A rotary drum dryer integrated screening device

Abstract

The utility model discloses a kind of rotary drum dryer integrated screening devices, it is related to rotary drum dryer technical field, including cylinder screen, it is cylindrical structure and with the cylinder body of dryer coaxial arrangement, its one end is equipped with feed inlet and with the tail end of the cylinder body of the dryer detachable communication, the other end extends to the direction of deviating from the dryer, and is equipped with discharge port;The outer circumferential wall of the cylinder screen is arrayed with sieve hole, to solve the problem that material is not matched in prior art through rotary drum dryer and screening device, resulting in product yield, quality fluctuation.

Description

Technical Field

[0001] This utility model relates to the field of rotary drum dryer technology, and in particular to an integrated screening device for a rotary drum dryer. Background Technology

[0002] The rotary drum dryer is a core piece of equipment in the potassium magnesium sulfate fertilizer production system. Its main function is to feed wet potassium magnesium sulfate fertilizer material into the dryer via a belt conveyor and an inclined feeding pipe. The dryer drum is a rotating cylinder slightly inclined to the horizontal. The wet material is fed from the higher end and moves forward as the dryer rotates. Hot air from the combustion furnace heats the material, drying it. After drying, the material is discharged from the discharge port and conveyed to the packaging machine by a belt conveyor. Lifting plates are installed on the inner wall of the drum to raise the wet material, increasing the contact surface between the material and the flowing hot air, thereby improving the drying rate and promoting material movement.

[0003] The existing rotary dryer has a self-made screening device installed at the bottom of the tail section. However, in the actual production process of potassium magnesium sulfate fertilizer, the screening efficiency is low due to the material characteristics and the limited space, resulting in high powder content, low grade, and low production capacity, which seriously affects the output and quality of the finished product. Therefore, designing a high-efficiency screening device for the rotary dryer is an important means to ensure the continuous production of potassium magnesium sulfate fertilizer. Utility Model Content

[0004] The purpose of this invention is to provide an integrated screening device for a rotary dryer, which aims to solve the problem in the prior art where the material is mismatched with the rotary dryer and screening device, resulting in fluctuations in product output and quality.

[0005] To achieve the above objectives, this utility model provides the following solution: This utility model provides an integrated screening device for a rotary drum dryer, comprising: A cylindrical screen has a cylindrical structure and is coaxially arranged with the cylinder of the dryer. One end of the screen has a feed inlet and is detachably connected to the tail end of the dryer cylinder. The other end extends away from the dryer and has a discharge outlet. The outer peripheral wall of the cylindrical screen has an array of screen holes.

[0006] Optionally, the cylindrical screen includes: A frame, which is detachably connected to the tail end of the dryer's cylinder; Multiple screen units, each with an arc-shaped plate structure and an array of screen holes, are provided. Each screen unit can be detached and installed on the frame, and they are sequentially spliced ​​together along the circumference of the dryer cylinder to form a cylindrical structure.

[0007] Optionally, the screen unit includes: A sieve structure, the array of which is provided with sieve holes; A support frame surrounds the outer perimeter of the screen structure and is detachably connected to the frame.

[0008] Optionally, the screen structure is provided with reinforcing strips, which are located at the middle position of the screen structure along the axial direction of the dryer cylinder and extend circumferentially along the dryer cylinder. Both ends of the reinforcing strips are connected to the corresponding positions of the supporting frame.

[0009] Optionally, the frame is provided with multiple support bars, each of which is distributed sequentially along the circumference of the dryer cylinder and extends along the axis of the dryer cylinder. Each support bar is detachably connected to the corresponding screen unit.

[0010] Optionally, the support bar is provided with a plurality of connecting components, each of which is arranged sequentially along the direction of extension of the support bar and is connected to the corresponding screen unit.

[0011] Optionally, the connection component includes: An outer pressure plate abuts against the outer peripheral wall of the screen unit; An inner pressure plate abuts against the inner peripheral wall of the screen unit; A preload element is installed on the support bar and presses against the outer pressure plate and the inner pressure plate.

[0012] Optionally, the edges of two adjacent screen units after splicing are pressed between the corresponding outer pressure plate and the inner pressure plate.

[0013] Optionally, the frame is connected to the tail end of the dryer cylinder via a flange.

[0014] Optionally, the discharge port is connected to a return conveyor, which is used to transport materials to the front end of the production equipment; The bottom of the sieve holes is equipped with a packaging conveyor for receiving the falling material, and the packaging conveyor is used to transport the material to the packaging equipment.

[0015] The present invention achieves the following technical advantages over the prior art: The integrated drying and screening device disclosed in this utility model allows wet material to enter the drum through the dryer head. Through the rotation of the dryer drum, the tumbling of the internal lifting plates, and the action of the guide plates, the material is gradually dried and conveyed to the tail end of the dryer. At the tail end, it falls into the cylindrical screen for screening by rotation. Unqualified large particles and unqualified powder are screened and discharged from the outlet, while qualified material is screened and discharged through the screen holes. This utility model optimizes and improves the screening of dry material discharged from the dryer by installing a cylindrical screen, overcoming the shortcomings of existing devices. By installing a cylindrical screen at the tail end of the dryer, the original dryer-screening device mode is changed to an integrated drying and screening device, ensuring that the dried material is evenly discharged after passing through the cylindrical screen, avoiding material blockage, improving screening quality and efficiency, ensuring stable and continuous production, and contributing to improving the production capacity and quality of potassium magnesium fertilizer products, ensuring process stability. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram showing the connection between the integrated screening device and the rotary dryer in one example of the present invention. Figure 2 This is a radial cross-sectional view of an integrated screening device for a rotary drum dryer, as disclosed in this utility model. Figure 3 for Figure 1 Enlarged view of point A in the middle; Figure 4 for Figure 2 Enlarged view at point B in the middle; Figure 5 This is a schematic diagram of the unfolded screen unit in one example disclosed in this utility model; Among them, 1-cylinder, 2-sealed box, 3-cylindrical screen, 4-frame, 5-screen unit, 6-flange structure, 7-screw, 8-support strip, 9-outer pressure plate, 10-inner pressure plate, 11-angle steel, 12-support frame, 13-reinforcing strip. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] The purpose of this invention is to provide an integrated screening device for a rotary dryer, which aims to solve the problem in the prior art where the material is mismatched with the rotary dryer and screening device, resulting in fluctuations in product output and quality.

[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figures 1 to 5 As shown, this utility model provides an integrated screening device for a rotary dryer, including a cylindrical screen 3. The cylindrical screen 3 has a cylindrical structure and is coaxially arranged with the dryer body 1. One end of the screen has a feed inlet and is detachably connected to the tail end of the dryer body 1. The other end extends away from the dryer and has a discharge outlet. The outer peripheral wall of the cylindrical screen 3 is arrayed with screen holes. In use, the wet material enters the dryer body 1 through the dryer head. Through the rotation of the dryer body 1, the tumbling of the internal lifting plates, and the action of the guide plates, the material is gradually dried and conveyed to the tail end of the dryer. At the tail end, it falls into the cylindrical screen 3 for screening by rotation. Unqualified large particles and unqualified powder are screened and discharged from the discharge outlet, while qualified materials are screened and discharged through the screen holes. This invention optimizes and improves the screening of dry materials discharged from the dryer by setting up a cylindrical screen 3, overcoming the shortcomings of existing devices. By installing a cylindrical screen 3 at the tail end of the dryer, the original dryer-screening device mode is changed to an integrated drying and screening device, so that the dried material is evenly discharged after passing through the cylindrical screen 3, avoiding material blockage, improving screening quality and efficiency, ensuring stable and continuous production, helping to improve the production capacity and quality of potassium magnesium fertilizer products, and ensuring process stability.

[0022] In this embodiment, the cylindrical screen 3 is installed inside the sealed box 2 at the tail end of the dryer, so that the material discharged from the tail end of the dryer cylinder 1 is screened and separated within the sealed box 2. The bottom wall of the sealed box 2 has a first receiving port and a second receiving port at positions corresponding to the cylindrical screen 3. The first receiving port corresponds to the outer peripheral wall of the cylindrical screen 3 and is used to receive the material screened through the screen holes. The second receiving port corresponds to the discharge port of the cylindrical screen 3 and is used to receive the material discharged from the discharge port. To avoid interference between the screened material and the discharged material, a baffle is preferably provided between the first and second receiving ports, extending to the outer peripheral wall of the cylindrical screen 3 to separate the screen holes and the discharge port.

[0023] Furthermore, the first receiving port is connected to the first conveying channel, through which the material screened by the sieve holes is conveyed to the packaging conveyor. The packaging conveyor is used to convey the material to the packaging equipment for packaging and storage. The second receiving port is connected to the second conveying channel, through which the material discharged from the discharge port is conveyed to the return conveyor. The return conveyor is then conveyed to the front end of the production equipment for reprocessing until it is qualified, thereby improving the utilization rate of the material.

[0024] In this embodiment, a guide plate is provided at the connection between the inner wall of the dryer cylinder 1 and the feed inlet of the cylindrical screen 3.

[0025] In this embodiment, when applied to an improvement example of an existing dryer, it is necessary to cut off the tail end of the dryer cylinder 1 inside the sealed box 2, and then place the cylindrical screen 3 inside the sealed box 2 and connect it to the remaining part of the tail end of the dryer cylinder 1.

[0026] In one specific embodiment, the cylindrical screen 3 includes a frame 4 and multiple screen units 5. The frame 4 is detachably connected to the tail end of the dryer cylinder 1. Each screen unit 5 has an arc-shaped plate structure and is arrayed with screen holes. Each screen unit 5 is detachably mounted on the frame 4 and sequentially assembled into a cylindrical structure along the circumference of the dryer cylinder 1. The frame 4 is used to improve the structural strength of the entire cylindrical screen 3, and multiple screen structures are sequentially connected to the frame 4 to facilitate the manufacturing and installation of the entire cylindrical screen 3. The frame 4 uses a perforated stainless steel or iron frame structure to prevent material from being obstructed when discharging through the screen units 5.

[0027] In this embodiment, the screen unit 5 includes a screen structure and a support frame 12. The screen structure array has screen holes, the size of which is determined according to the material to be screened. The support frame 12 is connected around the outer periphery of the screen structure and is detachably connected to the frame 4. The support frame 12 is fixed to the outer periphery of the screen structure to enhance the strength of the entire screen structure and improve its flatness, preventing the screen structure from easily deforming during use. The support frame 12 is also connected to the frame 4 to ensure the connection strength between the entire screen unit 5 and the frame 4, preventing the screen holes on the screen structure from affecting the connection with the frame 4.

[0028] The supporting frame 12 is made of flat iron with a strip structure, which is connected to the outer perimeter of the screen structure by welding or other methods. The screen structure is made of stainless steel mesh. In the process of making the cylindrical screen 3, the screen unit 5 needs to be made into an arc-shaped plate structure, and the flat iron and screen structure can be bent to the required curvature according to the manufacturing tools.

[0029] In one specific embodiment, the screen structure is provided with reinforcing strips 13. The reinforcing strips 13 are located in the middle of the screen structure along the axial direction of the dryer cylinder 1 and extend circumferentially along the dryer cylinder 1. Both ends of the reinforcing strips 13 are connected to the corresponding positions of the supporting frame 12. By providing reinforcing strips 13, the structural strength of the entire screen structure is further improved, and deformation is prevented during use.

[0030] Among them, the reinforcing strip 13 is made of flat iron with a strip structure. It is connected to the middle part of the screen structure by welding or other means. Alternatively, during the manufacturing process, the reinforcing strip 13 is first welded to the middle part of the supporting frame 12, so that the supporting frame 12 is divided into two parts. The screen structure is set in the two parts respectively and connected to the supporting frame 12 and the reinforcing strip 13 at the corresponding positions.

[0031] In one specific embodiment, the frame 4 is provided with multiple support bars 8, each support bar 8 is distributed sequentially along the circumference of the dryer cylinder 1 and extends along the axis of the dryer cylinder 1. Each support bar 8 is detachably connected to the corresponding screen unit 5, so that each support bar 8 forms a structural support for the screen unit 5, maintains the cylindrical structure of the entire cylindrical screen 3, improves the uniform screening of materials during rotation, and ensures the screening effect.

[0032] In this embodiment, the support bar 8 is preferably made of channel steel, so as to improve the strength of the entire cylindrical screen 3 by utilizing the structure of the channel steel.

[0033] In one specific embodiment, the support bar 8 is provided with multiple connecting components, each of which is arranged sequentially along the direction of extension of the support bar 8 and is connected to the corresponding screen unit 5 to ensure the connection strength of the screen unit 5.

[0034] In this embodiment, the connecting assembly includes an outer pressure plate 9, an inner pressure plate 10, and a pre-tightening member. The outer pressure plate 9 abuts against the outer peripheral wall of the screen unit 5; the inner pressure plate 10 abuts against the inner peripheral wall of the screen unit 5; the pre-tightening member is installed on the support bar 8 and presses the outer pressure plate 9 and the inner pressure plate 10 together. The support bar 8 is used as the core load-bearing component, and after being connected to the support bar 8 by the pre-tightening member, a pre-tightening force is applied to the outer pressure plate 9 and the inner pressure plate 10, so that the outer pressure plate 9 and the inner pressure plate 10 press the corresponding screen unit 5 together. This ensures that the structural integrity of the screen unit 5 is not damaged, and that the screen unit 5 can be detachably connected.

[0035] Among them, the edges of two adjacent screen units 5 after splicing are pressed between the corresponding outer pressure plate 9 and inner pressure plate 10 so that the screen units 5 can be spliced ​​together to form a cylindrical structure.

[0036] In this embodiment, the preload is preferably a bolt assembly, which includes a screw 7 that passes sequentially through the support bar 8, the outer pressure plate 9, the screen unit 5, and the inner pressure plate 10. The screw 7 has a nut and a bolt at both ends, or both ends have nuts, to abut against the support bar 8 and the inner pressure plate 10 respectively. The screw 7 is threadedly connected to the nut to achieve a clamping effect on the support bar, the outer pressure plate 9, the screen unit 5, and the inner pressure plate 10. Preferably, the inner sidewall of the inner pressure plate 10 abuts against an angle steel 11. Pressure is applied to the angle steel 11 by the nut or bolt to press the angle steel 11 tightly against the inner pressure plate 10, preventing damage to the inner pressure plate 10 under applied force.

[0037] In the example where the screen unit 5 includes a screen structure and a support frame 12, preferably, the support frame 12 has through holes through which the screw 7 passes, and the edges of the support frames 12 of two adjacent screen units 5 overlap, so that the through holes on the two support frames 12 are set one-to-one, thereby allowing the screw 7 to pass through the through holes on the two support frames 12 in sequence to complete the connection of the two adjacent screen units 5.

[0038] Alternatively, in another embodiment, two sets of bolt assemblies are provided along the circumference of the cylindrical screen 3 between the same set of outer pressure plates 9 and inner pressure plates 10, and one side edge of the support frame 12 of two adjacent screen units 5 is connected to each other, and the screws 7 of the two bolt assemblies pass through the through holes of the two support frame 12 respectively.

[0039] In one specific embodiment, the frame 4 is connected to the tail end of the dryer cylinder 1 via a flange. Specifically, the frame 4 is coaxially provided with a flange structure 6 at the position corresponding to the feed inlet of the cylindrical screen 3, and another flange structure 6 is coaxially provided at the tail end of the dryer cylinder 1. The two flange structures 6 are connected by bolts, and a sealing ring is provided between the two flange structures 6. In the example where the frame 4 includes multiple support bars 8, one end of each support bar 8 is connected to one side end face of the corresponding flange structure 6 and is evenly distributed along the circumference; the other end of each support bar 8 is connected to an annular reinforcing ring to ensure effective support for each support bar 8.

[0040] In one specific embodiment, the discharge port is connected to a return conveyor, which is used to transport materials to the front end of the production equipment. After screening out unqualified large particles and unqualified powders, the materials are discharged from the discharge port and transported to the front end of the production equipment for reprocessing until they are qualified, thereby improving the utilization rate of materials. The bottom of the screen holes is equipped with a packaging conveyor for receiving the falling materials. The packaging conveyor is used to transport the materials to the packaging equipment for packaging and storage.

[0041] Any adaptive changes made according to actual needs are within the protection scope of this utility model.

[0042] It should be noted that, for those skilled in the art, it is obvious that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0043] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. An integrated screening device for a rotary drum dryer, characterized in that, include: A cylindrical screen has a cylindrical structure and is coaxially arranged with the cylinder of the dryer. One end of the screen has a feed inlet and is detachably connected to the tail end of the dryer cylinder. The other end extends away from the dryer and has a discharge outlet. The outer peripheral wall of the cylindrical screen has an array of screen holes.

2. The integrated screening device for the rotary dryer according to claim 1, characterized in that, The cylindrical screen includes: A frame, which is detachably connected to the tail end of the dryer's cylinder; Multiple screen units, each with an arc-shaped plate structure and an array of screen holes, are provided. Each screen unit can be detached and installed on the frame, and they are sequentially spliced ​​together along the circumference of the dryer cylinder to form a cylindrical structure.

3. The integrated screening device for the rotary dryer according to claim 2, characterized in that, The screen unit includes: A sieve structure, the array of which is provided with sieve holes; A support frame surrounds the outer perimeter of the screen structure and is detachably connected to the frame.

4. The integrated screening device for the rotary drum dryer according to claim 3, characterized in that, The screen structure is provided with reinforcing strips. The reinforcing strips are located at the middle position of the screen structure along the axial direction of the dryer cylinder and extend circumferentially along the dryer cylinder. Both ends of the reinforcing strips are connected to the corresponding positions of the supporting frame.

5. The integrated screening device for the rotary dryer according to claim 2, characterized in that, The frame is provided with multiple support bars, each of which is distributed sequentially along the circumference of the dryer cylinder and extends along the axis of the dryer cylinder. Each support bar is detachably connected to the corresponding screen unit.

6. The integrated screening device for the rotary dryer according to claim 5, characterized in that, The support bar is provided with multiple connecting components, each of which is arranged sequentially along the direction of extension of the support bar and is connected to the corresponding screen unit.

7. The integrated screening device for the rotary dryer according to claim 6, characterized in that, The connection component includes: An outer pressure plate abuts against the outer peripheral wall of the screen unit; An inner pressure plate abuts against the inner peripheral wall of the screen unit; A preload element is installed on the support bar and presses against the outer pressure plate and the inner pressure plate.

8. The integrated screening device for the rotary dryer according to claim 7, characterized in that, The edges of the two adjacent screen units after splicing are pressed between the corresponding outer pressure plate and the inner pressure plate.

9. The integrated screening device for the rotary dryer according to claim 2, characterized in that, The frame is connected to the tail end of the dryer cylinder via a flange.

10. The integrated screening device for the rotary dryer according to claim 1, characterized in that, The discharge port is connected to a return conveyor, which is used to transport materials to the front end of the production equipment; The bottom of the sieve holes is equipped with a packaging conveyor for receiving the falling material, and the packaging conveyor is used to transport the material to the packaging equipment.

Images