CN2291267Y

CN2291267Y - High-efficiency percussion arrangement of eccectric slide electric drill

Info

Publication number: CN2291267Y
Application number: CN 97207390
Authority: CN
Inventors: 薛玉专
Original assignee: NANJING INST COAL SCIENTIFIC GENERAL INST
Current assignee: NANJING INST COAL SCIENTIFIC GENERAL INST
Priority date: 1997-03-20
Filing date: 1997-03-20
Publication date: 1998-09-16
Anticipated expiration: 2007-03-20

Abstract

The utility model relates to a high efficiency percussion arrangement of eccentric slide electric drill, which can cause Py harmful force to disappear and can assure the work efficiency of an electric rock drill. The utility model comprises an impact hammer, a small shaft, eccentric blocks, tilt wheels and slide ways, wherein, the middle part of the impact hammer is provided with a cross hole, and the small shaft penetrates through the cross hole. The utility model is characterized in that both ends of the small shaft are provided with two eccentric blocks which can rotate around the small shaft, the edges of the two eccentric blocks are respectively fixed with a tilt wheel, and the tilt wheel can respectively insert into the two slide ways connected with two bevel gears.

Description

The efficient beater mechanism of eccentric slider type electric rock drill

The utility model relates to a kind of new and effective beater mechanism, is used for belonging to the mining machine field with the eccentric slider type electric rock drill of centrifugal force as impact power.

In mining engineering, one of broken effective way of getting rock is a bore blowing-up method.And rock drill is the capital equipment in Drilling big gun hole.In the place that does not have compressed-air system, select electric rock drill usually for use.The eccentric slider type electric rock drill is simple in structure, and is easy to maintenance, and power is single, and flexible operation is used comparatively general.The beater mechanism of typical eccentric slider type electric rock drill as shown in Figure 1.It is made up of cylinder body 1, main eccentric block 2, secondary eccentric block 3, block stamp 4, axle sleeve 5, roller 6, motor 7, chute 8, little axle 9, buffering air chamber 10.

When motor 7 drives chute 8 rotations, chute 8 is stirred main eccentric block 2[by roller 6 and annotated: roller and main eccentric block are fixed on one] rotate synchronously with motor 7 around little axle 9, because of secondary eccentric block 3 and main eccentric block 2 coaxial connections, so secondary eccentric block 3 also rotates with motor 7 synchronously around little axle 9.Major and minor eccentric block drives the block stamp motion producing centrifugal force in the rotation at a high speed around little axle 9.Because the front end of block stamp 4 has axle sleeve 5 rear ends that cylinder body 1 supporting is arranged, and when block stamp 4 travels forward, is ballistic motion, tup bump bit shank, the realization rock drilling is crept into.When block stamp 4 moves backward, be drawback movement, the buffering air chamber 10 that this moment, block stamp 4 rear end pistons and cylinder body 1 were formed is in compressive state.The impulse force that compressed GAS ABSORPTION block stamp 4 moves backward, and this power conversion become elastic potential energy, be stored in the air cushion of compression, treat to discharge when block stamp 4 travels forward, to increase the kinetic energy of bump bit shank.When motor 7 rotations 1 circle, major and minor eccentric block also changes 1 circle, and this moment, block stamp 4 was finished a working cycles.

The deficiencies in the prior art part is: (being illustrated with reference to Fig. 2)

Deriving centrifugal force by Newton's law is

P＝m·r·ω ² (1)

M in the formula---eccentric block quality, Kg;

R---eccentric block center of gravity is to centre of gyration radius, m;

ω---eccentric block angular speed, radian/S.

Its X axis component is

P _x＝P·cosθ (2)

θ in the formula---eccentric block rotational angle.

The y axial thrust load is

P _y＝P·sinθ (3)

Obvious X axis component P _xBe impulsive force, its size is to change with the eccentric block rotational angle theta.

Y-axis is to component P _yJust be pressed on cylinder body and the axle sleeve, its size also changes with the eccentric block corner, i.e. P _y=f (θ).The frictional force that produces during the block stamp motion is:

P _f＝P _y·f

F in the formula---coefficient of friction

The direction of frictional force is opposite with the block stamp direction of motion, hinders block stamp and moves back and forth, and is the resistance of motion, therefore, and P _yBe harmful component.According to P _y=f (θ) is according to formula (3) P _y=Psin θ, by the variation of θ, we can make P _yThe cycle change curve of component is seen Fig. 3.This figure illustrates P _yComponent changes with sinusoidal rule, eccentric block revolution 2 π, component P _yPositive and negative variation once, its maximum value is P.This power not only makes machine produce judder, but also the bearing-surface at block stamp two ends is caused uneven wear, and rock penetration performance is reduced greatly.

The purpose of this utility model then is the problem at above-mentioned existence, has designed a kind of P of making _yHarmful power disappears, thereby guarantees the efficient beater mechanism of eccentric slider type electric rock drill of electric rock drill operating efficiency.

The purpose of this utility model can reach by following measure:

The efficient beater mechanism of a kind of eccentric slider type electric rock drill, comprise block stamp, little axle, eccentric block, roller, chute, wherein there is a cross-drilled hole at the block stamp middle part, be installed with a little axle in the cross-drilled hole, it is characterized in that: be equipped with at the two ends of little axle can be around two eccentric blocks of little axle rotation, each fixes a roller in the edge of two eccentric blocks, and this roller inserts respectively in two chutes that link with two bevel gears.

The purpose of this utility model can also reach by following measure:

Two shared axial lines of bevel gear, and the number of teeth of two bevel gears equates;

The gap bridge bevel gear is meshed with two bevel gears simultaneously.

Advantage of the present utility model:

Utilize the impact principle of centrifugal force, kept useful P _xComponent has been offset harmful P _yComponent to improving the target efficiency of rock drill, reduces vibration, noise and wearing and tearing that machine itself is produced, has positive effect.

Fig. 1 is the prior art structural representation.

Fig. 2 is prior art ballistic motion force analysis figure.

Fig. 3 is prior art eccentric block centrifugal force vertical stress component Changing Pattern figure.

Fig. 4 is the utility model schematic diagram.

Fig. 5 is the utility model structural representation.

Fig. 6 is Fig. 5 A-A cutaway view.

Below in conjunction with accompanying drawing the utility model is further described:

With the secondary eccentric block b of main eccentric block a coaxial line on increase by a motive power, make two eccentric blocks be driving link, but during motion coaxial not in the same way, crucial wanting synchronously.After adjusting initial point position, it is consistent that two eccentric block rotary speeies are wanted, and could guarantee like this: when eccentric block a when being rotated counterclockwise the pi/2 position, eccentric block b then is rotated clockwise to 1.5 π positions, in the meantime the P that produced of two centrifugal force P _yComponent is cancelled out each other; When a forwarded the π position to, b had also arrived the π position, the centrifugal component P of two eccentric blocks _xIn the same way, make block stamp make drawback movement; When a forwarded 1.5 π to, b had forwarded pi/2 to, two centrifugal component P _yCancel out each other again; A is rotated further to 2 π positions, and b has just forwarded 0 position to, two centrifugal component P _xAct on altogether on the block stamp, make block stamp do the acceleration shock motion.

This mechanism is made up of block stamp, little axle, left and right sides eccentric block, left and right sides roller, left and right sides chute, left and right conical gear and gap bridge bevel gear.There is supporting constraint at block stamp 4 two ends, block stamp 4 only can be seesawed and can not rotate.The middle part of block stamp 4 has a little axle 9 to cross and mistake, little axle 9 two ends respectively can be around the eccentric block 2,3 of little axle rotation with one, on the marginal position separately of eccentric block 2,3, be fixed with roller 6,13, roller 6,13 inserts chute 8,11 near in the groove of end by the position of setting respectively, and chute 8,11 bodies link to each other with bevel gear 14,12.The power of motor is will rotatablely move by a gap bridge bevel gear 15 to pass to the identical bevel gear of two numbers of teeth 12, on 14, bevel gear 12,14 again by chute 11,8 stir roller 6,13, thereby drive two eccentric blocks 2,3 high-speed synchronous but in the same way the rotation, the eccentric block 2 of high speed rotation, 3 consequent enough big centrifugal force have driven block stamp 4, make it under constrained condition, can only make front-rear reciprocation movement, because two eccentric blocks 2,3 original position is given design earlier and is adjusted, it is opposite that its direction of rotation is wanted, rotary speed must be consistent, thereby can realize keeping and making full use of the useful centrifugal component P of eccentric block _x, eliminate harmful component P _yPurpose, and then guarantee to make this mechanism have higher impact energy.

Claims

1, the efficient beater mechanism of a kind of eccentric slider type electric rock drill, comprise block stamp, little axle, eccentric block, roller, chute, wherein there is a cross-drilled hole at the block stamp middle part, be installed with a little axle in the cross-drilled hole, it is characterized in that: be equipped with at the two ends of little axle can be around two eccentric blocks of little axle rotation, each fixes a roller in the edge of two eccentric blocks, and this roller inserts respectively in two chutes that link with two bevel gears.

2, the efficient beater mechanism of eccentric slider type electric rock drill according to claim 1 is characterized in that two shared axial lines of bevel gear, and the number of teeth of two bevel gears equates.

3, the efficient beater mechanism of eccentric slider type electric rock drill according to claim 1, the bevel gear that it is characterized in that passing a bridge is meshed with two bevel gears simultaneously.