CN201371259Y

CN201371259Y - Electric hammer

Info

Publication number: CN201371259Y
Application number: CN200920114919U
Authority: CN
Inventors: 姜卫亮; 应时立
Original assignee: 姜卫亮; 应时立
Current assignee: Jiahe Tools Co., Ltd.
Priority date: 2009-03-06
Filing date: 2009-03-06
Publication date: 2009-12-30
Anticipated expiration: 2019-03-06

Abstract

The utility model discloses an electric hammer which can effectively solve the problems that the existing electric hammer has large noise, and has fast carbon-brush wearing so as to cause the machine to have shorter service life and low whole efficiency. The electric hammer comprises a case, a driving mechanism, an eccentric device, an air cylinder, a piston, an output clamping head, a driving mechanism and a handle, wherein one end of the eccentric device is arranged on the piston which is arranged in the air cylinder; the output clamping head is arranged at the other end of the air cylinder; the electric hammer also comprises a brushless motor and a circuit controller; a stator of the brushless motor is fixed on the case; a rotor shaft of the brushless motor is arranged on the case by a rolling device; the rotor shaft is connected with the other end of the eccentric device; and the circuit controller is arranged on the case. The electric hammer has the advantages that the brushless motor is adopted, the noise is small, no carbon-brush dust and no carbon-brushless wearing exist, the efficiency is improved by 30 percent, the service life of the machine is longer than that of a series motor by a plurality of times, and the cost can be saved by utilizing the case of the electric hammer as the case of the brushless motor.

Description

A kind of electric hammer

Technical field

The utility model relates to a kind of electric tool, particularly a kind of electric hammer.

Background technology

Electric hammer is because impulsive force is bigger, often use and on to harder object, hole, on concrete floor, its operation principle is: drive drill bit by motor by transmission mechanism and rotate, have the driven by motor eccentric stiffener to make piston reciprocating air in cylinder simultaneously, the air pressure cycle in the cylinder changes the top that the hammer in the drive cylinder back and forth hits drill bit.

Existing electric hammer mainly uses series excited machine, and series excited machine noise is bigger in use, and be subjected to structural limitations own, series excited machine need use carbon brush, carbon brush and slip ring surface contact, because the cause of spring pressure effect and elastic properties of materials distortion embeds direct contact portion mutually.When relative slip, because of rubbing action forms wearing and tearing.If the carbon brush particle is thick and stiff, or contain hard particles, mechanical wear is increased greatly just like diamond dust and so on.Simultaneously because contain a spot of cementite in the carbon brush, carborundum is the husky ashes of Buddha's warrior attendant, improving the anti-wear performance of brush, but also can make the collector ring surface pull into groove, in case form groove very harmful to motor.Carbon brush is non-metallic conduction material, and resistance coefficient is big, is 400 times of copper.The energy consumption height that resistance produces; Contact resistance, mechanical friction hear rate that the sliding friction conduction that continues produces, the resistance energy consumption that adds power up brush is converted into Gao Reyi wears out spring decompression and lead, causes loose contact, produces spark, has a strong impact on motor and normally moves.And carbon brush will rely on elastic force and slip ring surface contact, if too small carbon brush of pressure and slip ring surface contacts instability, causes electric arc easily, makes the commutator wear increase.Pressure is excessive, and the solids of brush finish is scraped the slip ring surface and cut seriously, and mechanical wear is increased.And existing electric hammer can't work under the situation of civil power not having, and restricted its use.

The utility model content

The purpose of this utility model is to provide a kind of electric hammer, and it is big effectively to solve existing electric hammer noise, can produce the carbon brush dust, and the carbon brush quick abrasion causes machine shorter service life, the problem that whole efficiency is not high.

In order to solve the problems of the technologies described above, the utility model is achieved through the following technical solutions: a kind of electric hammer, comprise casing, eccentric, cylinder, piston, output clip, transmission mechanism and handle, one end of described eccentric is arranged on the piston, described piston is arranged in the cylinder, described output clip is arranged on the other end of cylinder, also comprise brushless electric machine and circuit controller, the stator of described brushless electric machine is fixed on the casing, the armature spindle of described brushless electric machine is arranged on the casing by tourelle, described armature spindle links to each other with the other end of eccentric, and described circuit controller is arranged on the casing.

Preferably, described casing is provided with ventilating opening, and the two ends that an end of described armature spindle is provided with fan blade or armature spindle are provided with fan blade; Armature spindle drives fan blade and rotates, and increases the circulation of air of electric hammer inside, is motor and inner member cooling.

Preferably, described circuit controller is arranged on the casing between ventilating opening and the fan blade; The air that produces when fan blade is rotated flows and is the circuit controller cooling.

Preferably, the stator of described brushless electric machine is an annular, evenly is provided with some coil teeth on the inwall of described annular stator; On described each coil tooth around coil and the coil on the adjacent windings tooth between leave interior ventilating duct; Leave ventilating duct in stator interior, the cooling stator coil.

Preferably, also comprise power pack and charging battery cartridge, described handle, at its lower end is provided with lead, and described lead one end is provided with plug, and described power pack and charging battery cartridge are provided with the socket suitable with line trap; Can power with power pack when civil power is arranged, can not power with charging battery cartridge when having civil power, charging battery cartridge can be connected charging with lead with power pack.

Preferably, the outside of described stator is provided with at least one positioning boss or at least one detent; Make things convenient for the stator of brushless electric machine fixing on casing, prevent the stator rotation.

Preferably, an end of described transmission mechanism is arranged on cylinder outer wall, and the other end of described transmission mechanism links to each other with armature spindle; Utilize cylinder outer wall to replace power transmission shaft that revolving force is passed to drill bit, simplified the electric hammer internal structure, save cost.

Compared with prior art, the utility model has the advantages that: adopt brushless electric machine, noise is little, does not have the also non-carbonate wearing and tearing of carbon brush dust, and efficient improves 30%, service life of a machine is than the high several times of series excited machine, circuit controller can be realized rotation-clogging protection, overcurrent protection, overvoltage protection, utilizes the casing of electric hammer to save cost as the shell of brushless electric machine, and circuit controller embeds casing inside Anywhere, reduce external control line raising reliability and make more convenient operation, realized real electromechanical integration; Can under the environment of no civil power, rely on battery-powered operation, realize the wide voltage of a machine dual-purpose civil power.

Description of drawings

The utility model is described in further detail below in conjunction with accompanying drawing:

Fig. 1 is the structural representation of a kind of electric hammer of the utility model;

Fig. 2 is the brushless motor stator structural representation of a kind of electric hammer of the utility model;

Fig. 3 is the brushless motor stator and the positioning boss section structure schematic diagram of a kind of electric hammer of the utility model;

Fig. 4 is the brushless motor stator and the detent section structure schematic diagram of a kind of electric hammer of the utility model.

The specific embodiment

Consult the embodiment of Fig. 1 to Fig. 4 for a kind of electric hammer of the utility model, a kind of electric hammer, comprise casing 1, eccentric 2, cylinder 3, piston 31, output clip 4, transmission mechanism 5, handle 6, brushless electric machine and circuit controller 8, one end of described eccentric 2 is arranged on the piston 31, described piston 31 is arranged in the cylinder 3, described output clip 4 is arranged on the other end of cylinder 3, one end of described transmission mechanism 5 is arranged on cylinder 3 outer walls, the other end of described transmission mechanism 5 links to each other with armature spindle 72, the stator 71 of described brushless electric machine is fixed on the casing 1, the armature spindle 72 of described brushless electric machine is arranged on the casing 1 by tourelle, described armature spindle 72 links to each other with the other end of eccentric 2, described circuit controller 8 is arranged on the casing 1, and the armature spindle 72 of described brushless electric machine is arranged on the casing 1 by rolling bearing 11; Described casing 1 is provided with ventilating opening 12, and an end of described armature spindle 72 is provided with fan blade 73 or armature spindle 72 two ends all are provided with fan blade 73; Described circuit controller 8 is arranged on the casing 1 between ventilating opening 12 and the fan blade 73, and circuit controller 8 just is in the other separate ventilation road 13 of stator 71 like this; The stator 71 of described brushless electric machine is an annular, evenly is provided with some coil teeth 711 on the inwall of described annular stator 71; On described each coil tooth 711 around coil 712 and the coil 712 on the adjacent windings tooth 711 between leave in ventilating duct 713; The outside of described stator 71 is provided with at least one and cooperates positioning boss 714 or the detent 715 that prevents stator 71 rotations with casing 1; Electric hammer also comprises power pack 91 and charging battery cartridge 95, and described handle 6 lower ends are provided with lead 92, and described lead 92 1 ends are provided with plug 93, and described power pack 91 and charging battery cartridge 95 are provided with and the suitable socket 94 of lead 92 plugs 93.

During work, power pack 91 is inserted civil power, the plug 93 of lead 92 inserts in the socket 94 of power pack 91, rotate by switching device 61 control brushless electric machines, armature spindle 72 drives cylinder 3 rotations by transmission mechanism 5, the drill bit rotation that output clip 4 is clamped, and armature spindle 72 drives eccentric 2 motions simultaneously, piston 31 is moved reciprocatingly in cylinder 3, drill bit is impacted forward; In the place that does not have civil power, can be connected power supply by the socket 94 of charging battery cartridge 95 with the plug 93 of lead 92 and make electric hammer work.Control circuit in this power pack 91 can be suitable for 90-260V voltage, can use in most of area in the whole world, when not using electric hammer, charging battery cartridge 95 can be connected with power pack 91 simultaneously, gives charging battery cartridge 95 chargings by power pack 91.

The above only is the specific embodiment of the utility model the best, but architectural feature of the present utility model is not limited thereto, any those skilled in the art is in field of the present utility model, and variation of being done or modification all are encompassed among the claim of the present utility model.

Claims

1. electric hammer, comprise casing (1), eccentric (2), cylinder (3), piston (31), output clip (4), transmission mechanism (5) and handle (6), one end of described eccentric (2) is arranged on the piston (31), described piston (31) is arranged in the cylinder (3), described output clip (4) is arranged on the other end of cylinder (3), it is characterized in that: also comprise brushless electric machine and circuit controller (8), the stator of described brushless electric machine (71) is fixed on the casing (1), the armature spindle of described brushless electric machine (72) is arranged on the casing (1) by tourelle, described armature spindle (72) links to each other with the other end of eccentric (2), and described circuit controller (8) is arranged on the casing (1).

2. a kind of electric hammer as claimed in claim 1 is characterized in that: described casing (1) is provided with ventilating opening (12), and an end of described armature spindle (72) is provided with fan blade (73).

3. a kind of electric hammer as claimed in claim 1 is characterized in that: described casing (1) is provided with ventilating opening (12), and the two ends of described armature spindle (72) are provided with fan blade (73).

4. as claim 2 or 3 described a kind of electric hammers, it is characterized in that: described circuit controller (8) is arranged on the casing (1) between ventilating opening (12) and the fan blade (73).

5. a kind of electric hammer as claimed in claim 1 is characterized in that: the stator of described brushless electric machine (71) is an annular, evenly is provided with some coil teeth (711) on the inwall of described annular stator (71).

6. a kind of electric hammer as claimed in claim 5 is characterized in that: described each coil tooth (711) go up around coil (712) and the coil (712) on the adjacent windings tooth (711) between leave interior ventilating duct (713).

7. a kind of electric hammer as claimed in claim 1, it is characterized in that: also comprise power pack (91) and charging battery cartridge (95), described handle (6) lower end is provided with lead (92), described lead (92) one ends are provided with plug (93), and described power pack (91) and charging battery cartridge (95) are provided with and the suitable socket (94) of lead (92) plug (93).

8. a kind of electric hammer as claimed in claim 5 is characterized in that: the outside of described stator (71) is provided with at least one and cooperates the positioning boss (714) that prevents stator (71) rotation with casing (1).

9. a kind of electric hammer as claimed in claim 5 is characterized in that: the outside of described stator (71) is provided with at least one and cooperates the detent (715) that prevents stator (71) rotation with casing (1).

10. a kind of electric hammer as claimed in claim 1 is characterized in that: an end of described transmission mechanism (5) is arranged on cylinder (3) outer wall, and the other end of described transmission mechanism (5) links to each other with armature spindle (72).