An automated homogenization warehousing system for poorly flowing solid materials

Abstract

The application discloses an automatic homogenizing storage system for solid materials with poor fluidity, which comprises a feeding system, a stock bin system, a stock bin bottom material taking system and the like, and a plurality of screw material pushers for pushing the materials into a mixing pipe are arranged at different horizontal positions of the mixing pipe. Since the application adopts a mechanical mode to simultaneously take materials at multiple points in space, the random mixing of the materials is strengthened, and therefore the homogenizing efficiency of the system is high, the homogenizing effect is good, the degree of automation is high, and the system is compact in structure and good in environmental protection effect.

Description

TECHNICAL FIELD

[0001] The present application relates to a large-scale automatic homogenization warehouse system suitable for solid materials with poor fluidity and uneven particle distribution, mainly suitable for chemical, metallurgical, building material, environmental protection and other industries, belonging to the field of solid processing technology. BACKGROUND

[0002] The material homogenization system is a device for mixing and uniformly distributing materials in the production process. The material homogenization system is widely used in various industrial production, such as chemical industry, building materials, metallurgy, environmental protection and other fields. In these fields, different materials need to be mixed together to make the composition and particle size distribution uniform to meet the production requirements. With the development of industrial automation, more and more enterprises begin to introduce material homogenization system to realize the automation of production process. The material homogenization system can realize automatic mixing and distribution through computer control, improve production efficiency and quality. The material homogenization system can effectively reduce manual operation and material waste, thereby reducing production cost, and also can reduce fluctuations in the production process due to material influence, making the equipment run more smoothly.

[0003] At present, the large-scale material homogenization system widely used in domestic and foreign industrial projects mainly has the following three types:

[0004] 1) Through the stacking of layered materials and simultaneous material taking;

[0005] 2) Gravity homogenization;

[0006] 3) Pneumatic homogenization;

[0007] The method of stacking layered materials and taking materials simultaneously theoretically requires that the material layers are parallel and overlap, and the thickness is consistent. In actual operation, due to the actual feasibility and economic reasons of the equipment, only the approximate uniform and consistent paving method can be used. According to the conditions of the equipment and the requirements of homogenization, there are herringbone stacking method, wave-shaped method, horizontal layer method, transverse inclined layer method, longitudinal inclined layer method, and continuous stacking method combining herringbone and longitudinal inclined layer.

[0008] This method is to realize the homogenization of different materials by taking the layered materials at the same time.

[0009] This method has large occupation area, low automation degree, poor environmental protection effect, and significant material particle segregation, with more large particles on both sides and bottom of the material pile, and poor homogenization effect.

[0010] The common application scene is the raw material homogenization yard in the metallurgical industry. The purpose of homogenization is achieved by repeatedly stacking coal or limestone in multiple layers and taking materials at the same time. The homogenization effect is poor, and it is suitable for occasions with low requirements for homogenization effect.

[0011] Gravity homogenization relies on the gravity flow of the material in the bin to achieve homogenization, and different backflow times are used to achieve the required uniformity. If the homogenization effect is not too strict, continuous homogenization can also be achieved without backflow. The flow pattern of the material in the bin can be divided into two categories, namely bulk flow and funnel flow. In the bulk flow bin, the flow speed of the material in the straight cylinder part of the bin is basically the same, while the flow speed in the lower cone part is different, with faster flow in the middle and slower flow near the wall. This speed gradient causes the material to be sheared and mixed in the bin.

[0012] Since the general bulk flow bin only produces a speed difference in the lower hopper part, the homogenization capacity is not strong, and it is mainly used for large-scale blending operations of catalysts, plasticizers, electrolytic manganese dioxide, etc. It can be used to mix and homogenize different batches of single varieties, so that the moisture, particle distribution, composition, viscosity, etc. of the material are uniform, and it is suitable for powders with good flowability.

[0013] Pneumatic homogenization first uniformly lays the material in layers in the bin. When the central mixing chamber is circulated and aerated, multiple funnel recesses appear in turn above the outer ring zone cone hole. The funnels are arranged in a row along the radial direction and rotate at different angles with the change of air supply. This not only produces gravity mixing, but also causes radial mixing of the raw material at the bottom of the bin due to the different unloading speeds of the funnels. The material enters the central mixing chamber and is subjected to strong stirring by the aerated gas flow in the mixing chamber under the action of the pressure reduction cone, so that the raw material that has been mixed and homogenized in the outer ring zone is subjected to a second full pneumatic mixing. Therefore, the air supply in the outer ring zone of the bin is to activate the material to form a funnel flow and transport the material to the mixing chamber in the cone. The air supply in the inner ring of the cone is to fully homogenize and mix the material and unload it from the bin. The homogenized material is unloaded from the overflow pipe at the bottom of the bin under normal operation, thus completing the entire homogenization process of the raw material.

[0014] Pneumatic homogenization uses the energy of compressed air to make the powder flow in a fluidized state, thereby achieving blending and homogenization. Its characteristics are large handling capacity, high energy consumption, and large end gas-solid separation device, which is prone to particle segregation. Common application scenarios are cement raw material homogenization bins, which are suitable for powders with good flowability and uniform particle size distribution.

[0015] In the application scenario of mixing solid waste melting in the environmental protection industry, the uneven surface of solid particles, high moisture content, and uneven particle size distribution pose challenges to the mixing process. Traditional gravity homogenization methods cannot effectively form a funnel-shaped movement, while pneumatic homogenization can cause particle size separation, affecting the mixing efficiency and effectiveness. Therefore, new solutions are needed to overcome these problems and improve the mixing efficiency and quality of such materials. SUMMARY

[0016] The technical problem to be solved by the present application is how to mix a large amount of high-precision solid materials in an industrial project under the condition that the particles have poor flowability and uneven particle size distribution.

[0017] To solve the above problems, the present application provides an automatic homogenization warehouse system for solid materials with poor flowability, which comprises:

[0018] A feeding system comprising a double-path elevator and a double-path material conveyor, wherein the double-path elevator is in one-to-one correspondence with the two pipes of the double-path material conveyor;

[0019] A silo system comprising four flat-bottom silos, namely a homogenization silo, a buffer silo, a first homogenization finished product silo, and a second homogenization finished product silo, wherein the top of each flat-bottom silo is in communication with one of the two pipes of the double-path material conveyor, and the homogenization silo is provided with a mixing pipe extending to the bottom of the homogenization silo, and the bottom end of the mixing pipe is connected with a bifurcated pipe;

[0020] A bottom material taking system comprising two reversible conveyors in communication with the bottom of all flat-bottom silos, wherein the two pipes of the bifurcated pipe are in communication with the two reversible conveyors, respectively, and one end of each reversible conveyor is in communication with one of the two pipes of the double-path elevator, and the other end is in communication with a downstream equipment.

[0021] Preferably, each flat-bottom silo is provided with a high material level meter and a low material level meter, and is provided with an analytical sampling port at different heights and horizontal positions.

[0022] Preferably, the mixing pipe is connected with multiple layers of different horizontal positions, and each layer is provided with at least one screw pusher, and each screw pusher rotates around the axis of the mixing pipe; three screw pushers in each layer are uniformly arranged on the circumferential surface with the axis of the mixing pipe as the center, and the projections of all screw pushers on the circumferential surface with the axis of the mixing pipe as the center are uniformly arranged.

[0023] Preferably, the top of each screw pusher is provided with an inverted V-shaped pressure relief plate, and the two ends of the inverted V-shaped pressure relief plate are connected with the inner wall of the homogenization silo and the mixing pipe, respectively.

[0024] More preferably, the opening angle of the inverted V-shaped pressure relief plate is 60°.

[0025] Preferably, each pipe of the bifurcated pipe is provided with a plug valve.

[0026] Preferably, the automatic homogenization warehouse system further comprises a dust removal system.

[0027] More preferably, the dust removal system comprises a bag dust collector provided at the top of each flat-bottom silo and equipped with an exhaust fan. The system is operated under negative pressure through the bag dust collector to prevent dust overflow.

[0028] Preferably, the double-path elevator continuously receives materials from the upstream system through one path of the double-path material conveyor, and the other path is used for returning materials from the flat-bottom silo to the top of the silo during the homogenization process, and the two paths can be switched with each other.

[0029] Preferably, the end of the screw away from the mixing pipe is fixed through a maintenance track. For easy maintenance, the track is used to fix the end of the screw outside the silo, and the end of the screw inside the silo is not fixed. When maintenance is needed, the screw can be slid out along the track.

[0030] Since the present application adopts a mechanical method to simultaneously take materials at multiple points in space, the random mixing of materials is strengthened, and therefore the homogenization efficiency of the present system is high and the mixing effect is good. After the homogenization is completed, the materials are taken out through the sampling port and are qualified after testing, and then the materials in the homogenization silo are "transferred" into the homogenization finished product silo through the bottom material taking system and the feeding system. The buffer silo is the same as the two homogenization finished product silos, and its function can be switched through the control system. The buffer silo is used to receive materials from the upstream system during homogenization.

[0031] Compared with the prior art, the present application has the following advantages:

[0032] High homogenization efficiency: the present application adopts a mechanical method to push the materials in the silo into the central mixing pipe in multiple horizontal and vertical directions, and then the mixed materials are sent to the elevator through the reversible conveyor, and then are returned to the homogenization silo through the top material conveyor. Compared with the gravity type homogenization silo which realizes the mixing of material layers through the asymmetric flow of materials, the present application realizes the direct mixing of multiple layers of materials and also has the condition of moving the materials from top to bottom to mix the layers, and therefore the homogenization efficiency is better than that of the gravity type homogenization silo.

[0033] Good homogenization effect: after the materials are homogenized by the present system, the moisture and composition deviation of the materials in the silo at different heights and different horizontal positions can be controlled within 1%, which is better than the 30% deviation of the stockyard homogenization, the 15% deviation of the pneumatic homogenization, and the 10% deviation of the gravity type homogenization silo. Moreover, the particle size of the materials will not be layered.

[0034] High degree of automation: the equipment of the present system adopts an automatic program control system, which can intelligently control and monitor the entire homogenization system, and can realize the functions of automatic homogenization, transfer, incoming material buffering, and discharging through the set program.

[0035] Compact structure: the present system has the functions of feeding buffering, homogenization, and storage in one, and has a small footprint.

[0036] Good environmental protection effect: all the equipment of the present system adopts a sealed shell, and a bag-type dust collector with a strong exhaust fan is arranged at the top of the homogenization silo, so that the entire system operates in a negative pressure state to prevent dust from overflowing. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 Schematic diagram of automatic homogenization warehouse system provided by the present application;

[0038] Figure 2 Schematic diagram of arrangement of first layer screw feeders;

[0039] Figure 3 Schematic diagram of arrangement of second layer screw feeders;

[0040] Figure 4 Schematic diagram of arrangement of third layer screw feeders;

[0041] Figure 5 Schematic diagram of arrangement of fourth layer screw feeders;

[0042] Figure 6 Schematic diagram of projection of all screw feeders;

[0043] Figure 7 Schematic diagram of position of inverted V-shaped pressure relief plate;

[0044] Figure 8 Partial enlarged view of Figure 7 ;

[0045] Figure 9 Schematic diagram of A direction in Figure 8 . DETAILED DESCRIPTION

[0046] In order to make the present application more apparent and easy to understand, a preferred embodiment is described in detail below with reference to the accompanying drawings.

[0047] EMBODIMENT

[0048] As shown in Figure 1 , an automatic homogenization warehouse system for solid materials with poor fluidity provided by the present application comprises:

[0049] A feeding system comprising a double-path elevator 1 and a double-path material conveyor 2, the double-path elevator 1 and the double-path material conveyor 2 being in one-to-one correspondence with two pipes of the double-path material conveyor 2;

[0050] A bin system comprising four flat-bottom bins, namely a homogenization bin 3, a buffer bin 4, a first homogenization finished product bin 5, and a second homogenization finished product bin 6; the top of each of the four flat-bottom bins is in communication with one of the two pipes of the double-path material conveyor 2; the homogenization bin 3 is provided with a mixing pipe 7 extending to the bottom of the homogenization bin 3, multiple screw feeders 8 for pushing materials into the mixing pipe 7 are arranged at different horizontal positions on the mixing pipe 7, and the bottom end of the mixing pipe 7 is connected with a bifurcated pipe, two pipes of the bifurcated pipe are respectively provided with plug valves;

[0051] The bin bottom material taking system comprises two reversible conveyors 9 in communication with the bottom of all flat bottom silos, two pipe lines of the bifurcated pipe are in communication with the two reversible conveyors 9 respectively; one end of the two reversible conveyors 9 is in communication with the two pipe lines of the double-path elevator 1 respectively, and the other end is in communication with the downstream equipment;

[0052] The dust removal system comprises a bag dust collector with a blower arranged at the top of each flat bottom silo.

[0053] The double-path elevator 1 and one path of the double-path material conveyor 2 continuously receive the material from the upstream system, and the other path is used for returning the material from the flat bottom silo to the top of the silo (external circulation material returning system) in the homogenization process, and the two paths can be switched with each other.

[0054] A high material level meter and a low material level meter are arranged in each flat bottom silo, and analysis sampling ports are arranged at different heights and horizontal positions.

[0055] The mixing pipe 7 is connected with four layers of different horizontal positions, and each layer is provided with three screw pushers 8, each screw pusher 8 rotates around the axis of the mixing pipe 7; the three screw pushers 8 in each layer are uniformly arranged on the circumferential surface with the axis of the mixing pipe 7 as the center, and the projections of all the screw pushers 8 on the circumferential surface with the axis of the mixing pipe 7 as the center are uniformly arranged. Figures 2-6 As shown in the top view, any one screw pusher 8 in the first layer is taken as the reference, that is, the angle is 0°, then the included angle of any one screw pusher 8 in the second layer with respect to the screw pusher 8 in the first layer is counterclockwise 30°, the included angle of any one screw pusher 8 in the third layer with respect to the screw pusher 8 in the first layer is counterclockwise 60°, and the included angle of any one screw pusher 8 in the second layer with respect to the screw pusher 8 in the first layer is counterclockwise 120°. Figure 6 As shown in the top view, the included angle of the two adjacent screw pushers 8 is 30°.

[0056] The end of the screw pusher 8 away from the mixing pipe 7 is fixed through the maintenance track 11.

[0057] In order to prevent the material M from being too heavy to rotate the screw pusher 8, and also to facilitate the screw pusher 8 to take material along the horizontal direction, a reverse V-shaped pressure relief plate 10 is arranged above each screw pusher 8 (as shown in Figures 7-9The opening angle of the inverted V-shaped pressure relief plate 10 is 60°. The two ends of the inverted V-shaped pressure relief plate 10 are respectively welded to the inner wall of the homogenizing bin 3 and the mixing pipe 7. The inverted V-shaped pressure relief plate 10 is made of carbon steel, and the length is equal to the horizontal screw, and the width is slightly narrower than the horizontal screw. The inverted V-shaped pressure relief plate 10 has the following effects: on the one hand, it prevents the weight of the upper material from being entirely pressed on the screw pusher 8, thereby preventing the screw pusher 8 from being broken and stuck due to excessive resistance; on the other hand, it ensures that there is a certain space above the screw pusher 8 that is not filled with material, so that the material far from the center of the mixing pipe 7 can be pushed horizontally to the mixing pipe 7.

[0058] The multiple-layer screws in the homogenizing bin run simultaneously to push the material in the vertical and horizontal directions into the mixing pipe, and the mixing of the material in multiple vertical and horizontal planes is completed in the mixing pipe. The mixed material enters the bottom reversible conveyor through the distributor, and is returned to the double-path elevator of the feeding system through the reversible conveyor. The mixed material can be returned to the homogenizing bin through the top material distribution conveyor by external circulation. After multiple cycles, the purpose of homogenizing the material in the flat-bottom bin is achieved.

[0059] The two sets of bin bottom discharge / return systems and the feeding and distribution systems can be continuously fed in one set. One set of continuous external circulation or mixing of external circulation material with feeding into the bin can be operated in addition to the homogenization function, which also realizes the functions of reversing the warehouse and storage.

[0060] The double-path operation of the entire system can adapt to continuous / discontinuous operation, and when one path fails, it can ensure uninterrupted supply of material. The elevator equipment and the bin bottom reversible conveyor function are multiplexed, which can be used as feeding (discharging) equipment, and also as external circulation and warehouse reversing equipment.

Claims

1. An automated homogenization and storage system for solid materials with poor flowability, characterized in that, include: The feeding system includes a dual-path elevator (1) and a dual-path fabric conveyor (2), wherein the two pipelines of the dual-path elevator (1) and the dual-path fabric conveyor (2) are connected one-to-one; The silo system includes four flat-bottomed silos, namely a homogenization silo (3), a buffer silo (4), a first homogenization finished product silo (5), and a second homogenization finished product silo (6); the tops of the four flat-bottomed silos are respectively connected to two pipelines of the dual-path material conveyor (2); the center of the homogenization silo (3) is provided with a mixing pipe (7) extending to the bottom of the homogenization silo (3), and multiple spiral pushers (8) for pushing materials into the mixing pipe (7) are provided at different horizontal positions on the mixing pipe (7); the bottom end of the mixing pipe (7) is connected to a branch pipe; The bottom material handling system includes two reversible conveyors (9) connected to the bottom of all flat-bottomed silos. The two branches of the branch pipe are connected to the two reversible conveyors (9) respectively. One end of the two reversible conveyors (9) is connected to the two branches of the double-path elevator (1), and the other end is connected to the downstream equipment.

2. The automated homogenization storage system as described in claim 1, characterized in that, Each of the aforementioned flat-bottomed silos is equipped with a high-level gauge and a low-level gauge, and has analysis sampling ports at different heights and horizontal positions.

3. The automated homogenization storage system as described in claim 1, characterized in that, The mixing tube (7) is connected to multiple layers of spiral pushers (8) at different horizontal positions, with at least one spiral pusher (8) in each layer. Each spiral pusher (8) rotates around the axis of the mixing tube (7). The three spiral pushers (8) in each layer are evenly arranged on the circumferential surface centered on the axis of the mixing tube (7), and the projections of all spiral pushers (8) are evenly arranged on the circumferential surface centered on the axis of the mixing tube (7).

4. The automated homogenization storage system as described in claim 1 or 3, characterized in that, Each of the spiral feeders (8) is provided with an inverted V-shaped pressure reducing plate (10) above it; the two ends of the inverted V-shaped pressure reducing plate (10) are respectively connected to the inner wall of the homogenization silo (3) and the mixing pipe (7).

5. The automated homogenization storage system as described in claim 4, characterized in that, The inverted V-shaped pressure relief plate (10) has an unfolding angle of 60°.

6. The automated homogenization storage system as described in claim 1, characterized in that, The two pipes of the branch pipe are each equipped with a gate valve.

7. The automated homogenization storage system as described in claim 1, characterized in that, It also includes a dust removal system.

8. The automated homogenization storage system as described in claim 7, characterized in that, The dust removal system includes a bag filter with an exhaust fan installed on top of each flat-bottomed silo.

9. The automated homogenization storage system as described in claim 1, characterized in that, One of the dual-path elevators (1) and dual-path material conveyors (2) continuously receives materials from the upstream system, while the other path is used to return materials from the flat-bottomed silo to the top of the silo during the homogenization process. The two paths can be switched between each other.

10. The automated homogenization storage system as described in claim 1, characterized in that, The end of the spiral feeder (8) away from the mixing pipe (7) is fixed by the maintenance rail (11).

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