TW201440965A - Pneumatic tool using pressing lever to switch forward/reverse rotation - Google Patents

Abstract

This invention relates to a pneumatic tool using pressing lever to switch the forward/reverse rotation, comprising a main casing, at least an outer air discharge hole, a cylinder, a forward rotation air inlet passage, a reverse rotation air inlet passage, a rotor set, an actuation front sleeve, an air discharge ring groove, a forward/reverse rotation integration control valve, a back pressure release passage, and a side-rotatable butterfly type pressing lever. The side rotatable butterfly type pressing lever is pivotally assembled to one side of the main casing upper end by an erect axle bolt to enable the side-rotatable butterfly type pressing lever to perform the side swinging using the axle bolt as a fulcrum and have a first pressing position and a second pressing position. When being rotated to the first pressing position, the side-rotatable butterfly type pressing lever can be aligned to abut against the forward rotation pressed end to constitute the forward rotation mode which makes the forward rotation brake valve lever open for air-intaking; and when being rotated to the second pressing position, the side-rotatable butterfly type pressing lever can be aligned to abut against the reverse rotation pressed end to constitute the reverse rotation mode which makes the reverse rotation brake valve lever open for air-intaking. Accordingly, the user can use a single hand to operate the pneumatic tool for quickly switching the forward/reverse rotation, so as to achieve the practical progressiveness of greatly enhancing the usage convenience, work efficiency while having aesthetics and better operation comfort.

Description

Pneumatic tool for positive reversal by pressing the handle

The present invention relates to a pneumatic tool; and more particularly to an innovative pneumatic tool structural design that is reversed by a press shank.

According to the different functions of the pneumatic tools, they are further subdivided into various types, such as pneumatic gears, pneumatic wrenches, pneumatic saws, pneumatic grinders, pneumatic nail guns, etc., among them with loose and lock functions (such as For pneumatic gears, pneumatic wrenches, etc., the structure design must be equipped with a positive reversing switching device, in order to change the working end of the steering to meet different usage requirements.

According to the above, the design of the forward reversing switching device of the conventional pneumatic tool is usually achieved by setting a switching knob at the position of the body of the pneumatic tool different from the pressing handle. However, this type of structure The following problems still exist:

1. The setting of the switching button causes the appearance of the pneumatic tool body to form a convex uneven portion, thereby increasing the obstacle discomfort when the user grips the hand.

2. When the user wants to operate the reverse switching function, the other hand must be used to control the switching button, and the hand that originally held the body and the pressing handle cannot be directly manipulated, thus causing the reverse switching operation. There are still problems with poor convenience and affecting work efficiency.

Therefore, in view of the problems existing in the above-mentioned conventional pneumatic tools, how to develop an innovative structure that can be more ideal and practical, and the relevant industry should further consider the goals and directions of breakthrough.

In view of this, the inventor has been engaged in the manufacturing development and design experience of related products for many years, and has designed and prudently targeted the above objectives. After the evaluation, the invention is finally practical.

The main object of the present invention is to provide a pneumatic tool that is reversed by pressing a handle, and the problem to be solved is to solve the problem of how to develop a new pneumatic tool with more ideal practicability.

The technical feature of the present invention is mainly that the pneumatic tool comprises: a main housing, in the form of a hollow shell, comprising an upper end, a lower end and a holding section between the upper and lower ends The upper end is provided with an air inlet joint, and the main housing is provided with an upper receiving portion and a lower receiving portion disposed at an upper and lower interval, the upper receiving portion is in communication with the air inlet joint, and the lower receiving portion is The utility model comprises a top wall, a peripheral wall and a lower opening, and a partition wall is formed between the upper and lower accommodating portions; at least one external venting hole is opened at one side of the holding section of the main casing; The utility model is disposed in the lower accommodating portion of the main casing, and includes a cylinder chamber and a cylinder wall, and the upper end of the cylinder is sealed with an end seat. The end of the end seat is provided with a bearing portion, and one side of the cylinder wall is provided with a diameter a through-opening internal venting hole; a forward-rotating intake passage, in a vertical extension type, the lower end of which penetrates into the cylinder chamber of the cylinder, and the upper end sequentially passes through the cylinder wall, the end seat, and the partition wall to penetrate into the upper chamber a reversed intake passage that is in a vertical extension and is open to the forward intake In a spaced relationship, the reverse end of the intake passage penetrates into the cylinder chamber of the cylinder, and the upper end passes through the cylinder wall, the end seat and the partition wall in sequence, and penetrates to the upper receiving portion; a rotor group is in a rotatable state a rotor chamber is disposed in the cylinder chamber of the cylinder, the rotor assembly includes an upper convex shaft, a lower drive shaft and a plurality of blades of the spacer ring row, wherein the upper convex shaft is pivotally disposed on a bearing portion of the end seat of the cylinder; The tube is disposed at a lower end of the main casing, and includes a hammering rotating shaft and a driven portion for interlocking the hammering acting shaft, the driven portion is connected upward to the lower driving shaft of the rotor group and can be driven by the rotor group An exhaust ring groove is disposed between the outer wall of the cylinder and the peripheral wall of the lower receiving portion in a lateral annular space type, and The exhaust hole and the inner exhaust hole respectively communicate with the exhaust ring groove; a positive reverse integrated control valve is disposed in the upper housing portion of the main housing, and mainly includes a valve seat and a forward rotation brake valve stem Reversing the brake valve stem, wherein the valve seat set is located in the upper accommodating portion, the valve seat is horizontally disposed with a positive rotation valve groove and a reverse valve groove, and the forward rotation valve groove is connected to the upper accommodating portion and The positive rotation air passage is forwarded, and the reverse valve groove is connected to the upper receiving portion and the reverse air inlet passage, and the forward rotation brake valve rod is set in the forward rotation valve opening and closing state, and the forward rotation brake valve rod has a positive The pressing end is protruded out of the valve seat, and the reversing brake valve rod is set in the reverse valve opening and closing state, and the reverse brake valve rod has a reverse pressing end protruding from the valve seat, and A reset element is disposed between the positive and reverse brake valve stems and the upper receiving portion to reset the actuator; a back pressure discharge passage is in a vertical extension type and is between the positive and reverse intake passages. The lower end of the back pressure discharge passage is penetrated through the cylinder wall of the cylinder and communicates with the exhaust ring groove, and the back pressure discharge The upper end of the track passes through the end seat and the partition wall and penetrates to the upper receiving portion, so that the valve seat of the positive reversing integrated control valve is provided with a back pressure draining guide hole, and the lower end of the back pressure draining guide hole is connected to the back pressure draining and discharging. The upper end of the passage and the back draining guide hole communicates with the forward rotary valve groove and the reverse valve groove at the same time; a butterfly-shaped pressure handle can be turned sideways, and the top end is pivoted on the upper end side of the main casing by a vertical shaft bolt The laterally-turnable butterfly-type shank can have a first pressing position and a second pressing position with the shaft bolt as a fulcrum, and the side-turning butterfly-type shank is turned to the first pressing In position, the position can be reversed to the positive pressure receiving end to form a forward rotation mode in which the forward rotation brake valve lever is opened, and when the butterfly type pressure handle can be turned to the second pressing position, the position can be reversed. Reversing the pressure receiving end to form a reverse rotation mode in which the brake valve stem is turned on; and wherein the forward rotation brake valve stem and the reverse rotation brake valve stem are respectively provided with a back pressure blocking portion, and the back pressure blocking portion can be in the positive Blocking the forward rotation when the brake valve stem is pressed to open the intake state The connection state of the groove or the reversing valve groove and the back pressure drainage hole; thereby, the innovative and unique design enables the user to perform the reverse rotation switching by one hand with a single hand to quickly control the pneumatic tool according to the prior art, thereby greatly increasing the use. Convenience, work efficiency and There is no need to additionally set the switch button to have both practical and better operational comfort.

A‧‧‧ pneumatic tools

10‧‧‧Main housing

11‧‧‧Upper

12‧‧‧Bottom

13‧‧‧ Holding section

14‧‧‧Intake joint

15‧‧‧上容部

16‧‧‧ Lower Housing Department

17‧‧‧ top wall

18‧‧‧Wall

19‧‧‧ opening

20‧‧‧ partition wall

21‧‧‧External vents

22‧‧‧ cylinder

23‧‧‧Cylinder room

24‧‧‧Cylinder wall

25‧‧‧Terrace

26‧‧‧ Bearing Department

27‧‧‧Internal vents

28‧‧‧ Radial grooves

30‧‧‧ Forward air intake

40‧‧‧Reversing the intake passage

50‧‧‧Rotor group

51‧‧‧Upper axis

52‧‧‧lower drive shaft

53‧‧‧ blades

55‧‧‧Before acting casing

56‧‧‧ hammering action shaft

57‧‧‧Received Department

58‧‧‧Exhaust ring groove

60‧‧‧Reversing integrated control valve

61‧‧‧ valve seat

62‧‧‧ forward valve slot

63‧‧‧Reverse valve slot

64‧‧‧ Forward brake valve stem

641‧‧‧ Forward to the end

65‧‧‧Reverse brake valve stem

651‧‧‧Reversing the compression end

66‧‧‧Reset components

67‧‧‧Return pressure block

70‧‧‧Repressed drainage channel

71‧‧‧Return draining guide hole

80‧‧‧ can turn side butterfly type handle

81‧‧‧ shaft bolt

82‧‧‧First pressing position

83‧‧‧Second pressing position

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of a preferred embodiment of the present invention.

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

Figure 3 is another side perspective view of the end block of the present invention.

Figure 4 is an enlarged perspective view of the cylinder of the present invention.

Figure 5 is a partial cross-sectional view of the present invention in an open intake forward mode.

Fig. 6 is a cross-sectional view taken along line B-B of Fig. 5.

Figure 7 is a cross-sectional view taken along line C-C of Figure 5.

Figure 8 is a schematic view of the gas flow path of the present invention in an open intake forward mode.

Figure 9 is a cross-sectional view showing the operation of the present invention in an open air intake reversal mode.

Figure 10 is a cross-sectional view of the cylinder of the present invention in an open intake reversal mode.

Figure 11 is a schematic view of the gas flow path of the present invention in an open air intake reversal mode.

Fig. 12 is a schematic view showing the flow path of the present invention for discharging the air pressure generated by the reverse reversal through the back pressure discharge passage.

Please refer to the first, second, third, fourth, and fifth figures, which are preferred embodiments of the present invention for switching a positively reversed pneumatic tool by a press shank, but the embodiments are for illustrative purposes only, and are on the patent application. It is not limited by this structure; the pneumatic tool A includes the following structure: a main casing 10 having a hollow casing type, including an upper end 11 and a lower end 12, and between the upper and lower ends 11, a holding area between 12 The upper end 11 is provided with an air inlet joint 14, and the main housing 10 is provided with an upper receiving portion 15 and a lower receiving portion 16 which are disposed at an upper and lower intervals, and the upper receiving portion 15 and the air inlet portion The lower receiving portion 16 includes a top wall 17, a peripheral wall 18 and a lower opening 19, and a partition wall 20 is formed between the upper and lower receiving portions 15, 16; at least one external venting opening 21 The cylinder 22 is received in the lower receiving portion 16 of the main casing 10, and includes a cylinder chamber 23 and a cylinder wall 24, and the cylinder is disposed at a side of the holding portion 13 of the main casing 10. The upper end seal group of 22 has an end seat 25, and a bearing portion 26 is disposed at the center of the end seat 25, and one side of the cylinder wall 24 is provided with a radially through inner vent hole 27 (detailed in Fig. 4); The intake passage 30 is in a vertical extension type, and the lower end thereof penetrates to the cylinder chamber 23 of the cylinder 22, and the upper end sequentially passes through the cylinder wall 24, the end seat 25, and the partition wall 20 to penetrate the upper receiving portion 15 (for example). FIG. 5 is a reversal of the intake passage 40 in a vertical extension configuration and spaced apart from the forward rotation intake passage 30, the lower end of the reverse intake passage 40 being connected to the cylinder 22 The cylinder chamber 23 has an upper end that passes through the cylinder wall 24, the end seat 25, and the partition wall 20 in sequence, and penetrates to the upper receiving portion 15 (as shown in FIGS. 2 and 6); a rotor group 50 is in a rotatable state. Provided in the cylinder chamber 23 of the cylinder 22, the rotor assembly includes an upper convex shaft 51, a lower drive shaft 52, and a plurality of blades 53 of the spacer ring row, wherein the upper convex shaft 51 is pivotally assembled to the end seat 25 of the cylinder 22. The bearing portion 26 is disposed; the front sleeve 55 is disposed at the lower end 12 of the main housing 10, and includes a hammering shaft 56 and a driven portion 57 for interlocking the hammering shaft 56. The driven portion 57 The upper drive shaft 52 is coupled upwardly to the rotor assembly 50 and can be driven by the rotor assembly 50; wherein the hammering action shaft 56 can be positioned by a predetermined tool assembly; an exhaust ring groove 58 is transversely annular. State in steam The outer wall of the cylinder wall 24 of the cylinder 22 and the peripheral wall 18 of the lower receiving portion 16 , and the outer exhaust hole 21 and the inner exhaust hole 27 are correspondingly connected to the exhaust ring groove 58 (as shown in Figure 7); A positive reversing integrated control valve 60 is disposed in the upper housing portion 15 of the main housing 10, and mainly includes a valve seat 61, a forward rotation brake valve lever 64, and a reverse brake valve lever 65. The valve seat 61 The group setting is located in the upper accommodating portion 15. The valve seat 61 is disposed with a positive-rotation valve groove 62 and a reverse valve groove 63 disposed at intervals. The normal-rotation valve groove 62 is connected to the upper accommodating portion 15 and is rotated forward. The gas passage 30, the reverse valve groove 63 is connected to the upper receiving portion 15 and the reverse intake passage 40, and the forward rotation brake valve rod 64 is disposed in the forward rotation valve groove 62 in an advanceable and retractable opening and closing state, and the forward rotation brake valve rod 64 a forward rotation pressure receiving end 641 protrudes out of the valve seat 61, and the reverse brake valve rod 65 is disposed in the reverse valve opening and closing state in the reverse rotation opening and closing state, and the reverse rotation brake valve 65 has a reverse compression end. The 651 is protruded from the outside of the valve seat 61, and a reset element 66 is disposed between the positive and reverse brake valve stems 64, 65 and the upper receiving portion 15 to reset the actuator; a back pressure drain passage 70 The vertical extension type is between the positive and reverse intake passages 30, 40. The lower end of the back pressure discharge passage 70 passes through the cylinder wall 24 of the cylinder 22 and communicates with the exhaust ring groove 58 for back pressure. The upper end of the drain passage 70 is sequentially passed through the end seat 25 and the partition wall 20 to penetrate the upper receiving portion 15 so that the valve seat 61 of the forward reversing integrated control valve 60 is provided with a back pressure draining guide hole 71, which is discharged. The lower end of the guide hole 71 is connected to the back pressure discharge passage 70, and the upper end of the back pressure discharge guide hole 71 is connected to the forward rotation valve groove 62 and the reverse valve groove 63 at the same time (please refer to the flow path of Fig. 8); The shank 80 is pivotally assembled on the upper end 11 side of the main casing 10 by a vertical shaft bolt 81. The slidable butterfly shank 80 can be pivoted with the shaft bolt 81 as a fulcrum. The rotary motion has a first pressing position 82 and a second pressing position 83. When the laterally-rotating butterfly-type shank 80 is rotated to the first pressing position 82, the right-handed pressing end 641 can be pressed against the position. The forward rotation brake valve lever 64 is in the forward rotation mode in which the intake air is turned on, and when the laterally-rotating butterfly pressure handle 80 is turned to the second pressing position 83, The positional pressure reverses the pressure receiving end 651 to form a reverse rotation mode in which the reverse brake valve lever 65 is opened; and wherein the forward rotation brake valve lever 64 and the reverse rotation brake valve lever 65 are provided with a back pressure blocking portion 67, which is The pressure blocking portion 67 can block the communication state between the forward rotation valve groove 62 or the reverse rotation valve groove 63 and the back pressure discharge pilot hole 71 when the positive and reverse brake valve levers 64, 65 are in the pressurized open air intake state.

As shown in FIG. 4, a radial groove 28 may be disposed at a lower end of the cylinder wall 24 of the cylinder 22 corresponding to the back pressure relief passage 70 such that the lower end of the back pressure drain passage penetrates downward to the radial recess. Slot 28.

The operating state of the present invention is described as follows: As shown in FIG. 5, if the user wants to start the pneumatic tool A in the forward rotation mode, only the holding section 13 of the main casing 10 and the butterfly can be turned sideways. The handle 80 drives the laterally-actuatable butterfly-type shank 80 to swing laterally to the first pressing position 82 (please refer to the arrow L1 of FIG. 6). At this time, as shown in FIGS. 5 and 6 , the position can be pressed against the forward pressure receiving end 641 to form a forward rotation mode in which the forward rotation brake valve lever 64 is opened (as indicated by the arrow L2 in FIG. 5), and the flow path is further referred to. As shown in Fig. 8, the gas system is sequentially introduced into the forward rotation valve passage 62 and the forward rotation intake passage 30 by the intake joint 14, and then enters the cylinder chamber 23 in the lower receiving portion 16 to push the rotor assembly 50 to rotate in the forward direction. The front sleeve 55 is applied, and then the gas flows into the exhaust ring groove 58 from the inner exhaust hole 27 and is discharged from the outer exhaust hole 21 to constitute the forward rotation mode (please refer to Fig. 7), and The gas accumulated in the cylinder chamber 23 (as indicated by the arrow L3 in Fig. 7, the portion of the rotor group 50 is squeezed to generate an accumulated pressure), which is reversed by the intake air. 40 flows upward into the reverse valve groove 63, and the back pressure blocking portion 67 blocks the communication state between the forward rotation valve groove 62 and the back pressure discharge guide hole 71, and the constituent gas is introduced into the back pressure discharge passage 70 from the back pressure discharge guide hole 71. The pressure relief effect (as shown in Fig. 12), which is discharged downward through the outer vent hole 21, achieves the problem that the rotor group 50 cannot be rotated by avoiding mutual resistance with the intake air.

As shown in Fig. 9, relatively speaking, when the user wants to switch the pneumatic tool A in the reverse mode, it is only necessary to turn the butterfly-type pressure handle 80 horizontally. The side swings to the second pressing position 83 (as indicated by the arrow L4), at which time the positional pressing can reverse the pressure receiving end 651 to form a reversal mode in which the reverse brake valve rod 65 is opened to open the air (eg, 10th) As shown in the figure, the flow path is further disclosed in Fig. 11. The gas system is sequentially introduced into the reverse valve groove 63 by the intake joint 14, reverses the intake passage 40, and then enters the cylinder in the lower receiving portion 16. In the chamber 23, the rotor sleeve 50 is reversely driven to drive the front sleeve 55, and then the gas flows into the exhaust ring groove 58 from the inner exhaust hole 27 and is discharged from the outer exhaust hole 21 to constitute the reverse mode (please refer to the reference 10 is shown), and as shown in Fig. 11, the gas accumulated in the cylinder chamber 23 under pressure (as indicated by the arrow L5 in Fig. 10) flows upward from the forward rotation passage 30 into the forward rotation valve. In the groove 62, the communication state of the reverse valve groove 63 and the back pressure discharge guide hole 71 is blocked by the back pressure blocking portion 67, so that the gas is introduced into the back pressure discharge passage 70 by the back pressure discharge guide hole 71 and is discharged downward from the outside. The pressure relief effect of the venting of the vent 21 (as shown in Fig. 12) is such that the rotor group 50 cannot be rotated by avoiding mutual resistance with the intake air. problem.

In order to integrate the above, in order to enable the user to quickly control the pneumatic tool A with one hand, the positive reversal switching can be performed in addition to the cooperation relationship between the butterfly-type shank 80 and the internal components. The innovative flow path structure design of the pressure discharge passage 70 can be achieved by the method. Otherwise, in the process of actually reversing the switching, the intake air and the internal accumulation pressure will mutually resist each other, and the rotor group 50 will be completely inoperable.

Advantages of the Invention: The "pneumatic tool for positively reversing by pressing the handle" mainly by the main casing, the external exhaust hole, the cylinder, the forward rotation inlet passage, the reverse intake passage, the rotor group, The innovative structural design of the casing, the exhaust ring groove, the positive reversing integrated control valve, the back pressure drainage channel and the laterally-turnable butterfly pressure shank, so that the present invention is compared with the conventional structure proposed in the prior art In this case, the user can quickly switch the pneumatic tool with a one-handed butterfly-type pressing handle to perform positive reversal switching, which greatly increases the convenience of use, work efficiency, and eliminates the need for additional switching buttons to achieve both aesthetic and better operation. Practical and progressive comfort.

The above embodiments are intended to be illustrative of the present invention, and are not to be construed as limiting the scope of the invention. The principles are changed and modified to achieve an equivalent purpose, and such changes and modifications are to be included in the scope defined by the scope of the patent application as described later.

A‧‧‧ pneumatic tools

10‧‧‧Main housing

11‧‧‧Upper

12‧‧‧Bottom

13‧‧‧ Holding section

14‧‧‧Intake joint

15‧‧‧上容部

16‧‧‧ Lower Housing Department

17‧‧‧ top wall

18‧‧‧Wall

20‧‧‧ partition wall

21‧‧‧External vents

22‧‧‧ cylinder

23‧‧‧Cylinder room

24‧‧‧Cylinder wall

25‧‧‧Terrace

26‧‧‧ Bearing Department

27‧‧‧Internal vents

30‧‧‧ Forward air intake

50‧‧‧Rotor group

51‧‧‧Upper axis

55‧‧‧Before acting casing

56‧‧‧ hammering action shaft

60‧‧‧Reversing integrated control valve

61‧‧‧ valve seat

62‧‧‧ forward valve slot

64‧‧‧ Forward brake valve stem

641‧‧‧ Forward to the end

66‧‧‧Reset components

67‧‧‧Return pressure block

80‧‧‧ can turn side butterfly type handle

Claims (2)

The utility model relates to a pneumatic tool which is reversely reversed by a pressure handle, comprising: a main casing, in a hollow shell type, comprising an upper end, a lower end and a holding section between the upper and lower ends; wherein The upper end is provided with an air inlet joint, and the main housing is provided with an upper receiving portion and a lower receiving portion disposed at an upper and lower intervals, the upper receiving portion is in communication with the air inlet joint, and the lower receiving portion includes a top wall, a wall and a lower opening, and a partition wall is formed between the upper and lower accommodating portions; at least one external vent hole is opened at one side of the holding portion of the main casing; The lower housing of the main housing includes a cylinder chamber and a cylinder wall, and the upper end of the cylinder is sealed with an end seat. The end of the end seat is provided with a bearing portion, and one side of the cylinder wall is radially penetrated. The inner venting hole; a forward-rotating air inlet passage, in a vertical extension type, the lower end of which penetrates to the cylinder chamber of the cylinder, and the upper end sequentially passes through the cylinder wall, the end seat and the partition wall to penetrate the upper accommodating portion a reverse intake passage, in a vertical extension and spaced apart from the forward intake passage The lower end of the reverse intake passage penetrates into the cylinder chamber of the cylinder, and the upper end passes through the cylinder wall, the end seat and the partition wall in sequence, and penetrates to the upper receiving portion; a rotor group is rotatably accommodated in the cylinder In the cylinder chamber, the rotor assembly includes an upper convex shaft, a lower drive shaft and a plurality of blades of the spacer ring row, wherein the upper convex shaft is pivotally disposed on a bearing portion of the end seat of the cylinder; Provided at a lower end of the main casing, comprising a hammering rotating shaft and a driven portion for interlocking the hammering action shaft, the driven portion being connected upward to the lower driving shaft of the rotor group to be driven by the rotor group; An exhaust ring groove is disposed between the outer wall of the cylinder and the peripheral wall of the lower receiving portion in a lateral annular space, and the outer exhaust hole and the inner exhaust hole are respectively connected to the exhaust ring groove; The positively reversing integrated control valve is disposed in the upper receiving portion of the main casing, and mainly comprises a valve seat, a forward rotation brake valve stem and a reverse brake valve stem, wherein the valve seat group is set in the upper receiving portion. The valve seat is horizontally disposed with a positive rotation valve groove and a reverse rotation valve groove. The normal rotation valve groove is connected to the upper receiving portion and the forward rotation inlet passage, and the reverse valve groove is connected to the upper receiving portion and reversed. The gas passage, the forward rotation brake valve stem is set in the forward rotation valve slot in the forward and backward rotation and closing state, and the forward rotation brake valve rod has a positive rotation pressure end protruding from the valve seat outside, and the reverse brake valve stem is The retreating and opening and closing state is set in the reversing valve slot, and the reversing brake valve rod has a reverse pressing end protruding from the outside of the valve seat, and the positive and reverse braking valve stem and the upper receiving portion are respectively provided with a reset The component is used to reset the actuator; a back pressure discharge passage is in a vertical extension and is positively and reversely Between the passages, the lower end of the back pressure discharge passage passes through the cylinder wall of the cylinder and communicates with the exhaust ring groove, and the upper end of the back pressure discharge passage sequentially passes through the end seat and the partition wall to penetrate the upper receiving portion. The valve seat of the positive reversing integrated control valve is provided with a back pressure discharge guide hole, the lower end of the back pressure discharge guide hole is connected with the back pressure discharge passage, and the upper end of the back pressure discharge guide hole is simultaneously connected with the forward rotation valve groove and the reverse valve groove; The butterfly-shaped shank can be turned sideways, and the top end is pivoted to the upper end side of the main casing by a vertical shaft bolt, and the side-turning butterfly type shank can be used as a fulcrum for the lateral side yaw The rotary motion has a first pressing position and a second pressing position. When the laterally-turnable butterfly-type pressing handle is turned to the first pressing position, the forward-rotating brake valve stem can be formed by pressing against the forward-rotating pressure-receiving end. The forward rotation mode of the intake air is turned on, and when the butterfly type pressure handle can be turned to the second pressing position, the positional pressure can be reversed to reverse the pressure receiving end, and the reverse rotation mode of the brake valve stem is turned on; Wherein, the forward rotation brake valve stem and the reverse brake valve stem are provided with back pressure a blocking portion capable of blocking the communication state of the forward rotation valve groove or the reverse valve groove and the back pressure discharge guide hole when the positive and reverse brake valve rods are in a pressurized open air intake state, at this time, The reverse valve groove or the forward rotation valve groove that opens the intake air is kept in communication with the back pressure discharge guide hole to achieve the function of the back pressure discharge guide. According to the first aspect of the patent application, the pneumatic tool is switched by the pressing handle, wherein a radial groove is arranged at the lower end of the cylinder wall corresponding to the back pressure discharge passage, so that the lower end of the back pressure discharge passage is Pass down to the radial groove.