Permanent-magnet semi-direct-drive electric shovel lifting mechanism and electric shovel

Abstract

The invention discloses a permanent-magnet semi-direct-drive electric shovel lifting mechanism which comprises two lifting motors driven in parallel, a lifting speed reducer, a lifting winding drum and an encoder, the lifting motors are permanent-magnet synchronous motors, the lifting speed reducer is a first-stage parallel shaft transmission speed reducer, and the encoder is a second-stage parallel shaft transmission speed reducer. Output shafts of the two lifting motors are connected to an input shaft of the lifting speed reducer through couplings respectively, the non-transmission side of each lifting motor is connected with a lifting brake, the lifting winding drum is rotationally installed between a box body of the lifting speed reducer and a lifting side support through a lifting winding drum shaft, and an output large gear of the lifting speed reducer is connected to the lifting winding drum. The encoder is connected to the speed reducer side of the lifting winding drum shaft, and a winding drum sealing assembly is arranged between the periphery of the lifting winding drum and the lifting speed reducer box body. The semi-direct-drive winding drum of the permanent magnet motor is achieved, the output torque is large, low-speed large-load drive can be achieved, the sealing effect of the winding drum is guaranteed, and the connection reliability of the encoder is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric shovels, and in particular relates to a permanent magnet semi-direct drive electric shovel lifting mechanism and an electric shovel comprising the permanent magnet semi-direct drive electric shovel lifting mechanism. Background Art

[0002] The electric shovel is a single-bucket excavator that uses transmission parts such as gears, chains, steel cables, and pulleys to transmit power. It is one of the main mining equipment in tens of millions of ton open-pit mines. It has high productivity, high operating rate, and low operating cost. It is a recognized model in the mining industry. The electric shovel consists of a traveling device, a rotating device, a working device, a lubrication system, an air supply system, a lifting mechanism, etc.

[0003] The lifting mechanism is one of the most important mechanisms of the electric shovel. The bucket is lifted and lowered by the lifting mechanism, and the lifting encoder is used for precise control to prevent the lifting mechanism from over-limit operation. Due to the harsh working conditions of the electric shovel, large vibration and impact, especially the frequent forward and reverse rotation of the lifting mechanism, whether the electric shovel can operate efficiently, reliably and stably mainly depends on the lifting mechanism.

[0004] The lifting torque required for the electric shovel is large when it is working. When the lifting mechanism adopts a DC motor or an AC variable frequency asynchronous motor, the output torque of the motor is relatively small and cannot directly drive a low-speed heavy load. At least two-stage transmission deceleration is required to meet the use requirements. In the later stage, the high-speed shaft may bend, break, or have problems with the high-speed shaft seal. During operation, the seal is prone to oil leakage and the lifting drum seal is leaking oil. In addition, the soft shaft encoder has a short service life, the connection is unreliable, and the electric shovel alarms when it is loose.

[0005] In addition, the existing lifting mechanism transmission system has low efficiency, high energy consumption, long transmission wheel chain, and high maintenance cost. With the development of permanent magnet technology, the use of permanent magnet synchronous motors with high efficiency and energy saving, large output torque, and frequent starting as power sources will surely make the electric shovel operate more efficiently, reliably and stably. However, if the permanent magnet motor direct drive drum structure is directly adopted, the permanent magnet motor is large in size, high in cost, difficult to hoist, and difficult to accurately control under the working conditions where the speed of the electric shovel is less than 20rpm. Summary of the invention

[0006] In order to solve some or all of the technical problems existing in the above-mentioned prior art, the present invention provides a permanent magnet semi-direct drive electric shovel lifting mechanism, which is arranged on the rotary main platform of the electric shovel, and the permanent magnet semi-direct drive electric shovel lifting mechanism includes two parallel driven lifting motors, a lifting reducer, a lifting drum, and an encoder, wherein:

[0007] The two lifting motors are fixedly installed on an integral lifting motor base connected to the rotary main platform. The lifting motors are permanent magnet synchronous motors. The lifting speed reducer is a first-stage parallel shaft transmission speed reducer, including two parallel input shafts and an output large gear. The output shafts of the two lifting motors are respectively connected to an input shaft of the lifting speed reducer through a first coupling. A lifting brake is connected to the non-driving side of each lifting motor.

[0008] The lifting drum is rotatably installed between a lifting side support connected to the rotary main platform and the housing of the lifting speed reducer through a lifting drum shaft. One end of the lifting drum shaft is rotatably installed on the housing of the lifting speed reducer, and the other end is rotatably installed on the lifting side support. The output large gear of the lifting speed reducer is connected to the lifting drum. The encoder is connected to the reducer side of the lifting drum shaft through a second coupling.

[0009] A drum sealing assembly is provided between the outer periphery of the lifting drum and the housing of the lifting speed reducer.

[0010] Further, in the above-mentioned permanent magnet semi-direct drive electric shovel lifting mechanism, the encoder is installed on a bracket, the second coupling is installed on the housing of the lifting speed reducer, and the second coupling is connected between the encoder and the reducer side of the lifting drum shaft, and the connecting pin shaft of the encoder is connected to the lifting drum shaft.

[0011] Further, in the above-mentioned permanent magnet semi-direct drive electric shovel lifting mechanism, the drum sealing assembly includes a V-shaped sealing ring, a first J-shaped sealing ring, a second J-shaped sealing ring, a polyurethane spacer ring arranged between the first J-shaped sealing ring and the second J-shaped sealing ring, and an oil return port provided at the lower part of the housing of the lifting speed reducer.

[0012] Further, in the above-mentioned permanent magnet semi-direct drive electric shovel lifting mechanism, the first J-shaped sealing ring and the second J-shaped sealing ring adopt a split sealing structure, and the first J-shaped sealing ring and the second J-shaped sealing ring are respectively formed by winding a sealing strip around the outer periphery of the lifting drum and then butt-joining the two ends of the sealing strip at a 45° cut.

[0013] Further, in the above-mentioned permanent magnet semi-direct drive electric shovel lifting mechanism, the butt-joining position of the cut of the first J-shaped sealing ring and the butt-joining position of the cut of the second J-shaped sealing ring are arranged in a staggered manner with respect to the central axis of the lifting drum.

[0014] Further, in the above-mentioned permanent magnet semi-direct drive electric shovel lifting mechanism, a drum sealing assembly lubrication device for injecting oil into the drum sealing assembly is provided on the housing of the lifting speed reducer.

[0015] Furthermore, in the above-mentioned permanent magnet semi-direct drive electric shovel lifting mechanism, the first coupling is a drum-type gear coupling.

[0016] Furthermore, in the above-mentioned permanent magnet semi-direct drive electric shovel lifting mechanism, the lifting brake is a hydraulic wet multi-disc brake.

[0017] On the other hand, the present invention further provides an electric shovel, which includes the above-mentioned permanent magnet semi-direct drive electric shovel lifting mechanism.

[0018] The permanent magnet semi-direct drive electric shovel lifting mechanism of the present invention has the following advantages and beneficial effects:

[0019] Two parallel-driven permanent magnet synchronous motors are used as the lifting motors, and a first-level parallel shaft transmission reducer is used as the lifting reducer to realize the semi-direct drive drum of the permanent magnet motor. The output torque is large, which is competent for low-speed and high-load driving. It is also highly efficient and energy-saving, has a short transmission wheel chain, reduces the space occupied by the electric shovel, and has low maintenance costs. It effectively avoids the occurrence of high-speed shaft bending and deformation, and shaft breakage, ensuring efficient, reliable and stable operation of the electric shovel.

[0020] By setting a new type of drum sealing assembly including a V-shaped sealing ring, two J-shaped sealing rings and a polyurethane spacer ring between the two J-shaped sealing rings, the sealing effect of the lifting drum is ensured, and the oil leakage of the lifting drum is effectively prevented;

[0021] The encoder is connected to the reducer side of the lifting drum shaft by adopting a coupling structure. The encoder is fixedly mounted on the bracket and the coupling is fixedly mounted on the lifting reducer housing. The coupling connects the encoder's connecting pin to the lifting drum shaft to ensure the reliability of the encoder connection and avoid problems such as short service life and unreliable connection of the soft shaft encoder in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings in the following descriptions are only used to further understand the embodiments of the present invention and constitute a part of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0023] Figure 1 This is a front view of the permanent magnet semi-direct drive electric shovel lifting mechanism of the present invention;

[0024] Figure 2 It is a top view of the permanent magnet semi-direct drive electric shovel lifting mechanism of the present invention;

[0025] Figure 3 is along Figure 1Sectional view of AA in the middle;

[0026] Figure 4 is along Figure 1 Middle BB is a cross-sectional view;

[0027] Figure 5 yes Figure 4 The enlarged schematic diagram of the middle C part;

[0028] Figure 6 It is a structural schematic diagram of a lifting drum sealing assembly in a permanent magnet semi-direct drive electric shovel lifting mechanism of the present invention;

[0029] Figure 7 It is a schematic diagram of the staggered arrangement of the J-shaped sealing ring of the lifting drum sealing assembly in the permanent magnet semi-direct drive electric shovel lifting mechanism of the present invention.

[0030] Description of reference numerals:

[0031] 1-lifting motor, 2-first coupling, 3-lifting reducer, 31-input shaft, 32-output large gear, 33-box, 4-lifting brake, 5-lifting motor seat, 6-lifting drum, 7-lifting drum shaft, 8-lifting side support, 9-lifting wire rope, 10-encoder, 11-drum sealing assembly, 111-V-type sealing ring, 112-first J-type sealing ring, 113-second J-type sealing ring, 114-polyurethane spacer ring, 115-oil return port, 12-drum sealing assembly lubrication device, 13-second coupling, 100-rotating main platform. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] like Figures 1 to 7As shown, the permanent magnet semi-direct drive electric shovel lifting mechanism provided by the present invention is arranged on the rotary main platform 100 of the electric shovel, including two lifting motors 1 driven in parallel, a lifting reducer 3, a lifting drum 6, and an encoder 10. The two lifting motors 1 are fixedly mounted on an integrated lifting motor seat 5, and the lifting motor seat 5 is positioned by a stop and connected to the rotary main platform 100 of the electric shovel through a plurality of super nuts. The lifting reducer 3 is a first-level parallel shaft transmission reducer, including two parallel input shafts 31 and an output large gear 32. The output shafts of the two lifting motors 1 are respectively connected to the lifting reducer through a first coupling 2 3 has an input shaft 31, and on the non-drive side of each lifting motor 1, a lifting brake 4 is connected by a stopper positioning and bolts, and the lifting drum 6 is rotatably installed through the lifting drum shaft 7 between the lifting side support 8 and the housing 33 of the lifting reducer 3 on the rotating main platform 100 of the electric shovel through the stopper positioning and bolts, that is, one end of the lifting drum shaft 7 is rotatably installed on the housing 33 of the lifting reducer 3, and the other end is rotatably installed on the lifting side support 8, the output gear 32 of the lifting reducer 3 is connected to the lifting drum 6, and the encoder 10 is connected to the reducer side of the lifting drum shaft 7 through the second coupling 13.

[0034] In the above-mentioned permanent magnet semi-direct drive electric shovel lifting mechanism, two parallel lifting motors 1 synchronously drive the lifting reducer 3. The output large gear 32 of the lifting reducer 3 drives the lifting drum shaft 7 to rotate under the synchronous drive of the two input shafts 31, thereby rotating the lifting drum 6, realizing the retraction and release of the lifting wire rope 9 wound on the lifting drum 6, thereby realizing the lifting and lowering of the electric shovel bucket. The bucket cooperates with the pushing mechanism to complete the loading and unloading of materials.

[0035] Furthermore, in the permanent magnet semi-direct drive electric shovel lifting mechanism of the present invention, a drum sealing assembly 11 is provided between the outer periphery of the lifting drum 6 and the housing 33 of the lifting reducer 3 to effectively prevent the lifting drum 6 from leaking oil. Figure 6 As shown, the drum sealing assembly 11 includes a V-shaped sealing ring 111, a first J-shaped sealing ring 112, a second J-shaped sealing ring 113, a polyurethane spacer ring 113 arranged between the first J-shaped sealing ring 112 and the second J-shaped sealing ring 113, and an oil return port 115 arranged at the lower part of the housing 33 of the lifting reducer 3.

[0036] Furthermore, in the permanent magnet semi-direct drive electric shovel lifting mechanism of the present invention, a drum seal assembly lubrication device 12 is provided on the housing 33 of the lifting reducer 3 for injecting oil into the drum seal assembly 11 to ensure the drum sealing effect.

[0037] As a specific implementation method, Figure 7As shown, the first J-shaped sealing ring 112 and the second J-shaped sealing ring 113 of the drum sealing assembly 11 both adopt a split sealing structure, that is, the first J-shaped sealing ring 112 and the second J-shaped sealing ring 113 are respectively formed by winding a sealing strip around the outer periphery of the lifting drum 6 and then butting the two ends of the sealing strip at a 45° cut. Preferably, in order to further improve the effect of preventing oil leakage of the lifting drum 6, the butt joint position of the cut of the first J-shaped sealing ring 112 and the butt joint position of the cut of the second J-shaped sealing ring 113 are staggered relative to the central axis of the lifting drum 6.

[0038] For example, Figure 7 As shown in (a) and (b), the cut-out docking position of the first J-type sealing ring 112 is offset to the left by 25° relative to the central axis of the lifting drum 6, and the cut-out docking position of the second J-type sealing ring 113 is offset to the right by 25° relative to the central axis of the lifting drum 6. Therefore, the cut-out docking position of the first J-type sealing ring 112 and the cut-out docking position of the second J-type sealing ring 113 are offset by 50° relative to the central axis of the lifting drum 6.

[0039] Furthermore, in the permanent magnet semi-direct drive electric shovel lifting mechanism of the present invention, in order to ensure the reliability of the encoder 10 connection, as Figure 5 As shown, the encoder 10 is mounted on the bracket, the second coupling 13 is mounted on the housing 33 of the lifting reducer 3, the second coupling 13 is connected between the encoder 10 and the reducer side of the lifting drum shaft 7, and the connecting pin of the encoder 10 is connected to the lifting drum shaft 7. Therefore, during the rotation of the lifting drum shaft 7 to perform the lifting and lowering operation of the electric shovel bucket, the encoder 10 detects the angular displacement data of the lifting drum shaft 7 in real time and converts it into the required electric pulse signal to assist the automatic control of the electric shovel operation. At the same time, since the encoder 10 is fixedly mounted on the bracket and the second coupling 13 is fixedly mounted on the housing 33, it is ensured that the encoder 10 is connected reliably without the risk of loosening.

[0040] As a specific implementation, in the permanent magnet semi-direct drive electric shovel lifting mechanism of the present invention, the lifting motor 1 is a permanent magnet synchronous motor.

[0041] As a specific implementation, in the permanent magnet semi-direct drive electric shovel lifting mechanism of the present invention, the first coupling 2 adopts a drum-type gear coupling.

[0042] As a specific implementation, in the permanent magnet semi-direct drive electric shovel lifting mechanism of the present invention, the lifting brake 4 is a hydraulic wet multi-disc brake.

[0043] In summary, compared with the prior art, the permanent magnet semi-direct drive electric shovel lifting mechanism of the present invention has the following advantages and beneficial effects:

[0044] (1) The present invention uses two permanent magnet synchronous motors driven in parallel as the lifting motors, and uses a first-level parallel shaft transmission reducer as the lifting reducer, so as to realize the semi-direct drive drum of the permanent magnet motor, and has a large output torque, which is competent for driving at low speed and large load, and is highly efficient and energy-saving, has a short transmission wheel chain, reduces the space occupied by the electric shovel, and has a low maintenance cost, and effectively avoids the occurrence of high-speed shaft bending deformation and shaft breakage, thereby ensuring the efficient, reliable and stable operation of the electric shovel;

[0045] (2) The present invention provides a drum sealing assembly having a novel structure including a V-shaped sealing ring, two J-shaped sealing rings and a polyurethane spacer ring between the two J-shaped sealing rings, thereby ensuring the sealing effect of the lifting drum and effectively preventing oil leakage from the lifting drum;

[0046] (3) The present invention connects the encoder to the reducer side of the lifting drum shaft by adopting a coupling structure. The encoder is fixedly mounted on the bracket and the coupling is fixedly mounted on the lifting reducer housing. The coupling connects the connecting pin of the encoder to the lifting drum shaft to ensure the reliability of the encoder connection and avoid the problems of short service life and unreliable connection of the soft shaft encoder in the prior art.

[0047] It should be noted that, in this article, unless otherwise clearly specified and limited, the term "connection" or its synonyms should be understood in a broad sense. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. Moreover, expressions such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. At the same time, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a process, method, article or device. In addition, "front", "back", "left", "right", "upper" and "lower" in this article are all referenced to the placement state shown in the accompanying drawings.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A permanent magnet semi-direct drive electric shovel lifting mechanism, arranged on the rotary main platform of the electric shovel, characterized in that: The permanent magnet semi-direct drive electric shovel lifting mechanism includes two parallel driven lifting motors, a lifting reducer, a lifting drum, and an encoder, wherein: The two lifting motors are fixedly mounted on an integrated lifting motor seat connected to the rotary main platform. The lifting motors are permanent magnet synchronous motors. The lifting reducer is a first-stage parallel shaft transmission reducer, including two parallel input shafts and an output large gear. The output shafts of the two lifting motors are respectively connected to an input shaft of the lifting reducer through a first coupling. A lifting brake is connected to the non-driving side of each lifting motor. The lifting drum is rotatably mounted between the lifting side support connected to the rotary main platform and the housing of the lifting reducer through the lifting drum shaft, wherein one end of the lifting drum shaft is rotatably mounted on the housing of the lifting reducer and the other end is rotatably mounted on the lifting side support, the output gear of the lifting reducer is connected to the lifting drum, and the encoder is connected to the reducer side of the lifting drum shaft through a second coupling; A drum sealing assembly is arranged between the outer periphery of the lifting drum and the casing of the lifting reducer.

2. The permanent magnet semi-direct drive electric shovel lifting mechanism according to claim 1 is characterized in that: The encoder is mounted on a bracket, the second coupling is mounted on a housing of the lifting reducer, the second coupling is connected between the encoder and the reducer side of the lifting drum shaft, and the coupling pin of the encoder is connected to the lifting drum shaft.

3. The permanent magnet semi-direct drive electric shovel lifting mechanism according to claim 1 is characterized in that: The drum sealing assembly includes a V-shaped sealing ring, a first J-shaped sealing ring, a second J-shaped sealing ring, a polyurethane spacer ring arranged between the first J-shaped sealing ring and the second J-shaped sealing ring, and an oil return port arranged at the lower part of the housing of the lifting reducer.

4. The permanent magnet semi-direct drive electric shovel lifting mechanism according to claim 3 is characterized in that: The first J-shaped sealing ring and the second J-shaped sealing ring adopt a split sealing structure, wherein the first J-shaped sealing ring and the second J-shaped sealing ring are respectively formed by winding a sealing strip around the outer periphery of the lifting drum and then butting both ends of the sealing strip at a 45° cut.

5. The permanent magnet semi-direct drive electric shovel lifting mechanism according to claim 4 is characterized in that: The notch docking position of the first J-shaped sealing ring and the notch docking position of the second J-shaped sealing ring are staggered relative to the central axis of the lifting drum.

6. The permanent magnet semi-direct drive electric shovel lifting mechanism according to claim 1 is characterized in that: A drum seal assembly lubricating device for injecting oil into the drum seal assembly is arranged on the housing of the lifting reducer.

7. The permanent magnet semi-direct drive electric shovel lifting mechanism according to claim 1 is characterized in that: The first coupling is a drum-type gear coupling.

8. The permanent magnet semi-direct drive electric shovel lifting mechanism according to claim 1 is characterized in that: The lifting brake is a hydraulic wet multi-disc brake.

9. An electric shovel, characterized in that: The electric shovel comprises the permanent magnet semi-direct drive electric shovel lifting mechanism according to any one of claims 1-8.

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