Blanking hopper material accumulation detection device for coal blending system

Abstract

The utility model relates to a device for detecting material accumulation of a blanking hopper for a coal blending system, which comprises a protection box, a rubber sheet, a speed sensor and a frequency converter, the frequency converter is connected with a motor of a belt conveyor and used for driving the belt conveyor to operate, the protection box comprises a door shaft, a swing door, a proximity switch and a proximity switch support, the protection box is provided with the door shaft, and the swing door is hinged with the door shaft. The door shaft is fixed to the side wall of the discharging hopper, the proximity switch support is arranged in the protection box, the proximity switch is fixed to the proximity switch support, the rubber sheet is fixed to the side wall of the discharging hopper, and the swing door abuts against the rubber sheet. The protection box is simple in structure, and the proximity switch is installed in the protection box and can be effectively prevented from being damaged when materials pass through the discharging hopper. The rubber sheet is fixed on the side wall of the discharging hopper, so that misoperation of the proximity switch is effectively prevented; the frequency converter controls the speed of the belt conveyor to reduce the power consumption of the belt conveyor; the shutdown frequency of the belt conveyor is reduced, and production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a device for detecting material accumulation in a blanking hopper for a coal blending system. Background Art

[0002] Material transportation is an important link in the coal blending system. During the belt transportation process, materials adhere to the corners of the blanking hopper after passing through the blanking hopper. Over time, phenomena such as material hanging, piling, and leakage often occur. When the above phenomena occur, the belt conveyor does not receive an alarm or stop signal in a timely manner, does not take remedial measures, and continues to transport materials. The materials overflow at the blanking hopper, and the belt will be scratched or even worn out, shortening the service life of the belt, resulting in unstable production operation and waste of electric energy. Summary of the Invention

[0003] To overcome the deficiencies of the prior art, the purpose of the utility model is to provide a device for detecting material accumulation in a blanking hopper for a coal blending system, which can timely monitor the material piling phenomenon in the blanking hopper, extend the service life of the belt, and increase the reliability and stability of the equipment.

[0004] To achieve the above purpose, the utility model is realized through the following technical solutions:

[0005] A device for detecting material accumulation in a blanking hopper for a coal blending system includes a blanking hopper and a belt conveyor. The belt conveyor is arranged above the blanking hopper. It further includes a protection box, a rubber sheet, a speed sensor, and a frequency converter. A speed sensor is arranged on the driving roller of the belt conveyor. The frequency converter is connected to the belt conveyor motor for driving the belt conveyor to operate. The protection box includes a door shaft, a swinging door, a proximity switch, and a proximity switch bracket. The protection box is provided with a door shaft, and the swinging door is hinged to the door shaft. The door shaft is fixed on the side wall of the blanking hopper. A proximity switch bracket is arranged inside the protection box, and the proximity switch is fixed on the proximity switch bracket. The rubber sheet is fixed on the side wall of the blanking hopper, and the swinging door is in contact with the rubber sheet.

[0006] It further includes a coal blending room engineer station, a PLC, and an isolator group. The coal blending room engineer station includes an HMI human-machine interaction screen. The HMI human-machine interaction screen is connected to the PLC through a port. The output end of the isolator group is connected to the PLC through a port. The input ends of the isolator group are respectively connected to the speed sensor and the proximity switch through ports. The frequency converter is connected to the PLC through a port.

[0007] The PLC includes a CPU module, a digital input module, and a communication module. The CPU module, the digital input module, and the communication module are connected through ports. The CPU module is connected to the HMI human-machine interaction screen through a communication port. The digital input module is connected to the output end of the isolator group through a port. The frequency converter is provided with a communication card, and the communication card is connected to the communication module.

[0008] The isolator group includes several isolators.

[0009] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0010] 1. The protection box has a simple structure, and the proximity switch is installed in the protection box, which can effectively prevent the proximity switch from being damaged when the material passes through the feed hopper.

[0011] 2. The rubber sheet is fixed on the side wall of the feed hopper, which can effectively prevent material particles from getting stuck at the swinging door and causing misoperation of the proximity switch.

[0012] 3. A speed sensor is provided on the driving roller of the belt conveyor. The frequency converter is connected to the motor of the belt conveyor. The frequency converter is provided with a communication card, and the communication card is connected to the communication module. Maintenance personnel can view the operating status of the belt conveyor at any time through the HMI human-machine interface screen, which is convenient for maintenance, shortens the maintenance time, the frequency converter drives the belt conveyor to operate, and there is no need to frequently start and stop the equipment, prolongs the service life of the equipment, and reduces the power consumption of the belt conveyor.

[0013] 4. The output end of the isolator group is connected to the PLC through a port to prevent the PLC from being damaged due to the damage of the speed sensor and the proximity switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of an embodiment

[0015] Figure 2 It is a schematic diagram of the protection box.

[0016] Figure 3 It is a schematic diagram of the inside of the protection box

[0017] In the figure: 1 - protection box; 2 - door shaft; 3 - swinging door; 4 - proximity switch bracket; 5 - proximity switch; 6 - control room; 7 - rubber sheet; 8 - feed hopper; 9 - belt conveyor; 11 - speed sensor; 12 - PLC; 13 - frequency converter; 14 - coal blending room engineer station; 15 - isolator group. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The present utility model will be described in detail below with reference to the accompanying drawings of the specification, but it should be noted that the implementation of the present utility model is not limited to the following embodiments.

[0019] The following embodiments are implemented on the premise of the technical solution of the present utility model, and detailed implementation manners and specific operation processes are given, but the protection scope of the present utility model is not limited to the following embodiments. The methods used in the following embodiments are all conventional methods unless otherwise specified.

[0020]

Embodiment

[0021] See Figure 1 , Figure 2 , Figure 3, before the transformation, the belt conveyor adopted the star-delta starting method, and after the transformation, the belt conveyor was driven by a frequency converter. A device for detecting material accumulation in a bunker for a coal blending system, including a control room 6, a protection box 1, a rubber sheet 7, a belt conveyor 9, a speed sensor 11, a frequency converter 13, and a bunker 8. The belt conveyor 9 is arranged above the bunker 8. A speed sensor 11 is arranged on the driving roller of the belt conveyor 9. The frequency converter 13 is connected to the motor of the belt conveyor 9 through a port. The protection box 1 includes a door shaft 2, a swinging door 3, a proximity switch 5, and a proximity switch bracket 4. The protection box 1 is provided with a door shaft 2. The swinging door 3 is hinged to the door shaft 2. The door shaft 2 is fixed on the side wall of the bunker 8. A proximity switch bracket 4 is arranged inside the protection box 1. The proximity switch 5 is fixed on the proximity switch bracket 4. The rubber sheet 7 is fixed on the side wall of the bunker 8. The swinging door 3 abuts against the rubber sheet 7.

[0022] The control room 6 includes a coal blending room engineer station 14, a PLC 12, and an isolator group 15. The coal blending room engineer station 14 is provided with a master station PLC. The master station PLC is connected to the communication module 2 of the PLC 12 for realizing data exchange between the coal blending room engineer station 14 and the master station PLC. The HMI human-machine interaction screen of the coal blending room engineer station 14 is connected to the PLC 12 through a communication port. The output end of the isolator group 15 is connected to the digital input module of the PLC 12 through a port. The input end of the isolator group 15 is connected to the speed sensor 11 and the proximity switch 16 through ports. The communication card of the frequency converter 13 is connected to the communication module 1 of the PLC 12 through a communication port. The PLC includes a CPU module, a digital input module, a communication module 1, and a communication module 2. The CPU module, the digital input module, the communication module 1, and the communication module 2 are connected through ports. Working process:

[0023] As Figure 1 shown, an opening is made on the side wall of the bunker 8. The rubber sheet 7 is fixed at the opening on the side wall of the bunker 8. The door shaft 2 is fixed above the side wall of the bunker 8. When the material overflows in the bunker 8, the material squeezes the rubber sheet 7. The rubber sheet 7 deforms and drives the swinging door 3 to move inwardly along with the door shaft 2. The proximity switch 5 sends the action signal of the swinging door 3 to the PLC 12 through the isolator group 15. The PLC 12 controls the belt conveyor 9 to run at zero speed through the frequency converter 13. The speed sensor 11 sends the zero-speed running signal to the HMI human-machine interaction screen of the coal blending room engineer station 14 through the port of the isolator group 15 for display. At the same time, the PLC 12 sends an alarm message of material overflow to the HMI human-machine interaction screen of the coal blending room engineer station 14 through the communication port. After the maintenance worker clears the material in the bunker 8, the coal blending room engineer station 14 sends a resume operation instruction. The frequency converter 13 controls the belt conveyor 9 to operate and resumes the production state.

[0024] For this utility model, the protective box has a simple structure. The proximity switch is installed in the protective box, which can effectively prevent the proximity switch from being damaged when materials pass through the feed hopper. The rubber sheet is fixed on the side wall of the feed hopper, which can effectively prevent material particles from getting stuck at the wandering door and causing misoperation of the proximity switch. A speed sensor is set on the driving roller of the belt conveyor. The frequency converter is connected to the motor of the belt conveyor. The frequency converter is provided with a communication card, and the communication card is connected to the communication module. Maintenance personnel can view the operating status of the belt conveyor at any time through the HMI human-machine interface screen, which is convenient for maintenance, shortens the maintenance time, the frequency converter drives the belt conveyor to operate, there is no need to frequently start and stop the equipment, the service life of the equipment is extended, and the power consumption of the belt conveyor is reduced. The output end of the isolator group is connected to the PLC through a port, preventing damage to the PLC caused by damage to the speed sensor and proximity switch.

Claims

1. A device for detecting material accumulation in a lower hopper of a coal blending system, comprising a lower hopper and a belt conveyor, wherein the belt conveyor is arranged above the lower hopper, and is characterized in that: It also includes a protection box, rubber, a speed sensor, and a frequency converter. The speed sensor is arranged on the driving roller of the belt conveyor. The frequency converter is connected to the belt conveyor motor and is used to drive the belt conveyor to operate. The protection box includes a door shaft, a swinging door, a proximity switch, and a proximity switch bracket. The protection box is provided with a door shaft, the swinging door is hinged to the door shaft, the door shaft is fixed to the side wall of the lower hopper, a proximity switch bracket is arranged inside the protection box, the proximity switch is fixed on the proximity switch bracket, the rubber is fixed to the side wall of the lower hopper, and the swinging door is in contact with the rubber.

2. The device for detecting material accumulation in the lower hopper of a coal blending system according to claim 1, characterized in that: It also includes a coal blending room engineer station, PLC, and an isolator group. The coal blending room engineer station includes an HMI human-machine interaction screen. The HMI human-machine interaction screen is connected to the PLC through a port, the output end of the isolator group is connected to the PLC through a port, the input end of the isolator group is respectively connected to the speed sensor and the proximity switch through ports, and the frequency converter is connected to the PLC through a port.

3. The device for detecting material accumulation in the lower hopper of a coal blending system according to claim 2, characterized in that: The PLC includes a CPU module, a digital input module, and a communication module. The CPU module, the digital input module, and the communication module are connected through a port. The CPU module is connected to an HMI human-machine interaction screen through a communication port. The digital input module is connected to an output end of an isolator group through a port. The frequency converter is provided with a communication card, and the communication card is connected to the communication module.

4. The device for detecting material accumulation in the lower hopper of a coal blending system according to claim 3, characterized in that: The isolator group includes a plurality of isolators.

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