Fully-closed interlocking induction coal unloading device of belt conveyor for underground coal mine

Abstract

The utility model aims to provide a fully-closed interlocking induction coal unloading device of a belt conveyor for an underground coal mine, which belongs to the technical field of coal mine conveying devices and comprises a shell, a feed port of the shell is communicated with one end of an upper horizontal belt conveyor, a lower horizontal belt conveyor is positioned below a discharge port of the shell, and the lower horizontal belt conveyor is positioned below the discharge port of the shell. A smoke device, a dust concentration monitoring device and a spraying and watering device are sequentially arranged at the top of the inner side of the shell, a first material receiving platform and a second material receiving platform are arranged on the vertical inner side wall of the shell, the first material receiving platform is located on the inner side wall of the end away from the upper horizontal belt conveyor, and the second material receiving platform is located on the inner side wall of the end close to the upper horizontal belt conveyor; moreover, the first material receiving platform is located above the second material receiving platform, a large material screening device is arranged below the second material receiving platform, and a rotatable vertical discharging opening is formed in a discharging opening of the shell. By using the material unloading device, the material unloading speed is reduced, and the material impact effect is avoided.

Description

Technical Field

[0001] This utility model belongs to the technical field of coal mine conveying devices, specifically relating to a fully enclosed interlocking induction coal unloading device for belt conveyors used in underground coal mines. Background Technology

[0002] In modern coal mine raw coal transportation, belt conveyors used underground are the main tool for transporting raw coal. As a type of continuous transportation machinery with large capacity, long conveying distance, wide conveying range, simple structure, and reliable operation, belt conveyors drive a drive drum through a drive unit, and the friction between the drum and the conveyor belt drives the entire belt to work together. This transmission method has a simple structure and saves energy.

[0003] Due to limitations imposed by underground geological conditions in coal mines and objective issues such as safety considerations during the initial stages of roadway excavation, there is a problem in the early stages of excavation for the main conveyor roadways: the conveyor belts in the main roadways overlap vertically and have significant height differences (e.g., exceeding four meters). Under these conditions, when transporting raw coal, uneven material loading, large material volume, and rapid unloading speed often cause the lower horizontal conveyor to deviate, experience wear, and become blocked.

[0004] Commonly used belt conveyor coal unloading systems mainly consist of smoke sensors, water spraying devices, and coal blocking devices. The unloading system is not fully enclosed; after the conveyor discharges material, it is directly thrown out through the unloading drum, impacting the coal blocking device of the lower horizontal conveyor. After the impact, the material flows into the lower horizontal conveyor belt and is transported out. During material unloading, the water spraying device needs to be manually activated to suppress dust at the unloading point, which presents the following main problems:

[0005] 1. Commonly used coal unloading systems are not fully enclosed, resulting in high concentrations of dust during unloading. Dust concentration monitoring at the coal unloading point of the underground belt conveyor revealed a concentration of 670 mg / m³ during unloading. 3 This severely reduces the quality of the working environment at the coal unloading point. Moreover, the reduced visibility due to dust makes it easy for accidents such as equipment operation errors to occur.

[0006] 2. In common coal unloading systems, the spraying and watering devices are mainly operated manually. During the entire conveyor belt transport of materials, the spraying and watering devices are always on. When the concentration of volatile dust from the material is low, they cannot be turned off in time, resulting in a large amount of water accumulation in the raw coal. This not only increases the amount of water and coal slurry in the transport roadway, but also easily causes the conveyor belt to run off track and slip under the action of water and coal slurry.

[0007] 3. In common coal unloading systems, after the material is unloaded from the upper horizontal conveyor, it directly impacts the coal-blocking device installed on the lower horizontal conveyor. After the impact, it flows into the conveyor belt. Taking a coal mine underground belt conveyor with an average operating speed of 3 m / s as an example, when the overlap height between the conveyor head and the lower horizontal conveyor is more than 3 m, the impact speed of the material after being thrown out reaches 5.6 m / s, which causes great damage to the coal-blocking device. Moreover, it has been measured that after the material rapidly impacts the coal-blocking device, the material's running speed decreases to 5.2 m / s, with little speed change. This results in a high-speed impact on the lower horizontal conveyor belt, which can easily cause the lower horizontal conveyor belt to deviate. At the same time, the material contains large coal gangue, which can easily get stuck at the unloading point, causing the conveyor belt to tear. Utility Model Content

[0008] This invention addresses the problems existing in coal unloading systems of conveyors with vertical overlap and significant height differences by providing a fully enclosed interlocking induction coal unloading device for belt conveyors in underground coal mines.

[0009] The present invention adopts the following technical solution:

[0010] A fully enclosed interlocking inductive coal unloading device for belt conveyors in underground coal mines includes a housing located between an upper horizontal belt conveyor and a lower horizontal belt conveyor. The inlet of the housing is connected to one end of the upper horizontal belt conveyor, and the lower horizontal belt conveyor is located below the outlet of the housing. A smoke device, a dust concentration monitoring device, and a spray water device are sequentially arranged on the top inner side of the housing. A receiving platform one and a receiving platform two are arranged on the vertical inner sidewall of the housing. The receiving platform one is located on the inner sidewall away from the upper horizontal belt conveyor, and the receiving platform two is located on the inner sidewall closer to the upper horizontal belt conveyor. The receiving platform one is located above the receiving platform two, and a large material screening device is arranged below the receiving platform two. The outlet of the housing is provided with a rotatable vertical discharge port.

[0011] Furthermore, the bottom of the receiving platform one and the receiving platform two are respectively provided with adjustment devices for adjusting the angle.

[0012] Furthermore, the bulk material screening device includes an infrared laser emitter and a receiver located at both ends of the housing.

[0013] Furthermore, the centerline of the rotatable vertical discharge port coincides with the centerline of the conveyor belt of the lower horizontal belt conveyor.

[0014] Furthermore, the coal unloading device also includes a PLC control cabinet, the signal output terminal of the dust concentration monitoring device is connected to the signal input terminal of the PLC control cabinet, and the signal output terminal of the PLC control cabinet is connected to the signal input terminal of the solenoid valve of the spray water device.

[0015] Furthermore, the signal output terminal of the smoke device is connected to the signal input terminal of the PLC control cabinet, and the signal output terminal of the PLC control cabinet is connected to the signal input terminal of the interlock switch of the motor of the upper horizontal belt conveyor.

[0016] Furthermore, the signal output terminal of the receiver of the large material screening device is connected to the signal input terminal of the PLC control cabinet, and the signal output terminal of the PLC control cabinet is connected to the signal input terminal of the interlock switch of the motor of the upper horizontal belt conveyor.

[0017] Furthermore, the outer casing has an inspection door on the side near the receiver, and an inspection platform is provided at one end of the inspection door.

[0018] The beneficial effects of this utility model are as follows:

[0019] 1. This utility model has a simple structure, is easy to operate, and has low cost. The cost of the vertically overlapping belt conveyor interlocking induction coal unloading device is only 5,000 yuan.

[0020] 2. This utility model reduces the material unloading speed by installing a receiving platform, effectively avoiding the phenomenon of the lower horizontal conveyor belt running off-center due to high unloading speed.

[0021] 3. This utility model realizes automatic sensing water spraying for dust suppression and automatic screening of large materials, which improves the level of automation during material unloading. Compared with traditional unloading devices, it avoids material jamming and belt tearing accidents caused by large materials on the lower level conveyor belt, while reducing the labor intensity of cleaning coal slime in small level transport roadways.

[0022] 4. The discharge port of this utility model is rotatable. During material unloading, the discharge port can be rotated manually to ensure that the material is evenly unloaded at the center of the lower horizontal conveyor belt, which can effectively prevent the lower horizontal conveyor belt from running off-center due to uneven force during unloading. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the PLC control principle of this utility model;

[0025] The components are: 1-outer shell; 2-smoke device; 3-dust concentration monitoring device; 4-spraying device; 5-receiving platform one; 6-receiving platform two; 7-rotatable vertical discharge port; 8-infrared laser emitter; 9-receiver; 10-PLC control cabinet; 11-solenoid valve; 12-inspection door; 13-inspection platform; 14-upper horizontal belt conveyor; 15-lower horizontal belt conveyor; 16-bottom belt; 17-roller; 18-H-frame. Detailed Implementation

[0026] The present invention will be further described with reference to the accompanying drawings.

[0027] As shown in the figure, a fully enclosed interlocking induction coal unloading device for belt conveyors in underground coal mines includes a housing 1 located between an upper horizontal belt conveyor 14 and a lower horizontal belt conveyor 15. The inlet of the housing 1 is connected to one end of the upper horizontal belt conveyor 14, and the lower horizontal belt conveyor 15 is located below the outlet of the housing 1. A smoke device 2, a dust concentration monitoring device 3, and a spray water device 4 are sequentially arranged on the top inner side of the housing 1. A receiving platform 1 5 and a receiving platform 2 6 are arranged on the vertical inner side wall of the housing 1. The receiving platform 1 5 is located on the inner side wall away from the upper horizontal belt conveyor 14, and the receiving platform 2 6 is located on the inner side wall close to the upper horizontal belt conveyor 14. The receiving platform 1 5 is located above the receiving platform 2 6, and a large material screening device is arranged below the receiving platform 2 6. The outlet of the housing 1 is provided with a rotatable vertical discharge port 7.

[0028] Furthermore, the bottom of the receiving platform 5 and the receiving platform 6 are respectively provided with adjustment devices for adjusting the angle.

[0029] Furthermore, the centerline of the rotatable vertical discharge port 7 coincides with the centerline of the conveyor belt of the lower horizontal belt conveyor 15.

[0030] Furthermore, the coal unloading device also includes a PLC control cabinet 10, the signal output terminal of the dust concentration monitoring device 3 is connected to the signal input terminal of the PLC control cabinet 10, and the signal output terminal of the PLC control cabinet 10 is connected to the signal input terminal of the solenoid valve 11 of the spray water device 4.

[0031] Furthermore, the signal output terminal of the smoke device 2 is connected to the signal input terminal of the PLC control cabinet 10, and the signal output terminal of the PLC control cabinet 10 is connected to the signal input terminal of the interlock switch of the motor of the upper horizontal belt conveyor 14.

[0032] Furthermore, the large material screening device includes an infrared laser emitter 8 and a receiver 9 located at both ends of the outer casing 1. The signal output terminal of the receiver 9 is connected to the signal input terminal of the PLC control cabinet 10, and the signal output terminal of the PLC control cabinet 10 is connected to the signal input terminal of the interlock switch of the motor of the upper horizontal belt conveyor 14.

[0033] Furthermore, the outer casing 1 is provided with an inspection door 12 on the side near the receiver 9, and an inspection platform 13 is provided at one end of the inspection door 12.

[0034] Among them: the smoke detector is a GQQ5 smoke sensor manufactured by Shandong Kaiyuan Mining Machinery Co., Ltd.; the dust concentration monitoring device is a GCG-1000 dust concentration sensor manufactured by Qingdao Juchuang Environmental Protection Co., Ltd.; the spray water device (including its control solenoid valve) is a ZP14.4(A)-Z intrinsically safe wireless automatic spray dust suppression device control box manufactured by Shandong Huarui Electric Co., Ltd.; the infrared laser transmitter and receiver are FYF4.0 intrinsically safe infrared transmitter and receiver manufactured by Shandong Kuangan Heavy Industry Co., Ltd.; and the PLC control cabinet is a KTC101 intrinsically safe system controller manufactured by Tianjin Huaning Electronics Co., Ltd.

[0035] The working principle of this utility model is as follows:

[0036] (1) When the material is transported by the upper horizontal belt conveyor 14, it is thrown out by the unloading roller and impacts the receiving platform 1 5. After the material impacts the receiving platform 1 5, it bounces and impacts the receiving platform 2 6 again. After the material is impacted twice by the receiving platform, the throwing speed is greatly reduced. Then, after passing through the material screening device and vertical discharge, it flows into the belt of the lower horizontal belt conveyor 15.

[0037] (2) The main functions of the fume device are twofold: First, because the main working principle of the belt conveyor is that the motor drives the drum to rotate, and the belt is driven to run by the rubber friction on the surface of the drum. Therefore, abnormal smoke will be generated at the friction points when the conveyor is running. In most cases, the smoke is small. Therefore, the fume protection is set to detect a concentration of 0.01 mg / m³. 3 Under normal circumstances (based on actual testing during conveyor startup, the on-site smoke concentration was 0.01-0.03 mg / m³),... 3 The PLC control cabinet 10 sends information A to the PLC control cabinet 10, which in turn sends an opening signal to the solenoid valve 11 to achieve high-pressure spraying; secondly, when belt misalignment occurs, friction occurs against the machine head frame, or belt slippage occurs under water-gas conditions, a large amount of smoke will be generated. According to field tests, when the smoke protection monitoring detects a concentration of 0.1 mg / m³, a large amount of smoke will be generated. 3 In this situation, the smoke protection system activates and simultaneously sends information B to the PLC control cabinet, which then controls the upper horizontal belt conveyor to stop.

[0038] (3) By testing the dust concentration during actual raw coal transportation, the dust concentration in front of the unloading drum under normal coal flow conditions was 200-600 mg / m³. 3 Therefore, when the dust concentration in front of the unloading drum is greater than 200 mg / m³, 3When the dust concentration monitoring device is set to the action value C, the monitoring device immediately performs a protection action and transmits the signal to the PLC control cabinet 10. After signal processing, the PLC control cabinet 10 issues a spray water start command, and the solenoid valve 11 immediately opens the spray water device 4 to reduce dust.

[0039] When the dust concentration in front of the unloading drum is less than 80mg / m³ 3 At the same time, the dust concentration monitoring device also sends a signal, which is processed by the PLC control cabinet 10 and sends a spray water shut-off command. After receiving the command, the solenoid valve 11 immediately shuts off the spray water device 4.

[0040] (4) When the conveyor is turned on, the normal operation signal of the upper horizontal belt is given to the PLC control cabinet 10 for interlocking. The interlocking signal connects the power supply of the large material screening device and turns on the infrared laser transmitter 8. Under normal material unloading conditions, the laser device emits continuous infrared rays. Under normal conditions, although the coal flow blocks the infrared signal, it is not continuous. Even under the maximum coal flow, the infrared signal reception interruption time is still no more than 10s. However, when large materials are present, they are blocked and accumulated when passing through the screening device filter screen. At this time, the infrared rays are blocked by the large materials. The receiver 9 cannot receive the continuous infrared rays. After 10s, the signal D is transmitted to the PLC control cabinet 10. The control cabinet processes the signal and sends a signal to turn off the power supply of the upper horizontal belt conveyor 14 motor. After receiving the instruction, the power supply of the conveyor motor is cut off in time.

[0041] (5) After the belt conveyor stops running, the operator enters the closed chamber through the maintenance door 12 to clean up large pieces of material in time. After the large pieces of material are cleaned up, the receiver 9 receives continuous infrared light again. Only when the PLC self-checks that the infrared signal reception is normal can the start command be sent to the motor to start. After receiving the start command, the power supply of the conveyor motor is connected in time and the conveyor starts running again.

[0042] There are two opening signals but only one closing signal for the upper-level solenoid valve of the spray sprinkler system. This is mainly to achieve two requirements when the conveyor is turned on: "start spraying upon startup" and "start spraying upon detection of coal dust." The purpose of "start spraying upon startup" is to eliminate the risk of fire through the spray device when the system is turned on. Therefore, signal A is set to last for 30 seconds (the reason for the 30-second setting is that under normal conditions, the time from the conveyor starting to its full-speed operation is set to be less than 30 seconds). After 30 seconds, signal A is interrupted. If the dust sensor does not send signal C, the solenoid valve will automatically close. The purpose of "start spraying upon detection of coal dust" is to reduce dust, and the two do not interfere with each other. The state where the spray stops when the coal dust concentration is not high enough during normal operation of the conveyor is the normal operating state.

[0043] By using this invention, the average dust concentration at the unloading point is controlled at 87 mg / m³. 3This improved the working environment at the unloading point. After unloading, the material speed was reduced to 2.4 m / s after passing through the receiving platform, which greatly reduced the material unloading speed and avoided the impact of the material. At the same time, the material screening device effectively reduced the accident rate of tearing of the lower horizontal conveyor belt caused by the large size of the material. It can save coal mines more than 600,000 yuan in costs per year.

[0044] This invention is simple to manufacture and inexpensive, and is suitable for all underground coal mines where vertical overlapping or transfer conveyor heads cause material conveying problems due to excessively high installation positions.

Claims

1. A fully enclosed interlocking inductive coal unloading device for belt conveyors in underground coal mines, characterized in that: The housing (1) includes an outer shell (1) located between an upper horizontal belt conveyor (14) and a lower horizontal belt conveyor (15). The inlet of the outer shell (1) is connected to one end of the upper horizontal belt conveyor (14). The lower horizontal belt conveyor (15) is located below the outlet of the outer shell (1). The inner top of the outer shell (1) is provided with a fume device (2), a dust concentration monitoring device (3), and a spray water device (4). The vertical inner wall of the outer shell (1) is provided with a receiving platform one (5) and a receiving platform two (6). The receiving platform one (5) is located on the inner wall away from the upper horizontal belt conveyor (14), and the receiving platform two (6) is located on the inner wall close to the upper horizontal belt conveyor (14). The receiving platform one (5) is located above the receiving platform two (6). A large material screening device is provided below the receiving platform two (6). The outlet of the outer shell (1) is provided with a rotatable vertical discharge port (7).

2. The fully enclosed interlocking induction coal unloading device for a belt conveyor in underground coal mines according to claim 1, characterized in that: The bottom of the receiving platform one (5) and the receiving platform two (6) are respectively provided with adjustment devices for adjusting the angle.

3. The fully enclosed interlocking inductive coal unloading device for a belt conveyor in underground coal mines according to claim 1, characterized in that: The centerline of the rotatable vertical discharge port (7) coincides with the centerline of the conveyor belt of the lower horizontal belt conveyor (15).

4. The fully enclosed interlocking induction coal unloading device for a belt conveyor in underground coal mines according to claim 1, characterized in that: The coal unloading device also includes a PLC control cabinet (10), the signal output terminal of the dust concentration monitoring device (3) is connected to the signal input terminal of the PLC control cabinet (10), and the signal output terminal of the PLC control cabinet (10) is connected to the signal input terminal of the solenoid valve (11) of the spray water device (4).

5. A fully enclosed interlocking inductive coal unloading device for a belt conveyor in underground coal mines according to claim 4, characterized in that: The signal output terminal of the smoke device (2) is connected to the signal input terminal of the PLC control cabinet (10), and the signal output terminal of the PLC control cabinet (10) is connected to the signal input terminal of the interlock switch of the motor of the upper horizontal belt conveyor (14).

6. A fully enclosed interlocking inductive coal unloading device for a belt conveyor in underground coal mines according to claim 4, characterized in that: The large material screening device includes an infrared laser emitter (8) and a receiver (9) located at both ends of the outer shell (1). The signal output terminal of the receiver (9) is connected to the signal input terminal of the PLC control cabinet (10). The signal output terminal of the PLC control cabinet (10) is connected to the signal input terminal of the interlock switch of the motor of the upper horizontal belt conveyor (14).

7. A fully enclosed interlocking inductive coal unloading device for a belt conveyor in underground coal mines according to claim 6, characterized in that: The outer casing (1) has an inspection door (12) on the side near the receiver (9), and an inspection platform (13) is provided at one end of the inspection door (12).

Images