Breakage-proof multi-return path dryer

Abstract

The utility model relates to drying equipment technical field discloses a kind of anti-breakage multi-return drying machine, including outer tube and the end plate of fixed connection in the both ends of outer tube, the inside of outer tube is successively coaxially sleeved with inner core cylinder, inner cylinder two and inner cylinder one from inside to outside, the outer wall between inner core cylinder and the inner wall of inner cylinder two is fixedly connected by multiple fixed plate three, the outer wall between inner cylinder two and the inner wall of inner cylinder one is fixedly connected by multiple fixed plate two.The utility model limits the drop height of material in smaller interlamellar spacing range by multilayer sleeve structure, significantly reduces the fall impact when material tumbles in cylinder, effectively prevents fragile material breakage, and simultaneously multi-return structure prolongs drying stroke.

Description

Technical Field

[0001] This utility model relates to the field of drying equipment technology, and in particular to a multi-pass dryer that is designed to prevent breakage. Background Technology

[0002] In the industrial production processes of coal, chemical, building materials and biomass energy, dehydration and drying of materials is an essential process. Rotary drum dryers are widely used because of their large processing capacity and simple operation. In particular, for shaped materials such as briquettes, semi-coke and biomass pellets, the integrity of the dried materials is directly related to the commercial value and use effect of the products.

[0003] However, existing traditional single-drum dryers are usually designed with a large drum diameter to meet production requirements and provide sufficient heat exchange space. During operation, the lifting plates on the inner wall of the drum lift the material to the top and near the top of the drum. Then, the material falls freely under gravity and forms a material curtain to exchange heat with the hot airflow. Although this working method is beneficial for heat conduction, it has significant drawbacks for the aforementioned fragile molded materials. That is, when the material falls from a height to the bottom of the drum, it will generate a large impact force, resulting in violent collisions between materials and between materials and the drum wall.

[0004] The high drop height caused by the large diameter cylinder is the main reason for the high breakage rate of fragile materials during the drying process. The breakage of materials not only directly reduces the yield and economic benefits, but also increases the load on subsequent dust removal equipment and pollutes the environment. Although multi-pass dryers have appeared on the market, the existing structural designs mostly focus on solving the problems of thermal efficiency and floor space. There is still a lack of targeted and effective solutions on how to optimize the internal space structure to fundamentally limit the drop height of materials and thus achieve flexible drying and protection against breakage of fragile materials.

[0005] Therefore, this utility model proposes a multi-pass dryer to prevent breakage, in order to overcome the shortcomings of the prior art. Utility Model Content

[0006] In view of the problems in the existing technology, traditional single-drum dryers have large drum diameters, which cause materials to fall from a great height after being lifted during operation, resulting in severe damage to fragile materials due to impact under gravity. In addition, they have low structural space utilization and short drying stroke. The present invention aims to provide a multi-pass dryer with improved structure that can limit the fall height through multiple sleeves to effectively solve the above-mentioned damage problems and extend the drying stroke.

[0007] This utility model provides a multi-pass dryer for preventing breakage, including an outer cylinder and end plates fixedly connected to both ends of the outer cylinder. The outer cylinder serves as the outermost protective structure of the equipment, and the end plates are used to seal the cylinder and provide support. In addition, it also includes a fastening ring, an inner core cylinder, a second inner cylinder, a first inner cylinder, a ventilation baffle, a third fixing plate, a second fixing plate, and a first fixing plate.

[0008] The inner core cylinder, the second inner cylinder, and the first inner cylinder are coaxially sleeved inside the outer cylinder from the inside to the outside, thereby creating a multi-layered nested internal space within a limited external dimension. The fastening ring is sleeved and fixed on the outer wall of the outer cylinder for support and drive. The ventilation baffle is fixedly connected to the air inlet and exhaust ends of the inner core cylinder to control the entry and exit of hot air.

[0009] Furthermore, in order to achieve a stable connection and integrated rotation between the multi-layer cylinders, multiple fixing plates three are fixedly connected between the outer wall of the inner core cylinder and the inner wall of the inner cylinder two, connecting the innermost two cylinders. Multiple fixing plates two are fixedly connected between the outer wall of the inner cylinder two and the inner wall of the inner cylinder one, connecting the middle cylinders. Multiple fixing plates one are fixedly connected between the outer wall of the inner cylinder one and the inner wall of the outer cylinder, connecting the outermost cylinder to the internal structure. Through these progressively advancing fixing plate connection structures, all cylinders form a rigid whole.

[0010] Preferably, in order to guide the material movement in the first pass, a guide plate is fixedly connected to the outer wall of the inner cylinder. The guide plate is spirally distributed between the outer wall of the inner cylinder and the inner wall of the outer cylinder. The guide plate can push the material to flow axially in an orderly manner in the outermost annular channel.

[0011] Preferably, in order to realize the reverse conveying of the second pass, a guide plate two is fixedly connected to the outer wall of the inner cylinder two. The guide plate two is spirally distributed between the outer wall of the inner cylinder two and the inner wall of the inner cylinder one. The spiral direction design of the guide plate two allows the material to move in the reverse direction in the intermediate layer channel, increasing the drying path.

[0012] Preferably, in order to perform the third pass drying in the innermost channel, a guide plate three is fixedly connected to the outer wall of the inner core cylinder. The guide plate three is spirally distributed between the outer wall of the inner core cylinder and the inner wall of the inner cylinder two. The guide plate three guides the material to move in the deepest channel and to fully contact the hot air.

[0013] Preferably, in order to facilitate the smooth discharge of dried material, a discharge guide plate is fixedly connected to the inner wall of the discharge end of the inner cylinder 2. The discharge guide plate is arranged in a spiral shape, which can collect the material located in the inner layer and guide it to the discharge port.

[0014] Preferably, in order to enhance structural stability and optimize the connection effect, the fixing plate three is welded and fixed at equal intervals along the axial direction of the inner core cylinder, and the fixing plate three connects the inner core cylinder and the inner cylinder two into one. This equal-interval welding connection method not only ensures the uniformity of torque transmission, but also plays a certain role in reinforcing ribs.

[0015] Preferably, in order to facilitate the loading and unloading of materials and the installation and positioning of the internal structure, a central through hole is provided in the center of the end plate, and the ends of the inner core cylinder, the second inner cylinder, and the first inner cylinder are all provided corresponding to the central through hole, so that the central channel of the multi-layer cylinder is connected to the outside.

[0016] Preferably, in order to achieve efficient utilization and uniform distribution of hot air, the inner core cylinder has through holes on its side wall that connect the inside and outside. The through holes are used to connect the internal space of the inner core cylinder with the interlayer space between the inner core cylinder and the inner cylinder II. Hot air can diffuse radially into the drying area through these through holes and directly contact the material for heat exchange.

[0017] This utility model has the following beneficial effects: 1. This utility model solves the problem of excessive material tumbling and falling height caused by the large diameter of the cylinder in existing single-cylinder dryers, which easily leads to the breakage of fragile materials, by adopting a multi-layer sleeve structure in which the inner core cylinder, inner cylinder two, inner cylinder one and outer cylinder are coaxially nested from the inside to the outside. It achieves the effect of limiting the height of material falling between layers to a small range of layer spacing, significantly reducing the impact of the drop when the material tumbles in the cylinder, effectively preventing the breakage of fragile materials, and ensuring the integrity and quality of the finished product.

[0018] 2. This utility model solves the problems of short drying stroke and insufficient heat exchange in conventional drying equipment with limited floor space by setting spirally distributed guide plates between each layer of cylinder and forming a multi-layer nested structure to form a folding multi-pass drying channel. It achieves the effect of significantly extending the material movement stroke and drying time, increasing the contact opportunity between the material and hot air, and improving space utilization and heat exchange efficiency without increasing the overall length of the equipment.

[0019] 3. This utility model solves the problems of poor rotational stability and uneven hot air distribution in multi-layer structures by using multiple fixed plates to firmly connect the various layers of cylinders into one unit along the axial or circumferential direction and combining the air intake method of opening through holes in the side wall of the inner core cylinder. It achieves the effects of enhancing the overall rigidity of the equipment, ensuring the synchronous and stable rotation of the multi-layer cylinders, and enabling hot air to penetrate evenly from the center outwards between the layers and fully contact the materials, thereby further improving the drying uniformity and the reliability of equipment operation. Attached Figure Description

[0020] Figure 1This is a perspective view of a multi-pass dryer designed to prevent breakage according to the present invention. Figure 2 This is a perspective view of a multi-pass dryer designed to prevent breakage according to the present invention. Figure 3 This is a cross-sectional view of the outer cylinder of a multi-pass dryer designed to prevent breakage, as proposed in this utility model. Figure 4 This is a cross-sectional view of the inner core cylinder in a multi-pass dryer designed to prevent breakage, as proposed in this utility model. Figure 5 This is a cross-sectional view of the inner cylinder 2 in a multi-pass dryer designed to prevent breakage according to this utility model.

[0021] Legend: 1. Outer cylinder; 2. Fixing plate one; 3. Guide plate one; 4. Inner cylinder one; 5. Fixing plate two; 6. Guide plate two; 7. Inner cylinder two; 8. Fixing plate three; 9. Guide plate three; 10. Inner core cylinder; 11. Ventilation baffle; 12. Discharge guide plate; 13. End plate; 14. Fastening ring. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0023] Example: Please refer to Figures 1 to 5 This utility model provides a multi-pass dryer designed to prevent breakage, which aims to solve the structural defects of existing single-drum dryers where the large diameter of the drum causes materials to tumble and fall too high, making fragile materials prone to breakage.

[0024] like Figures 1 to 5 As shown, the anti-breakage multi-pass dryer includes an outer cylinder 1 and end plates 13 fixedly connected to both ends of the outer cylinder 1. The outer cylinder 1 serves as the outer protective and load-bearing body of the entire device, used to accommodate the internal multi-layer structure and prevent heat loss. The end plates 13 are used to seal both ends of the cylinder and provide a foundation for feeding and structural support. A fastening ring 14 is fitted and fixed on the outer wall of the outer cylinder 1. The fastening ring 14 is used to provide radial support for the cylinder and as a driving component to cooperate with the external driving device to drive the entire dryer cylinder to rotate around the axis.

[0025] Inside the outer cylinder 1, from the inside out, the inner core cylinder 10, the second inner cylinder 7, and the first inner cylinder 4 are coaxially arranged. The inner core cylinder 10, the second inner cylinder 7, and the first inner cylinder 4 together form a multi-layer sleeve structure, which divides the huge internal space into multiple annular channels with small interlayer spacing. This structure can significantly reduce the drop height of the material during the drying process to achieve the function of preventing breakage. At the same time, it can extend the movement of the material in the machine and the drying time. The air inlet and outlet ends of the inner core cylinder 10 are fixedly connected to the ventilation baffles 11. The ventilation baffles 11 are used to introduce hot air and guide the hot air into specific interlayer channels to exchange heat with the material.

[0026] To address the technical problem of material breakage caused by the aforementioned single-drum dryer, the core of the technical solution in this embodiment lies in the fact that the anti-breakage multi-pass dryer forms a stable multi-pass structure through the nesting and fixed connection of multiple layers of cylinders. Each layer of cylinder is connected as a whole by specific fixing components. Specifically, multiple fixing plates 8 are welded and fixed at equal intervals along the axial direction between the outer wall of the inner core cylinder 10 and the inner wall of the inner cylinder 7. The fixing plates 8 not only serve to connect and support the inner core cylinder 10 and the inner cylinder 7, firmly connecting the inner core cylinder 10 and the inner cylinder 7 as a whole to ensure synchronous rotation, but also divide the annular space between the inner core cylinder 10 and the inner cylinder 7 into multiple areas to increase structural rigidity.

[0027] Please refer to Figures 3 to 5 The connection structure between each layer of cylinder is described in detail below. Multiple fixing plates 2 5 are fixedly connected between the outer wall of inner cylinder 2 7 and the inner wall of inner cylinder 1 4. The fixing plates 2 5 are evenly distributed circumferentially or spaced apart axially to securely connect inner cylinder 2 7 and inner cylinder 1 4, ensuring their coaxiality and synchronization during rotation and preventing cylinder deformation due to uneven force. Multiple fixing plates 1 2 are connected between the outer wall of inner cylinder 1 4 and the inner wall of outer cylinder 1. The fixing plates 1 2 also serve as supports and transmission. The outermost outer cylinder 1 and the innermost inner cylinder 1 4 are tightly connected by the fixing plates 1 2, so that the four main cylinder components, outer cylinder 1, inner cylinder 1 4, inner cylinder 2 7 and inner core cylinder 10, are connected by progressively advancing fixing plates to form a rigid integral rotating component.

[0028] Meanwhile, in order to achieve orderly flow and efficient heat exchange of materials in the multi-layer annular channel, each layer of the cylinder is equipped with a specially designed flow guiding structure. The flow guiding plate 39 is spirally welded and fixed to the outer wall of the inner core cylinder 10. The flow guiding plate 39 is located in the channel formed between the inner core cylinder 10 and the inner cylinder 27. The spiral direction is set so that it can push the material to move directionally along the axial direction. The flow guiding plate 26 is spirally fixed to the outer wall of the inner cylinder 27. The flow guiding plate 26 is located in the channel formed between the inner cylinder 27 and the inner cylinder 14. The spiral guide is opposite to the material movement direction in the adjacent layer channel to achieve reciprocating flow. The flow guiding plate 13 is spirally fixed to the outer wall of the inner cylinder 14. The flow guiding plate 13 is located in the channel formed between the inner cylinder 14 and the outer cylinder 1 and is used to guide the material movement in the first reciprocating flow.

[0029] For the final discharge of materials, the discharge guide plate 12 is fixedly connected to the inner wall of the discharge end of the inner cylinder 7 in a spiral shape. The spiral angle and position of the discharge guide plate 12 are designed to effectively collect and guide the materials that have reached the inner depth after multiple return drying cycles to the discharge port. This progressive spiral guide structure, combined with the multi-layer sleeve design, ensures that the materials can be dried over a long distance in the machine according to the predetermined multi-return path, and the drop height throughout the process is limited to the interlayer spacing, which greatly reduces the breakage rate.

[0030] In a preferred embodiment, in order to achieve uniform distribution and efficient utilization of hot air inside the dryer, through holes are provided on the side wall of the inner core cylinder 10 to connect the inside and outside. The number and diameter of the through holes are calculated and arranged so that the hot air entering the inner core cylinder 10 can evenly diffuse through the cylinder wall of the inner core cylinder 10 to the interlayer space between the inner core cylinder 10 and the inner cylinder 2 7. Then, the hot air continues to diffuse to the outer layer or flow along the interlayer channel under the action of pressure difference, thereby achieving full contact and heat exchange between the hot air and the material.

[0031] As another preferred embodiment, in order to facilitate the overall installation of the multi-layer cylinder structure and the entry and exit of materials, a central through hole is provided in the center of the end plate 13. The ends of the inner core cylinder 10, the second inner cylinder 7 and the first inner cylinder 4 are all coaxially corresponding to the central through hole. This coaxial corresponding design allows the material to smoothly pass through the end plate 13 into the channel between the outer cylinder 1 and the first inner cylinder 4. It also facilitates the connection of hot air pipes or discharge devices from the center into the equipment.

[0032] As a further preferred embodiment, in order to enhance the stability of the connection structure between the inner core cylinder 10 and the inner cylinder 2 7 and optimize the flow field, the fixing plate 3 8 is welded and fixed at equal intervals along the axial direction of the inner core cylinder 10. This equally spaced distribution design can not only evenly distribute the torque transmission between the inner core cylinder 10 and the inner cylinder 2 7 and prevent local stress concentration, but also the regularly arranged fixing plate 3 8 can play a turbulence role to a certain extent, increase the turbulence of hot air in the interlayer channel, and thus improve the heat exchange efficiency.

[0033] Working principle: When in use, the external drive device drives the entire cylinder to rotate around the axis through the fastening ring 14. The wet material enters the device from the feed port on the end plate 13. Under the pushing action of gravity and the guide plate 3, the material moves to one end along the annular channel between the outer cylinder 1 and the inner cylinder 4 and performs the first return drying. When the material reaches the end of the first pass, it naturally falls into the channel between inner cylinder 4 and inner cylinder 7. Under the guidance of guide plate 6, the material changes its direction of movement and moves in the opposite direction along the channel between inner cylinder 4 and inner cylinder 7 for the second pass drying. Subsequently, the material enters the innermost channel between the inner cylinder 2 7 and the inner core cylinder 10. Under the action of the guide plate 3 9, the material changes direction again and undergoes the third round of drying. During this process, hot air enters through the ventilation baffle 11 in the center of the inner core cylinder 10, passes through the through holes on the wall of the inner core cylinder 10 and enters each layer of channels. The hot air flows back and forth between each layer and fully contacts the material to exchange heat. Because of the multi-layer sleeve structure of inner core cylinder 10, inner cylinder two 7, inner cylinder one 4 and outer cylinder 1, the height of the material falling between the layers is only the distance between the two cylinder walls. This small falling height significantly reduces the impact of the drop when the material rolls in the cylinder, thus effectively preventing the breakage of fragile materials. After drying, the material is finally guided out through the discharge guide plate 12.

Claims

1. A breakage-resistant multi-pass dryer, comprising an outer cylinder (1) and end plates (13) fixedly connected to both ends of the outer cylinder (1); Its features are, Also includes: Inner core cylinder (10), inner cylinder two (7) and inner cylinder one (4), the inner core cylinder (10), the inner cylinder two (7) and the inner cylinder one (4) are coaxially sleeved inside the outer cylinder (1) from the inside to the outside; Ventilation baffle (11), the ventilation baffle (11) is fixedly connected to the air inlet end and the air outlet end of the inner core cylinder (10); Multiple fixing plates three (8) are fixedly connected between the outer wall of the inner core cylinder (10) and the inner wall of the inner cylinder two (7); Multiple fixing plates (5) are fixedly connected between the outer wall of the inner cylinder (7) and the inner wall of the inner cylinder (4); Multiple fixing plates (2) are fixedly connected between the outer wall of the inner cylinder (4) and the inner wall of the outer cylinder (1); Fastening ring (14) is sleeved and fixed on the outer wall of the outer cylinder (1).

2. The anti-breakage multi-pass dryer according to claim 1, characterized in that, A guide plate (3) is fixedly connected to the outer wall of the inner cylinder (4). The guide plate (3) is spirally distributed between the outer wall of the inner cylinder (4) and the inner wall of the outer cylinder (1).

3. The anti-breakage multi-pass dryer according to claim 1, characterized in that, A guide plate 2 (6) is fixedly connected to the outer wall of the inner cylinder 2 (7). The guide plate 2 (6) is spirally distributed between the outer wall of the inner cylinder 2 (7) and the inner wall of the inner cylinder 1 (4).

4. The anti-breakage multi-pass dryer according to claim 1, characterized in that, A guide plate three (9) is fixedly connected to the outer wall of the inner core cylinder (10). The guide plate three (9) is spirally distributed between the outer wall of the inner core cylinder (10) and the inner wall of the inner cylinder two (7).

5. A multi-pass anti-breakage dryer according to claim 1, characterized in that, A discharge guide plate (12) is fixedly connected to the inner wall of the discharge end of the inner cylinder 2 (7), and the discharge guide plate (12) is arranged in a spiral shape.

6. The anti-breakage multi-pass dryer according to claim 1, characterized in that, The fixing plate three (8) is welded and fixed along the axial direction of the inner core cylinder (10), and the fixing plate three (8) connects the inner core cylinder (10) and the inner cylinder two (7) into one unit.

7. A multi-pass anti-breakage dryer according to claim 1, characterized in that, The end plate (13) has a central through hole, and the ends of the inner core cylinder (10), the second inner cylinder (7) and the first inner cylinder (4) are all provided corresponding to the central through hole.

8. A multi-pass anti-breakage dryer according to claim 1, characterized in that, The inner core cylinder (10) has a through hole on its side wall, which connects the interior of the inner core cylinder (10) with the interlayer channel outside the inner core cylinder (10).

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