SU950517A1 - Percussive nut-driver - Google Patents

Description

(SA) SHOCK ACTION WIPER

one

The invention relates to a handheld mechanized tool, in particular, percussion impact wrenches, and can be used in various mechanical engineering fields in assembling and disassembling threaded connections.

A pulse-impact mechanism of a nutrunner is known, comprising a housing, a spindle with a turnkey head at one end and an anvil with working cams at the other, a rotor with sector protrusions and axial and radial air-supporting channels, and a rotor stator with internal rods rigidly connected to the anvil. sector protrusions forming working cavities with rotor protrusions and with working anvils responding to anvils tl Its disadvantage is that it has a relatively small torque, since acceleration darnika produced on rotation angle of less than 180.

The closest to the technical essence of the invention is a percussion impact wrench, comprising a cylinder body, a spindle with a turnkey head at one end 1 of the anvil with working cams and a threaded rod at the other end, a piston with a central threaded hole, which includes threaded spindle rod, and cams at the end, counter anvil cams, and spool mouth, 5 f2j.

However, the design of the wrench has a large number of mating parts and works in conjunction with the device that controls the movement

20 spool.

The purpose of the invention is to simplify the design and expand the technological capabilities by automatically switching the working stroke to idle and vice versa.

The goal is achieved by the fact that the spool device is located at the end of the body and is made with face-shaped chambers, the piston is made with an annular groove on the outer surface, which together with the body-cylinder forms a low pressure chamber, and the body has a radial bore located in the middle part and communicating a low pressure chamber with the atmosphere, and two channels located in the diametral plane parallel to the axis of the body and connecting the end cavities of the slide valve to the low pressure chamber and odporshnevoy cavity communicating with the atmosphere at each of the extreme positions of the piston.

FIG. 1 shows a percussion wrench with the piston in the upper position, longitudinal section; in fig. 2 - the same, with the lower position. Scientific research institute of the piston; in fig. 3 is a section A-A in FIG. one.

The impact wrench consists of a cylinder body 1, a spindle 2 located therein with a turnkey head 3 at one end and an anvil with working cams 5 and a threaded rod 6 at the other end, a piston 7 with a central threaded hole that includes a threaded rod 6 spindle 4. The piston 7 is formed with a bore 9 on the outer surface, which, together with the cylinder body, forms a low pressure chamber. At the end of the cylinder body 1 there is a spool device, including a three-plunger valve 10, which forms with the cylinder body 1 end chambers 11 and 12, a trigger button 13 and a system of bypass channels, alternately overlapped spools.

The piston 7 forms with the cylinder body 1 of the chamber 1 of the working stroke and 15 of idling, which, respectively, through the channels 16 and 18 are connected either to the atmosphere through the exhaust channels 18 and 19. or through the channel 20 with a high-pressure pipeline.

In the cylinder body 1 there is a radial hole 21 located in the middle part connecting the low pressure chamber with the atmosphere and the bottom of the canap 22 and 23. located in the diametral plane parallel to the axis of the housing and connecting the end chambers L and 12 with the low pressure chamber and a piston cavity at each of the extreme positions of the piston 7. In one of the steps of the spool 10 an elastic ring 24 is installed.

The wrench works as follows.

In the initial position, the piston 7 relative to the anvil 4 is located in the extreme upper or intermediate field (pressing the trigger button 13 moves the spool 10 towards the end chamber 12, as a result, air from the high-pressure pipeline (not shown) moves into the supra piston cavity — the chamber AND working stroke. At this moment, the piston cavity — the idling chamber 15 is connected to the atmosphere through channels 17 and 19 and through the channel 23 to the end chamber 11 of the spool 10, the front camera 12 is connected to the channel 22 viscous pressure. The slide is held in the end position the elastic ring 2k.

Under the pressure of air, the piston 7 begins a translational-rotational movement in the direction of the anvil C, the working stroke. At the end of the working stroke, the cam 8 of the piston 7 strikes the working cam 5 of the anvil and opens the channel 22, through which compressed air enters the end chamber 12 of the spool 10, causing the spool 10 to be thrown towards the start button 13. After moving the spool 10, the chamber The working stroke becomes sub-piston, which communicates through channel 22 with the end chamber 12 and through channels 16 and 18 communicates with the atmosphere and the idle chamber through channels 17 and 20 communicates with the high pressure pipeline. After the transfer of the impact energy to the tightened threaded joint, the piston 7 starts to idle (idle in the opposite direction idle. After the piston opens the channel 23. air enters the end chamber 11 and moves the spool to its original position away from the trigger button, as a result compressed air through channels 20 and 16 begins to flow into the chamber of working stroke I. At the same time

the piston 7 goes some way, overcoming the working pressure in the chamber 14 of the working stroke, extinguishes the energy of idling. This path is insignificant, since, due to the small cross section of the exhaust channel 18, the idling speed of the piston is small. After extinguishing the idling energy, the piston 7 begins to make a working stroke and the whole cycle repeats again.

Claims (1)

1. USSR author's certificate №, cl. B 25 B 21/02, 19712. USSR Author's Certificate No. 522957, cl. B 25 B 21/02, 197 (prototype).