Permanent magnet frequency conversion all-in-one machine integrating motor, speed reducer, frequency converter and chain tensioning brake
By integrating the motor, reducer, frequency converter and chain brake into a single permanent magnet variable frequency drive, the problem of large size and space occupation of traditional drive systems has been solved. This achieves a high degree of integration and space saving of the drive system, adapts to thin coal seam mining, and improves braking stability and temperature monitoring capabilities.
Patent Information
- Application Number
- CN202520321156.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-26
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-02-26
AI Technical Summary
Traditional scraper conveyor drive systems consist of independent components, resulting in a large overall size and height, which cannot meet the space constraints in underground mining, especially in thin coal seam mining, occupying a large space and affecting coal seam mining operations.
This permanent magnet variable frequency drive integrates the motor, reducer, frequency converter, and chain brake into one unit. It adopts an integrated cylindrical structure, the reducer is a single-stage planetary transmission, the frequency converter is arranged in a straight line, and the inner and outer fixed gear plates are connected by key blocks and keyways. It is equipped with a temperature sensing module, achieving high integration and space saving.
It achieves a 36.1%-41.4% reduction in the volume and weight of the drive system, a 50% reduction in length, adapts to thin coal seam mining, provides space for the lowering of hydraulic supports, improves braking stability and safety, and enables temperature monitoring of the motor and reducer.
Smart Images
Figure CN223843652U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mining equipment technology, specifically to a permanent magnet variable frequency integrated machine that integrates a motor, reducer, frequency converter, and chain brake. Background Technology
[0002] Traditional scraper conveyor drive systems typically consist of independently assembled components such as motors, reducers, and chain tensioners, connected and driven by connecting sleeves, friction torque limiters, and large gears. This independent structural assembly suffers from drawbacks such as large overall size, high height, and long transmission chains. Due to underground space constraints and stringent size requirements for equipment, this structural assembly sometimes fails to meet on-site layout requirements, especially in thin coal seam mining. Because of the small mining height, traditional structural assemblies occupy a significant amount of space, limiting the lowering space of the hydraulic supports above the drive system and creating difficulties for coal seam mining operations. Utility Model Content
[0003] To overcome the shortcomings of existing technologies, this utility model proposes a permanent magnet variable frequency integrated machine that integrates a motor, reducer, frequency converter, and chain brake. It highly integrates the traditionally independent motor, reducer, and frequency converter to form a permanent magnet synchronous variable frequency speed control integrated machine structure, so that the drive system is perfectly integrated in terms of size, weight, and performance, in order to adapt to the mining of thin coal seams.
[0004] The technical solution adopted in this utility model is: a permanent magnet synchronous motor integrating a motor, reducer, frequency converter, and chain brake, characterized in that it includes a motor module, a reducer module, and a frequency converter module. The motor module includes a housing I and a permanent magnet synchronous motor installed in the housing I. The reducer module includes a housing II and a reducer installed in the housing II. The frequency converter module includes a frequency converter housing and a frequency converter installed in the frequency converter housing. The housing I and housing II are cylindrical housings of the same diameter, and the housing I and housing II share a common end cover for connection, forming an integrated cylindrical housing. The reducer is a single-stage planetary transmission structure, and the output shaft of the permanent magnet synchronous motor is connected to the intermediate gear of the reducer via a spline. The frequency converter module is located on one side of the housing I and is connected to the flange of the housing I. The permanent magnet synchronous motor is electrically connected to the frequency converter. The top of the frequency converter housing is not higher than the top of the integrated cylindrical housing. A chain brake is installed at the rear end of the housing I.
[0005] As a further improvement of this utility model, the inverter housing is arranged in a straight line, and its length direction is perpendicular to the center line of the integrated cylindrical shell.
[0006] As a further improvement of this utility model, multiple temperature sensing modules are installed inside the integrated cylindrical housing. The temperature sensing modules are connected to the control box and are used for temperature sensing of the reducer bearing, reducer oil temperature, and the A, B, and C windings of the motor.
[0007] As a further improvement of this utility model, the gear of the reducer is a herringbone gear for transmission.
[0008] As a further improvement of this utility model, the chain brake includes an inner fixed gear disc and an outer fixed gear disc. Multiple key blocks are circumferentially arranged on the front end face of the inner fixed gear disc, and the same number of keyways are circumferentially arranged on the rear end face of the housing I. The inner fixed gear disc is bolted to the rear end face of the housing I, and the key blocks are embedded in the keyways. The rear end face of the inner fixed gear disc has multiple keyways circumferentially arranged, and the front end face of the outer fixed gear disc has the same number of key blocks. The outer fixed gear disc is bolted to the inner fixed gear disc, and the key blocks are embedded in the keyways.
[0009] The beneficial effects of this utility model are:
[0010] (1) This permanent magnet variable frequency integrated machine structure highly integrates the motor, reducer, frequency converter, and chain brake. The permanent magnet synchronous motor and reducer are installed in two cylindrical housings of the same diameter, and the two cylindrical housings share the same end cover for connection. This integrated cylindrical structure can greatly save installation space; the frequency converter housing is installed on one side of housing I (where the permanent magnet synchronous motor is installed), and its height is not higher than the height of the integrated cylindrical structure. On the one hand, the overall height is uniformly limited, and on the other hand, the installation direction of the linearly arranged frequency converter housing will not interfere with other equipment; this integrated machine structure is particularly suitable for the matching and mining of top coal caving and thin coal seam equipment;
[0011] (2) The inner fixed gear plate in the chain brake is connected to the rear end of the housing and the inner fixed gear plate to the outer fixed gear plate by bolts. Combined with the key block and keyway, it can effectively prevent the torque generated by the chain brake when braking the motor from the shearing damage caused by the single bolt connection, so as to increase the stability and safety of braking.
[0012] (3) Multiple temperature sensing modules are arranged inside the integrated cylindrical housing, which can effectively monitor the operation of the motor and reducer. Attached Figure Description
[0013] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0014] Figure 1 This is a three-dimensional structural schematic diagram of a permanent magnet variable frequency integrated machine that integrates a motor, reducer, frequency converter, and chain brake.
[0015] Figure 2 This is a side view of the structure of the permanent magnet variable frequency integrated machine that integrates a motor, reducer, frequency converter, and chain brake of this utility model.
[0016] Figure 3 This is a schematic diagram of the chain brake structure of this utility model;
[0017] In the diagram, 1-motor module, 11-housing I, 2-reducer module, 21-housing II, 3-inverter module, 31-inverter housing, 4-chain brake, 41-inner fixed gear plate, 410-key block, 42-outer fixed gear plate, 43-control device, 5-connecting plate. Detailed Implementation
[0018] In this embodiment, the novel permanent magnet variable frequency drive (VFD) unit, which integrates a motor, reducer, frequency converter, and chain brake, is applied to a scraper conveyor as a drive device to provide driving force. Of course, this VFD unit can also be applied to other equipment.
[0019] like Figure 1 and Figure 2 As shown, this integrated unit includes a motor module 1, a reducer module 2, and a frequency converter module 3. The motor module 1 includes a housing I11 and a permanent magnet synchronous motor installed within it. The reducer module 2 includes a housing II21 and a reducer installed within it. The frequency converter module 3 includes a frequency converter housing 31 and a frequency converter installed within it. Housings I11 and II21 are cylindrical housings of the same diameter, connected by a single end cap to form an integrated cylindrical housing. This integrated cylindrical housing combines the individual motor and reducer into a cohesive structure, significantly saving space. Specifically, the reducer is a single-stage planetary gear transmission, with the output shaft of the permanent magnet synchronous motor fixedly connected to the intermediate gear of the reducer via a spline. This single-stage planetary reduction design enables low-speed, high-torque output and allows for a very small reducer size. The gears of the reducer use herringbone teeth for transmission. Taking advantage of the high overlap, low axial load, and high load-bearing capacity of the herringbone teeth, the overall size of the planetary reducer can be minimized.
[0020] The inverter enclosure 31 is located on one side of the housing I11 and is connected to the flange of the housing I11. The motor wiring enters the inverter enclosure through the flange and is electrically connected to the inverter. The top of the inverter enclosure is no higher than the top of the integrated cylindrical housing. Specifically, the centerline of the integrated cylindrical housing is perpendicular to the extension line of the middle trough of the scraper conveyor, and the inverter module 3 is located at the angle between the centerline of the integrated cylindrical housing and the extension line of the middle trough. The inverter enclosure has a straight structure and is installed on one side of the housing I11. Its length direction is consistent with the extension direction of the middle trough, and its height is limited, which can reduce the overall installation height and ensure that the installation of the inverter enclosure 31 will not interfere with other equipment. Compared with the prior art, the overall weight and volume of this highly integrated, thin structure will be reduced by 36.1%-41.4%, and the length dimension will be reduced by about 50%. Meanwhile, by placing the frequency converter module 3 on one side of the housing I11, the overall height of the equipment is reduced. This reduced height is ideal for the mining and layout of thin coal seams, providing space for the hydraulic supports to be lowered. Of course, this structure also offers better spatial advantages for the spatial layout of medium-thick coal seams.
[0021] A temperature sensing module is installed inside the integrated cylindrical housing for sensing the temperature of the reducer bearings, the reducer oil temperature, and the A, B, and C windings of the motor. Specifically, the temperature sensing module is a PT100 temperature sensor. These temperature sensing modules are electrically connected to the control box (not shown in the figure) to monitor the temperature of the running motor and reducer.
[0022] Figure 1 In the middle, a connecting plate 5 is provided at the front end of the housing II21. The connecting plate 5 is fixedly connected to the head frame of the scraper conveyor, and the output shaft of the reducer is connected to the drive sprocket.
[0023] like Figure 3As shown, a chain brake 4 is installed on the rear end face of the housing I11. The chain brake 4 is a mechanical braking device. The chain brake 4 includes an inner fixed gear disc 41 and an outer fixed gear disc 42. Four key blocks 410 are circumferentially arranged on the front end face of the inner fixed gear disc 41, and four keyways are circumferentially arranged on the rear end face of the housing I11. The inner fixed gear disc 41 is bolted to the rear end of the over-allocation I11, and the key blocks 410 are embedded in the grooves. The rear end face of the inner fixed gear disc 41 is provided with four keyways circumferentially, and the front end face of the outer fixed gear disc 42 is provided with four key blocks. The outer fixed gear disc 42 is bolted to the inner fixed gear disc 41, and the key blocks are embedded in the keyways. The internal braking mechanism mainly involves the control system driving a brake pin to sequentially pass through the pin holes on the outer fixed gear disc 42, the movable gear disc, and the inner fixed gear disc 41. During braking, the movable gear disc is fixed to the motor shaft end, and the motor shaft is braked by the limiting cooperation between the pin and the pin hole. This internal braking mechanism is not within the scope of protection of this utility model and will not be described in detail here. Through mechanical braking, when braking the rotating motor shaft, the inner fixed gear disc 41 and the outer fixed gear disc 42 receive opposite torques. In traditional connection methods, the outer fixed gear disc 42 and the inner fixed gear disc 41, as well as the inner fixed gear disc 41 and the rear end of the housing I11, are only fixed with bolts to provide anti-torsion. This method easily applies significant shear pressure to the bolts during motor braking, sometimes leading to damage to some bolts and consequently, damage to the braking system. By setting key blocks and keyways between the outer fixed gear plate 42 and the inner fixed gear plate 41, and between the inner fixed gear plate 41 and the rear end of the housing I11, the shear resistance can be greatly enhanced, thereby increasing the stability and safety of braking.
[0024] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes that can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention are all within the protection scope of the claims of the present invention.
Claims
1. A permanent magnet variable frequency drive (VFD) integrated machine that combines a motor, reducer, frequency converter, and chain brake, characterized in that, The system includes a motor module (1), a reducer module (2), and a frequency converter module (3). The motor module (1) includes a housing I (11) and a permanent magnet synchronous motor installed inside the housing I (11). The reducer module (2) includes a housing II (21) and a reducer installed inside the housing II (21). The frequency converter module (3) includes a frequency converter housing (31) and a frequency converter installed inside the frequency converter housing (31). The housing I (11) and housing II (21) are cylindrical housings with the same diameter. I(11) and the housing II(21) share an end cover for connection, forming an integral cylindrical housing; the reducer is a single-stage planetary transmission structure, and the output shaft of the permanent magnet synchronous motor is connected to the intermediate gear of the reducer through a spline; the frequency converter module (3) is located on one side of the housing I(11) and is connected to the flange of the housing I(11), and the permanent magnet synchronous motor is electrically connected to the frequency converter; the top of the frequency converter housing (31) is not higher than the top of the integral cylindrical housing; a chain brake is installed at the rear end of the housing I(11).
2. The permanent magnet variable frequency integrated machine integrating a motor, reducer, frequency converter, and chain brake as described in claim 1, characterized in that, The inverter housing (31) is arranged in a straight line, and its length direction is perpendicular to the center line of the integrated cylindrical housing.
3. The permanent magnet variable frequency integrated machine integrating a motor, reducer, frequency converter, and chain brake as described in claim 1, characterized in that, Multiple temperature sensing modules are installed inside the integrated cylindrical housing. These temperature sensing modules are connected to the control box and are used for sensing the temperature of the reducer bearing, the reducer oil temperature, and the temperature of the motor windings A, B, and C.
4. The permanent magnet variable frequency integrated machine integrating a motor, reducer, frequency converter, and chain brake as described in claim 1, characterized in that, The gears of the reducer are driven by herringbone teeth.
5. The permanent magnet variable frequency integrated machine integrating a motor, reducer, frequency converter, and chain brake as described in claim 1, characterized in that, The chain brake (4) includes an inner fixed gear disc (41) and an outer fixed gear disc (42). The front end face of the inner fixed gear disc (41) is provided with a plurality of key blocks (410) in a circumferential manner, and the rear end face of the housing I (11) is provided with the same number of keyways in a circumferential manner. The inner fixed gear disc (41) is bolted to the rear end face of the housing I (11), and the key blocks (410) are embedded in the keyways. The rear end face of the inner fixed gear disc (41) is provided with a plurality of keyways in a circumferential manner, and the front end face of the outer fixed gear disc (42) is provided with the same number of key blocks. The outer fixed gear disc (42) is bolted to the inner fixed gear disc (41), and the key blocks are embedded in the keyways.