SU1676789A1 - Pneumatic angular nut-runner - Google Patents

Abstract

This invention relates to a handheld mechanized tool. The purpose of the invention is the expansion of technological capabilities by expanding the range of sizes of tightenable threaded connections. With a replaceable nozzle 23, the pneumatic angle wrench is mounted on the threaded threaded connection and by pressing the trigger 21, the pneumatic actuator 3 is started. em accelerated VO about V4 00 Yu Figure 1

Description

connection thread. At this point, the freewheel sprocket 15 rotates freely relative to the yoke. When the resistance moment in the thread is compared with the power of the pneumatic motor 3, the latter stops. After that, the handle 2 of the angled pneumatic wrench is rotated about the axis of the threaded connection to be tightened. At this time, under the action of the reactive moment, the bevel gear 10 tends to rotate relative to the bevel gear 11. However, through the planetary gear 5, the torque limit clutch and the freewheel, the reactive torque closes onto the housing 1. When the torque limit is reached, the coupling half is 13, overcoming the force of the spring 14, begins to slip relative to the driven coupling half 12.2 Il.

This invention relates to a handheld mechanized tool and can be used in various industries for assembling threaded connections.

The purpose of the invention is the expansion of technological capabilities by expanding the range of sizes of tightenable threaded connections.

FIG. 1 shows a pneumatic angle wrench, longitudinal section; in fig. 2 shows section A-A in FIG. one.

The pneumatic angle wrench includes a housing 1 with a handle 2, placed in the housing 1 air motor 3 with an output shaft 4, a planetary gear 5, including a central gear wheel 6 with external teeth and a carrier 7, a spindle 8 with a head 9 at the end, and installed with the planet carrier 7 of the planetary gearbox 5 through bevel gears 10 and 11, the torque limit clutch including the driven coupling half 12 rigidly connected to the central gear wheel 6 with the outer teeth, and the driving coupling half 13 mounted on the output shaft 4 with the joint rotation and relative axial movement and spring-loaded to the driven coupling half 12 by the spring 14, and the freewheel, including a sprocket 15 placed on the output shaft 4 between the air motor 3 and the driving half coupling 13, fixed to the housing 1 of the yoke 16 and rollers 17 placed between them, each of which is spring-loaded in the tangential direction by a spring 18. In the handle 2, there is an air inlet duct 19, as well as a ball valve 20, a trigger 21 and a pusher 22, designed to interact with the ball valve the valve 20 and the trigger 21. On the head 9 of the key, a replaceable nozzle 23 is installed. In the asterisk 15 there are wedge slots 24

An adjusting nut 25 is installed on the output shaft 4.

Pneumatic angle wrench works as follows.

Replaceable nozzle 23 pneumatic

the angle wrench is mounted on the nut or bolt head of the tightening threaded joint (not shown) and the trigger 21 is pressed, which opens the ball valve 20 through the pusher 22 and the compressed air opens through the air passage 19 to the pneumatic motor 3. Rotation from the output shaft 4 of the air motor 3 through the clutch of the moment limit, planetary

the gearbox 5 and the bevel gears 10 and 11 are transmitted to the spindle 8 with the turnkey head 9, which, through the interchangeable nozzle 23, accelerates screwing the nut or screwing in the bolt. At this moment

the sprocket 15 of the one-way clutch freely rotates with respect to the cage 16. The high-speed screwing of the nut or screwing in the screw continues until the moment on the spindle becomes

equal to the moment developed by the air motor 3, after which the latter stops. After that, the wrench for the handle 2 is rotated relative to the longitudinal axis of the threaded connection for some

the angle, for example for the right thread, is clockwise.

In doing so, the reactive torque from the bevel gear 10 tends to rotate relative to the conical

the gear 11, through the planetary gear 5, the torque limit clutch and the output shaft 4 is transmitted to the sprocket 15 of the one-way clutch, try to turn it in the direction opposite to the original rotation. The rollers 17 are automatically inserted into the wedge slots 24 and wedge an asterisk 15 through the sleeve 16 onto the body 1.

Thus, the reactive torque from the bevel gear 10 is closed to the housing 1, and the entire chain from the spindle 8 to the freewheel becomes rigid, the spindle 8 is rotated with the interchangeable nozzle 23 and the torque is transferred to the threaded connection.

By turning the handle 2 counterclockwise, the rollers 17 roll out of the wedge slots 24, the sprocket 15 wedges and the bevel gear 10 runs freely around the bevel gear 11, idling is performed.

The reciprocating movements are performed with the handle 2, the nut is finally tightened up to the moment determined by the moment of operation of the limit torque coupling. As soon as the moment on the spindle 8 reaches the specified limit value, the driving coupling half 13, overcoming the force of the spring 14, begins to slip relative to the driven coupling half 12.

The end is finished, and the wrench is removed with the nut tightened.

Adjusting the torque limit clutch to the required response time is done by changing the degree of compression of the spring 14 with the help of an adjusting nut 25.

Claims (1)

Invention Formula A pneumatic angle wrench, comprising a housing, an air motor with an output shaft, a planetary gearbox having a central wheel with external teeth and a carrier, a spindle with a turnkey head at the end connected to the carrier through bevel gears, and a limit torque coupling, including a driven coupling half rigidly connected to the central gear wheel with external teeth, and a driving coupling half mounted on the output shaft with the possibility of joint rotation and relative axial movement and spring-loaded to the driven half coupling, which is due to the fact that, in order to expand the technological capabilities by expanding the range of .types of tightenable threaded connections, it is equipped with a free running coupling, which is located on the output shaft between the air motor and the coupling coupling half of the limiting torque an asterisk fixed in the housing of the holder and the rolling elements placed between the latter and the asterisk.