CN219666443U - Pneumatic wrench - Google Patents

Abstract

The utility model discloses a pneumatic wrench, which comprises a handle with an air inlet channel, an inner cylinder body, an outer cylinder body, a blade shaft, an air inlet valve core, a plurality of blades, a plurality of air inlet valves and a plurality of air outlet valves, wherein the inner cylinder body and the outer cylinder body are arranged in a nested manner; the air inlet valve core is provided with an air inlet and an air outlet which are mutually independent, and a first air chamber and a second air chamber which are mutually independent are formed between the outer cylinder body and the inner cylinder body; both the first air chamber and the second air chamber are communicated with the accommodating cavity; one of the first air chamber and the second air chamber is communicated with the air inlet passage through the air inlet and the other is communicated with the air outlet. Compressed gas introduced along the air inlet channel flows to the accommodating cavity through one of the first air chamber and the second air chamber and then flows to the air outlet through the other air chamber. According to the utility model, a through gas flow passage is formed among the handle, the outer cylinder body and the inner cylinder body, so that the blocking force is small in the flow process of compressed gas, the pressure loss is small, and the work efficiency of the gas is improved.

Description

Pneumatic wrench

Technical Field

The utility model relates to the technical field of wrenches, in particular to a pneumatic wrench.

Background

The pneumatic wrench is mainly used for completing the locking or disassembling work of nuts and bolts by converting compressed gas into rotary energy, has the advantages of small volume, light weight, large output torque and the like, and is widely applied to the fields of automobile repair, heavy equipment repair, product assembly and the like.

As shown in fig. 1, the conventional pneumatic wrench comprises a primary handle, a primary inner cylinder body and a primary blade shaft, wherein the primary inner cylinder body is fixedly arranged at one end of the primary handle, the primary blade shaft is rotatably arranged in the primary inner cylinder body through a primary bearing, the primary handle is provided with an air inlet flow passage and an air collecting chamber, a throttling assembly is arranged in the air inlet flow passage, compressed air in the air inlet flow passage flows into the air collecting chamber after passing through the throttling assembly, flows out of the air collecting chamber, passes through the primary bearing arranged at the end part of the primary blade shaft, indirectly flows into the primary inner cylinder body from the end part of the primary inner cylinder body, and drives a primary impeller on the primary blade shaft to rotate, thereby realizing output torque.

Because the structure of the existing pneumatic wrench is complex, the blocking force is large in the flowing process of compressed gas, the pressure loss is overlarge, the pressure drop is obvious, and the working efficiency of the gas is low.

Disclosure of Invention

Therefore, the utility model aims to provide the pneumatic wrench, wherein a gas flow passage which is communicated from outside to inside is formed among the handle, the outer cylinder body and the inner cylinder body, the blocking force is small in the flowing process of compressed gas, the pressure loss is small, and the pneumatic wrench is beneficial to improving the working efficiency of the gas.

The pneumatic wrench provided by the utility model comprises the following components:

a handle having an air intake passage;

an inner cylinder body and an outer cylinder body which are nested inside and outside;

a blade shaft which is rotatably arranged in the accommodating cavity of the inner cylinder body and provided with a plurality of blades;

an air inlet valve core embedded on the cylinder wall of the outer cylinder body;

the air inlet valve core is provided with an air inlet and an air outlet which are mutually independent, and a first air chamber and a second air chamber which are mutually independent are formed between the outer cylinder body and the inner cylinder body; both the first air chamber and the second air chamber are communicated with the accommodating cavity; one of the first air chamber and the second air chamber is communicated with the air inlet channel through the air inlet, and the other is communicated with the air outlet; compressed gas introduced along the air inlet channel flows to the accommodating cavity through one of the first air chamber and the second air chamber and then flows to the air outlet through the other air chamber.

Preferably, the cylinder wall of the outer cylinder body is provided with a first air inlet hole and a first air outlet hole which are diagonally distributed, and a second air inlet hole and a second air outlet hole which are diagonally distributed;

when the air inlet is communicated with the first air chamber and the air outlet is communicated with the second air chamber, compressed air flowing out of the air inlet flows into the first air chamber through the first air inlet hole, flows out of the second air chamber and flows into the air outlet through the first air outlet hole;

when the air inlet is communicated with the second air chamber and the air outlet is communicated with the first air chamber, compressed air flowing out of the air inlet flows into the second air chamber through the second air inlet hole, flows out of the first air chamber and flows into the air outlet through the second air outlet hole.

Preferably, the outer side surface of the inner cylinder body is provided with a first air collecting groove and a second air collecting groove which are independent of each other, at least one end of the inner cylinder body is provided with a first end surface groove and a second end surface groove which are independent of each other and communicated with the accommodating cavity, the end part of the inner cylinder body is provided with a first communication hole and a second communication hole, the first air collecting groove is communicated with the first end surface groove through the first communication hole, and the second air collecting groove is communicated with the second end surface groove through the second communication hole.

Preferably, the method further comprises:

the first end cover and the second end cover are respectively arranged at two ends of the inner cylinder body and used for blocking the accommodating cavity;

the first connecting pin is connected between the outer cylinder body and the inner cylinder body and axially penetrates through the first end cover;

and the second connecting pin is connected between the handle and the inner cylinder body and axially penetrates through the second end cover.

Preferably, the outer side surface of the inner cylinder body is integrally provided with side separating ribs for separating the first air collecting groove and the second air collecting groove, and the first connecting pin and the second connecting pin are respectively inserted into two ends of the side separating ribs.

Preferably, the blade shaft further comprises a first bearing and a second bearing which are respectively arranged at two ends of the blade shaft; the end part of the first end cover is integrally and fixedly provided with a limit flange, the first bearing is arranged in the limit flange, and two ends of the first bearing respectively prop against limit check rings sleeved on the first end cover and the blade shaft; the end part of the second end cover is integrally provided with a limiting bulge propped against the inner ring of the second bearing, and the handle is fixedly provided with a propping bulge propped against the outer ring of the second bearing.

Preferably, the device further comprises a main shaft coaxially connected with the blade shaft, the blade shaft is provided with an oil filling hole, the main shaft is provided with an oil storage tank coaxially penetrating through the oil filling hole, and an oil filling nozzle is fixedly arranged at one end, far away from the oil storage tank, of the oil filling hole.

Preferably, the handle is provided with a structural hole, and the structural hole is detachably and fixedly provided with a plug.

Preferably, the air inlet adjusting assembly is arranged between the longitudinal air inlet cavity of the air inlet channel and the handle, and comprises:

an air inlet joint fixedly arranged at one end of the longitudinal air inlet cavity;

the switch pin can be slidably inserted between the longitudinal air inlet cavity and the handle;

the limit switch can be rotatably arranged on the handle and props against the switch pin;

the sealing gasket is fixedly arranged at one end of the switch pin, which is far away from the limit switch;

and the elastic piece is arranged between the sealing gasket and the air inlet joint.

Preferably, one end of the air inlet valve core, which is close to the air outlet, is provided with a spanner for adjusting the air inlet direction of the air inlet valve core, and the spanner is matched with the opposite ends of the air inlet valve core in a concave-convex mode.

Compared with the background art, the utility model changes the structures of the inner cylinder body and the outer cylinder body, and a first air chamber and a second air chamber which are mutually independent are formed between the outer cylinder body and the inner cylinder body. In addition, the utility model additionally provides an air inlet valve core in the outer cylinder, the air inlet valve core is embedded and fixed on the cylinder wall of the outer cylinder, the air inlet valve core is provided with an air inlet and an air outlet which are mutually independent, and the first air chamber and the second air chamber are both communicated with the accommodating cavity. One of the first air chamber and the second air chamber is communicated with the air inlet passage through the air inlet and the other is communicated with the air outlet.

When compressed gas is introduced into the air inlet channel, the compressed gas flows into one of the first air chamber and the second air chamber through the air inlet and then flows into the accommodating cavity, and the compressed gas drives the blades to rotate around the blade shaft, so that torque output is realized. Compressed gas in the accommodating cavity flows to the exhaust port through the other one under the extrusion of the blade, and is discharged from the exhaust port.

According to the utility model, the gas flow passage which is communicated from outside to inside is formed among the handle, the outer cylinder body and the inner cylinder body, so that the blocking force is small in the process of compressing gas flow, the pressure loss is small, and the work doing efficiency of the gas is improved.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present utility model, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.

FIG. 1 is a partial cross-sectional view of a prior art pneumatic wrench;

FIG. 2 is a front view of an air wrench according to an embodiment of the present utility model;

FIG. 3 is a side view of FIG. 2;

FIG. 4 is an exploded view of FIG. 1;

FIG. 5 is a longitudinal cross-sectional view of FIG. 1;

FIG. 6 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 7 is an axial cross-sectional view of FIG. 1;

FIG. 8 is a block diagram of the inner cylinder of FIG. 1;

FIG. 9 is a block diagram of the outer cylinder of FIG. 1;

FIG. 10 is a block diagram of the intake valve spool of FIG. 1;

FIG. 11 is an axial cross-sectional view of FIG. 10;

fig. 12 is an exploded view of the striking assembly of fig. 1.

The reference numerals are as follows:

the device comprises a primary handle 01, a primary inner cylinder 02, a primary leaf shaft 03, a primary bearing 04 and a throttle assembly 05;

an intake runner 011 and an air collecting chamber 012;

the handle 11, the inner cylinder 12, the outer cylinder 13, the vane shaft 14, the air inlet valve core 15, the first air chamber 16, the second air chamber 17, the first end cover 18, the second end cover 19, the first connecting pin 20, the second connecting pin 21, the first bearing 22, the second bearing 23, the limit retainer ring 24, the striking assembly 25, the oil filler neck 26, the plug 27, the air inlet adjusting assembly 28, the wrench 29, the muffler 30 and the front shell 31;

an intake passage 111 and an abutment boss 112;

a first gas collecting channel 121, a first end surface channel 122, a second end surface channel 123, a first communication hole 124, a second communication hole 125, side separation ribs 126, and an end surface separation block 127;

a first air inlet hole 131, a first air outlet hole 132, a second air inlet hole 133, a second air outlet hole 134, and an axial slot 135;

the vane 141 and the oil injection hole 142;

an intake port 151 and an exhaust port 152;

a limit flange 181;

a limit protrusion 191;

a main shaft 251, a striking sleeve 252, a striking block 253, a striking frame 254, a spline housing 255 and a spacer 256;

an oil reservoir 2511;

an air inlet connector 281, a switch pin 282, a limit switch 283, a sealing gasket 284, an elastic member 285 and a guide sleeve 286.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In order that those skilled in the art will better understand the present utility model, the following description will be given in detail with reference to the accompanying drawings and specific embodiments.

The embodiment of the utility model discloses a pneumatic wrench, which comprises a handle 11, an inner cylinder body 12, an outer cylinder body 13, a blade shaft 14 and an air inlet valve core 15 as shown in figures 1 to 11. The handle 11 and the striking assembly 25 are respectively fixed at both ends of the outer cylinder 13. The handle 11 has an intake passage 111 for introducing compressed gas. Specifically, the air intake passage 111 is formed by penetrating a longitudinal air intake chamber, an inclined air intake chamber, and a lateral air intake chamber in this order.

Both the inner cylinder body 12 and the outer cylinder body 13 are nested inside and outside. Specifically, the inner cylinder 12 is fixed in the outer cylinder 13. The air release hole arranged at the top end of the inner cylinder body 12 is communicated with the air release hole arranged at the top end of the outer cylinder body 13, so that compressed air can be discharged along the air release hole, and the internal pressure of the inner cylinder body 12 is ensured to be stable.

The vane shaft 14 is rotatably arranged on the inner cylinder body 12, and a plurality of vanes 141 are arranged on the outer side surface of the vane shaft 14, so that compressed gas in the inner cylinder body 12 drives the vane shaft 14 to rotate through the vanes 141. The blade shaft 14 is in spline connection with the main shaft 251 of the striking assembly 25, so that the blade shaft 14 can drive the main shaft 251 to synchronously rotate. Specifically, the center of the inner cylinder 12 is provided with a receiving chamber in which the vane shaft 14 provided with the vane 141 is rotatably installed.

The air inlet valve core 15 is embedded and fixed on the cylinder wall of the outer cylinder body 13, the center line of the air inlet valve core 15 is parallel to the center line of the outer cylinder body 13, and the length of the air inlet valve core 15 is smaller than that of the outer cylinder body 13. Specifically, the bottom of the cylinder wall of the outer cylinder 13 is provided with an axial groove 135, and the intake valve core 15 is fixedly arranged in the axial groove 135.

The intake valve spool 15 is provided with an intake port 151 and an exhaust port 152 independent of each other. The air inlet valve core 15 is of a cylindrical structure, and the middle section of the air inlet valve core is solid and two ends of the air inlet valve core are hollow. The two ends of the air inlet valve core 15 are respectively provided with an air inlet cavity and an air outlet cavity, the air inlet cavity and the air outlet cavity are separated by a built-in partition plate, the built-in partition plate can be integrally and fixedly arranged in the air inlet valve core 15, and the air inlet cavity and the air outlet cavity can be obtained through a drilling process. The intake port 151 is provided on the side of the intake chamber, and the exhaust port 152 is provided on the side of the exhaust chamber, but the intake port 151 and the exhaust port 152 may be provided on both sides of the intake valve core 15, respectively.

A first air chamber 16 and a second air chamber 17 which are independent of each other are formed between the outer cylinder 13 and the inner cylinder 12, and both the first air chamber 16 and the second air chamber 17 are communicated with the accommodating chamber. The first and second air cells 16 and 17 are alternately connected to the air inlet 151 and the air outlet 152, one for collecting the compressed air flowing in from the air inlet 151 and supplying the inner cylinder 12, and the other for collecting the compressed air discharged from the inner cylinder 12. The structure of both the first air cell 16 and the second air cell 17 can be specifically referred to as follows.

One of the first air chamber 16 and the second air chamber 17 communicates with the intake passage 111 through the intake port 151, and the other communicates with the exhaust port 152.

When the air inlet 151 is communicated with the first air chamber 16, the air outlet 152 is communicated with the second air chamber 17, compressed air is introduced along the air inlet channel 111, the compressed air flows into the first air chamber 16 through the air inlet 151 of the air inlet valve core 15, then flows into the accommodating cavity of the inner cylinder body 12 from the first air chamber 16, and the compressed air drives the vane 141 to rotate around the vane shaft 14 in the positive direction, so that torque output is realized. Then, the compressed gas in the receiving chamber flows from the second air chamber 17 to the exhaust port 152 under the compression of the vane 141, and is discharged from the exhaust port 152.

When the exhaust port 152 is communicated with the first air chamber 16, the air inlet 151 is communicated with the second air chamber 17, compressed air is introduced along the air inlet channel 111, the compressed air flows into the second air chamber 17 through the air inlet 151 of the air inlet valve core 15, then flows into the accommodating cavity of the inner cylinder body 12 from the second air chamber 17, and the compressed air drives the vane 141 to reversely rotate around the vane shaft 14, so that torque output is realized. Then, the compressed gas in the accommodating chamber flows from the first air chamber 16 to the exhaust port 152 under the compression of the vane 141, and out of the exhaust port 152.

In summary, the present utility model changes the structures of the inner cylinder 12 and the outer cylinder 13, and adds the air inlet valve core 15 in the outer cylinder 13, so that the handle 11, the outer cylinder 13 and the inner cylinder 12 form an air flow passage penetrating from outside to inside, the blocking force is smaller in the process of compressing air, the pressure loss is smaller, and the work efficiency of air is improved.

The cylinder wall of the outer cylinder 13 is provided with a first air inlet hole 131 and a first air outlet hole 132 which are diagonally distributed, and a second air inlet hole 133 and a second air outlet hole 134 which are diagonally distributed. Specifically, the center of the outer cylinder 13 is provided with a stepped hole, and the first air inlet hole 131, the first air outlet hole 132, the second air inlet hole 133 and the second air outlet hole 134 are all circular through holes which are communicated with the stepped hole and the axial groove 135.

When the gas inlet 151 communicates with the first gas chamber 16 and the gas outlet 152 communicates with the second gas chamber 17, the compressed gas flowing out of the gas inlet 151 flows into the first gas chamber 16 through the first gas inlet hole 131, flows out of the second gas chamber 17, and flows into the gas outlet 152 through the first gas outlet hole 132;

when the gas inlet 151 communicates with the second gas chamber 17 and the gas outlet 152 communicates with the first gas chamber 16, the compressed gas flowing out of the gas inlet 151 flows into the second gas chamber 17 through the second gas inlet hole 133, flows out of the first gas chamber 16, and flows into the gas outlet 152 through the second gas outlet hole 134.

The outer side surface of the inner cylinder body 12 is provided with a first air collecting groove 121 and a second air collecting groove which are mutually independent, wherein the outer side surface of the inner cylinder body 12 is clung to the stepped hole of the outer cylinder body 13, a first air chamber 16 is formed between the first air collecting groove 121 and the inner side wall of the outer cylinder body 13, and a second air chamber 17 is formed between the second air collecting groove and the inner side wall of the outer cylinder body 13. The outer side surface of the inner cylinder body 12 is integrally provided with a side separating rib 126 for separating the first air collecting groove 121 from the second air collecting groove, so that the first air chamber 16 and the second air chamber 17 are mutually independent, and air leakage is avoided. Specifically, the axial cross-sections of both the first gas collecting channel 121 and the second gas collecting channel are semi-crescent shaped.

At least one end of the inner cylinder body 12 is provided with a first end surface groove 122 and a second end surface groove 123 which are independent of each other, and both the first end surface groove 122 and the second end surface groove 123 are communicated with the accommodating chamber. Specifically, the two ends of the inner cylinder body 12 are respectively provided with a first end face groove 122 and a second end face groove 123, and an end face separation block 127 is arranged between the first end face groove 122 and the second end face groove 123 of each end, so that the first end face groove 122 and the second end face groove 123 of each end are ensured to be kept independent of each other, and air leakage is avoided.

The end of the inner cylinder body 12 is provided with a first communication hole 124 and a second communication hole 125, the first air collecting tank 121 and the first end surface tank 122 are communicated through the first communication hole 124, and the second air collecting tank and the second end surface tank 123 are communicated through the second communication hole 125, so that both the first air chamber 16 and the second air chamber 17 are communicated with the accommodating cavity of the inner cylinder body 12. The first communication hole 124 and the second communication hole 125 at each end are also separated by an end-face separation block 127. It should be noted that the wall thickness of the inner cylinder 12 becomes larger gradually from the air release hole to the side separation rib 126 along the circumferential direction of the inner cylinder 12, and the wall thickness at the side separation rib 126 becomes maximum. Wherein the side separating rib 126 is opposite to both the intake valve core 15 in the radial direction of the vane shaft 14.

The pneumatic wrench further comprises a first end cover 18 and a second end cover 19 respectively arranged at two ends of the inner cylinder body 12, and the first end cover and the second end cover are used for sealing the accommodating cavity of the inner cylinder body 12. The pneumatic wrench further comprises a first connecting pin 20 and a second connecting pin 21, wherein the first connecting pin 20 is connected between the outer cylinder 13 and the inner cylinder 12 and penetrates through the first end cover 18 along the axial direction of the vane shaft 14, the second connecting pin 21 is connected between the handle 11 and the inner cylinder 12 and penetrates through the second end cover 19 along the axial direction of the vane shaft 14, so that the accommodating cavity has good sealing performance, and the handle 11, the inner cylinder 12 and the outer cylinder 13 can be reliably connected.

The first connecting pin 20 and the second connecting pin 21 are respectively inserted into two ends of the side separating rib 126, so that the pneumatic wrench is more compact in structure.

The pneumatic wrench further includes a first bearing 22 and a second bearing 23 mounted to both ends of the shaft 14, respectively, for supporting the shaft 14 for rotation. A limit flange 181 is integrally fixed at the end of the first end cover 18, and a first bearing 22 is installed in the limit flange 181. The blade shaft 14 is also sleeved with a limiting retainer ring 24, the limiting retainer ring 24 is fixed between the striking assembly 25 and the outer cylinder 13, and two ends of the first bearing 22 respectively abut against the first end cover 18 and the limiting retainer ring 24 sleeved by the blade shaft 14, so that the first bearing 22 is limited axially. The end of the second end cover 19 is integrally provided with a limiting protrusion 191, the handle 11 is fixedly provided with an abutting protrusion 112, the limiting protrusion 191 and the abutting protrusion 112 are respectively positioned on two sides of the second bearing 23, the limiting protrusion 191 abuts against the inner ring of the second bearing 23, the abutting protrusion 112 abuts against the outer ring of the second bearing 23, and the second bearing 23 is axially limited.

The center of the blade shaft 14 is provided with an oil filling hole 142, the pneumatic wrench further comprises a main shaft 251 coaxially connected with the blade shaft 14, the main shaft 251 is provided with an oil storage tank 2511, the oil storage tank 2511 and the oil filling hole 142 coaxially penetrate, lubricating oil is supplied to the oil storage tank 2511 through the oil filling hole 142, the main shaft 251 is further provided with a plurality of radial oil holes communicated with the oil storage tank 2511, and the oil storage tank 2511 supplies lubricating oil to the striking assembly 25 through the radial oil holes. The oil filler neck 26 is fixedly arranged at one end of the oil filler hole 142 away from the oil storage tank 2511, so that lubricating oil can be conveniently injected. The nozzle 26 is coaxially penetrated through the oil filling hole 142 in the axial direction and is screw-coupled to the handle 11.

In addition to the main shaft 251, as shown in fig. 12, the striking assembly 25 further includes a striking sleeve 252, a striking block 253, a striking frame 254, and a spline sleeve 255, wherein the striking sleeve 252 is sleeved on the main shaft 251, the striking block 253 includes a cylindrical pin and arc blocks symmetrically disposed on two sides of the cylindrical pin, the cylindrical pin is matched with an arc groove disposed on a side surface of the striking sleeve 252, the arc blocks are matched with an arc groove disposed on a side surface of the spline sleeve 255, the spline sleeve 255 is fixedly disposed on the striking frame 254, a gasket 256 is disposed at an end portion of the striking frame 254, and the spline sleeve 255 is in key connection with the leaf shaft 14. The pneumatic wrench further comprises a front shell 31 covering the periphery of the striking assembly 25, and the front shell 31 is fixedly connected with the outer cylinder 13.

The handle 11 is provided with a structural hole which is obliquely communicated with the air inlet channel 111, so that the air inlet channel 111 is conveniently cleaned and lubricating protective oil is conveniently injected. The structure hole is detachably and fixedly provided with a plug 27 for plugging the structure hole. The structural hole is connected with the plug 27 by screw threads.

The air wrench further comprises an air intake adjusting assembly 28 arranged between the longitudinal air intake cavity of the air intake passage 111 and the handle 11 for adjusting the air intake amount of the air intake passage 111. The intake air adjusting assembly 28 includes an intake air joint 281, a switch pin 282, a limit switch 283, a gasket 284, and an elastic member 285. Wherein, an air inlet connector 281 is fixed at one end of the longitudinal air inlet cavity of the air inlet channel 111, and a switch pin 282 is slidably inserted at the other end, and an external air source supplies compressed air to the air inlet channel 111 through the air inlet connector 281. An O-shaped sealing ring is arranged between the air inlet connector 281 and the longitudinal air inlet cavity to prevent air leakage. The handle 11 is rotatably provided with a limit switch 283, the limit switch 283 is abutted against the switch pin 282, one end of the limit switch 283 far away from the switch pin 282 is provided with a sealing pad 284, and the sealing pad 284 is elastically abutted against the air inlet connector 281 through an elastic piece 285. The elastic element 285 may be a generally cylindrical spring, and two ends respectively abut against the gasket 284 and the air inlet connector 281.

When the limit switch 283 is rotated counterclockwise, the limit switch 283 pushes the switch pin 282 to move downward, the elastic member 285 is compressed, the switch pin 282 drives the gasket 284 to move downward, the gasket 284 opens the passage with the handle 11, and the air inlet connector 281 communicates with the air inlet passage 111. When the limit switch 283 is rotated clockwise, the elastic member 285 resumes elastic deformation, the elastic member 285 pushes the switch pin 282 to move upward, and the gasket 284 moves upward accordingly until the gasket 284 closes the sealing handle 11, and the air inlet connector 281 is closed out of communication with the air inlet passage 111.

In addition, the air inlet adjusting assembly 28 further comprises a guide sleeve 286 arranged between the switch pin 282 and the handle 11, the switch pin 282 is in sliding fit with the guide sleeve 286, and the guide sleeve 286 is fixedly arranged on the handle 11 and used for guiding the switch pin 282 to slide linearly.

The exhaust port 152 of the intake valve core 15 is provided with a muffler 30 for eliminating noise generated during exhaust. In addition, the end of the intake valve core 15 near the exhaust port 152 is further fixedly provided with a wrench 29, the opposite ends of the wrench 29 and the intake valve core 15 are in concave-convex fit, the opposite sides of the wrench 29 where the wrench is installed Kong Liangxiang are specifically provided with engagement grooves, the opposite sides of the end face of the intake valve core 15 are integrally provided with engagement teeth, the engagement teeth are matched with the engagement grooves, the wrench 29 is utilized to drive the intake valve core 15 to rotate synchronously, and the intake direction of the intake valve core 15 is regulated, so that the intake port 151 is alternately communicated with the first air chamber 16 and the second air chamber 17.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A pneumatic wrench, comprising:

a handle (11) having an air intake passage (111);

an inner cylinder body (12) and an outer cylinder body (13) which are nested inside and outside;

a blade shaft (14) which is rotatably arranged in the accommodating cavity of the inner cylinder body (12) and is provided with a plurality of blades (141);

an air inlet valve core (15) embedded in the cylinder wall of the outer cylinder body (13);

the air inlet valve core (15) is provided with an air inlet (151) and an air outlet (152) which are mutually independent, and a first air chamber (16) and a second air chamber (17) which are mutually independent are formed between the outer cylinder (13) and the inner cylinder (12); -both the first air chamber (16) and the second air chamber (17) are in communication with the accommodation cavity; one of the first air chamber (16) and the second air chamber (17) is communicated with the air intake passage (111) through the air intake port (151) and the other is communicated with the air exhaust port (152); compressed gas introduced along the air inlet channel (111) flows to the accommodating cavity through one of the first air chamber (16) and the second air chamber (17) and then flows to the air outlet (152) through the other air chamber.

2. Pneumatic wrench according to claim 1, wherein the cylinder wall of the outer cylinder (13) is provided with a first air inlet hole (131) and a first air outlet hole (132) diagonally distributed and a second air inlet hole (133) and a second air outlet hole (134) diagonally distributed;

when the air inlet (151) is communicated with the first air chamber (16) and the air outlet (152) is communicated with the second air chamber (17), compressed air flowing out of the air inlet (151) flows into the first air chamber (16) through the first air inlet hole (131), flows out of the second air chamber (17) and flows into the air outlet (152) through the first air outlet hole (132);

when the air inlet (151) is communicated with the second air chamber (17) and the air outlet (152) is communicated with the first air chamber (16), compressed air flowing out of the air inlet (151) flows into the second air chamber (17) through the second air inlet hole (133), flows out of the first air chamber (16) and flows into the air outlet (152) through the second air outlet hole (134).

3. The pneumatic wrench as claimed in claim 1, wherein the outer side surface of the inner cylinder body (12) is provided with a first air collecting groove (121) and a second air collecting groove which are independent of each other, at least one end of the inner cylinder body (12) is provided with a first end surface groove (122) and a second end surface groove (123) which are independent of each other and are communicated with the accommodating cavity, the end portion of the inner cylinder body (12) is provided with a first communication hole (124) and a second communication hole (125), the first air collecting groove (121) and the first end surface groove (122) are communicated through the first communication hole (124), and the second air collecting groove and the second end surface groove (123) are communicated through the second communication hole (125).

4. A pneumatic wrench as claimed in claim 3, further comprising:

the first end cover (18) and the second end cover (19) are respectively arranged at two ends of the inner cylinder body (12) and used for blocking the accommodating cavity;

a first connecting pin (20) connected between the outer cylinder (13) and the inner cylinder (12) and passing through the first end cap (18) in the axial direction;

and a second connecting pin (21) connected between the handle (11) and the inner cylinder (12) and axially penetrating through the second end cover (19).

5. Pneumatic wrench according to claim 4, wherein the outer side surface of the inner cylinder body (12) is integrally provided with side separating ribs (126) for separating the first gas collecting channel (121) and the second gas collecting channel, and the first connecting pin (20) and the second connecting pin (21) are respectively inserted into two ends of the side separating ribs (126).

6. Pneumatic wrench according to claim 4, further comprising a first bearing (22) and a second bearing (23) mounted at each end of the blade shaft (14); a limit flange (181) is integrally and fixedly arranged at the end part of the first end cover (18), the first bearing (22) is arranged in the limit flange (181) and two ends of the first bearing respectively prop against limit check rings (24) sleeved by the first end cover (18) and the leaf shaft (14); the end part of the second end cover (19) is integrally provided with a limiting protrusion (191) propped against the inner ring of the second bearing (23), and the handle (11) is fixedly provided with a propping protrusion (112) propped against the outer ring of the second bearing (23).

7. The pneumatic wrench as claimed in any one of claims 1-4, further comprising a main shaft (251) coaxially connected to the blade shaft (14), wherein the blade shaft (14) is provided with an oil filling hole (142), the main shaft (251) is provided with an oil storage tank (2511) coaxially penetrating the oil filling hole (142), and an oil filling nozzle (26) is fixedly arranged at one end of the oil filling hole (142) away from the oil storage tank (2511).

8. Pneumatic wrench according to any one of claims 1-4, wherein the handle (11) is provided with a structural hole, and wherein the structural hole is detachably fastened with a plug (27).

9. Pneumatic wrench according to any one of claims 1-4, further comprising an air intake adjustment assembly (28) provided between a longitudinal air intake cavity of the air intake channel (111) and the handle (11), the air intake adjustment assembly (28) comprising:

an air inlet connector (281) fixedly arranged at one end of the longitudinal air inlet cavity;

a switch pin (282) slidably inserted between the longitudinal air inlet chamber and the handle (11);

a limit switch (283) rotatably provided on the handle (11) and abutting against the switch pin (282);

the sealing pad (284) is fixedly arranged at one end, far away from the limit switch (283), of the switch pin (282);

and an elastic member (285) provided between the gasket (284) and the intake connector (281).

10. Pneumatic wrench according to any one of claims 1-4, wherein one end of the inlet valve core (15) close to the exhaust port (152) is provided with a wrench (29) for adjusting the inlet direction of the inlet valve core (15), the wrench (29) being in a male-female fit with the opposite ends of the inlet valve core (15).