TWM623455U - A pneumatic screwdriver - Google Patents

Abstract

This creation relates to a pneumatic screwdriver, including a body. The body is sequentially provided with an air intake assembly, an air intake switch assembly, a forward and reverse rotation control assembly, a pneumatic motor transmission assembly and an impact mechanism, and an intake air switch assembly and a forward and reverse rotation control assembly. The components are respectively longitudinally penetrated in the body and communicated, the impact mechanism is drivingly connected with the air motor transmission component, the air intake switch component is connected with the air intake component, and the forward and reverse rotation control component controls the gas to flow out from different flow passages of the body to make the air motor drive The component rotates forward or reverse, the intake switch component includes a trigger that rotates on the outside of the body, the forward and reverse control component includes a forward and reverse switch, and the forward and reverse switch is movably arranged on the trigger. The creation has a simple structure and convenient operation. The air intake switch assembly and the control parts of the forward and reverse control components are designed in combination. Press the trigger to start the work, and push the forward and reverse switch, which can be operated with one hand. The operation is simple, the operation is more smooth, and the operation efficiency is effectively improved.

Description

a pneumatic screwdriver

This creation relates to the technical field of screwdrivers, especially a pneumatic screwdriver.

Pneumatic screwdrivers, also known as pneumatic screwdrivers, air batches, pneumatic screwdrivers, pneumatic screwdrivers, etc., are pneumatic tools used for tightening and loosening screws, cooling nuts, etc., and are mainly used in various assembly operations. The structure of the existing pneumatic screwdriver is complex. Generally, the trigger is used to control the start of the screwdriver, and the knob is used to control the forward and reverse operation. However, these two structures are generally designed separately at different positions, which are inconvenient to use in actual operation, which will affect the operator's safety. work efficiency.

In order to solve the above problems, this creation provides a pneumatic screwdriver.

In order to achieve the above purpose, the following technical solutions are adopted in this creation: a pneumatic screwdriver, including a body, and the body is sequentially provided with an air intake assembly, an air intake switch assembly, a forward and reverse rotation control assembly, and a pneumatic motor transmission assembly from the back to the front. With the impact mechanism, the air intake switch assembly and the forward/reverse control assembly are respectively longitudinally penetrated and communicated in the body, and the impact mechanism is connected to the pneumatic The motor drive assembly is connected in a drive, the air intake switch assembly is communicated with the air intake assembly, the forward and reverse rotation control assembly controls the gas to flow out from different flow passages of the body to make the air motor drive assembly rotate forward or reverse, the air intake switch The assembly includes a trigger that rotates outside the body, and the forward and reverse rotation control assembly includes a forward and reverse rotation switch, and the forward and reverse rotation switch is movably arranged on the trigger.

(1) Most preferably, the main body is provided with connected threaded holes, a first cavity, a second cavity and an installation cavity in sequence from the back to the front, the inner wall of the installation cavity is provided with several hook grooves, the second cavity is The cavity is communicated with the installation cavity through the forward rotation passage and the reverse rotation passage, the air intake assembly is connected in the threaded hole, the air intake switch assembly is penetrated in the first cavity, and the forward and reverse rotation controls The component is penetrated in the second cavity, and the air motor transmission component is penetrated in the installation cavity.

(2) Preferably, the forward and reverse rotation control assembly further includes a second air plug, a forward and reverse rotation shaft and a forward and reverse rotation shaft sleeve, the second air plug is penetrated at the bottom of the second cavity, and the forward and reverse rotation shaft The side wall of the sleeve is provided with an air inlet, a forward rotation ventilation port and a reverse rotation ventilation port. The air passages correspond to the air passages, the reversing air vents correspond to the air passages of the reversing air passages, the forward and reverse shafts are inserted in the forward and reverse shaft sleeves and elastically abut against the second air plugs through elastic parts, and the positive and negative The top of the rotating shaft is connected with a round pin, which is in contact with the bottom surface of the forward and reverse rotation switches. Outflow from the forward or reverse flow passage.

(3) Preferably, the air intake assembly includes an air intake head, an air intake nozzle and a sound-absorbing cover, the sound-absorbing cover is abutted on the rear end of the main body, and the air intake head is connected to the rear end of the main body through the sound-absorbing cover , the intake nozzle is arranged on the intake head, and the intake head and the intake nozzle are respectively provided with corresponding intake passages.

(4) Preferably, the air intake switch assembly further comprises a first air plug, a valve stem and an air switch valve, The first air plug is connected to the bottom of the first cavity, the trigger is rotatably arranged on the outer wall of the body through a spring pin, the air switch valve is arranged in the first cavity, and the valve rod is inserted through the air switch valve. Inside, its top end is clamped with the trigger, and its bottom end is connected to the first air plug through a spring.

(5) Preferably, the pneumatic motor transmission assembly includes a rear cover, a cylinder, a rotor, a blade, a front cover and a heat dissipation nut, and the front cover and the rear cover are respectively connected to the front and rear ends of the cylinder through spring pins. The side wall of the cylinder is provided with a number of air outlet holes, an installation hole, a first air guide channel and a second air guide channel are axially arranged in the cylinder, and both ends of the cylinder are provided with a first air guide groove and a second air guide groove. Air guide grooves, the first guide air passages run through the first air guide grooves at both ends of the cylinder, the second guide air passages run through the second air guide grooves at both ends of the cylinder, and the rear cover is provided with a first air hole and a second air guide groove. Two air holes, the first air guide groove and the first air hole correspond to the forward rotation air passage, and the second air guide groove and the second air hole correspond to the reverse air passage, The rotor is eccentrically penetrated in the installation hole, and its side wall abuts against the inner wall of the installation hole between the first air guide groove and the second air guide groove to make the air flow in one direction. Blades with different embedded depths, the heat dissipation nut is passed through the hook groove position inside the installation cavity, the inner side of the heat dissipation nut is provided with a circle of slots and a number of guide grooves are distributed. The hexagonal opening in the middle of the cooling nut is connected with the slot, the slot corresponds to the four hook slots on the front side of the inner wall of the body, and the front end of the rotor passes through the front cover and the cooling nut and is driven by the impact mechanism connect.

(6) Most preferably, the impact mechanism includes a cam, an impact block, an impact block holder, an impact rod, a collar, a shaft sleeve and a casing, the casing is connected to the front end of the body, and the impact block holder is located at In the casing, two impact blocks are respectively fixed on the impact block holder by means of a bolt, the cam is arranged at the rear end of the impact block holder and is connected with the air motor transmission assembly, the cam is clamped with the impact block, the The impact rod is penetrated in the impact block bearing seat and is connected with the air motor transmission assembly The collar is pierced through the impact rod, the shaft sleeve is connected to the collar through a gasket, and the front end of the impact rod penetrates the casing and is connected with a detachable pneumatic screwdriver.

The beneficial effects of this pneumatic screwdriver are: the pneumatic screwdriver has a simple structure and is easy to operate. It is designed by combining the intake switch assembly with the control parts (trigger and forward and reverse rotation switch) of the forward and reverse control components. Press the trigger to start the work, and push the forward The reversing switch can be operated and activated with one hand. When the direction of rotation needs to be changed, the operation can be completed with a single push of the finger. The operation is simple, the operation is more convenient, and the operation efficiency is effectively improved.

1: Ontology

11: Air Control Department

111: Forward flow passage

112: Reverse air flow channel

113: first cavity

114: Second cavity

1141: Air intake

1142: Forward rotation vent

1143: Reverse vent

1144: Axial hole

1145: Air vent

1146: Outflow channel

12: Transmission part

121: Installation cavity

1211: Hook groove

13: Threaded holes

131: Through hole

2: Intake components

21: Air intake head

22: muffler cover

3: Intake switch assembly

31: First wind plug

32: Stem

33: Air switch valve

34: Trigger

4: Forward and reverse control components

41: Second wind plug

42: Forward and reverse axis

421: First stop ring

422: Second retaining ring

423: Third retaining ring

43: Forward and reverse shaft sleeve

431: Air intake

432: Forward rotation vent

433: Reverse vent

434: Air outlet

44: Forward and reverse switch

441: The first positioning hole

442: Second positioning hole

45: round pin

5: Air motor drive components

51: Back cover

511: First vent

512: Second vent

52: Cylinder

521: Mounting holes

522: The first guide air channel

523: Second air guide channel

524: The first air guide groove

525: Second air guide groove

526: Air vent

53: Rotor

54: Blades

55: Front cover

56: cooling nut

561: Guide slot

562: Hexagonal opening

563: Slotted

6: Impact mechanism

61: Cam

62: Shock Block

63: Impact block socket

64: Impact bar

65: Collar

66: Bushing

67: Shell

7: Hook

Figure 1 is a three-dimensional schematic diagram of the pneumatic screwdriver.

Figure 2 is the exploded structure diagram of the pneumatic screwdriver.

Figure 3 is a schematic plan view of the pneumatic screwdriver.

FIG. 4 is an A-A cross-sectional view of the forward rotation state of FIG. 3 .

FIG. 5 is a B-B cross-sectional view of the forward rotation state of FIG. 3 .

FIG. 6 is an A-A cross-sectional view of the reversed state of FIG. 3 .

FIG. 7 is a B-B cross-sectional view of the inverted state of FIG. 3 .

FIG. 8 is a perspective structural view of the main body of the pneumatic screwdriver.

Fig. 9 is a front cross-sectional view of the main body of the pneumatic screwdriver.

FIG. 10 is a side sectional view of the main body of the pneumatic screwdriver 1 .

Fig. 11 is a perspective cross-sectional view of the main body of the pneumatic screwdriver.

Fig. 12 is a perspective structural view of a forward and reverse rotation sleeve.

Fig. 13 is a cross-sectional view of a forward and reverse rotation sleeve.

Fig. 14 is a perspective structural view of a forward and reverse shaft.

15 is a front cross-sectional view of the forward/reverse switch.

Fig. 16 is a perspective structural view of a cylinder.

Fig. 17 is a perspective structural view of a cylinder.

18 is a perspective structural view of a heat dissipation nut.

Fig. 19 is a connection structure diagram of the rotor and the cylinder.

Referring to Figures 1-19, this pneumatic screwdriver is about a pneumatic screwdriver, including a main body 1, the surface of the main body 1 is distributed with grooves, which play the role of holding and anti-slip, and the main body 1 includes a pneumatic control part 11 and a transmission part 12. The transmission part 12 is provided with an opening installation cavity 121, the inner wall of the motor installation cavity 121 is provided with four hook grooves 1211, and the inside of the air control part 11 is provided with a forward rotation air passage 111 and The reverse air passage 112 and the two outlet air passages 1146, the forward rotation air passage 111 and the reverse air passage 112 are respectively communicated with the transmission part 12, and the outlet air passage 1146 communicates between the installation cavity 121 and the body 1. At the rear end, the air control part 11 is also longitudinally provided with a first cavity 113 and a second cavity 114. The first cavity 113 communicates with the threaded hole 13 at the rear end of the main body 1 through an oblique through hole 131. The second cavity 113 The cavity 114 is provided with an axial hole 1144, an air intake hole 1141, a forward rotation ventilation hole 1142, a reverse rotation ventilation hole 1143 and an air outlet hole 1145. The second cavity 114 communicates with the installation cavity 121 through the axial hole 1144, and passes through the air inlet hole 1141. It communicates with the first cavity 113, communicates with the forward rotation air passage 111 through the forward rotation vent hole 1142, communicates with the reverse rotation air passage 112 through the reverse rotation ventilation hole 1143, and is connected with the outlet air passage 1146 through the air outlet hole 1145. The main body 1 is connected to the air intake assembly 2 through the threaded hole 13 at the rear end. The air intake switch assembly 3 is installed in the first cavity 113, the forward and reverse rotation control assembly 4 is installed in the second cavity 114, and the installation cavity 121 A pneumatic motor transmission assembly 5 is provided, and the front end of the transmission part 12 is connected with an impact mechanism 6, and the impact mechanism 6 is connected to the pneumatic motor. The transmission assembly 5 is connected to the transmission, and the pneumatic motor transmission assembly 5 drives the impact mechanism 6 to work.

(1) Most preferably, the air intake assembly 2 includes an air intake head 21, an air intake nozzle and a sound-absorbing cover 22, the sound-absorbing cover 22 is abutted against the rear end of the main body 1, and the air intake head 21 passes through the sound-absorbing cover 22. The cover 22 is connected to the threaded hole 13 at the rear end of the main body 1 , the air inlet nozzle is provided on the air inlet head 21 , and the air inlet head 21 and the air inlet nozzle are respectively provided with corresponding air inlet passages.

(2) Preferably, the rear end of the main body 1 is also connected with a hook 7 for easy hanging.

(3) Preferably, the air intake switch assembly 3 includes a first air plug 31, a valve stem 32, an air switch valve 33 and a trigger 34. The first air plug 31 is connected to the bottom of the first cavity 113, so The trigger 34 is rotatably arranged on the upper part of the main body 1 through a spring pin, the air switch valve 33 is arranged in the first cavity 113, the valve stem 32 is penetrated in the air switch valve 33, and its top end is clamped with the trigger 34 , its bottom end is connected to the first air plug 31 through a spring, and the external force acts on the trigger 34, so that the trigger 34 rotates downward, which will drive the valve stem 32 to move down, so that the air switch valve 33 starts to work.

(4) Preferably, the forward and reverse rotation control assembly 4 includes a second air plug 41, a forward and reverse rotation shaft 42, a forward and reverse rotation shaft sleeve 43 and a forward and reverse rotation switch 44, and the forward and reverse rotation switch 44 is slidably arranged on the trigger 34, the bottom surface of the forward/reverse switch 44 is provided with a first positioning hole 441 and a second positioning hole 442. The depth of the first positioning hole 441 is greater than that of the second positioning hole 442. The second positioning holes 442 are distributed in a straight line, the second air plug 41 is arranged at the bottom of the second cavity 114 , the forward and reverse rotation sleeve 43 is arranged in the second cavity 114 , and the forward and reverse rotation sleeve 43 is provided with an inlet The air port 431, the forward rotation air port 432, the reverse rotation air port 433 and the air outlet 434, the air inlet port 431 corresponds to the air inlet hole 1141, the forward rotation air port 432 corresponds to the forward rotation air hole 1142, The reversing vent 433 corresponds to the reversing vent hole 1143 , the air outlet 434 corresponds to the air outlet 1145 , the forward and reverse shaft 42 moves up and down in the forward and reverse shaft sleeve 43 , the forward and reverse shaft 42 A first baffle ring 421 , a second baffle ring 422 and a third baffle ring 423 are spaced on the upper part. The first baffle ring 421 , the second baffle ring 422 and the third baffle ring 423 divide the second cavity 114 into several Independent space, the bottom end of the forward and reverse shaft 42 passes through The spring is connected to the second air plug 41, the forward and reverse rotation shaft 42 is connected with a circular pin 45, and the circular pin 45 abuts on the bottom surface of the forward and reverse rotation switch 44. When the external force pushes the forward and reverse rotation switch 44, the circular The pin 45 corresponds to the first positioning hole 441, the forward and reverse rotation shaft 42 moves up, the round pin 45 is clamped in the first positioning hole 441, and the air inlet 431 and the forward rotation vent 432 are located in the second retaining ring 422 and the third In the independent space formed by the baffle ring 423, the reverse air vent 433 is isolated by the third baffle ring 423, and the gas flows in from the air inlet 431, and then flows out from the forward rotation air port 432 and the forward rotation air hole 1142 to the forward rotation outlet airflow. The air flow channel flows to the installation cavity 121 through the forward rotation outlet air channel, so that the air motor transmission assembly 5 rotates clockwise; when the external force pushes the forward and reverse rotation switch 44, the round pin 45 moves out of the first positioning hole 441, and the second positioning hole 442 Correspondingly, at this time, the forward and reverse rotation shaft 42 moves down, the spring is in a compressed state, the air inlet 431 and the reverse rotation air port 433 are in the independent space formed by the second blocking ring 422 and the third blocking ring 423, and the forward rotation ventilation port 432 Isolated by the second baffle ring 422, the gas can only flow out from the reversing air vent 433 and the reversing air hole 1143 to the reversing air passage 112, and then flows to the installation cavity 121 through the reversing air passage 112, so that the air motor drives the air motor. The assembly 5 rotates counterclockwise. When the operation is completed, the gas in the second cavity 114 is discharged from the gas outlet 434 and the gas outlet hole 1145 to the outlet flow channel 1146 , and then is discharged to the outside through the outlet flow channel 1146 .

(5) Preferably, the air motor transmission assembly 5 includes a rear cover 51, a cylinder 52, a rotor 53, a blade 54, a front cover 55 and a heat dissipation nut 56, and the rear cover 51, the cylinder 52 and the front cover 55 pass through The spring pins are connected in sequence and arranged in the installation cavity 121. The rear cover 51 is provided with a first ventilation hole 511 and a second ventilation hole 512. The first ventilation hole 511 corresponds to the forward rotation air passage 111. The second air hole 512 corresponds to the reverse air passage 112 , an installation hole 521 is axially provided in the cylinder 52 , a plurality of air outlet holes 526 are formed in the side wall of the air cylinder 52 , and the side wall of the air cylinder 52 is axially provided. A first guide air passage 522 and a second guide air passage 523 are provided. Both ends of the cylinder 52 are provided with a first air guide groove 524 and a second air guide groove 525. The first guide air passage 522 runs through the cylinder. On the first air guide grooves 524 at both ends of the cylinder 52, the second guide air passages 523 run through the second air guide grooves 525 at both ends of the cylinder 52. The first guide air passages 522 correspond to the first ventilation holes 511, and the The second guide air passage 523 corresponds to the second ventilation hole 512, the rotor 53 is rotatably arranged in the mounting hole 521, a plurality of blades 54 are embedded on the rotor 53, and some of the blades 54 are embedded in different depths. In order to make the rotor 53 eccentrically abut on the inner wall of the installation hole 521 between the first air guide groove 524 and the second air guide groove 525, it plays an insulating role. An air guide groove 524, because the rotor 53 is in contact with the inner wall of the cylinder 52, the airflow can only flow in one direction, which drives the rotor 53 to rotate clockwise. Located on the front of the front cover 55 , the inner side of the heat dissipation nut 56 is provided with a circle of slots and a plurality of guide grooves 561 are distributed. The opening 562 and the slot 563 communicate with each other. The slot 563 corresponds to the four hook slots 1211 on the front side of the inner wall of the installation cavity 121. The flow is guided to the hexagonal opening 562 to flow out, taking away the heat generated by the operation of the impact mechanism 6 , and then backflow through the heat dissipation nut 56 and the hook groove 1211 , and finally discharged from the air outlet 1146 to the outside world.

(6) Preferably, the impact mechanism 6 includes a cam 61 , an impact block 62 , an impact block bearing seat 63 , an impact rod 64 , a collar 65 , a shaft sleeve 66 and a casing 67 , and the casing 67 is connected to the body 1 . At the front end, the impact block holder 63 is arranged in the housing 67, the two impact blocks 62 are respectively fixed on the impact block holder 63 by means of a bolt, and the cam 61 is arranged at the rear end of the impact block holder 63 and is connected to the rotor. The front end shaft of 53 is connected, the cam 61 is in contact with the heat dissipation nut 56 through the cam 61 washer, the cam 61 is clamped with the impact block 62, and the impact rod 64 is inserted into the impact block holder 63 and is connected to the impact block 63. The front end of the rotor 53 is connected to the rotating shaft, the collar 65 is penetrated on the impact rod 64, the bushing 66 is in contact with the collar 65 through a gasket, and the front end of the impact rod 64 passes through the casing 67 and can be installed Screwdriver head, the rotation of the rotor 53 can drive the cam 61 and the impact rod 64 to rotate, the cam 61 drives the impact block 62 to rotate, and the impact block 62 drives the impact block holder 63 to rotate.

Working principle: press the trigger 34, use the valve stem 32 to start the air switch valve 33, and suck the gas and air into the second cavity 114 through the air intake assembly 2, and push the forward and reverse switch 44 at this time, so that the round pin 45 is locked Set in the first positioning hole 441, the forward and reverse rotation shaft 42 moves upward to isolate the reverse rotation air port 433 and the air inlet 431. The air flow can only flow out from the forward rotation air port 432, and flows to the first guide through the forward rotation air passage 111. In the air groove 524, since the rotor 53 is in contact with the inner wall of the cylinder 52, the airflow cannot flow downward, but can only flow upward clockwise, which drives the rotor 53 to rotate clockwise, and the rotor 53 drives the impact rod 64 to rotate clockwise; Turned away Close 44, so that the round pin 45 is clamped in the second positioning hole 442, the forward and reverse shaft 42 isolates the forward rotation vent 432 and the air inlet 431, and the airflow can only flow out from the reverse ventilation port 433, through the reverse ventilation flow The channel 112 flows into the second air guide groove 525. Since the rotor 53 is in contact with the inner wall of the cylinder 52, the airflow cannot flow upward, but can only flow downward counterclockwise, which drives the rotor 53 to rotate counterclockwise, and the rotor 53 drives the impact rod 64 to counterclockwise. Clockwise rotation, the gas flows out from the air outlet 526 of the cylinder 52, flows to the heat dissipation nut 56 through the hook groove 1211 of the installation cavity 121, and guides the gas to the hexagonal opening 562 through the slot 563 and the guide groove 561. The impact mechanism 6 dissipates heat, takes away the heat generated by the operation of the impact mechanism 6 , and then flows back through the cooling nut 56 and the hook groove 1211 , and finally is discharged to the outside world through the outlet air passage 1146 .

The above embodiment is only a description of the best implementation of the pneumatic screwdriver, and does not limit the scope of the pneumatic screwdriver. On the premise of not departing from the design spirit of the pneumatic screwdriver, ordinary engineers and technicians in the field make technical solutions for the pneumatic screwdriver. Various deformations and improvements of the pneumatic screwdriver shall fall within the protection scope determined by the claims of this pneumatic screwdriver.

1: Ontology

2: Intake components

3: Intake switch assembly

4: Forward and reverse control components

5: Air motor drive components

6: Impact mechanism

7: Hook

Claims (7)

A pneumatic screwdriver includes a body, the body is provided with an air intake assembly, an air intake switch assembly, a forward and reverse rotation control assembly, a pneumatic motor transmission assembly and an impact mechanism in sequence from the back to the front. The control assemblies are respectively longitudinally penetrated in the body and communicated with each other, the impact mechanism is drivingly connected with the air motor transmission assembly, the air intake switch assembly is communicated with the air intake assembly, and the forward and reverse rotation control assembly controls the difference between the gas and the body. The outflow of the flow channel causes the air motor transmission assembly to rotate forward or reverse. It is characterized in that: the intake switch assembly includes a trigger that rotates outside the body, the forward and reverse control assembly includes a forward and reverse switch, and the forward and reverse The rotary switch activity is set on the trigger. The pneumatic screwdriver according to claim 1, wherein the main body is provided with a threaded hole, a first cavity, a second cavity and an installation cavity in sequence from the back to the front, and the inner wall of the installation cavity is provided with several a hook groove, the second cavity is communicated with the installation cavity through the forward rotation passage and the reverse passage, the air intake assembly is connected in the threaded hole, and the air intake switch assembly is penetrated in the first cavity , the forward and reverse rotation control assembly is passed through the second cavity, and the pneumatic motor transmission assembly is passed through the installation cavity. The pneumatic screwdriver according to claim 1, wherein the forward and reverse rotation control assembly further comprises a second wind plug, a forward and reverse rotation shaft and a forward and reverse rotation shaft sleeve, and the second wind plug is penetrated in the second cavity. At the bottom, the side wall of the forward and reverse shaft sleeve is provided with an air inlet, a forward rotation air port and a reverse rotation air port, the air inlet corresponds to the air inlet hole that communicates with the second cavity and the first cavity, and the positive and negative The reverse air port corresponds to the forward rotation air passage, the reverse air port corresponds to the reverse rotation air passage, and the forward and reverse shaft is penetrated in the forward and reverse shaft sleeve and is elastically connected to the second air plug through an elastic member Abutting, the top of the forward-reverse shaft is connected with a round pin, the round pin is in contact with the bottom surface of the forward-reverse switch, and the forward-reverse switch drives the forward-reverse shaft to move up and down through the round pin to isolate the forward-rotation air port and the reverse-rotation ventilation Orifice, so that the airflow can only flow out from the forward flow passage or the reverse flow passage. The pneumatic screwdriver according to claim 1, wherein the air intake assembly includes an air intake head, an air intake nozzle and a sound-absorbing cover, and the sound-absorbing cover is abutted against the rear end of the main body, The air intake head is connected to the rear end of the body through the muffler cover, the air intake nozzle is arranged on the air intake head, and the air intake head and the air intake nozzle are respectively provided with corresponding air intake passages. The pneumatic screwdriver according to claim 1, wherein the air intake switch assembly further comprises a first air plug, a valve stem and an air switch valve, the first air plug is connected to the bottom of the first cavity, and the The trigger is rotatably arranged on the outer wall of the body through a spring pin, the air switch valve is arranged in the first cavity, the valve rod is penetrated in the air switch valve, the top end is clamped with the trigger, and the bottom end is connected to the trigger through a spring. First wind plug on. The pneumatic screwdriver according to claim 1, wherein the pneumatic motor transmission assembly includes a rear cover, a cylinder, a rotor, a blade, a front cover and a heat dissipation nut, and the front cover and the rear cover are respectively connected to each other through spring pins. The front and rear ends of the cylinder, the side walls of the cylinder are provided with a number of air outlet holes, the cylinder is axially provided with a mounting hole, a first guide air passage and a second guide air passage, and both ends of the cylinder are provided with a second air guide. An air guide groove and a second air guide groove, the first guide air channel runs through the first air guide grooves at both ends of the cylinder, the second guide air channel runs through the second air guide grooves at both ends of the cylinder, and the rear cover is provided with There are a first air hole and a second air hole, the first air guide groove, the first air hole and the forward rotation air passage correspond to the three, and the second air guide groove and the second air hole correspond to the reverse air passage. The three air channels correspond to each other, the rotor is eccentrically penetrated in the installation hole, and its side wall abuts against the inner wall of the installation hole between the first air guide groove and the second air guide groove to make the air flow in one direction. There are several blades with different installation depths distributed on the rotor, the heat dissipation nut is arranged in front of the front cover, the inner side of the heat dissipation nut is provided with a circle of slots and a number of guide grooves are distributed. The guide groove is communicated with the hexagonal opening and the slot provided in the middle of the heat dissipation nut, and the front end of the rotor passes through the front cover and the heat dissipation nut and is connected with the impact mechanism in a driving manner. The pneumatic screwdriver according to claim 1, characterized in that: the impact mechanism comprises a cam, an impact block, an impact block bearing seat, an impact rod, a collar, a shaft sleeve and a casing, and the casing is connected to the front end of the main body, so The impact block bearing seat is arranged in the outer casing, and the two impact blocks are respectively fixed on the impact block bearing seat by means of a bolt. It is clamped with the impact block, the impact rod is penetrated in the impact block bearing seat and is connected with the air motor transmission assembly, and the collar is connected to the impact block. On the impact rod, the shaft sleeve is in contact with the collar through the gasket, and the front end of the impact rod passes through the casing and is connected with a detachable pneumatic screwdriver.

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