CN2386925Y

CN2386925Y - Electric hammer

Info

Publication number: CN2386925Y
Application number: CN 99204303
Authority: CN
Inventors: 李宝志
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-03-06
Filing date: 1999-03-06
Publication date: 2000-07-12
Anticipated expiration: 2009-03-06

Abstract

The utility model discloses an electric hammer, which comprises an outer casing (6), a motor (9) which is positioned at the back end of the outer casing (6), a speed change gear pair (11), a drive striking shaft (8), a rotating body (7) which is positioned on the back part of the sealing cover (17) on the front end of the outer casing (6) and is fixedly sheathed on the drive striking shafts (8) and a striking body (5). The electric hammer is movably pressed springs by the striking body (5) along sawtooth-shaped convex edges (13) of the rotating body (7), and the springs are spread to drive the striking body (5) to make strike generated. The utility model has the advantages of simple structure, stable striking force and high work efficiency.

Description

A kind of electric hammer

The utility model relates to a kind of electric hammer, is a kind of percussion device that is installed on the electric tool final drive shaft.

Existing electric hammer, the eccentric shaft drivening rods that adopt more, piston on the connecting rod is high-speed motion compressed air in cylinder, thereby promote to hit the mode of son work, the electric hammer of this structure, because piston rapid movement meeting inspiration dust in cylinder, thereby cause piston and cylinder to wear and tear, working time one is long, gap between piston and cylinder is strengthened, and compression vapour is revealed, and hitting power descends, operating efficiency reduces greatly, cylinder is again because of frictional heating simultaneously, and reduce service life, and the electric hammer of this kind structure is because of complex structure still more, technology acuracy is high so difficulty of processing is big, the manufacturing cost height.

The purpose of this utility model just provides a kind of electric hammer that utilizes the compression elasticity realization strike of spring, and it is easy to wear that it has overcome existing electric hammer, the short and unsettled shortcoming of hitting power of life-span, and be easy to processing and manufacturing, cost is lower.

The utility model is that electric hammer comprises shell (6), the motor (9) of rear end in the shell, motor shaft (10) is paid (11) through change-speed gearing and is connected transmission strike axle (8), it is characterized in that in the front portion that axle (8) is hit in transmission being that the transmission of the back of shell (6) front end capping (17) is hit on the axle (8) and is fixedly connected with a rotor (7), this rotor (7) is circular, there is a circular hole (12) at the center, circular hole (12) is set in transmission and hits on the axle (8), rotor (7) bottom surface is the plane, several zigzag convex edges (13) are arranged above, there are a rising ramp (14) and a decline face in sawtooth dress convex edge (13), hit axle (8) in the rotation of the top of rotor (7) and go up suit one cylindrical strike body (5), connect spring (2) in the upper end of hitting body (5) through bearing (3), the upper end of spring (2) is hit axle (8) through spring pressure pad (1) and transmission and is connected, have several holes (15) in the top with respect to zigzag convex edge (13) of hitting body (5), tapping with respect to above-mentioned strike body in shell (6) has several vertical guide grooves (16), between above-mentioned hole (15) and guide groove (16), rolling element (4) is housed, in the one end patchhole (15) of rolling element (4), the other end stretches in the guide groove (16).

Of the present utility model being characterised in that at described rotor (7) fixedlyed connected with shell (6), hits body (5) and fixedlys connected with transmission strike axle (8), and the guide groove on shell (6) inwall saves not.

Of the present utility model being characterised in that between described rotor (7) and front end capping (17) also is equipped with a spring.

Owing to adopt such scheme, so can effectively overcome existing electric hammer hitting power instability, shortcoming easy to wear, strength is stable during work, owing to design in the utility model has rolling element, it can play the fixed guide effect again, can effectively prevent to swing when work, stability during maintenance work, and simple in structure.

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is the structure chart of the utility model embodiment 1.

Fig. 2 is the part sectioned view of the utility model embodiment 1.

Fig. 3 is the structural representation of zigzag convex edge 13 among the utility model embodiment 1.

Fig. 4 is the vertical view of rotor 7 among the utility model embodiment 1.

Embodiment 1:

As Fig. 1, Fig. 2, Fig. 3, shown in Figure 4, transmission body (7) is fixedlyed connected with transmission strike axle (a 2) suit by the circular hole (12) at its center, rotor (7) bottom surface is the plane, two zigzag convex edges (13) are arranged above, there are a rising ramp (14) and a decline face in zigzag convex edge (13), cylindric strike body (5) hits axle (8) suit in the top and the transmission of rotor (7), spring (2) is connected between bearing (3) and the spring pressure pad (1), hit body (5) and upward have two holes (15) with respect to the top of zigzag convex edge (13), tapping with respect to above-mentioned strike body on shell (6) inwall is vertical guide groove (16), rolling element (4) is installed between hole (15) and the guide groove (16), in the one end patchhole (15), the other end stretches in the guide groove (16), in the present embodiment, the power of motor (9) drives change-speed gearing through motor shaft (10) and pays (11) work, pay under the drive of (11) at change-speed gearing, transmission is hit axle (8) and is begun to rotate, hitting body (5) this moment can move upward along hitting axle (8) along the zigzag convex edge (13) on the rotor (7), while extrusion spring (2), when strike body (5) moves to the top of the rising ramp (14) on the zigzag convex edge (13), therefore transmission is hit axle (8) still in motion the time, hitting body (5) meeting descends along the decline face of zigzag convex edge (13) suddenly, hit rotor (7), thereby driving transmission strike axle (8) travels forward along the vertical guide groove (16) on shell (6) inwall, hit, because of transmission is hit axle (8) in continuous motion, so the above-mentioned course of work constantly repeats, finish and beat, impact.

Embodiment 2: rotor (7) is fixedlyed connected with shell (6), it is fixedly sleeved with transmission strike axle (8) to hit body (5), save the vertical guide groove (16) on shell among the embodiment 1 (6) inwall, between rotor (7) and the front end capping (17) spring is housed, other is with embodiment 1.

Claims

1, a kind of electric hammer, comprise shell (6), the motor (9) of rear end in the shell, motor shaft (10) is paid (11) through change-speed gearing and is connected transmission strike axle (8), it is characterized in that in the front portion that axle (8) is hit in transmission being that the transmission of the back of shell (6) front end capping (17) is hit axle (8) and gone up fixedly connected rotor (7), this rotor (7) is circular, there is a circular hole (12) at the center, the circular hole fixed cover is loaded on transmission and hits on the axle (8), rotor (7) bottom surface is the plane, several zigzag convex edges (13) are arranged above, and zigzag convex edge (13) have a rising ramp (14) and a decline face; Hit on the axle (8) to be set with a cylindrical strike body (5) in the transmission of the top of rotor (7), connect spring (2) in the upper end of hitting body (5) through bearing (3), the upper end of spring (2) is hit spool (8) through spring pressure pad (1) and transmission and is connected; Have several holes (15) in the top with respect to zigzag convex edge (13) of hitting body (5), tapping with respect to above-mentioned strike body in shell (6) has several vertical guide grooves (16), between above-mentioned hole (15) and guide groove (16), rolling element (4) is housed, in the one end patchhole (15) of rolling element (4), the other end is stretched in the guide groove (16).

2, a kind of electric hammer as claimed in claim 1 is characterized in that described rotor (7) fixedlys connected with shell (6), hits body (5) and hits axle (8) with transmission and fixedlys connected, and the guide groove on shell (6) inwall saves not to be wanted.

3, a kind of electric hammer as claimed in claim 1 or 2 is characterized in that between described rotor (7) and front end capping (17) spring being housed also.