TWI411501B - Pneumatic tool drive direction and flow control device - Google Patents

Abstract

The present invention relates to a driving direction and flow rate control device of pneumatic tool comprising a rear mask cover, a direction control knob, a flow rate control knob, and an intake valve base. The rear mask cover comprises a knob hole, a fitting tube, an intake port, at least one inversion exhaust, and a forward exhaust. The direction control knob is combined with the fitting tube of the rear mask cover in a pressing manner and comprises a rotary shaft and a pressing handle. The intake valve base is combined with the rear mask cover and the flow rate control knob and is a level base body, in which an internal diameter is gradually expanded from a rear end toward a front end. It comprises a rear section portion, a middle section portion, a front section portion, a forward intake channel, a communication slot, and an inversion intake channel. Accordingly, a driving direction and flow rate control device of pneumatic tool capable of being conveniently switched, having multi-staged flow rate control, and stable operation is further provided.

Description

Pneumatic tool driving direction and flow control device

The present invention relates to a driving direction and flow control device, and more particularly to a pneumatic tool driving direction and flow control device.

The existing pneumatic tools are mainly driven by gas, and the components such as bolts or nuts are loosened or fastened, which is quite convenient and fast to use. Therefore, the existing pneumatic tools are widely used; please refer to FIG. 10 and 11, the conventional pneumatic tool 70 is provided with a casing 71, a cylinder block 72, an intake valve seat 73 and a knob 74. The casing 71 is provided with a chamber, a grip 711 and a The rear cover 712 is disposed at a lower portion of the housing 71, and the rear cover 712 is disposed at a rear of the housing 71 and communicates with the grip 711 and the chamber. The cylinder block 72 The system is disposed in the housing of the housing 71 and is provided with a forward air passage and a reverse air passage. The intake valve seat 73 is disposed in the rear cover 712 and is provided with a forward air inlet passage 731 and a reverse rotation. An intake passage 732, the forward intake passage 731 is in communication with a forward air passage of the cylinder block 72, the reverse intake passage 732 is in communication with a reverse air passage of the cylinder block 72; the knob 74 is rotatably Combined with the housing 71, between the intake valve seat 73 and the rear cover 712, the knob 74 is between the front side system A main air hole 741 and two flow regulating holes 742 are disposed through the main air hole 741 to selectively communicate with the forward air inlet passage 731 or the reverse air intake passage 732 of the intake valve seat 74 as shown in FIGS. 12 and 13 . Each of the flow regulating holes 742 can communicate with the forward air intake passage 731 of the intake valve seat 73, so that the existing pneumatic tool 70 can be operated through the switch 74, so that the knob 74 can pass through the switch 74. The gas valve seat 73 has an intake passage 731, 732 communicating with the forward or reverse air passage of the cylinder block 72, thereby allowing the rotor in the cylinder block 72 to generate a forward rotation (clockwise rotation) relative to the cylinder or Inverting (counterclockwise rotation) operation; further, the existing pneumatic tool 70 can provide two flow adjustment holes 742 communicating with the intake valve seat 73 of the intake valve seat 73 through the knob 74, so that the existing pneumatic tool 70 The output force of different fastening effects can be provided (3-stage type); however, the existing pneumatic tool 70 can provide a function of loosening or tightening the nut or bolt by turning the knob 74, but the existing pneumatic tool 70 To switch by using the knob 74 with the other hand, you can switch The operation of loosening or locking the sub-steering is relatively inconvenient in operation; further, the existing pneumatic tool 70 can provide different output powers by providing two flow regulating holes 742, but only three kinds of power can be provided. The output force of different fastening effects relatively limits the applicability of the pneumatic tool 70, and when the two flow regulating holes 742 are used for the adjustment of the output power, since the flow rate of the high pressure gas provided by the external air compressor is a certain value, it is redundant. The high-pressure gas cannot be efficiently and quickly discharged outside the casing 71, so that the gas cannot flow stably in the pneumatic tool 70, thereby affecting the fluency of the existing pneumatic tool 70, and there are improvements.

In order to improve the structure and operation of the above-mentioned existing pneumatic tools, the object of the present invention is to provide a pneumatic tool driving direction and flow control device that can be easily switched, multi-stage flow control and stable operation.

Based on the above object, the technical means used in the present invention is to provide a pneumatic tool driving direction and flow control device, which is disposed in a pneumatic tool and includes a rear cover, a directional control button, a flow control knob and a An intake valve seat, wherein: the rear cover is provided with a knob hole, a set of tubes, an air inlet, at least one reverse air outlet and a forward air outlet, and the knob hole extends through the rear cover a rear side surface, the sleeve is laterally convexly formed at a bottom portion of the rear cover near the rear side, the air inlet is penetrated through the front side of the rear cover near the bottom, and the at least one reverse air outlet is radially a rear cover that is adjacent to the front side and communicates with the air inlet and the sleeve, the forward air outlet is formed at the bottom of the rear cover and between the at least one reverse air outlet and the knob hole The forward air outlet is in communication with the air inlet and the sleeve; the direction control button is pressably coupled with the sleeve of the rear cover and is provided with a rotating shaft and a pressing handle, the rotating shaft Rotatingly disposed in the sleeve tube of the rear cover, The outer surface of the shaft near the middle portion is recessed with a flow groove communicating with the air inlet and the reverse air outlet or with the air inlet and the forward air outlet, and a hole for closing the reverse air outlet or a closing surface of the positive air outlet, the pressing handle is fixedly coupled with the rotating shaft, so that the rotating shaft can rotate relative to the sleeve tube after the pressing of the pressing handle; the flow control knob is rotatably a rotating handle is disposed in the knob hole of the rear cover, and the rotating handle is formed on the rear side of the flow control knob and is exposed outside the rear cover through the knob hole; and the intake valve seat is Combined with the rear cover and the flow control knob, and being a stepped body whose inner diameter is gradually enlarged from the rear end toward the front end, which is provided with a rear section, a middle section, a front section, and a forward rotation An air passage, a communication slot and a reverse air inlet, the rear portion is sleeved on the front side of the flow control knob and has a space with the wall cover of the rear cover provided with the forward air outlet, the middle portion The sleeve is sleeved on the front side of the rear cover and the outer surface is opposite to each other The air outlet is facing, the front portion extends out of the front side of the rear cover, and the forward air inlet extends through the rear side of the middle portion and the front side of the front portion, and is spaced behind the intake valve seat The space between the portion and the rear cover is communicated with the forward air outlet, and the communication groove is recessed on the outer surface of the middle portion and communicates with each of the reverse air outlets of the rear cover. The front section and the middle section are in communication with the communication slot.

Further, the flow control knob is provided with a flow regulating hole having a tapered elongated hole in the radial direction of the front side. The intake valve seat is provided with an air vent and a shunting channel, wherein the air vent is through the air inlet. An outer surface of the rear portion of the valve seat and communicating with the flow regulating hole, a space between the rear portion of the intake valve seat and the rear cover, and the forward air outlet, and the flow passage penetrates the outer surface of the front portion And passing through the middle portion toward the rear to communicate with the flow regulating hole and the air adjusting hole.

Further, the flow control knob has a positioning block facing the flow regulating long hole in the axial direction of the front side, and the positioning block is recessed with a receiving groove on a side different from the flow regulating hole. An elastic member and a positioning bead are disposed in the receiving groove, and the inner surface of the rear portion of the rear portion is curvedly convexly disposed with a positioning rail abutting the flow control knob positioning block. The positioning track is spaced apart by a plurality of positioning grooves that abut against the positioning block positioning beads.

Preferably, the rear cover is provided with a plurality of flow marks and two steering indicator marks on the rear side of the knob hole, and the number of positioning grooves of the positioning track is the number of flow marks of the rear cover. Corresponding.

Preferably, the two free ends of the rotating shaft extend out of the sleeve tube and are respectively provided with a locking column, and the pressing handle is fixedly coupled with the two locking columns of the rotating shaft.

Preferably, the rear cover is provided with two spaced reverse air outlets.

With the above technical means, the pneumatic tool driving direction and flow control device of the present invention has at least the following advantages and effects:

1. Convenient switching: In the operation of the steering of the pneumatic tool, it is only necessary to press the directional control button to press the handle by one hand, and then the inlet and the reverse rotation of the inlet and the intake valve seat can be switched The way in which the air inlets communicate with each other can easily change the direction of rotation of the pneumatic tool, thereby locking or loosening the nut or bolt, and the operation is quite convenient and efficient.

Second, multi-stage flow control: by setting a tapered flow adjustment hole on the flow control knob, the flow control knob can be rotated to adjust the area of the flow adjustment hole and the air-conditioning hole, thereby providing The multi-stage output power of the pneumatic tool greatly improves the applicability of pneumatic tools.

3. Stable operation: through the air distribution hole, the flow regulating hole and the spatial arrangement of the flow dividing channel, part of the high pressure gas may pass through the air adjusting hole of the air inlet valve seat, the flow adjusting hole of the flow control knob, and the The shunt passage of the intake valve seat flows into the housing of the pneumatic tool, thereby quickly discharging the pneumatic tool, thereby avoiding interference effects on the high pressure gas in the pneumatic tool.

In order to understand the technical features and practical effects of the present invention in detail, and in accordance with the contents of the specification, further detailed embodiments as shown in the following figures (as shown in FIGS. 1 to 3) will be described in detail as follows: The pneumatic tool driving direction and flow control device provided by the invention is disposed in a pneumatic tool 50. The pneumatic tool 50 is provided with a casing 51 and a cylinder block 52, wherein the casing 51 is provided with a gun body portion 511 and a grip portion 512 is disposed in the body portion 511 of the housing 51 and located above the grip portion 512 and is provided with a forward air passage and a reverse air passage. The device is provided with a rear cover 10, a directional control button 20, a flow control knob 30 and an intake valve seat 40, wherein the rear cover 10 is detachably attached to the body portion 511 of the housing 51. The ends are combined and provided with a knob hole 11, a set of tubes 12, an air inlet 13, at least one reverse air outlet 14 and a forward air outlet 15, the front side of the rear cover 10 is attached to the housing The rear end surface of the 51 is fixedly coupled, and the knob hole 11 extends through the rear side of the rear cover 10, and the sleeve 12 is Formed at a bottom portion of the rear cover 10 near the rear side, the air inlet 13 extends through the front side of the rear cover 10 near the bottom and communicates with the grip portion 512 of the housing 51; the at least one The reverse air outlet 14 extends radially through the rear cover 10 adjacent to the front side and communicates with the air inlet 13 and the sleeve tube 12. Preferably, the rear cover 10 is provided with two spaced reverses. The air outlet 14 is formed at the bottom of the rear cover 10 and between the at least one reverse air outlet 14 and the knob hole 11, and the forward air outlet 15 is connected to the air inlet 13 and the sleeve tube 12 are in communication. Further, the rear cover 10 is spaced apart from the rear side of the knob hole 11 to form a plurality of flow marks 16 and two turn indication marks 17; please refer to FIG. 4 The directional control button 20 is detachably coupled to the sleeve tube 12 of the rear cover 10 and is provided with a rotating shaft 21 and a pressing handle 22, wherein the rotating shaft 21 is rotatably disposed on the rear cover In the sleeve tube 12 of the 10, the outer surface of the rotating shaft 21 near the middle portion is recessed with the air inlet 13 and the reverse air outlet 14 or a gas flow port 13 and a flow passage 23 communicating with the forward air outlet 15 and a closing surface 24 for closing each of the reverse air outlets 14 or the forward air outlets 15, and the two free ends of the rotating shaft 21 respectively extend out of the sleeve A locking column 25 is disposed outside the tube 12; the pressing handle 22 is fixedly coupled with the two locking posts 25 of the rotating shaft 21, so that the rotating shaft 21 can be opposite to the pressing handle 22 The sleeve tube 12 is rotated, and the flow channel 23 of the rotating shaft 21 is communicated with the air inlet 13 and the reverse air outlet 14 or with the air inlet 13 and the forward air outlet 15; As shown in FIGS. 3 and 5, the flow control knob 30 is rotatably disposed in the knob hole 11 of the rear cover 10 and is provided with a rotating handle 31, a flow regulating hole 32 and a positioning block 33. The rotating handle 31 is provided. Formed on the rear side of the flow control knob 30 and exposed outside the rear cover 10 via the knob hole 11, the flow regulating hole 32 is a tapered long hole and radially penetrates the flow. The front side of the control knob 30 is axially protruded from the front side of the flow control knob 30 and is adjusted to the flow rate. The positioning block 33 is recessed on a side of the flow regulating hole 32, and a receiving groove 331 is disposed in the receiving groove 331; and an elastic member 34 and a positioning bead 35 are disposed in the receiving groove 331; Referring to FIGS. 3, 5 and 6, the intake valve seat 40 is coupled to the rear cover 10 and the flow control knob 30 and abuts the cylinder block 52 of the pneumatic tool 50. The valve seat 40 is a stepped body whose inner diameter is gradually enlarged from the rear end toward the front end and is provided with a rear section 41, a middle section 42, a front section 43, an air vent 44, a positioning rail 45, and a positive a transfer port 46, a communication groove 47, a reverse intake port 48 and a flow dividing passage 49, wherein the rear portion 41 of the intake valve seat 40 is sleeved on the front side of the flow control knob 30 and The rear cover 10 is provided with a space on the wall of the forward air outlet 15 , and the middle portion 42 of the intake valve seat 40 is sleeved on the front side of the rear cover 10 and the outer surface thereof is reversed. The air outlets 14 face each other, and the front portion 43 of the intake valve seat 40 extends out of the front side of the rear cover 10 and is disposed in the body portion 511 of the housing 51 and is associated with the cylinder block 52. The air venting hole 44 extends through the outer surface of the rear portion 41 of the intake valve seat 10 and the flow regulating hole 32 of the flow control knob, the rear portion 41 of the intake valve seat 40, and the rear cover 10 The space between the space and the forward air outlet 15 is arcuately protruded from the inner surface of the rear portion 41 of the intake valve seat 10 and abuts against the positioning block 33 of the flow control knob 30. The positioning rail 45 is provided with a plurality of positioning recesses 451 corresponding to the positioning beads 35 of the positioning block 33, wherein the number of the positioning recesses 451 corresponds to the number of the flow marks 16 of the rear cover 10; The forward rotation intake passage 46 extends through the rear side surface of the middle portion 42 of the intake valve seat 40 and the front side surface of the front portion 43 and the space between the rear portion 41 of the intake valve seat 10 and the rear cover portion 10 The forward air outlet 15 and the forward air passage of the cylinder group 52 are communicated, and the communication groove 47 is recessed on the outer surface of the middle portion 42 of the intake valve seat 40 and the reverse air outlet of the rear cover 10 14 intersecting, the reversing air inlet 48 extends through the front portion 43 and the middle portion 42 of the intake valve seat 40 and the communication groove 47 and the cylinder group 52 The air passage is communicated, and the flow passage 49 extends through the outer surface of the front portion 43 of the intake valve seat 40 and extends through the middle portion 42 and the flow regulating hole 32 of the flow control knob 30, the air passage 44 and the shell. The body portion 511 of the body 51 communicates.

When the pneumatic tool driving direction and the flow control device of the present invention are in the locking operation, please refer to the as shown in FIGS. 3, 4 and 7 to pass the grip portion 512 of the pneumatic tool 50 and an air compressor through a pipeline for conveying gas. (not shown) are connected so that the high pressure gas generated by the air compressor can be delivered to the grip portion 512 of the pneumatic tool 50 via the pipeline. When the user holds the grip portion 512 of the pneumatic tool 50 with the right hand, The high pressure gas is introduced into the air inlet 13 of the rear cover 10 via the grip portion 512 by pressing the pneumatic tool trigger by the thumb, wherein the rotation of the shaft 21 is not performed when the pressing handle 22 is not pressed downward. The surface 24 closes each of the reverse air outlets 14 of the rear cover 10, and the flow groove 23 of the rotating shaft 21 communicates with the air inlet 13 and the forward air outlet 15 at the same time, so that high pressure gas can pass through the flow channel. 23 and the forward air outlet 15 enter the space between the rear portion 41 of the intake valve seat 40 and the rear cover 10; please refer to FIG. 2, FIG. 5 and FIG. When the high pressure gas enters the space between the rear portion 41 of the intake valve seat 40 and the rear cover 10, part The high pressure gas enters the forward air passage of the cylinder group 52 via the forward rotation air passage 46 of the intake valve seat 40, thereby causing the rotor located in the cylinder group 52 to rotate clockwise. The pneumatic tool 50 locks the nut or bolt, and part of the high pressure gas passes through the air vent 44 of the intake valve seat 40, the flow regulating hole 32 of the flow control knob 30, and the shunt of the intake valve seat 40. The passage 49 flows into the housing 51 of the pneumatic tool 50, thereby quickly discharging the pneumatic tool 50, thereby avoiding interference effects on the high pressure gas in the pneumatic tool 50, allowing the pneumatic tool 50 to smoothly perform the locking operation; According to the above technical means, the spatial arrangement of the air venting hole 44, the flow regulating hole 32 and the flow dividing channel 49 can adjust the tapered flow regulating hole 32 and the venting hole not only by rotating the flow control knob 30. The size of the 44-phase communication, and thus the flow of gas into the forward-rotating air passage of the cylinder group 52 via the forward-running intake passage 46 of the intake valve seat 40, can conveniently provide the output of the multi-section of the pneumatic tool 50. power The utility model can greatly improve the applicability of the pneumatic tool; furthermore, as shown in FIGS. 2 and 3, in the process of adjusting the gas flow rate, the operator can position the positioning bead 35 and the positioning rail 45 through the positioning block 33. The groove 451 abuts and the rotating handle 31 cooperates with each flow mark 16 to accurately and conveniently control the output power of the pneumatic tool; when the user drives the direction and flow control device by the pneumatic tool of the present invention, the retracting operation is performed. When referring to FIG. 3 and FIG. 8 , when the user holds the grip portion 512 of the pneumatic tool 50 with the right hand, the pressing shaft 22 only needs to be pressed downward by the thumb, so that the rotating shaft 21 follows The pressing handle 22 that swings downward is rotated relative to the sleeve tube 12, so that the closing surface 24 of the rotating shaft 21 abuts against the forward rotation air outlet 15 of the rear cover 10, so that the circulation groove 23 and the rear The reverse air outlets 14 of the cover are in communication. At this time, when the operator presses the trigger of the air tool 50, the high pressure gas located in the grip portion 512 passes through the air inlet 13, the flow channel 23, and the respective inversions. Entering the air outlet 14 and the reverse air inlet 48 In the reverse air passage of the cylinder group 52, the rotor is rotated counterclockwise with respect to the cylinder block 52, so that the pneumatic tool 50 can be retracted against the nut or the bolt.

According to the above technical means, the pneumatic tool driving direction and flow control device of the present invention can switch the rotating shaft by pressing the directional control button 20 by pressing the shank 22 with one hand by hand. 21 The flow channel 23 communicates with the forward rotation port 46 and the reverse air inlet 48 of the intake valve seat 40, so that the rotation direction of the pneumatic tool 50 can be easily changed, thereby locking the nut or the bolt. Or the loosening operation is quite convenient and efficient in operation; further, by setting a tapered flow regulating hole 32 on the flow control knob 30, the flow rate can be adjusted by rotating the flow control knob 30. The size of the area of the adjusting hole 32 communicating with the air adjusting hole 44 further provides the output power of the pneumatic tool 50 in multiple stages, greatly improving the applicability of the pneumatic tool, and further transmitting the air adjusting hole 44, the flow regulating hole 32 and the shunting channel. The spatial arrangement of 49 allows a portion of the high pressure gas to pass through the venting opening 44 of the intake valve seat 40, the flow regulating hole 32 of the flow control knob 30, and the branching of the intake valve seat 40. The passage 49 flows into the housing 51 of the pneumatic tool 50 to quickly discharge the pneumatic tool 50, thereby avoiding interference effects on the high pressure gas in the pneumatic tool 50, thereby providing a convenient switching, multi-stage flow control, and stable operation. The pneumatic tool drives the direction and flow control device.

The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any one of ordinary skill in the art can use the present invention without departing from the scope of the present invention. Equivalent embodiments of the invention may be made without departing from the technical scope of the present invention.

10. . . Rear cover

11. . . Knob hole

12. . . Set pipe

13. . . Air inlet

14. . . Reverse air outlet

15. . . Positive air outlet

16. . . Traffic tag

17. . . Steering indicator

20. . . Direction control

twenty one. . . Rotating shaft

twenty two. . . Pressing handle

twenty three. . . Flow channel

twenty four. . . Closed surface

25. . . Locking column

30. . . Flow control knob

31. . . Rotary handle

32. . . Flow adjustment hole

33. . . Positioning block

331. . . Capacity slot

34. . . Elastic part

35. . . Positioning beads

40. . . Intake valve seat

41. . . Rear section

42. . . Middle section

43. . . Front section

44. . . Air vent

45. . . Positioning track

451. . . Positioning groove

46. . . Forward inlet

47. . . Connecting slot

48. . . Reverse inlet

49. . . Split channel

50. . . Pneumatic tool

51. . . case

511. . . Gun body

512. . . Grip

52. . . Cylinder group

70. . . Pneumatic tool

71. . . case

711. . . Grip

712. . . Rear cover

72. . . Cylinder group

73. . . Intake valve seat

731. . . Forward air intake

732. . . Reverse intake passage

74. . . Knob

741. . . Main air hole

742. . . Flow adjustment hole

1 is a perspective view of the present invention mounted on a pneumatic tool.

Figure 2 is a perspective exploded view of the present invention.

Figure 3 is another perspective exploded view of the present invention.

Figure 4 is a partial cross-sectional side elevational view of the present invention mounted on the pneumatic tool.

Figure 5 is a side elevational view, partly in section, of the present invention mounted on the pneumatic tool.

Figure 6 is a partial cross-sectional plan view of the present invention mounted on the pneumatic tool.

Figure 7 is a side elevational view (forward rotation) of the operation of the present invention.

Figure 8 is a side elevational view (reverse view) of the operation of the present invention.

Figure 9 is a perspective view showing the appearance of a conventional pneumatic tool.

Figure 10 is a partial exploded perspective view of a prior art pneumatic tool.

Figure 11 is a partial cross-sectional side view of a prior pneumatic tool.

Figure 12 is a side elevational view (forward rotation) of an existing pneumatic tool.

Figure 13 is a side elevational view (reverse view) of the prior art pneumatic tool.

10. . . Rear cover

16. . . Traffic tag

17. . . Steering indicator

20. . . Direction control

twenty two. . . Pressing handle

30. . . Flow control knob

31. . . Rotary handle

50. . . Pneumatic tool

51. . . case

511. . . Gun body

512. . . Grip

Claims (7)

A pneumatic tool driving direction and flow control device is disposed in a pneumatic tool and includes a rear cover, a directional control button, a flow control knob and an intake valve seat, wherein: the rear cover is provided with a knob hole a set of tubes, an air inlet, at least one reverse air outlet and a forward air outlet, the knob hole is extending through the rear side of the rear cover, and the sleeve is laterally convexly formed on the rear cover The cover is near the bottom of the rear side, the air inlet is through the front side of the rear cover near the bottom, and the at least one reverse air outlet extends radially through the rear cover near the front side and the air inlet and the air inlet The sleeve is connected to the bottom of the rear cover and is disposed between the at least one reverse air outlet and the knob hole, the forward air outlet and the air inlet and the sleeve The directional control button is detachably coupled to the sleeve tube of the rear cover and is provided with a rotating shaft and a pressing handle, and the rotating shaft is rotatably disposed in the sleeve tube of the rear cover. The rotating shaft is concavely disposed on the outer surface near the middle portion, and the air inlet and each a transfer port or a flow channel communicating with the air inlet and the forward air outlet; and a closing surface for closing each of the reverse air outlets or the forward air outlet, the pressing handle is fixedly coupled with the rotating shaft The rotating shaft is rotatable relative to the sleeve tube after the pressing of the pressing handle; the flow control knob is rotatably disposed in the knob hole of the rear cover and is provided with a rotating handle Forming on the rear side of the flow control knob and exposing to the outside of the rear cover through the knob hole; and the intake valve seat is combined with the rear cover and the flow control knob and is an inner diameter system The stepped body gradually expanding toward the front end, and is provided with a rear section, a middle section, a front section, a forward rotation inlet, a communication slot and a reverse intake port, and the rear section is sleeved a wall cover on the front side of the flow control knob and the rear cover is provided with a space for the forward air outlet, the middle portion is sleeved on the front side of the rear cover and the outer surface thereof is reversed The gas port faces, the front section protrudes from the front side of the rear cover, The rotary inlet system extends through the rear side surface of the middle portion and the front side of the front portion, and communicates with the space between the rear portion of the intake valve seat and the rear cover and the forward air outlet, the communication slot The inner surface of the middle portion is recessed and communicates with each of the reverse air outlets of the rear cover. The reverse air inlet penetrates the front and middle portions and communicates with the communication groove. The pneumatic tool driving direction and flow control device according to claim 1, wherein the flow control knob is provided with a flow regulating hole having a tapered long hole in a radial direction of the front side, and the intake valve seat is provided with a tone. a venting hole and a shunting passage, wherein the venting opening penetrates an outer surface of the rear portion of the intake valve seat and a space between the flow regulating hole, the rear portion of the intake valve seat and the rear cover, and the forward rotation The air outlets communicate with each other, and the flow passage passes through the outer surface of the front section and penetrates the middle section rearward to communicate with the flow regulating hole and the air conditioning hole. The pneumatic tool driving direction and the flow rate control device according to claim 2, wherein the flow control knob has a positioning block facing the flow regulating long hole in the axial direction of the front side, and the positioning block is different from the positioning block. One side of the flow regulating hole is recessed with a receiving groove, and an elastic member and a positioning bead are disposed in the receiving groove, and the inner surface of the rear portion is curved and convexly arranged on the inner surface of the rear portion The flow control knob positions the positioning rails on which the blocks abut, and the positioning rails are recessed with a plurality of positioning grooves that abut against the positioning block positioning beads. The driving direction and flow control device of the pneumatic tool according to claim 3, wherein the rear cover is spaced apart from the rear side of the knob hole to form a plurality of flow marks and two steering indicator marks, and the positioning of the positioning track The number of grooves corresponds to the number of flow marks of the rear cover. The pneumatic tool driving direction and flow control device according to any one of claims 1 to 4, wherein the two free ends of the rotating shaft respectively extend outside the sleeve tube and are respectively provided with a locking column, the pressing handle system The two locking columns of the rotating shaft are fixedly combined. The pneumatic tool driving direction and flow control device according to claim 5, wherein the rear cover is provided with two spaced-apart reverse air outlets. The pneumatic tool driving direction and flow control device according to claim 1, wherein the rear cover is provided with two spaced-apart reverse air outlets.