CN2406052Y - Valve-less internal-revolving type pneumatic rock-drilling machine - Google Patents

Abstract

The utility model relates to a valve-less internal-revolving type pneumatic rock-drilling machine, which relates to a pneumatic mechanism. The utility model is composed of a casing, a piston, a rotating sleeve, a machine head, a drill sleeve and a caliper mechanism. The utility model is characterized in that a front air groove and a rear air groove are respectively arranged on the piston to be respectively communicated with a rear cavity and a front cavity of a cylinder through one-way holes in a piston body; an air inlet hole and an air outlet hole re arranged on the corresponding position of the cylinder; a catch hook ratchet mechanism is arranged on the top of a cylinder cover, and a spiral bar on a ratchet wheel is meshed with the nut-shaped tooth of the piston. The piston body plays the turning control action of air flow simultaneously under the action of the air flow, and the piston body can also finish front and back motion and rotary composite motion. Thus, the utility model has the advantages of simple structure, compact structure, good processing technology performance.

Description

Valveless internal rotary type air drill

The utility model relates to pneumatic machinery.

Present widely used pneumatic tool air drill, gas impact machine roughly is divided into two big classes, the first kind is that valve internal rotary type gas impact machine is arranged, second type is the outer swinging of valveless, it is piston upper guide post distributing type gas impact machine voluntarily, but in fact the guide pillar of this type piston rear end also is to play the valve effect, and this mechanism is not suitable for internal rotary type, otherwise structural volume increases.These two types of mechanism's common features are except the work air cavity of piston displacement, piston rear end also must have the air-flow break-in control air cavity of individual valve event or guide pillar distribution action, mechanism's length has extended, if increase slew gear again, then length is longer, and complex structure, increased the cooperation precision of valve or the cooperation precision requirement between the guide pillar guide pin bushing.The complexity of component with increase not only manufacturing cost height, also increased wear surface, thereby the tightness of having influence on, sensitivity still cause mechanical life.

The purpose of this utility model is to overcome above-mentioned defective, provides a kind of airless break-in to control the valveless internal rotary type air drill of air cavity mechanism.

Scheme of the present utility model is; Piston is contained in the cylinder, and piston nose is long splined shaft, twice air drain before and after having respectively on the outside piston post, respectively there is short hole to communicate in the groove with axial unidirectional hole in the piston body, air drain is communicated with the cylinder back cavity before making, and back air drain is communicated with the cylinder ante-chamber, and rifle nut fixedly is equipped with in central authorities of piston rear end portion.The side corresponding positions of cylinder is equipped with air inlet and venthole, air inlet is communicated with the air intake duct of casing, top of chamber has cylinder head behind the cylinder, the catch-hook ratchet mechanism is housed on the cylinder head, there is a rifle bar to be enclosed within ratchet hole central authorities, catch-hook is housed on the rifle bar, and the spiral-shaped teeth of rifle bar is meshed with the spiral-shaped teeth of piston rear end portion rifle nut and stretches into wherein.

Advantage of the present utility model is, simple in structure, compact, volume is little, because reject air-flow break-in control air cavity is directly born break-in control with the pistons work air cavity, so it is simple in structure, amount of parts reduces, and has improved the process industrial art performance of part, and machining accuracy is guaranteed easily, the air flue break-in has simply improved tightness, structure rationalization has made the volume contraction in length, thereby has improved the technical performance of entire mechanism, has reduced manufacturing cost.

Accompanying drawing 1 has valve internal rotary type beater mechanism schematic diagram for the existing first kind.

Accompanying drawing 2 is the outer swinging beater mechanism schematic diagram of the existing second type valveless.

Accompanying drawing 3 is a valveless internal rotary type air drill structural representation.

1 is the catch-hook ratchet mechanism among the figure, and 2 is rifle bar, and 3 is air inlet, and 4 is rifle nut, and 5 is venthole, and 6 is piston, and 7 is casing, and 8 is turning set, and 9 is head.

The utility model is to implement like this: valveless internal rotary type air drill is made up of casing, piston, turning set, head, drill sleeve, caliper unit, and cylinder is car system in casing.Piston is contained in the cylinder, piston nose is long splined shaft, be inserted in turning set, twice air drain before and after having respectively on the outside piston post, respectively there is short hole to communicate in the groove with axial unidirectional hole in the piston body, air drain is communicated with the cylinder back cavity before making, and back air drain is communicated with the cylinder ante-chamber, and rifle nut fixedly is equipped with in central authorities of piston rear end portion.The side corresponding positions of cylinder is equipped with air inlet and venthole, air inlet is communicated with the air intake duct of casing, top of chamber has cylinder head behind the cylinder, the catch-hook ratchet mechanism is housed on the cylinder head, have a rifle bar to be fixed on ratchet hole central authorities, the spiral-shaped teeth of rifle bar is meshed with the spiral-shaped teeth of piston rear end portion rifle nut and stretches into wherein.When drill steel is inserted in drill sleeve, after high-pressure air pipe and hammer drill are connected, open the casing control valve, high pressure draught enters the air inlet of cylinder by the casing inner flow passage, thereby the preceding air drain and the unidirectional hole thereof that enter piston enter the cylinder back cavity, back cavity pressure raises piston forward is pushed away, this moment, the cylinder ante-chamber communicated with the cylinder gas outlet, piston is released ante-chamber gas by venthole, when piston forward is advanced when venthole covered, but ante-chamber gas stream nowhere begins to be compressed and boosts, piston leans on still forward impelling of inertia, air drain is communicated with the cylinder venthole before making piston, air drain is communicated with air inlet behind the piston, because behind the unidirectional hole of front and back air drain and the cylinder, ante-chamber is communicated with, that is to say this moment air-flow by piston after air drain enter the cylinder ante-chamber, and the high pressure gas of back cavity is discharged by venthole by the preceding air drain of piston, the front and back draught head promotes piston again backward, air drain is crossed the cylinder intake hole behind piston, the cylinder ante-chamber stops air inlet, and then piston crosses the cylinder venthole, and air drain moves to the venthole position before the piston, going round and beginning again again, it is moving to push before piston is done, and so finishes the ballistic motion to drill steel repeatedly.When piston advances forward, the effect by the catch-hook ratchet can only make rifle bar rotate to a direction, can not reverse.Be that piston does not rotate, rifle bar and catch-hook one that front end is inserted in piston certainly rotate counterclockwise.And piston is when retreating, because ratchet can not reverse.Rifle bar can not be reversed, under the helical tooth effect, piston is rotated counterclockwise, this gyration is passed to drill steel through turning set, makes drill steel do gyration, impacts and rotating compound motion thereby impel drill steel to do front and back.

Claims (1)

1, a kind of valveless swinging air drill, comprise casing, piston, turning set, head, caliper unit, it is characterized in that piston is contained in the cylinder, piston nose is long splined shaft, twice air drain before and after having respectively on the outside piston post, respectively there is short hole to communicate in the groove with axial unidirectional hole in the piston body, air drain is communicated with the cylinder back cavity before making, back air drain is communicated with the cylinder ante-chamber, rifle nut fixedly is equipped with in central authorities of piston rear end portion, the side corresponding positions of cylinder is equipped with air inlet and venthole, and air inlet is communicated with the air intake duct of casing, and top of chamber has cylinder head behind the cylinder, the catch-hook ratchet mechanism is housed on the cylinder head, have a rifle bar to be enclosed within ratchet hole central authorities, catch-hook is housed on the rifle bar, the spiral-shaped teeth of rifle bar is meshed with the spiral-shaped teeth of piston rear end portion rifle nut and stretches into wherein.

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