Bentonite drying equipment

Abstract

The utility model discloses bentonite drying equipment in the technical field of drying equipment, which comprises a drying box, the drying box is provided with a feed port and a discharge port, the top end of the drying box is provided with an exhaust port, the peripheral side of the bottom end of the drying box is provided with an air inlet, the air inlet is communicated with a hot air supply structure, and hot air enters the drying box through the air inlet. The hot air is in a spiral form in the drying box, a crushing mechanism is arranged in the drying box, the crushing mechanism is located below the feeding port, to-be-dried materials crushed by the crushing mechanism spirally rise along with the hot air, moisture is rapidly evaporated, and therefore the drying process is completed, and the dried materials fall down along the box wall of the drying box and are discharged through the discharging port. The technical problem that an existing device is low in drying efficiency is solved.

Description

Technical Field

[0001] This utility model relates to the field of drying equipment technology, and in particular to a bentonite drying equipment. Background Technology

[0002] Bentonite is a non-metallic mineral with montmorillonite as its main mineral component. It has strong hygroscopicity and swelling properties, and can absorb 8-15 times its own volume of water, expanding in volume by several times. Therefore, drying equipment is required to dry bentonite during the production process.

[0003] Chinese utility model patent CN222528211U discloses a high-efficiency and energy-saving bentonite dryer, including multiple drying racks, multiple feed pipes, multiple material handling doors, multiple tilting structures, and an adjustment structure. The drying racks are arranged sequentially from top to bottom on the inner wall of the drying chamber. Multiple feed pipes are located on the left side of the drying chamber, above the drying racks. Multiple material handling doors are movably connected to the right side of the drying chamber, corresponding to the positions of the drying racks. Multiple tilting structures are located inside the drying racks within the drying chamber. An adjustment structure is located at the bottom of the drying chamber. The tilting structures utilize a motor-driven rotating shaft with tilting plates mounted on it. These tilting plates agitate the bentonite on the drying racks, increasing the contact area between the bentonite and hot air to a certain extent.

[0004] After absorbing water, bentonite has strong binding properties. During long-term production, the water-containing bentonite will seriously stick to the turning plate. On the one hand, this leads to poor turning effect of the turning plate, and on the other hand, it may cause the rotation of the shaft to be obstructed, requiring the machine to be stopped to clean the turning plate. Frequent shutdowns for cleaning not only affect drying efficiency, but also increase equipment maintenance costs and affect the continuity of production. Utility Model Content

[0005] To address the technical problem of low drying efficiency in existing technologies, this utility model provides a bentonite drying device.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] The bentonite drying equipment includes a drying box with a feed inlet and a discharge outlet. The top of the drying box has an exhaust vent, and the bottom outer periphery of the drying box has an air inlet connected to a hot air supply structure. Hot air enters the drying box through the air inlet and spirals inside the drying box. The drying box has a crushing mechanism located below the feed inlet. The material to be dried, after being crushed by the crushing mechanism, rises spirally with the hot air.

[0008] Furthermore, there are multiple air inlets, arranged in a ring at intervals around the circumference of the drying chamber.

[0009] Furthermore, the hot air supply structure has internal air ducts, which are volute-shaped.

[0010] Furthermore, it also includes a base, with the drying chamber located above the base. The bottom of the drying chamber is open to form a discharge port. A discharge port is opened on the upper surface of the base, and the vertical projection of the discharge port on the horizontal plane falls into the open. The air inlet is an annular air inlet gap, which is formed by the gap between the edge of the open and the upper surface of the base. The hot air supply structure is arranged around the outer periphery of the bottom of the drying chamber and is sealed to the upper surface of the base. The hot air enters the drying chamber in the tangential direction of the annular air inlet gap and is spiral in shape inside the drying chamber.

[0011] The gap between the open edge and the upper surface of the base forms an annular air inlet gap. Hot air enters the drying chamber tangentially through this gap and spirals upwards within the chamber. The crushing mechanism breaks down the material to be dried, causing it to disperse rapidly and rotate at high speed with the spiral hot airflow. Moisture evaporates quickly, completing the drying process. The dried material falls along the chamber wall and is discharged through the outlet. The linkage between the crushing mechanism and the high-speed spiral hot air improves drying efficiency and reduces material adhesion to the crushing mechanism, minimizing downtime for maintenance.

[0012] Furthermore, the crushing mechanism includes a rotating shaft and a crushing blade. A motor for driving the crushing mechanism is installed on the base. The motor output end has a first transmission part. The rotating shaft is vertically arranged. The first end of the rotating shaft has a second transmission part. The first transmission part and the second transmission part are connected in a transmission connection. The second end of the rotating shaft extends into the drying chamber. The crushing blade is installed on the rotating shaft. The motor drives the rotating shaft to rotate, thereby causing the crushing blade to rotate inside the drying chamber.

[0013] Furthermore, the device includes a belt, a first transmission part consisting of a first pulley, and a second transmission part consisting of a second pulley, with the first pulley and the second pulley being driven by a belt.

[0014] Furthermore, there are four sets of crushing blades, arranged at intervals along the axial direction of the rotating shaft, with the bottom set of crushing blades being wider and longer than the other three sets.

[0015] Furthermore, the discharge port is equipped with a screen with sieve holes, the diameter of which is 10cm-12cm.

[0016] Furthermore, the equipment includes a double-screw feeder, a hopper at the inlet of the drying chamber, a sealed connection between the hopper and the inlet, a shell at the output end of the double-screw feeder and a sealed connection between the shell at the output end of the double-screw feeder and the input end of the hopper to prevent external air from entering the drying chamber through the hopper, a baffle plate hinged to the bottom of the discharge port to cover the discharge port, and an external exhaust fan connected to the exhaust port of the drying chamber to extract gas from the drying chamber and create a negative pressure inside the drying chamber. The baffle plate has two states: open and closed. When the sum of the weight of the dried material on the baffle plate and the baffle plate is less than the negative pressure on the baffle plate, the baffle plate closes the discharge port; when the sum of the weight of the dried material on the baffle plate and the baffle plate is greater than the negative pressure on the baffle plate, the baffle plate opens the discharge port.

[0017] Furthermore, it includes a receiving hopper and a screw conveyor. The receiving hopper is located directly below the discharge port, and the screw conveyor is used to transport the material in the receiving hopper.

[0018] Furthermore, the drying oven walls are made of double-layered stainless steel, with rock wool insulation material filling the space between the two layers.

[0019] The beneficial effects of this utility model are:

[0020] An air inlet is located on the outer periphery of the bottom of the drying chamber. Hot air enters the drying chamber through the air inlet via the hot air supply structure. Inside the drying chamber, the hot air rises in a spiral pattern. The crushing mechanism breaks down and refines the material to be dried. The material is rapidly dispersed and rotates at high speed with the spiral hot air flow, causing moisture to evaporate quickly and completing the drying process. After drying, the material falls along the wall of the drying chamber and is discharged through the outlet. The linkage between the crushing mechanism and the high-speed spiral hot air not only improves drying efficiency but also reduces the adhesion of the material to be dried to the crushing mechanism, thus reducing the frequency of downtime maintenance. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the bentonite drying equipment of this utility model;

[0022] Figure 2 This is a schematic diagram of the hot air supplied by the hot air supply structure entering the annular air inlet gap;

[0023] The diagram is labeled as follows: 1-Drying box, 2-Feed inlet, 3-Exhaust outlet, 4-Hot air supply structure, 5-Annular air inlet gap, 6-Base, 7-Discharge port, 8-Rotating shaft, 9-Crushing blade, 10-Motor, 11-Belt, 12-First pulley, 13-Second pulley, 14-Double helix feeder, 15-Hopper, 16-Baffle plate, 17-Screw, 18-Receiving hopper, 19-Screw conveyor. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the present invention will be further described below with reference to the accompanying drawings.

[0025] First, it should be stated that the technical solutions of the embodiments of this application are clearly and completely described. The described embodiments are only some of the embodiments of this application, and not a limitation of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0026] In the description of this utility model, it should be understood that the terms "first", "second", "upper", "lower", "left", "right", "inner", "outer", "axial" or "radial" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and are not intended to indicate or imply that the device or element referred to must have a specific orientation structure and operation. Therefore, they should not be construed as limitations on this utility model.

[0027] It should be noted that, in this utility model, unless otherwise explicitly specified and limited, the terms "connection" and "fixation," etc., should be interpreted broadly. For example, "fixation" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] like Figure 1 and Figure 2 As shown, this utility model provides a bentonite drying device.

[0029] like Figure 1 and Figure 2As shown, the bentonite drying equipment includes a drying chamber 1, which has a feed inlet 2 and a discharge outlet. The top of the drying chamber 1 has an exhaust vent 3. Fine powdery materials enter the subsequent dust collection system through the exhaust vent 3 along with the high-temperature exhaust gas. An air inlet is located on the outer periphery of the bottom of the drying chamber 1, connected to a hot air supply structure 4. Hot air enters the drying chamber 1 through the air inlet and forms a spiral pattern within the drying chamber 1, creating a high-speed rotating airflow field (wind speed up to 20m / s-30m / s). The drying chamber 1 has a crushing mechanism located below the feed inlet 2. The material to be dried, after being crushed by the crushing mechanism, rises spirally with the hot air. The crushing mechanism breaks down and refines the material, causing it to disperse rapidly and rotate at high speed with the spiral hot airflow. Moisture evaporates quickly, completing the drying process. The dried material falls along the wall of the drying chamber 1 and is discharged through the discharge outlet.

[0030] For air inlets, one or more can be set. When there are multiple air inlets, the multiple air inlets are arranged in a ring around the circumference of the drying box, preferably at equal intervals, so that the air intake is more stable. Of course, if the effect is slightly worse, they can be arranged at non-equal intervals.

[0031] For the crushing mechanism, conventional crushing mechanisms currently used in this field can be employed to crush the material to be dried, such as impact crushing mechanisms or shear crushing mechanisms. Alternatively, the following settings can be used:

[0032] The crushing mechanism includes a rotating shaft 8 and crushing blades 9. The rotating shaft 8 is vertically arranged, and a motor 10 driving the crushing mechanism is mounted on a base 6. The output end of the motor 10 has a first transmission part. The motor 10 can be mounted on the drying chamber 1, or preferably fixed on the base 6 to avoid the damp material affecting the operation of the motor 10. The first end of the rotating shaft 8 has a second transmission part, and the first transmission part and the second transmission part are connected. The second end of the rotating shaft 8 extends into the drying chamber 1. The crushing blades 9 are mounted on the rotating shaft 8. The motor 10 drives the rotating shaft 8 to rotate, thereby causing the crushing blades 9 to rotate within the drying chamber 1, ensuring that the material particles can achieve a centimeter-level dispersion state, laying the foundation for subsequent efficient drying. The first transmission part and the second transmission part can be directly coaxially welded, or they can be gear meshing or gear and rack meshing. In this embodiment, it is preferred that the first transmission part is a first pulley 12 and the second transmission part is a second pulley 13, and the first pulley 12 and the second pulley 13 are driven by a belt 11.

[0033] In this embodiment of the solution, a base 6 can also be provided, and the drying box 1 is located above the base 6. The bottom of the drying box 1 is open to form a discharge port. A discharge port 7 is provided on the upper surface of the base 6. The vertical projection of the discharge port 7 on the horizontal plane falls into the open. The air inlet is an annular air inlet gap 5, which is formed by the gap between the edge of the open and the upper surface of the base 6. The hot air supply structure 4 is arranged around the outer periphery of the bottom end of the drying box 1. The hot air supply structure 4 is sealed to the upper surface of the base 6. The hot air enters the drying box 1 in the tangential direction of the annular air inlet gap 5. The hot air is in a spiral shape inside the drying box 1.

[0034] For the hot air supply structure 4, a conventionally shaped duct can be installed around the drying chamber 1. Preferably, as shown below... Figure 2 As shown, the air duct inside the hot air supply structure 4 is set as a volute, which can make the hot air spiral inside the drying box 1. The pipe specifications inside the hot air supply structure 4 are 800mm-1000mm in diameter, made of Q235 high-quality carbon steel, with a wall thickness of 2.5mm-3mm, to ensure the system's pressure bearing capacity and structural strength. The heat source is a direct-fired coal-fired hot air furnace.

[0035] The discharge port 7 can be set vertically, or preferably vertically downwards, with the radial dimension of the discharge port 7 continuously decreasing, which facilitates material discharge.

[0036] The gap between the edge of the opening and the upper surface of the base 6 forms an annular air inlet gap 5. Hot air enters the drying chamber 1 tangentially through the annular air inlet gap 5. The hot air rises in a spiral pattern inside the drying chamber 1, where the crushing mechanism breaks down and refines the material to be dried. The material is rapidly dispersed and rotates at high speed with the spiral hot air flow, causing moisture to evaporate quickly and completing the drying process. After drying, the material falls along the wall of the drying chamber 1 and is discharged through the discharge port 7. The linkage between the crushing mechanism and the high-speed spiral hot air improves drying efficiency and reduces the adhesion of the material to be dried to the crushing mechanism, thus reducing the frequency of downtime maintenance.

[0037] Regarding the arrangement of the crushing blades 9, one or more sets of crushing blades 9 can be set. In this embodiment, the preferred number of crushing blades 9 is four sets, arranged at intervals along the axial direction of the rotating shaft 8. The width and length of the bottom set of crushing blades 9 are larger than the other three sets of crushing blades 9. All crushing blades 9 are made of manganese alloy steel and the surface is specially treated to improve wear resistance. The top three layers use narrower crushing blades 9, with a width of 100mm-120mm and a length of 750mm-800mm. The specific length and width are adapted to the drying chamber 1. When the material to be dried enters the drying chamber 1 through the feed inlet 2, it falls onto the narrower crushing blades 9 on the top layer by gravity, achieving forced crushing. The bottom layer is equipped with wider crushing blades 9, with a width of 150mm-180mm and a length of 800mm-850mm. The specific length and width are adapted to the drying chamber 1. Of course, to achieve only a preliminary crushing function, the crusher blades 9 can be set in one or more sets. The crusher blades 9 can be set perpendicular to the rotating shaft 8 or slightly tilted to achieve multi-angle cutting, thus covering a larger area of ​​rotational cutting. Alternatively, the crusher blades 9 are preferably arranged in four sets, spaced apart along the axial direction of the rotating shaft 8. The bottom two sets of crusher blades 9 have the same width and length, and the top two sets of crusher blades 9 have the same width and length. Furthermore, the bottom two sets of crusher blades 9 are wider and longer than the top two sets of crusher blades 9. The purpose of setting the width of the upper crusher blades 9 is to prevent too much material to be dried from falling onto the blade surface of the upper crusher blades 9, affecting the crushing effect. The purpose of setting the width of the lower crusher blades 9 is to allow the wider crusher blades 9 to achieve secondary crushing and also act as a throwing element. The lower crusher blades 9 scrape the dried material and discharge it through the discharge port 7, preventing the dried material from clogging the annular air inlet gap 5.

[0038] Furthermore, the gap between the edge of the opening and the upper surface of the base 6 is 5cm-10cm, so that the hot air enters the drying chamber 1 in the tangential direction of the annular air inlet gap 5. The hot air rises in a spiral shape inside the drying chamber 1. If the gap is too large, the spiral wind speed will be low and the spiralization degree will be low.

[0039] Furthermore, the discharge port 7 is equipped with a screen 17 with sieve holes of 10-12 cm in diameter. The sieve hole diameter is controlled between 10-12 mm to ensure that the discharged material particle size is between 5-10 mm. If the particle size is less than 5 mm, coking and dehydration are likely to occur after drying, leading to a surge in dust and increasing the burden on the subsequent dust collection system. If the particle size is greater than 10 mm, a "sandwich" phenomenon may occur, meaning the inside of the particle is not fully dried. Material that does not pass through the screen 17 will be recycled to the wider crusher 9 below for further crushing, forming a closed-loop control.

[0040] Furthermore, including the double-screw feeder 14, the feed inlet 2 of the drying chamber 1 has a hopper 15, which is sealed to the feed inlet 2. The double-screw feeder 14 has a shell, and the shell at the output end of the double-screw feeder 14 is sealed to the input end of the hopper 15 to prevent external air from entering the drying chamber 1 through the hopper 15. If it is not sealed, it will lower the temperature inside the drying chamber 1 and affect the negative pressure state inside the drying chamber 1. The bottom of the discharge port 7 is hinged to a cover that can cover the discharge port. The baffle plate 16 of the drying chamber 1 is connected to an external exhaust fan at the exhaust port 3 of the drying chamber 1. The fan is used to extract the gas inside the drying chamber 1, so that a negative pressure is formed inside the drying chamber 1. The baffle plate 16 has two states: open and closed. When the sum of the weight of the dried material on the baffle plate 16 and the baffle plate 16 is less than the negative pressure on the baffle plate 16, the baffle plate 16 closes the discharge port 7. When the sum of the weight of the dried material on the baffle plate 16 and the baffle plate 16 is greater than the negative pressure on the baffle plate 16, the baffle plate 16 opens the discharge port 7.

[0041] Furthermore, the system includes a receiving hopper 18 and a screw conveyor 19. The receiving hopper 18 is located directly below the discharge port 7, and the screw conveyor 19 is used to transport the material inside the receiving hopper 18.

[0042] Furthermore, the walls of the drying oven 1 are made of double-layer stainless steel, with rock wool insulation material filling the space between the two layers.

Claims

1. A bentonite drying device, comprising a drying chamber (1), the drying chamber (1) having a feed inlet (2) and a discharge outlet, characterized in that: The top of the drying box (1) has an exhaust port (3), and the bottom of the drying box (1) has an air inlet on the outer side. The air inlet is connected to a hot air supply structure (4). Hot air enters the drying box (1) through the air inlet. The hot air is spiral in the drying box (1). The drying box (1) has a crushing mechanism located below the feed inlet (2). The material to be dried after being crushed by the crushing mechanism rises spirally with the hot air.

2. The bentonite drying equipment as described in claim 1, characterized in that: There are multiple air inlets, which are arranged in a ring-shaped interval along the circumference of the drying box (1).

3. The bentonite drying equipment as described in claim 1, characterized in that: The hot air supply structure (4) has an internal air duct, which is volute-shaped.

4. The bentonite drying equipment as described in claim 1, characterized in that: It also includes a base (6), a drying box (1) located above the base (6), the bottom of the drying box (1) is open to form a discharge port, a discharge port (7) is opened on the upper surface of the base (6), the vertical projection of the discharge port (7) on the horizontal plane falls into the open, the air inlet is an annular air inlet gap (5), the annular air inlet gap (5) is formed by the gap between the edge of the open and the upper surface of the base (6), the hot air supply structure (4) is arranged around the outer periphery of the bottom end of the drying box (1), the hot air supply structure (4) is sealed to the upper surface of the base (6), the hot air enters the drying box (1) from the tangential direction of the annular air inlet gap (5), and the hot air is in a spiral shape in the drying box (1).

5. The bentonite drying equipment as described in claim 4, characterized in that: The crushing mechanism includes a rotating shaft (8) and a crushing blade (9). A motor (10) for driving the crushing mechanism is provided on the base (6). The output end of the motor (10) has a first transmission part. The rotating shaft (8) is vertically arranged. The first end of the rotating shaft (8) has a second transmission part. The first transmission part and the second transmission part are connected in transmission. The second end of the rotating shaft (8) extends into the drying box (1). The crushing blade (9) is installed on the rotating shaft (8). The motor (10) drives the rotating shaft (8) to rotate, thereby causing the crushing blade (9) to rotate in the drying box (1).

6. The bentonite drying equipment as described in claim 5, characterized in that: Includes a belt (11), a first transmission part is a first pulley (12), and a second transmission part is a second pulley (13). The first pulley (12) and the second pulley (13) are driven by the belt (11).

7. The bentonite drying equipment as described in claim 5, characterized in that: There are four sets of crushing blades (9), which are arranged at intervals along the axial direction of the rotating shaft (8). The width and length of the bottom set of crushing blades (9) are larger than those of the other three sets of crushing blades (9).

8. The bentonite drying equipment as described in claim 4, characterized in that: The discharge port (7) is equipped with a screen (17), which has sieve holes with a diameter of 10cm-12cm.

9. The bentonite drying equipment as described in claim 4, characterized in that: Includes a double spiral feeder (14), the feed inlet (2) of the drying chamber (1) has a hopper (15), the hopper (15) is sealed to the feed inlet (2), the double spiral feeder (14) has a shell, the shell at the output end of the double spiral feeder (14) is sealed to the input end of the hopper (15) to prevent external air from entering the drying chamber (1) through the hopper (15), the bottom of the discharge port (7) is hinged with a baffle plate (16) that can cover the discharge port (7), and the exhaust port (3) of the drying chamber (1) is externally connected. There is an induced draft fan used to draw gas from the drying chamber (1) to create a negative pressure inside the drying chamber (1). The baffle plate (16) has two states: open and closed. When the sum of the weight of the dried material on the baffle plate (16) and the baffle plate (16) is less than the negative pressure on the baffle plate (16), the baffle plate (16) closes the discharge port (7). When the sum of the weight of the dried material on the baffle plate (16) and the baffle plate (16) is greater than the negative pressure on the baffle plate (16), the baffle plate (16) opens the discharge port (7).

10. The bentonite drying equipment as described in claim 9, characterized in that: It includes a receiving hopper (18) and a screw conveyor (19). The receiving hopper (18) is located directly below the discharge port (7), and the screw conveyor (19) is used to transport the material in the receiving hopper (18).

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