A modified structure for off-axis motor drive of a wet longitudinal drawing machine

Abstract

This utility model discloses a modified structure for an off-axis drive of a motor used in a wet longitudinal drawing machine. It includes a main drive shaft and a motor housing. The main drive shaft and the motor housing are connected by a front end cover and a rear end cover. A motor stator is located on the inner wall of the motor housing. Two bearings and two oil seals are respectively fitted onto the outer circumference of the main drive shaft. A rotor core and a rotor magnetic ring are also fitted onto the outer circumference of the main drive shaft. The rear end cover is connected to a motor mounting bracket. This utility model has a simple structure, and the provided off-axis drive structure has advantages such as structural stability, easy maintenance, and reliable operation. It can effectively utilize the high torque output advantage of a coaxial motor. The structure is compact, the assembly process is simple, and the technical requirements for operators are low, significantly improving on-site installation and maintenance efficiency.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery separator technology, specifically a modified structure for the off-axis drive of a motor used in a wet longitudinal drawing machine. Background Technology

[0002] In modern materials processing equipment, coaxial motors are widely used to drive key components such as stretching rollers and guide rollers due to their advantages of compact structure, high transmission efficiency, and fast response speed, enabling continuous and high-precision processing of materials such as films, metal strips, and fibers. However, in actual operation, the runout phenomenon at the shaft end of the stretching roller during high-speed rotation causes the coaxial motor rotor support bearing, which is directly connected to the shaft end, to bear additional radial and axial alternating loads, which can easily lead to premature wear or fatigue damage of the bearing.

[0003] When bearings are damaged, they not only directly affect the smooth operation of the motor, but may also cause a relative positional shift between the rotor and stator, resulting in a "stator rubbing" phenomenon. This can further damage the stator coil insulation layer, leading to serious malfunctions such as short circuits, overheating, or even motor burnout. Frequent occurrences of such malfunctions severely reduce the operational reliability of the equipment, increase maintenance frequency and downtime, and have a significant negative impact on the continuity, stability, and product quality control of the production line.

[0004] To address these issues, some original equipment manufacturers (OEMs) have proposed improved structural solutions, such as adding intermediate couplings, using floating supports, or introducing independent drive units. While these solutions alleviate the impact of shaft runout on the motor to some extent, they typically involve overall structural reconstruction, resulting in high modification costs and requiring extended downtime for installation and commissioning. This makes it difficult to meet the actual needs of enterprises to reduce maintenance costs and improve production efficiency. Therefore, a modified motor drive structure for wet longitudinal drawing machines is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a modified structure for the off-axis drive of a motor in a wet longitudinal drawing machine, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a modified structure for the off-axis drive of a motor in a wet longitudinal drawing machine, comprising a main drive shaft and a motor housing, wherein the main drive shaft and the motor housing are connected by a front end cover and a rear end cover, a motor stator is provided on the inner wall of the motor housing, two bearings and two skeleton oil seals are respectively fitted on the outer circumferential surface of the main drive shaft, and a rotor core and a rotor magnetic ring are also fitted on the outer circumferential surface of the main drive shaft, wherein the rear end cover is connected to a motor mounting frame.

[0007] As a further embodiment of this utility model: keyways and reamed holes are respectively provided at both ends of the main drive shaft. The keyways are used to connect the universal joint, and the reamed holes are used to fix the encoder.

[0008] As a further embodiment of this invention: the two skeleton oil seals are located on opposite sides of the two bearings.

[0009] As a further embodiment of this invention: a gap is formed between the bearing and the skeleton oil seal, and a shaft stop is installed in the gap.

[0010] As a further embodiment of this utility model: the outer rings of the two skeleton oil seals are respectively adapted to the inner rings of the rear end cover and the front end cover.

[0011] As a further embodiment of this utility model: the rear end cover is provided with a stepped circle, and the motor fixing bracket is provided with an inner hole adapted to the stepped circle, and the inner hole and the stepped circle are in clearance fit.

[0012] Compared with the prior art, the beneficial effects of this utility model are: The off-axis drive structure for motors provided in this application has advantages such as structural stability, easy maintenance, and reliable operation, effectively leveraging the high torque output of coaxial motors. This structure features a compact design, simple assembly process, and low skill requirements for operators, significantly improving on-site installation and maintenance efficiency and avoiding the reliance on experienced engineers for troubleshooting inherent in traditional structures. Compared to existing production lines that use high-power three-phase asynchronous motors and large couplings to meet torque demands, resulting in bulky structures and complex assembly, this structure achieves off-axis drive while retaining the compactness and high integration of the original coaxial motor drive, with a small footprint and high space utilization. Furthermore, the equipment modification process does not require disruption of on-site purification facilities, making it suitable for production environments with strict environmental requirements, such as cleanrooms, demonstrating good feasibility, economic viability, and application potential. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the motor assembly of this utility model; Figure 2 This is a schematic diagram of the disassembled motor of this utility model; Figure 3 This is a schematic diagram of the combination of the motor and the motor mounting bracket of this utility model; Figure 4 This is a schematic diagram of the rear end cover of this utility model; Figure 5 This is a schematic diagram of the front cover of this utility model; Figure 6 This is a schematic diagram of the main drive shaft of this utility model; In the diagram: 1. Motor housing; 2. Motor stator; 3. Rotor core; 4. Rotor magnetic ring; 5. Bearing; 6. Oil seal; 7. Rear end cover; 8. Front end cover; 9. Shaft stop; 10. Main drive shaft; 11. Encoder; 12. Motor mounting bracket. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figure 1-6 In this embodiment of the present invention, a modified structure for the off-axis drive of a motor for a wet longitudinal drawing machine includes a main drive shaft 10 and a motor housing 1. The main drive shaft 10 and the motor housing 1 are connected by a front end cover 8 and a rear end cover 7. A motor stator 2 is provided on the inner wall of the motor housing 1. Two bearings 5 ​​and two skeleton oil seals 6 are respectively fitted on the outer peripheral surface of the main drive shaft 10. The two skeleton oil seals 6 are respectively located on the side of the two bearings 5 ​​that are far apart from each other. A rotor core 3 and a rotor magnetic ring 4 are also fitted on the outer peripheral surface of the main drive shaft 10. The rear end cover 7 is connected to the motor fixing frame 12.

[0016] Specifically, the large inner holes of the front cover 8 and the rear cover 7 respectively mate with the stepped surfaces at both ends of the motor housing 1 to achieve radial positioning. The front cover 8 and the rear cover 7 are bolted to the motor housing 1 through the indexing bolt holes to achieve axial fixation.

[0017] The outer rings of the two bearings 5 ​​are respectively installed in the bearing holes of the front cover 8 and the rear cover 7 to form an interference fit; the inner ring of the bearing 5 is tightly fitted with the two bearing positions on the main drive shaft 10 to achieve rotational support. The bearing 5 has a certain clearance in the axial direction to compensate for the cumulative errors that may occur in the machining and assembly of the rear cover 7, the front cover 8 and the main drive shaft 10, to prevent the end face of the bearing 5 from being jammed, and to ensure that it can rotate freely. A shaft stop 9 is installed in this clearance.

[0018] The outer rings of the two skeleton oil seals 6 are tightly fitted with the inner holes of the front cover 8 and the rear cover 7, respectively, while the inner rings are in clearance fit with the front end of the bearing seat of the main drive shaft 10. This design not only ensures the sealing of the lubrication cavity, but also effectively prevents grease from seeping into the rotor core 3 and rotor magnetic ring 4 area, avoiding contamination and performance degradation.

[0019] The rotor core 3 and rotor magnetic ring 4 are installed sequentially on the large outer circumference section of the main drive shaft 10 according to the assembly sequence. The rotor core 3 is fixed to the main drive shaft 10 by a standard tensioning sleeve to achieve reliable transmission.

[0020] The outer ring of the motor stator 2 fits tightly with the inner hole of the motor housing 1, and is fixed and axially positioned by applying glue for sealing, while also enhancing the anti-loosening and moisture-proof performance.

[0021] The front cover 8, the rear cover 7, and the motor housing 1 together form a sealed drive cavity, in which the motor stator 2, rotor core 3, rotor magnetic ring 4, bearing 5, and skeleton oil seal 6 are all arranged. The main drive shaft 10 passes through the front cover 8 and the motor housing 1 and extends into the rear cover 7, forming a complete rotary transmission structure. The lubrication system is designed in a "top-in, bottom-out" manner, that is, grease is injected from the upper oil hole, circulates internally, and is discharged from the lower oil drain hole, ensuring sufficient lubrication while facilitating the discharge of old oil and impurities, improving maintenance convenience and lubrication reliability.

[0022] The above solution involves measuring the dimensions of each component of the original coaxial motor during maintenance, and combining the product operating conditions (current, torque, etc.). A new off-axis drive structure is used, while retaining the key components of the original coaxial motor (stator, rotor, housing). The total cost of the production line modification is only 1 / 25 of the original manufacturer's solution, and the downtime is reduced to 1 / 16 of the original manufacturer's solution. There has been no downtime since the modification was completed more than a year ago, and the economic benefits are very considerable according to financial calculations.

[0023] Please see Figure 1 In one embodiment, preferably, the main drive shaft 10 has a keyway and a reamed hole at both ends. The keyway is used to connect the universal joint, and the reamed hole is used to fix the encoder 11. The motor speed is controlled by assembling the encoder 11.

[0024] Please see Figure 2 In one embodiment, preferably, the rear end cover 7 has a stepped circle, and the motor mounting bracket 12 has an inner hole adapted to the stepped circle. The inner hole and the stepped circle are in clearance fit, which facilitates the assembly of the motor and its overall mounting onto the motor mounting bracket 12. Disassembly is the reverse. The eight indexing countersunk holes around the inner hole on the motor mounting bracket 12 are bolted to the eight bolt holes on the rear end cover 7 to fix the entire assembled motor. The four bolt holes at the bottom of the motor mounting bracket 12 are used to adjust the level of the mechanism, and the four holes are used to drill anchor bolts to fix the entire mechanism.

[0025] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0026] Therefore, the above description is only a preferred embodiment of this application and is not intended to limit the scope of this application; that is, all equivalent modifications made in accordance with the scope of the claims of this application shall be within the protection scope of the claims of this application.

Claims

1. A structure for retrofitting the motor drive of a wet longitudinal drawing machine, characterized in that, The device includes a main drive shaft and a motor housing. The main drive shaft and the motor housing are connected by a front end cover and a rear end cover. A motor stator is provided on the inner wall of the motor housing. Two bearings and two skeleton oil seals are respectively fitted on the outer circumferential surface of the main drive shaft. A rotor core and a rotor magnetic ring are also fitted on the outer circumferential surface of the main drive shaft. The rear end cover is connected to the motor mounting bracket.

2. The off-axis drive modification structure for a wet longitudinal drawing machine according to claim 1, characterized in that, The main drive shaft has a keyway and a reamed hole at both ends. The keyway is used to connect the universal joint, and the reamed hole is used to fix the encoder.

3. The off-axis drive modification structure for a wet longitudinal drawing machine according to claim 1, characterized in that, The two skeleton oil seals are located on opposite sides of the two bearings.

4. The off-axis drive modification structure for a wet longitudinal drawing machine according to claim 1, characterized in that, A gap is formed between the bearing and the skeleton oil seal, and a shaft stop is installed in the gap.

5. The off-axis drive modification structure for a wet longitudinal drawing machine according to claim 1, characterized in that, The outer rings of the two skeleton oil seals are respectively adapted to the inner rings of the rear end cover and the front end cover.

6. The off-axis drive modification structure for a wet longitudinal drawing machine according to claim 1, characterized in that, The rear end cover has a stepped circle, and the motor mounting bracket has an inner hole that matches the stepped circle. The inner hole and the stepped circle are in clearance fit.

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