Safety redundancy type magnetorheological fluid driving roller with braking function

Abstract

The safety redundancy type magnetorheological fluid driving roller with the braking function comprises an inner rotor assembly and an outer rotor assembly, the inner rotor assembly comprises a main shaft, the main shaft is sleeved with an inner rotor, a plurality of magnet exciting coils are arranged on the outer surface of the inner rotor in the circumferential direction, and the inner rotor is sleeved with a silicon steel sheet; the excitation coil is located between the inner rotor and the silicon steel sheet; the outer rotor assembly comprises a rotor outer cylinder, the front end of the rotor outer cylinder is connected with a front end cover, the rear end of the rotor outer cylinder is connected with a rear end cover, rotor magnetic steel is coaxially nested in the rotor outer cylinder, a nylon pressing strip is arranged in the rotor magnetic steel, and a magnetic isolation ring is attached to the inner surface of a magnetic conductive ring; gaps between the nylon pressing strips and the silicon steel sheets are filled with magnetorheological fluid. And the heat dissipation pipe and the magnetorheological fluid are added, so that the purposes of heat dissipation, flexible driving and braking of the driving roller are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of permanent magnet drive devices, and particularly relates to a safety redundant type magnetorheological fluid drive drum with a braking function. Background Art

[0002] Material conveying plays an important role in industries such as mines, ports, power, and chemical industries. In order to meet the requirements of efficient and stable material conveying, traditional drive methods have problems such as low efficiency, poor safety and reliability, and high maintenance costs. Therefore, permanent magnet drive drums are designed and installed on the drums of conveyor belts to achieve the drive function, simplify the transmission structure, and improve the reliability of the transmission system. However, at present, permanent magnet drive drums cannot achieve flexible drive and braking, and generally have the problem of low safety redundancy. Summary of the Invention

[0003] The purpose of the invention is to add magnetorheological fluid between the outer rotor assembly and the inner rotor assembly to solve the problems in the above background art that the current permanent magnet drive drums cannot achieve flexible drive and braking and generally have low safety redundancy.

[0004] The specific technical solution of the invention is as follows: A safety redundant type magnetorheological fluid drive drum with a braking function includes an inner rotor assembly and an outer rotor assembly. The inner rotor assembly includes a main shaft, and an inner rotor is sleeved outside the main shaft. A plurality of exciting coils are circumferentially arranged on the outer surface of the inner rotor. The plurality of exciting coils are circumferentially arrayed on the outer surface of the inner rotor. The plurality of exciting coils in the same circumferential direction are connected in series as a group, and each group of exciting coils is independently powered. A silicon steel sheet is sleeved outside the inner rotor, and the exciting coils are located between the inner rotor and the silicon steel sheet. The outer rotor assembly includes a rotor outer cylinder, a front end cover is connected to the front end of the rotor outer cylinder, and a rear end cover is connected to the rear end of the rotor outer cylinder. A rotor magnet is coaxially nested inside the rotor outer cylinder. A nylon pressing strip is arranged inside the rotor magnet, and the inner surface of the nylon pressing strip is attached with a plurality of permanent magnets and a plurality of magnetic conduction rings. The permanent magnets and the magnetic conduction rings are arranged at intervals, and a magnetic isolation ring is attached to the inner surface of the magnetic conduction ring. Heat dissipation pipes are circumferentially arranged outside the silicon steel sheet, and magnetorheological fluid is filled in the gap between the nylon pressing strip and the silicon steel sheet.

[0005] Further, a plurality of webs are circumferentially arranged on the inner surface of the inner rotor, and the inner rotor is connected to the main shaft through the plurality of webs.

[0006] Further, the plurality of webs are connected to the main shaft through flat keys.

[0007] Further, an external spline is arranged at the power input end of the main shaft.

[0008] Further, the main shaft is provided with a wire passing channel, and an external power supply cable enters the drive drum through the wire passing channel to supply power to the exciting coils.

[0009] Furthermore, a heat dissipation pipe is provided between the inner rotor assembly and the outer rotor assembly.

[0010] Furthermore, the heat dissipation pipe is an axially bent-back pipe. The heat dissipation pipe is circumferentially attached to the outer surface of the silicon steel sheet. The heat dissipation pipe is provided with a liquid inlet pipe and a liquid outlet pipe. The liquid inlet pipe and the liquid outlet pipe are located on the same side of the heat dissipation pipe and are oppositely arranged. The liquid inlet pipe is connected to the inner bend of the axially bent-back pipe, and the liquid outlet pipe is connected to the outer bend of the axially bent-back pipe.

[0011] Furthermore, the rotor outer cylinder is connected with a caliper brake. The caliper brake is located between the rotor outer cylinder and the rear end cover. The caliper brake, the rotor outer cylinder and the rear end cover are connected together by fastening bolts.

[0012] Furthermore, the caliper brake is provided with a brake disc. Oppositely arranged opposed calipers are provided on both sides of the brake disc. The brake disc is provided with a shaft hole adapted to the main shaft. The main shaft and the brake disc are connected by fitting through the shaft hole.

[0013] Furthermore, a bearing is provided in the shaft hole. The bearing is sleeved on the outer periphery of the main shaft. The main shaft is connected to the brake disc through the bearing.

[0014] Compared with the prior art, the present invention has the following beneficial effects: By filling magnetorheological fluid in the gaps between the inner rotor assembly, the outer rotor assembly and the heat dissipation pipe, when the excitation coil is energized, the "solid-liquid conversion" characteristic of the magnetorheological fluid is utilized to achieve the flexible drive and braking of the drive drum. Each group of excitation coils is independently powered. When one of the excitation coils fails due to power failure, the braking effect on the overall drive drum is less affected, making the drive drum have a high safety redundancy.

[0015] When the drive drum is operating, the heat dissipation performance of the drive drum is improved through the heat dissipation pipe provided between the inner rotor assembly and the outer rotor assembly, increasing the operating stability of the drive drum. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a sectional view of an embodiment of the present invention; Figure 2 is an assembly schematic diagram of a permanent magnet, a magnetic conduction ring and a magnetic isolation ring in an embodiment of the present invention; Figure 3 is a three-dimensional structural schematic diagram of a heat dissipation pipe in an embodiment of the present invention; Reference Signs: 1, main shaft; 11, wire passing channel; 12, external spline; 2, inner rotor; 21, spoke plate; 3, excitation coil; 4, silicon steel sheet; 5, rotor outer cylinder; 51, front end cover; 52, rear end cover; 53, rotor magnet; 54, nylon pressing strip; 6. Heat dissipation pipe; 61. Liquid inlet pipe; 62. Liquid outlet pipe; 7. Magnetorheological fluid; 8. Permanent magnet; 81. Magnetic conduction ring; 82. Magnetic isolation ring; 9. Clamp type brake; 91. Brake disc; 92. Opposed caliper; 93. Bearing. Detailed implementation manners

[0017] In order to better understand the purpose, structure and function of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0018] Refer to Figures 1 to 3, this embodiment discloses a safety redundant magnetorheological fluid drive roller with a braking function, which includes an inner rotor assembly and an outer rotor assembly. The inner rotor assembly includes a main shaft 1, and an inner rotor 2 is sleeved outside the main shaft 1. A plurality of excitation coils 3 are circumferentially arranged on the outer surface of the inner rotor 2. The excitation coils 3 achieve efficient conversion between electrical energy and mechanical energy through electromagnetic induction. The plurality of excitation coils 3 are circumferentially and arrayedly distributed on the outer surface of the inner rotor 2. The plurality of excitation coils 3 in the same circumferential direction are connected in series as a group, and each group of excitation coils 3 is independently powered. When one group of excitation coils 3 fails due to power failure, the impact on the overall braking effect of the drive roller is relatively small, making the drive roller have a high safety redundancy. An iron core sheet 4 is sleeved outside the inner rotor 2. The iron core sheet of silicon steel has a small hysteresis loop area and low energy loss during magnetization, significantly reducing heat generation and improving the energy efficiency of the drive roller. The excitation coils 3 are located between the inner rotor 2 and the iron core sheet 4; The outer rotor assembly includes a rotor outer cylinder 5. A front end cover 51 is connected to the front end of the rotor outer cylinder 5, and a rear end cover 52 is connected to the rear end of the rotor outer cylinder 5. A rotor magnet 53 is coaxially nested inside the rotor outer cylinder 5. A nylon pressing strip 54 is arranged inside the rotor magnet 53. The nylon pressing strip 54 tightly presses the rotor magnet 53 against the inner wall of the rotor outer cylinder 5. The rotor magnet 53 is directly attached to the inner wall of the rotor outer cylinder 5. The magnetic field is close to the air gap, with a high magnetic field intensity and a large torque output. The inner surface of the nylon pressing strip 54 is fitted with a plurality of permanent magnets 8 and a plurality of magnetic conduction rings 81. The permanent magnets 8 and the magnetic conduction rings 81 are arranged at intervals. A magnetic isolation ring 82 is fitted on the inner surface of the magnetic conduction ring 81. The magnetic conduction ring 81 serves as a magnetic circuit channel, efficiently guiding the magnetic field generated by the permanent magnet 8 to the gap between the magnetic conduction ring 81 and the iron core sheet 4. The magnetic isolation ring 82 blocks the lateral diffusion of the magnetic field, forcing the magnetic induction lines to act concentratedly in the gap between the magnetic conduction ring 81 and the iron core sheet 4, forming a magnetic sealing structure. The magnetic field generated by the permanent magnet 8 acts on the magnetorheological fluid 7 distributed in the gap between the magnetic conduction ring 81 and the iron core sheet 4. The magnetorheological fluid 7 is filled in the gaps between the inner rotor assembly, the outer rotor assembly, and the heat dissipation pipe 6. When the excitation coils 3 are energized, the "solid-liquid conversion" characteristic of the magnetorheological fluid 7 is utilized to achieve flexible driving and braking of the drive roller, with good controllability and wide adaptability. Moreover, the magnetorheological fluid 7 can reduce the air gap magnetic resistance and enhance the magnetic induction in the working gap, thereby improving the power density of the device.

[0019] A number of spoke plates 21 are circumferentially arranged on the inner surface of the inner rotor 2. The number of spoke plates 21 connect the main shaft 1 and the inner rotor 2 and transmit the torque and power when the inner rotor 2 rotates. Through the hollow structure formed by the number of spoke plates 21, while ensuring the strength, the weight of the main shaft 1 is greatly reduced, the inertial resistance is reduced, and the dynamic response speed of the driving roller is improved. The gaps between the number of spoke plates 21 can form an air flow channel to promote the flow of air and contribute to the heat dissipation of the driving roller. The number of spoke plates 21 are connected to the main shaft 1 through flat keys. In this embodiment, the spoke plates 21 are symmetrically arranged on the inner surface of the inner rotor 2, and flat keys are provided at the top of the spoke plates 21. Grooves adapted to the flat keys are symmetrically opened on the outer surface of the main shaft 1. The symmetrical grooving does not affect the strength of the main shaft 1, and the flat key connection is convenient for disassembly and is helpful for later maintenance.

[0020] An external spline 12 is provided at the power input end of the main shaft 1. In this embodiment, the external spline 12 is a rectangular spline, which has the characteristics of strong load-bearing capacity and is suitable for high-torque transmission.

[0021] A heat dissipation pipe 6 is provided between the inner rotor assembly and the outer rotor assembly. The heat dissipation pipe 6 is an axially bent-back pipe. The heat dissipation pipe 6 is circumferentially attached to the outer surface of the silicon steel sheet 4, and the thermal expansion and contraction stress caused by temperature change is absorbed through the elastic deformation between the bent-back pipes, avoiding pipe deformation or interface leakage caused by rigid connection. The bent-back design of the heat dissipation pipe 6 reduces the fluid flow dead zone, strengthens heat transfer, and makes the heat dissipation more uniform. The heat dissipation pipe 6 is provided with an inlet pipe 61 and an outlet pipe 62. The inlet pipe 61 and the outlet pipe 62 are located on the same side of the heat dissipation pipe 6 and are oppositely arranged. The inlet pipe 61 is connected to the inner bend of the axially bent-back pipe, and the outlet pipe 62 is connected to the outer bend of the axially bent-back pipe. The coolant enters the heat dissipation pipe 6 from the inlet pipe 61 and is divided into two parts at the inner bend, so that the two sides inside the driving roller are evenly cooled. The coolant on both sides converges at the outlet pipe 62 located at the outer bend and is discharged from the heat dissipation pipe 6 at the same time. In this way, the coolant can be discharged smoothly and quickly, preventing the coolant from accumulating at the outlet pipe 62 and causing local overheating, which affects the heat dissipation effect.

[0022] The outer rotor cylinder 5 is connected with a caliper brake 9. The caliper brake 9 is located between the outer rotor cylinder 5 and the rear end cover 52. The brake disc 91 of the caliper brake 9, the outer rotor cylinder 5 and the rear end cover 52 are connected together by fastening bolts. When the power supply fails and the driving roller cannot be powered, the driving roller can be manually and emergently braked by the caliper brake 9, which can not only avoid engineering accidents but also recover more economic losses. The caliper brake 9 is provided with a brake disc 91. Oppositely arranged calipers 92 are provided on both sides of the brake disc 91. Brake pads are provided on both sides of the brake disc 91 for the oppositely arranged calipers 92. The brake pads on both sides synchronously clamp the brake disc 91 to form a more balanced braking clamping force. Oppositely arranged calipers 92 are provided on both sides of the brake disc 91, increasing the effective contact area and pressure distribution between the brake pads and the brake disc 91, and significantly improving the braking force. Ceramic matrix composites are respectively coated on the contact surfaces of the oppositely arranged calipers 92 and the brake disc 91 to reduce the friction noise of metal hard points. The brake disc 91 is provided with a shaft hole adapted to the main shaft 1. The main shaft 1 and the brake disc 91 are connected by shaft hole fit. A bearing 93 is arranged in the shaft hole. The bearing 93 is sleeved on the outer periphery of the main shaft 1. The main shaft 1 is connected with the brake disc 91 through the bearing 93. The bearing 93 replaces the sliding friction between the main shaft 1 and the brake disc 91 through rolling elements, reducing the friction coefficient between the main shaft 1 and the brake disc 91, reducing energy consumption, and making the equipment start more smoothly. Due to the low friction power consumption, the heat dissipation requirement of the main shaft 1 is reduced.

[0023] Working principle: The outer spline 12 at the power input end of the main shaft 1 is fixedly connected with the motor to drive the rotation of the inner rotor 2. At the same time, the excitation coil 3 inside the driving roller is powered through the wire passing channel 11, so that the magnetorheological fluid 7 between the inner rotor assembly and the outer rotor assembly undergoes a curing reaction, thereby driving the rotation of the outer rotor cylinder 5. Adding the magnetorheological fluid 7 in the gaps among the inner rotor assembly, the outer rotor assembly and the heat dissipation pipe 6 can effectively reduce the magnetic resistance of the air gap and improve the magnetic induction intensity. Under the same structure, the magnetorheological fluid 7 will make the driving roller have a higher power density. The excitation coils 3 are independently controlled in multiple groups. When one group of excitation coils 3 fails due to power failure, the impact on the overall braking effect is small, and the driving roller has a high safety redundancy. At the same time, the magnetorheological fluid 7 in the gap undergoes a "solid-liquid" conversion under the action of the magnetic field, enabling the flexible drive and braking of the driving roller, reducing the impact and noise brought during the drive and braking of the outer rotor cylinder 5, and thus improving the stability of the device. A heat dissipation pipe 6 is installed between the inner rotor assembly and the outer rotor assembly, and the function of water-cooled heat dissipation is realized through the circulating flow of the condensed water in the heat dissipation pipe 6. By installing a caliper brake 9 on the outer rotor cylinder 5, in special cases such as power supply device failure, the caliper brake 9 can be manually activated to achieve emergency braking, avoiding greater engineering accidents and recovering more economic losses.

[0024] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and concept of the present invention, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. A safety redundant magnetorheological fluid driven roller with braking function, characterized in that: The invention comprises an inner rotor assembly and an outer rotor assembly, wherein the inner rotor assembly comprises a main shaft (1), the inner rotor (2) is sleeved on the outer surface of the main shaft (1), a plurality of excitation coils (3) are arranged circumferentially on the outer surface of the inner rotor (2), the plurality of excitation coils (3) are arranged in a circumferential array on the outer surface of the inner rotor (2), the plurality of excitation coils (3) located in the same circumferential direction are connected in series as a group, each group of excitation coils (3) is independently powered, the outer surface of the inner rotor (2) is sleeved with a silicon steel sheet (4), the excitation coil (3) is located between the inner rotor (2) and the silicon steel sheet (4); the outer rotor assembly comprises a rotor outer cylinder (5 ), a front end of the rotor outer cylinder (5) is connected to a front end cover (51), a rear end of the rotor outer cylinder (5) is connected to a rear end cover (52), a rotor magnet (53) is coaxially nested inside the rotor outer cylinder (5), a nylon strip (54) is provided inside the rotor magnet (53), a plurality of permanent magnets (8) and a plurality of magnetic conductive rings (81) are bonded to the inner surface of the nylon strip (54), the permanent magnets (8) and the magnetic conductive rings (81) are arranged at intervals, and a magnetic isolation ring (82) is bonded to the inner surface of the magnetic conductive ring (81); a gap between the nylon strip (54) and the silicon steel sheet (4) is filled with a magnetorheological fluid (7).

2. The safety redundant magnetorheological fluid drive roller with braking function according to claim 1, characterized in that: A plurality of spoke plates (21) are circumferentially arranged on the inner surface of the inner rotor (2), and the inner rotor (2) is connected to the main shaft (1) via the plurality of spoke plates (21).

3. The safety redundant magnetorheological fluid drive roller with braking function according to claim 2, characterized in that: A plurality of spokes (21) are connected to the main shaft (1) via a flat key.

4. The safety redundant magnetorheological fluid drive roller with braking function according to claim 1, characterized in that: The power input end of the main shaft (1) is provided with an external spline (12).

5. The safety redundant magnetorheological fluid drive roller with braking function according to claim 1, characterized in that: The main shaft (1) is provided with a wire passage (11), and an external power supply cable enters the driving roller through the wire passage (11) to supply power to the excitation coil (3).

6. The safety redundant magnetorheological fluid drive roller with braking function according to claim 1, characterized in that: A heat dissipation pipe (6) is provided between the inner rotor assembly and the outer rotor assembly.

7. The safety redundant magnetorheological fluid drive roller with braking function according to claim 6, characterized in that: The heat dissipation pipe (6) is an axial return bend pipe. The heat dissipation pipe (6) is circumferentially attached to the outer surface of the silicon steel sheet (4). The heat dissipation pipe (6) is provided with a liquid inlet pipe (61) and a liquid outlet pipe (62). The liquid inlet pipe (61) and the liquid outlet pipe (62) are located on the same side of the heat dissipation pipe (6) and are arranged opposite to each other. The liquid inlet pipe (61) is connected to the inner bend of the axial return bend pipe, and the liquid outlet pipe (62) is connected to the outer bend of the axial return bend pipe.

8. The safety redundant magnetorheological fluid drive roller with braking function according to claim 1, characterized in that: The rotor outer cylinder (5) is connected to a caliper brake (9), the caliper brake (9) is located between the rotor outer cylinder (5) and the rear end cover (52), and the caliper brake (9), the rotor outer cylinder (5) and the rear end cover (52) are connected together by fastening bolts.

9. The safety redundant magnetorheological fluid drive roller with braking function according to claim 8, characterized in that: The caliper brake (9) is provided with a brake disc (91), and opposed calipers (92) are provided on both sides of the brake disc (91) opposite to each other. The brake disc (91) is provided with an axial hole adapted to the main shaft (1), and the main shaft (1) and the brake disc (91) are connected by the axial hole.

10. The safety redundant magnetorheological fluid drive roller with braking function according to claim 9, characterized in that: A bearing (93) is arranged in the shaft hole. The bearing (93) is sleeved on the outer circumference of the main shaft (1). The main shaft (1) is connected to the brake disc (91) through the bearing (93).

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