CN85103288A

CN85103288A - Milling drum

Info

Publication number: CN85103288A
Application number: CN85103288.5A
Authority: CN
Inventors: 中岛素春; 坂根征四郎; 佐藤纪道; 春田悦郎
Original assignee: Shinko Electric Co Ltd; NKK Corp
Current assignee: JFE Engineering Corp; Shinko Electric Co Ltd
Priority date: 1985-05-02
Filing date: 1985-05-02
Publication date: 1987-01-21
Also published as: CN1012563B

Abstract

A milling drum comprises a housing, and this housing has the suction hole of introduction air and the steam vent of exhaust.A motor is contained in the housing, and a rotating shaft is arranged.One desk fan is contained in the rotating shaft securely, and rotates with rotating shaft.Fan has a seat portion, and has loaded onto many blades in the present portion, and these blades make air pass housing outflow steam vent from suction hole, thus cooling motor.In the fixing present portion of emery wheel.

Description

Milling drum

The invention relates to and hold the milling drum that carries out.

Existing various small and exquisite milling drum, they can grasp the burr that polishes weldment and remove foundry goods.The milling drum commonly used that is illustrated among Fig. 1 is a boxlike milling drum.Milling drum 10 comprises: a garden post shell 12, and an end of this shell 12 opens wide; A HF inducing motor 14.This motor 14 comprises a garden post housing 14a, it is to open wide and be supported in the shell 12 that this housing 14a has an end, open end for closure casing 14a, a flange 14b arrives the open end of housing 14a continuously, the two ends of a rotatable axle 14c are passed the outside elongation of an end wall 14d of flange 14b and housing 14a respectively and are bearing in rotatably on pair of

bearings

16 and 18, this is to bearing 16 and 18, be separately fixed on end wall 14d and the flange 14b, a rotor 14a is contained on the 14c securely, and 14c rotates with axle, stator 14f is contained in the housing 14a of

rotor

14e, 14c is protruding from shell 12 for axle, and a dish-shaped ring flange 20 is contained on the outer end of a 14c securely.Emery wheel 22 and coaxial the matching of the outer surface of ring flange 20.A fixture 24 closely is engaged in the centre bore of emery wheel 22 and ring flange 20, and a screw passes emery wheel 22 and ring flange 20, and lemon enters the outer end of a 14c, so that emery wheel 22 is clamped and is fixed between the flange head 24a and ring flange 20 of fixture 24.Therefore, ring flange 20 plays an emery wheel installed part.Helical fan 26 for cooling motor is contained in the inner of a 14c securely and rotates with axle 14c.Circular passage 28 is made of the interior garden perimeter surface of shell 12 and the outer garden perimeter surface of housing 14a.A lot of suction hole 12a pass the end wall 12b of garden post shell 12.Because this structure is arranged, in the rotation of motor 14, fan 26 is rotated face makes air pass air entry 12a inspiration, pass circular passage 28 then, discharge from the beginning 28a of passage 28, shown in the arrow among Fig. 1, so that introduce shell 12 by air, cool off the garden perisporium of flange 14b and housing 14a, thereby stoped the overheated of motor 14.

Because this milling drum is to be used to hold carry out grinding, so people wish that the milling drum of this form is small and exquisite as far as possible and light.Yet because the ring flange 20 of fan 26 and support emery wheel 22 is along being installed with dividually on the axle 14c at their place, according to this fact, milling drum 10 commonly used is satisfied inadequately.

Therefore, by the invention provides a smaller and more exquisite and light milling drum, and manufacturing cost is lower.

The invention provides a milling drum that comprises a housing.This housing has the suction hole of introducing air; Discharge the steam vent of air; A motor that is contained in the housing has a rotatable axle; A fan is contained in the above-mentioned rotating shaft securely, and rotates with rotating shaft, a support is arranged on the fan and much be contained in blade on the support, and this blade makes air pass housing from air entry, flows out exhaust outlet, thus the cooling said motor; A Grinding wheel is fixed on the above-mentioned support.

The main explanation of figure:

Fig. 1 is the cutaway view of a milling drum of prior art.

Fig. 2 is the cutaway view of a milling drum of the present invention.

The narration of most preferred embodiment of the present invention:

The milling drum 30 that is illustrated among Fig. 2 comprises: a casing 31; This casing 31 is made up of a garden post housing 32 and a flange 34, and this garden post housing 32 has a beginning 32e, and this flange 34 generally is the garden dish type, is fixed on the beginning 32e with screw 35.Garden post housing 32 is made of the wall 32a and an end wall 32b in a garden week, and this end wall 32b is in the end position away from the garden perisporium 32a of beginning 32o.On the inner surface of this end wall 32b, a central tubular part 32c is arranged.Many suction hole 32d are on the end wall 32b that is passed between garden perisporium 32a and the tubular type part 32c.This flange 34 has a hollow 34a concentric with garden post housing 32, and there is a through hole at the center of hollow 34a.The radially outer ring position 34d that passes flange has a lot of steam vent 34c.A motor 14 comprises a rotatable axle 14c, this 14c is supported rotatably by pair of

bearings

36 and 38, and pair of

bearings

36 and 38 is to be contained in respectively in the tubular type part 32c of the 34a of flange 34 and end wall 32b, and axle 14c passes the hole 34b and the elongation of flange 34.Motor 14 also comprises a rotor and the stator that is contained in the casing 32, and this rotor is to be contained in regularly on the 14c, and rotates with axle 14c; This stator is around rotor 14e.

The fan 40 of a molded structure is contained in the outer end of a 14c regularly, and with axle 14 rotations.Fan 40 comprises and is close to a 40a of portion who is engaged on the 14c, is a 40b of portion around the dish of portion 40a outer end, and the 40b of seat portion is generally perpendicular to a 14c, facing flange 34 and along the inner face of the 40b of seat portion of the radial extent of the 40a of portion, forming a lot of blades.Supporting surface is made with the inside diameter of hollow toroid 40d in the outside of the 40b of this.

The centre of an emery wheel 22 is offset out a bulge loop shape 22a, and this bulge loop shape 22a generally is and the shape complementarity of hollow toroid 40d that the centre of passing the dish wheel forms a centre bore 22b.Emery wheel 22 matches with the outside of the 40b of seat portion of fan 40, and simultaneously, bulge loop shape 22a matches with the hollow toroid 40d of the 40b of seat portion.Fixture 24 is engaged in emery wheel centre bore 22b and the 40a of portion, and screw 25 passes fixture 24 lemons and goes into the outer end of rotating shaft 14c, so that emery wheel 22 is clamped in securely between the flange head 24a and the 40b of seat portion of fixture 24, does not move to keep emery wheel.

Handle 44 is securely fixed on the end of circumferential wall 32a of tank shell 32, and the switch 46 of control motor 14 is to be contained on the handle 44.

In operation, press switch 46 CD-ROM drive motors 14, the axle 14c that connects together with fan 40 and emery wheel 22 is rotated, so that blade 40c by fan 40, make air enter tank shell 32,, discharge from steam vent 34c then through forming the part of motor in the tank shell 32 by suction hole 32d.Shown in the arrow among Fig. 2, therefore, through during the tank shell 32, can suitably make the motor cooling at air.

Fan 40 both had been used for cooling motor, was used for cooling off the emery wheel fixture again.Especially there has been the 40b of seat portion of fan 40 to avoid separating of emery wheel and seat portion.Thereby axle 14c can shorten length so that the whole dimension of milling drum 30 also can be dwindled.In addition, in this embodiment, do not need to need the shell of a storage case housing 32 as milling drum shown in Figure 1.This also facilitates the minimizing of the size and the weight of milling drum.Because of air process tank shell 32, motor 14 can cool off effectively again.Again, fan 40 is arranged on the outside of tank shell 32, and the diameter of fan can suitably increase, to increase cooled containers.Therefore, motor 14 cools off so effectively, so that the iron of motor can subtract book, because for not requiring very big thermal radiation.As mentioned above, the number of parts of milling drum 3C can reduce, so that reduce manufacturing cost.

Compare with milling drum 10 commonly used shown in Figure 1, the weight of milling drum 30 of the present invention is approximately less than 30%, along the axial length of axle 14c approximately not about 25%.

Although milling drum of the present invention represents especially and narrated, should invention itself be subjected to the restriction of strict accompanying drawings and description. For example: form although fan 40 grinds structure by one, blade 40c can stick with glue, and spiral or welding form overall structure, are fixed firmly on the 40b of section.

Claims

1, milling drum is characterised in that: a housing has the suction hole of introducing air and the steam vent of discharging air; A motor is contained in the housing, and a rotating axle is arranged; One desk fan is securely fixed in the rotating shaft, and rotates with axle; A seat portion is arranged on fan and much be contained in the blade of a portion, these blades make air pass housing from suction hole to flow out steam vent, thus the cooling said motor, in the fixing present portion of another one emery wheel.

2, be characterised in that according to the described milling drum of claim 1: seat portion generally is a dish, and be vertically to be contained in the above-mentioned rotating shaft as another, blade is contained in the side of a portion facing to housing, and is contained in axle radially, the another side of the fixing present portion of emery wheel.

3, be characterised in that according to the described milling drum of claim 1: above-mentioned housing is a garden post shapes, and this garden post shapes at one end has end wall, and the other end opens wide, and a lot of suction holes are arranged on the end wall, and these suction holes pass end wall, constitutes the suction hole device.A cover plate is connected to the beginning of housing.And a lot of steam vents are arranged.These steam vents constitute the steam vent device.Above-mentioned rotating shaft is passed flange and is stretched out outside housing, and fan is contained in the rotating shaft of stretching out outside housing partly, and near the position of flange.Thus, when motor rotates, air is drawn into housing from suction hole, from steam vent, discharges then by blade.

4, be characterised in that according to the described milling drum of claim 1: fan is a molded structure.