Coal conveying belt rate protection device and rate control system of motor

Abstract

The invention belongs to the technical field of conveying, and particularly relates to a coal conveying belt rate protection device which comprises a carrier roller for supporting belt running and a conveying support for rotationally installing the carrier roller, and a plurality of detectors for detecting belt deviation are fixedly installed on the conveying support. The detector is arranged in an enclosed space of the belt and comprises an inclination detection part for detecting the inclination angle of the small section of the belt and a deviation detection part for detecting the deviation of the belt, and the detection end of the inclination detection part is in contact with the return stroke surface of the belt and rotates synchronously with the return stroke surface of the belt; the inclination detection part and the deviation detection part are fixedly connected through an elastic support, the deviation detection part is fixedly connected with the conveying support through a fixing support, and the inclination detection part is located at the position close to the upstream side of the belt rotating direction relative to the deviation detection part. The inclination angle and the offset of the belt can be detected, and normal work of the belt cannot be affected during detection.

Description

Technical Field

[0001] The invention belongs to the technical field of conveying, and in particular relates to a coal conveying belt speed protection device and a speed control system of a motor. Background Art

[0002] Coal conveyor belt deviation is a common problem. Installation problems of coal conveyor belt (such as uneven installation of belt conveyor, inaccurate installation of roller), roller surface wear or coal sticking, roller failure, uneven material distribution, ambient temperature changes and uneven belt tension can all cause coal conveyor belt deviation.

[0003] The belt is easily damaged or scratched when abnormal situations such as deviation of the coal conveyor belt and damage to the directional roller occur. Such faults are not easy to be discovered in time and cause large wounds and high maintenance costs. Summary of the invention

[0004] To solve the problems raised in the above background technology, the present invention provides a coal conveyor belt speed protection device and a motor speed control system, which can detect the inclination angle and offset of the belt without affecting the normal operation of the belt during detection.

[0005] To achieve the above object, the present invention provides the following technical solutions: a coal conveyor belt speed protection device, comprising rollers for supporting the belt running, and a transport bracket for rotatably mounting the rollers, wherein a plurality of detectors for detecting belt deviation are fixedly mounted on the transport bracket;

[0006] The detector is arranged in the enclosed space of the belt, and the detector includes an inclination detection part for detecting the inclination angle at a small cross-section of the belt and an offset detection part for detecting the belt deviation. The detection end of the inclination detection part contacts with the return surface of the belt and rotates synchronously. The inclination detection part and the offset detection part are fixedly connected by an elastic bracket, and the offset detection part is fixedly connected to the transport bracket by a fixed bracket, wherein the inclination detection part is located at a position close to the upstream side of the belt rotation direction relative to the offset detection part.

[0007] As a preferred coal conveyor belt speed protection device of the present invention, the inclination detection part includes a pressure sensor and a detection wheel fixed relative to the elastic bracket, the detection end of the pressure sensor is fixedly connected to the rotating wheel bracket, one end of the rotating wheel bracket is rotatably connected to the detection wheel, and the detection wheel contacts the return surface of the belt and rotates synchronously.

[0008] As a preferred coal conveyor belt speed protection device of the present invention, one end of the elastic bracket is fixedly connected to a mounting sleeve, and the inner side of one end of the mounting sleeve is fixedly connected to a pressure sensor.

[0009] As a preferred coal conveyor belt speed protection device of the present invention, the offset detection unit includes a shell, a rotating shaft and an angle sensor for detecting the rotation angle of the rotating shaft. The outer side of the shell is fixedly connected to the transport bracket through a fixed bracket, and the inner side of the shell is rotatably connected to the rotating shaft. The outer side of one end of the rotating shaft extending out of the shell is fixed relative to the other end of the elastic bracket.

[0010] As a preferred coal conveyor belt speed protection device of the present invention, a driving gear is fixedly mounted on the outer side of the rotating shaft located in the internal space of the shell, one end of the driving gear is meshingly connected with a driven gear, the center position of the driven gear is fixedly connected to the outer side of the main shaft of the angle sensor, and the angle sensor is fixedly installed on the inner side of one end of the shell.

[0011] As a preferred coal conveyor belt speed protection device of the present invention, a fixing cylinder is fixedly connected to the outer side of one end of the rotating shaft extending out of the shell, and the outer surface of the fixing cylinder is fixedly connected to the other end of the elastic bracket.

[0012] A motor speed control system controls the working speed of the belt motor through an infinite loop acquisition program;

[0013] The data is compared and calculated in a 2-second cycle, and the absolute value obtained is compared with the set value for judgment.

[0014] As a preferred speed control system of an electric motor of the present invention, when the belt is started, after avoiding the starting current, the current data begins to be collected.

[0015] As a preferred speed control system of an electric motor of the present invention, when the belt stops due to an abnormal situation, the current data is collected after the delay time is set by calculating the belt operation cycle according to the length of the belt.

[0016] Compared with the prior art, the beneficial effects of the present invention are: through the cooperation of the inclination detection part and the offset detection part, the inclination angle and offset of the belt can be detected, and the normal operation of the belt will not be affected during the detection. In addition, it will not be easily affected by dust like a laser sensor. In conjunction with the speed control system of the coal conveyor belt motor, the belt can be prevented from being damaged or scratched when abnormal situations such as deviation of the coal conveyor belt and damage to the directional roller occur. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2It is a schematic diagram of the installation position of the detector in the present invention;

[0020] Figure 3 It is a schematic diagram of the overall structure of the detector in the present invention;

[0021] Figure 4 For the present invention Figure 3 Schematic diagram of the enlarged structure at A;

[0022] Figure 5 For the present invention Figure 3 Schematic diagram of the enlarged structure at B;

[0023] Figure 6 is a cross-sectional view of the internal structure of the offset detection unit in the present invention;

[0024] Figure 7 For the present invention Figure 6 Schematic diagram of the enlarged structure at C;

[0025] In the figure:

[0026] 1. Transport bracket; 2. Roller; 3. Belt;

[0027] 4. Detector; 41. Tilt detection unit; 4101. Mounting sleeve; 4102. Pressure sensor; 4103. Rotating wheel bracket; 4104. Detection wheel; 42. Deflection detection unit; 4201. Housing; 4202. Rotating shaft; 4203. Fixed cylinder; 4204. Driving gear; 4205. Driven gear; 4206. Angle sensor;

[0028] 43. Elastic bracket; 44. Fixed bracket. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] like Figure 1-Figure 7 As shown:

[0031] A speed protection device for a coal conveying belt 3, comprising a roller 2 for supporting the running of the belt 3, and a transport bracket 1 for rotatably mounting the roller 2, wherein a plurality of detectors 4 for detecting deviation of the belt 3 are fixedly mounted on the transport bracket 1;

[0032] The detector 4 is arranged in the enclosed space of the belt 3. The detector 4 includes a tilt detection part 41 for detecting the tilt angle of the small cross-section of the belt 3 and an offset detection part 42 for detecting the deviation of the belt 3. The detection end of the tilt detection part 41 contacts the return surface of the belt 3 and rotates synchronously. The tilt detection part 41 and the offset detection part 42 are fixedly connected by an elastic bracket 43. The offset detection part 42 is fixedly connected to the transport bracket 1 by a fixed bracket 44, wherein the tilt detection part 41 is located at a position close to the upstream side of the rotation direction of the belt 3 relative to the offset detection part 42.

[0033] In an optional embodiment, the tilt detection unit 41 includes a pressure sensor 4102 and a detection wheel 4104 fixed relative to the elastic bracket 43, the detection end of the pressure sensor 4102 is fixedly connected to the rotating wheel bracket 4103, one end of the rotating wheel bracket 4103 is rotatably connected to the detection wheel 4104, and the detection wheel 4104 contacts the return surface of the belt 3 and rotates synchronously.

[0034] In an optional embodiment, one end of the elastic bracket 43 is fixedly connected to a mounting sleeve 4101 , and the inner side of one end of the mounting sleeve 4101 is fixedly connected to a pressure sensor 4102 .

[0035] In an optional embodiment, the offset detection unit 42 includes a shell 4201, a rotating shaft 4202 and an angle sensor 4206 for detecting the rotation angle of the rotating shaft 4202. The outer side of the shell 4201 is fixedly connected to the transport bracket 1 through a fixed bracket 44. The inner side of the shell 4201 is rotatably connected to the rotating shaft 4202. The outer side of one end of the rotating shaft 4202 extending out of the shell 4201 is fixed relative to the other end of the elastic bracket 43.

[0036] In an optional embodiment, a driving gear 4204 is fixedly sleeved on the outer side of a rotating shaft 4202 located in the internal space of the outer shell 4201, one end of the driving gear 4204 is meshedly connected with a driven gear 4205, and the center position of the driven gear 4205 is fixedly connected to the outer side of the main shaft of an angle sensor 4206, and the angle sensor 4206 is fixedly installed on the inner side of one end of the outer shell 4201.

[0037] In an optional embodiment, a fixing cylinder 4203 is fixedly connected to the outer side of one end of the rotating shaft 4202 extending out of the housing 4201 , and an outer surface of the fixing cylinder 4203 is fixedly connected to the other end of the elastic bracket 43 .

[0038] In this embodiment: for example, when the drum surface is worn or sticky, the idler 2 fails or sticks to coal, or the material distribution is uneven, the belt 3 will be tilted during operation, that is, from the cross-sectional perspective of the belt 3, the belt 3 is tilted. When the belt 3 is tilted, the force on the belt 3 will be uneven. If this uneven force affects the continuous operation of the entire belt 3, the belt 3 will be deviated. Severe deviation of the belt 3 will increase the contact pressure between the belt 3 and the directional roller. Continuing to run will cause damage to the belt 3. The inclination and deviation of the belt 3 can be timely understood through the cooperation of the inclination detection unit 41 and the deviation detection unit 42, so as to improve the efficiency of the operator's monitoring and reduce the damage rate of the belt 3.

[0039] The inclination of the belt 3 can be classified into two situations: normal inclination and abnormal inclination. The inclination of the belt 3 within a controllable range caused by non-device failure is normal inclination. On the contrary, the inclination of the belt 3 caused by device failure or coal sticking is abnormal inclination. For example, the reasons for the normal inclination of the belt 3 include uneven material distribution causing the belt 3 to incline. The reasons for the abnormal inclination of the belt 3 include roller surface wear or coal sticking, roller 2 failure or coal sticking. The inclination of the belt 3 caused by such failures has a certain periodicity. For example, if there is coal sticking on a roller 2, the belt 3 will incline when passing through the roller 2.

[0040] The inclination data of the belt 3 can be detected by the inclination detection unit 41. Based on the data, it can be analyzed whether the inclination of the belt 3 is normal and whether the inclination range of the belt 3 is within the controllable range. If the inclination of the belt 3 exceeds the controllable range, or the inclination does not exceed the controllable range, but a device failure or coal sticking occurs, the entire device needs to be inspected, which can improve the efficiency of the operator's monitoring and reduce the damage rate of the belt 3. Since the detection wheel 4104 is in contact with the return surface of the belt 3 and rotates synchronously, the belt 3 can drive the detection wheel 4104 to rotate when it rotates. The pressure on the detection wheel 4104 will be transmitted to the detection end of the pressure sensor 4102 through the rotating wheel bracket 4103, thereby detecting the pressure sensor 4102. The pressure exerted by the belt 3 on the detection wheel 4104, if the inclination angle of the belt 3 is too large, the deformation of the elastic bracket 43 can enable the detection wheel 4104 to follow the movement of the inclined part of the belt 3, so as to avoid excessive contact pressure between the detection wheel 4104 and the belt 3, which may cause damage to the belt 3 or the inclination detection part 41. Since two inclination detection parts 41 are installed on one detector 4, the change of the inclination of the belt 3 can be better detected; the operation cycle of the belt 3 is calculated according to the length and rotation speed of the belt 3. If the same inclination detection part 41 detects that the change of the inclination of the belt 3 is related to the operation cycle of the belt 3, then it can be estimated that the coal conveying device has a fault or coal sticking, and the coal conveying device can be checked manually;

[0041] The deviation of the belt 3 is related to the inclination of the belt 3 to a certain extent, so avoiding the inclination of the belt 3 can reduce the occurrence of the deviation of the belt 3 to a certain extent;

[0042] When the belt 3 deviates, the deviation detection unit 42 can be used for detection. Assuming that the belt 3 runs absolutely smoothly, the position of the detection wheel 4104 relative to the belt 3 is also fixed. Since the tilt detection unit 41 can rotate around the deviation detection unit 42, that is, the tilt detection unit 41 has a fixed rotation center, when the belt 3 deviates, the belt 3 will drive the tilt detection unit 41 to move together, so that the tilt detection unit 41 rotates around the deviation detection unit 42 by a certain angle. Specifically, when the belt 3 deviates, it will drive the tilt detection unit 41 to move, and the tilt detection unit 41 will rotate around the deviation detection unit 42 by a certain angle. When the measuring part 41 moves, it will drive the fixed cylinder 4203 through the elastic bracket 43 to drive the rotating shaft 4202 to rotate, and the rotating shaft 4202 will drive the driving gear 4204 to drive the driven gear 4205 to rotate. The rotation of the driven gear 4205 will be detected by the angle sensor 4206. The rotation data output by the angle sensor 4206 can be used as a basis for judging whether the belt 3 is deviated. When the data output by the angle sensor 4206 is abnormal, the coal conveyor belt 3 needs to be checked in time, and the operation speed of the coal conveyor belt 3 can be reduced or even stopped if necessary.

[0043] A motor speed control system controls the working speed of the belt 3 motor through an infinite loop acquisition program;

[0044] The data is compared and calculated in a 2-second cycle, and the absolute value obtained is compared with the set value for judgment.

[0045] In an optional embodiment, when the belt 3 is started, after avoiding the starting current, the current data begins to be collected.

[0046] In an optional embodiment, when the belt 3 stops due to an abnormal situation, the current data is collected after the delay time of the belt 3 operation cycle is calculated according to the length of the belt 3.

[0047] The working speed of the motor of the coal conveyor belt 3 is controlled by an infinite loop acquisition program to avoid or reduce the damage and scratching of the belt 3 when abnormal conditions such as deviation of the belt 3 and damage to the directional roller occur. When abnormal conditions such as deviation of the belt 3 and damage to the directional roller occur, the current fluctuates greatly, and the current data needs to be detected and calculated in real time. When the set value is reached, the protection action is taken, which greatly improves the efficiency of the operator's monitoring and reduces the damage rate of the belt 3. The current data is periodically collected by the infinite loop acquisition program, and the collected data is calculated and the calculated value is compared with the set value to determine whether the protection action is taken. However, the following exceptions need to be noted, for example:

[0048] Case 1: When belt 3 is started, the current will fluctuate greatly. It is necessary to set a reasonable delay to avoid the influence of the starting current on the protection so that the protection will not malfunction due to the starting current.

[0049] Case 2: Belt 3 stops due to other abnormal conditions (such as pulling rope, coal blocking, etc.). When it is started again, belt 3 may be full of coal. The starting current and running current at this time are relatively larger than the current when starting without load, and the current will also change at the moment when the coal is emptied;

[0050] When the situation occurs, belt 3 starts to avoid the starting current for 2 seconds, and then starts to collect current data. The data is compared with a period of 2 seconds, that is, the current value of the previous second is subtracted from the current value of the next second, and the absolute value is taken and compared with the set value to determine whether there is an abnormality.

[0051] When the second situation occurs, that is, the machine stops due to an abnormal situation (such as pulling the rope, coal blockage, etc.), when it is started again, the belt 3 may be filled with coal. The starting current and the running current at this time are relatively larger than the current at no-load start, and the current will also change at the moment when the coal is emptied. It is necessary to calculate the time it takes for the belt 3 to rotate one circle according to the length of each belt 3, and then set a reasonable delay based on this time.

[0052] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A speed protection device for a coal conveyor belt (3), comprising a roller (2) for supporting the operation of the belt (3), and a transport bracket (1) for rotatably mounting the roller (2), characterized in that: A plurality of detectors (4) for detecting deviation of the belt (3) are fixedly mounted on the transport bracket (1); The detector (4) is arranged in the enclosed space of the belt (3), and comprises an inclination detection part (41) for detecting the inclination angle at a small cross section of the belt (3) and an offset detection part (42) for detecting the deviation of the belt (3). The detection end of the inclination detection part (41) contacts the return surface of the belt (3) and rotates synchronously. The inclination detection part (41) and the offset detection part (42) are fixedly connected via an elastic bracket (43), and the offset detection part (42) is fixedly connected to the transport bracket (1) via a fixed bracket (44), wherein the inclination detection part (41) is located at a position close to the upstream side of the belt (3) in the rotation direction relative to the offset detection part (42).

2. The coal conveyor belt (3) speed protection device according to claim 1, characterized in that: The tilt detection part (41) comprises a pressure sensor (4102) and a detection wheel (4104) fixed relative to the elastic bracket (43); the detection end of the pressure sensor (4102) is fixedly connected to the rotating wheel bracket (4103); one end of the rotating wheel bracket (4103) is rotatably connected to the detection wheel (4104); the detection wheel (4104) contacts the return surface of the belt (3) and rotates synchronously.

3. The speed protection device for the coal conveyor belt (3) according to claim 2 is characterized in that: One end of the elastic bracket (43) is fixedly connected to a mounting sleeve (4101), and the inner side of one end of the mounting sleeve (4101) is fixedly connected to a pressure sensor (4102).

4. The coal conveyor belt (3) speed protection device according to claim 1, characterized in that: The offset detection unit (42) comprises a housing (4201), a rotating shaft (4202) and an angle sensor (4206) for detecting the rotation angle of the rotating shaft (4202); the outer side of the housing (4201) is fixedly connected to the transport bracket (1) via a fixed bracket (44); the inner side of the housing (4201) is rotatably connected to the rotating shaft (4202); the outer side of one end of the rotating shaft (4202) extending out of the housing (4201) is fixed relative to the other end of the elastic bracket (43).

5. The speed protection device for the coal conveyor belt (3) according to claim 4 is characterized in that: A driving gear (4204) is sleeved and fixed on the outer side of the rotating shaft (4202) located in the internal space of the housing (4201), one end of the driving gear (4204) is meshedly connected with a driven gear (4205), and the center position of the driven gear (4205) is fixedly connected to the outer side of the main shaft of the angle sensor (4206), and the angle sensor (4206) is fixedly installed on the inner side of one end of the housing (4201).

6. The coal conveyor belt (3) speed protection device according to claim 5, characterized in that: A fixing cylinder (4203) is fixedly connected to the outer side of one end of the rotating shaft (4202) extending out of the housing (4201), and the outer surface of the fixing cylinder (4203) is fixedly connected to the other end of the elastic bracket (43).

7. A speed control system for an electric motor, comprising a speed protection device for a coal conveyor belt (3) according to any one of claims 1 to 6, characterized in that: Controlling the working speed of the belt (3) motor through an infinite loop acquisition program; The data is compared and calculated in a 2-second cycle, and the absolute value obtained is compared with the set value for judgment.

8. The speed control system of the motor according to claim 7, characterized in that: When the belt (3) starts, after avoiding the starting current, the current data begins to be collected.

9. The speed control system of the motor according to claim 7, characterized in that: When the belt (3) stops due to an abnormal situation, the operation cycle of the belt (3) is calculated according to the length of the belt (3), and a delay time is set, and then the current data is collected.

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