Indirect drying device and drying method for wet materials

Abstract

The wet material indirect drying device comprises a drying inner barrel, a main shaft axially penetrating through the drying inner barrel, a motor used for driving the main shaft to rotate, a drying outer box fixed to the outer side of the drying inner barrel, and a bottom plate fixedly connected with the bottom of the drying outer box. The stirring part is rotationally connected in the radial direction of the main shaft, the reciprocating mechanism is used for driving the main shaft to do reciprocating motion in the axial direction when the main shaft rotates, and the stirring part is driven by the reciprocating mechanism to swing. According to the invention, materials remaining between the stirring parts can be effectively crushed. And the surface area can be increased, so that water can be evaporated more quickly, and the drying efficiency is remarkably improved. And secondly, the stirring part irregularly swings during rotation, so that hardened materials can be effectively loosened again, large material blocks are prevented from being formed in the drying process, and the uniformity of the drying process is ensured. On one hand, the drying rate of the materials is increased, and on the other hand, the product quality problem caused by uneven materials is also reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of drying devices, and in particular to a wet material indirect drying device and a drying method. Background Art

[0002] At present, the indirect dryer is a conduction dryer that uses high-temperature hot flue gas as a heat medium. Since the residual flue gas is used, there is no need to prepare additional fuel. It is suitable for semi-drying or fully drying various wet materials, and for preliminary treatment of wet materials.

[0003] The main body of the dryer consists of a cylindrical drying inner cylinder and a square drying outer box. The drying inner cylinder runs through the drying outer box and is wrapped by a heating chamber. A small part of the drying inner cylinder is exposed at both ends of the drying outer box. A feed port is provided at one end of the drying inner cylinder, and a discharge port is provided at the other end. The drying inner cylinder and the drying outer box are not connected. An air inlet for entering the heat source gas is provided at one end of the drying outer box, and an air outlet is provided at the other end. The heat source gas flows through the drying outer box, and indirectly transmits the heat to the wet material in the drying inner cylinder through the cylindrical wall of the drying inner cylinder. A main shaft is provided inside the drying inner cylinder, and a number of stirring parts are installed on the outside of the main shaft. The driving device drives the main shaft to rotate. The wet material enters from the feed port and is crushed into small particles by the high-speed rotating stirring part, and receives the heat transferred from the inner wall of the drying inner cylinder for drying. The small particles of wet material after crushing have an increased material specific surface area and an increased contact area with the inner wall of the drying inner cylinder, which is more conducive to efficient heat absorption.

[0004] There are two problems with the current indirect drying device. The first problem is that due to the intervals between the stirring parts, the wet material is easily retained on the inner wall of the drying inner cylinder between the stirring parts during drying, thus affecting the drying effect. The second problem is that the wet material input is prone to compaction and poor fluidity after drying to a certain extent, which requires more drying time and results in poor drying effect. Summary of the invention

[0005] The present invention aims to solve the problems existing in the above-mentioned prior art and provides an indirect drying device for wet materials, which can drive the stirring part to move axially when the main shaft rotates, so as to crush the materials remaining between the stirring parts, and the stirring part can also swing irregularly when rotating, so as to break up the compacted materials and improve the drying efficiency.

[0006] The present invention solves the technical problem by adopting a technical solution: the wet material indirect drying device comprises a drying inner cylinder, a main shaft axially passing through the drying inner cylinder, a motor for driving the main shaft to rotate, a drying outer box fixed to the outside of the drying inner cylinder, a bottom plate fixedly connected to the bottom of the drying outer box, a stirring part rotatably connected to the radial direction of the main shaft, and a reciprocating mechanism for driving the main shaft to reciprocate in the axial direction when the main shaft rotates, and the stirring part swings under the drive of the reciprocating mechanism.

[0007] For further improvement, the reciprocating mechanism includes a pair of support plates fixed on the base plate and passed through by the main shaft, a reciprocating push plate fixed on the outside of the main shaft, a plurality of semicircular protrusions fixed on the reciprocating push plate in a circular array with the main shaft as the center, a semicircular groove provided on one of the support plates and cooperating with the semicircular protrusion, a sleeve splined with the main shaft and fixed to the output shaft of the motor, and a spring installed in the sleeve and capable of pressing the semicircular protrusion on the support plate into the semicircular groove by pushing the main shaft.

[0008] To be further improved, a radially penetrating mounting groove is opened inside the main shaft, the stirring part includes a mounting block arranged in the mounting groove and extending out of the mounting groove at both ends, a rotating pin fixedly connected to the mounting block and rotatably connected to the main shaft, and a stirring column fixed at both ends of the mounting block.

[0009] Further improvement, the stirring part can be extended when the main shaft rotates.

[0010] To further improve the stirring column, a telescopic slot is provided, an extension rod is slidably connected inside the telescopic slot, a reset spring fixedly connected to the extension rod is installed inside the telescopic slot, the extension rod extends out of the telescopic slot by inertia when the main shaft rotates, and the extension rod is retracted into the telescopic slot by the reset spring when the main shaft stops rotating.

[0011] For further improvement, a feed inlet is arranged at the top of the drying inner cylinder, and a discharge outlet is arranged at the bottom of the drying inner cylinder.

[0012] For further improvement, an air inlet is provided at the bottom of the drying outer box to facilitate the rise of the heat source gas, and an air outlet is provided at the top of the drying outer box to facilitate the discharge of the heat source gas.

[0013] Further improvement, the thermal conductivity of the material used in the portion of the drying inner cylinder covered by the drying outer box is higher than the thermal conductivity of the material used in the portion of the drying inner cylinder not covered by the drying outer box.

[0014] For further improvement, the drying outer box is made of heat-insulating material.

[0015] A method for drying wet materials, the steps are as follows: Step 1: First, the wet material is put into the inner cylinder of the drying cylinder through the feed port, and then the heat source gas is passed into the inner cylinder of the drying outer box from the air inlet to heat the inner cylinder of the drying cylinder, and the heat source gas rises and is discharged through the air outlet; Step 2: Start the motor, the output shaft of the motor drives the sleeve to rotate, the sleeve drives the main shaft to rotate, the main shaft rotation drives the stirring column and the reciprocating push plate to rotate, the reciprocating push plate rotation drives a number of semicircular protrusions to continuously enter and exit the semicircular groove, so that the main shaft reciprocates in the axial direction, the reciprocating motion of the main shaft drives the stirring column to reciprocate and swing in the installation groove at the same time, so as to stir the wet material in a larger range, so that the wet material is fully in contact with the heat source gas for drying; Step 3: The stirring column generates inertia when rotating, and the extension rod is extended out of the telescopic slot. When the stirring column stops rotating, the extension rod is retracted into the telescopic slot. The extension rod is frequently extended and retracted by intermittently starting and stopping the motor to better stir and shovel the wet material. The extension length of the extension rod can be controlled by controlling the speed of the motor. Step 4: The wet material is dried in the drying inner cylinder and then discharged and collected through the discharge port.

[0016] The beneficial effects of the present invention are as follows: the present invention can effectively crush the materials remaining between the stirring parts. The surface area can be increased, so that the water can evaporate faster, thereby significantly improving the drying efficiency. Secondly, the irregular swing of the stirring part during rotation can effectively loosen the compacted materials, avoiding the formation of large material lumps during the drying process, thereby ensuring the uniformity of the drying process. This not only improves the drying rate of the material, but also reduces the product quality problems caused by uneven materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 for Figure 1 A magnified view of part A; Figure 3 It is an axonometric view of the stirring part in the present invention; Figure 4 It is an axonometric cross-sectional view of the stirring portion of the present invention; Figure 5 It is a schematic diagram of the structure of the sleeve in the present invention.

[0018] Explanation of the accompanying drawings: drying inner cylinder 1, feed port 1a, discharge port 1b, main shaft 2, mounting groove 2a, motor 3, drying outer box 4, air inlet 4a, air outlet 4b, bottom plate 5, stirring part 6, mounting block 6-1, rotating pin 6-2, stirring column 6-3, telescopic groove 6-4, extension rod 6-5, reset spring 6-6, reciprocating mechanism 7, support plate 7-1, reciprocating push plate 7-2, semicircular protrusion 7-3, semicircular groove 7-4, sleeve 7-5, spring 7-6. DETAILED DESCRIPTION

[0019] The following provides a preferred specific implementation of the present invention in conjunction with the accompanying drawings. What is disclosed is only a preferred specific implementation of the present invention, and it is certainly not intended to limit the scope of rights of the new use model. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

[0020] Refer to the attached Figures 1 to 5 :The wet material indirect drying device in this embodiment includes a cylindrical drying inner cylinder 1, a main shaft 2 is arranged inside the drying inner cylinder 1, the main shaft 2 is located at the center of the drying inner cylinder 1, the main shaft 2 passes through the drying inner cylinder 1 in the axial direction of the drying inner cylinder 1 and is slidably connected and rotatably connected with the drying inner cylinder 1, one end of the main shaft 2 is connected to a motor 3, the motor 3 can drive the main shaft 2 to rotate, and a square drying outer box 4 is fixedly installed on the outside of the drying inner cylinder 1, and a small part is provided at both ends of the drying outer box 4. The drying inner cylinder 1 is exposed, and the bottom of the drying outer box 4 is provided with an air inlet 4a for the heat source gas to rise, and the top of the drying outer box 4 is provided with an air outlet 4b for the heat source gas to be discharged. The drying outer box 4 is made of heat insulating material to prevent the heat carried by the heat source gas from being quickly dissipated into the air. The thermal conductivity of the material used in the part of the drying inner cylinder 1 covered by the drying outer box 4 is higher than the thermal conductivity of the material used in the part of the drying inner cylinder 1 not covered by the drying outer box 4. For example, the drying outer cylinder 1 is covered by the drying outer box 4. The cover is made of copper, and the uncovered part is made of steel. A feed port 1a and a discharge port 1b are arranged opposite to each other at the two exposed ends of the drying inner cylinder 1. The feed port 1a is located at the top of the drying inner cylinder 1, and the discharge port 1b is located at the bottom of the drying inner cylinder 1. The material is put in from the feed port 1a, and is discharged from the discharge port 1b after passing through the inside of the drying inner cylinder 1. The device as a whole is fixed on the bottom plate 5, and the bottom of the drying outer box 4 is fixedly connected to the bottom plate 5. A plurality of stirring parts 6 are installed on the main shaft 2. The stirring parts 6 The main shaft 2 is rotatably connected in the radial direction, and a reciprocating mechanism 7 is also installed on the main shaft 2 for driving the main shaft 2 to reciprocate in the axial direction when the main shaft 2 rotates. When the reciprocating mechanism 7 drives the main shaft 2 to reciprocate, it can effectively avoid the material from being retained between the stirring parts 6, thereby improving the drying effect of the material. When the main shaft 2 reciprocates, the stirring part 6 swings irregularly, thereby breaking up the compacted material inside the drying inner cylinder 1, improving the fluidity of the material, and improving the drying efficiency.

[0021] Refer to the attached Figures 1 to 5The reciprocating mechanism 7 includes a pair of support plates 7-1 fixed on the bottom plate 5 and passed through by the main shaft 2, the main shaft 2 is rotatably connected and slidably connected to the support plate 7-1, a reciprocating push plate 7-2 fixed on the outside of the main shaft 2, a plurality of semicircular protrusions 7-3 fixed on the reciprocating push plate 7-2 in a circular array with the main shaft 2 as the center, a semicircular groove 7-4 provided on one of the support plates 7-1 and cooperating with the semicircular protrusion 7-3, the edge of the semicircular groove 7-4 can be provided with an arc chamfer to facilitate the semicircular protrusion 7-3 to enter and exit while reducing friction, a sleeve 7-5 splined with the main shaft 2 and fixed to the output shaft of the motor 3, and a sleeve A plurality of inner spline grooves are provided on the inner wall of 7-5, and a plurality of outer spline blocks matching with the spline grooves are provided on the outer side of one end of the main shaft 2. One end of the main shaft 2 is slidably connected in the sleeve 7-5, and the outer spline block is slidably connected inside the inner spline groove. A spring 7-6 is installed in the sleeve 7-5, which can push the main shaft 2 to press the semicircular protrusion 7-3 on the support plate 7-1 into the semicircular groove 7-4. When the main shaft 2 rotates, it will drive the reciprocating push plate 7-2 to rotate together. The rotation of the reciprocating push plate 7-2 will bring a plurality of semicircular protrusions 7-3 continuously in and out of the semicircular groove 7-4, so that the reciprocating push plate 7-2 drives the main shaft 2 to reciprocate in the axial direction.

[0022] Refer to the attached Figures 1 to 5 : A radially through-going mounting groove 2a is provided inside the main shaft 2, the stirring part 6 includes a mounting block 6-1 which is arranged in the mounting groove 2a and extends out of the mounting groove 2a at both ends, and a rotating pin 6-2 fixedly connected to the mounting block 6-1. The rotating pin 6-2 passes through the main shaft 2 and is rotatably connected to the main shaft 2. Stirring columns 6-3 are fixedly installed at both ends of the mounting block 6-1. When the main shaft 2 reciprocates, the mounting block 6-1 will drive the stirring column 6-3 to rotate irregularly in the mounting groove 2a, thereby crushing the compacted material from multiple angles and directions. The maximum rotation angle of the mounting block 6-1 can be controlled by setting the width of the mounting groove 2a.

[0023] Refer to the attached Figures 1 to 5 : The stirring part 6 can be extended when the main shaft 2 rotates, and the maximum extension length of the main shaft 2 is set to be tangent to the inner wall of the drying inner cylinder 1. A telescopic groove 6-4 is opened on the stirring column 6-3, and an extension rod 6-5 is slidably connected inside the telescopic groove 6-4. A return spring 6-6 fixedly connected to the extension rod 6-5 is installed inside the telescopic groove 6-4. When the main shaft 2 rotates, the extension rod 6-5 extends out of the telescopic groove 6-4 by inertia. When the main shaft 2 stops rotating, the extension rod 6-5 is retracted into the telescopic groove 6-4 by the return spring 6-6, and by controlling the rotation speed of the main shaft 2, the extension length of the extension rod 6-5 can be controlled. By intermittently stopping the rotation of the main shaft 2, the extension rod 6-5 can be repeatedly extended and retracted, thereby further enhancing the effect of stirring the materials.

[0024] A method for drying wet materials, the steps are as follows: Step 1: First, the wet material is put into the drying inner cylinder 1 through the feed port 1a, and then the heat source gas is passed into the drying outer box 4 from the air inlet 4a to heat the drying inner cylinder 1, and the heat source gas rises and is discharged through the air outlet 4b; Step 2: Start the motor 3, the output shaft of the motor 3 drives the sleeve 7-5 to rotate, the sleeve 7-5 drives the main shaft 2 to rotate, the rotation of the main shaft 2 drives the stirring column 6-3 and the reciprocating push plate 7-2 to rotate, the rotation of the reciprocating push plate 7-2 drives a plurality of semicircular protrusions 7-3 to continuously enter and exit the semicircular groove 7-4, so that the main shaft 2 reciprocates in the axial direction, the reciprocating motion of the main shaft 2 drives the stirring column 6-3 to reciprocate and swing in the mounting groove 2a at the same time, so as to stir and crush the wet material in a larger range, so that the wet material can be fully contacted with the heat source gas for drying; Step three: The stirring column 6-3 generates inertia when rotating, and the extension rod 6-5 is extended out of the telescopic slot 6-4. When the stirring column 6-3 stops rotating, the extension rod 6-5 is retracted into the telescopic slot 6-4. By intermittently starting and stopping the motor 3, the extension rod 6-5 is frequently extended and retracted to better stir and shovel the wet material. The extension length of the extension rod 6-5 can be controlled by controlling the rotation speed of the motor 3.

[0025] Step 4: The wet material is dried in the drying inner cylinder 1 and then discharged and collected through the discharge port 1b.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An indirect drying device for wet materials, comprising a drying inner cylinder (1), a main shaft (2) axially passing through the drying inner cylinder (1), a motor (3) for driving the main shaft (2) to rotate, a drying outer box (4) fixed to the outside of the drying inner cylinder (1), and a bottom plate (5) fixedly connected to the bottom of the drying outer box (4), characterized in that: A stirring portion (6) rotatably connected to the main shaft (2) in the radial direction, and a reciprocating mechanism (7) for driving the main shaft (2) to reciprocate in the axial direction when the main shaft (2) rotates, wherein the stirring portion (6) swings under the drive of the reciprocating mechanism (7).

2. The wet material indirect drying device according to claim 1 is characterized in that: The reciprocating mechanism (7) comprises a pair of support plates (7-1) fixed on a base plate (5) and passed through by a main shaft (2), a reciprocating push plate (7-2) fixed on the outside of the main shaft (2), a plurality of semicircular protrusions (7-3) fixed on the reciprocating push plate (7-2) in a circular array with the main shaft (2) as the center, a semicircular groove (7-4) provided on one of the support plates (7-1) and matched with the semicircular protrusion (7-3), a sleeve (7-5) spline-connected to the main shaft (2) and fixed to the output shaft of the motor (3), and a spring (7-6) installed in the sleeve (7-5) and capable of pressing the semicircular protrusion (7-3) on the support plate (7-1) into the semicircular groove (7-4) by pushing the main shaft (2).

3. The wet material indirect drying device according to claim 1 is characterized in that: The main shaft (2) is provided with a radially penetrating mounting groove (2a) inside, and the stirring portion (6) comprises a mounting block (6-1) disposed in the mounting groove (2a) and extending out of the mounting groove (2a) at both ends, a rotating pin (6-2) fixedly connected to the mounting block (6-1) and rotatably connected to the main shaft (2), and stirring columns (6-3) fixed to both ends of the mounting block (6-1).

4. The wet material indirect drying device according to claim 3 is characterized in that: The stirring portion (6) can extend when the main shaft (2) rotates.

5. The wet material indirect drying device according to claim 4 is characterized in that: The stirring column (6-3) is provided with a telescopic groove (6-4), an extension rod (6-5) is slidably connected inside the telescopic groove (6-4), a return spring (6-6) fixedly connected to the extension rod (6-5) is installed inside the telescopic groove (6-4), the extension rod (6-5) extends out of the telescopic groove (6-4) by inertia when the main shaft (2) rotates, and the extension rod (6-5) is retracted into the telescopic groove (6-4) by the return spring (6-6) when the main shaft (2) stops rotating.

6. The wet material indirect drying device according to claim 1 is characterized in that: The top of the drying inner cylinder (1) is provided with a feed inlet (1a), and the bottom of the drying inner cylinder (1) is provided with a discharge outlet (1b).

7. The wet material indirect drying device according to claim 1 is characterized in that: The bottom of the drying outer box (4) is provided with an air inlet (4a) for facilitating the rise of the heat source gas, and the top of the drying outer box (4) is provided with an air outlet (4b) for facilitating the discharge of the heat source gas.

8. The wet material indirect drying device according to claim 1 is characterized in that: The thermal conductivity of the material used in the portion of the drying inner cylinder (1) covered by the drying outer box (4) is higher than the thermal conductivity of the material used in the portion of the drying inner cylinder (1) not covered by the drying outer box (4).

9. The wet material indirect drying device according to claim 1 is characterized in that: The drying outer box (4) is made of heat-insulating material.

10. A method for drying wet materials using the wet material indirect drying device according to claim 1, comprising the following steps: Step 1: first, wet material is fed into the drying inner cylinder (1) through the feed port (1a), and then heat source gas is introduced into the drying outer box (4) from the air inlet (4a) to heat the drying inner cylinder (1), and the heat source gas rises and is discharged through the air outlet (4b); Step 2: starting the motor (3), the output shaft of the motor (3) drives the sleeve (7-5) to rotate, the sleeve (7-5) drives the main shaft (2) to rotate, the rotation of the main shaft (2) drives the stirring column (6-3) and the reciprocating push plate (7-2) to rotate, the rotation of the reciprocating push plate (7-2) drives the plurality of semicircular protrusions (7-3) to continuously enter and exit the semicircular groove (7-4), so that the main shaft (2) reciprocates in the axial direction, the reciprocating motion of the main shaft (2) drives the stirring column (6-3) to reciprocate and swing in the mounting groove (2a) at the same time, so that the wet material is stirred over a larger range, so that the wet material is fully in contact with the heat source gas for drying; Step 3: The stirring column (6-3) generates inertia when rotating, and the extension rod (6-5) extends out of the telescopic slot (6-4). When the stirring column (6-3) stops rotating, the extension rod (6-5) is retracted into the telescopic slot (6-4). By intermittently starting and stopping the motor (3), the extension rod (6-5) is frequently extended and retracted to better stir and shovel the wet material. The extension length of the extension rod (6-5) can be controlled by controlling the rotation speed of the motor (3). Step 4: The wet material is dried in the drying inner cylinder (1) and then discharged and collected through the discharge port (1b).

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