High-precision permanent-magnet variable-frequency direct-drive stirring device

Abstract

A high-precision permanent-magnet variable-frequency direct-drive stirring device is characterized in that a permanent-magnet motor, an upper connecting sleeve set, a lower connecting sleeve set and a stirring tank are sequentially arranged in the vertical direction, the permanent-magnet motor is installed on the upper connecting sleeve set through a fastener, and the lower end of the upper connecting sleeve set is connected with the upper end of the lower connecting sleeve set through a fastener; the lower end of the lower connecting sleeve group is connected with a stirring tank through a fastener; a rotating shaft of the permanent magnet motor is connected with a stirring shaft in the stirring tank through a coupler; the upper connecting sleeve group comprises an upper flange, an upper connecting sleeve and a lower flange which are connected into a whole, and the lower connecting sleeve group comprises an upper flange, a lower connecting sleeve and a lower flange which are connected into a whole; the upper flange of the lower connecting sleeve is provided with an upper bearing, and the lower flange of the lower connecting sleeve is provided with a lower bearing which is used for supporting the connecting part between the coupler and the stirring shaft. The maintenance cost and the maintenance workload are greatly reduced, the stirring shaft can operate more stably and reliably, and the driving power is effectively reduced.

Description

Technical Field

[0001] The utility model relates to a stirring device. Background Art

[0002] Mixers are widely used in chemical, water treatment, medicine, metallurgy, cosmetics, food and other industries. However, for industries with low terminal speed, unstable load and high sealing requirements during mixing, there are many problems with the mixers used.

[0003] The existing stirring device has many accessories, the output speed cannot be adjusted, the energy loss is large, the maintenance of the stirring drive part is cumbersome, the belt needs to be replaced according to the wear and tear, and the lubricating oil needs to be frequently checked and added, which wastes a lot of manpower and material resources.

[0004] At present, the driving device of conventional mixers is a reducer plus an ordinary motor speed regulation or the motor speed is adjusted through a pulley. The output speed of the driving device is a fixed value, and the stirring shaft speed cannot be adjusted according to the on-site conditions. Therefore, it cannot fully meet various on-site usage requirements.

[0005] In particular, the larger the motor power or the larger the reducer, the greater the maintenance cost and workload. At the same time, after the reducer and other components are matched, the transmission efficiency is significantly reduced, resulting in a high operating cost for the traditional mixing system, which is not conducive to reducing costs and increasing efficiency for enterprises. Utility Model Content

[0006] The purpose of the utility model is to provide a high-precision permanent magnet variable frequency direct-drive stirring device to significantly reduce maintenance costs and maintenance workload. In addition, it can also make the stirring shaft run more stably and reliably, and effectively reduce the driving power.

[0007] To achieve the above-mentioned purpose, the utility model provides a high-precision permanent magnet variable frequency direct-drive stirring device. Along the vertical direction, the stirring device is provided with a permanent magnet motor, an upper connecting sleeve, a lower connecting sleeve and a stirring tank in sequence from top to bottom. The permanent magnet motor is installed on the upper connecting sleeve through a fastener, and the lower end of the upper connecting sleeve is connected to the upper end of the lower connecting sleeve through a fastener, and the lower end of the lower connecting sleeve is connected to the stirring tank through a fastener. The rotating shaft of the permanent magnet motor is connected to the stirring shaft in the stirring tank through a coupling to achieve stirring of the material by the stirring shaft; the upper connecting sleeve includes an upper flange, an upper connecting sleeve and a lower flange connected in sequence, and the lower connecting sleeve includes an upper flange, a lower connecting sleeve and a lower flange connected in sequence; the upper flange of the lower connecting sleeve is provided with an upper bearing, and the lower flange of the lower connecting sleeve is provided with a lower bearing for supporting the connecting part between the coupling and the stirring shaft.

[0008] As a preferred embodiment, the connecting portion between the coupling and the stirring shaft is a connecting shaft, the upper end of which is connected to the lower end of the coupling, and the lower end of which is connected to the upper end of the stirring shaft.

[0009] As a preferred embodiment, the connection portion between the coupling and the stirring shaft is the upper end portion of the stirring shaft, that is, the stirring shaft is directly connected to the coupling.

[0010] As a preferred embodiment, the material is powder, and the surface of the stirring shaft is provided with spiral blades spirally arranged around the axis of the stirring shaft.

[0011] As a preferred embodiment, a key is used to position and transmit torque between the coupling and the output shaft of the permanent magnet motor. The coupling has an elastomer and an axial fixing part to buffer and prevent axial displacement. A positioning pin is used between the coupling and the upper end of the connecting part to prevent displacement of the connecting part.

[0012] As a preferred embodiment, the lower end of the connecting shaft is positioned and connected to the stirring shaft by a pin, and the shaft end and the hole end at the connecting part are precisely processed and assembled. After the connection, the reserved groove is welded to ensure that the connection is tight and reliable.

[0013] As a preferred embodiment, the upper end of the upper bearing of the lower connecting sleeve is equipped with an upper pressure cover and a seal for compression and sealing, and an oil cup is provided near the upper bearing for grease filling. The upper end of the lower bearing of the lower connecting sleeve is equipped with a lower pressure cover and a seal for compression and sealing, and an oil cup is provided near the lower bearing for grease filling.

[0014] As a preferred embodiment, the lower end of the upper bearing is sealed with a mechanical groove seal or a sealing member, and one end of the lower bearing is sealed with a mechanical groove seal or a sealing member.

[0015] As a preferred embodiment, the upper end surface of the upper flange of the upper connecting sleeve and the lower end surface of the lower flange of the upper connecting sleeve are machined surfaces and have tightly fitting stop surfaces; and the upper end surface of the upper flange of the lower connecting sleeve and the lower end surface of the lower flange of the lower connecting sleeve are machined surfaces and have tightly fitting stop surfaces.

[0016] As a preferred embodiment, the upper connecting sleeve and the lower connecting sleeve are symmetrically provided with observation holes on both sides.

[0017] The existing stirring devices are basically driven by ordinary motors and reducers. The speed cannot be adjusted once it is designed. In the actual stirring process, different speeds are required depending on the working conditions to achieve energy saving and consumption reduction, but traditional stirring devices cannot achieve this.

[0018] The utility model adopts a permanent magnet variable frequency direct drive motor and a controller system, which can remove the reducer and realize stepless speed regulation, thereby greatly reducing maintenance costs and maintenance workload.

[0019] Conventional stirring devices do not require high machining and installation accuracy for the stirring shaft. The stirring shaft swings a lot during rotation, which increases the required torque and energy loss. In addition, heavy loads may also cause the stirring shaft to twist, deform, and break, which is not conducive to the normal and stable operation of the equipment and increases maintenance costs.

[0020] The utility model redesigns the stirring shaft part, adds a connecting sleeve and a bearing for limiting, makes the stirring shaft run more stably and reliably, and effectively reduces the driving power.

[0021] The permanent magnet direct drive motor for driving the mixer of the utility model is used for system transformation because the permanent magnet direct drive motor system has unique advantages, which can achieve a large speed increase range, low power factor, significant energy saving effect and high reliability.

[0022] The "permanent magnet direct drive motor" is directly connected to the mixer shaft to directly drive the load. This simplifies the transmission system structure, improves efficiency, makes speed regulation simple and convenient, and reduces noise.

[0023] There is no need for a large amount of daily maintenance and overhaul, which saves a lot of manpower and material costs, reduces environmental pollution in the production process, and effectively reduces carbon emissions.

[0024] At the same time, the support structure was redesigned, and a tightly matched coupling sleeve was used for positioning, and an axial pin was used to limit the axial movement of the workpiece. The bearing was used to limit the shaft and transmit torque, and the positioning accuracy and transmission accuracy were greatly improved, which effectively improved the stability and reliability of the equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of a high-precision permanent magnet variable frequency direct-drive stirring device according to an embodiment of the utility model.

[0026] Figure 2 This is a schematic diagram of the positioning structure of the connecting sleeve of the high-precision permanent magnet variable frequency direct-drive stirring device of an embodiment of the utility model.

[0027] Reference numerals: bolt assembly 1; seal 2; upper gland 3; upper bearing 4; oil cup 5; lower gland 6; lower bearing 7; permanent magnet motor 8; key 9; coupling 10; locating pin 11; upper connecting sleeve 12; upper connecting sleeve upper flange 12-1; connecting sleeve 12-2; upper connecting sleeve lower flange 12-3; lower connecting sleeve 13; lower connecting sleeve upper flange 13-1; connecting sleeve 13-2; lower connecting sleeve lower flange 12-3; connecting shaft 14; bolt 15; pin 16; stirring shaft 17; stirring tank 18 DETAILED DESCRIPTION

[0028] Hereinafter, an embodiment of the high-precision permanent magnet variable frequency direct-drive stirring device of the present invention will be described with reference to the accompanying drawings.

[0029] The embodiments described herein are specific embodiments of the present invention, which are used to illustrate the concept of the present invention, are explanatory and exemplary, and should not be interpreted as limiting the embodiments of the present invention and the scope of the present invention. In addition to the embodiments described herein, those skilled in the art can also adopt other obvious technical solutions based on the contents disclosed in the claims and the specification of this application, including technical solutions that adopt any obvious replacement and modification of the embodiments described herein.

[0030] The drawings in this specification are schematic diagrams, which assist in explaining the concept of the present utility model and schematically show the shapes of various parts and their mutual relationships.

[0031] Figure 1 This is a schematic diagram of the overall structure of an embodiment of a high-precision permanent magnet variable frequency direct-drive stirring device of the utility model. Figure 2 This is a schematic diagram of the coupling sleeve positioning structure of an embodiment of the high-precision permanent magnet variable frequency direct-drive stirring device of the utility model.

[0032] See also Figure 1 The high-precision permanent magnet variable frequency direct-drive stirring device of the embodiment of the utility model includes: a bolt assembly 1; a seal 2; an upper pressure cover 3; an upper bearing 4; an oil cup 5; a lower pressure cover 6; a lower bearing 7; a permanent magnet motor 8; a key 9; a coupling 10; a locating pin 11; an upper connecting set 12; a lower connecting set 13; a connecting shaft 14; a bolt 15; a pin 16; a stirring shaft 17; and a stirring tank 18.

[0033] The main structure of the high-precision permanent magnet variable frequency direct drive stirring device is as follows: along the vertical direction, the permanent magnet motor 8 is installed on the upper connecting set 12 through the bolt assembly 1, the lower end of the upper connecting set 12 is connected to the lower connecting set 13, the lower connecting set 13 is connected to the stirring tank 18 through the bolt 15, and the permanent magnet motor 8 is connected to the stirring shaft 17 through such a connection structure to achieve stirring of the material by the stirring shaft 17. The above-mentioned vertical direction means that the high-precision permanent magnet variable frequency direct drive stirring device is arranged along a substantially vertical direction.

[0034] There is a coupling 10 on the output shaft of the permanent magnet motor 8, and its lower end is connected to the connecting shaft 14. A key 9 is provided in the middle of the coupling for positioning and torque transmission. An elastic body and an axial fixing part are provided in the middle of the coupling 10 to buffer and prevent axial displacement. The positioning pin 11 also prevents the connecting shaft 14 from axial displacement.

[0035] The connecting shaft 14 is tightly matched with the upper bearing 4 and the lower bearing 7 through its shaft diameter with high shaft processing precision, and can rotate stably and reliably.

[0036] The lower end of the coupling shaft 14 is positioned and connected to the stirring shaft 17 through a pin 16, and the shaft end and the hole end of the connection part are precisely processed and assembled. After the connection, the reserved groove is welded to further ensure that the connection is tight and reliable. The surface of the stirring shaft 17 has a spiral blade spirally arranged around the axis of the stirring shaft 17.

[0037] In the present invention, the coupling 12 can also be directly connected to one end of the stirring shaft 17, but it is preferred to use the connecting shaft 14 as illustrated in this embodiment as a transition connection part between the stirring shaft 17, because such a structure is easy to install and process.

[0038] In addition, in this embodiment, the stirring shaft 17 is provided with a spiral blade, which is mainly used to stir the powder. In the present utility model, the stirring shaft can also be provided with other stirring structures to stir other materials, and those skilled in the art can select according to needs.

[0039] See also Figure 2 The upper connecting sleeve assembly 12 includes an upper connecting sleeve upper flange 12-1, a connecting sleeve 12-2 and an upper connecting sleeve lower flange 12-3 which are connected in sequence as one body, and the upper and lower end surfaces thereof are processed surfaces and have a tightly fitting stop surface. Observation holes are symmetrically opened on both sides of the connecting sleeve 12-2.

[0040] The lower connecting sleeve 13 includes a lower connecting sleeve upper flange 13-1, a connecting sleeve 13-2 and a lower connecting sleeve lower flange 12-3, the upper and lower end surfaces of which are machined surfaces and have tightly fitting stop surfaces, the upper end of which is matched with the upper connecting sleeve 12, and the lower end of which is matched with the upper flange of the mixing tank 18. Observation holes are symmetrically opened on both sides of the connecting sleeve 13-2, and can be used to add grease.

[0041] An upper bearing 4 is provided on the upper part of the lower connecting set 13, and an upper gland 3 and a seal 2 are provided on the upper end of the upper bearing 4 for compression and sealing, and an oil cup 5 is provided near the bearing for grease filling.

[0042] A lower bearing 7 is provided at the lower part of the lower connecting set 13, and a lower pressure cover 6 and a seal 2 are provided at the upper end of the lower bearing 7 for compression and sealing, and an oil cup 5 is provided near the bearing for grease filling.

[0043] The utility model is provided with two upper and lower bearings, so that the stirring is stable and no swing occurs, thereby effectively ensuring the performance and durability of the stirring device.

[0044] The lower end of the upper bearing 4 can be sealed with a mechanical groove seal or a seal, and the lower end of the lower bearing 7 can be sealed with a mechanical groove seal or a seal. Among them, the mechanical groove seal is easy to install, while the seal has better sealing performance.

[0045] The utility model adopts two connecting sets mainly for installing bearings and matching parts. If there is only one connecting set, it is not convenient to assemble. If one connecting set is removed, the connection distance between the motor and the stirring shaft is shortened, but it will swing due to other reasons such as materials and high-speed rotation during stirring. When the swing is large, the stirring shaft will be twisted, broken, etc. It was found in the experimental research of the inventor that the stirring shaft may be broken due to the large swing amount. If the coaxial accuracy of the stirring shaft and the motor shaft is good, such accidents can be effectively avoided.

[0046] In addition, the material is quite uneven during the mixing process and the mixing shaft is relatively long, so it is necessary to lengthen the length of the upper bearing fixed part of the shaft and ensure its coaxiality with the motor shaft through processing and structure. If the shaft of the upper part has a swing amount, then the swing amount of the mixing shaft of the lower part will be even greater.

[0047] The above describes the implementation methods of the high-precision permanent magnet variable frequency direct-drive stirring device of the present invention, and its purpose is to explain the spirit of the present invention. Please note that those skilled in the art can modify and combine the features of the above-mentioned implementation methods without departing from the spirit of the present invention. Therefore, the present invention is not limited to the above-mentioned implementation methods. The specific features of the high-precision permanent magnet variable frequency direct-drive stirring device, such as shape, size and position, can be specifically designed based on the effects of the features disclosed above, and these designs can be implemented by those skilled in the art. Moreover, the technical features disclosed above are not limited to the combinations disclosed with other features. Those skilled in the art can also make other combinations between the technical features according to the purpose of the utility model, so as to achieve the purpose of the utility model.

Claims

1. A high-precision permanent magnet variable frequency direct drive stirring device, characterized in that: In the vertical direction, the stirring device is provided with a permanent magnet motor, an upper connecting sleeve, a lower connecting sleeve and a stirring tank in sequence from top to bottom, the permanent magnet motor is installed on the upper connecting sleeve through a fastener, the lower end of the upper connecting sleeve is connected to the upper end of the lower connecting sleeve through a fastener, the lower end of the lower connecting sleeve is connected to the stirring tank through a fastener, the rotating shaft of the permanent magnet motor is connected to the stirring shaft in the stirring tank through a coupling, so that the stirring shaft stirs the material; The upper connecting sleeve assembly includes an upper flange, an upper connecting sleeve and a lower flange which are connected in sequence as an integral whole, and the lower connecting sleeve assembly includes an upper flange, a lower connecting sleeve and a lower flange which are connected in sequence as an integral whole; An upper bearing is arranged on the upper flange of the lower connecting sleeve, and a lower bearing is arranged on the lower flange of the lower connecting sleeve for supporting the connection part between the coupling and the stirring shaft.

2. The high-precision permanent magnet variable frequency direct drive stirring device according to claim 1 is characterized in that: The connecting portion between the coupling and the stirring shaft is a coupling shaft, the upper end of which is coupled to the lower end of the coupling, and the lower end of which is coupled to the upper end of the stirring shaft.

3. The high-precision permanent magnet variable frequency direct drive stirring device according to claim 1 is characterized in that: The connection portion between the coupling and the stirring shaft is the upper end portion of the stirring shaft, that is, the stirring shaft is directly connected to the coupling.

4. The high-precision permanent magnet variable frequency direct drive stirring device according to claim 1, characterized in that: The material is powder, and the surface of the stirring shaft is provided with spiral blades spirally arranged around the axis of the stirring shaft.

5. The high-precision permanent magnet variable frequency direct drive stirring device according to claim 1, characterized in that: A key is used to position and transfer torque between the coupling and the output shaft of the permanent magnet motor. An elastomer and an axial fixing member are provided in the coupling to buffer and prevent axial displacement. A positioning pin is used between the coupling and the upper end of the connecting part to prevent displacement of the connecting part.

6. The high-precision permanent magnet variable frequency direct drive stirring device according to claim 2, characterized in that: The lower end of the connecting shaft is positioned and connected to the stirring shaft through a pin, and the shaft end and the hole end of the connecting part are precisely processed and assembled. After the connection, the reserved groove is welded to ensure that the connection is tight and reliable.

7. The high-precision permanent magnet variable frequency direct drive stirring device according to any one of claims 1 to 6, characterized in that: The upper end of the upper bearing of the lower connecting sleeve is provided with an upper gland and a seal for compression and sealing, and an oil cup is provided near the upper bearing for grease filling; The upper end of the lower bearing of the lower connecting sleeve is provided with a lower pressure cover and a sealing member for compression and sealing, and an oil cup is provided near the lower bearing for grease filling.

8. The high-precision permanent magnet variable frequency direct drive stirring device according to claim 7, characterized in that: The lower end of the upper bearing is sealed by a mechanical groove seal or a sealing member, and one end of the lower bearing is sealed by a mechanical groove seal or a sealing member.

9. The high-precision permanent magnet variable frequency direct drive stirring device according to any one of claims 1 to 6, characterized in that: The upper end surface of the upper flange of the upper connecting sleeve and the lower end surface of the lower flange of the upper connecting sleeve are machined surfaces and have tightly fitting stop surfaces; and The upper end surface of the upper flange of the lower connecting sleeve and the lower end surface of the lower flange of the lower connecting sleeve are processed surfaces and have tightly matched stop surfaces.

10. The high-precision permanent magnet variable frequency direct drive stirring device according to any one of claims 1 to 6, characterized in that: The upper connecting sleeve and the lower connecting sleeve are both symmetrically provided with observation holes on both sides.

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