Belt conveyor head belt coal recovery device

Abstract

This invention discloses a coal recovery device for the head of a belt conveyor, belonging to the field of material conveying technology. It includes a first and second sweeper installed below the return belt, a receiving hopper, a cover, a conveying mechanism, a vibrator, and a control unit. The receiving hopper is located below the two sweepers, with the feed end of the conveying mechanism connected to the discharge port of the receiving hopper, and the discharge end connected to the head coal collection pipe. The cover is installed outside the receiving hopper and the conveying mechanism. The vibrator is installed on the receiving hopper or the cover. The control unit is electrically connected to the vibrator, the second sweeper, and the conveying mechanism, enabling synchronous start-up when the main conveyor starts and delayed stop-up when it stops. This invention uses two-stage sweepers to collaboratively scrape away material adhering to the return belt, the receiving hopper works with the vibrator to prevent blockage, the cover and anti-escape components suppress dust emission, and the control unit achieves intelligent linkage, fault alarm, and data recording, effectively improving on-site environmental protection and equipment reliability.

Description

Technical Field

[0001] This invention relates to the field of material conveying technology, specifically to a coal recovery device at the head of a belt conveyor. Background Technology

[0002] Belt conveyors are commonly used for transporting bulk materials. When conveying coal with high moisture content, fine coal particles and coal slurry easily adhere to the surface of the return belt, forming coal deposits in the head area. These deposits have high moisture content and poor flowability, and long-term accumulation can lead to belt misalignment, idler jamming, and other problems, affecting the safe operation of the equipment. Currently, the industry typically installs a scraper under the return belt to remove these adhering materials. However, the coal slurry scraped off by the scraper needs to be further collected and transported to the head coal drop pipe.

[0003] For the treatment of scraped coal slime, some existing technologies have collection and transfer solutions. For example, a receiving hopper is added below the cleaner, or a transfer mechanism such as a screw conveyor or scraper conveyor is configured. A few solutions also link the start and stop of the transfer mechanism with the belt conveyor. However, in the above-mentioned existing solutions, the receiving hopper and transfer mechanism are mostly open, and coal dust can easily overflow from the gaps, causing serious dust pollution. The control method is simple, only able to realize basic start and stop, and lacks real-time detection and fault alarm functions for parameters such as blockage and operating status. It still requires real-time manual monitoring and cannot achieve unattended operation. Therefore, there is an urgent need in this field for a coal recovery device at the head of a belt conveyor. Summary of the Invention

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a coal recovery device for the head of a belt conveyor, which has advantages such as automatic cleaning, reduced dust emission, anti-clogging vibration, and intelligent linkage control. It solves the problems of coal powder overflow, easy clogging, and the need for real-time manual monitoring in existing recovery devices.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: This invention provides a coal recovery device for the head of a belt conveyor, including a first cleaner and a second cleaner installed below the return belt, characterized in that: it also includes a receiving hopper, a cover, a conveying mechanism, a vibrator, and a control unit; The receiving hopper is located below the two sweepers; The inlet end of the conveying mechanism is connected to the outlet of the receiving hopper, and the outlet end is connected to the head coal drop pipe. The cover is installed outside the receiving hopper and the conveying mechanism, and together with the shell of the receiving hopper and the conveying mechanism, it encloses them. The vibrator is installed on the receiving bucket or cover; The control unit is electrically connected to the vibrator, belt conveyor, second cleaner, and conveying mechanism to achieve synchronous start of each cleaner and conveying mechanism when the belt conveyor starts, and delayed stop of each cleaner and conveying mechanism when the belt conveyor stops.

[0006] The receiving bucket is symmetrically provided with suspension lugs on both sides above it, and the suspension lugs are fixedly connected to the side of the belt conveyor frame through elastic shock-absorbing hangers.

[0007] The first sweeper is an interlaced alloy sweeper, and the second sweeper is an electric brush sweeper.

[0008] The conveying mechanism is a chain-plate scraper conveyor, which includes a housing, a conveying chain, and scraper plates fixed at intervals on the conveying chain. It also includes an active transmission wheel and a passive transmission wheel that are rotatably connected to both ends of the housing, and a drive motor that is fixedly connected to the axis of the active transmission wheel; The drive motor is connected to the control unit, and the conveyor chain is sleeved on the active drive wheel and the passive drive wheel.

[0009] The cover includes a protective shell and a detachable manhole door; the detachable manhole door includes a panel and a locking bolt that cooperates with the protective shell, the locking bolt is used to fix the panel, and the panel has a transparent window.

[0010] The vibrator is either a pneumatic vibrator or an electromagnetic vibrator, and its control terminal is connected to the control unit, and it operates intermittently at set time intervals.

[0011] The control unit includes a PLC controller, and a current detection module and / or a start / stop signal acquisition module respectively connected to the PLC controller; The current detection module is used to collect the current signal of the belt conveyor drive motor, and the start / stop signal acquisition module is used to collect the passive dry contact signal of the belt conveyor control circuit. The control unit also includes a contactor or frequency converter electrically connected to the motor of the second sweeper and the drive motor of the conveying mechanism.

[0012] The control unit is also connected to a fault alarm module and a data recording module, which are used to issue alarm signals and record equipment operating parameters when the cleaner or conveyor mechanism malfunctions.

[0013] The feed inlet of the receiving hopper is wider than the combined width of the first and second sweepers, and an anti-escape component is provided at the feed inlet of the receiving hopper.

[0014] The anti-escape component includes a frame installed inside the receiving hopper and several rotating shafts. The rotating shafts are arranged in parallel and equidistant and are rotatably connected to the frame. Several strip-shaped flexible dustproof curtains are glued to each rotating shaft.

[0015] (III) Beneficial Effects Compared with the prior art, the present invention provides a coal recovery device for the head of a belt conveyor, which has the following beneficial effects: The head coal recovery device of this belt conveyor effectively removes large coal particles and fine coal slurry adhering to the surface of the return belt through a two-stage coordinated scraping process using a first-stage interlaced alloy cleaner and a second-stage electric brush cleaner. The receiving hopper is suspended from the side of the frame by an elastic shock-absorbing rod, which, together with the intermittent impact of the vibrator, prevents high-moisture coal slurry from clogging the discharge port. The cover and the conveying mechanism are connected only by an elastic sealing strip without a rigid connection, which ensures both sealing and vibration isolation, and ensures long-term stable operation of the equipment.

[0016] The coal recovery device at the head of the belt conveyor is linked with the main conveyor through a control unit: it starts cleaning and conveying after a delay to avoid drying and clogging; the feed inlet of the receiving hopper is equipped with an anti-escape component consisting of a rotating shaft and a flexible dustproof curtain to effectively suppress coal dust from escaping; at the same time, it is equipped with a fault alarm and data recording module to facilitate remote monitoring and maintenance, significantly improving the on-site environmental protection level and equipment reliability. Attached Figure Description

[0017] Figure 1 This is a side view of the overall structure of the present invention; Figure 2 This is a three-dimensional structural diagram of the anti-escape component of the present invention; Figure 3 This is a block diagram showing the connection relationship of the control unit of the present invention; Figure 4 This is a schematic diagram of the control unit structure of the present invention.

[0018] In the diagram: 1. First sweeper; 2. Second sweeper; 3. Receiving hopper; 4. Cover; 5. Conveying mechanism; 6. Vibrator; 7. Head coal drop pipe; 8. Control unit; 9. Fault alarm module; 10. Data recording module; 11. Anti-escape component; 301. Suspension lug; 302. Elastic shock-absorbing rod; 401. Protective shell; 402. Removable manhole door; 4021. Panel; 4022. Locking bolt; 4023. Transparent window; 501. Shell; 502. Conveyor chain; 503. Scraper; 504. Drive wheel; 505. Driven wheel; 506. Drive motor; 801. PLC controller; 802. Current detection module; 803. Start / stop signal acquisition module; 1101. Frame; 1102. Rotating shaft; 1103. Flexible dustproof curtain. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] Please see Figure 1-4 A coal recovery device for the head of a belt conveyor includes a first cleaner 1 and a second cleaner 2 installed below the return belt, wherein both the first cleaner 1 and the second cleaner 2 are installed on the side of the belt conveyor frame. It also includes a receiving hopper 3, a cover 4, a conveying mechanism 5, a vibrator 6, and a control unit 8. The receiving hopper 3 is located below the two cleaners, and its upper end completely covers the working area of ​​the first cleaner 1 and the second cleaner 2. The feed end of the conveying mechanism 5 is connected to the discharge port of the receiving hopper 3, and its discharge end is connected to the head coal collection pipe 7. The cover 4 is installed outside the receiving hopper 3 and the conveying mechanism 5, and together with the housing 501 of the receiving hopper 3 and the conveying mechanism 5, it encloses them. The cover 4 is made of 2 to 3 mm thick cold-rolled steel plate or stainless steel plate, and its shape is customized according to the shape of the receiving hopper 3 and the conveying mechanism 5. The upper end of the cover 4 is fixedly connected to the receiving hopper 3 by bolts, and is used to cover the discharge port of the receiving hopper 3. The lower end covers the conveying mechanism 5. An elastic sealing strip is provided between the contact surface of the cover 4 and the side of the conveying mechanism 5. The use of an elastic sealing strip can achieve a slight elastic connection while ensuring a certain degree of sealing, reducing vibration with the conveying mechanism 5. The elastic sealing strip can be a EPDM (ethylene propylene diene monomer) foam sealing strip.

[0023] The control unit 8 is electrically connected to the drive motor 506 of the vibrator 6, the belt conveyor, the second sweeper 2, and the conveying mechanism 5, so as to realize the synchronous start of each sweeper and the conveying mechanism 5 when the belt conveyor starts, and the delay in stopping each sweeper and the conveying mechanism 5 when the belt conveyor stops.

[0024] When belt conveyors transport coal with high moisture content, a layer of fine coal particles and coal sludge adheres to the surface of the return belt. During conveyor operation, some of these deposits naturally detach, while the rest require forced scraping by cleaners. This device uses a first cleaner 1 and a second cleaner 2 installed below the return belt, with a receiving hopper 3 located directly below the two cleaners to collect the coal ash, reducing the spread of the cleaned coal ash. Simultaneously, the inlet of the receiving hopper 3 maintains a gap of 10mm to 30mm between itself and the lower surface of the return belt, ensuring that the normal operation of the belt is not affected while guaranteeing that all scraped coal sludge falls into the receiving hopper 3 and that it has a certain degree of sealing.

[0025] In this embodiment, suspension lugs 301 are symmetrically arranged on the upper sides of the receiving bucket 3. The suspension lugs 301 are fixedly connected to the side of the belt conveyor frame through elastic shock-absorbing rods 302. The rubber shock-absorbing sleeves and compression springs in the elastic shock-absorbing rods 302 can simultaneously play the roles of positioning, vibration reduction and noise reduction, ensuring that the receiving bucket 3 remains stably aligned under vibration conditions and avoiding scratching with the return belt due to shaking.

[0026] In this embodiment, the first cleaner 1 is an interlaced alloy cleaner, and the second cleaner 2 is an electric brush cleaner. The first cleaner 1 uses interlaced alloy blades made of tungsten carbide hard alloy, which is highly hard and wear-resistant. This cleaner is installed on the straight section of the return belt below the head roller. A spring clamping device keeps the alloy blades in close contact with the belt surface to scrape off large, firmly adhered coal particles and coarse coal slime. The second cleaner 2 is an electric brush cleaner, located behind the first cleaner 1 (along the belt running direction). After the first cleaner 1 has scraped, a thin layer of fine coal dust and water-containing coal slime will remain on the belt surface. The electric brush cleaner sweeps this off using a high-speed rotating brush roller. The brush roller of the electric brush cleaner is made of nylon filaments or a mixture of steel wire and nylon. The filament diameter is 0.3mm to 0.8mm, and the filament density is adjusted according to the actual working conditions.

[0027] The receiving hopper 3 is welded from wear-resistant steel plates (such as NM400 or Q345B with a wear-resistant lining) with a thickness of 6 to 10 mm. The receiving hopper 3 is a square funnel shape, wider at the top and narrower at the bottom. The width of the upper feed inlet is greater than the combined width of the first and second sweepers 1 and 2. Specifically, the feed inlet width is 100 to 200 mm wider than the combined width of the two sweepers to ensure that the coal sludge scraped off by the sweepers does not spill onto the outside of the receiving hopper 3. The depth (vertical direction) of the receiving hopper 3 is typically 300 to 500 mm to accommodate a certain amount of instantaneous coal accumulation. The inner wall of the receiving hopper 3 is mirror-polished to reduce the adhesion of high-moisture coal sludge. The side plates of the receiving hopper 3 are parallel to the direction of the return conveyor belt to ensure that the coal sludge falls into the hopper.

[0028] In this embodiment, the conveying mechanism 5 is a chain-plate scraper conveyor, including a housing 501, a conveying chain 502, and scraper plates 503 fixed at intervals on the conveying chain 502; it also includes a drive drive wheel 504 and a driven drive wheel 505 rotatably connected to both ends of the housing 501, and a drive motor 506 fixedly connected to the axis of the drive drive wheel 504; the drive motor 506 is connected to the control unit 8, and the conveying chain 502 is sleeved on the drive drive wheel 504 and the driven drive wheel 505. The feed end of the chain-plate scraper conveyor is located directly below the receiving hopper 3, and the discharge end is located above the inlet of the head coal drop pipe 7. The housing 501 of the conveying mechanism 5 is made of wear-resistant steel plate. The conveying chain 502 is a double-row roller chain, and the scraper plates 503 are high wear-resistant cast steel parts with a thickness of 10 to 15 mm and a width matching the inner width of the housing 501 of the conveying mechanism 5. The scraper 503 is fixed to the conveyor chain 502 by bolts or welding, and the distance between adjacent scraper 503 is 300 to 500 mm. When the chain drives the scraper 503 to move, the scraper 503 pushes the coal slurry falling from the receiving bucket 3 along the bottom plane of the shell 501 until it falls into the head coal drop pipe 7.

[0029] In this embodiment, the cover 4 includes a protective shell 401 and a detachable manhole door 402. The detachable manhole door 402 includes a panel 4021 and a locking bolt 4022 that cooperates with the protective shell 401. The locking bolt 4022 is used to fix the panel 4021. The detachable manhole door 402 is located on the side of the cover 4. The panel 4021 is circular, and the locking bolt 4022 is a quick-opening bolt. The panel 4021 is equipped with a transparent observation window 4023 (plexiglass) to facilitate inspection personnel to observe the internal coal sludge accumulation.

[0030] In this embodiment, the vibrator 6 is a pneumatic vibrator or an electromagnetic vibrator, whose control terminal is connected to the control unit 8, and operates intermittently at set time intervals. The function of the vibrator 6 is to prevent high-moisture coal slime from bridging or clogging at the discharge port of the receiving hopper 3. The vibrator 6 is usually installed on the conical side wall of the receiving hopper 3 or at the corresponding position of the cover 4. The pneumatic vibrator is powered by compressed air, has a large impact force, and is suitable for situations where the coal slime viscosity is particularly high; the electromagnetic vibrator is driven by an electromagnet, has an adjustable impact force, and low energy consumption. The working interval and time of the vibrator 6 can be set according to the moisture content of the coal slime, for example, vibrating for 10 seconds every 5 minutes of operation.

[0031] In this embodiment, the control unit 8 includes a PLC controller 801, and a current detection module 802 and / or a start / stop signal acquisition module 803 respectively connected to the PLC controller 801; the current detection module 802 is used to acquire the current signal of the belt conveyor drive motor, and the start / stop signal acquisition module 803 is used to acquire the passive dry contact signal of the belt conveyor control circuit; the control unit 8 also includes a contactor or frequency converter electrically connected to the motor of the second cleaner 2 and the drive motor 506 of the conveying mechanism 5; the first cleaner 1 is an interlaced alloy cleaner without a drive motor and does not need to be electrically connected to the control unit 8.

[0032] The PLC controller 801 uses a Siemens S7-1200 or Mitsubishi FX series general-purpose programmable controller. The current detection module 802 collects the current of the belt conveyor drive motor through a current transformer. When the current exceeds a set threshold (e.g., 20% of the rated current), it determines that the conveyor is in operation. The start / stop signal acquisition module 803 directly obtains the passive dry contact signal from the conveyor control circuit. When both modules are configured simultaneously, they serve as backups for each other: the PLC controller 801 defaults to using the start / stop signal as the primary judgment criterion, automatically switching to the current detection module 802 signal when this signal fails; if only one module is configured, its signal is used exclusively. The motor of the second cleaner 2 and the drive motor 506 of the conveyor mechanism 5 are connected to the PLC controller 801 via frequency converters.

[0033] The operating logic is as follows: Upon detecting a belt conveyor start signal, a 2-second delay is established (to avoid the starting inrush current), then the second cleaner 2 and conveying mechanism 5 are activated to begin operation. Upon detecting a belt conveyor stop signal, the PLC starts a delay timer (the delay time is adjustable, typically 60 to 120 seconds). During this time, the cleaner and conveying mechanism 5 continue to operate, completely conveying all residual coal sludge from the belt and coal sludge that has fallen into the receiving hopper 3, before automatically stopping. This delayed shutdown function prevents coal sludge from accumulating and drying inside the equipment.

[0034] In this embodiment, the control unit 8 is also connected to a fault alarm module 9 and a data recording module 10, used to issue alarm signals and record equipment operating parameters when the sweeper or conveyor mechanism 5 malfunctions. The fault alarm module 9 includes an audible and visual alarm (installed on-site) and a remote alarm signal (which can be transmitted to the central control room). When faults such as motor overload of the second sweeper 2, overload of the drive motor 506 of the conveyor mechanism 5, chain breakage, or malfunction of the vibrator 6 occur, the PLC detects the fault signal, immediately stops the corresponding equipment, and issues an alarm. The data recording module 10 is built into the PLC and can record parameters such as cumulative running time, number of starts and stops, fault type, and occurrence time, facilitating maintenance personnel to analyze the equipment status.

[0035] In this embodiment, the width of the feed inlet of the receiving hopper 3 is greater than the combined width of the first cleaner 1 and the second cleaner 2, and an anti-escape component 11 is provided at the feed inlet of the receiving hopper 3. The design that the feed inlet width is greater than the combined width of the two cleaners ensures that any splashed or slipped coal slurry can fall into the receiving hopper 3. The anti-escape component 11 is used to reduce the escape of coal dust from the receiving hopper 3 due to the disturbance of airflow caused by the operation of the electric brush cleaner.

[0036] In this embodiment, the anti-escape component 11 includes a frame 1101 installed inside the receiving hopper 3 and several rotating shafts 1102. The rotating shafts 1102 are arranged parallel and equidistantly and are rotatably connected to the frame 1101. Several strip-shaped flexible dustproof curtains 1103 are glued to each rotating shaft 1102. The flexible dustproof curtains 1103 are 2 to 3 mm thick and extend downwards to approximately 50 to 100 mm below the feed inlet. Multiple dustproof curtains on the same rotating shaft 1102 are arranged equidistantly. This effectively prevents the spread of fine coal powder from the receiving hopper 3 without affecting the entry of coal chunks or coal dust. The frame 1101 is installed in the receiving hopper 3 using a stepped snap-fit ​​structure for easy disassembly. Simultaneously, the upper surface of the frame 1101 has an inclined surface to facilitate the entry of coal powder or coal chunks into the receiving hopper 3.

[0037] In summary: the coal recovery device at the head of the belt conveyor effectively removes large coal particles and fine coal slurry adhering to the surface of the return belt through a two-stage coordinated scraping process using a first-stage interlaced alloy cleaner 1 and a second-stage electric brush cleaner 2; the receiving hopper 3 is suspended from the side of the frame by an elastic shock-absorbing rod 302, which, in conjunction with the intermittent impact of the vibrator 6, prevents high-moisture coal slurry from clogging the discharge port; the hood 4 and the conveying mechanism 5 are connected only by an elastic sealing strip without a rigid connection, which ensures both sealing and vibration isolation, thus ensuring long-term stable operation of the equipment.

[0038] The coal recovery device at the head of the belt conveyor is linked with the main conveyor through the control unit 8: it starts cleaning and conveying after a delay to avoid dry caking and blockage; the feed inlet of the receiving hopper 3 is equipped with an anti-escape component 11 consisting of a rotating shaft 1102 and a flexible dustproof curtain 1103 to effectively suppress coal dust from escaping; at the same time, it is equipped with a fault alarm module 9 and a data recording module 10 to facilitate remote monitoring and maintenance, significantly improving the on-site environmental protection level and equipment reliability.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A coal recovery device at the head of a belt conveyor, comprising a first cleaner and a second cleaner installed below the return belt, characterized in that: It also includes a receiving hopper, a cover, a conveying mechanism, a vibrator, and a control unit; The receiving hopper is located below the two sweepers; The inlet end of the conveying mechanism is connected to the outlet of the receiving hopper, and the outlet end is connected to the head coal drop pipe. The cover is installed outside the receiving hopper and the conveying mechanism, and together with the shell of the receiving hopper and the conveying mechanism, it encloses them. The vibrator is installed on the receiving bucket or cover; The control unit is electrically connected to the vibrator, belt conveyor, second cleaner, and conveying mechanism to achieve synchronous start of each cleaner and conveying mechanism when the belt conveyor starts, and delayed stop of each cleaner and conveying mechanism when the belt conveyor stops.

2. The belt conveyor head coal recovery device according to claim 1, characterized in that: The receiving bucket is symmetrically provided with suspension lugs on both sides above it, and the suspension lugs are fixedly connected to the side of the belt conveyor frame through elastic shock-absorbing hangers.

3. The belt conveyor head coal recovery device according to claim 1, characterized in that: The first sweeper is an interlaced alloy sweeper, and the second sweeper is an electric brush sweeper.

4. The belt conveyor head coal recovery device according to claim 1, characterized in that: The conveying mechanism is a chain-plate scraper conveyor, including a housing, a conveying chain, and scraper plates fixed at intervals on the conveying chain; It also includes an active transmission wheel and a passive transmission wheel that are rotatably connected to both ends of the housing, and a drive motor that is fixedly connected to the axis of the active transmission wheel; The drive motor is connected to the control unit, and the conveyor chain is sleeved on the active drive wheel and the passive drive wheel.

5. A belt conveyor head coal recovery device according to claim 1, characterized in that: The enclosure includes a protective shell and a detachable manhole door; the detachable manhole door includes a panel and locking bolts that cooperate with the protective shell, the locking bolts are used to fix the panel, and the panel has a transparent window.

6. The belt conveyor head coal recovery device according to claim 1, characterized in that: The vibrator is a pneumatic vibrator or an electromagnetic vibrator, and its control terminal is connected to the control unit, and it works intermittently at set time intervals.

7. A coal recovery device at the head of a belt conveyor according to claim 4, characterized in that: The control unit includes a PLC controller, and a current detection module and / or a start / stop signal acquisition module respectively connected to the PLC controller; The current detection module is used to collect the current signal of the belt conveyor drive motor, and the start / stop signal acquisition module is used to collect the passive dry contact signal of the belt conveyor control circuit. The control unit also includes a contactor or frequency converter electrically connected to the motor of the second sweeper and the drive motor of the conveying mechanism.

8. A belt conveyor head coal recovery device according to claim 1, characterized in that: The control unit is also connected to a fault alarm module and a data recording module, which are used to issue alarm signals and record equipment operating parameters when the cleaner or conveyor mechanism malfunctions.

9. A coal recovery device for the head of a belt conveyor according to claim 1, characterized in that: The feed inlet width of the receiving hopper is greater than the total width of the first and second sweepers, and an anti-escape component is provided at the feed inlet of the receiving hopper.

10. A coal recovery device at the head of a belt conveyor according to claim 9, characterized in that: The anti-escape component includes a frame installed inside the receiving hopper and several rotating shafts. The rotating shafts are arranged in parallel and equidistant and are rotatably connected to the frame. Several strip-shaped flexible dustproof curtains are glued to each rotating shaft.

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