CN1012563B - Grinding machine - Google Patents

Abstract

The present invention relates to a milling machine which comprises a casing. The casing is provided with a suction hole for sucking air and a vent hole for discharging the air. A motor is arranged in the casing and is provided with a rotating shaft. A fan is firmly arranged on the rotating shaft and rotates with the rotating shaft. The fan is provided with a seat part, and a plurality of blades are arranged on the seat part. The blades cause the air to pass through the casing through the suction hole to flow out of the vent hole. Thereby, the motor is cooled. A milling wheel is fixed to the seat part.

Description

Grinding machine

The present invention relates to a usefulness hand and grip the milling drum that carries out polishing operation.

The weld seam of weldment can be tied and polish to now existing various small and exquisite hand-guided grindings with them, also can remove the burr on the foundry goods.Shown in Figure 1 is a kind of common boxlike milling drum 10.This milling drum 10 comprises a cylinder blanket 12, and the one end opens wide, and a high-frequency induction formula motor 14 is housed in the housing.Motor 14 comprises a cylindrical housings 14a again, this housing 14a one end opens wide, and be supported on the inwall of shell body 12, one end cap 14b is connected with the open end of housing 14a and with housings close, one rotating shaft 14c, one end stretches out from end cap 14b, the other end stretches out from end wall 14d, and two external parts are respectively by pair of bearings assembly 16 and 18 swivel bearings, and bearing 16 and 18 outer shroud are with respect to end wall 14d and end cap 14b fixed installation.A rotor that is fixedly mounted on the rotating shaft 14c rotates with rotating shaft, and stator 14f is installed in the housing 14a around rotor 14e.Rotating shaft 14c is protruding from shell body 12, and a dish-shaped ring flange 20 is fixedly mounted on the overhanging end part of rotating shaft 14c.One end face of one abrasive grinding wheel 22 and an end face of ring flange 20 are fitted, and coaxial together rotation.The centre bore tight fit of one fixture 24 and emery wheel 22 and ring flange 20, a screw 25 passes emery wheel 22 and ring flange 20, and the overhanging end of precession rotating shaft 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.One propeller fan (or fan) the 26th is used for cool motors 14, and it is fixedly mounted in the inner end of rotating shaft 14c and rotates with rotating shaft.One circular passage 28 is determined by the inner circumferential surface of shell 12 and the external peripheral surface of housing 14a.On the end wall 12b of cylinder blanket 12, formed one group of air admission hole 12a.Adopt a kind of like this structure, when motor 14 rotations, fan 26 just is driven, thereby air is sucked from air admission hole 12a, and by circular passage 28, preferably the openend from a passage 28 flows out, gas flow is shown in arrow among Fig. 1, as a result, the circumference wall of end cap 14b and housing 14a is convenient to be cooled by the cooling air that enters shell 12, just can prevent the overheated of motor 14 whereby.

Because the milling drum of this pattern grips with hand and carries out polishing operation, so people wish that it can be small and exquisite as far as possible and light.Yet common milling drum 10 has increased volumetric spaces, thereby has found that it is not exclusively gratifying because ventilation blower 26 wherein and being used for supports the ring flange 20 of emery wheel 22 splits along rotating shaft 14c.

The purpose of this invention is to provide a kind of smaller and more exquisite and light milling drum and make it have lower cost.

According to milling drum of the present invention, it comprises a shell, have the vent device that is used for sucking the air admission hole device of air and is used for discharged air on the shell, also comprise the motor that is installed in described enclosure interior and has a rotating shaft, also comprise an electric fan assembly that is fixedly mounted in the described rotating shaft and rotates with rotating shaft, this assembly comprises that a mount pad and is assembled in one group of blade on the mount pad, thereby blade rotation sucks air and flows to steam vent in the described housing again and make said motor cooling from air admission hole, comprise that also one is fixedly mounted on the abrasive grinding wheel on the mount pad.

Fig. 1 is the cross section view according to a milling drum of prior art;

Fig. 2 is the cross section view according to a milling drum of the present invention.

A milling drum 30 as shown in Figure 2 comprises a tubular shell 31, housing 31 by an end opening wherein, the cylinder blanket 32 of other end sealing and a common dish and form by the end cap 34 that screw 35 is connected on the shell aperture end 32c.Cylindrical shell body 32 has an outer circumferential walls face 32a and an end wall surface 32b, and end wall surface 32b forms away from the end of openend 32e at outside wall surface 32a.End wall 32b mid portion has a tubular jut 32c, and it is positioned on the end wall inner surface.On the annular end face between circle wall 32 and the tubular jut wall 32c, one group of air admission hole 32d that penetrates described end wall is arranged.There is a hollow wheel hub 34a at end cap 34 middle parts, and a centre bore 34b is arranged on the 34a.On the radially outside part 34d of end cap 34 one group of steam vent 34c is arranged.Motor 14 comprises a rotating shaft 14c, and this rotating shaft is rotatably mounted by pair of bearings 36 and 38, and bearing 36 and 38 is installed in respectively on the tubular lobes part 32c of the hollow wheel hub 34 of end cap 34 and end wall 32b, and rotating shaft 14c extends through from the centre bore 34b of end cap 34.Motor 14 also comprises a rotor 14e, and it is fixed on rotating shaft 14a and upward and with rotating shaft rotates, and in addition, also comprises a stator 14f, and it is installed on the internal face of shell body 32 around rotor 14e.

The electric fan assembly 40 of one monolithic molded structure is fixed on the overhanging end of rotating shaft 14c and with rotating shaft and rotates.Flabellum assembly 40 comprises a tubulose hub portion 40a, this part and rotating shaft 14c tight fit, also comprise a mount pad part 40b, it is generally dish, and be positioned at around the hub portion 40a, sponson on it is usually vertical with rotating shaft 14c, one group of blade be positioned at mount pad 40b in the face of on the internal face of end cap 34 and from hub portion 40a radially outside extension.The outer surface of mount pad 40b path portion within it is pressed and forms an annular groove 40d.

One emery wheel 22 has an annular bossing 22a in its part near the center, and the general and annular groove complementation of its shape has been a centre bore 22b on the emery wheel 22 simultaneously.Emery wheel 22 is fitted with the outer surface of the mount pad part 40b of flabellum assembly 40, and simultaneously, the bossing 22a of emery wheel 22 just in time is in the middle of the annular groove 40d of mount pad 40b.One fixture 24 centers among hole 22b and the wheel hub centre bore part 40a, one screw 25 revolved the overhanging end that enters rotating shaft 14c from fixture 24, so, emery wheel 22 just is clamped between the flange head 24a and mount pad 40b of fixture 24 tightly, thereby prevents that emery wheel 22 from moving axially.

One handgrip, 44 1 ends are fastened on the external peripheral surface of shell body 32, and a switch 46 that is contained on the handgrip 44 is used for handling motor 14.

In operating process, but press switch 46 just actuating motor make rotating shaft 14c together with 22 rotations of flabellum assembly 40 and emery wheel, thereby air is poured in the shell body 32 from inlet hole because of the rotation of the blade 40c on the flabellum assembly 40, yet by each element of motor, discharge the direction of the direction of air-flow shown in arrow among Fig. 2 at last from steam vent 34c.Therefore, by during the housing 32, motor 14 just is properly cooled at air.

Flabellum assembly 40 plays two kinds of effects simultaneously, and promptly a kind of is the cooling fan of cool motors 14, and another kind of effect is as the emery wheel installation component.More special is, because flabellum assembly 40 provides mounting portion 40b, thereby no longer needs independently emery wheel installation component, and therefore, rotating shaft 14c can reduce length, so the overall dimensions of whole milling drum is also reduced.In addition, in this embodiment, compare, also do not need a shell that holds shell body 32 with prior art milling drum shown in Figure 1.This also makes the size of milling drum and weight be reduced.Further, because air passes through shell body 32, thereby motor 14 can be cooled effectively.In addition because electric fan assembly 40 is placed in the outside of housing 32, so the diameter of flabellum assembly 40 can be increased effectively, till reaching a higher cooling energy.Therefore, motor 14 just can be cooled effectively so that the iron core thickness of motor can be reduced, and this is because do not need big thermal radiation this moment for iron core.As mentioned above, the number of parts of milling drum 30 can be reduced, thereby its cost is also reduced relatively to some extent.

Compare with plain grinding machine 10 shown in Figure 1, it is about 30% that milling drum of the present invention has reduced on weight, and approximately reducing 25% along length on the axis direction of rotating shaft 14c.

Although milling drum according to the present invention has been done special explanation and description at this, yet the present invention itself is not limited by the strictness of above-mentioned accompanying drawing and description.For example, although flabellum assembly 40 is to be made by a monolithic molded structure, yet each blade 40c also can stick with glue, and screw mode fastening or welding is pacified formation one overall structure on mount pad 40b of living.

Claims (5)

1, a kind of milling drum, it comprises a tubular shell, housing one end has an end wall, and the other end opens wide, and many air admission holes are arranged on the described end wall, an end that opens wide at housing is fixed with a dish-shaped end cap, and many steam vents are arranged on it; One is installed in the motor in the described housing, and this motor has a rotating shaft, and described rotating shaft is concentric and stretch out described end cap with housing; One is installed in a fan and the emery wheel in the described rotating shaft, it is characterized in that, is fixed with a mount pad that is roughly dish on end cap that part of stretched out in rotating shaft, at mount pad on the one side of end cap, radially form one group of blade, these blades form flabellum, and mount pad is vertical with rotating shaft to be installed.Another side at described mount pad is equipped with an emery wheel regularly, when motor rotates, can carry out polishing operation with emery wheel on the one hand, on the other hand, flabellum is discharged air after the air admission hole on the end wall sucks and make it to flow through motor from exhaust outlet, thereby motor is cooled off.

2, milling drum according to claim 1 is characterized in that air inlet and exhaust outlet are distributed in respectively on described end wall and the end cap.

3, milling drum according to claim 2 is characterized in that stretching out housing outside emery wheel radially, in a side of milling drum, an opening is arranged between housing and emery wheel, so that allow cooling air pass through.

4, milling drum according to claim 3 is characterized in that described housing and motor are separated from each other so that cooling air passes through.

5, milling drum according to claim 1 is characterized in that it comprises that one is convenient to the handle that hand grips.

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