Novel coal conveying belt speed measurement alarm instrument

Abstract

The utility model relates to the technical field of coal conveying belt monitoring, in particular to a novel coal conveying belt speed measurement alarm instrument which comprises a rack and a roller belt conveyor installed on the rack, and a plurality of rollers are arranged on the roller belt conveyor. The permanent magnet is arranged on the rack, a detection end of the magnetoelectric switch is arranged opposite to the permanent magnet, the support is used for installing the magnetoelectric switch on the rack, the controller is electrically connected with the magnetoelectric switch, the permanent magnet and the axis of the roller are arranged in a staggered mode, and the controller is electrically connected with an alarm. According to the utility model, the condition that the contact surface of the tachometer roller and the belt is abraded and damaged due to continuous friction between the belt and the tachometer roller can be effectively avoided, and the condition that the tachometer roller does not rotate or is improperly positioned due to the damage of the tachometer, the belt is torn, and the normal operation of the tachometer and the belt is influenced can be avoided.

Description

Technical Field

[0001] This utility model relates to the field of coal conveyor belt monitoring technology, specifically a new type of coal conveyor belt speed measuring and alarm device. Background Technology

[0002] In thermal power plants, the coal conveying system is a crucial raw material supply system. The coal required for combustion in the boiler furnace is transported to the boiler coal hopper via conveyor belts. Conveyor belt speed meters are installed on each belt and are important measuring points. If the conveyor belt speed meter is damaged, it may tear the belt, causing the conveyor belt to stop operating. The incoming coal will not be transported to the boiler normally. This can lead to insufficient pulverized coal in the furnace and reduced boiler output, or even boiler coal shortage and trigger a boiler MFT (Main Fuel Turbine Default). Therefore, accurate conveyor belt speed measurement can ensure precise coal feeding and avoid unit load fluctuations and equipment failures.

[0003] In practice, it was found that the original speed measuring instrument was damaged because: the original coal conveyor belt speed measuring instrument was fixed on the belt, and the roller of the speed measuring instrument rotated with the movement of the belt. The continuous friction between the belt and the roller of the speed measuring instrument made the contact surface between the roller of the speed measuring instrument and the belt prone to wear and damage. In addition, when the speed measuring instrument was damaged, the belt may be torn due to the roller of the speed measuring instrument not rotating or being improperly positioned, which would affect the normal operation of the speed measuring instrument and the belt. Utility Model Content

[0004] The purpose of this utility model is to address the above-mentioned shortcomings by providing a new type of coal conveyor belt speed measuring alarm, which can effectively avoid wear and damage to the contact surface between the speed measuring roller and the belt caused by continuous friction between the belt and the speed measuring roller, and also avoid the situation where the speed measuring roller does not rotate or is improperly positioned due to damage to the speed measuring instrument, resulting in belt tearing and affecting the normal operation of the speed measuring instrument and the belt.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A novel coal conveyor belt speed measuring and alarm device includes a frame, a roller conveyor belt mounted on the frame, and multiple rollers arranged on the roller conveyor belt. The device is characterized by: a permanent magnet fixed to the end of each roller; a magnetoelectric switch with its detection end facing the permanent magnet; a bracket for mounting the magnetoelectric switch on the frame; a controller electrically connected to the magnetoelectric switch; the permanent magnet being offset from the axis of the roller; and an alarm being electrically connected to the controller.

[0007] Furthermore, the magneto-electric switch is connected to the bracket via an adjustment structure, which is used to adjust the distance between the detection end of the magneto-electric switch and the end of the roller.

[0008] Furthermore, the adjustment structure includes a circular sleeve fixedly fitted on the magneto-electric switch, and a circular ring welded and fixed to the top of the bracket. The outer surface of the circular sleeve is provided with an external thread, and the inner surface of the circular ring is provided with an internal thread that is screwed onto the external thread.

[0009] Furthermore, the distance between the detection end of the magnetoelectric switch and the end of the roller directly opposite is in the range of 5 to 10 mm.

[0010] Furthermore, the bottom end of the bracket is welded and fixed to the frame.

[0011] Furthermore, the permanent magnet is a circular magnetic sheet, and the maximum outer diameter of the circular magnetic sheet is smaller than the radius of the roller.

[0012] Furthermore, the model of the magnetoelectric switch is CT15-G30-C1 magnetoelectric switch.

[0013] The beneficial effects of this utility model are:

[0014] In practical applications, as the rollers roll along the roller conveyor belt, the permanent magnet rotates with the rollers. When the permanent magnet rotates to face the magneto-electric switch, the magneto-electric switch detects a pulse signal and transmits the detected pulse signal to the controller. Under normal circumstances, the signal frequency returned by the magneto-electric switch is constant. When the belt slips, the signal frequency returned by the magneto-electric switch becomes abnormal, and the controller controls the alarm to issue an alarm signal. This invention can effectively avoid wear and damage to the contact surface between the speedometer rollers and the belt caused by continuous friction between the belt and the speedometer rollers. It can also prevent damage to the speedometer rollers from not rotating or being improperly positioned, which could lead to belt tearing and affect the normal operation of the speedometer and the belt. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the roller, permanent magnet, magneto-electric switch and bracket in this utility model;

[0017] Reference numerals: 1. Frame; 2. Roller belt conveyor; 21. Roller; 3. Permanent magnet; 4. Magnetoelectric switch; 5. Bracket; 6. Controller; 7. Alarm; 81. Circular sleeve; 811. External thread; 82. Circular ring. Detailed Implementation

[0018] like Figure 1 and Figure 2As shown, a novel coal conveyor belt speed measuring and alarm device includes a frame 1, a roller conveyor 2 mounted on the frame 1, and multiple rollers 21 arranged on the roller conveyor 2. The device is characterized by: a permanent magnet 3 fixed to the end of each roller 21; a magnetoelectric switch 4 with its detection end facing the permanent magnet 3; a bracket 5 for mounting the magnetoelectric switch 4 on the frame 1; a controller 6 electrically connected to the magnetoelectric switch 4; the permanent magnet 3 and the roller 21 are offset from each other in axis; the magnetoelectric switch 4 and the roller 21 are also offset from each other in axis; and the controller 6 is electrically connected to an alarm 7.

[0019] During the conveying and rolling process of roller 21 with roller belt conveyor 2, permanent magnet 3 rotates with roller 21. When permanent magnet 3 rotates to face magneto-electric switch 4, magneto-electric switch 4 detects a pulse signal and transmits the detected pulse signal to controller 6. Under normal circumstances, the signal frequency returned by magneto-electric switch 4 is constant. When the belt slips, the signal frequency returned by magneto-electric switch 4 is abnormal, and controller 6 controls alarm 7 to issue an alarm signal. The permanent magnet 3 is bonded and fixed to the end of roller 21. This utility model can effectively avoid the wear and damage of the contact surface between the speed measuring roller and the belt caused by continuous friction between the belt and the speed measuring roller. It can also avoid the situation where the speed measuring roller does not rotate or is improperly positioned due to damage to the speed measuring instrument, resulting in belt tearing and affecting the normal operation of the speed measuring instrument and the belt.

[0020] like Figure 1 and Figure 2 As shown, the magnetoelectric switch 4 and the bracket 5 are connected by an adjustment structure, which is used to adjust the distance between the detection end of the magnetoelectric switch 4 and the end of the roller 21. In this embodiment, the distance between the detection end of the magnetoelectric switch 4 and the end of the roller 21 can be adjusted by the adjustment structure.

[0021] like Figure 1 and Figure 2 As shown, the adjustment structure includes a circular sleeve 81 fixedly sleeved on the magneto-electric switch 4 and a circular ring 82 welded and fixed to the top of the bracket 5. The outer side of the circular sleeve 81 is provided with an external thread 811, and the inner side of the circular ring 82 is provided with an internal thread that screws the external thread 811. In this embodiment, the magneto-electric switch 4 can adjust the distance between the detection end of the magneto-electric switch 4 and the end of the roller 21 directly opposite it by screwing the external thread 811 on the circular sleeve 81 to the internal thread.

[0022] like Figure 1 and Figure 2 As shown, the distance between the detection end of the magnetoelectric switch 4 and the end of the roller 21 is 5-10 mm. In this embodiment, the detection result is more accurate when the distance between the detection end of the magnetoelectric switch 4 and the end of the roller 21 is 5-10 mm.

[0023] like Figure 1 and Figure 2 As shown, the bottom end of the bracket 5 is welded and fixed to the frame 1; in this embodiment, the frame 1 is fixed by welding the bottom end of the bracket 5, and the connection is firm and reliable.

[0024] like Figure 1 and Figure 2 As shown, the permanent magnet 3 is a circular magnetic sheet, and the maximum outer diameter of the circular magnetic sheet is smaller than the radius of the roller 21. In this embodiment, when the maximum outer diameter of the circular magnetic sheet is smaller than the radius of the roller 21, the detection result of the magnetoelectric switch 4 is more accurate.

[0025] like Figure 1 and Figure 2 As shown, the model of the magnetoelectric switch 4 is CT15-G30-C1 magnetoelectric switch 4. In this embodiment, when the CT15-G30-C1 magnetoelectric switch 4 is facing the permanent magnet 3, the pulse signal input from the CT15-G30-C1 magnetoelectric switch 4 to the controller 6 is at a high level; when the CT15-G30-C1 magnetoelectric switch 4 is misaligned with the permanent magnet 3, the pulse signal input from the CT15-G30-C1 magnetoelectric switch 4 to the controller 6 is at a low level. Under normal circumstances, the frequency of the returned high level is stable. When the frequency of the high level is unbalanced, the controller 6 controls the alarm 7 to sound an alarm. In addition, the conveying speed of the coal conveyor belt can be visually observed based on the waveform diagram formed by the high and low levels. The controller 6 has a frequency-voltage converter installed on its circuit board. The frequency-voltage converter can linearly convert the input high level frequency into the corresponding analog voltage output, indirectly reflecting the speed value of the roller 21, thereby obtaining the speed of the coal conveyor belt.

[0026] The specific embodiments described herein are merely illustrative examples of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the scope defined by this utility model.

Claims

1. A novel coal conveyor belt speed measuring and alarm device, comprising a frame (1), a roller conveyor belt (2) mounted on the frame (1), wherein the roller conveyor belt (2) is provided with a plurality of rollers (21), characterized in that: A permanent magnet (3) is fixed at the end of the roller (21), a magnetoelectric switch (4) with the detection end facing the permanent magnet (3), a bracket (5) for mounting the magnetoelectric switch (4) on the frame (1), a controller (6) electrically connected to the magnetoelectric switch (4), the permanent magnet (3) and the roller (21) are offset from each other, and the controller (6) is electrically connected to an alarm (7).

2. The novel coal conveyor belt speed measuring and alarm device according to claim 1, characterized in that, The magneto-electric switch (4) is connected to the bracket (5) by an adjustment structure, which is used to adjust the distance between the detection end of the magneto-electric switch (4) and the end of the roller (21).

3. The novel coal conveyor belt speed measuring and alarm device according to claim 2, characterized in that, The adjustment structure includes a circular sleeve (81) fixedly sleeved on the magneto-electric switch (4) and a circular ring (82) welded and fixed to the top of the bracket (5). The outer side of the circular sleeve (81) is provided with an external thread (811), and the inner side of the circular ring (82) is provided with an internal thread that is screwed to the external thread (811).

4. The novel coal conveyor belt speed measuring and alarm device according to claim 1, characterized in that, The distance between the detection end of the magneto-electric switch (4) and the end of the roller (21) is 5 to 10 mm.

5. The novel coal conveyor belt speed measuring and alarm device according to claim 1, characterized in that, The bottom end of the bracket (5) is welded and fixed to the frame (1).

6. The novel coal conveyor belt speed measuring and alarm device according to claim 1, characterized in that, The permanent magnet (3) is a circular magnetic sheet, and the maximum outer diameter of the circular magnetic sheet is smaller than the radius of the roller (21).

7. The novel coal conveyor belt speed measuring and alarm device according to claim 1, characterized in that, The model of the magnetoelectric switch (4) is CT15-G30-C1 magnetoelectric switch (4).

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