Coal belt speed protection device and speed control system of motor

Abstract

The present application belongs to the field of conveying technology, and is especially a coal conveying belt speed protection device, which comprises a carrier roller for supporting the operation of the belt, a conveying support for rotatably mounting the carrier roller, and a plurality of detectors for detecting the deviation of the belt fixedly installed on the conveying support; the detector is arranged at the enclosed space of the belt, and comprises an inclination detection part for detecting the inclination angle of the small cross section of the belt and a deviation detection part for detecting the deviation of the belt; the detection end of the inclination detection part is in contact with the return surface of the belt and rotates synchronously; 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 fixed support; the inclination detection part is located at the position close to the upstream side of the rotating direction of the belt relative to the deviation detection part; through the cooperation of the inclination detection part and the deviation detection part, the inclination angle and the deviation of the belt can be detected, and the normal operation of the belt will not be affected during detection.

Description

Technical Field

[0001] This invention belongs to the field of conveying technology, specifically relating to a coal conveyor belt speed protection device and a motor speed control system. Background Technology

[0002] Coal conveyor belt misalignment is a relatively common problem. Installation problems of the coal conveyor belt (such as the belt conveyor not being installed horizontally, the rollers not being installed accurately), wear or coal sticking to the roller surface, idler roller failure, uneven material distribution, changes in ambient temperature, and uneven belt tension can all cause coal conveyor belt misalignment.

[0003] When abnormal situations such as belt misalignment or damage to the directional roller occur, the belt is easily damaged and scratched. Such faults are not easily detected in time and cause large damage, resulting in high maintenance costs. Summary of the Invention

[0004] To address the problems mentioned in the background section, this invention provides a coal conveyor belt speed protection device and a motor speed control system, which is capable of detecting the belt's tilt angle and offset without affecting the normal operation of the belt during detection.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a coal conveyor belt speed protection device, comprising idler rollers that support the belt operation, and a transport bracket for rotating the idler rollers, wherein a plurality of detectors for detecting belt deviation are fixedly installed on the transport bracket.

[0006] The detector is installed in the enclosed space of the belt. 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 belt deviation. The detection end of the inclination detection part contacts 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. The offset detection part is fixedly connected to the transport bracket by a fixed bracket. The inclination detection part is located on the upstream side of the belt rotation direction relative to the offset detection part.

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

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

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

[0010] As a preferred embodiment of the coal conveyor belt speed protection device of the present invention, a drive gear is fixedly sleeved on the outer side of the rotating shaft located in the inner space of the housing, one end of the drive gear is meshed 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 housing.

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

[0012] A speed control system for an electric motor controls the operating speed of a belt motor by infinitely looping a program acquisition.

[0013] The data is calculated and compared in 2-second intervals, and the absolute value of the result is compared with the set value for judgment.

[0014] In a preferred embodiment of the electric motor speed control system of the present invention, when the belt starts, current data is collected after the starting current has passed.

[0015] As a preferred embodiment of the speed control system for an electric motor of the present invention, when the belt stops due to an abnormal situation, the current data is collected after calculating the belt running cycle and setting a delay time based on the belt length.

[0016] Compared with the prior art, the beneficial effects of the present invention are: by cooperating with the tilt detection unit and the offset detection unit, the tilt angle and offset of the belt can be detected. The detection will not affect the normal operation of the belt, and it will not be affected by dust like the laser sensor. When combined with the speed control system of the coal conveyor belt motor, it can prevent damage or scratches to the belt when abnormal situations such as coal conveyor belt deviation or damage to the directional roller occur. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

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

[0019] Figure 2This is a schematic diagram showing the installation location of the detector in this invention;

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

[0021] Figure 4 In this invention Figure 3 An enlarged structural diagram at point A;

[0022] Figure 5 In this invention Figure 3 A magnified structural diagram at point B;

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

[0024] Figure 7 In this invention Figure 6 A magnified structural diagram at point C;

[0025] In the picture:

[0026] 1. Transport support frame; 2. Idler roller; 3. Belt;

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

[0028] 43. Flexible support; 44. Fixed support. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] like Figures 1-7 As shown:

[0031] A coal conveyor belt 3 speed protection device includes a roller 2 that supports the operation of the belt 3, and a transport support 1 that is rotatably mounted on the roller 2. Several detectors 4 for detecting belt 3 deviation are fixedly installed on the transport support 1.

[0032] The detector 4 is set in the enclosed space of the belt 3. The detector 4 includes 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 belt deviation. 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 by an elastic bracket 43. The offset detection part 42 is fixedly connected to the transport bracket 1 by a fixed bracket 44. The inclination detection part 41 is located on the upstream side of the belt 3 in the direction of rotation, 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, and 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.

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

[0035] In an optional embodiment, the offset detection unit 42 includes 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, and the rotating shaft 4202 is rotatably connected to the inner side of the housing 4201. 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.

[0036] In an optional embodiment, a drive gear 4204 is fixedly sleeved on the outside of the rotating shaft 4202 located in the internal space of the housing 4201. One end of the drive gear 4204 is meshed with a driven gear 4205. The center position of the driven gear 4205 is fixedly connected to the outside of the main shaft of the angle sensor 4206. The angle sensor 4206 is fixedly installed on the inside of one end of the housing 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 that extends out of the outer casing 4201, and the 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, wear or coal sticking on the roller surface, failure or coal sticking on the idler roller 2, or uneven material distribution can all cause the belt 3 to tilt during operation. That is, from the cross-sectional view of the belt 3, the belt 3 tilts. When the belt 3 tilts, the force on the belt 3 becomes uneven. If this uneven force affects the continuous operation of the entire belt 3, it will cause the belt 3 to run off-track. Severe belt misalignment will increase the contact pressure between the belt 3 and the directional roller. Continued operation will lead to damage and scratches on the belt 3. Through the cooperation of the tilt detection unit 41 and the offset detection unit 42, the tilt and misalignment of the belt 3 can be understood in a timely manner, improving the efficiency of the operator's monitoring and reducing the damage rate of the belt 3.

[0039] The tilting of belt 3 can be divided into two types: normal tilting and abnormal tilting. The tilting of belt 3 within a controllable range caused by non-equipment failure is considered normal tilting. Conversely, the tilting of belt 3 caused by equipment failure or coal adhesion is considered abnormal tilting. For example, the causes of normal tilting of belt 3 include uneven material distribution. The causes of abnormal tilting of belt 3 include wear or coal adhesion on the roller surface, failure or coal adhesion on idler roller 2. Such failures cause belt 3 to tilt in a certain periodicity. For example, if there is coal adhesion on a certain idler roller 2, then belt 3 will tilt when passing through that idler roller 2.

[0040] The tilt detection unit 41 can detect the tilt data of belt 3. Based on this data, it can be analyzed whether the tilt of belt 3 is normal and whether the tilt range of belt 3 is within the controllable range. If the tilt of belt 3 exceeds the controllable range, or if the tilt does not exceed the controllable range but a device malfunction or coal adhesion occurs, the entire device needs to be inspected. This can improve the efficiency of the operator's monitoring and reduce the damage rate of belt 3. Since the detection wheel 4104 contacts the return surface of belt 3 and rotates synchronously, the rotation of belt 3 can drive the detection wheel 4104 to rotate. The pressure on the detection wheel 4104 is transmitted to the detection end of pressure sensor 4102 through the wheel bracket 4103, thereby detecting the tilt by pressure sensor 4102. The pressure applied by the belt 3 to the detection wheel 4104 can be adjusted to prevent damage to the belt 3 or the tilt detection part 41 due to excessive contact pressure between the detection wheel 4104 and the belt 3. Since two tilt detection parts 41 are installed on one detector 4, the changes in the tilt of the belt 3 can be detected more effectively. The running cycle of the belt 3 is calculated based on the length and rotation speed of the belt 3. If the same tilt detection part 41 detects a change in the tilt of the belt 3 that is related to the running cycle of the belt 3, it can be predicted that the coal conveying device has malfunctioned or that coal is stuck. The coal conveying device can then be inspected manually.

[0041] The misalignment of belt 3 is related to the tilt of belt 3. Therefore, avoiding the tilt of belt 3 can reduce the occurrence of belt misalignment to a certain extent.

[0042] When belt 3 deviates from its designated path, it can be detected by the offset detection unit 42. Assuming belt 3 runs absolutely smoothly, the position of the detection wheel 4104 relative to belt 3 is also fixed. Since the tilt detection unit 41 can rotate around the offset detection unit 42, meaning it has a fixed center of rotation, when belt 3 deviates, it will cause the tilt detection unit 41 to move along with it, thus rotating the tilt detection unit 41 around the offset detection unit 42 by a certain angle. Specifically, when belt 3 deviates, it will cause the tilt detection unit 41 to move, and the tilt detection unit will rotate... When the measuring unit 41 moves, it drives the fixed cylinder 4203 through the elastic bracket 43, which in turn drives the rotating shaft 4202 to rotate. The rotating shaft 4202 drives the driving gear 4204, which in turn drives the driven gear 4205 to rotate. The rotation of the driven gear 4205 is 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 off-track. When the data output by the angle sensor 4206 is abnormal, the coal conveying belt 3 needs to be checked in time. If necessary, the operating speed of the coal conveying belt 3 should be reduced or even stopped.

[0043] A speed control system for an electric motor controls the operating speed of a belt-driven electric motor by an infinitely looping acquisition program.

[0044] The data is calculated and compared in 2-second intervals, and the absolute value of the result is compared with the set value for judgment.

[0045] In an optional embodiment, when belt 3 starts, it avoids the starting current and then begins to collect current data.

[0046] In an optional embodiment, when the belt 3 stops due to an abnormal situation, the current data is collected after calculating the belt 3's operating cycle and setting a delay time based on the belt 3's length.

[0047] The operating speed of the motor of the coal conveyor belt 3 is controlled by an infinite loop acquisition program to avoid or reduce damage to the belt 3 caused by abnormal conditions such as belt misalignment and directional roller damage. When abnormal conditions such as belt misalignment or directional roller damage occur, the current fluctuates greatly, requiring real-time detection and calculation of the current data. When the current reaches the set value, the protection system activates, greatly improving the efficiency of operator monitoring and reducing the damage rate of the belt 3. The infinite loop acquisition program periodically collects current data, calculates the collected data, and compares the calculated value with the set value to determine whether the protection action should be taken. However, the following exceptions should be noted, for example:

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

[0049] Scenario 2: Belt 3 stops due to other abnormal conditions (such as rope pulling, coal blockage, etc.). When it is restarted, belt 3 may be full of coal. At this time, the starting current and running current will be relatively large compared with the current when starting under no-load. There will also be a change in current at the moment when the coal is depleted.

[0050] When the situation occurs, the belt conveyor starts for 2 seconds to avoid the starting current, and then begins to collect current data. The data is calculated and compared in 2-second intervals. That is, the current value of the previous second is subtracted from the current value of the next second, and the absolute value of the result is compared with the set value to determine whether there is an abnormality.

[0051] When situation two occurs, i.e., the abnormal situation causes the stop (such as rope pulling, coal blockage, etc.), when restarting, the belt 3 may be full of coal. At this time, the starting current and running current will be relatively large compared with the current when starting under no-load. There will also be a change in current at the moment when the coal is emptied. It is necessary to calculate the time for belt 3 to run one revolution based on 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 descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A coal belt (3) speed protection device, comprising a carrier roller (2) supporting the running of the belt (3), and a transport support (1) rotatably mounted to the carrier roller (2), characterized in that: The transport support (1) is fixedly provided with a plurality of detectors (4) for detecting deviation of the belt (3); The detector (4) is arranged at the enclosed space of the belt (3), and the detector (4) comprises an inclination detection part (41) for detecting the inclination angle of the small cross section of the belt (3) and a deviation detection part (42) for detecting the deviation of the belt (3); the detection end of the inclination detection part (41) is in contact with and synchronously rotates with the return surface of the belt (3); the inclination detection part (41) and the deviation detection part (42) are fixedly connected through an elastic support (43); the deviation detection part (42) is fixedly connected with the transport support (1) through a fixing support (44); and the inclination detection part (41) is located at the position close to the upstream side of the rotating direction of the belt (3) relative to the deviation detection part (42). The inclination detection part (41) comprises a pressure sensor (4102) and a detection wheel (4104) which are fixed relative to the elastic support (43); the detection end of the pressure sensor (4102) is fixedly connected with a rotating wheel support (4103); one end of the rotating wheel support (4103) is rotatably connected with the detection wheel (4104); and the detection wheel (4104) is in contact with and synchronously rotates with the return surface of the belt (3). One end of the elastic support (43) is fixedly connected with a mounting sleeve (4101); and the inner side of one end of the mounting sleeve (4101) is fixedly connected with the pressure sensor (4102). The deviation detection part (42) comprises an outer shell (4201), a rotating shaft (4202) and an angle sensor (4206) for detecting the rotating angle of the rotating shaft (4202); the outer side of the outer shell (4201) is fixedly connected with the transport support (1) through the fixing support (44); the inner side of the outer shell (4201) is rotatably connected with the rotating shaft (4202); and one end of the rotating shaft (4202) extending out of the outer shell (4201) is fixed relative to the other end of the elastic support (43).

2. The coal belt (3) speed protection device according to claim 1, characterized in that: The outer side of the rotating shaft (4202) in the inner space of the outer shell (4201) is fixedly sleeved with a driving gear (4204); one end of the driving gear (4204) is meshingly connected with a driven gear (4205); the central position of the driven gear (4205) is fixedly connected with the outer side of the main shaft of the angle sensor (4206); and the angle sensor (4206) is fixedly installed at the inner side of one end of the outer shell (4201).

3. The coal belt (3) speed protection device according to claim 2, characterized in that: One end of the rotating shaft (4202) extending out of the outer shell (4201) is fixedly connected with a fixing cylinder (4203); and the outer surface of the fixing cylinder (4203) is fixedly connected with the other end of the elastic support (43).

4. A speed control system for an electric motor comprising a coal belt (3) speed protection device according to any one of claims 1-3, characterized in that: The working speed of the belt (3) motor is controlled through an infinite loop acquisition program; The data is operated and compared every 2 seconds, the obtained value is taken as an absolute value, and then compared with a set value to make a judgment.

5. A speed control system for an electric motor as claimed in claim 4, characterised in that: When the belt (3) is started, the current data is collected after the starting current is avoided.

6. The speed control system for a motor of claim 4, wherein: When the belt (3) is stopped abnormally, the current data is collected after the belt (3) running period is set according to the length of the belt (3) and a delay time is set.

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