Flash drying feeding system

Abstract

The utility model relates to a flash evaporation drying feeding system which comprises a movable belt conveyor, a beater, a double-screw conveyor and a main tower, a rolling bearing is arranged at the tail end of the double-screw conveyor, and a bearing seat is fixed on the outer side of a discharging hopper entering the main tower and does not directly extend into the main tower. By means of the flash evaporation drying feeding system, the service life of a screw conveyor bearing can be prolonged, materials are prevented from entering a gap between a shaft and the bearing, impurities generated by abrasion of the bearing are prevented from being brought into a main tower, and the problem that the main tower is cooled due to air leakage of a feeding port is solved. The main hollow shaft and the scattering teeth of the scattering machine are convenient to disassemble or replace, and a specially-assigned person does not need to care the movable belt conveyor with the material level switch.

Description

Technical Field

[0001] The utility model belongs to the field of chemical industry, and specifically relates to a flash drying feeding system. Background Art

[0002] In the chemical industry, flash drying equipment is widely used for material drying. For example, CN101762147A discloses a clay mineral drying device, which is used in conjunction with a hot air blower and a dust collector. The device consists of a grading mechanism, a drying and dispersing mechanism, a feeding mechanism, and a discharging mechanism. The grading mechanism is arranged on the upper part of the drying and dispersing mechanism, the feeding mechanism is arranged on the side of the drying and dispersing mechanism, and the discharging mechanism is arranged on the lower part of the drying and dispersing mechanism. This drying device has a narrow application field and is only suitable for drying clay minerals. The disintegrator is a commonly used equipment in the drying system. The article "High-speed disintegrator and its application" published by Xu Ziqin et al. in "Non-metallic Minerals" (Volume 25, Issue 3, May 2002) introduces the design concept of the disintegrator: (1) The hammers and linings in the disintegrator and the blades in the grading device are all made of replaceable, non-polluting wear-resistant alloy materials; (2) The grading chamber lining is made of the latest special industrial ceramics developed by our institute, which has excellent wear resistance and strength, is easy to replace, and the gap between the blades and the lining is convenient to adjust; (3) The number of hammers in the disintegrator and the number of grading blades as well as their shapes and sizes are determined through theoretical calculations. Dai Enliang et al. concluded in the article "The Effect of Different Structures and Particle Viscosity on the Performance of Twin Screw Conveyors" published in Mechanical Design and Manufacturing (Issue 3, March 2020) that: (1) The conveying capacity of the twin screw conveyor can be increased by appropriately increasing the screw speed and filling rate of the twin screw conveyor; (2) Regardless of whether the transported material is viscous or not, the working condition is most suitable when the misalignment between the two spiral blades of the twin screw conveyor is half the pitch; if the designed twin screw conveyor is mainly used for the transportation of viscous materials, a structure with a large overlap between the two spiral blades should be adopted; if the design The double screw conveyor is mainly used for the transportation of non-sticky materials, and the two spiral blades should adopt a structure with no overlap; (3) The double screw conveyor is more suitable for transporting sticky materials, and the greater the viscosity between the materials, the greater the conveying capacity, the lower the power consumption, and the better the overall working condition; (4) As the viscosity between the materials increases, the agglomeration effect between the particles will increase, and the contact force between the particles and between the particles and the outer shell will decrease, so that the power consumption caused by the collision between the particles and the friction between the particles and the outer shell will be reduced, and at the same time, the average axial speed of the particles will increase, leading to an increase in the conveying capacity. (5) Due to the agglomeration of the particles, holes will be formed at the bottom of the double screw conveyor. Therefore, when transporting sticky materials, the filling rate of the double screw conveyor should not be too large to prevent the overflow of the particle clusters, which will lead to increased power consumption.

[0003] Traditional flash drying equipment generally uses a belt conveyor, a scattering machine and a double screw machine to transport the materials to be dried to the main drying tower for drying. The dried materials are collected by a cyclone and a dust collector, and the collected materials are finally separated by a rotary vibrating screen to obtain the desired finished products. The existing flash drying feeding system has defects such as air leakage at the feeding port during feeding, which causes the main tower operating temperature to drop, the double screw shaft is easy to wear and bring metal impurities into the tower, and the gap between the shaft and the bearing is difficult to clean.

[0004] The existing flash drying technology feeding system is to unload the material to be dried into the upper hopper, and then transport it to the dispersing machine through a mobile belt conveyor for dispersing and mixing, and finally transport it to the drying main tower for drying through a double screw conveyor. The tail end of the existing double screw conveyor is fixed with a sleeve and directly extends into the main tower. The existing dispersing machine uses fixed teeth welded to the main hollow shaft, and the short shafts on both sides are transitionally matched with the main hollow shaft and fixed with locking bolts. The shaft ends are sealed with packing and the tail is fixed with a tail bearing. After entering the dispersing machine, the material is dispersed by the fixed teeth and then enters the double screw conveyor for transportation, and finally enters the main tower for drying. A dedicated person is required to watch the material level in the dispersing machine hopper. When the material is at a high level, the belt conveyor must be stopped in time to prevent the dispersing machine from overloading or the material from overflowing from the hopper when the warehouse is full.

[0005] In addition, the existing feeding system's scatterer adopts fixed scattering teeth welded on the main hollow shaft. After the material is broken up by the scattering teeth, it is conveyed into the main tower for drying through a double screw conveyor. When the material level is high, the viscosity is relatively large, and the particles are relatively fine, the scatterer has a large load and a high current when working, and the equipment is prone to tripping and stopping. When the scattering teeth need to be replaced, the main hollow shaft of the scattering teeth and the short shafts on both sides are tightly matched, making it difficult to disassemble, which increases the maintenance workload. In addition, a special person needs to be set up on site to observe the material in the hopper of the scatterer. When the material is full, the feeding belt mechanism needs to be stopped manually. The equipment has a low degree of automation, which is not conducive to long-term continuous production. Utility Model Content

[0006] In order to solve the above technical problems, the utility model provides a flash drying feeding system to increase the service life of the screw machine bearing, prevent materials from entering the gap between the shaft and the bearing, avoid bringing impurities generated by bearing wear into the main tower, solve the problem of cooling the main tower due to air leakage at the feed inlet, facilitate disassembly or replacement of the main hollow shaft and scattering teeth of the scattering machine, and do not require special personnel to guard the material level switch belt conveyor.

[0007] To this end, the utility model provides a flash drying feeding system, which includes a mobile belt conveyor, a scattering machine, a double screw conveyor and a main tower, and is characterized in that a rolling bearing is used at the tail end of the double screw conveyor, and the bearing seat is fixed on the outside of the hopper under the main tower without directly penetrating into the main tower, and the scattering teeth of the scattering machine are movably connected.

[0008] Preferably, according to the above-mentioned flash drying feeding system, a weight flap valve is arranged above the double screw conveyor.

[0009] More preferably, according to the above-mentioned flash drying feeding system, a feeding sight glass and an inspection and flushing door are provided on the shell of the scattering machine.

[0010] More preferably, according to the above-mentioned flash drying feeding system, a nut seat is welded on the main hollow shaft of the scattering machine, and the scattering teeth are movably installed on the nut seat.

[0011] More preferably, according to the above-mentioned flash drying feeding system, the scattering teeth include end scattering teeth, middle scattering teeth and tail scattering teeth.

[0012] More preferably, according to the above-mentioned flash drying feeding system, a nut seat is fixed to one end of the middle scattering teeth and the tail scattering teeth, and a corresponding thread is set at the other end, and only one end of the end scattering teeth is set with a corresponding thread.

[0013] More preferably, according to the above-mentioned flash drying feeding system, diaphragm couplings are installed on both sides of the main hollow shaft of the disperser, one side is the head diaphragm coupling, which is connected to the speed regulating motor shaft, and the other side is the tail diaphragm coupling, which is connected to the tail short shaft, and the tail short shaft is fixed by the tail bearing seat.

[0014] More preferably, according to the above-mentioned flash drying feeding system, movable cover plates are provided on both sides of the hopper of the disperser.

[0015] More preferably, according to the above-mentioned flash drying feeding system, a rotary paddle level switch is arranged on the top of the hopper of the disintegrator.

[0016] More preferably, according to the above-mentioned flash drying feeding system, it also includes a feeding hopper and a flap valve receiving hopper.

[0017] The flash drying feeding system of the utility model, in which the scattering teeth of the scattering machine are connected in a movable manner, can improve the service life of the screw machine bearing, prevent the material from entering the gap between the shaft and the bearing, avoid the impurities caused by the bearing wear from entering the main tower, solve the problem of the main tower cooling caused by air leakage at the feed inlet, facilitate the disassembly or replacement of the main hollow shaft and scattering teeth of the scattering machine, and do not require a dedicated person to take care of the material level switch mobile belt conveyor. Specifically, the following beneficial effects are achieved:

[0018] 1. Solved the problem of metal impurities generated at the feeding tail of the double screw conveyor due to sleeve wear and the difficulty in cleaning the gap between the shaft and the sleeve.

[0019] 2. Solved the problem of heat consumption and increased steam consumption caused by air leakage at the belt conveyor feed port, and improved economic benefits.

[0020] 3. It solves the problem that when the dispersing machine is faced with materials with small particles and high viscosity, the heavy workload may cause the motor current to be large and easy to trip and stop.

[0021] 4. The problem of the difficulty in disassembling the main hollow shaft and the scattering teeth when replacing the scattering machine and the large amount of manual work has been solved.

[0022] 5. It solves the problem that the material level of the breaker needs to be supervised by a dedicated person, and the problem of manually stopping the belt conveyor when the material level is high increases the labor cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a diagram of the flash drying feeding system of the utility model, wherein a is a side view and b is a front view.

[0024] Figure 2 for Figure 1 An enlarged view of point III in figure a.

[0025] Figure 3 It is a partial layout diagram of the disintegrator in the utility model, wherein b is the right view of a.

[0026] Figure 4 for Figure 3 An enlarged schematic diagram of point IV in figure a.

[0027] Among them, 1-upper hopper, 2-mobile belt conveyor, 3-disperser, 4-double screw conveyor, 5-main tower, 6-double screw speed regulating motor, 7-disperser speed regulating motor, 8-main tower mixer, 9-mixer speed regulating motor, 10-flap valve hopper, 11-weight flap valve, 12-inspection and flushing door, 13-discharging sight glass, 14-entering main tower lower hopper; 15-bearing seat, 16-fluorine skeleton oil seal, 3-1: rotary level switch, 3-2: dispersing teeth, 3-3: main hollow shaft, 3-4: movable cover plate, 3-5: tail diaphragm coupling, 3-6: tail bearing seat, 3-7: head diaphragm coupling; 3-2-1: end dispersing teeth, 3-2-2: middle dispersing teeth, 3-2-3: tail dispersing teeth, 3-3-4: nut seat. DETAILED DESCRIPTION

[0028] The utility model is described in detail below with reference to the accompanying drawings.

[0029] Figure 1 The utility model shows a flash drying feeding system and a use method thereof.

[0030] Specifically, the flash drying feeding system includes a mobile belt conveyor 2, a scattering machine 3, a double screw conveyor 4 and a main tower 5, and is characterized in that a rolling bearing is used at the tail end of the double screw conveyor 4, and the bearing seat 15 is fixed on the outside of the hopper 14 under the main tower instead of directly penetrating into the main tower 5.

[0031] The operation method of the system is as follows: the dried material is unloaded into the upper hopper 1, and then transported by the mobile belt conveyor 2 and enters the disperser 3 to be dispersed and mixed. Specifically, the dried material is first transported to the flap valve receiving hopper 10 by the mobile belt conveyor 2, and then discharged through the heavy hammer flap valve 11, and then enters the disperser 3 to be dispersed and mixed, and finally transported to the outside of the main tower lower hopper 14 through the double screw conveyor 4. Finally, the material enters the main tower 5 through the main tower lower hopper 14 for drying.

[0032] In a specific embodiment, reference Figure 2 The double screw conveyor 4 of the utility model adopts rolling bearings at the tail end, and the bearing seat 15 is fixed on the outside of the hopper 14 under the main tower instead of directly extending into the tower. Since the rolling bearing can be effectively lubricated outside the main tower 5, the service life is much longer than the existing sleeve structure that extends into the main tower 5. It will not bring worn metal impurities into the main tower 5, and there is no problem of materials entering the shaft and sleeve, which makes it difficult to clean. In another specific implementation scheme, refer to Figure 1 b. A material discharge sight glass 13 and an inspection and flushing door 12 are provided on the shell of the dispersing machine 3 to ensure that the working condition of the material in the dispersing machine 3 can be observed at any time, and the material feed amount can be adjusted in time. It can also meet the requirements of cleaning and flushing the dispersing machine 3 and the double screw conveyor 4 after shutdown. A heavy hammer flap valve 11 is added above the double screw conveyor 4 to ensure that the external cold air will not enter the main tower 5 during normal operation, which can avoid heat consumption, reduce steam usage, and maintain good economic benefits. In another specific embodiment, Figure 1 Figure a and Figure 2 As shown, a fluorine skeleton oil seal 16 is provided on the bearing seat 15 of the double screw conveyor 4 for sealing the bearing seat 15 .

[0033] In a specific embodiment, reference Figure 3 and 4 , a nut seat 3-3-4 is welded on the main hollow shaft 3-3 of the scattering machine 3, and the scattering teeth 3-2 are no longer welded with fixed teeth, but movable scattering teeth, that is, end scattering teeth 3-2-1, middle scattering teeth 3-2-2 and tail scattering teeth 3-2-3 are set, which are connected to the nut seat 3-3-4 by threads. When encountering materials with high viscosity, small particle size, and not much need to be scattered, some scattering teeth 3-2 can be disassembled according to the working conditions, and the scattering teeth 3-2 can be shortened or shortened at intervals, which can reduce the workload of the scattering machine 3. When encountering materials with relatively large particle size and loose accumulation that need to be broken, all the scattering teeth 3-2 can be installed according to the actual situation to ensure that the motor is not overloaded. When the scattering teeth need to be repaired or replaced, the part that needs to be replaced can be directly disassembled, and the installation is convenient and quick.

[0034] In a specific embodiment, reference Figure 3 The partial layout of the disintegrator 3, wherein b is the right view of a. The two sides of the main hollow shaft 3-3 of the disintegrator 3 are divided into diaphragm couplings, one end of which is connected to the speed regulating motor shaft by the head diaphragm coupling 3-7, and the other end is connected to the tail short shaft by the tail diaphragm coupling 3-5, and the tail short shaft is fixed by the tail bearing seat 3-6, so that when the main hollow shaft 3-3 needs to be repaired or replaced, it is only necessary to loosen the connecting bolts of the diaphragm coupling to disengage the main hollow shaft 3-3 from the short shafts on both sides, and set movable cover plates 3-4 on both sides of the hopper of the disintegrator 3, and open the movable cover plates 3-4 to have enough space to pull out the main hollow shaft 3-3. A paddle-rotating material level switch 3-1 is provided on the top of the hopper of the disintegrator 3, and the automatic start and stop of the motor of the mobile belt conveyor 2 is controlled by the paddle-rotating material level switch 3-1. When the blades of the paddle-rotating material level switch 3-1 are immersed in the material and cannot rotate, the mobile belt conveyor 2 receives a sensor signal and automatically stops. When the material level drops and the blades of the paddle-rotating material level switch 3-1 cannot contact the material and start to rotate, the mobile belt conveyor 2 receives a signal to start feeding. In this way, the material level is controlled, and there is no need for a dedicated person to guard the material level at the feed port and switch the mobile belt conveyor 2 on and off.

[0035] The above are specific implementation methods of the present invention. Various changes and substitutions can be made to the present invention without violating the spirit and principles of the present invention, and these changes and substitutions are within the protection scope of the present invention.

Claims

1. A flash drying feeding system, comprising a mobile belt conveyor (2), a scattering machine (3), a double screw conveyor (4) and a main tower (5), characterized in that: The tail end of the double screw conveyor (4) adopts a rolling bearing, and the bearing seat (15) is fixed on the outside of the hopper (14) under the main tower without directly penetrating into the main tower (5). The scattering teeth (3-2) of the scattering machine (3) adopt a movable connection.

2. The flash drying feeding system according to claim 1, wherein: A heavy hammer flap valve (11) is arranged above the double screw conveyor (4).

3. The flash drying feeding system according to claim 2, wherein: A material unloading sight glass (13) and an inspection and flushing door (12) are arranged on the housing of the disintegrator (3).

4. The flash drying feeding system according to any one of claims 1 to 3, wherein: A nut seat (3-3-4) is welded on the main hollow shaft (3-3) of the scattering machine (3), and the scattering teeth (3-2) are movably mounted on the nut seat (3-3-4).

5. The flash drying feeding system according to claim 4, wherein: The scattering teeth (3-2) comprise movably connected end scattering teeth (3-2-1), middle scattering teeth (3-2-2) and tail scattering teeth (3-2-3).

6. The flash drying feeding system according to claim 5, wherein: One end of the middle scattering teeth (3-2-2) and the tail scattering teeth (3-2-3) is fixed with a nut seat (3-3-4), and the other end is provided with a corresponding thread, and only one end of the end scattering teeth (3-2-1) is provided with a corresponding thread.

7. The flash drying feeding system according to claim 6, wherein: Diaphragm couplings are installed on both sides of the main hollow shaft (3-3) of the scattering machine (3), one side is a head diaphragm coupling (3-7) connected to the speed regulating motor shaft, and the other side is a tail diaphragm coupling (3-5) connected to the tail short shaft, and the tail short shaft is fixed by a tail bearing seat (3-6).

8. The flash drying feeding system according to claim 7, wherein: Movable cover plates (3-4) are arranged on both sides of the hopper of the disintegrator (3).

9. The flash drying feeding system according to claim 8, wherein: A rotary paddle type material level switch (3-1) is arranged on the top of the hopper of the disintegrator (3).

10. The flash drying feeding system according to claim 9, wherein: It also includes an upper hopper (1) and a flap valve receiving hopper (10).

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