A motor reversing control device for pneumatic tools

Abstract

The present invention discloses a motor reversing control device for a pneumatic tool, comprising a housing, a cylinder, and a motor rotor assembly; a reversing device connected to the cylinder is arranged in the housing, the reversing device comprises a valve seat, a reversing valve stem, a reversing seat, a forward button, and a reverse button; the valve seat is respectively provided with a valve stem mounting hole, a forward air groove, and a reverse air groove; the valve seat is provided with an air inlet hole; the reversing valve stem is matched and installed in the valve stem mounting hole, and its end is positioned and connected with the reversing seat, and the reversing seat is positioned and connected with the end cover, and can slide horizontally along the reversing valve stem; a venting groove is arranged on the reversing valve stem, and the reversing seat moves horizontally to drive the connected reversing valve stem to rotate, and the air inlet hole is correspondingly communicated with the forward air groove or the reverse air groove through the rotation of the venting groove; the forward button and the reverse button are connected with the reversing seat, and a translation positioning device is arranged on the reversing seat. The present invention is easy to operate when reversing, and the structural design connection can reduce the power loss of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of pneumatic tools, and in particular to a motor reversing control device used on pneumatic tools. Background Art

[0002] Pneumatic tools use high-pressure gas to drive the internal pneumatic motor to rotate, thereby providing torque to link the power output shaft connected to the motor to work. They are easy and quick to use, with safe and reliable performance. They are widely used in modern production and life, among which pneumatic wrenches are the most widely used.

[0003] The reversing valve is an essential structural component for the motor in the pneumatic tool to achieve reversing. It controls the flow direction and flow rate of the gas in the pneumatic tool to control its rotation direction and power. The existing reversing valve device structure design makes the reversing operation inconvenient and inflexible to use. In addition, due to the complex design of the air intake reversing gas path, the power of the motor is reduced, which affects the operation and use of the pneumatic tool. Summary of the invention

[0004] The purpose of the present invention is to solve the problems raised in the above background technology and to provide a motor reversing control device for pneumatic tools, which is convenient for reversing operation and reduces motor power loss.

[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is as follows: a motor reversing control device for a pneumatic tool comprises a housing, a cylinder, and a motor rotor assembly, wherein an air inlet passage and an exhaust passage are arranged in the housing, and a forward air inlet passage and a reverse air inlet passage are arranged in the cylinder, and an end cover is connected to the end; a reversing device connected to the cylinder is arranged in the housing, and the reversing device comprises a valve seat, a reversing valve stem, a reversing seat, a forward button, and a reverse button, and the valve seat is respectively provided with a valve stem mounting hole, and a forward air groove and a reverse air groove respectively communicated with the valve stem mounting hole, and the valve seat is provided with a valve stem mounting hole. An air intake hole connecting the air intake channel and the valve stem mounting hole is provided; the reversing valve stem is matched and installed in the valve stem mounting hole, and its end portion is positioned and connected with the reversing seat, the reversing seat is positioned and connected with the end cover, and can slide horizontally along it, and a ventilation groove is provided on the reversing valve stem, and the reversing seat moves horizontally to drive the connected reversing valve stem to rotate, thereby driving the ventilation groove to rotate to realize the corresponding communication between the air intake hole and the forward air groove or the reverse air groove; the forward button and the reverse button are connected with the reversing seat through the shell, and a translation positioning device is provided on the reversing seat.

[0006] A gear adjustment device is connected to the shell, and the gear adjustment device includes an adjusting knob, a gear adjustment gasket, a gear valve stem, a gear spring, and a gear adjustment shifting block; the gear valve stem is inserted into the positive air groove, and a positioning block is provided in the positive air groove, and the gear spring and the gear adjustment shifting block are respectively located on both sides of the positioning block, and the gear spring is sleeved on the gear valve stem, and the gear adjustment shifting block is connected to the end of the gear valve stem and moves with it to change the size of the air intake gap in the positive air groove; an adjusting inclined surface is provided on the adjusting knob, and the gear adjustment gasket is provided with a bent shape and a symmetrical adjusting top plate, one of which can be kept in contact with the gear valve stem, and the gear adjustment gasket is positioned and fixed on the cylinder and forms a contact with the adjusting knob, and the rotating adjusting knob can change the position of the adjusting top plate on the gear adjustment gasket through the adjusting inclined surface, thereby changing the contact position of the gear valve stem.

[0007] The shell comprises a mounting portion and a handle portion, and the forward button and the reverse button are respectively arranged corresponding to the handle portions of the shell.

[0008] The end cover is provided with a positioning connection groove, and the reversing seat is provided with a positioning connection ear connected to the positioning connection groove. The reversing seat is connected to the end cover through the positioning connection ear and can slide along the positioning connection groove through the positioning connection ear. The translation positioning device slides synchronously with the reversing seat.

[0009] The translational positioning device includes a positioning spring and a positioning cylindrical pin. The reversing seat is provided with a mounting hole for installing the translational positioning device. The positioning connecting groove and the end surface corresponding to the translational positioning device are provided with a positioning boss. The translational positioning device moves horizontally with the reversing seat, and the positioning boss presses against the positioning cylindrical pin and compresses the positioning spring, so that the positioning cylindrical pin can be positioned on both sides of the positioning boss respectively.

[0010] The valve seat is respectively provided with a forward secondary exhaust hole and a reverse secondary exhaust hole, the cylinder is respectively provided with a forward secondary intake and exhaust passage and a reverse secondary intake and exhaust passage, and the reversing valve stem is provided with a reversing secondary exhaust hole; the forward secondary intake and exhaust passage and the reverse secondary intake and exhaust passage are respectively communicated with the forward air groove and the reverse air groove, when the ventilation groove on the reversing valve stem corresponds to the forward air groove, the reverse air intake passage and the reverse secondary intake and exhaust passage are communicated with the reverse secondary exhaust hole at the reverse air groove, when the ventilation groove on the reversing valve stem corresponds to the reverse air groove, the forward air intake passage and the forward secondary intake and exhaust passage are communicated with the forward secondary exhaust hole at the forward air groove through the reversing secondary exhaust hole.

[0011] The reversing seat is symmetrically provided with button connecting slots, and the ends of the forward button and the reverse button are respectively provided with elastic buckle protrusions that can be buckled in the button connecting slots; the reversing seat and the reversing valve stem are respectively provided with corresponding positioning columns and positioning slots.

[0012] The adjustment inclined surface is provided with a plurality of gear adjustment positioning grooves, the adjustment top plate is provided with gear adjustment positioning protrusions which can correspond to the gear adjustment positioning grooves, and the shell is provided with gear marks at the corresponding adjustment knobs, and the gear marks correspond to the gear adjustment positioning grooves respectively.

[0013] A sealing gasket is arranged between the valve seat and the cylinder.

[0014] A cylinder gasket is arranged between the connection between the cylinder and the end cover.

[0015] By adopting the above technical solution, the present invention has the following beneficial effects:

[0016] The reversing device in the present invention is installed at the bottom of the cylinder, between the cylinder and the shell. By operating and controlling the rotation of the reversing valve stem, the gas in the intake channel can be directly switched to enter the forward intake channel or the reverse intake channel in the cylinder, thereby driving the Ada rotor assembly in the cylinder to rotate forward or reversely. The reversing device in the present invention more directly controls the gas to enter the cylinder, reduces the loss during the gas entry process, and thus reduces the power loss of the motor.

[0017] When the reversing device adopted in the present invention performs reversing operation control, the reversing seat can be moved by pressing the forward button and the reverse button to drive the reversing valve stem to rotate and easily realize the reversing operation; and the forward button and the reverse button are respectively arranged corresponding to the handle part of the shell. When in use, the forward button and the reverse button can be pressed by the thumb and index finger holding the handle, which is very easy to operate.

[0018] The present invention has a gear adjustment device installed on the shell, which is very convenient for directly adjusting the air intake size of the forward air slot in the reversing device, thereby controlling the gear adjustment of the forward rotation direction of the motor, and is very easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional structural diagram of the present invention;

[0020] Figure 2 is a stereogram of the present invention;

[0021] Figure 3 is an exploded view of the present invention;

[0022] Figure 4 is a three-dimensional diagram of the housing in the present invention;

[0023] Figure 5 is a three-dimensional diagram of the cylinder in the present invention;

[0024] Figure 6 It is a three-dimensional diagram of the cylinder in another direction of the present invention;

[0025] Figure 7 It is an assembly structure diagram between the reversing device and the gear adjustment device in the present invention;

[0026] Figure 8 is a three-dimensional diagram of the end cover of the present invention;

[0027] Fig. 9 is a three-dimensional diagram of the valve seat in the present invention;

[0028] Fig.10 is a three-dimensional diagram of the adjustment knob of the present invention;

[0029] Fig.11 It is a stereoscopic diagram of the mid-gear position adjusting gasket of the present invention. DETAILED DESCRIPTION

[0030] The present invention will be further described in conjunction with the accompanying drawings.

[0031] Please refer to Figures 1 to 11 As shown, the present invention provides a motor reversing control device for a pneumatic tool, comprising a housing 1, a cylinder 2, and a motor rotor assembly 3. The cylinder 2 is installed in the housing 1, and the motor rotor assembly 3 is arranged in the cylinder 2. An air intake channel 4 and an exhaust channel 5 are arranged in the housing 1. A forward air intake channel 6 and a reverse air intake channel 7 are arranged in the cylinder 2, and an end cover 8 is connected to the end. The cylinder 2 is made of a special aluminum alloy material to reduce the weight of the tool, and a special chemical plating treatment is used on the surface to improve the surface hardness and wear resistance. A reversing device connected to the cylinder 2 is arranged in the housing 1, and the reversing device includes a valve seat 9, a reversing valve stem 10, a reversing seat 11, a forward button 12, and a reverse button 13. The valve seat 9 is respectively provided with a valve stem mounting hole 14, and a valve stem mounting hole 14 is respectively provided with a valve stem mounting hole 14. The forward air groove 15 and the reverse air groove 16 are connected to each other, and the valve seat 9 is provided with an air inlet hole 17 connecting the air inlet channel 4 and the valve stem mounting hole 14; the reversing valve stem 10 is matched and installed in the valve stem mounting hole 14, and its end is positioned and connected with the reversing seat 11, and the reversing seat 11 is positioned and connected with the end cover 8 and can slide horizontally along it, and the reversing valve stem 10 is provided with a ventilation groove 18, and the reversing seat 11 moves horizontally to drive the connected reversing valve stem 10 to rotate, thereby driving the ventilation groove 18 to rotate to realize the corresponding communication between the air inlet hole 17 and the forward air groove 15 or the reverse air groove 16; the forward button 12 and the reverse button 13 pass through the shell 1 to be connected with the reversing seat 11, and the two are symmetrically arranged on both sides of the shell, and the reversing seat 11 is provided with a translation positioning device 51.

[0032] When the pneumatic tool needs to be used for forward rotation, the forward button 12 is pressed, the reversing seat 11 is pushed to move, and the reversing valve stem 10 is driven to rotate. The rotation of the reversing valve stem 10 at this time makes the ventilation groove 18 thereon correspond to the forward air groove 15, so that the air intake hole 17 is connected with the forward air intake passage 6 on the cylinder 2. At this time, the switch button device 19 on the shell 1 is pressed to control the high-pressure gas in the air intake passage 4 to enter the cylinder 2 through the air intake hole 17, the ventilation groove 18, the forward air groove 15, and the forward air intake passage 6 in turn to drive the motor rotor assembly 3; when the pneumatic tool needs to be used for reverse rotation, the reverse button 13 is pressed, the reversing seat 11 is pushed to move, and the reversing valve stem 10 is driven to rotate. The rotation of the reversing valve stem 10 at this time makes the ventilation groove 18 thereon correspond to the reverse air groove 16, so that the air intake hole 17 It is connected with the reverse air inlet 7 on the cylinder 2. At this time, by pressing the switch button device 19 on the shell 1, the high-pressure gas in the air inlet channel 4 can be controlled to enter the cylinder 2 through the air inlet hole 17, the air groove 18, the reverse air groove 16, and the reverse air inlet 7 in sequence to drive the motor rotor assembly 3; an exhaust hole 52 is provided on the cylinder 2. Regardless of whether it is forward rotation or reverse rotation, the high-pressure gas o entering the cylinder 2 will pass through the exhaust hole 52 into the exhaust channel 5 for discharge. The design principle of the exhaust structure is the conventional design structure in the existing pneumatic tools, so it will not be elaborated here; however, the setting position of the exhaust hole 52 is biased towards the side of the forward air inlet 6, so that the forward working rotation angle distance of the motor rotor is smaller than the reverse working rotation angle distance, so that the positive and reverse output torques of the motor have a significant difference, that is, the designed reverse torque is greater than the forward torque.

[0033] Furthermore, the housing 1 is connected with a gear adjustment device, which includes an adjustment knob 25, a gear adjustment gasket 20, a gear valve stem 21, a gear spring 22, and a gear adjustment shift block 23; the gear valve stem 21 is inserted into the positive air groove 15, a positioning block 24 is provided in the positive air groove 15, the gear spring 22 and the gear adjustment shift block 23 are respectively located on both sides of the positioning block 24, the gear spring 22 is sleeved on the gear valve stem 21, and the gear adjustment shift block 23 is connected to the end of the gear valve stem 21 and moves with it to change the air intake clearance in the positive air groove 15. Size; the adjusting knob 25 is provided with an adjusting bevel 26, the gear adjusting gasket 20 is provided with a bent shape and a symmetrical adjusting top plate 27, one of the adjusting top plates 27 can be kept against the gear valve stem 21, the gear adjusting gasket 20 is positioned and fixed on the cylinder 2, the bent part of the gear adjusting gasket 20 and the adjusting top plate 27 are respectively against the side of the cylinder 2 and the adjusting bevel 26, rotating the adjusting knob 25 can change the position of the adjusting top plate 27 on the gear adjusting gasket 20 through the adjusting bevel 26, thereby changing the abutting position against the gear valve stem 21.

[0034] The gear adjustment device can adjust the gear for the forward operation of the pneumatic tool. By turning the adjusting knob 25, the adjusting inclined surface 26 thereon can be used to change the abutting position of the adjusting top plate 27 on the gear adjustment gasket 20, thereby adjusting the top plate 27 to change the position of the gear valve stem 21 in the valve seat 9. The movement of the gear valve stem 21 will drive the gear adjustment shift block 23 in the forward air groove 15 to move, thereby changing the size of the air intake gap in the forward air groove 15 and realizing the adjustment of the air intake gear. In the process of the gear adjustment movement of the gear valve stem 21, the gear spring 22 will be compressed, and the elastic force generated by its compression is used to reset the gear valve stem 21 during the adjustment process.

[0035] Furthermore, the shell 1 includes a mounting portion 28 and a handle portion 29, and the forward button 12 and the reverse button 13 are respectively arranged corresponding to the handle portion 29 of the shell 1; so that when performing a reversing operation control, the thumb and index finger holding the handle portion 29 can press the forward button 12 and the reverse button 13, which is very convenient to operate.

[0036] Furthermore, a positioning connecting groove 30 is provided on the end cover 8, and a positioning connecting ear 31 connected to the positioning connecting groove 30 is provided on the reversing seat 11. The reversing seat 11 is connected to the end cover 8 through the positioning connecting ear 31. At the same time, after being positioned and installed with the end cover 8, the side of the reversing seat 11 and the side of the end cover 8 form a fitting and positioning abutment; when performing a reversing operation, the forward button 12 or the reverse button 13 is pressed, and the reversing seat 11 is pushed to slide along the positioning connecting groove 30 through the positioning connecting ear 31, thereby driving the reversing valve stem 10 to rotate for reversing switching control; when the reversing seat 11 moves for reversing control, the translation positioning device thereon will slide synchronously with the reversing seat 11 to achieve positioning after reversing.

[0037] Specifically, the translation positioning device 51 includes a positioning spring 32 and a positioning cylindrical pin 33. The reversing seat 11 is provided with a mounting hole 34 for installing the translation positioning device 51. The positioning connecting groove 30 is provided with a positioning boss 35 on the end surface corresponding to the translation positioning device. When the reversing seat 11 moves for reversing control, the translation positioning device moves horizontally with it. In the process of moving with the reversing seat, the positioning cylindrical pin 33 of the translation positioning device 51 will be pressed against the positioning boss 35 when passing through it. When the positioning cylindrical pin 33 is pressed against, the positioning spring 32 will be compressed, thereby moving over the positioning boss 35 and being on one side of the positioning boss 35, thereby positioning the reversing seat 11 after the reversing movement is completed. At the same time, the completion of the reversing operation can also be sensed by the pressing of the translation positioning device 51 against the positioning boss 35 during the movement.

[0038] Furthermore, the valve seat 9 is provided with a forward auxiliary exhaust hole 38 and a reverse auxiliary exhaust hole 39, the cylinder 2 is provided with a forward auxiliary intake and exhaust passage 36 and a reverse auxiliary intake and exhaust passage 37, and the reversing valve stem 10 is provided with a reversing auxiliary exhaust hole 40; when in use, when the motor of the pneumatic tool rotates forward, the venting groove 18 on the reversing valve stem 10 corresponds to the forward air groove 15, and the intake air in the forward air groove 15 enters the air groove 15 through the forward intake passage 6 and the forward auxiliary intake and exhaust passage 36. The motor rotor rotates forward in the cylinder, and the reversing secondary exhaust hole 40 on the reversing valve stem 10 is connected with the reverse secondary exhaust hole 39, so that when the pneumatic tool is used in the forward direction, in addition to exhausting through the exhaust hole 52, the reverse secondary intake and exhaust passage 37 and the reverse intake passage 7 are exhausted at the reverse air groove 16 through the corresponding communication between the reversing secondary exhaust hole 40 and the reverse secondary exhaust hole 39, and finally discharged through the exhaust passage 5; when the motor of the pneumatic tool rotates in the reverse direction, the reversing valve stem 1 0, the upper vent groove 18 corresponds to the reverse air groove 16, and the intake air in the reverse air groove 16 enters the cylinder through the reverse air intake passage 7 and the reverse auxiliary air intake and exhaust passage 37, so that the motor rotor rotates in the opposite direction. At this time, the reversing auxiliary exhaust hole 40 on the reversing valve stem 10 is connected with the positive auxiliary exhaust hole 38, so that when the pneumatic tool is used in the reverse direction, in addition to being exhausted through the exhaust hole 52, it will also be exhausted through the positive auxiliary air intake and exhaust passage 36 and the positive air intake passage 6 at the positive air groove 15 through the corresponding communication between the reversing auxiliary exhaust hole 40 and the positive auxiliary exhaust hole 38, and finally discharged through the exhaust passage 5; when used in the forward or reverse rotation, the auxiliary intake air of the positive auxiliary air intake and exhaust passage 36 and the reverse auxiliary air intake and exhaust passage 37 on the cylinder 2 causes the blades in the motor rotor assembly to be thrown away in time at the moment of tool startup. At the same time, as the reversing valve stem controls the switching direction of the intake, the auxiliary exhaust system formed effectively prevents the high-pressure gas retained after the switching from causing a reverse force on the motor rotor assembly 3, thereby reducing power loss.

[0039] Specifically, the reversing seat 11 is symmetrically provided with button connecting slots 41, and the ends of the forward button 12 and the reverse button 13 are respectively provided with elastic snap-fitting protrusions 42 that can be snapped into the button connecting slots 41; when the forward button 12 and the reverse button 13 are connected to the reversing seat 11, the elastic snap-fitting protrusions 42 can be snapped into the button connecting slots 41 by pressing and applying force, and disassembly and assembly are relatively convenient; the reversing seat 11 and the reversing valve stem 10 are respectively provided with corresponding positioning columns 47 and positioning cards 48, so that when the reversing seat 11 moves, the reversing valve stem 10 is driven to rotate by matching the positioning columns 47 and the positioning cards 48.

[0040] Furthermore, a plurality of gear adjustment positioning grooves 43 are provided on the adjustment inclined surface 26, a gear adjustment positioning protrusion 44 corresponding to the gear adjustment positioning groove 43 is provided on the adjustment top plate 27, and a gear mark (not shown in the figure) is provided at the corresponding adjustment knob 25 on the shell 1, and the gear mark corresponds to the gear adjustment positioning groove 43 respectively; thereby, the size of the adjustment can be clearly known when the gear adjustment is performed.

[0041] Furthermore, a sealing gasket 45 is provided between the valve seat 9 and the cylinder 2, thereby effectively ensuring the sealing of the connection between the valve seat and the cylinder.

[0042] Furthermore, a cylinder gasket 46 is provided between the connection between the cylinder 2 and the end cover 8. The cylinder gasket 46 plays a role of wear resistance, the motor power is not easily reduced, and the service life is increased.

[0043] The above is a detailed introduction to a motor reversing control device for a pneumatic tool provided by an embodiment of the present invention. Specific examples are used herein to illustrate the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the technical solution disclosed by the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be understood as a limitation of the present invention.

Claims

1. A motor reversing control device for a pneumatic tool, comprising a housing, a cylinder, and a motor rotor assembly, wherein an air intake passage and an exhaust passage are provided in the housing, a forward air intake passage and a reverse air intake passage are provided in the cylinder, and an end cap is connected at the end; characterized in that: A reversing device connected to the cylinder is arranged in the shell, and the reversing device includes a valve seat, a reversing valve stem, a reversing seat, a forward button, and a reverse button. The valve seat is respectively provided with a valve stem mounting hole, and a forward air groove and a reverse air groove respectively communicated with the valve stem mounting hole. The valve seat is provided with an air intake hole communicating with the air intake channel and the valve stem mounting hole; the reversing valve stem is matched and installed in the valve stem mounting hole, and its end is positioned and connected with the reversing seat, the reversing seat is positioned and connected with the end cover, and can slide horizontally along the reversing valve stem; a ventilation groove is arranged on the reversing valve stem, and the reversing seat moves horizontally to drive the connected reversing valve stem to rotate, thereby driving the ventilation groove to rotate to realize that the air intake hole is correspondingly communicated with the forward air groove or the reverse air groove; the forward button and the reverse button are connected with the reversing seat through the shell, and a translation positioning device is arranged on the reversing seat; A gear adjustment device is connected to the shell, and the gear adjustment device includes an adjusting knob, a gear adjustment gasket, a gear valve stem, a gear spring, and a gear adjustment shifting block; the gear valve stem is inserted into the positive air groove, and a positioning block is provided in the positive air groove, and the gear spring and the gear adjustment shifting block are respectively located on both sides of the positioning block, and the gear spring is sleeved on the gear valve stem, and the gear adjustment shifting block is connected to the end of the gear valve stem and moves with it to change the size of the air intake gap in the positive air groove; an adjusting inclined surface is provided on the adjusting knob, and the gear adjustment gasket is provided with a bent shape and a symmetrical adjusting top plate, one of which can be kept in contact with the gear valve stem, and the gear adjustment gasket is positioned and fixed on the cylinder and forms a contact with the adjusting knob, and the rotating adjusting knob can change the position of the adjusting top plate on the gear adjustment gasket through the adjusting inclined surface, thereby changing the contact position of the gear valve stem.

2. A motor reversing control device for a pneumatic tool according to claim 1, characterized in that: The shell comprises a mounting portion and a handle portion, and the forward button and the reverse button are respectively arranged corresponding to the handle portions of the shell.

3. A motor reversing control device for a pneumatic tool according to claim 1, characterized in that: The end cover is provided with a positioning connection groove, and the reversing seat is provided with a positioning connection ear connected to the positioning connection groove. The reversing seat is connected to the end cover through the positioning connection ear and can slide along the positioning connection groove through the positioning connection ear. The translation positioning device slides synchronously with the reversing seat.

4. A motor reversing control device for a pneumatic tool according to claim 3, characterized in that: The translational positioning device includes a positioning spring and a positioning cylindrical pin. The reversing seat is provided with a mounting hole for installing the translational positioning device. The positioning connecting groove and the end surface corresponding to the translational positioning device are provided with a positioning boss. The translational positioning device moves horizontally with the reversing seat, and the positioning boss presses against the positioning cylindrical pin and compresses the positioning spring, so that the positioning cylindrical pin can be positioned on both sides of the positioning boss respectively.

5. A motor reversing control device for a pneumatic tool according to claim 1, characterized in that: The valve seat is respectively provided with a forward secondary exhaust hole and a reverse secondary exhaust hole, the cylinder is respectively provided with a forward secondary intake and exhaust passage and a reverse secondary intake and exhaust passage, and the reversing valve stem is provided with a reversing secondary exhaust hole; the forward secondary intake and exhaust passage and the reverse secondary intake and exhaust passage are respectively communicated with the forward air groove and the reverse air groove, when the ventilation groove on the reversing valve stem corresponds to the forward air groove, the reverse air intake passage and the reverse secondary intake and exhaust passage are communicated with the reverse secondary exhaust hole at the reverse air groove, when the ventilation groove on the reversing valve stem corresponds to the reverse air groove, the forward air intake passage and the forward secondary intake and exhaust passage are communicated with the forward secondary exhaust hole at the forward air groove through the reversing secondary exhaust hole.

6. A motor reversing control device for a pneumatic tool according to claim 4, characterized in that: The reversing seat is symmetrically provided with button connecting slots, and the ends of the forward button and the reverse button are respectively provided with elastic buckle protrusions that can be buckled in the button connecting slots; the reversing seat and the reversing valve stem are respectively provided with corresponding positioning columns and positioning slots.

7. A motor reversing control device for a pneumatic tool according to claim 1, characterized in that: The adjustment inclined surface is provided with a plurality of gear adjustment positioning grooves, the adjustment top plate is provided with gear adjustment positioning protrusions which can correspond to the gear adjustment positioning grooves, and the shell is provided with gear marks at the corresponding adjustment knobs, and the gear marks correspond to the gear adjustment positioning grooves respectively.

8. A motor reversing control device for a pneumatic tool according to claim 1, characterized in that: A sealing gasket is arranged between the valve seat and the cylinder.

9. A motor reversing control device for a pneumatic tool according to claim 1, characterized in that: A cylinder gasket is arranged between the connection between the cylinder and the end cover.

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