CN2382514Y - Speed regulating device of a pneumatic tool - Google Patents

Abstract

The utility model discloses a pneumatic tool's speed adjusting device, including accuse pneumatic valve, connecting rod and roating seat, the accuse pneumatic valve is installed in the intake duct on the shell and has inlet port and intake duct intercommunication, boss and the flange that accuse pneumatic valve rear portion axial salient corresponds each other, and the back lid is pressed on boss and flange, has in the boss to connect just or the contrary ditch of leading of covering in hole intercommunication inlet port and the back, forms the exhaust concave part that switches on with the exhaust passage on the shell between boss and flange. One end of the connecting rod is fixedly connected with the air control valve, and the other end of the connecting rod passes through the rear cover and is fixedly connected with the rotating seat. The utility model discloses rotate the roating seat and can turn to or the speed governing, simple structure, low cost, convenient operation.

Description

A kind of air tool arrangements for speed regulation

The utility model relates to a kind of adjusting device, especially a kind of air tool arrangements for speed regulation that have speed governing concurrently and turn to function.

Pneumatic tool is a kind of processing apparatus that utilizes gas to pass in and out to lock or unscrew screw, nut.It utilizes an admission gear that gas is introduced, to drive a transmission mechanism rotary work.In order to control the direction and the rotating speed of rotation work done, pneumatic tool is provided with speed adjusting gear and steering mechanism.As shown in Figure 1, form shell 11 by top chamber 111 and handle 112 in the general pneumatic tool 1, in the chamber 111 transmission mechanism 12 is housed up, the rear bearing block 121 at transmission mechanism 12 rear portions is provided with one is just changeing a through hole 122 and a reverse through hole 123.In order to introduce gas, on handle 112, have air intake duct 113, assembling road 114 and the connection the former two's of connection intersected with each other connection road 110, air intake duct 113 tops are communicated with a located lateral hole 115, there is bonnet 14 shell 11 rear ends, in order to reach the purpose of speed governing, control air inlet, steering mechanism 15 is housed on locating hole 115, is provided with flow speed control valve 16, control mechanism of qi structure 17 then is housed in assembling road 114 in air intake duct 113 bottoms.

Wherein, this steering mechanism 15 comprises the control lever 152 that the hollow sleeve 151 that is located in the locating hole 115 and can axial displacements in sleeve pipe 151, two breach 153 that are provided with before and after having on the control lever 152, have on the sleeve pipe 151 air admission hole 154 that can communicate and two with air intake duct 113 respectively with shell 11 on the pipeline 116 offered just communicate, contrary control pore 155,156 (only show a pipeline 116 among the figure, another pipeline fails to show in the drawings owing to shell 11 is broken away), two pipelines respectively with just be located on the bonnet 14, contrary guide channel 141,142 conductings, they are just guided to gas on the rear bearing 121, reverse through hole 122,123, the rotor of rear bearing block 121 front ends is just changeed or reverse.

One axle track 161 that communicates with air intake duct 113 is arranged on flow speed control valve 16, different speed governing hole 162, several apertures is set on axle track 161 outer walls, speed governing hole 162 can be corresponding with connection road 110 because of the rotation of flow speed control valve valve body.And control mechanism of qi structure 17 comprise one can vertical displacement in assembling road 114 slide bar 171, slide bar top and pressing plate 172 butts, bottom and steel ball 175 butts that shored by spring 174, steel ball 175 tops also have a packing 173, and the outlet of assembling 114 bottoms, road is connected with joint 176.

Be in when pneumatic tool under the state of reverse and full admission amount, the speed governing hole 162 of aperture maximum is corresponding with connection road 110 on the flow speed control valve 16, one of them breach 153 is communicated with air admission hole 154 and the contrary control pore 156 on the sleeve pipe 151 on the control lever 152, depress pressing plate 172 then, drive steel ball 175, packing 173 moves down, gas can enter through joint 176 and connect road 110 like this, the speed governing hole 162 of via hole diameter maximum enters axle track 161 again, enter air admission hole 154 by air intake duct 113 at last, contrary control pore 156, pipeline 116, the contrary hook 142 of leading, reverse through hole 123, enter rear bearing block 121 the place aheads at last and reverse to drive a rotor; When desiring to make pneumatic tool 1 just changeing, pushing control lever 152 can rotate flow speed control valve 16 in the time of will adjusting rotating speed, makes the speed governing hole 162 in different apertures corresponding with connection road 110.

As seen, change turns to and the purpose of speed governing though present pneumatic tool can reach by steering mechanism 15 and flow speed control valve 16, in order to assemble these elements, must offer complicated passage and a plurality of elements of assembling in passage on shell 11, thereby its difficulty of processing is big, the cost height.And when assembling steering mechanism 15, sleeve pipe 151 and locating hole 115 are closely cooperated, in order to guarantee air-tightness, must leave accurate fit tolerance again between sleeve pipe 151 and the control lever 152, therefore increased manufacture difficulty, and speed governing and steering mechanism divide to be arranged and also cause inconvenience in the adjustment.

The purpose of this utility model is to provide that a kind of element is few, cost is low and need not the too air tool arrangements for speed regulation of high manufacturing accuracy.

Arrangements for speed regulation of the present utility model comprise control valve, connecting rod and rotating seat.Control valve is installed in the air intake duct parallel with the top chamber in the shell, the air admission hole that communicates with air intake duct is arranged on it, the control valve rear axle is to outstanding corresponding mutually boss and flange, butt hole is arranged in the boss, can be communicated with positive guide channel or contrary guide channel on air admission hole and the bonnet, form between boss and the flange one can with the exhaust recess of exhaust duct conducting on the shell, the control valve rear portion is also outstanding can be fixedly coupled head with connecting rod.The connecting rod front end is affixed by connector and control valve, and the rear end passes bonnet and rotating seat is affixed.Like this, rotate rotating seat and just can drive the control valve rotation.

In the utility model, if pneumatic tool is just changeed, can rotate rotating seat and drive control valve, make the positive guide channel conducting on butt hole and the bonnet, gas just can enter the just commentaries on classics through hole on the rear bearing block by air intake duct, air admission hole, butt hole, positive guide channel, orders about rotor and just changes.Pneumatic tool is reversed, then only need to rotate rotating seat butt hole on the control valve and the contrary guide channel conducting on the bonnet are got final product.Adjust rotating speed and then be by the control butt hole with just, the degree of correspondence of contrary guide channel realizes, promptly when butt hole with just, contrary guide channel is fully over against rotating speed maximum then, when butt hole with just, rotating speed will reduce when contrary guide channel had dislocation.As seen, structure of the present utility model is very simple, and processing is than being easier to, and requirement on machining accuracy is not high, thereby can reduce cost greatly, and by element of rotating seat with regard to can realize turning to, two functions of speed governing, it is also very simple to operate.

Fig. 1 is existing air tool three-dimensional exploded view;

Fig. 2 is that embodiment of the utility model is installed in the stereogram on the pneumatic tool;

Fig. 3 is a three-dimensional exploded view of the present utility model shown in Figure 2;

Fig. 4 is an assembled sectional view of the present utility model shown in Figure 2;

Fig. 5 is pneumatic tool schematic diagram of the present utility model shown in Figure 2 when being in the reverse state;

Fig. 6 is that pneumatic tool is in schematic diagram of the present utility model shown in Figure 2 when just changeing state.

As Fig. 2, shown in Figure 3, arrangements for speed regulation 2 of the present utility model are assembled on the pneumatic tool 1, have on the shell 11 of pneumatic tool 1 top chamber 111 and be positioned at the below air intake duct 118, air intake duct 118 with above have exhaust duct 117 to be communicated with between the chamber 111, advance, be that handle 112 extends to the bottom again after exhaust duct all extends in parallel, in air intake duct 118 bottoms admission gear 119 is housed, assembling transmission mechanism 12 in the top chamber 111, offering on the rear bearing block 121 of one of transmission mechanism just changes through hole 122 and reverses through hole 123, shell 11 rears are assembled with bonnet 14 with screw rod 13, positive guide channel 141 is arranged on the bonnet 14, contrary guide channel 142, just, contrary guide channel extends to form positive passage 144 and contrary passage 145 respectively downwards.

As shown in Figure 3, Figure 4, arrangements for speed regulation 2 of the present utility model comprise control valve 4, connecting rod 5, rotating seat 6.The control valve valve body surface is the valve wall 41 of fitting with air intake duct 118 inwalls, be with leakproof ring 42 on the valve wall, control valve 4 is installed in the air intake duct 118, the air admission hole 43 that communicates with air intake duct 118 is arranged on it, the air admission hole end has retaining wall 44, and the control valve rear axle is to outstanding corresponding mutually boss 47 and flange 49, and bonnet 14 is pressed on boss, the flange, butt hole is arranged in the boss, can be by positive passage 144 on rotation connection air admission hole 43 and the bonnet 14 or contrary passage 145.The area of butt hole is less than the area of retaining wall, form between boss and the flange one can with the exhaust recess 40 of exhaust duct 117 conductings on the shell 11.The control valve rear portion also is provided with connector 45, the jack 46 that band flank 461 is arranged in the connector 45, the connecting rod front end has shape and jack 46 corresponding plug 53 intercalations in jack, be arranged with leakproof ring 52 on the round rod segment 51 of connecting rod, tail end has keyway 511, rotating seat 6 is rotatably mounted on the bonnet 14, the register hole 61 that plugs for the connecting rod afterbody is arranged on it, an outstanding tight fit snaps in the prominent key 62 in the keyway 511 on the register hole 61, rotating seat radially is provided with groove 63, the ball 66 that spring 65 is arranged in the groove and shored by spring is provided with several locating grooves 148 with groove 63 corresponding female on the bonnet 14, and ball 66 can snap in the locating groove.

As Fig. 2, Fig. 3, shown in Figure 5, the butt hole 48 of control valve 4 is seasonable with 145 pairs in the contrary passage of bonnet 14 in the utility model, gas is entered by the air intake duct of shell 11, through air admission hole 43, butt hole 48 enters contrary passage 145, contrary guide channel 142, enter by the reverse through hole 123 on the rear bearing block 121 again and drive the rotor reverse in the transmission mechanism 12, and pass sub postrotational gas most of directly by the inblock cylinder in the transmission mechanism to exhaust duct 117, the gas that small part produces back pressure enters positive guide channel 141 by just changeing through hole 122, positive passage 144 enters exhaust recess 40, is discharged by the exhaust duct on the shell 11 117 again.And rotation rotating seat 6, drive connecting rod 5 and control valve 4 rotations, the contrary passage 145 of script gross area correspondence is staggered, with butt hole 48 by changing both corresponding areas, the air inflow that enters against passage 145 through control pore valve 4 can be changed, thereby air tool reverse rotating speed can be adjusted.

As Fig. 3, Fig. 4, shown in Figure 6, when pneumatic tool was just being changeed, only need rotation rotating seat 6 made butt hole 48 and positive passage 144 corresponding the getting final product on the control valve 4.

Arrangements for speed regulation of the present utility model are when air inlet, because the aperture of butt hole 48 dwindles suddenly from air admission hole 43 ends, therefore the gas pressure that is entered by air admission hole 43 can affact on the retaining wall 44, and on the bonnet that whole control valve is closely pressed together on, because the contact portion of control valve and bonnet only is the leading edge of boss 47, flange 49 and connector 45, thereby contact area is little, when admission pressure acts on large-area retaining wall 44, between control valve and bonnet, can obtain bigger pressure, thereby the utility model also has leak preventing effect preferably.

Claims (5)

1. A speed regulating device for a pneumatic tool, characterized in that it includes an air control valve (4), a connecting rod (5) and a rotating seat (6), and the air control valve (4) is installed in the housing (11). In the air inlet (118) parallel to the upper chamber (111), there is an air inlet (43) communicating with the air inlet (118) on it; platform (47) and flange (49), the back cover is pressed on the boss and the flange, and there is a butt hole (48) in the boss, which can communicate with the positive guide on the air inlet (43) and the back cover (14). groove (141) or reverse guide groove (142), and form an exhaust recess (40) that can communicate with the exhaust passage (117) on the casing (11) between the boss (47) and the flange (49). ), the rear part of the air control valve (4) is affixed to one end of the connecting rod (5) through the protruding connector (45), and the other end of the connecting rod (5) passes through the back cover (14) and is affixed to the rotating seat (6), The swivel seat (6) is rotatably fixed on the back cover (14). 2. A speed regulating device for pneumatic tools according to claim 1, characterized in that: there is a socket (46) with side wings (461) inside the connector (45), and the front end of the connecting rod (5) has a shape that matches the The corresponding plug (53) of the jack (46) is embedded in the jack (46). 3. A speed regulating device for pneumatic tools according to claim 1, characterized in that: there is a keyway (511) at the tail end of the connecting rod (5), and a protruding key (62) on the swivel seat (16) is embedded in the inside the keyway. 4. The speed regulating device of a pneumatic tool according to claim 1, characterized in that: the rotary seat (6) is radially provided with a groove (63), and there is a spring (65) in the groove and is supported by the spring. The ball (66) on the back cover (14) is provided with several locating grooves (148) correspondingly recessed with the groove (63), and the ball (66) can snap into the locating groove. 5. A speed regulating device for pneumatic tools according to any one of claims 1 or 4, characterized in that there is a retaining wall (44) at the end of the air inlet (43) in the air control valve (4), The area of the blocking wall is greater than the area of the butt hole (48).

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