Water-cooling semi-direct-drive type belt conveyor of fully-switched reluctance motor

Abstract

The utility model discloses a fully switched reluctance motor water-cooling semi-direct-drive type belt conveyor which comprises a switched reluctance semi-direct-drive type motor, a driving roller, a conveying belt, a reversing roller, a belt storage bin, a frequency converter and an explosion-proof PLC (Programmable Logic Controller), the number of the switched reluctance semi-direct-drive motors, the number of the driving rollers and the number of the frequency converters are all two. The two frequency converters are correspondingly connected with the switched reluctance semi-direct-drive motors respectively, and are connected with the explosion-proof PLC; and the two switched reluctance semi-direct-drive motors are correspondingly connected with the driving rollers respectively. According to the utility model, the load characteristic is excellent, the low-speed performance is good, the starting torque is large, the starting current is small, the switched reluctance semi-direct-drive motor and the speed reducer are of an integrated structure, the layout and the structure of a driving part are optimized, and the characteristics of high power density, large starting torque, multiple controllable parameters, good speed regulation performance and the like of the switched reluctance motor are exerted; and the space is saved, and the transmission efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a belt conveyor, in particular to a water-cooled semi-direct-drive belt conveyor of a full-switched reluctance motor. Background Art

[0002] As a mining transportation equipment that uses the friction traction between the belt and the roller to transport bulk materials, the belt conveyor has the advantages of wide application range, stable operation, large transportation volume and long distance. According to the actual transportation needs, the belt conveyor can be arranged in different lengths, ranging from hundreds of meters to several kilometers, and its application range is wide. The traditional belt conveyor with long transportation distance and large transportation volume has defects such as slow response speed of the tensioning device, unstable operation process, and inability to achieve precise control, which cannot meet the requirements.

[0003] At present, the commonly used driving modes for long-distance large-scale belt conveyors in my country's mines are CTS+reducer+asynchronous motor, frequency converter+permanent magnet motor, variable frequency permanent magnet direct drive system, and variable frequency permanent magnet semi-direct drive system. Among them, the CTS+reducer+motor drive solution has the advantage of low transformation cost, but faces problems such as non-advanced technology, high failure rate, low transmission efficiency and high energy consumption; the permanent magnet motor+frequency converter drive solution has the advantages of strong drive system operation reliability, low failure rate, and small subsequent maintenance workload, but because the permanent magnet motor and frequency converter are independent of each other, a separate space is required to place the frequency converter, and the equipment occupies a large space; the variable frequency permanent magnet motor direct drive solution has the advantages of small subsequent maintenance workload, high transmission efficiency, low energy consumption, and small space occupation; the variable frequency permanent magnet motor semi-direct drive solution has a small starting current impact, convenient and reliable speed regulation, and can realize intelligent control, but there are problems such as high peak efficiency, easy demagnetization, and expensive equipment.

[0004] For heavy-duty belt conveyors, single motor drive can no longer meet their actual use needs, and multiple motors are usually required to drive them at the same time. However, multi-motor driven belt conveyors have exposed some problems in practice. The most significant problem is that the outputs of multiple motors are not synchronized, which causes the conveyor belts to be entangled with each other, causing adverse effects on the stability of equipment operation, thereby affecting the working performance of the entire system. Summary of the invention

[0005] In view of the problems existing in the above-mentioned prior art, the utility model provides a water-cooled semi-direct-drive belt conveyor with a fully switched reluctance motor. The driving part occupies a small space and has a high transmission efficiency, and can realize switching between two working modes: single-motor light load and dual-motor heavy load.

[0006] In order to achieve the above-mentioned purpose, the technical scheme adopted by the utility model is: a fully switched reluctance motor water-cooled semi-direct drive belt conveyor, including a switched reluctance semi-direct drive motor, a driving roller, a conveyor belt, a reversing roller, a belt storage bin, a frequency converter and a flameproof PLC, the conveyor belt bypasses the reversing roller, the driving roller and the belt storage bin, and the switched reluctance semi-direct drive motor, the driving roller and the frequency converter are each provided with two; the switched reluctance semi-direct drive motor includes a flameproof motor housing, a stator winding, a rotor, a rear end cover, a cover plate, a motor shaft, a stator, a front end cover and a reducer; a tension and pressure sensor is provided on the outside of the side wall of the flameproof motor housing, a rear end cover is provided on the rear end face of the flameproof motor housing, and the front end of the flameproof motor housing is provided with a A front end cover is provided, a motor shaft is provided at the axis of the flameproof motor housing, and the front and rear ends of the motor shaft are connected to the front end cover and the rear end cover respectively through the front end bearing and the rear end bearing, the rotor is arranged on the motor shaft, and a stator is provided on the inner wall of the flameproof motor housing corresponding to the rotor position, and a stator winding is provided on the stator laminations of the stator; a reducing flange is provided on the front end face of the flameproof motor housing, the reducer is connected to the reducing flange, and the motor shaft is connected to the input shaft of the reducer; two frequency converters are respectively connected to a switch reluctance semi-direct drive motor, and the two frequency converters and two tension and pressure sensors are connected to the flameproof PLC; the two switch reluctance semi-direct drive motors are respectively connected to a driving roller through a coupling.

[0007] Furthermore, it also includes a tensioning winch, which is connected to the conveyor belt. The tensioning winch is provided with a tension sensor, and the tension sensor is connected to the flameproof PLC.

[0008] Furthermore, the flameproof motor housing is a full-layer structure, the internal space of the full-layer structure is a water cooling pipe, a temperature sensor is provided in the water cooling pipe, and the temperature sensor is connected to the flameproof PLC.

[0009] Furthermore, the rotor and the stator both have multiple magnetic poles and are fully salient pole structures, and the stator winding is a four-phase concentrated winding.

[0010] Furthermore, a lubricating oil pipe is provided on the front end cover of the reducer.

[0011] Compared with the prior art, the utility model has excellent load characteristics, good low-speed performance, large starting torque and small starting current. The switched reluctance semi-direct drive motor and the reducer are an integrated structure, which optimizes the layout and structure of the drive part, and not only gives full play to the characteristics of the switched reluctance motor such as high power density, large starting torque, many controllable parameters and good speed regulation performance, but also saves space and improves transmission efficiency; it can realize the switching of the two working modes of single motor light load and dual motor heavy load, greatly reducing the energy consumption; it can realize automatic adjustment of dynamic tension during belt operation, and the response time is fast; it has strong interference suppression and high robustness; the frequency converter, tensioning winch and switched reluctance semi-direct drive motor are all controlled by the flameproof PLC in an integrated manner, reducing the energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model;

[0013] Figure 2 This is a schematic diagram of the structure of the drive system of the utility model;

[0014] Figure 3 This is a schematic diagram of the structure of the switched reluctance semi-direct drive motor of the utility model;

[0015] 1. Switched reluctance semi-direct drive motor, 2. Drive roller, 3. Conveyor belt, 4. Reversing roller, 5. Tensioning winch, 6. Belt storage bin, 7. Frequency converter, 8. Flameproof PLC, 9. Coupling; 101. Reducer, 102. First bolt, 103. Second bolt, 104. Flameproof motor housing, 105. Water cooling pipe, 106. Stator winding, 107. Rotor, 108. Rear end cover, 109. Rear end bearing, 110. Variable diameter flange, 111. Lubricating oil pipe, 112. Motor shaft, 113. Third bolt, 114. Temperature sensor, 115. Stator, 116. Front end bearing, 117. Front end cover, 118. Tension and pressure sensor. DETAILED DESCRIPTION

[0016] The utility model will be further described below in conjunction with the accompanying drawings.

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] like Figure 1 and Figure 2 As shown, the utility model includes a switched reluctance semi-direct drive motor 1, a driving roller 2, a conveyor belt 3, a plurality of reversing rollers 4, a tensioning winch 5, a belt storage bin 6, a frequency converter 7 and a flameproof PLC 8. The conveyor belt 3 passes around the reversing roller 4, the driving roller 2, the tensioning winch 5 and the belt storage bin 6. Two switched reluctance semi-direct drive motors 1, two driving rollers 2 and two frequency converters 7 are provided, and a tension sensor is provided on the tensioning winch 5.

[0019] like Figure 3As shown, the switched reluctance semi-direct drive motor 1 adopts an integrated structure of a planetary reducer and a switched reluctance motor. The switched reluctance semi-direct drive motor 1 comprises a flameproof motor housing 104, a stator winding 106, a rotor 107, a rear end cover 108, a cover plate, a motor shaft 112, a stator 115, a front end cover 117 and a reducer 101; a tension pressure sensor 118 is arranged on the side wall of the flameproof motor housing 104, a rear end cover 108 is arranged on the rear end face of the flameproof motor housing 104, and the rear end cover 108 is connected to the flameproof motor housing 104 through a third bolt 113, a front end cover 117 is arranged inside the front end of the flameproof motor housing 104, and the front end cover 117 is connected to the flameproof motor housing 104 through a second bolt 103, a motor shaft 112 is arranged at the axis of the flameproof motor housing 104, and the front and rear ends of the motor shaft 112 are connected to the front end cover 117 and the rear end cover 108 through a front end bearing 116 and a rear end bearing 109 respectively, and the rotor 107 is arranged on the motor shaft 112, and the rotor 10 A stator 115 is provided on the inner wall of the flameproof motor casing 104 corresponding to the position 7, and a stator winding 106 is provided on the stator laminations of the stator 115, and the stator winding 106 is a four-phase concentrated winding. The rotor 107 and the stator 115 both have multiple magnetic poles and the rotor 107 and the stator 115 are all full-salient pole structures; a reducing flange 110 is provided on the front end face of the flameproof motor casing 104, and the reducing flange 110 is connected to the flameproof motor casing 104 through a first bolt 102, the reducer 101 is connected to the reducing flange 110, and the motor shaft 112 is connected to the input shaft of the reducer 101; the two frequency converters 7 are respectively connected to a switch reluctance semi-direct drive motor 1, and the two frequency converters 7, two tension and pressure sensors 118 and the tension sensor are all connected to the flameproof PLC 8; the two switch reluctance semi-direct drive motors 1 are respectively connected to a driving roller 2 through a coupling 9.

[0020] The operation of the switched reluctance semi-direct-drive motor 1 follows the "minimum reluctance" principle. The magnetic flux is closed along the path with the minimum reluctance. When the rotor 107 core moves to the minimum reluctance position, the main axis coincides with the axis of the magnetic field. When a certain pole of the stator 115 is excited, it rotates in a certain direction to coincide with the position of the stator 115 axis, and makes the inductance of a certain phase excitation winding maximum. If the relative position of the rotor 107 is taken as the starting position, the certain phase winding is energized in turn, and the rotor 107 will rotate continuously in the counterclockwise direction against the excitation sequence; conversely, if the certain phase winding is energized in turn, the rotor 107 will rotate in the clockwise direction. The direction of rotation of the switched reluctance semi-direct-drive motor 1 has nothing to do with the current direction of the phase winding, and it only depends on the order in which the phase winding is energized.

[0021] The flameproof motor housing 104 is a full-layer structure, and the internal space of the full-layer structure is a water cooling pipe 105. A temperature sensor 114 is provided in the water cooling pipe 105, and the temperature sensor 114 is connected to the flameproof PLC8. The water cooling pipe 105 is divided into multiple independent areas by multiple partitions, and the partitions between the water inlet and the water outlet are completely closed, in order to ensure that the cooling water is fully cooled around the flameproof motor housing 104; the opening and closing of the cooling system unit is detected by the temperature sensor 114. When the temperature exceeds the limit value or is lower than the limit value, the flameproof PLC8 sends an opening or closing cooling system working signal, thereby cooling the motor.

[0022] The tension and pressure sensor 118 can detect the tension and pressure of the two switched reluctance semi-direct drive motors 1, and then calculate the motor torque. When the tension and pressure sensor 118 detects that one switched reluctance semi-direct drive motor 1 is underloaded (referred to as the first switched reluctance semi-direct drive motor 1 in this section), and the overload time of the other switched reluctance semi-direct drive motor 1 (referred to as the second switched reluctance semi-direct drive motor 1 in this section) exceeds the preset value, the flameproof PLC8 will increase the output torque of the first switched reluctance semi-direct drive motor 1 through the corresponding inverter 7. In order to ensure that the two driving rollers 2 of the belt conveyor have the same speed, the flameproof PLC8 will increase the speed of the second switched reluctance semi-direct drive motor 1 by adjusting another inverter 7, and reduce the output torque of the first switched reluctance semi-direct drive motor 1, so as to balance the uneven load and asynchronous speed between the first switched reluctance semi-direct drive motor 1 and the second switched reluctance semi-direct drive motor 1, avoid the situation where one end is overloaded and the other end is underloaded, and realize the intelligent control of the belt conveyor.

[0023] The tension sensor arranged on the tension winch 5 converts the measured tension signal into a current or voltage signal and transmits it to the flameproof PLC8. After calculation, the voltage or current signal is output, and then the frequency converter of the tension winch 5 is adjusted. The frequency converter controls the driving motor of the tension winch 5. The speed of the driving motor is adjusted through the frequency converter according to the tension. The driving motor drives the tension winch 5 to rotate, thereby adjusting the tension or relaxation of the conveyor belt 3.

[0024] like Figure 2As shown, the explosion-proof PLC8 sends a start command to the inverter 7 on the left. After receiving the start command, the inverter 7 on the left controls the corresponding switched reluctance semi-direct-drive motor 1 on the left to start, thereby driving the driving roller 2 on the left to rotate. At this time, the belt conveyor starts; the tension sensor 118 arranged on the switched reluctance semi-direct-drive motor 1 on the right monitors the tension of the conveyor belt in real time, and transmits the tension value to the explosion-proof PLC8. When the tension value reaches the preset value, it can be determined that the conveyor belt has been tensioned to a certain extent, and the tension of the conveyor belt at the switched reluctance semi-direct-drive motor 1 on the left needs to be relieved. At this time, the explosion-proof PLC8 sends a start command to the inverter 7 on the right. After receiving the start command, the inverter 7 on the right controls the corresponding switched reluctance semi-direct-drive motor 1 on the right to start, thereby driving the driving roller 2 on the right to rotate. On the contrary, when the tension sensor 118 provided on the switched reluctance semi-direct drive motor 1 on the right side monitors in real time that the tension value of the conveyor belt is lower than the preset value, the explosion-proof PLC8 sends a stop command to the frequency converter 7 on the right side. After receiving the stop command, the frequency converter 7 on the right side controls the corresponding switched reluctance semi-direct drive motor 1 on the right side to stop, and then the driving roller 2 on the right side stops rotating.

[0025] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any minor modifications, equivalent substitutions and improvements made to the above embodiments based on the technical essence of the present invention should be included in the protection scope of the technical solution of the present invention.

Claims

1. A fully switched reluctance motor water-cooled semi-direct drive belt conveyor, comprising a switched reluctance semi-direct drive motor (1), a drive roller (2), a conveyor belt (3), a reversing roller (4), a belt storage bin (6), a frequency converter (7) and a flameproof PLC (8), wherein the conveyor belt (3) passes around the reversing roller (4), the drive roller (2) and the belt storage bin (6), and wherein: The switched reluctance semi-direct drive motor (1), the drive roller (2) and the frequency converter (7) are each provided with two; The switched reluctance semi-direct drive motor (1) comprises a flameproof motor housing (104), a stator winding (106), a rotor (107), a rear end cover (108), a cover plate, a motor shaft (112), a stator (115), a front end cover (117) and a reducer (101); a tension and pressure sensor (118) is provided on the outside of the side wall of the flameproof motor housing (104); a rear end cover (108) is provided on the rear end face of the flameproof motor housing (104); a front end cover (117) is provided inside the front end of the flameproof motor housing (104); a motor shaft (112) is provided at the axis of the flameproof motor housing (104); and the motor shaft (112) The front and rear ends of the flameproof motor housing (104) are connected to the front cover (117) and the rear cover (108) respectively through the front bearing (116) and the rear bearing (109); the rotor (107) is arranged on the motor shaft (112); a stator (115) is arranged on the inner wall of the flameproof motor housing (104) corresponding to the position of the rotor (107); and a stator winding (106) is arranged on the stator laminations of the stator (115); a reducing flange (110) is arranged on the front end surface of the flameproof motor housing (104); the reducer (101) is connected to the reducing flange (110); and the motor shaft (112) is connected to the input shaft of the reducer (101); The two frequency converters (7) are respectively connected to a switched reluctance semi-direct drive motor (1), and the two frequency converters (7) and the two tension and pressure sensors (118) are all connected to the flameproof PLC (8); The two switched reluctance semi-direct drive motors (1) are respectively connected to a corresponding driving roller (2) via a coupling (9).

2. A fully switched reluctance motor water-cooled semi-direct drive belt conveyor according to claim 1, characterized in that: It also includes a tensioning winch (5), the tensioning winch (5) is connected to the conveyor belt (3), a tension sensor is provided on the tensioning winch (5), and the tension sensor is connected to the flameproof PLC (8).

3. The fully switched reluctance motor water-cooled semi-direct drive belt conveyor according to claim 1, characterized in that: The flameproof motor housing (104) is a full-layer structure, the internal space of the full-layer structure is a water cooling pipe (105), a temperature sensor (114) is provided in the water cooling pipe (105), and the temperature sensor (114) is connected to the flameproof PLC (8).

4. The fully switched reluctance motor water-cooled semi-direct drive belt conveyor according to claim 1, characterized in that: The rotor (107) and the stator (115) both have multiple magnetic poles, and both the rotor (107) and the stator (115) are fully salient pole structures, and the stator winding (106) is a four-phase concentrated winding.

5. The fully switched reluctance motor water-cooled semi-direct drive belt conveyor according to claim 1, characterized in that: A lubricating oil pipe (111) is provided on the front end cover of the reducer (101).

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