A multi-stage screening device for an integrated sand making plant

Abstract

This invention relates to a multi-stage screening device for an integrated sand making plant, comprising a screen box with multiple screen frames arranged side by side from top to bottom inside. Screens are movably connected to the inner sides of the screen frames. Furthermore, multiple follower mechanisms are arranged equidistantly on the front and rear sides of each screen frame. Each follower mechanism includes two centrally symmetrical base plates with through-grooves I. A through-groove is provided on the screen frame corresponding to the through-groove I. Simultaneously, multiple vibrating screen frames are arranged below the screens. The front and rear ends of each vibrating screen frame are respectively connected to the corresponding through-groove and through-groove I. Moreover, a follower rod is fixedly connected to each base plate. A follower mechanism including a follower rod is arranged between the two base plates. The follower rod, the end of the vibrating screen frame, and the follower rod are on the same vertical plane. Therefore, during the rotation of the follower rod, it can abut against the vibrating screen frame and the follower rod, thereby realizing the left-right and up-down movement of the screen. Compared with existing technology, this effectively absorbs noise and reduces the overall vibration of the sand making plant.

Description

Technical Field

[0001] This invention relates to the technical field of integrated sand making tower screening mechanisms, and more particularly to a multi-stage screening device for integrated sand making towers. Background Technology

[0002] Sand and gravel are among the most important raw materials for infrastructure construction in my country, and the replacement of natural sand with manufactured sand has become an inevitable trend in the industry. Manufactured sand is rock particles with a nominal particle size of less than 5mm, produced by removing soil from rocks, mechanically crushing them, and screening them.

[0003] Traditional crushing, screening, and transportation systems mostly employ a planar, unfolded operation method, using numerous belt conveyors of varying lengths to connect and reconnect the entire system. However, this planar operation method requires all equipment to be installed on the same plane, which necessitates a large footprint. Some technologies utilize vertical, building-style sand-making structures to improve space utilization.

[0004] However, in order to fully utilize gravitational potential energy, reduce energy loss during sand and gravel transportation, and ensure that sand and gravel of different grades after screening are correctly distributed to appropriate processing positions, vertical building-type sand and gravel facilities generally have corresponding multi-stage screening devices installed on the top of the vertical building. Existing technology uses a bucket elevator to transport crushed sand and gravel to the top of the sand and gravel building, tilting towards the inlet of the screening device. Then, after multi-stage screening, the sand and gravel are divided into different grades according to particle size before being transported to the next processing step for mixing or re-crushing.

[0005] Existing multi-stage screening devices mostly employ vibrating screens, a common type of screening equipment. These typically include a screen box and screen meshes arranged equidistantly from top to bottom inside the box. A hopper is located on one side of the screen box, and the screen meshes are arranged at an angle so that the gravitational potential energy of the sand and gravel can be used to move them into the material during screen vibration. Specifically, existing devices generally have a support frame installed below the screen box, with a compression spring connecting the support frame to the screen box. A large vibrating motor is usually installed at the bottom of the screen box, and the eccentric rotation of a counterweight on the motor drives the entire screen box to vibrate.

[0006] In actual use, we found that because the existing technology device needs to drive the screen box to move as a whole, it has high power requirements for the vibration motor and relatively high structural strength requirements for the screen box. At the same time, because the screen box vibrates continuously relative to the support and the sand making tower, the screen box will also exert continuous vibration impact on the sand making tower. This will not only damage the structural strength of the sand making tower, but also generate a lot of noise.

[0007] Therefore, we believe that a low-energy multi-stage screening device is needed that can reduce the impact on the sand making tower structure and reduce noise. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this invention proposes an integrated multi-stage screening device for sand making plants, which has the advantages of low energy consumption and avoidance of vibration and impact on the sand making plant. It solves the problems of existing devices, which have large self-weight of screening devices, high requirements for the corresponding drive mechanism, and large vibration and impact on the sand making plant during vibration.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] An integrated sand making tower multi-stage screening device includes a screen box composed of a front wall panel and a rear wall panel, which are fixedly connected by a connecting rod. Multiple screens are arranged equidistantly from top to bottom between the front and rear wall panels. The device also includes multiple screen frames arranged equidistantly from top to bottom, each screen frame corresponding to one of the screens. Each screen frame has multiple connecting mechanisms I arranged equidistantly from front to back on its left and right sides. The screen frame is slidably connected to the screen box via the connecting mechanisms I. Each screen is located inside its corresponding screen frame. Furthermore, each screen has multiple connecting mechanisms I arranged equidistantly from front to back on its front and rear sides. Multiple connecting mechanisms II are movably connected side-by-side from left to right on each side. The screen is elastically connected to the screen frame through the connecting mechanisms II. Multiple follower mechanisms are arranged side-by-side from left to right on both the front and rear sides of each screen frame. Each follower mechanism includes two base plates with an L-shaped vertical projection. The two base plates are centrally symmetrical. A follower mechanism including a follower rod is provided between the two base plates. Each follower mechanism has a follower rod on its upper and lower sides with a front-to-back axial follower rod. The two follower rods are fixedly connected to the horizontal sections of the two base plates. Furthermore, each base plate has a through-hole opening. Each screen frame has multiple through slots extending from left to right through the slide groove I. Furthermore, multiple vibrating screen frames are arranged side-by-side from left to right on the lower side of each screen, with each vibrating screen frame corresponding to one of the through slots. The front and rear ends of each vibrating screen frame are respectively penetrated by the corresponding through slot and slide groove I. The front and rear ends of each vibrating screen frame, as well as each follower rod and its corresponding driven rod, are located in the same vertical plane. The central axis of each driven rod is perpendicular to the central axis of the follower rod. Within the multiple driven mechanisms corresponding to a single screen frame in the same vertical plane, the central axes of two adjacent driven rods are... The lines are perpendicular to each other. Each driven mechanism includes a positioning tube fixedly connected to the outer end face of the screen box. A driven tube is sleeved on the outside of the positioning tube. The driven tube is rotatably connected to the positioning tube. A transmission rod is coaxially fixedly connected to the inner side of the driven tube. A rectangular array of through holes is opened through the screen box. Each through hole corresponds to a transmission rod. Each transmission rod extends through the through hole into the screen box. The end of each transmission rod away from the driven tube is fixedly connected to the driven rod. During the rotation of the driven rod, the driven rod and the follower rod abut against each other, forcing the follower rod to drive the screen frame to make left and right linear movements.

[0011] Preferably, the line connecting the two follower rods in each follower mechanism is perpendicular to the length side of the corresponding screen frame, and the line connecting the two vibrating screen frames in each follower mechanism is parallel to the length side of the corresponding screen frame.

[0012] Preferably, a support plate is provided between the two base plates in each of the follower mechanisms. A positioning shaft is fixedly connected to the lower end of the support plate. The positioning shaft is slidably connected to the vibrating screen frame. A compression spring I is sleeved on the outside of the positioning shaft. The two axial ends of the compression spring I abut against the support plate and the vibrating screen frame, respectively. The portion of each support plate and the corresponding vibrating screen frame protruding from the base plate is on the same vertical plane. Furthermore, when the compression spring I is not affected by external force, the midpoint of the line connecting the two follower rods in a single follower mechanism coincides with the midpoint of the line connecting the two vibrating screen frames in a single follower mechanism.

[0013] Preferably, a drive mechanism is provided among the multiple driven tubes corresponding to each screen frame. The drive mechanism includes a drive motor fixedly connected to the outer end face of the screen box, and a drive wheel is fixedly connected to the output shaft of each drive motor.

[0014] Preferably, the drive motor further includes a transmission belt, each transmission belt being sleeved on the outer side of the driven tube and the drive wheel corresponding to a single screen frame, and a limit wheel being abutted on the lower side of each transmission belt. The limit wheel is rotatably connected to the screen box, and the transmission belt is interference-fitted with the drive wheel and the driven tube through the limit wheel.

[0015] Preferably, each of the connecting mechanisms I includes a positioning rod for fixed connection with the screen box, a compression spring II sleeved on the outside of the positioning rod, and a positioning nut screwed to the end of each positioning rod away from the corresponding screen frame. Each screen frame has multiple positioning holes running parallel from front to back on both its left and right sides, with each positioning hole corresponding to a positioning rod. Each positioning rod is inserted into a positioning hole, and the two axial ends of each compression spring II abut against the screen box and the positioning nut, respectively.

[0016] Preferably, each of the connecting mechanisms II includes a movable rod with a through groove II, and a limiting rod is inserted into each groove II. The limiting rod is fixedly connected to the adjacent follower mechanism. A limiting nut is screwed to the end of each movable rod away from the vibrating screen frame. A compression spring III is sleeved on the outside of each movable rod, and the two axial ends of the compression spring III abut against the follower mechanism and the limiting nut, respectively.

[0017] Preferably, each of the vibrating screen frames has multiple notches and grooves equidistantly spaced from left to right on its upper front and rear sides. Each notch and groove corresponds to a multiple movable rod. Furthermore, each movable rod is movably connected to the screen via a connecting mechanism III on the side closest to the screen. Each movable rod protrudes into the screen box through the notch and groove. When the lower end face of the movable rod abuts against the lower end of the notch and groove, the central axis of the limiting nut is perpendicular to the vertical plane.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] In practical use, this invention utilizes a driven rod in conjunction with a follower rod to enable the screen frame to continuously reciprocate linearly under the drive of the driven mechanism. This leverages the gravitational potential energy of the material being screened to achieve separation between the material and the screen, preventing material buildup and clogging of the screen openings. It also allows the material to spread evenly on the screen, increasing the contact area and ensuring screening efficiency. Furthermore, it allows larger particles to continuously move above the screen to reach their intended position, fulfilling the transfer requirements. Moreover, by utilizing the frictional resistance between the material and the screen and constraining the screen's own speed, combined with high screening efficiency, smaller particles are ensured to be screened at their intended position, preventing them from mixing with larger particles and being transferred to the intended location.

[0020] This invention, by setting a vibrating screen frame below the screen and constraining the end of the vibrating screen frame and the driven rod to be in the same vertical plane, can utilize the gravitational potential energy of the screen itself. After the driven rod removes its support force on the vibrating screen frame, that is, after the upward support force on the screen is removed, the screen can fall quickly. This utilizes the motion separation between the screen and the material to be screened, allowing the material to impact the screen holes, thereby quickly completing the screening process and improving screening efficiency.

[0021] This invention, by setting a driven rod, a follower rod, and a vibrating screen frame, can fully complete the screening process. Compared with the prior art where the entire screen box vibrates to complete the screening, this method not only has a higher vibration frequency of the screen, which is more in line with the screening requirements for small-diameter materials, but also allows the driven rod to rotate using a low-power drive mechanism, which can effectively reduce the requirements for equipment and energy. At the same time, since the screen does not participate in the vibration process, it can also effectively reduce the quality requirements of the overall equipment. Furthermore, this method can effectively reduce the vibration impact on the overall sand making tower steel structure caused by the screen box vibration during the overall production process, thereby effectively improving the noise problem. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 This is a schematic diagram of the overall structure of the sieve box of the present invention.

[0024] Figure 3 This is a schematic diagram showing the connection between the screen and the screen frame of the present invention.

[0025] Figure 4 This is a schematic diagram showing the positional relationship between the screen box and the vibrating screen frame of the present invention.

[0026] Figure 5 This is a schematic diagram showing the connection between the follower mechanism and the limit rod of the present invention.

[0027] Figure 6This is a schematic diagram showing the positional relationship between the transmission mechanism and the follower mechanism of the present invention.

[0028] Figure 7 This is a schematic diagram showing the cooperation relationship between the positioning tube and the driven tube of the present invention.

[0029] Figure 8 This is a schematic diagram of the overall structure of the drive mechanism of the present invention.

[0030] Figure 9 This is a schematic diagram showing the positional relationship between the support plate and the compression spring I of the present invention.

[0031] Figure 10 This is a schematic diagram of the overall structure of the connecting mechanism I of the present invention.

[0032] Figure 11 This is a schematic diagram showing the cooperation relationship between connecting mechanism II and connecting mechanism III of the present invention.

[0033] In the diagram: 1. Screen box; 101. Rear wall panel; 102. Front wall panel; 103. Connecting rod; 2. Drive mechanism; 201. Drive motor; 202. Drive wheel; 203. Transmission belt; 204. Limiting wheel; 3. Screen frame; 4. Screen; 5. Driven mechanism; 501. Driven rod; 502. Transmission rod; 503. Positioning tube; 504. Driven tube; 6. Connecting mechanism III; 7. Connecting mechanism II; 701. Movable rod; 702. Compression spring III; 703, Limiting nut; 704, Slide groove II; 8, Support plate; 9, Vibration mesh frame; 10, Notch groove; 11, Through groove; 12, Follower mechanism; 1201, Base plate; 1202, Slide groove I; 1203, Follower rod; 13, Positioning hole; 14, Positioning shaft; 15, Compression spring I; 16, Connecting mechanism I; 1601, Positioning nut; 1602, Compression spring II; 1603, Positioning rod; 17, Limiting rod. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0036] Please refer to Figure 1-11 An integrated sand making tower multi-stage screening device, which is consistent with the existing vibrating screen structure, includes a screen box 1 composed of a front wall plate 102 and a rear wall plate 101, and the front wall plate 102 and the rear wall plate 101 are fixedly connected by a connecting rod 103.

[0037] It should be noted that, as Figure 2 As shown, the connecting rod 103 has two forms. One is a polygonal structure, which is mainly used to connect the front wall panel 102 and the rear wall panel 101. The other is a cylindrical structure, which protrudes from the screen box 1. In addition to connecting the front wall panel 102 and the rear wall panel 101, the part protruding from the screen box 1 can also serve as a fixing point for this device, so as to connect the screen box 1 to the existing steel structure frame of the sand making building and fix the screen box 1.

[0038] At the same time, such as Figure 1 As shown, inside the screen box 1, multiple screens 4 are arranged in parallel at equal intervals from top to bottom. Each screen has a different screening grade, that is, the screen hole diameter of the multiple screens 4 gradually decreases from top to bottom. At the same time, each screen 4 is constrained to be in an inclined state. This allows the existing technology device to utilize the gravitational potential energy of the screened material itself during the vibration of the screen 4, and to achieve the rolling of the screened material in conjunction with the inclined surface, thereby improving the screening efficiency. It also allows the screened material with a larger particle size that cannot enter the area below the screen 4 to move to a specific position on the screen 4 according to its own gravitational potential energy and be received by the hopper located on one side of the screen 4, and then transferred to the next processing step.

[0039] Therefore, this device constrains the height of the left side of each screen 4 to be greater than the height of the right side, and the corresponding hopper is set on the right side of the screen box 1. This allows the material to be screened to move from the left side of the screen 4 to the right side and enter the hopper.

[0040] Unlike existing technology devices, such as Figure 1 , Figure 3 , Figure 4 As shown, this device has multiple vibrating screen frames 9 arranged side by side from left to right below each screen 4. The vibrating screen frames 9 move up and down to strike the screen 4. By utilizing the motion separation between the screen 4 and the material being screened during the up and down movement of the screen 4, and in conjunction with the inertia of the material itself, the material being screened can re-impact the screen 4 during the striking process, thereby realizing the screening process of the screen 4 on the material being screened.

[0041] Meanwhile, this device has multiple screen frames 3 arranged side by side at equal intervals from top to bottom inside the screen box 1, constraining multiple screen frames 3 to correspond one-to-one with multiple screens 4, and the screens 4 are located inside the screen frames 3. The screens 4 are elastically connected to the screen frames 3 through the connecting mechanism II 7, so that the screens 4 can move upward relative to the screen frames 3 to achieve the separation of movement between the screens 4 and the screened material.

[0042] Furthermore, this device has multiple connecting mechanisms I16 arranged side by side from front to back on both sides of each screen frame 3. Each screen frame 3 is slidably connected to the screen box 1 through the connecting mechanism I16. This allows the screen frame 3 to move linearly left and right relative to the screen box 1. By moving the screen frame 3 left and right, the position of the material to be screened is changed. Combined with the gravitational potential energy of the material itself, the material can be moved to the right side of the screen 4. At the same time, this continuous reciprocating linear motion of the screen frame 3 can further enhance the separation of the material from the screen box 1. Utilizing the inertia of the material itself, the material is evenly spread on the upper side of the screen 4, thereby accelerating the screening efficiency when the material impacts the screen 4 from above and preventing excessive accumulation of material in a certain position on the screen 4, which would block the screen holes.

[0043] Specifically, such as Figure 1 , Figure 3 , Figure 10 As shown, the connecting mechanism I16 includes a fixing rod for fixed connection with the screen box 1. Each screen frame 3 has a positioning hole 13 through which the fixing rod passes on both the left and right sides. Each fixing rod is inserted into the corresponding positioning hole 13. This utilizes the constraint effect of the positioning hole 13 on the positioning rod 1603 so that the screen frame 3 can only move in a straight line left and right relative to the screen box 1.

[0044] Meanwhile, a positioning nut 1601 is screwed onto the end of the fixed rod away from the screen frame 3. Furthermore, a compression spring II 1602 is sleeved on the outside of the fixed rod. By constraining the two axial ends of the compression spring II 1602 to abut against the positioning nut 1601 and the screen frame 3 respectively, the compression spring II 1602 can be used to quickly reset the screen frame 3, thereby separating the screen 4 from the material being screened during left and right movements.

[0045] In practice, when the screen frame 3 is initially pushed to the left, it moves to the left. At this time, the compression spring II 1602 on the left side is compressed. When the pushing force on the screen frame 3 is removed, the compression spring II 1602 releases its stored elastic potential energy, and the screen frame 3 can quickly return to its original position to the right. Correspondingly, when the screen frame 3 is initially pushed to the right, it can quickly return to its original position to the left.

[0046] It should be noted that since the screen frame 3 of this device can be pushed to the left and to the right, and the movement of the screen frame 3 when it is actively pushed cannot be very fast, when the screen frame 3 is actively pushed, the screened material on the upper side of the screen 4 will be affected by frictional resistance and move synchronously with the screen 4. Therefore, this can curb the falling range of screened material with a particle size smaller than the screen hole on the upper side of the screen 4, so that it is enriched on the left side of the screen 4. Only a portion of the screened material with a particle size larger than the screen hole remains on the upper side of the screen 4, and it continues to move to the right and is thus enriched on the right side of the screen 4.

[0047] It should be noted that, due to the presence of compression spring II 1602, when the screen frame 3 is reset to near its initial position, the compression springs II 1602 on both sides will continuously act on the side of the screen frame 3. This allows the screen frame 3 to continuously and frequently perform reciprocating linear motion in this state, thereby further preventing the screened material from clogging the screen holes and accelerating the screening efficiency.

[0048] Specifically, such as Figure 3 , Figure 11 As shown, the connecting mechanism II7 includes a movable rod 701. The end of the movable rod 701 near the screen 4 is movably connected to the screen 4 through the connecting mechanism III6. Furthermore, the screen frame 3 has a notch 10 through which the movable rod 701 passes, and the movable rod 701 is located in the notch 10.

[0049] At this time, by opening a sliding groove II 704 through the movable rod 701, and inserting a limiting rod 17 into the sliding groove II 704, the purpose of the screen 4 moving up and down can be achieved under the premise that the limiting rod 17 is fixedly connected to the screen frame 3. During the up and down movement of the screen 4, the single connecting mechanism II 7 swings up and down.

[0050] Meanwhile, each movable rod 701 is screwed with a limiting nut 703 at the end away from the vibrating screen frame 9. Furthermore, a compression spring III 702 is sleeved on the outside of each movable rod 701. The two axial ends of the compression spring III 702 abut against the screen frame 3 and the limiting nut 703, respectively. When the screen 4 moves upward and deforms, it can pull the movable rod 701 to move away from the screen box 1, causing the compression spring III 702 to be compressed. Similarly, when the force that forces the screen 4 to move upward is removed, the compression spring III 702 releases its elastic potential energy, and the screen 4 can fall quickly, thereby achieving the separation of movement between the screen 4 and the screened material, and realizing the purpose of the screened material re-impacting the screen 4.

[0051] It should be noted that in practice, if the falling position of screen 4 is not constrained, due to inertia, after screen 4 falls to its initial position, it will continue to fall and swing up and down continuously. At this time, although the separation time between the screened material and screen 4 is prolonged and the screened material can obtain greater impact potential energy, screen 4 will give back a large reaction force to the screened material. At this time, the screened material will bounce around, causing the falling point of the screened material to deviate from the expected range.

[0052] Therefore, when the lower end face of the restraining rod 701 of this device abuts against the lower end of the notch 10, the central axis of the limiting nut 703 is perpendicular to the vertical plane. That is, after the upward pushing force applied to the screen 4 is removed, when the screen 4 returns to the initial position, the moving rod 701 will impact the lower end of the notch 10. The impact between the moving rod 701 and the screen box 1 will interfere with the motion inertia of the screen 4 during the falling process, thereby avoiding the screen 4 from providing an upward impact force to the screened material frequently and continuously.

[0053] Specifically, in practice, to control the left and right movement of the screen frame 3, this device has multiple follower mechanisms 12 arranged side by side from left to right on both the front and rear sides of each screen frame 3, such as 3. Figure 4 , Figure 5 , Figure 6 As shown, the follower mechanism 12 includes a base plate 1201 that is fixedly connected to the screen frame 3 by bolts.

[0054] Each follower mechanism 12 contains two vertically L-shaped base plates 1201. The two base plates 1201 are centrally symmetrical, meaning that their projections on the vertical plane together form a rectangular structure. This ensures that the horizontal sections of the two base plates 1201 are in the same vertical plane. Simultaneously, a limiting rod 17 is fixedly connected to the base plate 1202 inside the follower mechanism 12 for fixation.

[0055] Therefore, by setting a corresponding driven mechanism 5 between the two base plates 1201, and by setting a follower rod 1203 on the upper and lower sides of the driven mechanism 5 respectively, the purpose of fixing the two follower rods 1203 to the horizontal sections of the two base plates 1201 can be achieved. At this time, it is only necessary to constrain the driven mechanism 5 to include the transmission rod 502, with the driven rod 501 fixedly connected to one end of the transmission rod 502 near the screen frame 3, and the central axis of the driven rod 501 being perpendicular to the central axis of the follower rod 1203. The driven rod 501 and the follower rod 1203 are in the same vertical plane. Then, during the process of the transmission rod 502 driving the driven rod 501 to rotate, the follower rod 1203 is forced to drive the screen frame 3 to make left and right linear movements by the contact between the driven rod 501 and the follower rod 1203. Meanwhile, since the transmission rod 502 is located between the two base plates 1201, as the transmission rod 502 rotates, the projected length of the driven rod 501 on the vertical plane also gradually changes. That is, as the transmission rod 502 rotates, the driven rod 501 can separate from the follower rod 1203 after rotating to a certain extent, thereby achieving the purpose of canceling the horizontal thrust on the follower rod 1203, i.e., on the screen frame 3.

[0056] Furthermore, this device constrains the line connecting the two follower rods 1203 within a single follower mechanism 12 to be perpendicular to the length side of the corresponding screen frame 3. In addition, the central axis of the transmission rod 502 coincides with the midpoint of the line connecting the two follower rods 1203 within the corresponding follower mechanism 12. This ensures that the two follower rods 1203 move the same length under the drive of the transmission rod 502, that is, the left and right swing amplitude of the screen frame 3 is consistent, thereby curbing the rightward movement distance of the screened material on the screen 4.

[0057] Furthermore, since the two axial ends of the compression spring II 1602 abut against the screen frame 3 and the positioning nut 1601 respectively, and the positioning nut 1601 is screwed to the positioning rod 1603, the initial compression of the single compression spring II 1602 can be changed by rotating the positioning nut 1601 to change the distance between it and the screen frame 3. Thus, under the premise that the left and right movement distance of the screen frame 3 remains unchanged, the elastic potential energy stored in the compression spring II 1602 corresponding to the reset pole state is changed, thereby controlling the reset speed of the screen frame 3, as well as the frequency and duration of its left and right swing after reset.

[0058] Specifically, in order to control the up-and-down swing of the vibrating screen frame 9, this device has a sliding groove I 1202 through each base plate 1201, and a through groove 11 through each screen frame 3 corresponding to the sliding groove I 1202. At this time, by constraining multiple vibrating screen frames 9 to correspond one-to-one with multiple through grooves 11, the front and rear ends of a single vibrating screen frame 9 can protrude out of the screen frame 3 through the corresponding through groove 11 and sliding groove I 1202. At this time, a vibrating screen frame 9 is respectively set on the left and right sides of each transmission rod 502. Therefore, it is only necessary to further constrain the front and rear ends of the vibrating screen frame 9 to be in the same vertical plane with the driven rod 501. Under the premise that the screen frame 3 remains stationary, the transmission rod 502 drives the driven rod 501 to move, thereby driving the vibrating screen frame 9 to move up and down to strike the screen 4.

[0059] It should be noted that, in practice, since the transmission rod 502 rotates continuously in one direction, the driven rod 501 will inevitably apply a thrust in completely opposite directions to the ends of the two vibrating screen frames 9 on its left and right sides. This will result in only one vibrating screen frame 9 being able to move upward and strike the screen 4 under the push of the driven rod 501.

[0060] Therefore, as Figure 3 , Figure 4 , Figure 9 As shown, the device has a sliding hole through the bottom of each driven rod 501, and a positioning shaft 14 is inserted into the sliding hole. A support plate 8 is fixedly connected to the upper end of the positioning shaft 14. The support plate 8 and the ends of the corresponding two vibrating grid frames 9 are in the same vertical plane.

[0061] At this point, it is only necessary to install a compression spring I15 on the outer sleeve of the positioning shaft 14, and constrain the two axial ends of the compression spring I15 to abut against the support plate 8 and the vibrating screen frame 9 respectively. In practice, if the transmission rod 502 rotates clockwise, it can first drive the vibrating screen frame 9 on its left side to strike the screen 4 upwards. Then, it can press down on the vibrating screen frame 9 on its right side to compress the compression spring I15 downwards.

[0062] At the same time, the ends of a single support plate 8 and the corresponding two vibrating screen frames 9 abut against each other. This means that any one of the vibrating screen frames 9 applies downward pressure to the support plate 8, which causes the compression spring I15 to be compressed. This allows multiple vibrating screen frames 9 to continuously vibrate the screen 4 up and down, which is more in line with the actual requirements for small particle size screening processes.

[0063] It should be emphasized that, in practice, during the clockwise rotation of the transmission rod 502, the left vibrating screen frame 9 strikes the screen 4 upwards, causing the screen 4 to move upwards. At this time, the compression spring Ⅲ702 is compressed. After the driven rod 501 disengages from the end of the left vibrating screen frame 9, the elastic potential energy stored in the compression spring Ⅲ702 is released, and the screen 4 drives the left vibrating screen frame 9 to fall quickly. During this movement, a large-stroke, low-frequency striking vibration process can be achieved on the screen 4, which can quickly flatten the material accumulated on the screen 4. Conversely, as the transmission rod 502 continues to rotate, forcing the compression spring I15 to be compressed, and as the transmission rod 502 continues to rotate, after the driven rod 501 disengages from the end of the vibrating screen frame 9 on the right, the elastic potential energy of the compression spring I15 continues to be released. The vibrating screen frame 9 quickly impacts the screen 4 upwards. At this time, due to the presence of the compression spring III702, the screen 4 cannot move up and down significantly. Therefore, the vibrating screen frame 9 on the right will be subjected to a large downward reaction force, which allows the compression spring I15 to be compressed again. This process repeats continuously, enabling the vibrating screen frame 9 on the right to perform short-stroke, high-frequency impact on the screen 4. This process can quickly screen the spread-out screening material.

[0064] It should be noted that during the actual process of the transmission rod 502 driving the driven rod 501 to rotate clockwise, when the driven rod 501 abuts against the end of the left vibrating screen frame 9, the pressure applied by the driven rod 501 to the end of the left vibrating screen frame 9 can be decomposed into vertically upward and horizontally to the right components. Correspondingly, when the driven rod 501 abuts against the end of the right vibrating screen frame 9, the pressure applied by the driven rod 501 to the end of the right vibrating screen frame 9 can be decomposed into vertically downward and horizontally to the left components.

[0065] Therefore, as Figure 6As shown, this device constrains multiple driven mechanisms 5 within the same vertical plane and corresponding to a single screen frame 3. The included angle between the central axes of two adjacent driven rods 501 is 90°. This arrangement ensures that among the multiple driven rods 501 corresponding to a single screen frame 3 within the same vertical plane, when half of the driven rods 501 abuts against the lower follower rod 1203, the other half of the driven rods 501 abuts against the left end of the vibrating screen frame 9. At this time, as the transmission rod 502 rotates, the driven rod 501 abutting against the follower rod 1203 will act as a screen... The screen frame 3 provides a leftward thrust, and the driven rod 501, which abuts against the end of the vibrating screen frame 9, provides a rightward thrust to the screen frame 3. Since the leftward thrust on the screen frame 3 is greater than the rightward thrust, the screen frame 3 can move to the left as expected, and the vibrating screen frame 9 can move upward rapidly (assuming that when the screen frame 3 remains stationary, the driven rod 501 rotates upward 45° to separate from the corresponding vibrating screen frame 9, then when the screen frame 3 moves to the left, the driven rod 501 only needs to rotate upward less than 30° to separate from the corresponding vibrating screen frame 9). Similarly, when one half of the driven rod 501 abuts against the relatively upper follower rod 1203, and the other half abuts against the right end of the vibrating screen frame 9, the screen frame 3 can move to the right as the transmission rod 502 rotates, and the vibrating screen frame 9 can move rapidly to the left.

[0066] It should be emphasized that during the actual clockwise rotation of the driven rod 501 driven by the transmission rod 502, when one half of the driven rod 501 abuts against the relatively upper follower rod 1203, and the other half of the driven rod 501 abuts against the end of the vibrating screen frame 9 on the left, the screen frame 3 can move to the right as expected, while the vibrating screen frame 9 will delay its upward movement (assuming that when the screen frame 3 remains stationary, the driven rod 501 rotates upward by 45° and separates from the corresponding vibrating screen frame 9, then when the screen frame 3 moves to the right, the vibrating screen frame 9 can only move upward relative to the screen frame 3 after the driven rod 501 rotates upward by more than 45°). At the same time, the extended time for the screen 4 to reset to the left means that the screen 4 cannot reset quickly. Similarly, when one half of the driven rod 501 abuts against the lower follower rod 1203, and the other half of the driven rod 501 abuts against the end of the vibrating screen frame 9 on the right, as the transmission rod 502 rotates, the screen frame 3 can move to the left, the vibrating screen frame 9 moves slowly downward, and at the same time, the time for the screen 4 to reset to the right is extended.

[0067] Therefore, in practice, if in the initial state, one half of the driven rod 501 abuts against the lower follower rod 1203, and the other half of the driven rod 501 abuts against the left end of the vibrating screen frame 9, then as the transmission rod 502 rotates, the specific movement process of the screen 4 is as follows: the screen 4 first moves to the left at a medium speed and then quickly moves upward; then the screen 4 continues to move to the left at a medium speed and then quickly moves downward (the driven rod 501 separates from the left end of the vibrating screen frame 9); then the screen 4 quickly returns to its original position to the right and continuously bounces (the driven rod 501 and the left end of the vibrating screen frame 9 separate). (The lower follower rod 1203 separates), then the screen 4 moves to the right at a medium speed (the driven rod 501 abuts against the left vibrating screen frame 9 and the upper follower rod 1203), then the screen 4 resets to the left and moves upward quickly (the driven rod 501 separates from the upper follower rod 1203), then the screen 4 moves downward quickly and jumps continuously (the driven rod 501 separates from the left vibrating screen frame 9), finally, as the transmission rod 502 continues to rotate, the screen 4 reverses the above steps until a complete cycle is formed.

[0068] Specifically, the transmission mechanism of this device includes a positioning tube 503 for fixed connection with the outer end face of the screen box 1, namely the front wall plate 102 and the rear wall plate 101. A driven tube 504 is sleeved on the outside of the positioning tube 503. The driven tube 504 is rotatably connected to the positioning tube 503, and the driven tube 504 is coaxially fixedly connected to the transmission rod 502.

[0069] At the same time, such as Figure 7 As shown, bearings are provided between the positioning tube 503 and the driven tube 504, and between the positioning tube 503 and the transmission rod 502, to reduce frictional loss during rotation. At the same time, the diameter of the driven tube 504 is larger than the diameter of the transmission rod 502, which helps to increase the torque on the transmission rod 502 and ensures that the driven rod 501 can drive the screen frame 3 and the vibrating screen frame 9 to move.

[0070] Specifically, such as Figure 1 As shown, this device has a shared drive mechanism 2 among multiple transmission mechanisms located in the same vertical plane corresponding to a single screen frame 3, such as... Figure 8 As shown, the drive mechanism 2 includes a drive motor 201 fixedly connected to the outer end face of the screen box 1, and a drive wheel 202 is keyed to the output shaft of the drive motor 201.

[0071] Each screen frame 3 has multiple driven tubes 504 and multiple drive wheels 202, all of which are fitted with a transmission belt 203. The transmission belt 203 enables the drive wheels 202 to drive the driven tubes 504 to rotate. Simultaneously, the device has multiple grooves on the inner side of the transmission belt 203, and corresponding mating strips are provided on the outer sides of the drive wheels 202 and driven tubes 504 to engage with these grooves. The meshing of the grooves and mating strips ensures that the transmission belt 203 can achieve its transmission effect.

[0072] Furthermore, the device is equipped with a limiting wheel 204 abutting against the lower side of each transmission belt 203. The limiting wheel 204 is rotatably connected to the screen box 1. The transmission belt 203 is interference-fitted with the drive wheel 202 and the driven tube 504 through the limiting wheel 204.

[0073] In practical use, this invention:

[0074] First, turn on the drive motor 201. Driven by the drive motor 201, the transmission belt 203 drives the corresponding multiple driven tubes 504 to rotate synchronously. At this time, half of the driven rods 501, which are in the same vertical plane and correspond to a single screen frame 3, abut against the follower rod 1203 (assuming it is the lowest follower rod 1203), and the other half of the driven rods 501 abut against the end of the vibrating screen frame 9 (assuming it is the leftmost vibrating screen frame 9).

[0075] Subsequently, as the transmission rod 502 drives the driven rod 501 to rotate 90°, the screen 4 moves to the left at a medium speed and then quickly moves upward -- the screen 4 quickly returns to its original position downward -- the screen 4 quickly returns to its original position to the right -- the screen 4 continues to oscillate.

[0076] Then, as the transmission rod 502 drives the driven rod 501 to continue rotating 90°, the screen 4 moves to the right at a medium speed—the screen 4 moves upward quickly and slowly returns to its original position to the left—the screen 4 continues to oscillate.

[0077] Then, as the transmission rod 502 drives the driven rod 501 to continue rotating 90°, the screen 4 moves to the right at a medium speed and then quickly moves downward—the screen 4 quickly returns to its original position—the screen 4 quickly returns to its original position to the left—the screen 4 continues to oscillate up and down with large amplitude and high frequency.

[0078] Then, as the transmission rod 502 drives the driven rod 501 to continue rotating 90°, the screen 4 moves to the left at a medium speed—the screen 4 moves downward quickly and slowly returns to the right—the screen 4 continues to oscillate up and down with large amplitude and high frequency.

[0079] Finally, the corresponding transfer equipment is turned on to tilt the crushed sieve material to the left end of the uppermost screen 4. As the screening process continues, sieve materials of different particle sizes are transferred to specific processing steps or reworked to the crushing equipment for re-crushing.

[0080] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-stage screening device for an integrated sand making plant, comprising a screen box (1) composed of a front wall panel (102) and a rear wall panel (101), wherein the front wall panel (102) and the rear wall panel (101) are fixedly connected by a connecting rod (103), and wherein multiple screens (4) are arranged side by side at equal intervals from top to bottom between the front wall panel (102) and the rear wall panel (101), characterized in that: It also includes multiple screen frames (3) arranged equidistantly from top to bottom, each screen frame (3) corresponding to multiple screens (4), and each screen frame (3) has multiple connecting mechanisms I (16) arranged from front to back on its left and right sides respectively, and the screen frame (3) is slidably connected to the screen box (1) through the connecting mechanisms I (16). Each of the screens (4) is located inside the corresponding screen frame (3), and each of the screens (4) has multiple connecting mechanisms II (7) connected side by side from left to right on the front and rear sides respectively. The screens (4) are elastically connected to the screen frame (3) through the connecting mechanisms II (7). Each of the screen frames (3) has multiple follower mechanisms (12) arranged side by side from left to right on the front and back sides respectively. Each follower mechanism (12) includes two base plates (1201) with an L-shaped structure in vertical projection. The two base plates (1201) are centrally symmetrical. Furthermore, a follower mechanism (5) including a follower rod (501) is provided between the two base plates (1201). Each of the driven mechanisms (5) is provided with a follower rod (1203) on the upper and lower sides respectively, and the two follower rods (1203) are fixedly connected to the horizontal sections of the two base plates (1201) respectively. Furthermore, each of the base plates (1201) is provided with a through groove I (1202). Each of the screen frames (3) has multiple through slots (11) extending from left to right through the sliding groove I (1202). Furthermore, each of the screens (4) has multiple vibrating screen frames (9) arranged side by side from left to right on its lower side. The multiple vibrating screen frames (9) correspond one-to-one with the multiple through slots (11). Each vibrating screen frame (9) has its front and rear ends respectively passing through the corresponding through slot (11) and the sliding groove I (1202). The front and rear ends of each of the vibrating mesh frames (9) and each of the follower rods (1203) and the corresponding driven rods (501) are in the same vertical plane, and the central axis of each driven rod (501) is perpendicular to the central axis of the follower rod (1203); Within multiple driven mechanisms (5) located in the same vertical plane and corresponding to a single screen frame (3), the central axes of two adjacent driven rods (501) are perpendicular to each other; Each of the driven mechanisms (5) includes a positioning tube (503) fixedly connected to the outer end face of the sieve box (1), a driven tube (504) is sleeved on the outside of the positioning tube (503), the driven tube (504) is rotatably connected to the positioning tube (503), and a transmission rod (502) is coaxially fixedly connected to the inner side of the driven tube (504). The screen box (1) has a rectangular array of through holes, each through hole corresponding to a transmission rod (502). Each transmission rod (502) extends through the through hole into the screen box (1). The end of each transmission rod (502) away from the driven tube (504) is fixedly connected to the driven rod (501). During the rotation of the driven rod (501) driven by the transmission rod (502), the driven rod (501) and the follower rod (1203) abut against each other, forcing the follower rod (1203) to drive the screen frame (3) to make left and right linear movements.

2. The multi-stage screening device for an integrated sand making plant according to claim 1, characterized in that: The line connecting the two follower rods (1203) in each follower mechanism (12) is perpendicular to the length side of the corresponding screen frame (3), and the line connecting the two vibrating screen frames (9) in each follower mechanism (12) is parallel to the length side of the corresponding screen frame (3).

3. The multi-stage screening device for an integrated sand making plant according to claim 2, characterized in that: A support plate (8) is provided between the two base plates (1201) in each of the following mechanisms (12). A positioning shaft (14) is fixedly connected to the lower end of the support plate (8). The positioning shaft (14) is slidably connected to the vibrating screen frame (9). A compression spring I (15) is sleeved on the outside of the positioning shaft (14). The two axial ends of the compression spring I (15) abut against the support plate (8) and the vibrating screen frame (9) respectively. Each of the support plates (8) and the portion of the corresponding vibrating mesh frame (9) protruding from the base plate (1201) are in the same vertical plane, and when the compression spring I (15) is not affected by external force, the midpoint of the line connecting the two follower rods (1203) in the single follower mechanism (12) coincides with the midpoint of the line connecting the two vibrating mesh frames (9) in the single follower mechanism (12).

4. The multi-stage screening device for an integrated sand making plant according to claim 1, characterized in that: A drive mechanism (2) is provided between the multiple driven tubes (504) corresponding to each screen frame (3). The drive mechanism (2) includes a drive motor (201) fixedly connected to the outer end face of the screen box (1), and a drive wheel (202) is fixedly connected to the output shaft of each drive motor (201).

5. The multi-stage screening device for an integrated sand making plant according to claim 4, characterized in that: The drive motor (201) also includes a transmission belt (203). Each transmission belt (203) is sleeved on the outside of the driven tube (504) and the drive wheel (202) corresponding to a single screen frame (3). A limit wheel (204) is also provided on the lower side of each transmission belt (203). The limit wheel (204) is rotatably connected to the screen box (1). The transmission belt (203) is interference-fitted with the drive wheel (202) and the driven tube (504) through the limit wheel (204).

6. The multi-stage screening device for an integrated sand making tower according to claim 1, characterized in that: Each of the connecting mechanisms I (16) includes a positioning rod (1603) for fixed connection with the screen box (1), a compression spring II (1602) is sleeved on the outside of the positioning rod (1603), and a positioning nut (1601) is screwed to one end of each positioning rod (1603) away from the corresponding screen frame (3). Each of the screen frames (3) has multiple positioning holes (13) arranged side by side from front to back on both sides. The multiple positioning holes (13) correspond one-to-one with multiple positioning rods (1603). Each positioning rod (1603) is inserted into the positioning hole (13). The two axial ends of each compression spring II (1602) abut against the screen box (1) and the positioning nut (1601) respectively.

7. The multi-stage screening device for an integrated sand making plant according to claim 1, characterized in that: Each of the connecting mechanisms II (7) includes a movable rod (701), a sliding groove II (704) is provided through the movable rod (701), and a limiting rod (17) is inserted into each of the sliding grooves II (704), and the limiting rod (17) is fixedly connected to the adjacent follower mechanism (12). Each of the movable rods (701) has a limiting nut (703) screwed onto the end away from the vibrating net frame (9), and each of the movable rods (701) has a compression spring III (702) sleeved on the outside, with the two axial ends of the compression spring III (702) abutting against the follower mechanism (12) and the limiting nut (703) respectively.

8. The multi-stage screening device for an integrated sand making plant according to claim 7, characterized in that: Each of the vibrating screen frames (9) has multiple notches (10) that are equidistantly spaced from left to right on the upper ends of the front and rear sides. The multiple notches (10) correspond one-to-one with multiple movable rods (701). Furthermore, each of the movable rods (701) is movably connected to the screen (4) on the side near the screen (4) through the connecting mechanism III (6). Each of the movable rods (701) protrudes into the inside of the screen box (1) through the notch (10), and when the lower end face of the movable rod (701) abuts against the lower end of the notch (10), the central axis of the limiting nut (703) is perpendicular to the vertical plane.

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