Permanent magnet integrated driving device for cutting part of coal mining machine

Abstract

The utility model discloses a coal mining machine cutting part permanent magnet integrated driving device, which comprises a cooling water jacket, a permanent magnet motor, a planetary reduction gear and an isolation cooling end cover, and is characterized in that the cooling water jacket and a coal mining machine cutting part shell are in clearance fit installation through key connection; the permanent magnet motor stator is in interference fit with the interior of the cooling water jacket, bearings are arranged at the two ends of the permanent magnet motor rotor, and the cooling water jacket and the permanent magnet motor are arranged in a shell of the cutting part of the coal mining machine; the planetary reduction gear is arranged on one side of the permanent magnet motor, an external spline matched with an internal spline of a rotor of the permanent magnet motor is arranged on a primary sun gear of the planetary reduction gear, and the planetary reduction gear and the permanent magnet motor are in transmission connection through the external spline and the internal spline of the permanent magnet motor; the isolation cooling end cover is arranged between the permanent magnet motor and the planetary reduction gear, and the isolation cooling end cover is detachably connected with the stator end of the permanent magnet motor. The size of the permanent magnet motor can be reduced, interference is avoided, disassembly and assembly are convenient, and high temperature in the permanent magnet motor can be isolated.

Description

Technical Field

[0001] This utility model relates to the field of coal mining machine technology, and in particular to a permanent magnet integrated drive device for the cutting section of a coal mining machine. Background Technology

[0002] Coal mining machines are among the most widely used underground mining equipment in coal mines both domestically and internationally. Currently, the cutting sections of coal mining machines used both domestically and internationally primarily employ asynchronous motors driving spur gears and planetary transmission gearboxes to drive the cutting drum, achieving coal cutting and loading. Because the power transmission of existing cutting sections requires multiple sets of idler gears, power loss occurs; deformation of the cutting section during operation leads to reduced transmission efficiency between gears, increased heat generation, and reduced bearing and seal life. Furthermore, when the cutting section is matched with drums of different diameters, the lack of speed regulation functionality results in reduced coal loading and cutting efficiency. Figure 1 The diagram shows the transmission structure of the cutting section of a traditional coal mining machine.

[0003] The market application of permanent magnet motors in the cutting section of coal mining machines is currently limited, mainly due to the low maturity of the technology and the space constraints and harsh working conditions of the cutting section. Therefore, there are no successful application cases. To address the aforementioned problems in the application of permanent magnet motors in the cutting section of coal mining machines, prior art with patent number CN102877841B discloses a drum-type rocker arm for a coal mining machine, such as... Figure 2 As shown, its characteristic is that a permanent magnet motor and a reducer are arranged at the head of the rocker arm housing, and the permanent magnet motor drives a single-stage planetary reducer to realize the operation of the cutting section. This existing invention patent is one of the earliest applications in China to drive the cutting section roller with a permanent magnet motor through a single-stage planetary reducer. However, this invention patent still has the following problems in practical application:

[0004] (1) The invention adopts a drive method of permanent magnet motor + first-stage planetary reduction. Due to the limitation of axial dimension, the outer diameter of permanent magnet motor needs to be made large. In the actual operation of coal mining machine, the excessively large outer diameter of permanent magnet motor will cause interference with the scraper conveyor shovel and hydraulic support top beam used with it.

[0005] (2) The working temperature inside the permanent magnet motor cavity can reach over 80℃. For the adjacent reducer, this will cause irreversible damage to the reducer bearings, gears and seals, seriously affecting the service life of the reducer.

[0006] (3) The permanent magnet motor stator is directly installed in the rocker arm housing. Due to the interference fit, it is difficult to disassemble and repair directly after a failure. The entire rocker arm needs to be replaced, which is more costly. Utility Model Content

[0007] To address some or all of the technical problems existing in the prior art, this utility model provides a permanent magnet integrated drive device for the cutting section of a coal mining machine. This device can reduce the size of the permanent magnet motor, meet the requirements of actual underground use, avoid interference, and facilitate disassembly and assembly. It can also cool the reducer while isolating the high temperature inside the permanent magnet motor, thus ensuring the operating efficiency of the coal mining machine.

[0008] The technical solution of this utility model is as follows:

[0009] This utility model discloses a permanent magnet integrated drive device for the cutting section of a coal mining machine, comprising:

[0010] A cooling water jacket is installed with a keyed connection to the shell of the coal mining machine's cutting section, allowing for clearance fit.

[0011] The permanent magnet motor has its stator interference-fitted into the interior of the cooling water jacket, and its rotor is provided with bearings at both ends. The cooling water jacket and the permanent magnet motor are located inside the housing of the coal mining machine's cutting section.

[0012] A planetary reduction gear is disposed on one side of the permanent magnet motor. An external spline matching the internal spline of the permanent magnet motor rotor is provided on the first-stage sun gear of the planetary reduction gear, and the two are connected by the external spline and the internal spline of the permanent magnet motor.

[0013] An isolation cooling end cover is disposed between the permanent magnet motor and the planetary reduction gear, and the isolation cooling end cover is detachably connected to the stator end of the permanent magnet motor.

[0014] Furthermore, in the aforementioned permanent magnet integrated drive device for the cutting section of a coal mining machine, the cooling water jacket is a hollow structure.

[0015] Furthermore, in the aforementioned permanent magnet integrated drive device for the cutting section of a coal mining machine, the key includes a flat key.

[0016] Furthermore, in the aforementioned permanent magnet integrated drive device for the cutting section of a coal mining machine, the planetary reduction gear is configured as a two-stage device.

[0017] Furthermore, in the aforementioned permanent magnet integrated drive device for the cutting section of a coal mining machine, the isolation cooling end cover is configured as a multi-layer water channel structure.

[0018] Furthermore, in the aforementioned permanent magnet integrated drive device for the cutting section of a coal mining machine, the multi-layer waterway structure is configured as a serpentine rotary structure.

[0019] The main advantages of this utility model's technical solution are as follows:

[0020] This utility model discloses a permanent magnet integrated drive device for the cutting section of a coal mining machine. By connecting a permanent magnet motor with a planetary gear reducer, the planetary gear reducer can reduce the output torque of the permanent magnet motor, thereby reducing the size of the permanent magnet motor and meeting the requirements of actual underground use. The permanent magnet motor stator is installed in the cooling water channel with an interference fit, and the cooling water channel is installed with the cutting section housing with a clearance fit, achieving a detachable function. By setting an isolation cooling end cover between the permanent magnet motor and the planetary gear reducer, the high temperature inside the permanent magnet motor is isolated while cooling the reducer, preventing it from being transferred to the reducer and ensuring the operating efficiency of the coal mining machine. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0022] Figure 1 This is a schematic diagram of the transmission structure of the cutting section in a traditional coal mining machine in the prior art;

[0023] Figure 2 This is a schematic diagram of the rocker arm of a drum-type coal mining machine in the prior art;

[0024] Figure 3 A schematic diagram of the structure of a permanent magnet integrated drive device for the cutting section of a coal mining machine, provided in an embodiment of this utility model;

[0025] Figure 4 This is a schematic diagram of the first structure of the cooling water cooling path in a permanent magnet integrated drive device for the cutting section of a coal mining machine, provided in an embodiment of the present invention.

[0026] Figure 5 This is a second structural schematic diagram of the cooling water cooling path in a permanent magnet integrated drive device for the cutting section of a coal mining machine, provided as an embodiment of the present invention.

[0027] Figure 6 This is a third structural schematic diagram of the cooling water cooling path in a permanent magnet integrated drive device for the cutting section of a coal mining machine, provided as an embodiment of the present invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Coal mining machine cutting section housing; 2. Permanent magnet motor rotor; 3. Permanent magnet motor stator; 4. Cooling water jacket; 5. Key; 6. Isolation cooling end cover; 7. Planetary reducer; 8. Reducer cooling water inlet pipe; 9. End cover water inlet pipe; 10. Isolation cooling cover plate water outlet and permanent magnet motor cooling water jacket water inlet pipe; 11. End cover circulating water channel;

[0030] 41. Cooling water jacket inlet pipe; 42. Cooling water jacket outlet pipe;

[0031] 61. Inlet pipe for isolation cooling end cover; 62. Outlet pipe for isolation cooling end cover. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0033] The technical solutions provided by the embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0034] As attached Figure 3 As shown, this utility model embodiment provides a permanent magnet integrated drive device for the cutting section of a coal mining machine. The device includes: a cooling water jacket 4, a permanent magnet motor, a planetary reduction gear 7, and an isolation cooling end cover 6, wherein:

[0035] The cooling water jacket 4 is connected to the coal cutting section housing 1 of the coal mining machine by a key 5 for clearance fit installation; the permanent magnet motor stator 3 is interference-fitted inside the cooling water jacket 4, and the permanent magnet motor rotor 2 is provided with bearings at both ends. The cooling water jacket 4 and the permanent magnet motor are located inside the housing of the coal cutting section of the coal mining machine; the planetary reduction gear 7 is located on one side of the permanent magnet motor, and an external spline matching the internal spline of the permanent magnet motor rotor 2 is provided on the first-stage sun gear of the planetary reduction gear 7, and the two are connected by transmission through the external spline and the internal spline of the permanent magnet motor; the isolation cooling end cover 6 is located between the permanent magnet motor and the planetary reduction gear 7, and the isolation cooling end cover 6 is detachably connected to the end of the permanent magnet motor stator 3.

[0036] Therefore, this utility model discloses a permanent magnet integrated drive device for the cutting section of a coal mining machine. The permanent magnet motor stator 3 is interference-fitted into the motor cooling water jacket 4, and both are installed together within the coal mining machine cutting section housing 1. Positioning and torque transmission are achieved through a key 5 connection. The permanent magnet motor rotor 2 is installed within the coal mining machine cutting section housing 1 via bearings at both ends. The internal spline of the permanent magnet motor rotor 2 is connected to the external spline of the first-stage sun gear of the planetary gear set, transmitting power from the motor to the two-stage planetary reduction gear 7, driving the output flange and realizing the operation of the cutting section. The motor cooling water jacket 4 is installed with a clearance fit to the coal mining machine cutting section housing 1, and positioning and torque transmission are achieved through a positioning key, facilitating the installation and replacement of the permanent magnet motor stator 3 and the motor cooling water jacket 4. By setting an isolation cooling end cover 6 between the permanent magnet motor and the two-stage planetary reduction gear 7, thermal isolation is achieved between the permanent magnet motor and the reduction gear while cooling the two-stage planetary reduction gear 7, preventing the high-temperature environment inside the permanent magnet motor cavity from affecting the service life of the reduction gear.

[0037] Specifically, in a permanent magnet integrated drive device for the cutting section of a coal mining machine according to this utility model, the cooling water jacket 4 is a hollow structure.

[0038] With this configuration, the cooling water jacket 4 is set as a hollow structure, preferably a circular ring structure. The inner diameter of the ring is consistent with the outer diameter of the permanent magnet motor stator 3, so that the two can be interference-fitted to achieve a cooling effect.

[0039] Specifically, in a permanent magnet integrated drive device for the cutting section of a coal mining machine according to this utility model, key 5 includes a flat key.

[0040] Therefore, by setting key 5 as a flat key structure, on the one hand, the structure is simple and easy to process, and it is safe and reliable in use with stable transmission efficiency. On the other hand, it is easy to install and disassemble, and can play the role of positioning and transmitting torque at the same time.

[0041] In some optional implementations of this embodiment, the key 5 used for positioning and transmitting torque can also be set as a semi-circular key, wedge key, tangential key, spline, etc.

[0042] Specifically, in a permanent magnet integrated drive device for the cutting section of a coal mining machine according to this utility model, the planetary reduction gear 7 is configured as a two-stage device.

[0043] This design integrates a permanent magnet motor with a two-stage planetary reduction gear 7. The two-stage planetary reduction gear 7 reduces the output torque of the permanent magnet motor, thereby reducing the size of the permanent magnet motor and meeting the actual requirements for downhole use.

[0044] Specifically, in a permanent magnet integrated drive device for the cutting section of a coal mining machine according to this utility model, the isolation cooling end cover 6 is configured as a multi-layer water channel structure.

[0045] This design, by setting the isolation cooling end cap 6 as a multi-layer water channel structure, can ensure the cooling effect through water circulation between the multi-layer water channels. The structure is simple and the cooling effect is good.

[0046] Specifically, in order to improve the cooling effect of the permanent magnet motor, the reduction gear, the cooling water jacket 4, and the isolation cooling cover plate 6, the cooling water channels in the motor cooling water jacket 4 and the isolation cooling cover plate 6 are designed as a serpentine rotating structure.

[0047] In summary, as Figure 1 The diagram shown is a schematic of the transmission structure of the cutting section of a conventional coal mining machine in the prior art; Figure 2 This is a schematic diagram of the rocker arm of a drum-type coal mining machine in the prior art. Addressing the problems of difficulty in speed adjustment of the permanent magnet motor during use, interference between the outer diameter of the permanent magnet motor and the scraper conveyor's shovel and hydraulic support beam, and excessively high operating temperature within the permanent magnet motor cavity, making disassembly and maintenance inconvenient, this utility model solves these problems by connecting the permanent magnet motor to a planetary reduction gear 7. The planetary reduction gear 7 reduces the output torque of the permanent magnet motor, thereby reducing its size and meeting the requirements of actual underground use. The permanent magnet motor stator 3 is installed in the cooling water channel with an interference fit, and the cooling water channel is installed with the cutting section housing with a clearance fit, achieving a detachable function. By installing an isolation cooling end cover 6 between the permanent magnet motor and the planetary reducer 7, the high temperature inside the permanent magnet motor can be isolated while cooling the reducer, preventing it from being transferred to the reducer. This solves the problems of difficulty in speed adjustment during use of the permanent magnet motor, interference between the outer diameter of the permanent magnet motor and the scraper conveyor shovel and hydraulic support beam, and excessively high working temperature inside the permanent magnet motor cavity, which makes disassembly and maintenance inconvenient. It can reduce the size of the permanent magnet motor to meet the requirements of actual underground use, avoid interference, and facilitate disassembly and assembly. It can cool the reducer while isolating the high temperature inside the permanent magnet motor, ensuring the operating efficiency of the coal mining machine.

[0048] Specifically, in combination Figures 4 to 6 This paper further explains how the permanent magnet integrated drive device for the cutting section of the coal mining machine of this utility model achieves thermal isolation between the permanent magnet motor and the reduction gear through a multi-layer water channel structure, while simultaneously cooling the two-stage planetary reduction gear, thus preventing the high-temperature environment inside the permanent magnet motor cavity from affecting the service life of the reduction gear. Specifically, as... Figure 4 The image shown is a schematic diagram of the first structure of the cooling water cooling path in the permanent magnet integrated drive device for the cutting section of a coal mining machine according to an embodiment of this utility model; Figure 4This includes an isolation cooling end cover water inlet pipe 61, a reducer cooling water inlet pipe 8, and an end cover water inlet pipe 9. When cooling the structure, cooling water flows in through the motor's end cover water inlet pipe 9, passes through the reducer cooling water inlet pipe 8 and the circulating water channel arranged therebetween, and then enters the isolation cooling end cover water inlet pipe 61. Figure 5 The diagram shown is a second structural schematic of the cooling water cooling path in the permanent magnet integrated drive device for the cutting section of a coal mining machine according to an embodiment of this utility model; Figure 5 This includes an isolation cooling end cover water outlet pipe 62, an isolation cooling cover plate water outlet and a permanent magnet motor cooling water jacket inlet pipe 10, and a cooling water jacket inlet pipe 41; when cooling the structure, the cooling water enters the isolation cooling water channel through the cooling water jacket inlet pipe 41, flows out from the other end of the isolation cooling water channel, and enters the isolation cooling cover plate water outlet, the permanent magnet motor cooling water jacket inlet pipe 10, and the isolation cooling end cover water outlet pipe 62 through the water channels and pipes arranged therein. Figure 6 As shown, this is a schematic diagram of the third structure of the cooling water cooling path in the permanent magnet integrated drive device of the coal mining machine cutting section according to an embodiment of the present invention; Figure 6 It includes a cooling water jacket outlet pipe 42 and an end cover circulation water channel 11. When cooling the structure, the cooling water circulates through the motor cooling water jacket and flows out from the cooling water jacket outlet pipe 42 at the other end of the cooling water jacket. It then enters the end cover circulation water channel 11 of the motor for circulation and cooling. After circulation and cooling, the cooling water flows out, completing the entire cooling process.

[0049] This utility model discloses a permanent magnet integrated drive device for the cutting section of a coal mining machine. Through practical application, it adopts a structure of a permanent magnet motor + a two-stage planetary reducer 7. Compared with the traditional coal mining machine cutting section, the transmission efficiency is increased from 90% to 96%. The speed of the high-speed input shaft is reduced from 1500 r / min to 750 r / min, and the linear speed of the high-speed input shaft rotation seal is reduced by 50%, increasing the service life by more than double. Compared with the permanent magnet motor structure in the prior art, this utility model adopts a detachable cooling water channel structure for the permanent magnet motor, allowing for individual replacement of the motor stator, which can reduce the maintenance cost of the permanent magnet motor by more than 70%. Furthermore, through the isolation water-cooling design between the permanent magnet motor and the planetary reducer 7, the thermal equilibrium temperature of the two planetary reducer 7 can be reduced by more than 40°C, ensuring that the thermal equilibrium temperature of the two planetary reducer 7 is below 80°C. This avoids irreversible damage to the reducer bearings, gears, and seals caused by excessively high permanent magnet motor cavity temperature, thus ensuring the service life of the reducer on the coal mining machine.

[0050] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Additionally, the terms "front," "back," "left," "right," "upper," and "lower" in this document refer to the placement shown in the accompanying drawings.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A permanent magnet integrated drive device for the cutting part of a coal mining machine, characterized in that: include: A cooling water jacket, wherein the cooling water jacket is installed with clearance fit to the shearer cutting part housing through a key connection; A permanent magnet motor, wherein the stator of the permanent magnet motor is interference-fitted inside the cooling water jacket, bearings are arranged at both ends of the permanent magnet motor rotor, and the cooling water jacket and the permanent magnet motor are arranged inside the housing of the cutting part of the coal mining machine; A planetary reduction gear, the planetary reduction gear is arranged on one side of the permanent magnet motor, an external spline matching the internal spline of the permanent magnet motor rotor is arranged on the primary sun gear of the planetary reduction gear, and the external spline and the internal spline of the permanent magnet motor are connected in transmission through the external spline; The isolating cooling end cover is arranged between the permanent magnet motor and the planetary reduction device, and the isolating cooling end cover is detachably connected to the stator end of the permanent magnet motor.

2. A permanent magnet integrated drive device for the cutting part of a coal mining machine according to claim 1, characterized in that: The cooling water jacket is a hollow structure.

3. A permanent magnet integrated drive device for the cutting part of a coal mining machine according to claim 1, characterized in that: The key comprises a flat key.

4. A permanent magnet integrated drive device for the cutting part of a coal mining machine according to claim 1, characterized in that: The planetary reduction gear is arranged in two stages.

5. A permanent magnet integrated drive device for the cutting part of a coal mining machine according to claim 1, characterized in that: The isolation cooling end cover is configured as a multi-layer water channel structure.

6. A permanent magnet integrated drive device for the cutting part of a coal mining machine according to claim 5, characterized in that: The multi-layer water channel structure is configured as a serpentine rotating structure.

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