Metal removal system for coal belt conveyor

Abstract

The utility model relates to a metal removal system for a coal belt conveyor, which is characterized in that a disc type electromagnetic iron remover, a metal detector and a lateral coal output mechanism are sequentially arranged right above a conveying belt in the coal flow direction from front to back; the temporary coal storage hopper for manual impurity removal is arranged outside one side of a supporting frame of the coal conveying belt conveyor and located right below a coal outlet of the lateral coal output mechanism, and a coal locking baffle is arranged at a discharging opening in the lower end of the temporary coal storage hopper. The auger type coal returning mechanism is obliquely arranged front and back, and a feeding hole is formed in the upper part of the lower end of the conveying auger main body part and is connected and aligned with a discharging hole in the lower end of the temporary coal storage hopper for manual impurity removal; a discharge port is formed in the lower part of the upper end of the conveying auger main body part and is arranged right above the conveying belt; and the control system is used for receiving a detection signal of the metal detector and carrying out delayed start control on the lateral coal output mechanism according to the distance between the metal detector and the lateral coal output mechanism and the running speed of the belt conveyor. The system achieves a good metal removal effect.

Description

Technical Field

[0001] This utility model belongs to the field of coal conveying machinery and equipment, specifically relating to a metal removal system for coal conveying belt conveyors. Background Technology

[0002] Currently, coal-fired power plants typically include metal removal devices in their coal conveying systems to remove metals during the coal conveying process. Existing metal removal devices generally use magnetic adsorption, which is effective at removing ferromagnetic metals but ineffective at removing non-magnetic metals. Since non-magnetic metals are unavoidable in coal, a large quantity of these unremovable metals can threaten the safe operation of the generator unit. Therefore, existing metal removal methods need to be improved to achieve better removal of both ferromagnetic and non-magnetic metals. Utility Model Content

[0003] This invention addresses the shortcomings of existing technologies by proposing a metal removal system for coal conveyor belts that can achieve better metal removal results.

[0004] One of the above-mentioned objectives of this utility model is achieved through the following technical solution:

[0005] A metal removal system for a coal conveyor belt includes a disc-type electromagnetic separator, a metal detector, a lateral coal output mechanism, a temporary coal storage hopper for manual waste removal, an auger-type coal return mechanism, and a control system; along the coal flow direction of the coal conveyor belt, the disc-type electromagnetic separator, the metal detector, and the lateral coal output mechanism are arranged sequentially above the conveyor belt.

[0006] The temporary coal storage hopper for manual waste removal is located outside one side of the support frame of the coal conveyor belt and directly below the coal outlet of the lateral coal output mechanism; a coal locking baffle is provided at the lower discharge port of the temporary coal storage hopper for manual waste removal.

[0007] The auger-type coal return mechanism is arranged at a downward angle from front to back and consists of a drive device, a coupling, and a conveying auger body. A feed inlet is provided at the upper part of the lower end of the conveying auger body, which is connected and aligned with the discharge outlet at the lower end of the temporary coal storage hopper for manual waste removal. A discharge outlet is provided at the lower part of the upper end of the conveying auger body, which is located directly above the conveyor belt and in front of the metal detector.

[0008] The control system is used to receive the detection signal from the metal detector and, based on the distance between the metal detector and the lateral coal output mechanism along the coal flow direction and the running speed of the belt conveyor, perform delayed start control on the lateral coal output mechanism.

[0009] Furthermore, the lateral coal output mechanism includes a rotating arm, a rotating arm support, a rotating arm drive motor, and a hopper. The rotating arm support consists of an upper support portion located above the conveyor belt and a side support portion located on one side of the support frame of the coal conveyor belt. The upper end of the rotating arm is mounted on the upper support portion via a support shaft, the direction of which is parallel to the coal flow direction. The lower end of the rotating arm support has an arc surface and extends to a position close to the upper surface of the conveyor belt. During the rotation of the rotating arm around the support shaft, a clearance fit is formed between the lower end of the rotating arm and the upper arc surface of the conveyor belt. The rotating arm drive motor is fixedly mounted on the rotating arm support, and its output end is driven by one end of the support shaft via a reducer. The hopper is installed on one side of the support frame of the coal conveyor belt and is positioned opposite the rotating arm in a direction perpendicular to the coal flow direction. Its upper end is a coal receiving port, and its lower end is a coal outlet.

[0010] The advantages and positive effects of this utility model are as follows:

[0011] This invention employs a disc-type electromagnetic separator to adsorb and remove ferromagnetic metals from coal streams. For non-magnetic metals, during the downstream transport of the coal stream, a metal detector is first used for detection. Then, through an extended control method, the coal containing non-magnetic metals is pushed to a temporary coal storage hopper for manual removal via a lateral coal output mechanism. In this hopper, the non-magnetic metals are removed manually. Finally, the coal after removal is returned to the belt conveyor via an auger-type coal return mechanism, achieving a good metal removal effect without wasting coal. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0013] Figure 2a This is a front view of the lateral coal output mechanism in this utility model;

[0014] Figure 2b This is a side view of the lateral coal output mechanism in this utility model;

[0015] Figure 2c This is a top view of the lateral coal output mechanism in this utility model;

[0016] Figure 3 This utility model relates to a screw conveyor coal return mechanism;

[0017] Figure 4 This is a schematic diagram of the structure of the electromagnet-type iron separator in this utility model. Detailed Implementation

[0018] The structure of this utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that these embodiments are descriptive and not limiting.

[0019] For a metal removal system used on a coal conveyor belt, please refer to [link / reference]. Figures 1-4 The system mainly includes a disc-type electromagnetic separator, a metal detector, a lateral coal output mechanism, a temporary coal storage hopper for manual waste removal, a screw conveyor coal return mechanism, and a control system. The disc-type electromagnetic separator and metal detector are suspended above the conveyor belt and utilize existing equipment.

[0020] Along the coal flow direction of the coal conveyor belt, the disc electromagnetic separator, metal detector, and lateral coal output mechanism are positioned directly above the conveyor belt at a set interval.

[0021] The disc-type electromagnetic separator is used to adsorb ferromagnetic metals in coal. The metal detector is used to detect whether the coal after being separated by the disc-type electromagnetic separator contains other non-magnetic metals. The detected signal is transmitted to the control system. In the presence of non-magnetic metals, the control system calculates the time t required for the metal detector to move from its position to the side output coal mechanism based on the ratio of the distance between the metal detector and the side output coal mechanism to the coal flow conveying speed. After the metal detector detects the non-metal signal, the side output coal mechanism is activated after a delay of time t, so that the coal containing non-magnetic metals is output from one side of the conveyor belt, ensuring that the coal flow being conveyed backwards does not contain metals.

[0022] In this invention, the coal conveyor belt 1 is concave and arc-shaped, supported by idler rollers 2 located below the conveyor belt. To achieve lateral output of coal containing non-magnetic metals, the lateral coal output mechanism includes a rotating arm 3, a rotating arm support, a rotating arm drive motor 6, and a hopper 5. The rotating arm support consists of an upper support portion located above the conveyor belt and a side support portion located on one side of the support frame of the coal conveyor belt. The upper end of the rotating arm is mounted on the upper support portion via a support shaft 4, the direction of which is parallel to the coal flow direction. The lower end of the rotating arm support has an arc surface and extends to a position close to the upper surface of the conveyor belt. During the rotation of the rotating arm around the support shaft, a clearance fit is formed between the lower end of the rotating arm and the upper arc surface of the conveyor belt. The rotating arm drive motor is fixedly mounted on the rotating arm support, and its output end is connected to one end of the support shaft via a reducer to drive the rotating arm to rotate. The feeding hopper is installed on one side of the support frame of the coal conveyor belt and is positioned opposite the rotating arm perpendicular to the coal flow direction. Its upper end is the coal receiving port and its lower end is the coal discharge port. The coal receiving port is used to receive the coal pushed out by the rotating arm.

[0023] The temporary coal storage hopper for manual waste removal is located outside one side of the support frame of the coal conveyor belt, directly below the coal outlet of the feed hopper. A coal-locking baffle is installed at the lower outlet of the temporary coal storage hopper. Coal falling from the feed hopper's outlet enters the temporary coal storage hopper, where non-magnetic metals are removed manually. A handheld metal detector can be used to check whether all non-magnetic metals have been removed from the temporary coal storage hopper.

[0024] The auger-type coal return mechanism is used to return non-magnetic metal coal that has been picked out of the temporary coal storage hopper for manual waste removal to the conveyor belt. The auger-type coal return mechanism is inclined downwards from front to back and mainly consists of a drive unit 7, a coupling 8, and a conveyor auger body 9. A feed inlet 9.1 is provided at the upper lower part of the conveyor auger body, which is aligned with the discharge outlet at the lower end of the temporary coal storage hopper. When the coal-locking baffle at the lower end of the temporary coal storage hopper is opened, the coal in the temporary coal storage hopper enters the conveyor auger through the feed inlet of the conveyor auger body, and is pushed upwards as the auger operates. A discharge outlet 9.2 is provided at the lower upper part of the conveyor auger body, located directly above the conveyor belt, to return the coal to the conveyor belt.

[0025] The working principle of this metal removal system is as follows:

[0026] See Figure 1 The coal conveyor belt is used to transport coal. During operation, the control system activates a disc-type electromagnetic separator to attract metal objects in the coal that can be attracted by electromagnetic force, achieving initial screening. If a small amount of metal that cannot be attracted by electromagnetic force remains in the coal, this metal component will travel along the coal flow direction to a position below the metal detector, triggering the detector. The metal detector will then send a signal to the control system indicating that metal has passed through. As the metal object continues along the coal flow direction to the lateral coal output mechanism, the control system activates the lateral coal output mechanism. This mechanism rotates the arm towards the hopper side, quickly removing the metal component and surrounding coal into a temporary manual waste storage hopper on the side of the conveyor belt. The rotating arm stops when it reaches a position away from the hopper, a position that does not affect the normal transport of coal. The coal that falls into the temporary coal storage hopper for manual waste removal is manually picked up to remove non-magnetic metal components. Then, the coal locking baffle of the storage hopper is opened, and the coal in the temporary coal storage hopper is transported to the conveyor belt by an auger-type coal return mechanism. The entire process achieves complete removal of metal components from the coal.

[0027] Although embodiments and drawings of the present invention have been disclosed for illustrative purposes, those skilled in the art will understand that various substitutions, variations and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A metal removal system for a coal conveyor belt, characterized in that: It includes a disc-type electromagnetic separator, a metal detector, a lateral coal output mechanism, a temporary coal storage hopper for manual waste removal, an auger-type coal return mechanism, and a control system; along the coal flow direction of the coal conveyor belt, the disc-type electromagnetic separator, the metal detector, and the lateral coal output mechanism are arranged sequentially above the conveyor belt. The temporary coal storage hopper for manual waste removal is located outside one side of the support frame of the coal conveyor belt and directly below the coal outlet of the lateral coal output mechanism; a coal locking baffle is provided at the lower discharge port of the temporary coal storage hopper for manual waste removal. The auger-type coal return mechanism is arranged at a downward angle from front to back and consists of a drive device, a coupling, and a conveying auger body. A feed inlet is provided at the upper part of the lower end of the conveying auger body, which is connected and aligned with the discharge outlet at the lower end of the temporary coal storage hopper for manual waste removal. A discharge outlet is provided at the lower part of the upper end of the conveying auger body, which is located directly above the conveyor belt and in front of the metal detector. The control system is used to receive the detection signal from the metal detector and, based on the distance between the metal detector and the lateral coal output mechanism along the coal flow direction and the running speed of the belt conveyor, perform delayed start control on the lateral coal output mechanism.

2. The metal removal system for a coal conveyor belt according to claim 1, characterized in that: The lateral coal output mechanism includes a rotating arm, a rotating arm support, a rotating arm drive motor, and a hopper. The rotating arm support consists of an upper support portion located above the conveyor belt and a side support portion located on one side of the support frame of the coal conveyor belt. The upper end of the rotating arm is mounted on the upper support portion via a support shaft, the direction of which is parallel to the coal flow direction. The lower end of the rotating arm support has an arc surface and extends to a position close to the upper surface of the conveyor belt. During the rotation of the rotating arm around the support shaft, a clearance fit is formed between the lower end of the rotating arm and the upper arc surface of the conveyor belt. The rotating arm drive motor is fixedly mounted on the rotating arm support, and its output end is driven by one end of the support shaft via a reducer. The hopper is installed on one side of the support frame of the coal conveyor belt and is positioned opposite the rotating arm perpendicular to the coal flow direction. Its upper end is a coal inlet, and its lower end is a coal outlet.

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