CN201376223Y

CN201376223Y - Angle grinder

Info

Publication number: CN201376223Y
Application number: CN200920146096U
Authority: CN
Inventors: 倪永立
Original assignee: Ningbo Hailian Electric Appliance Co Ltd
Current assignee: Ningbo Hailian Electric Appliance Co Ltd
Priority date: 2009-03-24
Filing date: 2009-03-24
Publication date: 2010-01-06
Anticipated expiration: 2019-03-24

Abstract

The utility model relates to an angle grinder which comprises an insulating shell (2), a power wire (1), a pull rod (8) matched with a switch (4) for use, a push button (7) as well as a circuit board (3), a motor (5) and the switch (4) that are installed inside the insulating shell (2), wherein the circuit board (3) is provided with a bridge type rectifier circuit, a fuse and an electrolytic capacitor, and the fuse is electrically connected between the power wire (1) and the bridge type rectifier circuit; the electrolytic capacitor is electrically connected between a positive output end and a negative output end of the bridge type rectifier circuit; one end of the switch (4) is electrically connected with the positive output end of the bridge type rectifier circuit, and the other end thereof is electrically connected with a positive pole of the motor (5); a negative pole of the motor (5) is electrically connected with the negative output end of the bridge type rectifier circuit; and the motor (5) is a permanent magnet type DC motor. The electric circular saw has the advantages of compact structure, small volume and low manufacturing cost.

Description

The angle grinding machine

Technical field:

The utility model relates to a kind of electric tool, specifically is a kind of angle grinding machine.

Background technology:

At present, the angle grinding machine that traditional permanent magnet dc motor drives is all by battery-powered, because the volume of battery pack is bigger usually, therefore causes the volume of angle grinding machine also bigger usually.For the structure that makes the angle grinding machine becomes compact, reduce the overall dimensions of angle grinding machine, many angles grinding machine manufacturer is driving the angle grinding machine with the single phase ac series excited machine, though the use of single phase ac series excited machine has reduced the volume of angle grinding machine to a certain extent, but because its price is more expensive than using battery pack and direct current generator, therefore, adopt the manufacturing cost of the angle grinding machine that the single phase ac series excited machine drives than higher.

The utility model content:

The technical problems to be solved in the utility model is, provides a kind of not only compact conformation, volume little, and the angle grinding machine of low cost of manufacture.

Technical solution of the present utility model is, a kind of angle grinding machine with following structure is provided, pull bar and the push button that it comprises insulation crust, power line, be used with switch and be installed in circuit board, motor and switch in the insulation crust; Described circuit board is provided with bridge rectifier, fuse and electrochemical capacitor; Described fuse is connected electrically between power line and the bridge rectifier; Described electrochemical capacitor is connected electrically between positive and negative two outputs of bridge rectifier; One end of described switch is electrically connected with the positive output end of bridge rectifier, and the one end is electrically connected with the positive pole of motor; The negative pole of described motor is electrically connected with the bridge rectifier negative output terminal; Described motor is a permanent magnet dc motor.

After adopting above structure, compared with prior art, the utlity model has following advantage: the utility model is because can be under the situation of not using battery pack, by the bridge-type current circuit rectification of alternating current is transformed into alternating current in the direct current that can drive the permanent magnet dc motor running, therefore, the utility model not only has compact conformation, the characteristics that volume is little, and since the price of permanent magnet dc motor well below exchanging series excited machine, so its manufacturing cost has obtained reducing greatly.

Description of drawings:

Fig. 1 is the structural representation that the utility model angle grinding machine partly cuts open.

Fig. 2 is the operating circuit catenation principle figure of the utility model angle grinding machine.

As shown in the figure, 1, power line, 2, insulation crust, 3, circuit board, 4, switch, 5, motor, 6, bridge rectifier, 7, push button, 8, pull bar, F1, fuse, C1, electrochemical capacitor.

Specific embodiment:

The utility model is described in further detail below in conjunction with the drawings and specific embodiments:

As depicted in figs. 1 and 2, in this specific embodiment, the utility model angle grinding machine comprises insulation crust 2, power line 1, circuit board 3, motor 5, switch 4 and the pull bar 8 and the push button 7 that are used with switch 4; Described circuit board 3, motor 5 and switch 4 are installed in the insulation crust 2; Described push button 7 is connected on the insulation crust 2; Described circuit board 3 is provided with bridge rectifier 6, fuse F1 and electrochemical capacitor C1; Described fuse F1 is connected electrically between power line 1 and the bridge rectifier 6; Described electrochemical capacitor C1 is connected electrically between positive and negative two outputs of bridge rectifier 6; One end of described switch 4 is electrically connected with the positive output end of bridge rectifier 6, and the one end is electrically connected with the positive pole of motor 5; The negative pole of described motor 5 is electrically connected with bridge rectifier 6 negative output terminals; Described motor 5 is a permanent magnet dc motor.

In the utility model, being provided with of described fuse F1 can be carried out current control to the alternating current on the power line 1, thereby prevented that the angle grinding machine from breaking phenomena taking place because of electric current is excessive; And described electrochemical capacitor C1 carries out filtering by the direct current that rectification is gone out, thereby plays the effect of burning voltage.When the user promotes push button 7 forward, thereby push button 7 will drive pull bar 8 and move right and connect switch 4, this moment, circuit board 3 will be given permanent magnet dc motor 5 by output DC, and the transmission component 8 in the grinding machine of angle will drive 9 rotations of angle abrasive disc under the driving of permanent magnet dc motor 5; The lower head of described insulation crust 2 is equipped with the protective cover 10 that is used for covering angle of entry abrasive disc 9.

Claims

1, a kind of angle grinding machine, it comprises insulation crust (2), power line (1), motor (5), switch (4) and the pull bar (8) and the push button (7) that are used with switch (4); Described motor (5) and switch (4) are installed in the insulation crust (2), it is characterized in that: it also comprises a circuit board (3) that is installed in the insulation crust (2); Described circuit board (3) is provided with bridge rectifier (6), fuse (F1) and electrochemical capacitor (C1); Described fuse (F1) is connected electrically between power line (1) and the bridge rectifier (6); Described electrochemical capacitor (C1) is connected electrically between positive and negative two outputs of bridge rectifier (6); One end of described switch (4) is electrically connected with the positive output end of bridge rectifier (6), and the one end is electrically connected with the positive pole of motor (5); The negative pole of described motor (5) is electrically connected with bridge rectifier (6) negative output terminal; Described motor (5) is a permanent magnet dc motor.