A material conveying system

Abstract

The utility model discloses a material conveying system. Including: first screening machine is equipped with first discharge gate and second discharge gate, first material pipe, its feed port is connected with first discharge gate, first crusher, its feed port is connected with the discharge gate of first material pipe, second crusher, its feed port is connected with second discharge gate, second screening machine, its feed port is connected with the discharge gate of first crusher and the discharge gate of second crusher, conveyer belt, it conveys the particle that passed through second screening machine to target area, storage component, it includes first storage bin, and with first material pipe is connected through second material pipe, and shunt valve, it includes motor and baffle, installs in first material pipe inside, and is located second material pipe opening place. The utility model discloses through setting up shunt valve, reasonably adjusts the coal amount that enters first storage bin and is sent into combustion furnace, thereby reduces the input of coal when the power generation load is lower, and simultaneously makes full use of the productivity of screening machine and crusher.

Description

Technical Field

[0001] This utility model relates to the field of bulk material conveying and screening, and in particular to a material conveying system. Background Technology

[0002] In the field of thermal power generation, the stable and efficient transportation and pretreatment of coal are key links to ensure the safe and economical operation of boilers. Before being fed into the furnace for combustion, raw coal usually needs to be screened to separate qualified coal particles that meet the feed particle size requirements of the coal mill, and oversized pieces are sent to the second crusher for processing.

[0003] However, existing technologies often employ single-stage screening or simple series screening-crushing processes, directly conveying qualified coal particles to downstream systems. When boiler load fluctuations necessitate adjustments to the coal feed rate, the lack of flexible means to control the flow rate of qualified coal particles makes it difficult for the system to respond quickly to load changes, affecting combustion stability and efficiency.

[0004] While existing improvement schemes attempt to introduce storage silos or bypass designs to buffer flow, certain shortcomings remain. The main issue is that the current diversion methods using fixed tees or simple gate valves suffer from poor accuracy and are prone to clogging, failing to achieve dynamic adjustment of qualified coal particles between the main conveying path and the storage silos. Furthermore, the lack of a closed-loop design linked to upstream supply prevents automatic material replenishment. Utility Model Content

[0005] To address the above issues and overcome the shortcomings of existing technologies, this invention designs a material conveying system with diversion and buffer storage functions, specifically considering the fluctuating coal flow demand of thermal power plants. By incorporating a diversion valve, this invention rationally adjusts the amount of coal entering the first storage silo and being fed into the combustion furnace when coal demand is low, thereby reducing coal input during periods of low power generation load while fully utilizing the capacity of the screening machine and the second crusher. This system features a simple structure, stable operation, effectively improved fuel utilization efficiency, reduced equipment idling rate, and enhanced adaptability to load changes, demonstrating significant practicality and potential for widespread adoption.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] This utility model provides a material conveying system, including:

[0008] The first screening machine is provided with a first discharge port for sieved particles to pass through and a second discharge port for unsieved particles to pass through.

[0009] The first feed pipe has its inlet connected to the first outlet of the first screening machine.

[0010] The first crusher has its feed inlet connected to the discharge outlet of the first guide pipe;

[0011] The second crusher has its feed inlet connected to the second discharge outlet of the first screening machine;

[0012] The second screening machine has its inlet connected to the outlet of the first crusher and the outlet of the second crusher.

[0013] A conveyor belt that transports particles through a second screening machine to a target area;

[0014] A material storage assembly, the material storage assembly including a first material storage bin, the first material storage bin being connected to the first material guide pipe through a second material guide pipe;

[0015] The diversion valve includes a motor and a baffle. The diversion valve is installed inside the first guide pipe and located at the opening of the second guide pipe.

[0016] Specifically, when the baffle of the diversion valve is in close contact with the inner wall of the first feed pipe, all the particles in the first feed pipe enter the second screening machine along the first feed pipe; when the baffle of the diversion valve separates from the inner wall of the first feed pipe, that is, when the feed inlet of the second feed pipe is opened, some of the particles in the first feed pipe enter the first storage bin along the second feed pipe, and the remaining part enters the second screening machine along the first feed pipe.

[0017] The material conveying system further includes:

[0018] The feeding assembly includes:

[0019] The second storage bin is connected to the first screening machine;

[0020] The elevator has its inlet connected to the first storage bin and its outlet connected to the second storage bin.

[0021] Furthermore, the second storage bin is connected to the first screening machine via a third feed pipe, and a one-way valve is provided at the outlet of the third feed pipe; the one-way valve only allows particles to move from the second storage bin to the first screening machine.

[0022] Furthermore, the elevator is a screw conveyor, which consists of a fourth guide pipe and screw blades driven by a motor.

[0023] Furthermore, the first feed tube further includes:

[0024] An upstream pipeline, the inlet of which is connected to the first outlet of the first screening machine;

[0025] An electromagnetic valve, the upper end of which is connected to the outlet of the upstream pipeline;

[0026] Downstream pipeline, the inlet of which is connected to the lower end of the solenoid valve;

[0027] The second feed pipe of the storage assembly is connected to the downstream pipe; the diversion valve is installed in the downstream pipe.

[0028] Furthermore, the first screening method is a vibrating screen.

[0029] Furthermore, the screen aperture of the first screening machine is no greater than 12mm.

[0030] Furthermore, the second screening machine is a roller screening machine.

[0031] Furthermore, the screen aperture of the second screening machine is no greater than 8mm.

[0032] This utility model has at least the following advantages or beneficial effects:

[0033] (1) When the power generation load is low, this utility model achieves effective diversion of the coal after it has been screened by the first screening machine by adjusting the angle of the baffle in the diversion valve. Part of the coal is guided into the first storage bin for temporary storage and does not participate in the current combustion power generation process; the other part of the coal is directly fed into the combustion furnace for combustion power generation via a conveyor belt. In this way, the amount of coal entering the first storage bin and fed into the combustion furnace can be reasonably adjusted according to the actual power generation demand, thereby effectively reducing the amount of coal input when the power generation load is low, while making full use of the capacity of the screening machine and the second crusher, and avoiding equipment idling or resource waste.

[0034] (2) When the power generation load is high, this invention re-transports the coal temporarily stored in the first storage bin to the first screening machine. Since this coal has already undergone screening and crushing, it can enter the combustion furnace more quickly and efficiently to participate in the combustion and power generation process. At this time, only the power of the hoist of the feeding component in this invention needs to be adjusted appropriately to meet the increased coal demand, without increasing the workload of the entire transportation system source, effectively improving the system's operating efficiency and flexibility. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the material conveying system of this utility model;

[0037] Figure 2 A schematic diagram of the material conveying system under full-load operation of the combustion furnace;

[0038] Figure 3 A schematic diagram of the material conveying system for a combustion furnace operating under underload conditions;

[0039] Figure 4 A schematic diagram of the material conveying system for a combustion furnace operating under overload conditions;

[0040] Figure label:

[0041] 1-First screening machine; 11-First discharge port; 12-Second discharge port;

[0042] 2-First feed pipe; 21-Upstream pipe; 22-Solenoid valve; 23-Downstream pipe;

[0043] 3-First crusher;

[0044] 4-Second crusher;

[0045] 5-Second screening machine;

[0046] 6-Conveyor belt;

[0047] 7-Storage assembly; 71-First storage bin; 72-Second feed pipe;

[0048] 8-Flow divider valve; 81-Motor; 82-Baffle;

[0049] 9-Feeding assembly; 91-Second storage bin; 92-Elevator; 921-Fourth guide pipe; 922-Spiral blade; 93-Third guide pipe; 931-Check valve; Detailed Implementation

[0050] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0051] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0052] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0053] In this utility model, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of the structural relationship of the various parts or elements of this utility model and do not specifically refer to any part or element in this utility model. They should not be construed as limiting this utility model.

[0054] In this utility model, terms such as "fixed", "connected", and "linked" should be interpreted broadly, indicating that it can be a fixed connection, an integral connection, or a detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. For relevant scientific researchers or technicians in this field, the specific meaning of the above terms in this utility model can be determined according to the specific circumstances, and should not be construed as a limitation of this utility model.

[0055] The embodiments of this utility model will be described in detail below.

[0056] This utility model discloses a material conveying system, which has the functions of screening, crushing, transporting and storing materials.

[0057] In this embodiment, the system is used to supply fuel coal to the combustion furnace of a thermal power plant. This embodiment mainly includes: a first screening machine 1, a first feed pipe 2, a first crusher 3, a second crusher 4, a second screening machine 5, a conveyor belt 6, a storage assembly 7, a diversion valve 8, and a feeding assembly 9. Specific details are as follows:

[0058] Figure 1 This is a schematic diagram of the material conveying system structure in this embodiment.

[0059] The first screening machine 1 has two discharge ports: a first discharge port 11, which provides a channel for small particles that pass through the screen; and a second discharge port 12, which provides a channel for larger particles that do not pass through the screen. The first screening machine 1 can be a vibrating screen or a roller screen. In this embodiment, the first screening machine 1 is a vibrating screen with a screen aperture of no more than 12 mm. Therefore, after granular coal enters through the feed port of the first screening machine 1, granular coal with a diameter less than 12 mm exits through the first discharge port 11; granular coal with a diameter greater than 12 mm exits through the second discharge port 12.

[0060] The first discharge port 11 of the first screening machine 1 is connected to the upper end of the first guide pipe 2. The first guide pipe 2 includes: an upstream pipe 21, which is truncated cone-shaped with a larger upper end and a smaller lower end, and its upper end is connected to the first discharge port 11; a solenoid valve 22, whose inlet is connected to the lower end of the upstream pipe 21; and a downstream pipe 23, whose upper end is connected to the discharge port of the solenoid valve 22. The upstream pipe 21, the solenoid valve 22, and the downstream pipe 23 together form a first guide pipe 2 that has both guiding and controlling material flow. In this way, the flow rate of coal passing through the first guide pipe 2 can be controlled simply by operating the solenoid valve 22.

[0061] Furthermore, the function of controlling the flow rate mainly relies on the structure of the solenoid valve 22 itself, rather than the location of the solenoid valve 22. Therefore, in other embodiments where flow rate control is required, the first feed pipe 2 may only include one of the upstream pipe 21 or the downstream pipe 23; in other embodiments where flow rate control is not required, the first feed pipe 2 does not necessarily include the solenoid valve 22, that is, the first feed pipe 2 can be an ordinary pipe.

[0062] The lower end of the first feed pipe 2 is connected to the first crusher 3, which further crushes granular coal with a diameter of less than 12mm, further reducing the particle diameter and ultimately making the coal burn more completely.

[0063] In addition, the second discharge port 12 of the first screening machine 1 is connected to the second crusher 4 through a pipeline. This further crushes granular coal with a diameter greater than 12mm, further reducing the particle diameter and ultimately making the coal burn more completely.

[0064] The first crusher 3 and the second crusher 4 can be either impact crushers or reversible hammer crushers. In this embodiment, the first crusher 3 is an impact crusher; the second crusher 4 is a reversible hammer crusher.

[0065] The discharge ports of the first crusher 3 and the second crusher 4 are connected to the feed port of the second screening machine 5. The second screening machine 5 can be a vibrating screen or a roller screen. In this embodiment, the second screening machine 5 is a roller screen, and its screen aperture is no greater than 8mm.

[0066] The granular coal screened out by the second screening machine 5 falls onto the conveyor belt 6 and is then conveyed into the combustion furnace.

[0067] Furthermore, this embodiment also includes a storage assembly 7 with storage function. The storage assembly 7 includes a first storage bin 71 and a second guide pipe 72. The second guide pipe 72 is connected to the first storage bin 71 and is connected to the downstream pipe 23 of the first guide pipe 72. A diversion valve 8 is also provided inside the downstream pipe 23 and at the opening of the second guide pipe 72. The diversion valve 8 is a rotatable valve composed of a motor 81 and a baffle 82.

[0068] Therefore, in this embodiment, there can be the following two working states:

[0069] When the combustion furnace is running at full load, the amount of coal required for combustion is equal to the rated production capacity of the material conveying system, such as... Figure 2 As shown. At this time, the baffle 82 of the diversion valve 8 is tightly attached to the inner wall of the downstream pipe 23. Therefore, the feed inlet of the second feed pipe 72 is in a closed state. The coal inside the first feed pipe 2 falls into the first crusher 3 through the first screening machine 1, and enters the combustion furnace after subsequent processing.

[0070] When the combustion furnace is operating under underload, the amount of coal required for combustion is less than the rated production capacity of the material conveying system, such as... Figure 3 As shown, at this time, the motor 81 of the diversion valve 8 drives the baffle 82 to rotate into the downstream pipe 23. As a result, the feed inlet of the second feed pipe 72 is open. Part of the coal inside the first feed pipe 2 falls onto the baffle 82, then slides through the second feed pipe 72, and finally enters the first storage bin 71; the other part falls into the first crusher 3, and after further processing, enters the combustion furnace.

[0071] In this embodiment, the motor 81 of the diversion valve 8 can drive the baffle 82 to rotate to different positions. Therefore, the granular coal falling in the first feed pipe 2 can be diverted to different degrees according to the actual coal demand, thereby controlling the final amount entering the combustion furnace. In this way, when the combustion furnace is operating under underload and the amount of coal required for combustion is less than the rated production capacity of the material conveying system, the amount of coal added to the combustion furnace can be reduced, and the production power of the material conveying system can be fully utilized, thereby avoiding equipment idling or resource waste.

[0072] In addition, this embodiment also includes a feeding assembly 9, which includes a second storage bin 91, an elevator 92, and a third guide pipe 93. The second storage bin 91 is a temporary intermediary structure connecting the first storage bin 71 and the first screening machine 1. The elevator 92 is a mechanism for transferring and lifting materials, and can be a belt conveyor, a screw conveyor, or a pneumatic conveying device. In this embodiment, the elevator 92 is a screw conveyor. The elevator 92 includes a fourth guide pipe 921 and a helical blade 922 driven by a motor. The inlet of the elevator 92 extends into the bottom of the first storage bin 71, and the outlet is connected to the second storage bin 91. In this way, the elevator 92 can be used to transport coal in the first storage bin 71 to the second storage bin 91. The coal in the second storage bin 91 enters the first screening machine 1 through the third guide pipe 93. Near the discharge port of the third feed pipe 93, there is also a one-way valve 931 that only allows coal to move from the second storage bin 91 to the first screening machine 1.

[0073] Therefore, in this embodiment, the following working state can also be achieved:

[0074] When the combustion furnace is operating under overload, the amount of coal required for combustion exceeds the rated production capacity of the material conveying system, such as... Figure 4 As shown. At this time, the feeding assembly 9 continuously moves the processed coal from the first storage bin 71 back into the first screening machine 1. The baffle 82 of the diversion valve 8 is tightly pressed against the inner wall of the downstream pipe 23, and the inlet of the second guide pipe 72 is closed. Therefore, the coal inside the first guide pipe 2 falls from the first screening machine 1 into the first crusher 3, and after further processing, enters the combustion furnace. This satisfies the requirements of the combustion furnace during overload operation. Since the coal in the first storage bin 71 is already processed, adding it back into the material conveying system does not significantly increase the system's workload.

[0075] In addition, an electromagnetic valve 22 is provided on the first feed pipe 2 in this embodiment. Therefore, for the above three situations, the electromagnetic valve 22 can be opened when it is necessary to control the flow rate of coal in the first feed pipe 2, so that the material conveying system can be compatible with more application scenarios.

[0076] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A material conveying system, characterized in that, include: The first screening machine (1) is provided with a first discharge port (11) for passing through the screened particles and a second discharge port (12) for passing through the unscreened particles. The first feed pipe (2) is connected to the first discharge port (11) of the first screening machine (1); The first crusher (3) has its feed inlet connected to the discharge outlet of the first guide pipe (2); The second crusher (4) has its feed inlet connected to the second discharge outlet (12) of the first screening machine (1); The inlet of the second screening machine (5) is connected to the outlet of the first crusher (3) and the outlet of the second crusher (4); Conveyor belt (6) conveys particles through the second screening machine (5) to the target area; The storage assembly (7) includes a first storage bin (71), which is connected to the first guide pipe (2) via a second guide pipe (72). Diverter valve (8), which includes a motor (81) and a baffle (82), is installed inside the first feed pipe (2) and located at the opening of the second feed pipe (72); When the baffle (82) of the diversion valve (8) is close to the inner wall of the first guide pipe (2), all the particles in the first guide pipe (2) enter the second screening machine (5) along the first guide pipe (2); when the baffle (82) of the diversion valve (8) is separated from the inner wall of the first guide pipe (2), that is, when the feed port of the second guide pipe (72) is opened, some of the particles in the first guide pipe (2) enter the first storage bin (71) along the second guide pipe (72), and the remaining part enters the second screening machine (5) along the first guide pipe (2).

2. The material conveying system according to claim 1, characterized in that, Further includes: The feeding assembly (9) includes: The second storage bin (91) is connected to the first screening machine (1); The elevator (92) has its inlet connected to the first storage bin (71) and its outlet connected to the second storage bin (91).

3. The material conveying system according to claim 2, characterized in that, The second storage bin (91) is connected to the first screening machine (1) through the third guide pipe (93), and a one-way valve (931) is provided at the outlet of the third guide pipe (93); the one-way valve (931) only allows particles to move from the second storage bin (91) to the first screening machine (1).

4. The material conveying system according to claim 2, characterized in that, The elevator (92) is a screw conveyor, which consists of a fourth guide pipe (921) and a screw blade (922) driven by a motor.

5. The material conveying system according to claim 1, characterized in that, The first feed tube (2) further includes: Upstream pipe (21), the inlet of which is connected to the first outlet (11) of the first screening machine (1); Electromagnetic valve (22), the upper end of which is connected to the outlet of the upstream pipe (21); Downstream pipe (23), the inlet of which is connected to the lower end of the solenoid valve (22); The second feed pipe (72) of the storage assembly (7) is connected to the downstream pipe (23); the diversion valve (8) is installed in the downstream pipe (23).

6. The material conveying system according to claim 1, characterized in that, The first screening machine (1) is a vibrating screening machine.

7. The material conveying system according to claim 6, characterized in that, The screen aperture of the first screening machine (1) is no greater than 12mm.

8. The material conveying system according to claim 1, characterized in that, The second screening machine (5) is a roller screening machine.

9. The material conveying system according to claim 8, characterized in that, The screen aperture of the second screening machine (5) is no greater than 8mm.

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