Pellet rotary kiln driving device and pellet rotary kiln

Abstract

The invention discloses a pellet rotary kiln driving device and a pellet rotary kiln, and relates to the technical field of motor driving. The driving device comprises a rotor part which comprises a rotary kiln barrel, permanent magnets and a permanent magnet mounting support, the permanent magnet mounting support is arranged on the periphery of the rotary kiln barrel, a plurality of grooves are evenly formed in the circumferential direction of the permanent magnet mounting support, the permanent magnets are arranged in the grooves, and the magnetic poles of the adjacent permanent magnets are opposite; the stator part comprises a stator three-phase winding, a stator iron core and a stator fixed sealing cover, the stator iron core is arranged on the inner side of the stator fixed sealing cover, a plurality of bosses are arranged on the stator iron core, and the stator three-phase winding is wound on the bosses. According to the driving device, due to the fact that the direct connection mode is adopted, intermediate links influencing transmission efficiency such as a speed reducer and gear transmission are reduced, and therefore the driving device is higher in efficiency, low in energy consumption, obvious in energy-saving effect, compact in structure, convenient to maintain and low in maintenance cost, and fault points are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of motor drive, and in particular to a pelletizing rotary kiln driving device and a pelletizing rotary kiln. Background Art

[0002] Pelletizing rotary kiln is a heavy mechanical equipment with high energy consumption. The commonly used drive device is a three-phase asynchronous motor + reducer + open gear, or a hydraulic motor + open gear. The former has many parts, a non-compact structure, and poor starting performance. In order to meet the starting torque, it is often necessary to select a motor with a power consumption far greater than that of normal operation; the latter has high investment costs and high failure rates; both have the defects of many failure points, high maintenance costs, low transmission efficiency, and high energy consumption. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] To this end, the first aspect of the present invention provides a pelletizing rotary kiln driving device, comprising:

[0005] The rotor part includes a rotary kiln cylinder, a permanent magnet and a permanent magnet mounting bracket, wherein the permanent magnet mounting bracket is arranged on the outer periphery of the rotary kiln cylinder, and a plurality of grooves are evenly arranged on the circumference of the permanent magnet mounting bracket, wherein the permanent magnets are arranged in the grooves, and the magnetic poles of adjacent permanent magnets are opposite;

[0006] The stator part comprises a stator three-phase winding, a stator core and a stator fixed sealing cover. The stator core is arranged inside the stator fixed sealing cover. The stator core is provided with a plurality of bosses, and the stator three-phase winding is wound on the bosses.

[0007] Furthermore, the installation position of the pelletizing rotary kiln driving device is between two supports of the rotary kiln cylinder and within a range of 5m to 6m from the support of the kiln tail cylinder.

[0008] Furthermore, the rotor part and the stator part are coaxially arranged, and the radial distance between the stator core and the permanent magnet is 3 mm to 6 mm.

[0009] Furthermore, the circumferential distance between adjacent grooves is 1.2 to 1.4 times the circumferential size of the permanent magnet.

[0010] Furthermore, the number of the bosses is 1.2 to 1.5 times the number of the grooves, the circumferential size of the bosses is such that the circumferential size of the winding arrangement grooves formed between adjacent bosses is 5 mm to 15 mm, and the axial size of the bosses is the same as the axial size of the grooves.

[0011] Furthermore, the permanent magnet is connected to the groove by using screws, or the permanent magnet is connected to the groove by using an adhesive.

[0012] Furthermore, the stator fixing sealing cover is fixed by a supporting frame.

[0013] Furthermore, the pelletizing rotary kiln drive device also includes a circuit control unit, which includes a power supply, a frequency converter, an overload protection circuit and a phase loss protection circuit. The circuit control unit is used to pass three-phase alternating current into the stator three-phase winding to control the start and stop and speed of the pelletizing rotary kiln drive device, and to implement overload and phase loss protection for the pelletizing rotary kiln drive device.

[0014] Furthermore, the diameter of the rotary kiln cylinder is not less than 4m.

[0015] A second aspect of the present invention provides a pelletizing rotary kiln, comprising the above-mentioned pelletizing rotary kiln driving device.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] The rotary kiln driving device provided by the present invention comprises a rotary kiln cylinder, a permanent magnet and a permanent magnet mounting bracket to form a rotor part, a stator three-phase winding, a stator core and a stator fixed sealing cover to form a stator part, and the rotor part and the stator part form an annular permanent magnet motor. Due to the direct connection form, intermediate links such as a reducer and a gear transmission that affect the transmission efficiency are reduced, so the efficiency is higher, the energy consumption is low, the energy-saving effect is obvious, the failure points are reduced, the structure is compact, the maintenance is convenient, and the maintenance cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0019] Figure 1 A schematic diagram of the installation position of a pelletizing rotary kiln drive device provided in an embodiment of the present application.

[0020] Figure 2 A schematic diagram of a pelletizing rotary kiln driving device provided in an embodiment of the present application ( Figure 1 AA section view).

[0021] Figure 3 A partially enlarged view of a pelletizing rotary kiln driving device provided in an embodiment of the present application.

[0022] Figure 4A schematic diagram of the circuit control unit provided in an embodiment of the present application.

[0023] Among them, the correspondence between the figure marks and the component names is: 1. rotary kiln cylinder, 2. permanent magnet, 3. permanent magnet mounting bracket, 4. stator three-phase winding, 5. stator core, 6. stator fixed sealing cover, 7. support frame. DETAILED DESCRIPTION

[0024] In order to better understand the above-mentioned technical scheme, the technical scheme of the embodiments of the present application is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical scheme of the embodiments of the present application, rather than limitations on the technical scheme of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments may be combined with each other.

[0025] See also Figure 1 to Figure 4 According to a first aspect of an embodiment of the present invention, a pelletizing rotary kiln driving device is provided, comprising:

[0026] The rotor part includes a rotary kiln cylinder 1, permanent magnets 2 and a permanent magnet mounting bracket 3. The permanent magnet mounting bracket 3 is arranged on the outer periphery of the rotary kiln cylinder 1. The permanent magnet mounting bracket 3 is evenly provided with a plurality of grooves in the circumferential direction. The permanent magnets 2 are arranged in the grooves. The magnetic poles of adjacent permanent magnets 2 are opposite.

[0027] The stator part includes a stator three-phase winding 4, a stator core 5 and a stator fixed sealing cover 6. The stator core 5 is arranged on the inner side of the stator fixed sealing cover 6. The stator core 5 is provided with a plurality of bosses, and the stator three-phase winding 4 is wound on the bosses.

[0028] The pelletizing rotary kiln driving device provided by the embodiment of the present invention is essentially a ring-shaped permanent magnet motor, and therefore has the characteristics of a permanent magnet motor, namely, good debugging performance, large starting torque, high power factor and efficiency, suitable for the heavy-load and high-power characteristics of the rotary kiln, and especially suitable for use in scenarios where starting with materials and requiring a large starting torque are required. The rotor part is composed of a rotary kiln cylinder, a permanent magnet, and a permanent magnet mounting bracket, the stator part is composed of a stator three-phase winding, a stator core, and a stator fixed sealing cover, and the rotor part and the stator part constitute a ring-shaped permanent magnet motor. Due to the direct connection form, the intermediate links that affect the transmission efficiency, such as a reducer and a gear transmission, are reduced, so the efficiency is higher, the energy consumption is low, the energy-saving effect is obvious, the failure points are reduced, the structure is compact, the maintenance is convenient, and the maintenance cost is low.

[0029] In a feasible implementation manner, the installation position of the pelletizing rotary kiln driving device is between two supports of the rotary kiln cylinder and within a range of 5m to 6m from the support of the kiln tail cylinder.

[0030] Specifically, Figure 1As shown in the figure, the installation position of the pelletizing rotary kiln driving device is the installation position of the large gear ring of the original driving device, that is, between the two supports of the rotary kiln cylinder and within the range of 5m to 6m from the support of the cylinder at the kiln tail. The deformation of the cylinder at this position is small, which is conducive to ensuring the dimensional accuracy of the driving device during installation and operation.

[0031] In a feasible implementation manner, the rotor part and the stator part are coaxially arranged, and the radial distance between the stator core 5 and the permanent magnet 2 is 3 mm to 6 mm.

[0032] Specifically, the radial distance between the stator core 5 and the permanent magnet 2, that is, the air gap between the stator and the rotor, can ensure that when there is a dimensional error and deformation of the rotary kiln shell 1, the air gap between the stator and the rotor is maintained within a reasonable range, and the air gap is too large, which will lead to problems such as a reduction in the torque generated by the magnetic field on the rotor, unstable operation, increased noise, reduced efficiency, excessive temperature rise, and increased vibration. The air gap is also too small, which will not cause local friction between the stator and the rotor.

[0033] In a feasible implementation manner, the circumferential distance between adjacent grooves is 1.2 to 1.4 times the circumferential size of the permanent magnet 2 .

[0034] Specifically, the groove size should ensure that the permanent magnet 2 can be placed in the groove, and the gap should be minimized to ensure that the permanent magnet 2 is not loose. The circumferential distance between adjacent grooves is 1.2 to 1.4 times the circumferential size of the permanent magnet 2. Preferably, the circumferential distance between adjacent grooves is 1.3 times the circumferential size of the permanent magnet 2 to ensure that the rotor magnetomotive force distortion rate is low and improve the utilization rate of the permanent magnet.

[0035] In a feasible implementation, the number of bosses is 1.2 to 1.5 times the number of grooves, the circumferential size of the bosses is such that the circumferential size of the winding arrangement slots formed between adjacent bosses is 5 mm to 15 mm, and the axial size of the bosses is the same as the axial size of the grooves.

[0036] Specifically, the number of bosses is 1.2 to 1.5 times the number of grooves, and the circumferential size of the bosses should be such that the circumferential size d of the winding arrangement slot formed between adjacent bosses (e.g. Figure 3 As shown), it is 5mm to 15mm; the size design of the groove determines the spacing of the permanent magnets, and the circumferential distance between adjacent grooves is about 1.3 times the circumferential size of the permanent magnet 2; such a size setting of the grooves and bosses can make the permanent magnet utilization rate close to the maximum value.

[0037] In a feasible implementation manner, the permanent magnet 2 is connected to the groove by using screws, or the permanent magnet 2 is connected to the groove by using an adhesive.

[0038] Specifically, the permanent magnet 2 can be fixed in the groove by screw connection, adhesive, etc., preferably by screw connection, which is convenient for maintenance and replacement of the permanent magnet.

[0039] In a feasible implementation manner, the stator fixed sealing cover 6 is fixed by a support frame 7 .

[0040] It is understandable that if Figure 2 As shown, the support frame 7 fixes the fixed sealing cover 6 on the foundation, provides sufficient rigidity and strength support for the fixed sealing cover 6, and prevents the fixed sealing cover 6 from deformation or even damage.

[0041] In a feasible embodiment, the pelletizing rotary kiln drive device also includes a circuit control unit, which includes a power supply, a frequency converter (backstop), an overload protection circuit and a phase loss protection circuit. The circuit control unit is used to pass three-phase alternating current into the stator three-phase winding 4 to control the start and stop and speed of the pelletizing rotary kiln drive device, and to implement overload and phase loss protection for the pelletizing rotary kiln drive device.

[0042] Specifically, see Figure 4 As shown, the frequency converter (backstop) controls the speed and direction of the drive device by adjusting the power frequency, thereby realizing speed regulation and preventing reverse rotation; the overload protection circuit is used to prevent damage to the main power line due to overload; the phase loss protection circuit monitors each phase of the three-phase power supply. When it detects that one phase is powered off, it will automatically cut off the power supply to prevent equipment damage or safety accidents caused by phase loss.

[0043] In a feasible implementation manner, the diameter of the rotary kiln shell 1 is not less than 4 m to ensure that there is enough circumferential space for installing the permanent magnets.

[0044] A second aspect of the embodiments of the present invention provides a pelletizing rotary kiln, comprising the above-mentioned pelletizing rotary kiln driving device.

[0045] Example 1 A pelletizing rotary kiln driving device

[0046] like Figure 1 As shown, the installation position of the pelletizing rotary kiln driving device is 5m to 6m away from the rotary kiln cylinder support at the kiln tail of the rotary kiln, and the installation position of the large gear ring of the original driving device can be selected.

[0047] like Figure 2 to Figure 4 As shown, the pelletizing rotary kiln driving device provided in Example 1 mainly includes a rotary kiln cylinder 1, a permanent magnet 2, a permanent magnet mounting bracket 3, a stator three-phase winding 4, a stator core 5, a stator fixed sealing cover 6, a support frame 7 and a circuit control unit.

[0048] The permanent magnet mounting bracket 3 is fixed on the rotary kiln cylinder 1 by bolt connection. The permanent magnet 2 is evenly mounted in the groove of the permanent magnet mounting bracket 3 in the form of alternating arrangement of magnetic poles on the outer surface. The rotary kiln cylinder 1, the permanent magnet 2 and the permanent magnet mounting bracket 3 together constitute the rotor part of the driving device. The rotary kiln cylinder 1 is supported by support rollers and can therefore rotate freely.

[0049] The stator fixed sealing cover 6 is supported by a support frame 7 and fixed on the ground, the stator core 5 is fixed on the inner side of the stator fixed sealing cover 6, the stator three-phase winding 4 is composed of motor coils and is wound on the boss of the stator core 5 in a uniform and symmetrical form, and the stator three-phase winding 4, the stator core 5, and the stator fixed sealing cover 6 together constitute the stator part of the drive device.

[0050] Working principle of the pelletizing rotary kiln drive device: The rotary kiln cylinder 1, permanent magnet 2, and permanent magnet mounting bracket 3 constitute the rotor part, the stator three-phase winding 4, the stator core 5, and the stator fixed sealing cover 6 constitute the stator part, and the above stator part, rotor part and circuit control system constitute an annular permanent magnet motor. The stator three-phase winding 4 is fed with three-phase alternating current to form a periodically changing rotating magnetic field, which generates magnetic force on the permanent magnet 2 and drives the rotary kiln cylinder 1 to rotate. The circuit control part is composed of a power supply, a frequency converter, a backstop, an overload protection circuit, and a phase loss protection circuit. The start and stop and speed adjustment of the annular permanent magnet motor (drive device) are controlled by the circuit control part, and the protection of the drive device against overload, phase loss and other fault conditions is realized.

[0051] In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0053] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0054] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. 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 pelletizing rotary kiln driving device, characterized in that: include: A rotor part, the rotor part comprising a rotary kiln cylinder (1), permanent magnets (2) and a permanent magnet mounting bracket (3), the permanent magnet mounting bracket (3) being arranged on the outer periphery of the rotary kiln cylinder (1), the permanent magnet mounting bracket (3) being evenly provided with a plurality of grooves in the circumferential direction, the permanent magnets (2) being arranged in the grooves, and the magnetic poles of adjacent permanent magnets (2) being opposite; A stator part, the stator part comprising a stator three-phase winding (4), a stator iron core (5) and a stator fixed sealing cover (6), the stator iron core (5) being arranged inside the stator fixed sealing cover (6), the stator iron core (5) being provided with a plurality of bosses, and the stator three-phase winding (4) being wound on the bosses.

2. The pelletizing rotary kiln driving device according to claim 1, characterized in that: The installation position of the pelletizing rotary kiln driving device is between two supports of the rotary kiln cylinder and within a range of 5m to 6m from the support of the kiln tail cylinder.

3. The pelletizing rotary kiln driving device according to claim 1, characterized in that: The rotor part and the stator part are coaxially arranged, and the radial distance between the stator core (5) and the permanent magnet (2) is 3 mm to 6 mm.

4. The pelletizing rotary kiln driving device according to claim 1, characterized in that: The circumferential distance between adjacent grooves is 1.2 to 1.4 times the circumferential size of the permanent magnet (2).

5. The pelletizing rotary kiln driving device according to claim 4, characterized in that: The number of the bosses is 1.2 to 1.5 times the number of the grooves. The circumferential size of the bosses is such that the circumferential size of the winding arrangement grooves formed between adjacent bosses is 5 mm to 15 mm. The axial size of the bosses is the same as the axial size of the grooves.

6. The pelletizing rotary kiln driving device according to claim 1, characterized in that: The permanent magnet (2) is connected to the groove by means of screws, or the permanent magnet (2) is connected to the groove by means of an adhesive.

7. The pelletizing rotary kiln driving device according to claim 1, characterized in that: The stator fixed sealing cover (6) is fixed by a support frame (7).

8. The pelletizing rotary kiln driving device according to claim 1, characterized in that: The pelletizing rotary kiln driving device also includes a circuit control unit, which includes a power supply, a frequency converter, an overload protection circuit and a phase loss protection circuit. The circuit control unit is used to pass three-phase alternating current into the stator three-phase winding (4) to control the start and stop and speed of the pelletizing rotary kiln driving device, and to implement overload and phase loss protection for the pelletizing rotary kiln driving device.

9. The pelletizing rotary kiln driving device according to any one of claims 1 to 8, characterized in that: The diameter of the rotary kiln cylinder (1) is not less than 4m.

10. A pelletizing rotary kiln, characterized in that: It comprises the pelletizing rotary kiln driving device as described in any one of claims 1 to 9.

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