A belt coal feeding device capable of detecting and screening anchor rods and long materials

Abstract

The present invention discloses a belt coal feeding device capable of detecting and screening anchor rods and long materials, including a coal conveying belt arranged below a coal feeder, wherein the coal feeder horizontally feeds coal into a discharge bin through a conveyor belt, and the discharge bin conveys coal to the coal conveying belt, wherein a rotating flap fixed by an axle rod is provided at an opening on the side wall of the discharge bin vertically downward opposite to the coal feeder conveyor belt in the discharge bin, the bottom opening of the rotating flap is lower than the horizontal plane of the coal feeder conveyor belt, an outer protective frame plate is provided at a certain distance outside the rotating flap, and the discharge channel opening of the discharge bin is arranged when the rotating flap is inclined to the vertical state. The present invention can effectively detect and screen out anchor rods and long material ironware that are extremely harmful to the belt system through the flap mechanism provided, and effectively avoid the problem of longitudinal tearing of the belt system caused by anchor rods and long material ironware.

Description

Technical Field

[0001] The present invention relates to a belt coal feeding device capable of detecting and screening anchor rods and long materials, which can effectively detect and screen out anchor rods and long materials that are extremely harmful to the belt system, and effectively avoid the hidden danger of longitudinal tearing of the belt system caused by anchor rods and long materials. Background Art

[0002] In coal mine production, the belt system has always been the main mode of transportation in coal mine transportation. According to Australian statistics, there is a 20% probability that a belt will be torn longitudinally once in its life cycle. Once a conveyor belt worth millions or even more is torn longitudinally, it will cause huge losses or even be completely destroyed in a very short time. Even if it can be repaired, it will require considerable manpower, material resources and time, which will have a great impact on normal production safety. According to statistics from China Coal Group Corporation, there have been 38 longitudinal belt tearing accidents from 2013 to 2017, with a downtime of 950.6 hours, a torn belt surface of 7,170.6 meters, and direct economic losses of 11.72 million yuan.

[0003] The reasons for the longitudinal tearing of the belt are: A. During the operation of the belt, the belt has a large one-way deviation, forming wrinkles or folds on one side, which is subjected to uneven tension or pinching and scratching, causing the belt to tear. B. At the material loading point of the belt conveyor, sharp objects or long rods are mixed in the material to scratch and tear the belt. There are two types of scratches: one is a pressure scratch caused by a sharp object; the other is a penetrating scratch caused by a sharp object. For the first type of fault, the comprehensive protection of the belt is now relatively complete. As long as the deviation switch array is increased and the deviation is reliable, the fault caused by deviation will be eliminated. The second type of fault is more difficult to handle. At present, two measures are basically taken in China: 1) Install an iron remover at the loading point; 2) Install an iron remover in the middle of the belt. The use of an iron remover cannot guarantee 100% absorption and recovery of iron, and it is powerless to press it into the lower layer of the material or long non-iron.

[0004] A-belt coal feeder has large feeding capacity, small size and light weight, and is widely used in major transfer points in coal flow transportation system in coal mines. However, there has been a lack of information on the inspection and screening of anchor rods and long materials at the material outlet of A-belt coal feeder. Summary of the invention

[0005] The purpose of the present invention is to provide a belt coal feeding device that can detect and screen anchor rods and long materials. Through the flap mechanism arranged in the lower hopper, anchor rods and long ironware that are extremely harmful to the belt system can be effectively detected and screened out, effectively avoiding the hidden danger of longitudinal tearing of the belt system caused by anchor rods and long ironware.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the present invention is: a belt coal feeding device that can detect and screen anchor rods and long materials, including a coal transport belt arranged below the coal feeder, the coal feeder horizontally delivers coal into a discharge bin through a conveyor belt, and the discharge bin transports the coal to the coal transport belt, wherein a rotating flap fixed by an axis rod is provided at an opening on the side wall of the discharge bin vertically downward opposite to the coal feeder conveyor belt, the bottom opening of the rotating flap is lower than the horizontal plane of the coal feeder conveyor belt, an outer protective frame plate is provided at a distance on the outer side of the rotating flap, and the discharge channel opening of the discharge bin is inclined when the rotating flap is in the vertical state.

[0007] A further solution is that the inclination of the discharge channel opening is opposite to the running direction of the coal conveyor belt.

[0008] A further solution is that the inclination of the discharge channel opening and the horizontal angle thereof with the coal conveyor belt are 60 to 70 degrees.

[0009] The solution is further that: the spacing distance between the outer protection frame plate and the rotating flap when they are perpendicular is not less than 150 mm, and the spacing is provided with a through opening connected to the discharge channel at the bottom end, and the through opening is on the rotating flap side.

[0010] The solution is further that a cushion block is provided on the plate surface opposite to the outer protective frame plate, and when the rotating flap is reversed and opened, the cushion block ensures that the distance between the bottom surface of the rotating flap and the outer protective frame plate is not less than 8 mm.

[0011] A further solution is: an inductive magnetic steel sensor is arranged on the rotating flap, and the inductive magnetic steel sensor is used to send a fault signal when the rotating flap is pushed open by an anchor rod or a long material.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: through the flap mechanism arranged in the lower hopper, anchor rods and long ironware that are extremely harmful to the belt system can be effectively detected and screened out, effectively avoiding the problem of longitudinal tearing of the belt system caused by anchor rods and long ironware, and realizing the detection and screening of anchor rods and long materials for coal mining machines on the A belt; the structure is simple, not restricted by the installation environment, the cost of purchasing equipment and maintenance is low, the failure rate is low, and hidden dangers are eliminated for the production of mine belt conveyor systems.

[0013] The present invention is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the present invention. DETAILED DESCRIPTION

[0015] A belt coal feeding device capable of detecting and screening anchor rods and long materials, such as Figure 1As shown, the belt coal feeding device capable of detecting and screening anchor rods and long materials includes a coal conveying belt 2 arranged below a coal feeder 1, and the coal feeder is vertically arranged with a discharge bin 3 through a conveyor belt 101 of the coal feeder. The coal feeder horizontally delivers coal 4 into a discharge bin through the conveyor belt 101 of the coal feeder, and the discharge bin delivers the coal to the coal conveying belt through a discharge channel opening 301 of the discharge bin, wherein a rotating flap 6 fixed by an axle rod 5 is provided on an opening on a side wall of the discharge bin vertically downward opposite to the conveyor belt of the coal feeder in the discharge bin, and a bottom opening 601 of the rotating flap is lower than the horizontal plane of the conveyor belt of the coal feeder, and when the rotating flap is turned, the coal 4 is horizontally delivered to a discharge bin 301 through the discharge channel opening 301 of the discharge bin. An outer protective frame plate 302 is arranged at a certain distance on the outside of the movable flap. The discharge channel opening of the unloading bin is inclined when the rotating flap is in a vertical state. The inclination of the discharge channel opening is opposite to the running direction of the arrow 201 of the coal conveyor belt, and the horizontal angle with the coal conveyor belt is 60 to 70 degrees. The conveyed coal blocks will fall on the coal conveyor belt very smoothly, and will not cause shaking to the unloading bin. The horizontal distance between the rotating flap 6 and the coal feeder conveyor belt 101, and the vertical distance between the bottom opening of the rotating flap and the coal feeder conveyor belt 101 need to be determined according to the length of the anchor rods and long materials to be detected and screened.

[0016] In the embodiment: In order to safely detect anchor rods and long materials, the spacing distance between the outer protection frame plate and the rotating flap when they are perpendicular is not less than 150 mm, so that the detected anchor rods and long materials are stuck, and to ensure that the coal blocks flowing into the interval enter the discharge channel, the interval is provided with a through opening 303 at the bottom end which is connected to the discharge channel, and the through opening is on the rotating flap side.

[0017] Wherein: a cushion block 602 is arranged on the plate surface opposite to the outer protection frame plate of the rotating flap, and when the rotating flap is reversed and opened, the cushion block ensures that the distance between the bottom surface of the rotating flap and the outer protection frame plate is not less than 8mm.

[0018] In order to remove the detected anchor rods and long materials in time, an inductive magnetic steel sensor or a touch sensing switch is arranged on the rotating flap, and the inductive magnetic steel sensor or the touch sensing switch is used to send a fault signal when the rotating flap is pushed open by the anchor rod or the long material.

[0019] Here is a specific example:

[0020] The width of the coal feeder belt is 1100mm, and the cross-sectional area of ​​the feeding bin is 1550X1300mm. According to the size of the coal drop point and the width and height of the coal flow, we cut the outer guard plate of the coal feeder feed port to 1200mmX600mm, and processed it into a movable flap with a rotating shaft and bearing. The extension shaft is welded at the bottom of the flap, and the detection sensor is installed through the opening of the outer bin plate. Under normal conditions, the movable flap maintains a vertical trend by gravity. An 8mm pad is added between the flap and the original outer guard plate to ensure that there is an 8mm gap between the outer flap and the original outer guard plate. It has two functions:

[0021] (1) The movable flap is maintained in a vertical position by gravity, but a certain inclination angle is maintained to ensure that gravity remains stable, to avoid the flap swinging caused by the vibration of coal feeding and coal falling, and to ensure the stability of the movable flap.

[0022] (2) A channel is reserved for the long iron objects and anchor rods that are parachuted down with the coal flow. The movable flap is not straight with the original outer guard plate. When the long iron objects push against the movable flap and slide down, they automatically move along the reserved gap between the movable flap and the original guard plate to ensure that the movable flap can be reliably pushed open and the reliability of detection and protection is guaranteed.

[0023] Since the original outer guard plate was processed into a movable flap, we installed a new outer guard plate 150mm outside the original outer guard plate. The guard plate and the coal bunker opening opened an opening of 1200mmX50mm. It has three functions:

[0024] (1) The new outer guard plate strengthens the structural rigidity of the feed port.

[0025] (2) When long iron objects are detected, the new outer guard plate ensures that the long iron objects are reliably limited to prevent them from extending too long or suddenly extending outward to cause harm to the inspectors. At the same time, the newly added outer guard plate can ensure that the long iron objects or anchor rods can be reliably stuck to prevent them from falling off and causing harm to the belt system.

[0026] (3) If there are small pieces of coal or gangue that collapse unexpectedly, they will automatically fall back into the feeding bin and onto the loading belt through the opening of the outer guard plate and the bin mouth, ensuring the safety of personnel and the cleanliness of the environment.

[0027] After repeated actual testing, it was found that long materials such as anchor rods, pipes, and wood, when they are longer than 1.55 meters, can be automatically screened and detected through the movable flap. For the coal flow system, the impact of long iron objects below 1600mm on the belt system is very small and will hardly cause damage to the belt.

[0028] The induction magnet or touch switch is used as an automatic screening detection sensor. It will be activated when the movable flap detects long materials or anchor rods. We have measured anchor rods, steel pipes, wood and steel bars with different diameters. The deflection position of the flap is shown in Table 1:

[0029] Material Name Material size Flap deflection size Remark Rebar Ф12mm, 1.6 meters 15mm Anchor Ф22mm, 1.6m 21mm board 20mm thick, 1.6 meters 20mm Steel pipe Ф24mm 1.6 meters 23mm

[0030] According to the test results, we adjusted the detection sensor according to the minimum deflection size of 15mm, ensuring that the movable flap deflects 12mm to ensure the reliable operation of the sensor. When the sensor detects the movement of the long iron, it passes through a delay device to prevent false operation, and then triggers a trigger to memorize the protection state.

[0031] The protection of the device is divided into two steps. First, after the memory trigger is actuated, the sound and light buzzer is output to provide sound and light alarms to alert operators and inspectors. Second, the output relay of the coal feeder is disconnected to stop the coal feeder from continuing to feed coal, so as to prevent the long iron objects or anchor rods from damaging the belt system when the coal feeder continues to operate. When the inspector removes the long iron objects and presses the reset button, the alarm and shutdown protection are lifted, and the coal feeder can continue to feed.

Claims

1. A belt coal feeding device capable of detecting and screening anchor rods and long materials, which automatically screens and detects anchor rods and long materials by rotating a flap when the length exceeds 1.55 meters, comprising a coal conveying belt arranged under a coal feeder, the coal feeder conveys coal horizontally into a discharge bin through a conveyor belt, and the discharge bin conveys the coal to the coal conveying belt, characterized in that: A rotating flap fixed by a shaft is provided in the unloading bin at an opening on the side wall of the unloading bin facing downward vertically opposite to the conveyor belt of the coal feeder. The bottom opening of the rotating flap is lower than the horizontal plane of the conveyor belt of the coal feeder. An outer protective frame plate is provided at a certain interval outside the rotating flap. The discharge channel opening of the unloading bin is arranged when it is inclined to the vertical state of the rotating flap. The rotating flap is maintained in a vertical trend by gravity and a certain inclination angle is maintained to ensure continuous and stable gravity. The interval between the outer protective frame plate and the rotating flap when they are perpendicular is not less than 150mm, ensuring that the coal blocks flowing into the interval enter the discharge channel opening, so that the detected anchor rods and long materials are stuck in the interval between the outer protective frame plate and the rotating flap. The interval is provided with a through opening at the bottom end that is connected to the discharge channel opening, and the through opening is on the side of the rotating flap, ensuring that the coal blocks flowing into the interval enter the discharge channel opening; A pad is provided on the plate surface opposite to the outer protection frame plate of the rotating flap, and when the rotating flap is reversed and opened, the pad ensures that the distance between the bottom surface of the rotating flap and the outer protection frame plate is not less than 8 mm; The inclination direction of the discharge channel opening is from bottom to top, counter to the running direction of the coal conveying belt; The inclined direction of the discharge channel opening is at an angle of 60 to 70 degrees to the horizontal of the coal conveyor belt; An inductive magnetic steel sensor is arranged on the rotating flap, and the inductive magnetic steel sensor is used to send out a fault signal when the rotating flap is pushed open by an anchor rod or a long material.

Images