Start-stop control device for return belt sweeper of coal belt conveyor

Abstract

The utility model relates to the technical field of electrical control, in particular to a start-stop control device for a return belt sweeper of a coal belt conveyor, which comprises a belt conveyor support, a belt conveyor carrier roller arranged on the belt conveyor support, and a rotary speed measurement target fixedly arranged on the belt conveyor carrier roller. A rotary detector is further fixedly arranged on the belt conveyor support and provided with a normally-open contact, and the normally-open contact of the rotary detector is connected with a control circuit of the return belt sweeper in series. The remote starting and stopping device saves signal cable material cost needed by remote starting and stopping of the electric return belt sweeper, reduces construction cost and project investment cost, and is simple, practical, low in cost, easy to maintain and high in reliability.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical control, and is a start-stop control device for a return belt cleaner of a coal conveyor belt. Background Art

[0002] Coal storage yards at coal chemical and thermal power plants are typically located far from the edges or corners of the plant complex. Raw coal or fuel coal is transported to the coal-using end-user via long-distance coal conveyor trestles. During the raw coal transportation process, in addition to protecting the conveyor belts from tearing and slipping, dust control measures are also necessary within the trestles due to vibration from the conveying equipment, drop in the coal conveyor, and dry coal dust.

[0003] During the return journey of the conveyor belt conveyor after unloading, coal dust attached to the belt falls off due to roller rotation, belt vibration, and surrounding vibration. This causes dust to be raised inside the trestle. Electric return belt cleaners are now required to promptly clean the return belt conveyor after unloading to reduce dust raised inside the coal conveyor trestle. To achieve timely cleaning and avoid excessive equipment wear and energy waste, it is necessary to synchronize the start and stop control of the electric return belt cleaner with the main conveyor belt.

[0004] At present, coal conveyor bridges are widely distributed, and the belt conveyors and stretching rooms are relatively dispersed. If the control signal of each electric return belt cleaner is taken from the cabinet room of the coal storage and transportation control room, it will not only increase the cost of a large amount of signal cable materials from each belt conveyor site to the cabinet room of the coal storage and transportation control room, but also increase the construction cost, and will also increase the number of I / O cards in the DCS cabinet room of the coal storage and transportation control room. Adding an electric return belt cleaner to the belt conveyor will result in high investment cost and high installation cost. Utility Model Content

[0005] The utility model provides a start-stop control device for a return belt cleaner of a coal conveyor belt conveyor, which overcomes the shortcomings of the above-mentioned prior art and can effectively solve the problem that the control signal of each electric return belt cleaner is taken from the cabinet room of the coal storage and transportation control room, resulting in high investment cost and high installation cost.

[0006] The technical solution of the present utility model is achieved through the following measures: a start-stop control device for a return belt cleaner of a coal conveyor belt conveyor, comprising a belt conveyor bracket, a belt conveyor roller is provided on the belt conveyor bracket, and a rotating speed measuring target is fixedly provided on the belt conveyor roller; a rotating detector is also fixedly provided on the belt conveyor bracket, and the rotating detector is provided with a normally open contact, and the normally open contact of the rotating detector is connected in series with the control circuit of the return belt cleaner.

[0007] The following are further optimizations and / or improvements to the above-mentioned utility model technical solution:

[0008] A sweeper electric control box may also be provided, and the normally open contact of the rotation detector is connected to the sweeper electric control box.

[0009] The above-mentioned rotation detector may be provided with a rotation speed setting knob.

[0010] An automatic / manual selection switch may be provided on the electric control box of the above-mentioned cleaner, and the automatic / manual selection switch is electrically connected to the control circuit of the return belt cleaner.

[0011] It also includes a control system, which can be provided with a switch input module. The switch input module of the control system is electrically connected to the normally open contact of the rotation detector.

[0012] The above control system can be a PLC or DCS control system.

[0013] This utility model utilizes the rollers on site next to the belt conveyor to select the nearest control point to achieve synchronous start and stop control of the electric return belt cleaner, saving the signal cable material cost required for remote start and stop of the electric return belt cleaner, while reducing construction costs, and reducing the I / O card component occupancy between the DCS cabinets in the coal storage and transportation control room, reducing project investment costs. For old equipment that has been put into operation, this utility model can simply and efficiently implement the implementation of the electric return belt cleaner dust removal modification project without affecting the operation of the original system, saving signal cable material cost and construction cost while not affecting the continuous operation of the original system. This utility model can also control the synchronous start and stop of the electric return belt cleaner and the belt conveyor through the DCS system. The rotating detector can realize the automatic setting of the speed according to the needs of use. The DCS system and the belt conveyor are independent of each other. The failure of the electric return belt cleaner will not affect the belt conveyor. It is simple and practical, low-cost, easy to maintain, and highly reliable. This utility model can be independently implemented without relying on a PLC or DCS control system, making it simple and convenient. It is particularly advantageous for environmentally friendly retrofit projects on existing production equipment, as it not only reduces the difficulty of retrofit implementation but also reduces the investment costs of equipment and cables, thus reducing construction difficulty and saving installation costs. The utility model has a simple structure, low cost, and fast and accurate signal output. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view structural schematic diagram of an embodiment of the utility model.

[0015] Figure 2 It is a side structural schematic diagram of an embodiment of the utility model.

[0016] Figure 3 This is a schematic structural diagram of the electric control box of the sweeper according to an embodiment of the present utility model.

[0017] Figure 4 This is a control principle diagram of the electric control box of the sweeper according to an embodiment of the present utility model.

[0018] Figure 5Schematic diagram of the contacts of the automatic / manual selection switch according to an embodiment of the present utility model.

[0019] The codes in the accompanying drawings are: 1 is the belt conveyor bracket, 2 is the belt conveyor roller, 3 is the rotating speed measuring target, 4 is the rotating detector, 5 is the fixed bracket, 6 is the adjustable fixing hole, 7 is the sweeper electric control box, 8 is the sweeper drive motor, 9 is the sweeper drive reducer, 10 is the sweeper brush roller, 11 is the sweeper brush, 12 is the speed setting knob, 13 is the belt; N is the neutral wire, L1 is the live wire, QF1 is the circuit breaker, SS1 is the emergency stop button, SA is the automatic / manual selection switch, SB1 is the start button, SB2 is the stop button, KM is the contactor coil, KM11 and KM12 are the normally open contacts of the contactor, KM21 is the normally closed contact of the contactor, FR11 is the normally open contact of the thermal relay, FR12 is the normally closed contact of the thermal relay, KA is the intermediate relay coil, KA11 is the normally open contact of the intermediate relay, HR is the running indicator light, HY is the fault indicator light, and HG is the stop indicator light. DETAILED DESCRIPTION

[0020] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0021] The present invention will be further described below in conjunction with the embodiments:

[0022] Example 1: As shown in the attached Figure 1 、 2 As shown in Figures 3, 4, and 5, the start-stop control device for the return belt cleaner of the coal conveyor belt conveyor includes a belt conveyor bracket, a belt conveyor roller is provided on the belt conveyor bracket, and a rotating speed measuring target is fixedly provided on the belt conveyor roller; a rotating detector is also fixedly provided on the belt conveyor bracket, and the rotating detector is provided with a normally open contact, and the normally open contact of the rotating detector is connected in series with the control circuit of the return belt cleaner. In an embodiment of the present utility model, the start-stop control device for the return belt cleaner of the coal conveyor belt conveyor is also provided with a cleaner electric control box, and the normally open contact of the rotating detector is connected to the cleaner electric control box. The rotating detector is provided with a speed setting knob, and the speed setting value of the rotating detector is adjustable. In specific applications, it can be set by adjusting its speed setting knob according to the actual speed range of the belt conveyor to meet the applicable range of different speeds.

[0023] In an embodiment of the present invention, a rotating speed target is mounted on a conveyor belt roller, rotating and stopping synchronously with the conveyor belt roller. A rotating detector can be mounted on a fixed bracket, which is mounted on the conveyor belt bracket. When the conveyor belt rotates, the rotating speed target mounted on the conveyor belt roller rotates synchronously. The rotating detector detects the rotating speed of the rotating speed target. When the speed reaches or exceeds a set value, the normally open contacts of the rotating detector trigger and output a set of closed signals. These signals can be transmitted to the electrical control box of the return belt cleaner installed near the conveyor belt. The electrical control box can automatically control the operation of the return belt cleaner based on this closed signal. When the conveyor belt issues a stop command, the conveyor belt speed will decrease, and the speed of the rotating speed target mounted on the conveyor belt roller will also decrease synchronously. The rotating detector detects the rotating speed of the rotating speed target. When the speed falls below the set value, the rotating detector outputs a closed signal, thereby stopping the return belt cleaner.

[0024] In an embodiment of the present invention, rollers at appropriate locations next to each belt conveyor in the coal conveyor trestle are selected as speed detection locations and are converted into rotating speed measurement targets. The rotation range of the rotating speed measurement target is determined, and a rotating detector is installed at an appropriate location on the bracket next to the roller. A suitable location of the rotating speed measurement target next to the roller is determined and a rotating detector is installed; the rotating speed of the roller is measured by a speed meter, and the speed value is set into the detector; the output signal of the rotating detector is used to realize automatic control of the start and stop of the return belt cleaner in synchronization with the belt conveyor. In specific applications, the speed operating range of the rotating detector can be set according to the actual operating speed of the belt conveyor based on the use requirements to avoid erroneous start and stop caused by entering the detection area for maintenance, cleaning, etc.

[0025] In the embodiment of the present invention, the sweeper's electrical control box and drive motor can be manufactured as triple-proof or explosion-proof products, depending on the environment of use. Their explosion-proof ratings can meet the requirements for use in dust explosion hazardous locations, as well as explosive gas environments, complying with the relevant standards Ex dbebⅡCT4Gb / Ex tbⅡICT80℃Db. In the embodiment of the present invention, the sweeper's electrical control box and drive motor can be configured with a maximum capacity of 3kW, meeting the cleaning needs of various types of conveyor belts on-site.

[0026] This embodiment utilizes the rollers on-site near the conveyor to select the nearest control point to achieve synchronous start and stop control of the electric return belt cleaner, saving the signal cable material costs required for remote start and stop of the electric return belt cleaner, while reducing construction costs, and reducing the I / O card component usage between the DCS cabinets in the coal storage and transportation control room, thereby reducing project investment costs. For old equipment that has been put into operation, this embodiment can simply and efficiently implement the implementation of the dust removal modification project for the electric return belt cleaner without affecting the operation of the original system, saving signal cable material costs and construction costs while not affecting the continuous operation of the original system. This embodiment can also use the DCS system to control the synchronous start and stop of the electric return belt cleaner and the conveyor. The rotation detector can realize the automatic setting of the speed according to the needs of use. The DCS system and the conveyor are independent of each other, and the failure of the electric return belt cleaner will not affect the conveyor. It is simple, practical, low-cost, easy to maintain, and highly reliable. This embodiment can be independently implemented without relying on a PLC or DCS control system, making it simple and convenient. It is particularly advantageous for environmentally friendly retrofit projects on existing production equipment, as it not only reduces the difficulty of retrofit implementation but also reduces the investment costs of equipment and cables, thus reducing construction difficulty and saving installation costs. The utility model has a simple structure, low cost, and fast and accurate signal output.

[0027] Example 2: As shown in the attached Figure 1 、 2 As shown in Figures 3, 4, and 5, the start / stop control device for the return belt cleaner of the coal conveyor belt conveyor is equipped with an automatic / manual selector switch on the cleaner's electrical control box. The automatic / manual selector switch is electrically connected to the control circuit of the return belt cleaner. By operating the automatic / manual selector switch on the belt cleaner's electrical control box, the return belt cleaner can be started and stopped synchronously with the conveyor belt, achieving the most convenient automatic control. By operating the automatic / manual selector switch on the belt cleaner's electrical control box, the return belt cleaner can be started and stopped locally, facilitating on-site operation and maintenance of the equipment.

[0028] Example 3: As shown in the attached Figure 1 、 2 As shown in Figures 3, 4, and 5, the start-stop control device for the return belt cleaner of the coal conveyor belt conveyor further includes a control system, which is provided with a switch input module. The switch input module of the control system is electrically connected to the normally open contact of the rotation detector. In an embodiment of the utility model, the control system can be any one of a PLC or a DCS control system. The PLC or DCS control system is used to control the synchronous start and stop of the electric return belt cleaner and the belt conveyor. The rotation detector can be set according to the needs of use. The detection system and the belt conveyor system are independent of each other. Failure of the electric return belt cleaner does not affect the belt conveyor. The utility model is simple, practical, low-cost, easy to maintain, and highly reliable.

[0029] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the requirements of different situations.

Claims

1. A start-stop control device for a return belt cleaner of a coal conveyor belt conveyor, characterized in that It includes a belt conveyor bracket, a belt conveyor roller is provided on the belt conveyor bracket, and a rotating speed measuring target is fixedly provided on the belt conveyor roller; a rotating detector is also fixedly provided on the belt conveyor bracket, and the rotating detector is provided with a normally open contact, and the normally open contact of the rotating detector is connected in series with the control circuit of the return belt cleaner.

2. The start-stop control device for the return belt cleaner of the coal conveyor belt conveyor according to claim 1 is characterized in that A sweeper electric control box is also provided, and the normally open contacts of the rotation detector are connected to the sweeper electric control box.

3. The start-stop control device for the return belt cleaner of the coal conveyor belt according to claim 2 is characterized in that The rotating detector is equipped with a speed setting knob.

4. The start-stop control device for the return belt cleaner of the coal conveyor belt conveyor according to claim 2 is characterized in that An automatic / manual selection switch is provided on the electric control box of the cleaner, and the automatic / manual selection switch is electrically connected to the control circuit of the return belt cleaner.

5. The start-stop control device for the return belt cleaner of the coal conveyor belt conveyor according to claim 3 is characterized in that An automatic / manual selection switch is provided on the electric control box of the cleaner, and the automatic / manual selection switch is electrically connected to the control circuit of the return belt cleaner.

6. The start-stop control device for the return belt cleaner of the coal conveyor belt according to claim 1, 2, 3, 4 or 5, characterized in that It also includes a control system, which is provided with a switch input module. The switch input module of the control system is electrically connected to the normally open contact of the rotation detector.

7. The start-stop control device for the return belt cleaner of the coal conveyor belt according to claim 6 is characterized in that The control system is a PLC or DCS control system.

Images