smoothly perform the reciprocating extrusion movement, and because the thickness of each convex structure 2036 is different, the convex structure 2036 and the walking ball 2037 produce different frequency vibration effects, so that the vibration of the elastic spiral blade 204 can ensure stable sand conveying operation and provide continuous sand source guarantee for subsequent fracturing operation.

[0024] Embodiment 2: refer to Figure 8The application discloses an automatic sand adding device for fracturing, which comprises a driving adjusting assembly 202, the driving adjusting assembly 202 comprises a movable plate 2023, an adjusting nut 2022 is fixedly installed on the movable plate 2023, and the adjusting nut 2022 is in threaded transmission with an adjusting screw 2021, so that the movable plate 2023 can be smoothly driven to move, the adjusting nut 2022 is in threaded connection with the adjusting screw 2021, and the two adjusting screws 2021 are rotatably installed on a driving motor 2011 and another mounting seat 2013 through bearings respectively, the bearings can ensure that the adjusting screw 2021 rotates stably, so that the adjusting screw 2021 and the adjusting nut 2022 are in stable transmission, one end of the adjusting screw 2021 is fixedly connected with an operating handle 2024, the operating handle 2024 can provide a force point for a worker, so that the worker can conveniently operate the adjusting screw 2021 to rotate through the operating handle 2024, one side of the movable plate 2023 is fixedly connected with three guide rods 2026, two guide rods 2026 are slidably connected in two guide sleeves 2025 respectively, the guide sleeves 2025 can guide the guide rods 2026, so that the guide rods 2026 keep stable movement, the two guide sleeves 2025 and other two guide sleeves 2025 are fixedly connected on the driving motor 2011 and the other mounting seat 2013 respectively, the other two guide rods 2026 are slidably arranged on the two mounting seats 2013 respectively, and the three guide rods 2026 pass through a mounting sleeve 2027 and are fixedly connected with a driving adjusting disc 2034, the mounting sleeve 2027 is mounted on a sand adding and feeding bin 100.

[0025] In the embodiment, the adjusting screw 2021 can be rotated through the operating handle 2024, the adjusting screw 2021 is in threaded transmission with the adjusting nut 2022, the adjusting nut 2022 drives the movable plate 2023 to move, the movable plate 2023 drives the guide rods 2026 to move, the guide rods 2026 drive the passive vibration assembly 203 to move, the passive vibration assembly 203 drives the elastic spiral leaves 204 to move, the spiral spacing of the elastic spiral leaves 204 can be adjusted due to the elastic force of the elastic spiral leaves 204, so that the conveying requirements of sand particles with different thicknesses can be adapted, and the adaptation ability of the device to diversified fracturing sand is remarkably improved.

[0026] Embodiment 3: refer to Figures 2-6The utility model provides an automatic sand adding device for fracturing, which comprises a sand adding conveying mechanism 200, the sand adding conveying mechanism 200 comprises a driving assembly 201, the driving assembly 201 crosses a sand adding conveying bin 100, and the two sides of the driving assembly 201 are provided with active adjusting assemblies 202, the active adjusting assemblies 202 are arranged in the sand adding conveying bin 100, and are connected with passive vibration assemblies 203, one side of the passive vibration assemblies 203 is connected with elastic spiral leaves 204, the passive vibration assemblies 203 are driven to move by the active adjusting assemblies 202, and the spiral interval of the elastic spiral leaves 204 is adjusted smoothly due to the elastic ductility of the elastic spiral leaves 204. The elastic spiral leaves 204 are sleeved on the screw machine transmission shaft 2012 of the driving assembly 201, and the opposite ends of the two elastic spiral leaves 204 are fixedly installed on the screw machine transmission shaft 2012, the passive vibration assemblies 203 are vibrated to assist the elastic spiral leaves 204 to continuously convey by the rotation of the elastic spiral leaves 204.

[0027] In the embodiment, the elastic spiral leaves 204 are driven to rotate by the driving assembly 201, so that the elastic spiral leaves 204 can smoothly convey sand, and the passive vibration assemblies 203 are controlled to work by the elastic spiral leaves 204, so that the passive vibration assemblies 203 drive the elastic spiral leaves 204 to vibrate at different frequencies, and the active adjusting assemblies 202 can also adjust the spiral interval of the elastic spiral leaves 204 through the passive vibration assemblies 203, so that the vibration at multiple frequencies and the adjustment of the spiral interval complement each other, and the stability and efficiency of sand conveying are improved.

[0028] Working principle: before sand adding, the adjusting screw 2021 is rotated by operating the handle 2024, threaded transmission is formed between the adjusting screw 2021 and the adjusting nut 2022, the adjusting nut 2022 drives the movable plate 2023 to move, the movable plate 2023 drives the guide rod 2026 to move, the guide rod 2026 drives the active adjusting disc 2034 to move, the active adjusting disc 2034 drives the passive adjusting disc 2032 to move through the convex structure 2036 and the walking ball 2037, the passive adjusting disc 2032 drives the elastic spiral leaves 204 to elastically stretch and contract, so that the spiral interval of the elastic spiral leaves 204 can be adjusted smoothly, and the sand conveying requirement is met. When the sanding operation needs to be carried out on the fracturing equipment, the sand is poured into both ends of the sanding conveying bin 100, and the driving motor 2011 is controlled to operate, the driving motor 2011 drives the screw machine transmission shaft 2012 to rotate, the screw machine transmission shaft 2012 drives the elastic screw blade 204 to rotate, the elastic screw blade 204 performs sand conveying operation, and the rotation of the elastic screw blade 204 also drives the passive adjusting disc 2032 to rotate, the passive adjusting disc 2032 drives the walking ball 2037 to move, so that the walking ball 2037 can generate extrusion movement with the convex structure 2036, and the spring 2035 can be cooperated to smoothly reciprocate the extrusion between the walking ball 2037 and the convex structure 2036, so as to make the passive adjusting disc 2032 drive the elastic screw blade 204 to perform vibration sand conveying operation, so that the sand is discharged through the sand outlet 105 and then enters the fracturing equipment.

[0029] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. An automatic sand feeding device for fracturing, comprising a sand feeding and conveying hopper (100), characterized in that, The sand conveying silo (100) is equipped with a sand conveying mechanism (200); The sand conveying mechanism (200) includes a drive assembly (201), which traverses the sand conveying hopper (100). Both sides of the drive assembly (201) are provided with active adjustment assemblies (202). The active adjustment assemblies (202) pass through the sand conveying hopper (100) and are connected to the passive vibration assembly (203). One side of the passive vibration assembly (203) is connected to an elastic spiral blade (204). The active adjustment assemblies (202) drive the passive vibration assembly (203) to move. Since the elastic spiral blade (204) has elastic extensibility, the spiral spacing of the elastic spiral blade (204) can be smoothly adjusted. The elastic spiral blade (204) is sleeved on the screw conveyor shaft (2012) of the drive assembly (201), and the opposite ends of the two elastic spiral blades (204) are fixedly installed on the screw conveyor shaft (2012). By rotating the elastic spiral blade (204), the passive vibration assembly (203) assists the elastic spiral blade (204) to vibrate for continuous conveying operation.

2. The automatic sand-feeding device for fracturing according to claim 1, characterized in that, Two fixed bases (103) are fixedly connected to the bottom of the sand conveying hopper (100), and a sand discharge port (105) is provided in the middle of the bottom of the sand conveying hopper (100).

3. The automatic sand-feeding device for fracturing according to claim 1, characterized in that, Two sets of screw conveyor guards (104) are fixedly installed in the sand conveying hopper (100) by bolts. Each set of screw conveyor guards (104) is set above the elastic screw blade (204), and a conveying cavity is formed between the screw conveyor guards (104) and the lower cavity of the sand conveying hopper (100). There are two screw conveyor guards (104) in each set.

4. The automatic sand-feeding device for fracturing according to claim 1, characterized in that, The two elastic helical blades (204) are arranged in opposite helical patterns.

5. An automatic sand-feeding device for fracturing according to claim 1, characterized in that, Two canopy mounting frame structures (101) are fixedly connected above the sand conveying hopper (100), and a telescopic step structure (102) is provided below the sand conveying hopper (100).

6. An automatic sand-feeding device for fracturing according to claim 2, characterized in that, The drive assembly (201) includes a drive motor (2011) and two mounting seats (2013). The mounting seats (2013) are fixedly connected to the fixed base (103). The drive motor (2011) is mounted on one of the mounting seats (2013). The output shaft of the drive motor (2011) is fixedly connected to a screw conveyor shaft (2012). The screw conveyor shaft (2012) is rotatably mounted on both sides of the sand conveying hopper (100) and on the other mounting seat (2013) via three bearings. The middle part of the screw conveyor shaft (2012) is also rotatably mounted on a connecting plate (2014) via bearings. The connecting plate (2014) is fixedly mounted in the sand conveying hopper (100).

7. An automatic sand-feeding device for fracturing according to claim 6, characterized in that, The passive vibration assembly (203) includes an active adjustment disc (2034), a passive adjustment disc (2032), and a second rotating sleeve (2033). The second rotating sleeve (2033) is rotatably mounted on the active adjustment disc (2034) via a bearing. A plurality of protruding structures (2036) are fixedly connected to one side of the active adjustment disc (2034). A traveling ball (2037) is provided on one side of the passive adjustment disc (2032), and the traveling ball (2037) is in contact with the protruding structure (2036). One end of the elastic spiral blade (204) is fixedly connected to the passive adjustment disc (2032). A first rotating sleeve (2031) is fixedly installed on the passive adjustment disc (2032). The first rotating sleeve (2031) and the second rotating sleeve (2033) are slidably connected to the screw conveyor drive shaft (2012). A spring (2035) is fixedly connected to one side of the first rotating sleeve (2031). One end of the spring (2035) is fixed to the inner ring of the bearing connected to the second rotating sleeve (2033).

8. An automatic sand-feeding device for fracturing according to claim 7, characterized in that, The screw conveyor shaft (2012) has a polygonal shape, and the shapes of the first rotating sleeve (2031) and the second rotating sleeve (2033) are adapted to the shape of the screw conveyor shaft (2012).

9. An automatic sand-feeding device for fracturing according to claim 7, characterized in that, The active adjustment component (202) includes a movable plate (2023), on which an adjusting nut (2022) is fixedly installed. The adjusting nut (2022) is threadedly connected to an adjusting screw (2021), and the two adjusting screws (2021) are rotatably mounted on a drive motor (2011) and another mounting base (2013) respectively through bearings. An operating handle (2024) is fixedly connected to one end of the adjusting screw (2021).

10. An automatic sand-feeding device for fracturing according to claim 9, characterized in that, Three guide rods (2026) are fixedly connected to one side of the movable plate (2023). Two guide rods (2026) are slidably connected to two guide sleeves (2025). Two guide sleeves (2025) and two other guide sleeves (2025) are fixedly connected to the drive motor (2011) and another mounting base (2013). The other two guide rods (2026) slide through the two mounting bases (2013). The three guide rods (2026) pass through the mounting sleeve (2027) and are fixedly connected to the active adjustment disc (2034). The mounting sleeve (2027) is installed on the sand conveying hopper (100).

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