A reduction motor provided with a magnetic coupling protection device

Abstract

The present invention provides a reduction motor provided with a magnetic coupling protection device, which belongs to the technical field of reduction mechanisms. The magnetic coupling protection device of the present invention is a torque-limiting magnetic coupling pair, which is arranged between the motor and the reducer, and the magnetic coupling pair includes an inner magnetic steel and an outer magnetic steel, the inner magnetic steel is arranged on the motor output shaft through a carrier sleeve, and the outer magnetic steel is connected to the flange shaft through a carrier, and an input gear is installed on the flange shaft, and the input gear is meshed with the reducer gear; the torque-limiting magnetic coupling pair is arranged in a transition sleeve, and the transition sleeve is fixed between the motor and the reducer. The torque-limiting magnetic coupling pair of the present invention can effectively avoid the occurrence of broken teeth of the reducer gear or damage to the gear box body when the reducer end is overloaded or subjected to an impact load, and significantly improves the service life of the reduction motor.

Description

Technical Field

[0001] The invention belongs to the technical field of speed reduction mechanisms, and in particular relates to a speed reduction motor provided with a magnetic coupling protection device. Background Art

[0002] A reduction motor refers to an integration of a reducer and an electric motor (motor), also known as a gear motor or gear motor. It is widely used in the reduction transmission mechanism of various general mechanical equipment such as metallurgy, mining, lifting, transportation, cement, construction, chemical industry, textile, printing and dyeing, pharmaceuticals, medical treatment, beauty, health massage, office supplies, etc. Its advantages are simplified design, space saving, low energy consumption, and a reducer efficiency of more than 95%.

[0003] The reduction motor for roller table is a special reduction motor composed of a variable frequency motor and a planetary reducer. It can work continuously or intermittently in harsh working conditions such as heavy load, frequent starting and braking, forward and reverse rotation, reverse braking, impact load, high temperature, and dust. It has a large speed regulation range and high overload capacity, as well as high mechanical strength. It is a variable frequency reduction motor specially used for roller tables in the metallurgical industry.

[0004] The existing technology of roller conveyor reduction motor has a high annual damage rate, which is mainly concentrated in the wear of low-speed end gears, broken teeth and cracking of gear box body. The main causes of such problems are overload and impact load; and the electrical protection of the motor has a delay, which cannot protect the reducer in the first time when overload and impact load occur. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a reduction motor provided with a magnetic coupling protection device, which effectively prevents damage to the gear box body and gears.

[0006] The present invention achieves the above technical objectives through the following technical means.

[0007] A reduction motor provided with a magnetic coupling protection device comprises a motor, a reduction gear and an input gear, and also comprises a torque-limiting magnetic coupling pair built between the motor and the reduction gear, the torque-limiting magnetic coupling pair comprising an inner magnetic steel and an outer magnetic steel, the outer magnetic steel is sleeved on the outside of the inner magnetic steel, and an air gap is left between the two; the inner magnetic steel is sleeved on the output shaft of the motor through an inner magnetic steel carrier, the outer magnetic steel is connected to the flange shaft through one end of the outer magnetic steel carrier, the input gear is installed on the flange shaft, and the input gear is meshed with the reduction gear gear.

[0008] The above technical solution also includes a bearing and a transition sleeve built between the motor and the reducer. The outside of the external magnetic steel carrier is connected to the bearing, the bearing is connected to the external transition sleeve, and the transition sleeve is fixed between the motor and the reducer; the input gear, bearing, flange shaft, external magnetic steel carrier, external magnetic steel and transition sleeve rotate around the axis; an internal magnetic steel adjustment sleeve is provided between the inner magnetic steel and the inner magnetic steel carrier, and adjustment mechanisms are provided at both ends of the inner magnetic steel carrier along the axial direction.

[0009] Furthermore, support ribs are provided on the inner side of the transition sleeve, and the support ribs are connected to the bearing mounting sleeve, and the bearing is connected inside the bearing mounting sleeve.

[0010] Furthermore, the adjustment mechanism adopts a screw.

[0011] In the above technical solution, the other end of the outer magnetic steel carrier is connected to the end cover, and bearings are provided at both ends of the inner magnetic steel carrier, and the outside of the bearings are respectively connected to the flange shaft and the end cover.

[0012] Furthermore, a transition sleeve fixed between the motor and the reduction box is provided on the outer side of the magnetic coupling pair.

[0013] In the above technical solution, the outer magnetic steel or the inner magnetic steel can be replaced with a conductive material.

[0014] Furthermore, the bearing is axially positioned.

[0015] The beneficial effects of the present invention are:

[0016] (1) The present invention sets a torque-limiting magnetic coupling pair between the motor and the reducer. When the reducer end is overloaded, the overload slipping characteristics of the magnetic coupling are used to avoid the occurrence of reducer gear tooth breakage or gear box damage caused by the slow reaction of the motor electrical protection, effectively protecting the reduction motor and avoiding damage to the internal structure of the reducer such as gears and gear shafts due to overload; when the reducer end is subjected to impact load, the magnetic coupling buffering effect is used to effectively absorb the impact of gear meshing and reduce the impact on the gear box. The present invention can significantly improve the service life of the reduction motor.

[0017] (2) When the reducer end is overloaded, the present invention can also utilize the overload slip protection function of the torque-limiting magnetic coupling pair to stop the rotation of the outer components of the reduction box, input gear, and magnetic coupling pair, while the inner components of the torque-limiting magnetic coupling pair and the motor output shaft continue to rotate, thereby avoiding shutdown of the production line due to overload of the reducer end, reducing maintenance costs, and improving production efficiency.

[0018] (3) The inner magnetic steel of the present invention can change its relative position with the outer magnetic steel under the action of the adjustment mechanism, thereby adjusting the magnitude of the torque transmitted by the magnetic coupling pair by adjusting the magnetic coupling area.

[0019] (4) During actual use of the permanent magnet coupling protection device of the present invention, the motor end and the reducer end operate synchronously without a speed difference; the outer magnetic steel or the inner magnetic steel in the present invention can be replaced with a conductive material so that the motor end and the reducer end operate asynchronously to meet the needs of different occasions.

[0020] (5) The weight of the permanent magnet coupling protection device of the present invention is concentrated on the outer transition sleeve, and has little impact on the motor shaft.

[0021] (6) The present invention can be modified on site on the original reduction motor, can be quickly installed, has a modular design, and does not require the reduction motor to be moved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the existing reducer structure layout;

[0023] Figure 2 This is a schematic diagram of the structure of a reduction motor according to Embodiment 1 of the present invention;

[0024] Figure 3 Schematic diagram of the magnetic coupling substructure of Example 1 of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of a reduction motor according to Embodiment 2 of the present invention;

[0026] Figure 5 Schematic diagram of the magnetic coupling substructure of Example 2 of the present invention;

[0027] Figure 6 This is a schematic diagram of the structure of a reduction motor according to Embodiment 3 of the present invention;

[0028] Figure 7 Schematic diagram of the magnetic coupling substructure of Example 3 of the present invention;

[0029] In the figure: 1-motor, 2-reduction gearbox, 3-input gear, 4-bearing, 5-torque-limiting magnetic coupling pair, 6-transition sleeve, 51-flange shaft, 52-external magnetic steel carrier, 53-external magnetic steel, 54-inner magnetic steel, 55-inner magnetic steel adjusting sleeve, 56-adjusting mechanism 1, 57-inner magnetic steel carrier, 58-adjusting mechanism 2, 59-end cover, 7-bearing mounting sleeve. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

[0031] like Figure 1As shown, the reduction motor (motor) in the prior art includes a motor 1, a reduction box 2 and an input gear 3. The motor 1 and the reduction box 2 are connected and assembled by end face positioning stoppers and bolts. The input gear 3 installed on the motor output shaft meshes with the internal gear of the reduction box 2 to transmit power. This structural arrangement is that the motor is directly connected to the reducer, and the protection of the reduction box depends entirely on the protection of the motor. The electrical protection of the motor has the problems of delay and low protection accuracy, so the inside of the reduction box has been damaged before the motor protection is started.

[0032] Example 1

[0033] like Figure 2 As shown, the reduction motor of this embodiment adds a transition sleeve 6 in the prior art, and the transition sleeve 6 is fixed between the motor 1 and the reduction box 2 by bolts. The transition sleeve 6 is provided with a torque-limiting magnetic coupling pair 5 and a bearing 4 inside. The bearing 4 is arranged on the outer circumference of the torque-limiting magnetic coupling pair 5, and the outer circumference of the bearing 4 is connected to the transition sleeve 6. The torque-limiting magnetic coupling pair 5 rotates around the bearing 4 in the transition sleeve 6 and the magnetically coupled outer rotor is axially fixed. The bearing 4 needs to be reliably positioned axially, specifically: the outer ring of the bearing 4 is positioned by the inner side of the transition sleeve 4 in a step shape, the inner ring of the bearing 4 near the flange shaft 51 is positioned by the flange shaft 51, and the inner ring of the bearing 4 near the motor 1 is positioned by the shaft elastic retaining ring, thereby eliminating the axial force of the gear transmission belt.

[0034] like Figure 3 As shown, the torque-limiting magnetic coupling pair 5 includes an inner component and an outer component; the outer component includes an outer magnetic steel carrier 52 and an outer magnetic steel 53, the outer circumference of the outer magnetic steel carrier 52 is connected to the bearing 4, the outer magnetic steel carrier 52 is provided with an outer magnetic steel 53, and the outer magnetic steel carrier 52 is connected to the flange shaft 51 at one end close to the reduction box 2; the inner component includes an inner magnetic steel 54, an inner magnetic steel adjusting sleeve 55 and an inner magnetic steel carrier 57 which are arranged in sequence from the outside to the inside, the outer circumference of the inner magnetic steel adjusting sleeve 55 is provided with an inner magnetic steel 54, and the inner magnetic steel adjusting sleeve 55 is provided with an inner magnetic steel 54. The inner hole is arranged on the outer circumference of the inner magnetic steel carrier 57, and the inner magnetic steel carrier 57 is sleeved on the output shaft of the motor 1; the left and right ends of the inner magnetic steel carrier 57 are respectively provided with an adjustment mechanism 1 56 and an adjustment mechanism 2 58, and the adjustment mechanism 1 56 and the adjustment mechanism 2 58 are specifically screws arranged along the axial direction, and cooperate with the threaded holes reserved on the inner magnetic steel carrier 57. According to actual needs, the screws can be used to adjust the relative position of the inner magnetic steel 54 and the outer magnetic steel 53, and the magnitude of the torque transmitted by the torque-limiting magnetic coupling pair 5 can be adjusted by adjusting the magnetic coupling area. The outer magnetic steel 53 is sleeved on the outside of the inner magnetic steel 54, and an air gap is left between the outer magnetic steel 53 and the inner magnetic steel 54. The outer magnetic steel carrier 52 and the inner magnetic steel carrier 57 are specifically rings made of 45# steel.

[0035] The structural dimensions of the flange shaft 51 are consistent with those of the output shaft of the motor 1. During on-site modification, the input gear 3 on the output shaft of the motor 1 can be directly installed on the flange shaft 51 without changing the original internal connection form between the motor 1 and the reduction gearbox 2. From the appearance point of view, only the length dimension of a transition sleeve 6 is increased.

[0036] During installation, first install the bearing 4, the torque-limiting magnetic coupling pair 5, and the transition sleeve 6, and transport them to the site as the modified body. After disassembling the reduction motor on site, first remove the input gear 3 on the output shaft of the motor 1 and install it on the flange shaft 51, then separate the inner and outer components of the torque-limiting magnetic coupling pair 5, and install the inner component with the output shaft of the motor 1 as a whole. The outer component is first installed with the reduction box 2 through the transition sleeve 6 to form another whole. Finally, the transition sleeve 6 is connected to the motor 1, and the two wholes are combined into one. Re-inject lubricating oil through the oil filling port of the reduction box 2 to complete the installation. The steps are simple and the installation speed is fast, which fully reflects the advantages of modular design.

[0037] In actual operation, when the output shaft of motor 1 rotates, the transmission principle of the torque-limiting magnetic coupling pair 5 is used, and the inner and outer components rotate simultaneously, and the output shaft of reduction box 2 is driven by input gear 3, so as to realize the transmission mode of the original reduction motor. When the load end of reduction box 2 is overloaded, the overload slip protection function of magnetic coupling pair 5 is used, and the outer components of reduction box 2, input gear 3, and torque-limiting magnetic coupling pair 5 stop rotating, while the inner components of torque-limiting magnetic coupling pair 5 and the output shaft of motor 1 continue to work. After that, the signal of stopping working can be fed back through a detection device somewhere at the load end, so that motor 1 stops working, thus playing a protective role. The cavity between the original motor 1 and reduction box 2 is filled with lubricating oil, about 1 / 3 of the height, so the transition sleeve 6 is designed as a completely sealed structure. After the equipment modification and installation is completed, about lubricating oil is re-injected through the oil filling port of reduction box 2 to meet the lubrication requirements. Bearing 4 mainly plays a supporting and stabilizing role. Its size is much larger than the inner bearing of the motor shaft, which fully meets the use requirements.

[0038] Example 2

[0039] like Figure 4 , 5 As shown, this embodiment adds a bearing mounting sleeve 7 on the basis of embodiment 1, and a support rib is provided on the inner side of the transition sleeve 6; in this embodiment, the outer circumference of the bearing 4 is connected to the bearing mounting sleeve 7, and the bearing mounting sleeve 7 is connected to the support rib of the transition sleeve 6 through a stop and a screw, which is used to realize the installation guide of the torque-limiting magnetic coupling pair 5, and the torque-limiting magnetic coupling pair 5 rotates inside the bearing mounting sleeve 7 around the center of the bearing 4; in this embodiment, the torque-limiting magnetic coupling pair 5 and the transition sleeve 6 are divided into two parts, which reduces the difficulty of bearing installation during the installation process.

[0040] The bearing 4 in this embodiment needs to be reliably positioned axially, specifically: the outer ring of the bearing 4 is positioned by being arranged in a step shape on the inner side of the bearing mounting sleeve 7, the inner ring of the bearing 4 near the flange shaft 51 is positioned by the flange shaft 51, and the inner ring of the bearing 4 near the motor 1 is positioned by an elastic retaining ring for the shaft, thereby eliminating the axial force of the gear transmission belt.

[0041] Example 3

[0042] like Figure 6 , 7 As shown, the outer component of the torque-limiting magnetic coupling pair 5 of this embodiment includes an outer magnetic steel carrier 52 and an outer magnetic steel 53, the outer magnetic steel carrier 52 is provided with the outer magnetic steel 53 inside, and the two ends of the outer magnetic steel carrier 52 are respectively connected to the flange shaft 51 and the end cover 59; the inner component includes an inner magnetic steel 54 and an inner magnetic steel carrier 57 which are arranged in sequence from the outside to the inside, the inner magnetic steel carrier 57 is sleeved on the output shaft of the motor 1, and bearings 4 are arranged on the outer circumferences of the two ends of the inner magnetic steel carrier 57, and the outer circumferences of the bearings 4 are respectively connected to the flange shaft 51 and the end cover 59.

[0043] The bearing 4 in this embodiment needs to be reliably positioned axially, specifically: the outer ring of the bearing 4 near the flange shaft 51 is positioned by the flange shaft 51, the inner ring of the bearing 4 near the motor 1 is positioned by the end cover 59, and the outer side of the magnetic steel carrier 57 in the inner ring of the bearing 4 is arranged in a step shape for positioning, thereby eliminating the axial force of the gear drive belt.

[0044] During installation, the bearing 4 and the torque-limiting magnetic coupling pair 5 are first installed, and then transported to the site together with the transition sleeve 6 as the modified body. After the reduction motor is disassembled on site, the input gear 3 on the output shaft of the motor 1 is first disassembled and installed on the flange shaft 51, and then the modified body and the output shaft of the motor 1 are installed as a whole, and then the transition sleeve 6 and the reduction box 2 are installed as another whole, and finally the transition sleeve 6 is connected to the motor 1, and the two wholes are combined into one, and the lubricating oil is re-injected through the oil filling port of the reduction box 2 to complete the installation. The steps are also simple and the installation speed is fast, which fully reflects the advantages of modular design.

[0045] During actual operation, when the output shaft of the motor 1 rotates, the inner and outer components rotate simultaneously by utilizing the transmission principle of the torque-limiting magnetic coupling pair 5, and the output shaft of the reduction box 2 is driven by the input gear 3 to realize the transmission mode of the original reduction motor. The principle is the same as that of Example 1.

[0046] One of the outer magnetic steel and the inner magnetic steel in the above embodiment can be replaced with a conductive material so that the motor end and the reducer end can operate asynchronously. In this way, the reduction motor can have both synchronous and asynchronous operation modes to meet the needs of various occasions.

[0047] The embodiments are preferred implementations of the present invention, but the present invention is not limited to the above-mentioned implementations. Any obvious improvements, substitutions or modifications that can be made by those skilled in the art without departing from the essential content of the present invention belong to the protection scope of the present invention.

Claims

1. A reduction motor provided with a magnetic coupling protection device, comprising a motor (1), a reduction gear and an input gear (3), characterized in that: It also includes a torque-limiting magnetic coupling pair (5) built between the motor (1) and the reducer, the torque-limiting magnetic coupling pair (5) including an inner magnetic steel (54) and an outer magnetic steel (53), the outer magnetic steel (53) being sleeved outside the inner magnetic steel (54), with an air gap between the inner magnetic steel (54) and the outer magnetic steel (53); the inner magnetic steel (54) being sleeved on the output shaft of the motor (1) via an inner magnetic steel carrier (57), the outer magnetic steel (53) being connected to the flange shaft (51) via one end of the outer magnetic steel carrier (52), the flange shaft (51) being mounted with an input gear (3), the input gear (3) being meshed with the reducer gear; It also includes a bearing (4) and a transition sleeve (6) built between the motor (1) and the reducer; the outer circumference of the external magnetic steel carrier (52) is connected to the bearing (4); the outer circumference of the bearing (4) is connected to the transition sleeve (6); the transition sleeve (6) is fixed between the motor (1) and the reducer (2); the input gear (3), the bearing (4), the flange shaft (51), the external magnetic steel carrier (52), the external magnetic steel (53) and the transition sleeve (6) cooperate to rotate around the axis.

2. The reduction motor provided with a magnetic coupling protection device according to claim 1, characterized in that: The transition sleeve (6) is provided with supporting ribs on the inner side thereof, the supporting ribs being connected to the bearing mounting sleeve (7), and the bearing mounting sleeve (7) is internally connected to the bearing (4).

3. The reduction motor provided with a magnetic coupling protection device according to claim 1, characterized in that: An inner magnetic steel adjusting sleeve (55) is provided between the inner magnetic steel (54) and the inner magnetic steel carrier (57), and adjusting mechanisms are respectively provided at both ends of the inner magnetic steel carrier (57) along the axial direction.

4. The reduction motor provided with a magnetic coupling protection device according to claim 3, characterized in that: The adjusting mechanism adopts a screw.

5. The reduction motor provided with a magnetic coupling protection device according to claim 1, characterized in that: The other end of the outer magnetic steel carrier (52) is connected to the end cover (59), and bearings (4) are provided at both ends of the inner magnetic steel carrier (57), and the outside of the bearings (4) are respectively connected to the flange shaft (51) and the end cover (59).

6. The reduction motor provided with a magnetic coupling protection device according to claim 1, characterized in that: The outer magnetic steel (53) or the inner magnetic steel (54) can be replaced with a conductive material.

7. The reduction motor provided with a magnetic coupling protection device according to claim 2, characterized in that: The bearing (4) is used for axial positioning.

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