SU1747257A1 - Power nut-driver of impact action - Google Patents

Abstract

The invention relates to a hand tool, in particular, percussion impact wrenches, and can be applied in various areas of mechanical engineering in assembling and disassembling threaded connections. The aim of the invention is to improve maintainability. During operation, the air through channels 23 and 19 enters the working stroke chamber 17, and the piston 8 begins to move toward the anvil 4. The cams 11 of the piston 8 strike the cams 5 of the anvil 4. The air enters the channel 26 into the chamber 15 of the spool 13 and throws the latter is towards the chamber 14. Chamber 17 is connected to the atmosphere, and chamber 18 is connected to the high pressure pipeline. The piston 8 makes an idling. After opening channel 25, spool 13 returns to its original position and the cycle repeats. 3 il.

Description

The invention relates to a hand tool, in particular, percussion impact wrenches, and can be applied in various areas of mechanical engineering in assembling and disassembling threaded connections.

A percussion impact wrench is known, comprising a cylinder body, a spindle with a turnkey head at one end and an anvil with working cams and a threaded rod at the other end, a piston with a central threaded hole for the threaded spindle rod and cams at the end, with anvil cams and spool device.

The closest in technical essence to the invention is a percussion impact wrench, comprising a cylinder body, a spindle with a turnkey head at one end, an anvil located therein.

with cams and a threaded rod on the other, a piston with cams placed at its end, counter-cam anvils, and a spool valve.

A disadvantage of the known device is that the structure does not have sufficient maintainability due to the lack of interchangeability of the main working parts.

The aim of the invention is to improve maintainability.

The goal is achieved by the fact that, in a impact wrench comprising a cylinder body, a spindle with a turnkey head at one end and an anvil with working cams and a threaded rod at the other, a piston with cams at its end, and anvil response cams, and spool

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the device, in the spindle and piston, is made with tapered bores, threaded rod is removable with a smooth conical surface at a part of the length for placing the spindle in the tapered bore, and the wrench is equipped with a nut installed at one end of the threaded rod with one end facing the other end of the threaded rod a rod and a sleeve placed in the tapered bore of the piston with a matching tapered outer surface and a threaded section in it and an additional nut installed on the latter, one end of which is resting on the torus center piston

Fig. 1 shows a general view of a percussion nut driver with an upper piston position, a longitudinal section; Fig. 2 shows a general view of a percussion screw driver with a lower piston position; on fig.Z - section aa in figure 1.

The percussion impact wrench consists of a cylinder body 1, a spindle 2 with a turnkey head 3 and an anvil 4 with working cams 5 and a detachable threaded rod b with a smooth surface of a part length to be placed in the central cone bore of the spindle 2. a nut 7 screwed on it the lower threaded part, the rod 6, the piston 8, in the central conical bore of which is fixed by a nut 9, the sleeve 10 with the counter cone outer surface and the central threaded bore, which includes the threaded rod 6 of the spindle 2. The piston 8 has cams 11, from spindle cam 5 and is made with a groove 12 on the outer surface, which, together with the cylinder body 1, forms a low pressure chamber. At the end of the cylinder body 1 there is a spool device containing a three-plunger spool 13, which forms with the cylinder body 1 end chambers 14 and 15, a trigger button 16 for moving the spool 13 if it is stuck in the valve body and a system of overflow channels alternately blocked by the spool 13 The piston 8 forms with the cylinder body 1 chambers 17 and 18 of working and idling, respectively, which through channels 19,20 and 21, 22 are connected either with the atmosphere or through channel 23 with a pipeline (not shown) high yes laziness. In the cylinder body 1 there is a radial hole 24 located in the middle part and connecting the low pressure chamber with the atmosphere, and two channels 25 and 26 located in the diametral plane parallel to the axis of the housing and connecting end chambers 14 and 15 with the low pressure chamber and a piston cavity at each of the extreme positions of the piston 8.

Impact wrench works as follows.

If the piston 8 is in the extreme upper position, and the spool 13 is at the end chamber 15, the air from the high pressure pipeline through the channels 23 and 19 goes into the sub-piston chamber 17 of the stroke. At this moment, the piston chamber 18 of idling through channels 21 and 22 is connected to the atmosphere and through channel 25 to the end chamber 14 of the spool 13. Under air pressure, the piston 8 performs a translational-rotational movement towards the anvil 4 — a working stroke. At the end of the working stroke, the cams 11 of the piston 8 strike a blow at the working cams 5 of the anvil

0 4. Through the open channel 26, the compressed air enters the end chamber 15 of the spool 13, as a result of which the spool 13 is thrown towards the end chamber 14. The running chamber 17 becomes

5 via a piston and communicating through channel 26 with the end chamber of the slide valve, and through channels 19 and 20 with the atmosphere. The idle chamber 18 through the channels 21 and 23 communicates with the high pressure pipe. After the transfer of the impact energy to the tightened threaded joint (not shown), the piston 8 begins to move in the opposite direction - idling.

After the piston 8 opens the channel

5 to 25, the air enters the end chamber 14 and transfers the spool 13 to the side of the end chamber 15. Compressed air through the channels 23 and 19 begins to re-enter the chamber 17 of the working stroke. The piston 8 goes some way, overcoming the working pressure in the chamber 17 of the working stroke, extinguishes the energy of idling. After extinguishing the idling energy, the piston 8 begins to make a working stroke, the whole cycle repeats.

Claims (1)

5 claims A percussion impact wrench comprising a cylinder body, a spindle with a turnkey head at one end and an anvil with cams and a threaded rod at the other, a piston with cams at the end, and a spool device differing from that, in order to increase maintainability, cone holes are made in the spindle and piston, the threaded rod is removable with a smooth cone surface of a part of the length to be placed in the cone hole of the spindle, and the wrench is fitted threaded on one end stem with a nut, one end face of a cone-shaped outer surface and a spindle threader covering the other end section on it and mounted on the threaded rod and placed in the cone-last additional nut, one sleeve of the piston in the opening of the piston with the tone of the piston K - -b L / J "CHYGN 72 13 2