CN2030111U - High frequency vibrator and its frequency changer - Google Patents

Abstract

The utility model discloses a high frequency vibration device used for vibrating and densifying work of concrete constructions, and provided with a high frequency vibrator comprising a motor, a machine base and an eccentric block, and a frequency converter comprising a motor, an exciter and a generator. The main shaft of the high frequency vibrator is split into three stages supported by six bearings; the generator armature of the frequency converter is arranged on the inner ring of a magnetic pole, which reduces the volume of yoke iron, enhances rotational inertia and the work efficiency of a machine set, and relieves the problem of an overlarge installed capacity preserved with the consideration of starting in the matching of the frequency converter and the high frequency vibrator. The high frequency vibration device is widely suitable for the concrete constructions such as model compactions, vibrating tables, vibrating beams, airport runways, concrete pavements, dock and harbor foundations, etc.

Description

High frequency vibrator and its frequency changer

The utility model relates to a kind of dither equipment that is used for the work of concrete works vibration compacting.

Form vibrator is a kind of equipment that concrete works generally uses, it is a setting-up eccentricity piece on motor rotor, when motor rotor rotated, the centrifugal force that eccentric block produces made motor vibration work, is used for the vibration compacting concrete.The form vibrator of producing mostly is (frequency is no more than 3000 times/minute) of low frequency greatly at present, in order to increase work efficiency and quality, also (frequency can reach 6000 times/minute at the trial-production dither in many places, 9000 times/minute, even 12000 times/minute), but the supporting of existing dither, drive mechanism all is single shafts, two fulcrum types, two bearings promptly are set at the motor rotor shaft two ends, (or on shaft part of bearing inboard) setting-up eccentricity piece on the shaft extension outside bearing, though this dither has had very big progress on the basis of low frequency vibrator, but because of the motor speed height, vibration is big, bearing is run under the condition of high speed and heavy duty, be damaged easily, the life-span of vibrator is shortened greatly.

At present in the prior art with the supporting variable-frequency power sources of dither, the domestic Asynchronous Frequency-variable unit (brush is arranged) that all adopts, just there is minority to adopt brushless frequency conversion unit at some special occasions (as the aviation frequency conversion), unit's brush frequency conversion unit does not have carbon brush and slip ring, it is reliable to work, but the structure of existing brushless frequency conversion unit is interior field-rotatable type, rotating rectifier is in the axle head setting, under the frequency conditions of higher, iron loss is big, efficient is low, and axial length is longer simultaneously.

The purpose of this utility model is to start with from improving prior art constructions, develop a kind ofly can alleviate bearing load, and is reliable, dither that the life-span is grown and the high efficiency that matches with it, low-loss frequency conversion unit.

The purpose of this utility model reaches by the following technical programs, dither and frequency conversion unit thereof, have by motor, support, the dither that eccentric block is formed and by motor, exciter, the frequency conversion unit that generator is formed, it is characterized in that: the dither main shaft is divided into three sections, supported by six bearings, the tooth embedding of the axis of motor rotor by two ends respectively with a left side, right axis is meshed, a left side, eccentric block is equipped with at the right axis middle part respectively, be provided with interior outer end cap at the two ends of support, a bottom bracket bearing and a left side, the right axis bearing is respectively by interior, the bearing position of outer end cap is fixed.The motor of frequency conversion unit, exciter, generator is got in touch by same main shaft, generator armature is arranged on the inner ring of magnetic pole, fix by armature sleeve and upper end cover, the seam of upper end cover matches with support, device has upper bearing (metal) in the armature sleeve, the activity of armature sleeve and set main shaft is cooperated, the end that main shaft stretches out in the generator armature sleeve is the circular cone shaft extension, the circular cone shaft extension is connected with a umbrella shape yoke flange seat, the supporting of formation umbrella shape is installed rotating rectifier in the cavity of yoke flange seat end face.

There is a through wires hole at frequency conversion set main shaft middle part, through wires hole from the break-through of exciter armature in the cavity of yoke flange seat end face, make laying wires usefulness, also have through wires hole in the cavity of yoke flange seat end face from cavity to generator magnetic pole.

The end face of the blue seat of frequency conversion unit yoke method has a cover cap, as the protection rotating rectifier, is cast with blade on the cover cap, and under the frequency conversion operating states of the units, this blade plays the effect of fan, cooling frequency changer assembly housing.

Dither and frequency conversion unit thereof are equipped with outlet box, and bumper pad is arranged in the outlet box, clamp nut and sealing ring, and cable inserts by outlet box.

According to dither and the frequency conversion unit thereof that the utility model proposed, on the basis of existing technology, by changing supporting, the drive mechanism of dither, the load of vibrator bearing is alleviated greatly, life-span increases, improve the bearing reliability of operation, under the condition of using homemade bearing, produced the dither of reliable operation.By improvement to supporting frequency conversion unit, make it compared with prior art have following advantage: 1, because inner ring is transferred to from the outer ring in the position of this machine generator alternating flux, the volume of yoke portion iron reduces greatly, and efficient is improved.2, because the rotating part (magnetic pole) of generator is transferred to the outer ring from inner ring, its diameter increases, rotary inertia is improved greatly, be in operation and also play the effect of flywheel, directly improved the starting capability of frequency changer to dither, reached the effect of " quota starting ", exempted frequency changer installed capacity problem of crossing because of considering that starting leaves in supporting with dither.Not only reduced the design capacity of frequency changer, reduce the frequency changer acquisition expenses, and (the fixed loss value that had in the total losses of frequency changer of installed capacity is bigger can to improve the efficient of frequency changer actual motion, actual efficiency step-down when light running, though efficiency index is higher during its nominal load, but can not full-load run because of it, this index is actual to be empty).3, axial length is little, and compact conformation is easy to maintenance, compares with the domestic Asynchronous Frequency-variable machine that generally adopts at present, and because of this machine brushless, functional reliability improves greatly.

Dither structure of the present utility model, suitable no matter high frequency, low frequency are, have identical effect and effect.

Fig. 1 is the overall schematic of the utility model embodiment;

Fig. 2 is the dither profile of the utility model embodiment;

Fig. 3 is the schematic diagram of the frequency conversion unit of the utility model embodiment:

According to accompanying drawing the utility model is further described below:

The complete machine auxiliary work situation of dither of the present utility model shown in Fig. 1 and frequency conversion unit thereof, dither (45) is placed on the vibration platen (44), frequency conversion unit (48) is vertical installation, the frequency conversion unit is from power controling box (49) input 380V 50HZ three-phase alternating-current supply, unit is output as 250V 150HZ three-phase alternating-current supply, is incorporated into dither by switch control cabinet (47) and cable (46).

Among Fig. 2, dither is made up of motor (comprising stator 10, rotor 11), support (12), several major parts of eccentric block (4,18), its main shaft is divided into three sections, be axis (9), left side axle (1), right axis (16), three sections axles are supported by six bearings respectively, comprise bottom bracket bearing (8), left side axle bearing (2), right axis bearing (15).The tooth embedding (7,21) of the axis (9) of motor rotor (11) by two ends is meshed with left and right limit axle (1,16) respectively and is connected transmission, left and right limit axial symmetry distributes, and eccentric block (4,18) is equipped with at its middle part respectively.Be provided with inner end cap (6,20) and outer end cap (5,19) at the two ends of support (12), bottom bracket bearing and left and right limit axle bearing are fixed by the bearing position of inside and outside end cap respectively.The bottom bracket bearing of present embodiment selects for use the single-row radial ball bearing of two single or double band dust caps or sealing ring to support, and left and right limit axle bearing adopts single grade of limit of inner ring single-row centripetal cylindrical roller bearing.Be respectively equipped with cover cap (3,17) in the outside of outer end cap (5,19), the top of support (12) is an outlet box (14), is provided with bumper pad in the box, and cable (13) is by in the outlet box access machine.

Structure situation with the matching used frequency conversion unit of dither has been shown among Fig. 3, mainly comprise: the cavity (22) of device rotating rectifier, upper bearing (metal) (23), generator magnetic pole (24), fan housing (25), generator armature (26), upper end cover (27), exciter magnetic pole (28), exciter armature (29), main shaft (30), support (31), motor stator (32), motor rotor (33), outlet box (34), lower bearing (35), bottom end cover (36), rectifier cover cap (37), blade (38), yoke flange seat through wires hole (39), yoke flange seat (40), circular cone shaft extension (41), armature cover letter (42), main shaft through wires hole (43).

The motor of frequency conversion unit (48), exciter, generator are got in touch by same main shaft (30), and generator armature (26) is arranged on the inner ring of magnetic pole (24), and be fixing by armature sleeve (42) and upper end cover (27).The seam of upper end cover matches with support (31).Device has upper bearing (metal) (23) in the armature sleeve, and the activity of armature sleeve and set main shaft (30) is cooperated.The end that main shaft stretches out in the generator armature sleeve is circular cone shaft extension (41), and the circular cone shaft extension is connected with a umbrella shape yoke flange seat, forms the umbrella shape supporting.Rotating rectifier is installed in the cavity (22) of yoke flange seat end face.There is a through wires hole (43) at frequency conversion set main shaft (30) middle part, in the cavity (22) of through wires hole from corresponding exciter armature (29) break-through to yoke flange seat end face, makes laying wires and uses.The through wires hole (39) that in the cavity of yoke flange seat end face, also has from cavity to generator magnetic pole (24).Yoke flange seat (40) end face has a cover cap (37), is used to protect rotating rectifier, is cast with blade (38) on the cover cap; under the frequency conversion operating states of the units; this blade rotates at random, plays the effect of fan, cooling frequency changer assembly housing.The frequency conversion unit is provided with outlet box (34), and cable inserts by outlet box.The frequency conversion unit adopts the three-phase semiwave rotating rectifier.

Claims (1)

1, a kind of dither and frequency conversion unit thereof, have by motor, support, the dither that eccentric block is formed and by motor, exciter, the friendship that generator is formed is unit frequently, it is characterized in that dither (45) main shaft is divided into three sections, supported by six bearings, the axis (9) of motor rotor (11) is by the tooth embedding (7 of two ends, 21) respectively with a left side, right axis (1,16) be meshed, a left side, eccentric block (4 is equipped with at the right axis middle part respectively, 18), the two ends of support (12) are provided with inner end cap (6,20) and outer end cap (5,19), a bottom bracket bearing (8) and a left side, right axis bearing (2,15) by interior, the bearing position of outer end cap is fixed, the motor of frequency conversion unit (48), exciter, generator is got in touch by same main shaft (30), generator armature (26) is arranged on the inner ring of magnetic pole (24), go up fixing at upper end cover (27) by armature sleeve (42), device has upper bearing (metal) (23) in the armature sleeve (42), main shaft (30) is connected with yoke flange seat (40) by circular cone shaft extension (41), in the cavity (22) of yoke flange seat end face rotating rectifier is installed, is cast with blade (38) on the rotating rectifier cover cap (37).

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