CN203119705U

CN203119705U - Motor with mechanical overload protection device

Info

Publication number: CN203119705U
Application number: CN2013201465810U
Authority: CN
Inventors: 苟军善; 强惠萍; 黄新宇; 李宝锋
Original assignee: Yongji Xinshisu Electric Equipment Co Ltd
Current assignee: CRRC Yongji Electric Co Ltd
Priority date: 2013-03-28
Filing date: 2013-03-28
Publication date: 2013-08-07
Anticipated expiration: 2023-03-28

Abstract

The utility model relates to motors with overload protection devices, in particular to a motor with a mechanical overload protection device. The motor comprises a motor hollow shaft, a torque shaft sleeved in the motor hollow shaft and a torque limiting coupler. An outer shaft sleeve of the torque limiting coupler is connected with the motor hollow shaft at the non-driving end of the motor through a spline. The torque shaft sleeved in the motor hollow shaft is connected with an inner shaft sleeve of the torque limiting coupler through a spline. An axial bolt on the end face of the torque limiting coupler is inserted onto the end surface of the torque shaft. Compared with existing mechanical protection structures, the motor with the mechanical overload protection device has the advantages that the motor can be unloaded in time to protect the motor from being damaged during overloading; and oil pressure standard setting of the torque limiting coupler is simple, precise and easy to control, the motor can recover to work in quite short time only after a shearing tube is replaced and oil pressure is reset, and replacement of the torque shaft is not needed, so that cost of the mechanical protection device is greatly saved. The motor-overloading mechanical protection device is suitable for all types of motors.

Description

The motor that has the machine overload protection device

Technical field

The utility model relates to the motor that has overload protection arrangement, is specially a kind of motor that has the machine overload protection device.

Background technology

Motor needs under different operating modes with different loads; usually motor can satisfy the unequally loaded requirement; but tunnel in the colliery; fields such as traffic water conservancy tunnelling; because coal seam; the tunnel weak soil; mix the stratum; geology differences such as hard rock is moisture; the peak torque of these geology is difficult to prediction; usually be that load exceeds nominal torque or because the variation of voltage makes motor moment overload; usually like this, can cause electrical fault even damage; unavoidably cause engineering and production loss; just seem extremely important so guarantee the normal safe operation of motor, so motor generally can arrange overload protection.The overload protection of motor mainly contains electic protection and mechanical protection at present; if the impact acceleration in short-term of overcurrent, overvoltage takes place in motor in operation process; the electic protection that then is arranged in the control circuit works; if but electic protection lost efficacy or protection arranges improperly, and then can cause the infringement that motor is bigger.For avoiding this situation; when the design motor; except control loop arranges electic protection; also can mechanical protection be set at motor; the existing motor that has a Machine guarding as shown in Figure 1; comprise motor-hollow axle 1 and the torque axis 2 that is enclosed within the motor-hollow axle 1; torque axis 2 is fixed in the motor-hollow axle 1 by spline 4 and copper bracer 6; the non-transmision end of torque axis 2 also the motor shaft by being arranged on the back end cover for motor place to link 5 at axial restraint; be processed with gap 3 on the axial plane of torque axis 2; if during overload; torque axis 2 can be from gap 3 positions fracture on the axial plane; make the motor overload unloading like this, protected motor, avoided electrical fault further to enlarge.Though can protect motor during the Machine guarding that has on motor overload; but to process gap at torque axis; gap will lean on designing and calculating and technology to guarantee; be multiple that load surpasses the motor nominal torque when requiring torque axis to rupture at opening position, like this with regard to exist the torque axis replacement cost too high, change inconvenience consuming time, inefficient problem.

Summary of the invention

The utility model provides a kind of motor that has the machine overload protection device in order to solve the overload Machine guarding cost height that has on the prior motor, to change inconvenience consuming time, inefficient problem.

The utility model is to adopt following technical scheme to realize: the motor that has the machine overload protection device, comprise motor-hollow axle and be enclosed within the interior torque axis of motor-hollow axle, also comprise the torque limiting shaft coupling, the torque limiting shaft coupling comprises outer shaft and is enclosed within the both arms pressure sleeve that the internal axle sleeve in the outer shaft constitutes, bearing also is housed between outer shaft and the internal axle sleeve, have high-voltage oil cavity on the entity part of internal axle sleeve vertically, the high-voltage oil cavity opening part is plugged with shears pipe, the shearing ring that notch is arranged on the anchor ring is also fixedly arranged in the outer shaft, the top of shearing pipe is embedded in the notch of shearing ring, the outer shaft of torque limiting shaft coupling is connected by the motor-hollow axle of spline with the motor non-transmision end, the torque axis that is enclosed within the motor-hollow axle is connected by the internal axle sleeve of spline with the torque limiting shaft coupling, and the axial bolts on the internal axle sleeve end face of torque limiting shaft coupling is inserted on the end face of torque axis; Before the machine operation, according to injecting hydraulic oil in the high-voltage oil cavity that loads on the torque limiting shaft coupling, hydraulic oil to the pressure of high-voltage oil cavity as the oil pressure standard, form friction pair between internal axle sleeve and the outer shaft, when motor-hollow axle rotates, the outer shaft that motor-hollow axle drives the torque limiting shaft coupling rotates, outer shaft drives internal axle sleeve and torque axis rotates, torque axis drives load again, this oil pressure standard has determined the peak torque that can transmit (sliding torque) value, when if the moment of torsion of load surpasses the sliding torque limit value, outer shaft rotates with respect to internal axle sleeve, and the shearing ring on the outer shaft is cut off the head of shearing pipe on the internal axle sleeve, the hydraulic oil ejection in the high-voltage oil cavity, pressure on the torque limiting shaft coupling discharges, after the pressure release, slide relatively between the outer shaft on the torque limiting shaft coupling and the internal axle sleeve, unclamp friction and connect, thereby motor is in time unloaded, and the protection motor is injury-free; When motor is reworked; only need to change shear pipe and again the pressurization back in the extremely short time, just can resume work; the utility model provides a kind of connected mode that the torque limiting shaft coupling is applied to the motor overload protection; when motor overload, by cutting off the shearing pipe motor is separated with load; protect motor, and greatly reduced the cost of motor overload protection.

The utility model is compared with existing machinery protection structure; in time the unloading protecting motor is injury-free for motor during overload; and the oil pressure standard setting of torque limiting shaft coupling is simple, accurate; easy to control; each only need to change can resume work in the utmost point short time after shearing pipe and resetting oil pressure; and also need not change torque axis; be the motor of 132KW for rated power; a torque axis is approximately 1.2 ten thousand yuan; and an expense of shearing pipe is less than 100 yuan; and the torque limiting shaft coupling is reusable, has saved the cost of Machine guarding greatly.This motor overload Machine guarding is fit to all motors to be used.

Description of drawings

Fig. 1 is the existing structural representation that has the motor of Machine guarding.

Fig. 2 is structural representation of the present utility model.

Fig. 3 is the end view of Fig. 2.

Fig. 4 is the A-A cutaway view of Fig. 3.

Among the figure: 1-motor-hollow axle, 2-torque axis, 3-gap, 4-spline, 5-motor shaft be to link, 6-copper bracer, and 7-torque limiting shaft coupling, the 8-outer shaft, the 9-internal axle sleeve, the 10-bearing, the 11-high-voltage oil cavity, 12-shears pipe, 13-shearing ring, 14-axial bolts.

Embodiment

The motor that has the machine overload protection device; comprise motor-hollow axle 1 and the torque axis 2 that is enclosed within the motor-hollow axle 1; also comprise torque limiting shaft coupling 7; torque limiting shaft coupling 7 comprises outer shaft 8 and is enclosed within the both arms pressure sleeve that the internal axle sleeve 9 in the outer shaft constitutes; between outer shaft 8 and the internal axle sleeve 9 bearing 10 is housed also; have high-voltage oil cavity 11 on the entity part of internal axle sleeve 9 vertically; the high-voltage oil cavity opening part is plugged with shears pipe 12; the shearing ring 13 that notch is arranged on the anchor ring is also fixedly arranged in the outer shaft 8; the top of shearing pipe 12 is embedded in the notch of shearing ring 13; the outer shaft 8 of torque limiting shaft coupling 7 is connected by the motor-hollow axle 1 of spline and motor non-transmision end; the internal axle sleeve 9 of torque axis 2 by spline and torque limiting shaft coupling 7 that is enclosed within the motor-hollow axle 1 is connected, on the end face of the axial bolts 14 insertion torque axis 2 on internal axle sleeve 9 end faces of torque limiting shaft coupling 7.During concrete enforcement, the connection spline on the torque axis 2 is IN5480N55 * 3 * 30 * 17 * 9H, its good connecting effect.

Claims

1. the motor that has the machine overload protection device; comprise motor-hollow axle (1) and be enclosed within the interior torque axis (2) of motor-hollow axle (1); it is characterized in that also comprising torque limiting shaft coupling (7); torque limiting shaft coupling (7) comprises outer shaft (8) and is enclosed within the both arms pressure sleeve that the internal axle sleeve (9) in the outer shaft constitutes; between outer shaft (8) and the internal axle sleeve (9) bearing (10) is housed also; have high-voltage oil cavity (11) on the entity part of internal axle sleeve (9) vertically; the high-voltage oil cavity opening part is plugged with shears pipe (12); the shearing ring (13) that notch is arranged on the anchor ring is also fixedly arranged in the outer shaft (8); the top of shearing pipe (12) is embedded in the notch of shearing ring (13); the outer shaft (8) of torque limiting shaft coupling (7) is connected by the motor-hollow axle (1) of spline and motor non-transmision end; the internal axle sleeve (9) of torque axis (2) by spline and torque limiting shaft coupling (7) that is enclosed within the motor-hollow axle (1) is connected, on the end face of axial bolts (14) the insertion torque axis (2) on internal axle sleeve (9) end face of torque limiting shaft coupling (7).