Quartz sand screening device for fracturing

Abstract

The invention relates to the technical field of quartz sand screening, and discloses a fracturing quartz sand screening device which comprises a first fixing frame and a second fixing frame, a screening mechanism is arranged at the top of the second fixing frame, a feeding hopper is installed at the top of the first fixing frame, and a filtering mechanism is arranged in the position, close to the discharging end, of the interior of the feeding hopper. An intermittent feeding mechanism is arranged at the position, close to the feeding end, in the feeding hopper, and a dust removal mechanism is arranged on the outer side of the feeding hopper; the screening mechanism comprises a screening frame, a vibration motor is installed at the bottom of the screening frame, and connecting columns are fixedly connected to the four corners of the top of the second fixing frame. The vibrating motor drives the screen frame to vibrate up and down and swing, quartz sand is screened step by step through the multiple layers of screens, particles with different particle sizes are accurately separated, small particles are discharged from the first-stage discharging port, medium particles are discharged from the second-stage discharging port, large particles are discharged from the third-stage discharging port, and it is guaranteed that the particle sizes of products are uniform; the requirements of different fracturing processes on the particle size of the quartz sand are met.

Description

Technical Field

[0001] The invention relates to the technical field of quartz sand screening, in particular to a quartz sand screening device for fracturing. Background Art

[0002] Quartz sand is a kind of quartz particles made by crushing quartz stone. As an important industrial raw material, quartz sand is widely used in oil fracturing, glass manufacturing, casting and construction. In oil fracturing, quartz sand is often used as a proppant, and its particle size uniformity, purity and grading quality are crucial to the fracturing effect. In order to meet the requirements of different processes for quartz sand particle size, the design and application of screening devices have become a key link in production.

[0003] Existing quartz sand screening devices usually adopt a vibrating screen or a rotary screen structure to classify quartz sand particles through a single vibrating screen.

[0004] The existing quartz sand screening devices lack the ability to accurately screen quartz sand in multiple layers, resulting in inaccurate particle size classification and unable to fully meet the strict requirements of different fracturing processes for quartz sand particle size. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a quartz sand screening device for fracturing, which solves the problem of lack of multi-layer precise screening capability for quartz sand, resulting in inaccurate particle size classification and inability to fully meet the strict requirements of different fracturing processes on quartz sand particle size.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a quartz sand screening device for fracturing, comprising a fixed frame 1 and a fixed frame 2, a screening mechanism is arranged on the top of the fixed frame 2, a feed hopper is installed on the top of the fixed frame 1, a filtering mechanism is arranged inside the feed hopper near the discharge end, an intermittent feeding mechanism is arranged inside the feed hopper near the feed end, and a dust removal mechanism is arranged on the outside of the feed hopper; The screening mechanism includes a screen frame, a vibration motor is installed at the bottom of the screen frame, connecting columns are fixedly connected at the four corners of the top of the fixed frame 2, a spring 1 is arranged between the four connecting columns and the screen frame, a screening net 1 is arranged on the top of the screen frame, a screening net 2 is arranged on the top of the screen frame, a primary discharge port is opened at the bottom of the screen frame, a secondary discharge port is opened at the bottom of the screen frame, a tertiary discharge port is arranged at the bottom of the screen frame, the screening net 1 is located above the primary discharge port, and the secondary discharge port is located above the screening net 2.

[0007] Preferably, the filtering mechanism includes a filter screen, which is slidably connected to the inner wall of the feed hopper, and a motor is installed on both sides of the outside of the feed hopper. The two output ends of the motor are arranged opposite to each other, and the two output ends of the motor are fixedly connected with a cam, and the cam is in contact with the bottom of the filter screen. A reset guide assembly is provided on the top of the filter screen, and the reset guide assembly is used to reset the filter screen when it moves.

[0008] Preferably, the reset guide assembly includes two fixed plates, and the two fixed plates are respectively fixedly connected to the inner sides of the feed hopper, and guide columns are fixedly connected to the top sides of the filter screen. The outer sides of the guide columns are slidingly connected to the internal through holes of the fixed plates, and the outer sides of the guide columns are sleeved with spring 2, and the spring 2 is fixedly connected between the filter screen and the fixed plate.

[0009] Preferably, rubber pads are provided on both sides of the bottom of the filter screen, and the cam is in contact with the bottom of the rubber pads.

[0010] Preferably, the intermittent feeding mechanism includes motor three, and the motor three is installed on the outside of the feed hopper. The output end of the motor three is fixedly connected to a connecting shaft, and the end of the connecting shaft away from the motor three is rotatably connected to the inner wall of the feed hopper, and a plurality of partitions are evenly distributed on the outside of the connecting shaft.

[0011] Preferably, the dust removal mechanism includes an exhaust fan, the input end of the exhaust fan is connected to a dust removal head through a pipe, the dust removal head is fixedly connected to the inner side of the feed hopper, the output end of the exhaust fan is connected to a dust collecting box through a pipe, the inner bottom of the dust collecting box is fixedly connected to a positioning frame, the inner wall of the positioning frame is plugged with a filter plate, the top of the filter plate passes through the top of the dust collecting box and is fixedly connected to a connecting plate, a disassembly assembly is provided on the outer side of the connecting plate, and the disassembly assembly is used for disassembling the filter plate.

[0012] Preferably, the disassembly assembly includes two mounting shells, both mounting shells are fixedly connected to the top of the dust box, the inner walls of the two mounting shells are slidably connected with a movable plate, one end of the movable plate is fixedly connected with a plug post, the plug post is plugged into the groove of the connecting plate, the end of the movable plate away from the plug post is fixedly connected with a connecting rod, a spring three is provided on the outside of the connecting rod, one end of the spring three is fixedly connected to the outer side of the movable plate, and the other end of the spring three is fixedly connected to the inner wall of the mounting shell.

[0013] Preferably, one end of the connecting rod away from the movable plate passes through the inner wall of the mounting shell and extends to the outside and is fixedly connected with a pull plate, and a protective pattern is provided on the outside of the pull plate.

[0014] Preferably, an observation window is provided on the outer side of the dust box, a mounting plate is provided at the bottom of the exhaust fan and the dust box, and the mounting plate is fixedly connected to the outer side of the feed hopper.

[0015] The present invention provides a quartz sand screening device for fracturing, which has the following beneficial effects: 1. The present invention drives the screen frame to achieve up and down vibration and swinging motion through a vibration motor. The quartz sand is screened step by step through the multi-layer screens to accurately separate particles of different particle sizes. Small particles are discharged from the first-level discharge port, medium particles are discharged from the second-level discharge port, and large particles are discharged from the third-level discharge port, ensuring that the product particle size is uniform and meets the requirements of different fracturing processes for the particle size of quartz sand. The combination of vibration and swing improves the screening efficiency, reduces screen blockage, and improves economic benefits.

[0016] 2. The present invention achieves preliminary filtration of quartz sand by vibrating the filter up and down, intercepts large particles and prevents filter clogging, and ensures screening efficiency. The exhaust fan cooperates with the dust collecting box, and the dust removal head efficiently absorbs powder, and collects the dust into the dust collecting box to avoid the dust from spreading into the working environment, ensuring timely dust treatment, optimizing the production environment, and reducing the impact on equipment and personnel. At the same time, the cleanliness and environmental protection performance of the screening operation are improved. The filter plate is designed for easy disassembly and cleaning. The linkage structure of the spring and the plug column can achieve quick installation and fixation. The operation is simple, safe and reliable, which improves the maintenance efficiency and service life of the equipment and ensures that the production process is environmentally friendly, efficient and stable.

[0017] 3. The present invention effectively controls the speed and amount of quartz sand entering the feed hopper through the intermittent feeding mechanism, avoiding overloading or over-fast feeding that causes the screening device to operate overloaded, blocked, or reduce the screening efficiency. At the same time, uniform feeding can improve the screening accuracy and ensure stable screening quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A perspective view of the present invention; Figure 2 is a side view of the present invention; Figure 3 For the present invention Figure 2 A in the enlarged view; Figure 4 It is a schematic diagram of the bottom structure of the present invention; Figure 5 It is a schematic diagram of the structure of the feed hopper of the present invention; Figure 6 For the present invention Figure 5 The enlarged view of point B in the figure; Figure 7 It is a schematic diagram of the structure of the filtering mechanism of the present invention; Figure 8 is a cross-sectional view of a dust collecting box of the present invention; Fig. 9 For the present invention Figure 8 The enlarged view of point C in the figure; Fig.10 It is a schematic diagram of the intermittent feeding mechanism structure of the present invention.

[0019] Among them, 1. Fixed frame 1; 2. Fixed frame 2; 3. Feed hopper; 4. Screening mechanism; 401. Vibration motor; 402. Connecting column; 403. Spring 1; 404. Screen frame; 405. Screening net 1; 406. Screening net 2; 407. Primary discharge port; 408. Secondary discharge port; 409. Thirdary discharge port; 5. Filtering mechanism; 501. Filter; 502. Motor 1; 503. Cam; 504. Guide column; 505. Spring 2; 506. Fixed plate ; 507, rubber pad; 6, dust removal mechanism; 601, mounting plate; 602, exhaust fan; 603, dust removal head; 604, dust collecting box; 605, observation window; 606, filter plate; 607, connecting plate; 608, mounting shell; 609, movable plate; 6010, plug column; 6011, spring three; 6012, connecting rod; 6013, pull plate; 6014, positioning frame; 7, intermittent feeding mechanism; 701, motor three; 702, connecting shaft; 703, partition. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1-Figure 10 The embodiment of the present invention provides a quartz sand screening device for fracturing, including a fixed frame 1 and a fixed frame 2, a screening mechanism 4 is arranged on the top of the fixed frame 2, a feed hopper 3 is installed on the top of the fixed frame 1, a filtering mechanism 5 is arranged inside the feed hopper 3 near the discharge end, an intermittent feeding mechanism 7 is arranged inside the feed hopper 3 near the feed end, and a dust removal mechanism 6 is arranged on the outside of the feed hopper 3.

[0022] Specifically, the fixing frame 1 and the fixing frame 2 2 provide a solid foundation for the overall construction of the device, ensuring the stable operation of each mechanism, reducing the screening error caused by shaking, improving the screening accuracy and product quality consistency, and the stable support structure extends the service life of the equipment. The screening mechanism 4 is for grading quartz sand to meet the requirements of different fracturing processes for the particle size of quartz sand. The feed hopper 3 is for centralized feeding to avoid quartz sand scattering, reduce material waste, improve resource utilization, and reduce production costs. The filtering mechanism 5 is for achieving preliminary filtration of quartz sand, intercepting large particles and preventing the filter 501 from being blocked, thereby ensuring screening efficiency. The intermittent feeding mechanism 7 is for effectively controlling the speed and amount of quartz sand entering the feed hopper 3, avoiding excessive or too fast feeding causing the screening device to be overloaded, blocked, or the screening efficiency to be reduced. The dust removal mechanism 6 is a combination of an exhaust fan 602 and a dust box 604. The dust removal head 603 efficiently absorbs the powder and collects the dust into the dust box 604 to prevent the dust from spreading into the working environment, ensuring that the dust is handled in time, optimizing the production environment, reducing the impact on equipment and personnel, and improving the cleanliness and environmental performance of the screening operation.

[0023] See also Figure 1-Figure 4 The screening mechanism 4 includes a screen frame 404, a vibration motor 401 is installed at the bottom of the screen frame 404, connecting columns 402 are fixedly connected at the four corners of the top of the fixed frame 2, and springs 1 403 are arranged between the four connecting columns 402 and the screen frame 404, a screening net 1 405 is arranged on the top of the screen frame 404, a screening net 2 406 is arranged on the top of the screen frame 404, a primary discharge port 407 is opened at the bottom of the screen frame 404, a secondary discharge port 408 is opened at the bottom of the screen frame 404, and a tertiary discharge port 409 is arranged at the bottom of the screen frame 404, the screening net 1 405 is located above the primary discharge port 407, and the secondary discharge port 408 is located above the screening net 2 406.

[0024] Specifically, through the vibration motor 401, in cooperation with the spring 1 403 and the connecting column 402, the vibration motor 401 generates a vibration force, causing the screen frame 404 to vibrate up and down and sway to a certain extent, thereby achieving efficient screening of quartz sand, preventing the screen from being blocked, and improving the screening efficiency and accuracy; through the screening net 1 405 and the screening net 2 406, the quartz sand is classified according to the particle size, and the particles smaller than the mesh of the screening net 1 405 are discharged from the first discharge port 407, the particles between the mesh sizes of the two are discharged from the second discharge port 408, and the particles larger than the mesh size of the screening net 2 406 are discharged from the third discharge port 409, thereby achieving accurate particle size classification, meeting different usage requirements, and improving product quality.

[0025] See also Figure 5-Figure 7The filtering mechanism 5 includes a filter screen 501, which is slidably connected to the inner wall of the feed hopper 3. Motors 1 502 are installed on both sides of the outside of the feed hopper 3. The output ends of the two motors 1 502 are arranged relatively to each other. The output ends of the two motors 1 502 are fixedly connected with cams 503. The cams 503 are in contact with the bottom of the filter screen 501. A reset guide assembly is provided on the top of the filter screen 501. The reset guide assembly is used to reset the filter screen 501 when it moves. The reset guide assembly includes two fixed plates 506, which are respectively fixedly connected to the inner sides of the feed hopper 3. Guide columns 504 are fixedly connected to both sides of the top of the filter screen 501. The outer side of the guide column 504 is slidably connected to the internal through hole of the fixed plate 506. The outer side of the guide column 504 is sleeved with a spring 2 505, and the spring 2 505 is fixedly connected between the filter screen 501 and the fixed plate 506.

[0026] Specifically, through the filter screen 501, in cooperation with the cam 503, the motor 1 502 drives the cam 503 to rotate and lift up and lower the filter screen 501, thereby achieving preliminary filtration of the quartz sand, intercepting larger particles above the filter screen 501, preventing them from entering the subsequent screening mechanism 4 to cause blockage and damage, and ensuring the stable operation of the equipment; through the cooperation of the filter screen 501 and the spring 2 505, when the cam 503 lifts the filter screen 501, the spring 2 505 is compressed, and when the cam 503 no longer acts, the spring 2 505 rebounds to reset the filter screen 501, thereby achieving the filter screen 501 The filter 501 can work continuously and stably, avoiding the filtering effect being affected by the inability to reset the filter 501, thereby ensuring the continuity and stability of the filtering; through the cooperation between the filter 501 and the guide column 504, the guide column 504 slides in the through hole of the fixed plate 506 when the filter 501 moves up and down, thereby realizing the control of the moving direction of the filter 501, ensuring the vertical and stable movement of the filter 501, improving the accuracy and reliability of the filtering, making the filtering process more efficient and accurate, reducing the loss and waste of quartz sand in the filtering link, and improving the working efficiency and product quality of the entire screening device.

[0027] See also Figure 5-Figure 6 Rubber pads 507 are provided on both sides of the bottom of the filter screen 501 , and the cam 503 is in contact with the bottom of the rubber pads 507 .

[0028] Specifically, the rubber pad 507 cooperates with the cam 503, and the cam 503 squeezes the rubber pad 507 when it rotates. Since the rubber pad 507 is elastic, it will produce a buffering effect during the squeezing process, thereby reducing the hard collision between the cam 503 and the filter 501, reducing the wear of the cam 503 and the filter 501, and extending the service life of the two. At the same time, it can also reduce the noise generated by the collision and optimize the working environment.

[0029] See also Figure 5 and Fig.10The intermittent feeding mechanism 7 includes a motor 3 701, which is installed on the outside of the feed hopper 3. The output end of the motor 3 701 is fixedly connected to a connecting shaft 702, and the end of the connecting shaft 702 away from the motor 3 701 is rotatably connected to the inner wall of the feed hopper 3. A plurality of partitions 703 are evenly distributed on the outside of the connecting shaft 702.

[0030] Specifically, through the motor 3 701, in cooperation with the connecting shaft 702 and the partition 703, the motor 3 701 rotates to drive the connecting shaft 702 to rotate, and then the partitions 703 equidistantly distributed on the outside of the connecting shaft 702 rotate accordingly, realizing intermittent control of the quartz sand feeding, avoiding excessive or too fast feeding. On the one hand, it prevents the screening mechanism 4 from being unable to process the material in time due to the feeding speed being too fast, thus causing blockage, and ensures the smoothness of the screening process; on the other hand, the stable intermittent feeding ensures that the quartz sand can be evenly distributed in the screening mechanism 4, improves the screening accuracy, makes the product particle size more in line with the requirements, and improves the overall screening quality and production efficiency.

[0031] See also Figure 2 , Figure 3 , Figure 5 and Figure 8 The dust removal mechanism 6 includes an exhaust fan 602, the input end of the exhaust fan 602 is connected to a dust removal head 603 through a pipeline, the dust removal head 603 is fixedly connected to the inner side of the feed hopper 3, the output end of the exhaust fan 602 is connected to a dust collecting box 604 through a pipeline, the inner bottom of the dust collecting box 604 is fixedly connected to a positioning frame 6014, the inner wall of the positioning frame 6014 is plugged with a filter plate 606, the top of the filter plate 606 passes through the top of the dust collecting box 604 and is fixedly connected to a connecting plate 607.

[0032] Specifically, through the cooperation of the exhaust fan 602 and the dust removal head 603, the exhaust fan 602 generates suction when in operation, and the dust removal head 603 sucks in the dust raised in the feed hopper 3, thereby realizing effective collection of dust, reducing dust pollution in the working area, and protecting the health of the operator; through the cooperation of the exhaust fan 602 and the dust collecting box 604, the dust-laden airflow is transported to the dust collecting box 604 by the exhaust fan 602, thereby realizing centralized storage of dust, avoiding dust from floating around and causing pollution in a larger area, and facilitating subsequent unified treatment; through the cooperation of the dust collecting box 604 and the filter plate 606, when the dust-laden gas passes through the dust collecting box 604, the dust is intercepted by the filter plate 606, and the air is discharged, thereby realizing the separation of dust and air, ensuring that the discharged gas is relatively clean, reducing pollution to the environment, and also preventing dust from accumulating inside the equipment, reducing damage to the equipment caused by dust.

[0033] See also Figure 8-Figure 9A disassembly assembly is provided on the outer side of the connecting plate 607, and the disassembly assembly is used to disassemble the filter plate 606. The disassembly assembly includes two mounting shells 608, and the two mounting shells 608 are fixedly connected to the top of the dust collecting box 604. The inner walls of the two mounting shells 608 are slidably connected with a movable plate 609, and one end of the movable plate 609 is fixedly connected with a plug post 6010, and the plug post 6010 is plugged into the groove of the connecting plate 607. The end of the movable plate 609 away from the plug post 6010 is fixedly connected with a connecting rod 6012, and a spring three 6011 is provided on the outer side of the connecting rod 6012, and one end of the spring three 6011 is fixedly connected to the outer side of the movable plate 609, and the other end of the spring three 6011 is fixedly connected to the inner wall of the mounting shell 608.

[0034] Specifically, by installing the shell 608, in cooperation with the movable plate 609, the movable plate 609 slides on the inner wall of the installing shell 608, providing a track for the stable movement of the plug post 6010; by the movable plate 609, in cooperation with the plug post 6010, when the movable plate 609 moves, the plug post 6010 moves accordingly, so that it can be tightly plugged into or separated from the groove of the connecting plate 607, thereby achieving a stable fixation and quick disassembly of the filter plate 606, ensuring that the filter plate 606 does not loosen during operation and can be easily removed when it needs to be cleaned or replaced. ; Through the movable plate 609, in cooperation with spring three 6011, the movable plate 609 is pulled to compress spring three 6011. After releasing the hand, spring three 6011 rebounds and pushes the movable plate 609 back to its original position, realizing the function of automatic resetting of the plug post 6010 into the groove. The operation is convenient and efficient, which improves the loading and unloading efficiency of the filter plate 606 and reduces the downtime of equipment. At the same time, it ensures the stability of the filter plate 606 after installation, ensures the stable operation of the dust removal mechanism 6, maintains a good dust removal effect, and reduces the impact of dust on equipment and the environment.

[0035] See also Figure 8-Figure 9 One end of the connecting rod 6012 away from the movable plate 609 passes through the inner wall of the mounting shell 608 and extends to the outside and is fixedly connected to the pull plate 6013, and the outside of the pull plate 6013 is provided with a protective pattern.

[0036] Specifically, when the pull plate 6013 is pulled, the movable plate 609 is driven to slide via the connecting rod 6012, so that the operation of plugging and unplugging the internal plug post 6010 can be easily controlled from the outside of the dust box 604. Through the pull plate 6013, in coordination with the protective pattern, when the operator pulls the pull plate 6013, the protective pattern will increase the friction between the hand and the pull plate 6013, so that the hand can grasp the pull plate 6013 more steadily, achieving a reliable holding effect, avoiding the pull plate 6013 from slipping during operation, and ensuring the smooth disassembly and installation process of the filter plate 606.

[0037] See also Figure 2-Figure 3An observation window 605 is provided on the outer side of the dust box 604 , and a mounting plate 601 is provided at the bottom of the exhaust fan 602 and the dust box 604 , and the mounting plate 601 is fixedly connected to the outer side of the feed hopper 3 .

[0038] Specifically, through the observation window 605, in cooperation with the dust box 604, the operator can intuitively view the dust accumulation inside the dust box 604 through the observation window 605 without opening the dust box 604, thereby realizing real-time monitoring of the dust status and being able to promptly understand whether the dust needs to be cleaned, thereby reasonably arranging the cleaning and maintenance work, improving the stability and sustainability of equipment operation, and reducing the occurrence of dust removal effects being affected by excessive dust accumulation; through the mounting plate 601, in cooperation with the exhaust fan 602 and the dust box 604, the mounting plate 601 firmly fixes the exhaust fan 602 and the dust box 604 to the outside of the feed hopper 3, thereby realizing stable installation support.

[0039] Working principle: First, put the quartz sand with screening into the feed hopper 3, and the intermittent feeding mechanism 7 starts to work. The motor 3 701 drives the connecting shaft 702 to rotate, and the partition 703 on the connecting shaft 702 rotates to intermittently feed the quartz sand into the feed hopper 3, controlling the speed and amount of the quartz sand entering to avoid excessive or too fast feeding affecting subsequent screening and other links.

[0040] Then, the quartz sand entering the feed hopper 3 with screening is preliminarily filtered at the filtering mechanism 5, and the motor 502 is started, which drives the cam 503 to rotate, and the cam 503 repeatedly lifts and lowers the filter 501, and the filter 501 moves up and down under the action of the spring 2 505 and the guide column 504, and the larger particles are intercepted above the filter 501, and the smaller particles pass through the filter 501 and enter the bottom. At the same time, the vibration of the filter 501 can prevent the particles from clogging the filter 501, thereby ensuring that the quartz sand can smoothly enter the screening mechanism 4.

[0041] Secondly, when the sieved quartz sand is put into the feed hopper 3, the exhaust fan 602 is started at the same time. The exhaust fan 602 works, sucks the powder raised in the feed hopper 3 through the dust removal head 603, and sends it to the dust box 604 through the pipeline. The powder is intercepted when passing through the filter plate 606 in the dust box 604, and the air is discharged through the external pipeline. When the filter plate 606 needs to be replaced or cleaned, the connecting rod 6012 will be driven to move by pulling the pull plate 6013, and the movement of the connecting rod 6012 will cause the movable plate 609 to move accordingly. Because the movable plate 609 and the plug 6010 are fixed, the plug 6010 will be pulled out of the groove of the connecting plate 607. At the same time, the spring three 6011 is compressed, the elastic potential energy increases, and the protective pattern on the pull plate 6013 allows the operator to better hold the pull plate 6013 for pulling operation, which is convenient for removing the plug 6010 from the groove, so that the filter plate 606 can be removed for cleaning or replacement. When the filter plate 606 needs to be reinstalled, repeat the above steps of pulling the pull plate 6013, and then insert it from the top of the dust box 604 to the inner wall of the positioning frame 6014, so that the groove of the connecting plate 607 is aligned with the plug 6010. By pulling the pull plate 6013, the elastic performance of the spring three 6011 is released, so that the movable plate 609 moves toward the direction of the connecting plate 607, and the plug 6010 is inserted into the groove of the connecting plate 607, thereby fixing the filter plate 606.

[0042] Finally, the filtered quartz sand enters the screening mechanism 4 from the discharge port of the feed hopper 3, and the vibration motor 401 is started. The vibration motor 401 is started to vibrate the screen frame 404, and the screen frame 404 is connected to the connecting column 402 through the spring 1 403, and generates up and down vibration and a certain degree of swinging motion during the vibration process. The quartz sand first falls on the screening net 1 405, and the quartz sand smaller than the mesh size of the screening net 1 405 falls through the mesh and is discharged from the first discharge port 407; the larger particles remaining on the screening net 1 405 continue to be vibrated and swung, among which the particles smaller than the mesh size of the screening net 2 406 fall through the screening net 2 406 and are discharged from the second discharge port 408; finally, the largest particles remaining on the screening net 2 406 are discharged from the third discharge port 409, realizing the graded screening of the quartz sand.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A quartz sand screening device for fracturing, comprising a fixing frame 1 (1) and a fixing frame 2 (2), characterized in that: A screening mechanism (4) is arranged on the top of the second fixed frame (2), a feed hopper (3) is installed on the top of the first fixed frame (1), a filtering mechanism (5) is arranged inside the feed hopper (3) near the discharge end, an intermittent feeding mechanism (7) is arranged inside the feed hopper (3) near the feed end, and a dust removal mechanism (6) is arranged outside the feed hopper (3); The screening mechanism (4) comprises a screening frame (404), a vibration motor (401) is installed at the bottom of the screening frame (404), connecting columns (402) are fixedly connected at the four corners of the top of the second fixing frame (2), and springs (403) are arranged between the four connecting columns (402) and the screening frame (404), a screening net (405) is arranged at the top of the screening frame (404), a screening net (406) is arranged at the top of the screening frame (404), a primary discharge port (407) is provided at the bottom of the screening frame (404), a secondary discharge port (408) is provided at the bottom of the screening frame (404), and a tertiary discharge port (409) is provided at the bottom of the screening frame (404), the screening net (405) is located above the primary discharge port (407), and the secondary discharge port (408) is located above the screening net (406).

2. A quartz sand screening device for fracturing according to claim 1, characterized in that: The filtering mechanism (5) comprises a filter screen (501), the filter screen (501) being slidably connected to the inner wall of the feed hopper (3), a motor 1 (502) being installed on both sides of the outside of the feed hopper (3), the output ends of the two motors 1 (502) being arranged opposite to each other, the output ends of the two motors 1 (502) being fixedly connected to a cam (503), the cam (503) being in contact with the bottom of the filter screen (501), and a reset guide assembly being arranged on the top of the filter screen (501), the reset guide assembly being used for resetting the filter screen (501) when it moves.

3. A quartz sand screening device for fracturing according to claim 2, characterized in that: The reset guide assembly comprises two fixed plates (506), the two fixed plates (506) are respectively fixedly connected to the inner sides of the feed hopper (3), the top sides of the filter screen (501) are fixedly connected with guide columns (504), the outer sides of the guide columns (504) are slidably connected to the inner through holes of the fixed plates (506), the outer sides of the guide columns (504) are sleeved with spring 2 (505), and the spring 2 (505) is fixedly connected between the filter screen (501) and the fixed plates (506).

4. A quartz sand screening device for fracturing according to claim 2, characterized in that: Rubber pads (507) are provided on both sides of the bottom of the filter screen (501), and the cam (503) is in contact with the bottom of the rubber pads (507).

5. The quartz sand screening device for fracturing according to claim 1, characterized in that: The intermittent feeding mechanism (7) comprises a motor three (701), wherein the motor three (701) is mounted on the outside of the feed hopper (3), and the output end of the motor three (701) is fixedly connected to a connecting shaft (702), and one end of the connecting shaft (702) away from the motor three (701) is rotatably connected to the inner wall of the feed hopper (3), and a plurality of partitions (703) are evenly distributed on the outside of the connecting shaft (702).

6. The quartz sand screening device for fracturing according to claim 1, characterized in that: The dust removal mechanism (6) comprises an exhaust fan (602), the input end of the exhaust fan (602) being connected to a dust removal head (603) via a pipeline, the dust removal head (603) being fixedly connected to the inner side of the feed hopper (3), the output end of the exhaust fan (602) being connected to a dust collection box (604) via a pipeline, the inner bottom of the dust collection box (604) being fixedly connected to a positioning frame (6014), the inner wall of the positioning frame (6014) being plugged with a filter plate (606), the top of the filter plate (606) penetrating the top of the dust collection box (604) being fixedly connected to a connecting plate (607), the outer side of the connecting plate (607) being provided with a disassembly component, the disassembly component being used for disassembling the filter plate (606).

7. A quartz sand screening device for fracturing according to claim 6, characterized in that: The disassembly assembly comprises two mounting shells (608), both mounting shells (608) are fixedly connected to the top of the dust box (604), the inner walls of the two mounting shells (608) are slidably connected with movable plates (609), one end of the movable plate (609) is fixedly connected with a plug post (6010), the plug post (6010) is plugged into a groove of the connecting plate (607), one end of the movable plate (609) away from the plug post (6010) is fixedly connected with a connecting rod (6012), the outer part of the connecting rod (6012) is provided with a spring three (6011), one end of the spring three (6011) is fixedly connected to the outer side of the movable plate (609), and the other end of the spring three (6011) is fixedly connected to the inner wall of the mounting shell (608).

8. A quartz sand screening device for fracturing according to claim 7, characterized in that: One end of the connecting rod (6012) away from the movable plate (609) passes through the inner wall of the mounting shell (608) and extends to the outside and is fixedly connected to a pull plate (6013), and a protective pattern is provided on the outside of the pull plate (6013).

9. A quartz sand screening device for fracturing according to claim 6, characterized in that: An observation window (605) is provided on the outside of the dust collecting box (604), and a mounting plate (601) is provided at the bottom of the exhaust fan (602) and the dust collecting box (604), wherein the mounting plate (601) is fixedly connected to the outside of the feed hopper (3).

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