A multi-stage sifting roller screen

Abstract

The present application relates to mesh screen technical field, especially for a kind of multistage screening's rolling screen, including inner layer screen cylinder, inner layer screen cylinder is made of first inner cylinder screen and second inner cylinder screen, and the surface of both is provided with the same number of screen hole, for the screening of material, by the slight rotation of first inner cylinder screen relative to second inner cylinder screen, adjust the overlapping area of two screen cylinder screen hole, realize the adjustment of screening size, outer layer screen cylinder, it is set to the outside of inner layer screen cylinder, for the secondary classification of material after screening in inner layer screen cylinder, outer layer screen cylinder includes four pieces of combined screen plate, realize the size of inner layer screen cylinder screen hole subtle adjustment, reach the effect of flexible fine adjustment screening size, simultaneously, after adjustment is completed, the locking state of transmission seat and mounting ring is switched by locking mechanism, ensure that screen hole diameter does not automatically change with vibration in normal screening operation, so that rolling screen can adjust the screening precision of material without replacement or additional screen cylinder.

Description

Technical Field

[0001] This invention relates to the field of mesh screen technology, specifically a multi-stage sieving rotary screen. Background Technology

[0002] Rotary rotary screens are key equipment for material classification and processing, widely used in industries such as mining, building materials, and chemicals. They utilize the inertial force generated by the rotation of the screen cylinder to achieve material screening. Multi-stage rotary rotary screens, by connecting multiple screens with different apertures in series, can complete multi-stage material sorting in one go. Compared with single-stage rotary rotary screens, they not only reduce equipment investment and floor space but also shorten the process flow, improve classification efficiency and material sorting accuracy, and meet the multi-stage screening needs under complex working conditions.

[0003] Most existing multi-stage rotary screens use a fixed-aperture integrated structure for the inner screen cylinder, which cannot be adjusted after leaving the factory, resulting in limited equipment adaptability. When fine-size grading of materials is required, the entire inner screen cylinder needs to be replaced, or screen cylinders of different precision need to be added to the outer or inner layers of the inner screen cylinder. This not only increases spare parts costs and downtime, but also presents problems such as cumbersome disassembly and assembly of the screen cylinders, high labor intensity, and high costs. In addition, the fixed aperture design is difficult to cope with scenarios with fluctuations in material particle size, and is prone to insufficient grading accuracy or screen clogging. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-stage screening rotary screen to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A multi-stage screening rotary screen includes an inner screen cylinder, which is composed of a first inner screen and a second inner screen. Both screens have screen holes of the same size and number on their surfaces for screening materials. By slightly rotating the first inner screen relative to the second inner screen, the overlapping area of ​​the screen holes of the two screen cylinders is adjusted, thereby adjusting the screening size.

[0007] The outer screen cylinder is located outside the inner screen cylinder and is used for secondary grading of materials after screening by the inner screen cylinder. The outer screen cylinder includes four combined screen plates, which are connected to each other by multiple connecting strips.

[0008] The transmission mechanism includes a mounting ring, a rotating shaft, a connecting rod, and a transmission seat. The mounting ring is located at both ends of the inner screen cylinder. The transmission seat is installed on the inner side of the mounting ring and is fixedly connected to the first inner screen cylinder. The transmission seat is connected to the rotating shaft through the connecting rod and is used to drive the inner screen cylinder and the outer screen cylinder to rotate synchronously to complete the screening operation.

[0009] A locking mechanism, located at one end of the rotating shaft, is used to switch the locked or unlocked state of the transmission seat and the mounting ring, so as to enable the independent driving of the first inner cylinder screen to rotate.

[0010] Preferably, the inner cavity of the connecting rod is provided with an inner sleeve rod. One end of the inner sleeve rod passes through the inner cavity of the rotating shaft and is fixedly connected to a pressure block. The other end is provided with a first magnetic ring on both sides. The bottom of the transmission seat is provided with a disconnection groove adapted to the inner sleeve rod. The inner wall of the mounting ring is provided with a mounting groove. The transmission seat is set in the mounting groove. The inner cavity of the mounting groove is provided with a number of fixing holes on both sides. The two sides of the transmission seat are provided with positioning members. The transmission seat is fixed in the inner cavity of the mounting groove by the positioning members engaging with the fixing holes. After the inner sleeve rod enters the disconnection groove, the first magnetic ring and the positioning member are at the same height, thereby disconnecting the connection between the positioning member and the fixing hole.

[0011] Preferably, the locking mechanism includes a movable seat, a pressing block, a threaded seat, and a screw. The pressing block is located on the outside of the movable seat and has the same number as the connecting rod. The threaded seat is located on one side of the movable seat. The screw passes through the threaded seat and is connected to the movable seat. The position of the movable seat can be adjusted by rotating the screw. The contact surfaces of the pressing block and the pressing block are set as mutually adaptable inclined surfaces. By controlling the movement of the movable seat, one end of the inner sleeve rod can be inserted into the inner cavity of the disconnection groove, so that the first magnetic ring corresponds to the positioning member.

[0012] Preferably, the positioning component includes a positioning cylinder, a return spring, a second magnetic ring, and a positioning cap. The positioning cylinder is fixed to both sides of the transmission seat. The positioning cap is located at one end of the inner cavity of the positioning cylinder and is adapted to the fixing hole. The second magnetic ring is located at the other end of the positioning cap and attracts each other with the corresponding surface of the first magnetic ring. The return spring is located in the inner cavity of the positioning cylinder and is used to provide elastic force to make the positioning cap embed into the fixing hole.

[0013] Preferably, a coupling mechanism is provided on the outer side of the first inner cylinder screen, and the inner and outer screen cylinders are connected by the coupling mechanism. A movable groove is provided on the outer side of the first inner cylinder screen, and a toothed rack is provided on the inner wall of the movable groove.

[0014] Preferably, the coupling mechanism includes a telescopic rod and a helical shaft, the bottom of the telescopic rod is provided with a gear that meshes with a rack, and the helical shaft is fixedly connected to the telescopic rod.

[0015] Preferably, the connecting strip includes a fixed base, and the fixed base has a movable groove on each side. The combined sieve plate is composed of two sieve plates, both of which are provided with sieve holes of the same size and number, and the two sieve plates can move along the inner cavity of the movable groove.

[0016] Preferably, the fixed base is provided with a displacement groove, the inner cavity of the displacement groove is provided with a displacement block, the top of the displacement block is provided with a spiral hole adapted to the spiral shaft, the spiral shaft passes through the spiral hole and is fixedly connected to the bottom of the fixed base, one side of the displacement block is set as an inclined surface, and the movement of the displacement block is controlled by the spiral shaft, so that the two screen plates of the combined screen plate can be displaced to different degrees.

[0017] Preferably, the outer side of the mounting ring is provided with a connecting hole, the spiral shaft passes through the connecting hole and is connected to the fixed seat, and the inner wall of the connecting hole is provided with a spiral groove that matches the outer side of the spiral shaft.

[0018] Preferably, the telescopic rod includes a fixed rod, and a movable sleeve is sleeved at each end of the fixed rod. The inner wall of the movable sleeve is provided with a sliding groove, and the outer side of the fixed rod is provided with a slider that matches the sliding groove, so that the telescopic rod can transmit torque and realize extension and retraction.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. This invention features a double-layered inner screen structure consisting of a first inner screen and a second inner screen. An operating locking mechanism connects the first inner screen to a rotating shaft, allowing for slight rotation of the shaft to adjust the overlapping area of ​​the screen holes in both inner screens. This enables fine-tuning of the screen hole size within the inner screen, achieving flexible micro-adjustment of the screening dimensions. Simultaneously, after adjustment, the locking mechanism switches the locking state of the transmission seat and the mounting ring, ensuring that the screen hole diameter does not automatically change with vibration during normal screening operations. This allows the rotary screen to adjust material screening accuracy without replacing or adding screen cylinders.

[0021] 2. In addition, the inner screen hole adjustment is achieved through a coupling mechanism, which simultaneously increases the distance between the inner and outer screen cylinders when the inner screen hole is enlarged and decreases the distance when it is reduced. This avoids the problem of coarse material getting stuck in the distance between the multi-stage screen cylinders after the inner screen hole is enlarged, further ensuring the smoothness of the screening process and solving the problem of decreased screening efficiency and increased equipment wear caused by material getting stuck after screen hole adjustment.

[0022] 3. Based on the above structure, the inner and outer sieve apertures are synchronously adjusted through a coupling mechanism. When the inner sieve aperture is enlarged or decreased, the outer sieve aperture is adjusted in the same direction and amplitude, so that the aperture gradient of multi-stage screening is always reasonably matched. This ensures the coordination of screening accuracy at different levels, solves the linkage problem that adjusting the inner sieve aperture alone can easily lead to imbalance of aperture at different levels and reduced classification accuracy, and improves the overall stability of screening quality. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of a multi-stage screening rotary screen according to the present invention;

[0024] Figure 2 This is a schematic diagram of the overall structure of the screen cylinder in a multi-stage screening rotary screen according to the present invention;

[0025] Figure 3 For the present invention Figure 2 Schematic diagram of the end structure of the inner middle layer screen cylinder;

[0026] Figure 4 For the present invention Figure 3 A schematic diagram of the overall structure of the transmission mechanism;

[0027] Figure 5 For the present invention Figure 4 A schematic diagram of the overall structure of the central transmission seat;

[0028] Figure 6 For the present invention Figure 4 Enlarged view of the structure in area B;

[0029] Figure 7 For the present invention Figure 4 Enlarged view of the structure in area C;

[0030] Figure 8 For the present invention Figure 3 Enlarged view of the structure of area A in the middle;

[0031] Figure 9 For the present invention Figure 8 A schematic diagram of the overall structure of the telescopic boom;

[0032] Figure 10 This is a partial structural diagram of the outer screen cylinder in a multi-stage screening rotary screen according to the present invention;

[0033] Figure 11 For the present invention Figure 10 A schematic diagram of the connecting strip is shown, along with the combined sieve plate;

[0034] Figure 12 This is a diagram showing the variation of the screen holes in the inner layer of the rotating screen for multi-stage screening according to the present invention.

[0035] In the diagram: 100, inner screen cylinder; 110, first inner screen cylinder; 111, movable groove; 112, rack; 120, second inner screen cylinder; 130, coupling mechanism; 131, telescopic rod; 132, screw shaft; 1311, fixed rod; 1312, movable sleeve; 200, outer screen cylinder; 210, combined screen plate; 220, connecting strip; 221, fixed base; 222, moving groove; 223, displacement groove; 224, displacement block; 300, transmission mechanism; 310, mounting ring; 31 1. Connecting hole; 312. Mounting groove; 313. Fixing hole; 320. Rotating shaft; 330. Connecting rod; 331. Inner sleeve rod; 332. First magnetic ring; 333. Pressure block; 340. Transmission seat; 341. Disconnection groove; 350. Locking mechanism; 351. Moving seat; 352. Pressing block; 353. Threaded seat; 354. Screw; 360. Positioning component; 361. Positioning cylinder; 362. Return spring; 363. Second magnetic ring; 364. Positioning cap; 400. Mounting seat. Detailed Implementation

[0036] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0038] like Figure 1-3 As shown, this embodiment discloses a multi-stage screening rotary screen, including an inner screen cylinder 100, an outer screen cylinder 200, and a transmission mechanism 300. The outer screen cylinder 200 is mounted on a mounting base 400, and the inner screen cylinder 100 is disposed inside the outer screen cylinder 200. The transmission mechanism 300 includes two mounting rings 310 disposed at both ends of the inner screen cylinder 100, a rotating shaft 320, a connecting rod 330, and a transmission seat 340. Each mounting ring 310 has four transmission seats 340 disposed on its inner wall. The transmission seats 340 are connected to the rotating shaft 320 through the connecting rod 330. The inner screen cylinder 100 is connected to the outer screen cylinder 200 through a coupling mechanism 130. The rotating shaft 320 is driven to rotate by a motor, so that the inner screen cylinder 100 and the outer screen cylinder 200 rotate synchronously. The material is screened sequentially through the screen holes opened on the inner screen cylinder 100 and the outer screen cylinder 200.

[0039] Furthermore, in the prior art, the inner screen cylinder 100 of the multi-stage rotary screen is mostly a fixed space structure. If the screen holes of the inner screen cylinder 100 cannot be adjusted, the inner screen cylinder 100 will uniformly screen materials smaller than the screen holes into the inner cavity of the outer screen cylinder 200. If it is necessary to classify the materials into fine sizes, it is necessary to replace the inner screen cylinder 100 to change the diameter of the screen holes, or add a screen cylinder with a different screen hole diameter than the inner screen cylinder 100, and set it on the outside or inside of the inner screen cylinder 100. The disassembly and assembly of the screen cylinder is cumbersome and requires the use of tools such as cranes. Therefore, it is quite cumbersome when it is necessary to screen materials of different sizes.

[0040] like Figure 3 , Figure 4 , Figure 6 As shown, the inner sieve cylinder 100 in this device is composed of a first inner sieve cylinder 110 and a second inner sieve cylinder 120. Both the first inner sieve cylinder 110 and the second inner sieve cylinder 120 have sieve holes of the same size and number on their surfaces. The first inner sieve cylinder 110 is longer than the second inner sieve cylinder 120. One side of the transmission seat 340 is fixedly connected to a protruding section of the inner wall of the first inner sieve cylinder 110. One end of the rotating shaft 320 is provided with a locking mechanism 350. The locking mechanism 350 includes a movable seat 351, a pressing block 352, a threaded seat 353, and a screw 354. The movable seat 351 is located at the end of the rotating shaft 320, and four pressing blocks 352 are provided on its outer side. A threaded seat 354 is provided on one side of the movable seat 351. 53. A threaded seat 353 is located on one side of a movable seat 351. A screw 354 passes through the threaded seat 353 and is connected to the movable seat 351. The screw 354 and the threaded seat 353 are threaded together. By rotating the screw 354, it can be moved forward. The forward movement of the screw 354 drives the movable seat 351 and the four pressing blocks 352 to move forward synchronously. The inner cavity of the fixed rod 330 is movably sleeved with an inner sleeve rod 331. One end of the inner sleeve rod 331 passes through the rotating shaft 320 and is connected to a pressure block 333. The contact surface between the pressure block 333 and the pressing block 352 is set as mutually compatible inclined surfaces. When the pressing block 352 moves forward, the inner sleeve rod 331 moves forward through the inclined surface cooperation.

[0041] like Figure 5 , Figure 7As shown, the inner wall of the mounting ring 310 has a mounting groove 312. A number of fixing holes 313 are formed on both sides of the inner cavity of the mounting groove 312. The transmission seat 340 is disposed in the mounting groove 312, and positioning elements 360 are respectively provided on both sides of the transmission seat 340. The positioning element 360 includes a positioning cylinder 361, a return spring 362, a second magnetic ring 363, and a positioning cap 364. The positioning cylinder 361 is fixed to both sides of the transmission seat 340. A positioning cap 364 is provided at one end of the inner cavity of the positioning cylinder 361, and a second magnetic ring 363 is provided at one end of the positioning cap 364. The return spring 362 is located on one side of the second magnetic ring 363. The return spring 362 provides elastic force to fix the positioning cap 364 in the inner cavity of the fixing hole 313, thus locking the transmission seat 340 in the inner cavity of the mounting groove 312. The transmission seat 340 is fixedly connected to the mounting ring 310. At this time, the rotating shaft 320 is driven by a motor to rotate, allowing the inner... The inner screen cylinder 100 and the outer screen cylinder 200 rotate to perform screening operations. The inner sleeve rod 331 has first magnetic rings 332 on both sides of its contact point with the transmission seat 340. The bottom of the transmission seat 340 has a connecting groove 341 that matches the inner sleeve rod 331. The corresponding surfaces of the first magnetic ring 332 and the second magnetic ring 363 attract each other. When the pressing block 352 moves forward, causing the pressing block 333 to push the inner sleeve rod 331 forward, one end of the inner sleeve rod 331 enters... The inner cavity of the disconnection groove 341 causes the first magnetic ring 332 to move to the rear of the second magnetic ring 363. The first magnetic ring 332 generates an attraction force on the second magnetic ring 363, causing the second magnetic ring 363 to drive the positioning cap 364 to move backward, so that the positioning cap 364 disengages from the inner cavity of the fixing hole 313. At this time, the transmission seat 340 can move along the inner wall of the mounting groove 312. By driving the rotating shaft 320 slightly by the motor, the first inner cylinder screen 110 can be slightly rotated.

[0042] like Figure 12 As shown, when the first inner cylinder screen 110 rotates slightly, the overlapping area of ​​the screen holes on its surface and the screen holes on the surface of the second inner cylinder screen 120 changes. When the overlapping area of ​​the two sets of screen holes shrinks, the screen hole diameter of the inner layer screen cylinder 100 becomes smaller because the first inner cylinder screen 110 and the second inner cylinder screen 120 are attached together. Only materials smaller than this screen hole can pass through the inner layer screen cylinder 100 and enter the inner cavity of the outer layer screen cylinder 200. By rotating the first inner cylinder screen 110, the screen holes of the inner layer screen cylinder 100 can be enlarged, thereby realizing the graded adjustment of the screen hole size of the inner layer screen cylinder 100. This allows the rotary screen to screen materials of different particle sizes without replacing the screen cylinder, thus improving both screening efficiency and accuracy.

[0043] like Figure 7As shown, after the screen hole size of the inner screen cylinder 100 is adjusted, the pressing block 352 is returned to its original position by rotating the screw 354 in the opposite direction, and the inner sleeve rod 331 is no longer pressed. A spring is provided in the inner cavity of the disconnection groove 341. When the pressing block 352 returns to its original position, the spring pushes the inner sleeve rod 331 back to its original position, so that the first magnetic ring 332 is no longer directly behind the second magnetic ring 363. At this time, the positioning cap 364 loses its backward attraction and is bounced forward by the reset spring 362, so that the positioning cap 364 re-enters the inner cavity of the fixing hole 313. After the screen hole size of the inner screen cylinder 100 is adjusted, its position is fixed. At this time, the rotating shaft 320 is driven by the motor to rotate, so that the inner screen cylinder 100 is kept at the adjusted screen hole size for screening operations.

[0044] like Figure 8 , Figure 10 As shown, the outer side of the first inner cylinder screen 110 is provided with a movable groove 111, and a rack 112 is provided on one side of the inner wall of the movable groove 111. The coupling mechanism 130 includes a telescopic rod 131 and a spiral shaft 132. The bottom end of the telescopic rod 131 is located in the inner cavity of the movable groove 111, and a gear adapted to the rack 112 is fixedly connected to the bottom end of the telescopic rod 131. The top end of the telescopic rod 131 is fixedly connected to the spiral shaft 132. The outer screen cylinder 200 includes four combined screen plates 210, which are connected to each other by multiple connecting strips 220 to form the outer screen cylinder 200. One end of the spiral shaft 132 is fixedly connected to the fixed seat 221. When the first inner cylinder screen 110 rotates to adjust the screen hole diameter of the inner screen cylinder 100, the rack 112 moves. The movement of the rack 112 causes the gear at the bottom of the telescopic rod 131 to rotate, which in turn drives the spiral shaft 132 to rotate. Figure 4 As shown, the outer side of the mounting ring 310 is provided with a connecting hole 311. The spiral shaft 132 passes through the connecting hole 311 and connects to the fixed seat 221. The inner wall of the connecting hole 311 is provided with a spiral groove that matches the outer side of the spiral shaft 132. When the spiral shaft 132 rotates, it moves along the connecting hole 311. When the screen holes of the inner screen cylinder 100 are enlarged, the spiral shaft 132 pushes the connecting strip 220 outward. Figure 11As shown, the connecting bar 220 includes a fixed base 221, and movable grooves 222 are provided on both sides of the fixed base 221. The combined screen plate 210 can move along the movable grooves 222. When the connecting bar 220 moves outward at the same time, all the combined screen plates 210 move outward along the movable grooves 222 at the same time, thereby increasing the overall diameter of the outer screen cylinder 200 and increasing the distance between the outer screen cylinder 200 and the inner screen cylinder 100. Since the screen holes of the inner screen cylinder 100 are larger, larger material particles enter the outer screen cylinder 200, which can prevent coarse particles from getting stuck in the distance between the inner screen cylinder 100 and the outer screen cylinder 200, thus improving the conveying efficiency. Conversely, when the screen holes of the inner screen cylinder 100 are reduced, the distance between the inner screen cylinder 100 and the outer screen cylinder 200 decreases accordingly, preventing fine particles from scattering and mixing, ensuring screening accuracy, and making operation convenient while reducing energy consumption and wear.

[0045] like Figure 11 As shown, the combined screen plate 210 consists of two layers of screen plates, both of which have the same number and size of screen holes. The top surface of the fixed base 221 has a displacement groove 223, and the inner cavity of the displacement groove 223 contains a displacement block 224. The top of the displacement block 224 has a spiral hole adapted to the spiral shaft 132. The spiral shaft 132 passes through this spiral hole and is fixedly connected to the bottom of the fixed base 221. One side of the displacement block 224 is a sloping surface that is wider at the top and narrower at the bottom, used to push the two layers of screen plates of the combined screen plate 210 to move relative to each other. When the inner screen cylinder 100 increases the size of the screen holes, the spiral shaft 132 rotates as it moves outward. The rotation of the spiral shaft 132 drives the displacement block 224 along the displacement groove 223 through the spiral hole. As the inner cavity of 23 moves downward, and the displacement block 224 gradually moves downward, the two screen plates of the combined screen plate 210 are slightly displaced to different degrees due to the narrow bottom and wide top. This increases the overlapping area of ​​the screen holes of the two screen plates of the combined screen plate 210. When the inner screen cylinder 100 reduces the screen hole size, the overlapping area of ​​the two screen plates of the combined screen plate 210 decreases accordingly. This makes the screen hole adjustment of the inner screen cylinder 100 and the outer screen cylinder 200 of the rolling screen match, and the aperture gradient of the multi-stage screening always maintains a reasonable match. This ensures the coordination of screening accuracy at different levels and solves the linkage problem that adjusting the inner screen hole alone can easily lead to imbalance of the aperture at different levels and a reduction in classification accuracy.

[0046] like Figure 9 As shown, the telescopic rod 131 includes a fixed rod 1311, and a movable sleeve 1312 is respectively sleeved at both ends of the fixed rod 1311. The inner wall of the movable sleeve 1312 is provided with a sliding groove, and the outer side of the fixed rod 1311 is provided with a slider that matches the sliding groove, so that the telescopic rod 131 can transmit torque and realize extension and retraction. When the first inner cylinder screen 110 rotates, the telescopic rod 131 provides torque to rotate the spiral shaft 132. Through the extension and retraction function of the telescopic rod 131, the spiral shaft 132 pushes the fixed seat 221 to move.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. The present invention is not limited to the above embodiments; the embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A multi-stage screening rotary screen, characterized in that, include: The inner screen cylinder (100) is composed of a first inner screen cylinder (110) and a second inner screen cylinder (120). Both screen cylinders have screen holes of the same size and number on their surfaces for screening materials. By slightly rotating the first inner screen cylinder (110) relative to the second inner screen cylinder (120), the overlapping area of ​​the screen holes of the two screen cylinders is adjusted, thereby adjusting the screening size. The outer screen cylinder (200) is located outside the inner screen cylinder (100) and is used for secondary grading of materials after screening by the inner screen cylinder (100). The outer screen cylinder (200) includes four combined screen plates (210) and the combined screen plates (210) are connected to each other by multiple connecting strips (220). The transmission mechanism (300) includes a mounting ring (310), a rotating shaft (320), a connecting rod (330), and a transmission seat (340). The mounting ring (310) is located at both ends of the inner screen cylinder (100). The transmission seat (340) is installed on the inner side of the mounting ring (310) and fixedly connected to the first inner screen cylinder (110). The transmission seat (340) is connected to the rotating shaft (320) through the connecting rod (330) and is used to drive the inner screen cylinder (100) and the outer screen cylinder (200) to rotate synchronously to complete the screening operation. The locking mechanism (350) is located at one end of the rotating shaft (320) and is used to switch the locking or unlocking state of the transmission seat (340) and the mounting ring (310) so as to drive the first inner cylinder screen (110) to rotate independently. The outer side of the first inner cylinder screen (110) is provided with a coupling mechanism (130), and the inner layer screen cylinder (100) and the outer layer screen cylinder (200) are connected through the coupling mechanism (130). The outer side of the first inner cylinder screen (110) is provided with a movable groove (111), and the inner wall of the movable groove (111) is provided with a rack (112). The coupling mechanism (130) includes a telescopic rod (131) and a helical shaft (132). The bottom of the telescopic rod (131) is provided with a gear that meshes with a rack (112). The helical shaft (132) is fixedly connected to the telescopic rod (131). The connecting strip (220) includes a fixed seat (221), and the fixed seat (221) has a moving groove (222) on both sides. The combined sieve plate (210) is composed of two sieve plates. Both sieve plates are provided with sieve holes of the same size and number, and the two sieve plates can move along the inner cavity of the moving groove (222). The fixed base (221) is provided with a displacement groove (223), and the inner cavity of the displacement groove (223) is provided with a displacement block (224). The top of the displacement block (224) is provided with a spiral hole that is adapted to the spiral shaft (132). The spiral shaft (132) passes through the spiral hole and is fixedly connected to the bottom of the fixed base (221). One side of the displacement block (224) is set as an inclined surface. By controlling the movement of the displacement block (224) through the spiral shaft (132), the two screen plates of the combined screen plate (210) can be displaced to different degrees. The mounting ring (310) has a connecting hole (311) on its outer side. The spiral shaft (132) passes through the connecting hole (311) and is connected to the fixing seat (221). The inner wall of the connecting hole (311) is provided with a spiral groove that is adapted to the outer side of the spiral shaft (132).

2. The multi-stage screening rotary screen according to claim 1, characterized in that: The inner cavity of the fixed connecting rod (330) is provided with an inner sleeve rod (331). One end of the inner sleeve rod (331) passes through the inner cavity of the rotating shaft (320) and is fixedly connected to a pressure block (333). The other end is provided with a first magnetic ring (332) on both sides. The bottom of the transmission seat (340) is provided with a disconnection groove (341) adapted to the inner sleeve rod (331). The inner wall of the mounting ring (310) is provided with a mounting groove (312). The transmission seat (340) is set in the mounting groove (312). The mounting groove (312) has a number of fixing holes (313) on both sides of its inner cavity. The transmission seat (340) is provided with positioning members (360) on both sides. The transmission seat (340) is fixed in the inner cavity of the mounting groove (312) by the positioning members (360) and the fixing holes (313). After the inner sleeve rod (331) enters the disconnection groove (341), the first magnetic ring (332) corresponds to the positioning member (360) and the connection between the positioning member (360) and the fixing hole (313) is released.

3. The multi-stage screening rotary screen according to claim 2, characterized in that: The locking mechanism (350) includes a movable seat (351), a pressing block (352), a threaded seat (353), and a screw (354). The pressing block (352) is located on the outside of the movable seat (351) and has the same number as the fixed rod (330). The threaded seat (353) is located on one side of the movable seat (351). The screw (354) passes through the threaded seat (353) and is connected to the movable seat (351). The position of the movable seat (351) can be adjusted by rotating the screw (354). The contact surfaces of the pressing block (333) and the pressing block (352) are set as mutually compatible inclined surfaces. By controlling the movement of the movable seat (351), one end of the inner sleeve rod (331) can be inserted into the inner cavity of the disconnection groove (341), so that the first magnetic ring (332) corresponds to the positioning member (360).

4. The multi-stage screening rotary screen according to claim 2, characterized in that: The positioning component (360) includes a positioning cylinder (361), a return spring (362), a second magnetic ring (363), and a positioning cap (364). The positioning cylinder (361) is fixed on both sides of the transmission seat (340). The positioning cap (364) is located at one end of the inner cavity of the positioning cylinder (361) and is adapted to the fixing hole (313). The second magnetic ring (363) is located at the other end of the positioning cap (364) and attracts each other with the corresponding surface of the first magnetic ring (332). The return spring (362) is located in the inner cavity of the positioning cylinder (361) and is used to provide elastic force to make the positioning cap (364) embed into the fixing hole (313).

5. A multi-stage screening rotary screen according to claim 1, characterized in that: The telescopic rod (131) includes a fixed rod (1311), and a movable sleeve (1312) is respectively sleeved at both ends of the fixed rod (1311). The inner wall of the movable sleeve (1312) is provided with a sliding groove, and a slider adapted to the sliding groove is provided on the outer side of the fixed rod (1311), so that the telescopic rod (131) can transmit torque and realize extension and retraction.

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