Concentric-shaft permanent-magnet semi-direct-drive integrated driving device and scraper conveyor

Abstract

The invention relates to the field of coal mine underground fully mechanized coal mining face complete equipment and technologies, in particular to a concentric shaft permanent magnet semi-direct drive integrated driving device and a scraper conveyor. The driving device is formed by integrating a speed reducer, a permanent magnet motor and a chain tensioning device, the concentric shaft structural layout is adopted, the speed reducer is composed of an input-stage planetary gear train, a connecting assembly, an output-stage planetary gear train and an output flange, and the chain tensioning device is composed of a large gear, a protective cover, a hydraulic motor speed reducing device and a hydraulic cylinder. The permanent magnet motor is provided with a rotor shaft of a double-output-shaft structure, one end of the rotor shaft is connected with an input-stage sun gear of the speed reducer through a spline, the other end of the rotor shaft is connected with a large gear of the chain tensioning device through a spline, mechanical-electrical-hydraulic integrated design is achieved, a planetary gear train, a seal, a cooler, the chain tensioning device and the motor are highly integrated, the structure is compact, functions are complete, temperature rise is slow, vibration is small, and noise is low. The scraper equipped with the driving device is efficient, energy-saving, stable and reliable, and optimizes the three-machine matching property of a fully mechanized coal mining face.

Description

Technical Field

[0001] The present invention relates to the technical field of complete sets of equipment and technologies for fully-mechanized coal mining faces underground coal mines, and specifically to a concentric shaft permanent magnet semi-direct drive integrated drive device and a scraper conveyor. Background Art

[0002] As a key material conveying device in the field of coal mining, the performance of the drive device of a scraper conveyor directly affects the efficiency and reliability of the entire conveying equipment. In recent years, with the global emphasis on energy conservation and emission reduction, the permanent magnet semi-direct drive technology, as a new driving method, has gradually become the technological innovation direction of the drive device of the scraper conveyor due to its characteristics of high efficiency, energy conservation, compact structure, stability and reliability. "Permanent magnet semi-direct drive" is a relative concept, referring to the integrated one-piece of a low-speed permanent magnet motor and a reducer with a small transmission ratio. In a conventional scraper conveyor drive device, the asynchronous motor speed is close to 1500 r·min -1 , and the total transmission ratio of the three-stage gear transmission reducer is about 40. Therefore, in "permanent magnet semi-direct drive", the motor speed should be much lower than 1500 r·min -1 , and the total transmission ratio of the reducer should be much lower than 40.

[0003] In the existing permanent magnet semi-direct drive technology of scraper conveyors, there are still some technical problems that lead to its less application. Especially for high-power heavy scraper conveyors, the parallel shaft drive device occupies a large space, has a relatively complex structure, and has more energy loss; while in the concentric shaft drive device, the integration degree of the motor and the reducer is insufficient, and they are still independent of each other. The motor and the reducer are connected in series with a supporting connection cover and a coupling, etc., resulting in an overly large overall axial dimension of the drive device, which greatly affects the pedestrian space between the drive device and the hydraulic support, and even interferes with the support columns. In addition, the chain tensioning gear is arranged in the oil sump of the reducer, which is not conducive to conveniently controlling the clutch between the hydraulic motor and the motor, and there is a risk of lubricating oil leakage. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a concentric shaft permanent magnet semi-direct drive integrated drive device, which adopts an electro-mechanical-hydraulic integrated design, has a highly integrated drive device, perfect functions, improves the supporting adaptability, and provides technical support for the wide application of a high-efficiency, energy-saving, stable and reliable permanent magnet semi-direct drive device in high-power scraper conveyors.

[0005] Another purpose of the present invention is to provide a scraper conveyor, which is provided with a concentric shaft permanent magnet semi-direct drive integrated drive device. Compared with a conventional scraper conveyor, it has higher production efficiency, less downtime for maintenance and better supporting adaptability.

[0006] The object of the present invention is achieved through the following technical solutions: A concentric shaft permanent magnet semi-direct drive integrated drive device, which is integrally integrated by a speed reducer 1, a permanent magnet motor 2 and a chain tensioning device 3, and adopts a concentric shaft structural layout; the speed reducer 1 is composed of an input stage planetary gear train 11, a coupling assembly 12, an output stage planetary gear train 13 and an output flange 14; the chain tensioning device 3 is composed of a large gear 31, a shield 32, a hydraulic motor reduction device 33 and a hydraulic cylinder 34; the permanent magnet motor 2 has a rotor shaft 21 with double output shafts, one end is connected to the sun gear 111 of the input stage of the speed reducer through a spline 211, and the other end is connected to the large gear 31 of the chain tensioning device through a spline 212.

[0007] Further, the speed reducer 1 and the permanent magnet motor 2 share a seal 22, with lubricating oil inside the speed reducer on one side and grease inside the motor bearing housing on the other side.

[0008] Further, the internal gear ring 112 of the input stage of the speed reducer serves as an input flange and is directly connected to the permanent magnet motor 2 through bolts.

[0009] Further, the coupling assembly 12 of the speed reducer is welded by a flange plate A 121, a flange plate B 122, a bearing housing 123 and a cooling water pipe 124, and the flange plate A 121 and the flange plate B 122 are respectively connected to the internal gear rings of the input stage and the output stage through bolts.

[0010] Further, the cooling water pipe 124 is made of copper, is provided with a fin structure, is spirally distributed on both sides of the bearing housing 123, and is led out to the outside of the speed reducer through a joint.

[0011] Further, the permanent magnet motor 2 can be a variable frequency integrated machine or an independent motor remotely controlled by a variable frequency cabinet.

[0012] Further, the rated speed of the permanent magnet motor 2 is 800 - 1200 r·min -1 .

[0013] Further, the shield 32 of the chain tensioning device is connected to the permanent magnet motor 2 through bolts, and the engagement and disengagement of the idler 331 of the hydraulic motor reduction device 33 and the large gear 31 are controlled by the telescopic movement of the hydraulic cylinder 34.

[0014] A scraper conveyor is provided with the above-mentioned concentric shaft permanent magnet semi-direct drive integrated drive device.

[0015] After adopting the above technical solution, the beneficial effects of the present invention are mainly manifested in that the coaxial permanent magnet semi-direct drive integrated drive device is highly integrated, with a compact structure and perfect functions. Through ingenious structural designs such as sharing the seal between the motor and the reducer, winding cooling water pipes on both sides of the bearing seat, and directly connecting the double output shafts of the motor to the reducer and the chain tightening device respectively, the axial dimension of the drive device is minimized to the greatest extent, and the equipment matching adaptability is improved. The cooling system adopts copper water pipes with fin structures. Compared with the cooling water jacket, without occupying additional axial space, the flow distance of the cooling water and the heat exchange surface area are increased, resulting in a significant reduction in the oil temperature of the reducer and improving the performance of the drive device. The chain tightening large gear is arranged at the other end of the motor and does not share the oil sump with the reducer, eliminating the risk of lubricating oil leakage. Moreover, the clutch between the chain tightening device and the motor is remotely controlled by a hydraulic cylinder, reducing the manual labor intensity and accident risk of the chain tightening operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings: Figure 1 is a schematic structural diagram of a coaxial permanent magnet semi-direct drive integrated drive device; Figure 2 is Figure 1 a partial enlarged view of the shared seal between the motor and the reducer in Figure 3 is a schematic structural diagram of the reducer connection assembly; Figure 4 is Figure 3 a rotating sectional view of Figure 5 is a schematic diagram of the fin structure of the cooling water pipe; Figure 6 is a schematic diagram of the meshing state of the chain tightening device; Figure 7 is a schematic diagram of the separated state of the chain tightening device; In the figure: 1 reducer, 11 input stage planetary gear train, 111 input stage sun gear, 112 input stage internal gear ring, 12 connection assembly, 121 flange A, 122 flange B, 123 bearing seat, 124 cooling water pipe, 13 output stage planetary gear train, 14 output flange, 2 permanent magnet motor, 21 double output shaft structure rotor shaft, 211 spline connected to the reducer, 212 spline connected to the chain tightening device, 22 seal, 3 chain tightening device, 31 large gear, 32 shield, 33 hydraulic motor reduction device, 331 idler gear, 34 hydraulic cylinder, M reducer lubricating oil, N motor bearing seat lubricating grease. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The following will describe the technical solutions in the embodiments of the present invention completely and clearly in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them.

[0018] As Figure 1 shown, a concentric shaft permanent magnet semi-direct drive integrated drive device is integrally integrated by a speed reducer 1, a permanent magnet motor 2 and a chain tensioning device 3, and adopts a concentric shaft structural layout; the speed reducer 1 is composed of an input stage planetary gear train 11, a coupling assembly 12, an output stage planetary gear train 13 and an output flange 14; the chain tensioning device 3 is composed of a large gear 31, a shield 32, a hydraulic motor reduction device 33 and a hydraulic cylinder 34; the permanent magnet motor 2 has a rotor shaft 21 with a double output shaft structure, one end of which is connected to the input stage sun gear 111 of the speed reducer through a spline 211, and the other end is connected to the large gear 31 of the chain tensioning device through a spline 212.

[0019] Specifically, in the normal coal conveying condition of the scraper conveyor, the permanent magnet motor 2 transmits power to the input stage sun gear 111 of the speed reducer 1 through the spline 211 on the rotor shaft 21. After the input stage planetary gear train 21 increases the torque and reduces the speed, the power is then transmitted to the output stage planetary gear train 13. After further increasing the torque and reducing the speed, the power is transmitted to the sprocket and chain of the scraper conveyor.

[0020] As Figure 2 shown, the speed reducer 1 and the permanent magnet motor 2 share a seal 22. One side is the lubricating oil inside the speed reducer, and the other side is the grease inside the motor bearing seat. By adopting the structural form of sharing a seal, the overall axial length of the drive device can be greatly reduced.

[0021] In Figure 1 , the internal gear ring 112 of the input stage of the speed reducer serves as an input flange and is directly connected to the permanent magnet motor 2 through bolts. The speed reducer 1 does not additionally set an input flange for connecting with the permanent magnet motor 2. Therefore, the speed reducer is no longer an independent and complete equipment unit, but relies on the motor as the main body, and each component such as the shaft, gear, and coupling assembly is assembled on it one by one, making the structure of the drive device more compact, further reducing the axial length, leaving enough space for people to pass through at the head and tail of the scraper conveyor, and improving the matching adaptability of the equipment.

[0022] Further referring to Figures 3 to 5, the reducer connection assembly 12 is welded by a flange A 121, a flange B 122, a bearing housing 123 and a cooling water pipe 124. The flange A 121 and the flange B 122 are respectively connected to the input-stage and output-stage internal gear rings through bolts. Without increasing the occupied space, this connection assembly can not only support the bearings but also maximize the cooling of the reducer oil temperature to ensure that the reducer meets the requirements of thermal power. The cooling and heat exchange function is realized through the cooling water pipe 124, whose material is copper and whose surface is provided with a fin structure to increase the heat exchange surface area, as Figure 5 shown. The two cooling water pipes are spirally distributed on both sides of the bearing housing 123, led out to the outside of the reducer through joints, and several anti-loosening retaining sleeves are arranged on the outer side of the cooling water pipes along the circumferential direction to prevent faults such as the rupture and welding opening of the cooling water pipes caused by continuous vibration of the equipment.

[0023] Please refer to Figure 1 again. The permanent magnet motor 2 can be a variable frequency integrated machine or an independent motor remotely controlled by a frequency conversion cabinet. The advantage of the variable frequency integrated machine is that the integrated design simplifies the installation process, eliminates the need for complex wiring and debugging, and the communication between the frequency converter and the motor is more direct, enabling more precise control and improving the response speed and stability of the system. The advantage of the split variable frequency motor is that the frequency conversion control cabinet can be placed in the gate roadway, further reducing the occupied space of the drive device and releasing more space for the head and tail of the working face. Different technical solutions can cope with different mine operating conditions and different supporting requirements. Further, the rated speed of the permanent magnet motor 2 is 800~1200 r·min -1 . At this speed of the motor, when it is paired with a reducer with a two-stage planetary gear train, the power density of the drive device can be maximized, that is, the occupied space of the drive device is minimized under the same power.

[0024] Please refer to Figure 1 again. The chain tightener guard 32 is connected to the permanent magnet motor 2 through bolts, and the engagement and disengagement of the idler wheel 331 of the hydraulic motor reduction device 33 and the large gear 31 are controlled by the telescopic movement of the hydraulic cylinder 34. Under the normal coal conveying condition of the scraper conveyor, the idler wheel 331 and the large gear 31 are in a separated state, as Figure 7 shown. When the chain becomes slack after the long-time operation of the scraper conveyor and chain tightening operation is required, the oil cylinder 34 can be remotely controlled to extend the piston rod, thereby driving the hydraulic motor reduction device 33 to rotate downward until the idler wheel 331 meshes with the large gear 31, as Figure 6 shown. At this time, the travel switch is used to ensure that the motor is powered off, and then the hydraulic motor can be started. The hydraulic power is transmitted to the sprocket through the reduction device 33, the large gear 31, the motor rotor shaft 21 and the reducer 1, dragging the chain to reverse, thereby realizing chain tightening.

[0025] The present invention also provides a scraper conveyor, in which the above-mentioned concentric shaft permanent magnet semi-direct drive integrated drive device is arranged at the head and tail drive parts of the scraper conveyor. After adopting this drive device, the operating energy consumption of the scraper conveyor can be significantly reduced, the downtime for maintenance can be reduced, and the production efficiency of coal mine exploitation and transportation can be improved.

[0026] It should be understood that the detailed description of the technical solution of the present invention with the aid of the preferred embodiments above is illustrative rather than restrictive. Those of ordinary skill in the art can modify the technical solutions recorded in the embodiments, or perform equivalent replacements on some of the technical features, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. The concentric shaft permanent magnet semi-direct drive integrated drive device is characterized by: The reducer (1), the permanent magnet motor (2) and the chain tightening device (3) are integrated into one body and adopt a coaxial shaft structure layout; The reducer (1) is composed of an input-stage planetary gear train (11), a connecting assembly (12), an output-stage planetary gear train (13) and an output flange (14); The chain tightening device (3) is composed of a large gear (31), a protective cover (32), a hydraulic motor reduction device (33), and a hydraulic cylinder (34); The permanent magnet motor (2) has a double-shaft structure rotor shaft (21), one end of which is connected to the reducer input stage sun gear (111) via a spline (211), and the other end of which is connected to the chain tightening device large gear (31) via a spline (212).

2. The concentric shaft permanent magnet semi-direct drive integrated drive device according to claim 1, characterized in that: The reducer (1) and the permanent magnet motor (2) share a seal (22), one side of which is filled with lubricating oil in the reducer and the other side is filled with lubricating grease in the motor bearing seat.

3. The concentric shaft permanent magnet semi-direct drive integrated drive device according to claim 2, characterized in that: The reducer input stage internal gear ring (112) serves as an input flange and is directly connected to the permanent magnet motor (2) via bolts.

4. The concentric shaft permanent magnet semi-direct drive integrated drive device according to claim 3, characterized in that: The reducer coupling assembly (12) is welded together by a flange A (121), a flange B (122), a bearing seat (123) and a cooling water pipe (124), and the flange A (121) and the flange B (122) are respectively connected to the input stage and output stage inner gear rings by bolts.

5. The concentric shaft permanent magnet semi-direct drive integrated drive device according to claim 4, characterized in that: The cooling water pipe (124) is made of copper and is provided with a fin structure. It is distributed in a spiral shape on both sides of the bearing seat (123) and is led out to the outside of the reducer through a joint.

6. The concentric shaft permanent magnet semi-direct drive integrated drive device according to claim 1, characterized in that: The permanent magnet motor (2) may be an all-in-one frequency converter, or an independent motor remotely controlled by a frequency converter cabinet.

7. The concentric shaft permanent magnet semi-direct drive integrated drive device according to claim 6, characterized in that: The rated speed of the permanent magnet motor (2) is 800-1200 r·min -1 .

8. The concentric shaft permanent magnet semi-direct drive integrated drive device according to claim 1, characterized in that: The chain tightening device shield (32) is connected to the permanent magnet motor (2) by means of bolts, and the clutch of the idler wheel (331) and the large gear (31) of the hydraulic motor reduction device (33) is controlled by the extension and retraction of the hydraulic cylinder (34).

9. A scraper, characterized in that: The scraper conveyor is provided with a coaxial permanent magnet semi-direct drive integrated drive device as described in any one of claims 1 to 8.

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