A permanent magnet eddy current governor speed regulating mechanism for constant torque load

Abstract

The application belongs to the technical field of permanent magnet eddy current transmission speed regulation, and particularly relates to a permanent magnet eddy current speed regulator speed regulation mechanism for constant torque load; the speed regulation mechanism comprises an outer cylinder, a permanent magnet disc, a transmission shaft and a speed regulation control mechanism; the outer cylinder is used for being connected with an input shaft, a plurality of conductor cylinders are inlaid in the outer cylinder; the front end of the transmission shaft passes through the center of the conductor cylinders, and the rear end of the transmission shaft is used for being connected with a load shaft; the permanent magnet disc is installed on the transmission shaft and can move axially on the transmission shaft from a starting section to a stable running section and rotate circumferentially synchronously with the transmission shaft; the speed regulation control mechanism realizes axial movement of the permanent magnet disc through trapezoidal threads and realizes guiding through spline connection; the application provides a permanent magnet eddy current speed regulator speed regulation structure for constant torque load, which can control transmission characteristics by mechanical method, shorten axial length and enable the speed regulation structure to be used for soft starting, speed regulation running and overload protection of constant torque load in a coal mine.

Description

Technical Field

[0001] This invention belongs to the field of permanent magnet eddy current drive speed regulation technology, specifically relating to a speed regulation mechanism for a permanent magnet eddy current speed regulator for constant torque loads. Background Technology

[0002] Commonly used continuous conveying equipment in underground coal mines includes belt conveyors and scraper conveyors. These devices are all constant torque loads and need to meet the following requirements: heavy-duty controllable soft start, speed-regulating operation, multi-machine drive power balance, and overload protection; adaptability to the confined spaces and harsh working environments of underground coal mines, including dust and humidity. Currently, commonly used drive speed control technologies for conveyors include speed-regulating hydraulic couplings, CST controllable drive devices, variable frequency motors, and permanent magnet variable frequency synchronous motors. Each of these technologies has its own drawbacks.

[0003] Permanent magnet eddy current speed controllers are a new speed control technology that has emerged in recent years. They offer several advantages: the load and motor are not directly connected, reducing mechanical shock during equipment startup and operation. However, their characteristics are only suitable for applications such as fans and pumps. When applied to constant torque loads, they have the following drawbacks: ① Low starting torque, allowing only light loads to be started directly; ② Narrow speed range, with a limited adjustable range, only adjustable between the rated speed and the overturning point speed; ③ Incomplete unloading during overload protection, leading to overheating, and excessively high temperatures can even cause demagnetization of the permanent magnets.

[0004] Regarding permanent magnet eddy current speed regulation technology for constant torque loads, Chinese invention patent application No. 202210463248.6 discloses "a permanent magnet eddy current speed regulator and its control method for constant torque loads." This method uses a layered and segmented conductor tube of the cylindrical permanent magnet eddy current speed regulator to achieve a gradually varying impedance, thereby adjusting the transmission characteristics of the speed regulator and enabling it to regulate the speed of constant torque loads. However, the axial length of the speed regulator structure proposed in this patent is too long, making it difficult to apply in underground coal mines. Therefore, researching a practical permanent magnet eddy current speed regulator structure to enable its practical engineering application for constant torque loads is of great significance. Summary of the Invention

[0005] The purpose of this invention is to enable the permanent magnet eddy current speed regulator to simultaneously meet the requirements of heavy-load start-up, speed regulation operation and overload protection for constant torque loads in underground coal mines, and to solve the problem of excessive axial length of permanent magnet eddy current speed regulator equipment.

[0006] The present invention provides the following technical solution: a speed regulating mechanism for a permanent magnet eddy current speed regulator for a constant torque load, comprising an outer cylinder, a permanent magnet disk, a transmission shaft, and a speed regulating control mechanism;

[0007] The outer cylinder is used to connect to the input shaft. Several conductor cylinders are embedded inside the outer cylinder. The conductor cylinders are arranged in the following order: starting section, speed regulation section, and stable operation section. The impedance of the conductor cylinder gradually decreases from the starting section to the stable operation section.

[0008] The front end of the drive shaft passes through the center of several conductor cylinders, and the rear end of the drive shaft is used to connect to the load shaft.

[0009] The permanent magnet disk is mounted on the drive shaft and can move axially on the drive shaft from the starting section to the stable operation section and rotate circumferentially synchronously with the drive shaft. The permanent magnet disk is radially magnetized and the N poles and S poles are alternately arranged along the circumferential direction.

[0010] The speed control mechanism includes an external moving mechanism and an internal stationary mechanism. The internal stationary mechanism includes an isolation sleeve mounted on the drive shaft, which is axially stationary and circumferentially free relative to the drive shaft. The external moving mechanism includes a thrust sleeve and a threaded sleeve. The threaded sleeve is mounted on an outer cylinder, which is axially stationary and circumferentially free relative to the outer cylinder. The thrust sleeve is non-contactly sleeved on the drive shaft. The front end of the thrust sleeve makes rolling contact with the permanent magnet disk and can transmit axial thrust. The inner wall of the rear end of the thrust sleeve makes sliding contact with the isolation sleeve and is circumferentially stationary. The outer wall of the rear end engages with the threaded sleeve. The threaded sleeve is connected to the torque input component.

[0011] Furthermore, the isolation sleeve is a spline isolation sleeve, with the outer wall of the front end of the spline isolation sleeve being splined, and the rear end of the spline isolation sleeve being supported on the drive shaft by a support bearing, and the rear end of the spline isolation sleeve supporting an external moving mechanism;

[0012] The thrust sleeve is a thrust bearing sleeve, the threaded sleeve is a trapezoidal threaded sleeve, and the external moving mechanism also includes a thrust bearing, several isolation bearings, a movable rotating sleeve, and a first ear-shaped connector;

[0013] The thrust bearing is installed between the thrust bearing sleeve and the permanent magnet disk and is axially limited. The outer wall of the thrust bearing sleeve has a trapezoidal thread, which can mesh with the trapezoidal thread on the inner wall of the trapezoidal threaded sleeve. The inner wall of the thrust bearing sleeve has a spline, which can mesh with the outer wall of the splined isolation sleeve. Several isolation bearings are installed between the trapezoidal threaded sleeve and the outer cylinder. One end of the movable rotating sleeve is fixedly connected to the trapezoidal threaded sleeve, and the other end is rotatably supported on the splined isolation sleeve. The first ear-shaped connector is bolted to the movable rotating sleeve.

[0014] Furthermore, the inner ring of the thrust bearing is fixed by the protrusion at the front edge of the thrust bearing sleeve and the bearing retaining ring, and the outer ring of the thrust bearing is embedded in the groove of the permanent magnet disk;

[0015] The isolation bearing includes a third isolation bearing, a fourth isolation bearing, and a fifth isolation bearing. The fourth isolation bearing is limited to the front end of the trapezoidal threaded sleeve by the shoulder protrusion on the outer wall of the front end of the trapezoidal threaded sleeve and the bearing retaining ring. The third isolation bearing and the fifth isolation bearing are respectively installed at the front end and the rear end of the fourth isolation bearing.

[0016] Furthermore, the characteristic is that the drive shaft includes a front support section, a middle spline shaft section, and a rear support connection section. The support section of the drive shaft is supported on the outer cylinder by bearings, the permanent magnet disk is supported on the spline shaft section of the drive shaft, the permanent magnet disk is connected to the drive shaft by splines, and the rear end face of the drive shaft is connected to the load shaft by an output coupling.

[0017] Furthermore, the outer cylinder is composed of the front end face of the outer cylinder, the main body of the outer cylinder, and the rear end face of the outer cylinder;

[0018] The front end face of the outer cylinder includes an input half coupling, an input connecting cover, a first flange, a first support, a second annular threaded hole component, and a first bearing end cover. The front end of the input half coupling is used to connect to the input shaft. The input connecting cover is connected to the first flange by bolts. The input half coupling and the input connecting cover are connected by bolts. The second annular threaded hole component is welded to the first support. The second annular threaded hole component and the first flange are connected together by bolts. The first bearing end cover is connected to the first support by screws.

[0019] The outer cylinder body includes threaded fasteners, a first screw, a yoke cylinder, a fastening ring, a starting section conductor cylinder, a first speed regulating section conductor cylinder, a second speed regulating section conductor cylinder, and a stable operation section conductor cylinder. The starting section conductor cylinder, the first speed regulating section conductor cylinder, the second speed regulating section conductor cylinder, and the stable operation section conductor cylinder are fastened to the inner wall of the yoke cylinder with bolts. The rear ends of the four conductor cylinders are against the shoulder of the yoke cylinder, and fastening rings are installed at the front ends of the four conductor cylinders. The threaded fasteners are welded to the outer wall of the yoke cylinder. The first screw is screwed into the threaded holes on the threaded fasteners and the yoke cylinder, and cooperates with the wedge-shaped surface of the fastening ring to push the fastening ring to squeeze the conductor cylinders so that they are arranged tightly.

[0020] The rear end face of the outer cylinder includes a second flange, a first annular threaded hole component, a second support component, and a second bearing end cap; the first annular threaded hole component is welded to the second support component, the first annular threaded hole component and the second flange are connected together by bolts, and the second bearing end cap and the second support component are connected together by screws;

[0021] The front end face of the outer cylinder, the main body of the outer cylinder, and the rear end face of the outer cylinder are connected together by bolts, washers, and nuts.

[0022] Furthermore, the permanent magnet disk includes a permanent magnet, a yoke disk, and a double-layer annular sleeve. The permanent magnet is circumferentially embedded in the outer periphery of the yoke disk. The yoke disk is connected to the outer ring of the double-layer annular sleeve by bolts and supported on the thrust bearing sleeve by a thrust bearing. The double-layer annular sleeve is connected to the splined shaft section of the drive shaft by splines.

[0023] Furthermore, the support section of the drive shaft is supported on the front end face of the outer cylinder by a first isolation bearing and a second isolation bearing. The first isolation bearing is limited to the support section of the drive shaft by a shaft shoulder, a round nut and a locking washer.

[0024] Compared with the prior art, the advantages of the present invention are:

[0025] This invention provides a speed regulation structure for a permanent magnet eddy current speed controller for constant torque loads. It achieves mechanical control of its transmission characteristics, shortens its axial length, and enables its application in soft starting, speed regulation, and overload protection for constant torque loads in underground coal mines. A trapezoidal thread is used to convert the rotary motion of the speed control mechanism into the linear motion of the permanent magnet disk. By segmenting the conductor cylinder, different positions of the conductor cylinder have different circuit impedances, achieving the following objectives: ① Heavy-load starting of the motor is achieved by utilizing the change in conductor cylinder circuit impedance from the starting section to the speed regulation section; ② Speed ​​regulation, power balance, and overload protection for constant torque loads are achieved using the speed regulation section conductor cylinder; ③ Smooth operation of constant torque loads is achieved using the stable operation section conductor cylinder; ④ Achieves axial linear motion of the magnet disk without linear displacement of the speed control mechanism, thereby realizing a gradual change in the circuit impedance of the permanent magnet disk corresponding to the conductor cylinder. Compared with conventional permanent magnet eddy current speed regulation mechanisms, the axial length is shortened, facilitating practical applications. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention.

[0027] In the diagram: 1. Input connecting sleeve, 2. First isolation bearing, 3. First support member, 4. Second isolation bearing, 5. First flange, 6. Double-layer annular sleeve, 7. Threaded fastener, 8. First screw, 9. Fastening ring, 10. Permanent magnet, 11. Thrust bearing, 12. Thrust bearing sleeve, 13. Second flange, 14. First annular threaded hole member, 15. Spline isolation sleeve, 16. Trapezoidal threaded sleeve, 17. Second screw, 18. First tufted connector, 19. Movable rotating sleeve, 20. Second tufted connector, 21. ... 22. Support bearing, 23. Input half coupling, 24. First bearing end cover, 25. Round nut, 26. Locking washer, 27. Second annular threaded hole component, 28. Yoke cylinder, 29. Starting section conductor cylinder, 30. Yoke disc, 31. First speed regulating section conductor cylinder, 32. Second speed regulating section conductor cylinder, 33. Stable operation section conductor cylinder, 34. Second support component, 35. Third isolation bearing, 36. Fourth isolation bearing, 37. Second bearing end cover, 38. Fifth isolation bearing, 39. Drive shaft, 40. Output coupling. Detailed Implementation

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] like Figure 1 As shown: This embodiment provides a speed regulation structure for a permanent magnet eddy current speed regulator for constant torque loads, including an outer cylinder, a permanent magnet disk, a transmission shaft 39, and a speed regulation control mechanism.

[0030] The outer cylinder includes a front end face, a main body, and a rear end face. The front end face is connected to a separate motor input shaft via an input half-coupling 23 and an input connecting cover 1. The rear end of the input connecting cover 1 is bolted to a first flange 5. A first support member 3 is provided inside the input connecting cover 1, and a second annular threaded hole member 27 is welded to the outer circumference of the first support member 3. The first support member 3 and the second annular threaded hole member 27 are fixed to the first flange 5 with bolts. The main body of the outer cylinder is connected and fixed to the front end face with bolts, and four sections of conductor cylinders are bolted to the inner wall of the yoke cylinder 28. The conductor cylinders are respectively the starting section conductor cylinder 29, the first speed regulating section conductor cylinder 31, the second speed regulating section conductor cylinder 32, and the stable operation section conductor cylinder 33. The impedance of the conductor cylinders gradually decreases from the starting section to the stable operation section. The front end of the four conductor cylinders is equipped with fastening rings 9. Under the pressure of the first screw 8, the fastening rings 9 squeeze the conductor cylinders to make them closely arranged and ensure good contact. The rear end face of the outer cylinder is connected and fixed to the outer cylinder body by bolts. The second support member 34 has a first annular threaded hole member 14 welded on its outer periphery. The second support member 34 and the first annular threaded hole member 14 are fixed to the second flange 13 by bolts.

[0031] The permanent magnet disk is mounted on the spline section of the drive shaft 39 via a spline connection. The torque on the permanent magnet disk is transmitted to the drive shaft 39 through the spline connection between the double-layer annular sleeve 6 and the spline section of the drive shaft 39. When the speed control mechanism is activated, the permanent magnet disk can move linearly along the drive shaft. At this time, the spline at the spline section of the drive shaft 39 plays a guiding role. The outer ring of the double-layer annular sleeve 6 is connected to the yoke disk 30 with bolts. The permanent magnet 10 is fixed to the outer periphery of the yoke disk 30 with bolts.

[0032] The speed control mechanism includes an external moving mechanism and an internal stationary mechanism. The external moving mechanism is used to drive the permanent magnet disk to move linearly within the area covered by the conductor cylinder. The thrust bearing 11 is fixed between the permanent magnet disk and the thrust bearing sleeve 12 by a limit ring to ensure that the speed control mechanism does not rotate with the permanent magnet disk. The external moving mechanism can convert the rotational motion of the first ear-shaped connector 18 into the linear motion of the thrust bearing sleeve 12 through the trapezoidal thread. The thrust bearing 11 transmits the force to the permanent magnet disk to achieve linear movement of the permanent magnet disk. At the same time, the third isolation bearing 35, the fourth isolation bearing 36, and the fifth isolation bearing 38 can isolate the movement of the outer cylinder and achieve axial force balance through the fourth isolation bearing 36.

[0033] The internal stationary mechanism isolates the external moving mechanism from the drive shaft 39 and supports the external moving mechanism. The spline isolation sleeve 15 is supported by the support bearing 22 and has a gap with the drive shaft 39. The second ear-shaped connector 20 and the third flange 21 are fixed to the end of the spline isolation sleeve 15 by bolts and screws, respectively. The external control guide rod can keep the internal stationary mechanism stationary by controlling the second ear-shaped connector 20 to remain stationary.

[0034] The front end of the drive shaft 39 is supported inside the front end face of the outer cylinder by the first isolation bearing 2 and the second isolation bearing 4. The axial position of the first isolation bearing 2 is limited by the round nut 25 and the locking washer 26. The first bearing end cover 24 closes the front end of the drive shaft 39. The rear end of the drive shaft 39 is connected to the output end coupling 40. The permanent magnet disk drives the drive shaft 39 and thus drives the load to rotate.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention 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 or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention. This speed regulating mechanism can be used not only in cylindrical permanent magnet eddy current speed regulators, but also in mechanical equipment that works by adjusting axial distance, including disc-type permanent magnet eddy current speed regulators.

Claims

1. A speed regulating mechanism for a permanent magnet eddy current speed controller for a constant torque load, comprising an outer cylinder, a permanent magnet disk, a transmission shaft (39), and a speed control mechanism; characterized in that: The outer cylinder is used to connect to the input shaft. Several conductor cylinders are embedded inside the outer cylinder. The conductor cylinders are arranged in the following order: starting section, speed regulation section, and stable operation section. The impedance of the conductor cylinder gradually decreases from the starting section to the stable operation section. The front end of the drive shaft (39) passes through the center of several conductor cylinders, and the rear end of the drive shaft (39) is used to connect to the load shaft; The permanent magnet disk is mounted on the drive shaft (39) and can move axially from the starting section to the stable operation section on the drive shaft (39) and rotate circumferentially synchronously with the drive shaft (39). The permanent magnet disk is radially magnetized and the N pole and S pole are alternately arranged along the circumferential direction. The speed control mechanism includes an external moving mechanism and an internal stationary mechanism. The internal stationary mechanism includes an isolation sleeve, which is mounted on the drive shaft (39) and is axially stationary and circumferentially free relative to the drive shaft (39). The external moving mechanism includes a thrust sleeve and a threaded sleeve. The threaded sleeve is mounted on the outer cylinder and is axially stationary and circumferentially free relative to the outer cylinder. The thrust sleeve is non-contactly sleeved on the drive shaft (39). The front end of the thrust sleeve is in rolling contact with the permanent magnet disk and can transmit axial thrust. The inner wall of the rear end of the thrust sleeve is in sliding contact with the isolation sleeve and is circumferentially stationary. The outer wall of the rear end is threadedly engaged with the threaded sleeve. The threaded sleeve is connected to the torque input component. The isolation sleeve is a spline isolation sleeve (15). The outer wall of the front end of the spline isolation sleeve (15) is spline-shaped, and the rear end of the spline isolation sleeve (15) is supported on the drive shaft (39) by a support bearing (22). The rear end of the spline isolation sleeve (15) supports an external moving mechanism. The thrust sleeve is a thrust bearing sleeve (12), the threaded sleeve is a trapezoidal threaded sleeve (16), and the external moving mechanism also includes a thrust bearing (11), several isolation bearings, a movable rotating sleeve (19), and a first ear-shaped connector (18). The thrust bearing (11) is installed between the thrust bearing sleeve (12) and the permanent magnet disk and is axially limited. The outer wall of the thrust bearing sleeve (12) has a trapezoidal thread, which can mesh with the trapezoidal thread on the inner wall of the trapezoidal thread sleeve (16). The inner wall of the thrust bearing sleeve (12) has a spline, which can mesh with the outer wall of the spline isolation sleeve (15). Several isolation bearings are installed between the trapezoidal thread sleeve (16) and the outer cylinder. One end of the movable rotating sleeve (19) is fixedly connected to the trapezoidal thread sleeve (16), and the other end is rotatably supported on the spline isolation sleeve (15). The first ear-shaped connector (18) is bolted to the movable rotating sleeve (19).

2. The speed regulating mechanism for a permanent magnet eddy current speed controller for a constant torque load according to claim 1, characterized in that: The inner ring of the thrust bearing (11) is fixed by the front edge protrusion of the thrust bearing sleeve (12) and the bearing retaining ring, and the outer ring of the thrust bearing (11) is embedded in the groove of the permanent magnet disk. The isolation bearings include a third isolation bearing (35), a fourth isolation bearing (36), and a fifth isolation bearing (38). The fourth isolation bearing (36) is limited to the front end of the trapezoidal threaded sleeve (16) by the shoulder protrusion on the outer wall of the front end of the sleeve (16) and the bearing retaining ring. The third isolation bearing (35) and the fifth isolation bearing (38) are respectively installed at the front end and the rear end of the fourth isolation bearing (36).

3. A speed regulating mechanism for a permanent magnet eddy current speed controller for a constant torque load according to claim 1 or 2, characterized in that: The drive shaft (39) includes a front support section, a middle spline shaft section, and a rear support connection section. The support section of the drive shaft (39) is supported on the outer cylinder by bearings. The permanent magnet disk is supported on the spline shaft section of the drive shaft (39). The permanent magnet disk is connected to the drive shaft (39) by splines. The rear end face of the drive shaft (39) is connected to the load shaft by an output coupling (40).

4. The speed regulating mechanism for a permanent magnet eddy current speed controller for a constant torque load according to claim 3, characterized in that: The outer cylinder is composed of a front end face, a main body, and a rear end face. The front end face of the outer cylinder includes an input half coupling (23), an input connecting cover (1), a first flange (5), a first support (3), a second annular threaded hole part (27), and a first bearing end cover (24). The front end of the input half coupling (23) is used to connect the input shaft. The input connecting cover (1) is connected to the first flange (5) by bolts. The input half coupling (23) and the input connecting cover (1) are connected by bolts. The second annular threaded hole part (27) is welded to the first support (3). The second annular threaded hole part (27) and the first flange (5) are connected together by bolts. The first bearing end cover (24) is connected to the first support (3) by screws. The outer cylinder body includes a threaded fastener (7), a first screw (8), a yoke cylinder (28), a fastening ring (9), a starting section conductor cylinder (29), a first speed regulating section conductor cylinder (31), a second speed regulating section conductor cylinder (32), and a stable operation section conductor cylinder (33). The starting section conductor cylinder (29), the first speed regulating section conductor cylinder (31), the second speed regulating section conductor cylinder (32), and the stable operation section conductor cylinder (33) are fastened to the inner wall of the yoke cylinder (28) with bolts. The rear ends of the four conductor cylinders are backed against the shoulder of the yoke cylinder (28), and the fastening ring (9) is installed at the front end of the four conductor cylinders. The threaded fastener (7) is welded to the outer wall of the yoke cylinder (28). The first screw (8) is screwed into the threaded hole on the threaded fastener (7) and the yoke cylinder (28), and cooperates with the wedge-shaped surface of the fastening ring (9) to push the fastening ring (9) to squeeze the conductor cylinders so that they are arranged tightly. The rear end face of the outer cylinder includes a second flange (13), a first annular threaded hole component (14), a second support component (34), and a second bearing end cap (37); the first annular threaded hole component (14) is welded to the second support component (34), the first annular threaded hole component (14) and the second flange (13) are connected together by bolts, and the second bearing end cap (37) and the second support component (34) are connected together by screws; The front end face of the outer cylinder, the main body of the outer cylinder, and the rear end face of the outer cylinder are connected together by bolts, washers, and nuts.

5. The speed regulating mechanism for a permanent magnet eddy current speed controller for a constant torque load according to claim 3, characterized in that: The permanent magnet disk includes a permanent magnet (10), a yoke disk (30), and a double-layer annular sleeve (6). The permanent magnet (10) is circumferentially embedded on the outer periphery of the yoke disk (30). The yoke disk (30) is connected to the outer ring of the double-layer annular sleeve (6) by bolts and supported on the thrust bearing sleeve (12) by the thrust bearing (11). The double-layer annular sleeve (6) is connected to the spline shaft section of the transmission shaft (39) by splines.

6. The speed regulating mechanism for a permanent magnet eddy current speed controller for a constant torque load according to claim 3, characterized in that: The support section of the drive shaft (39) is supported on the front end face of the outer cylinder by a first isolation bearing (2) and a second isolation bearing (4). The first isolation bearing (2) is limited to the support section of the drive shaft by a shoulder, a round nut (25) and a locking washer (26).

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