RU2278775C1 - Pneumohydraulic pulse type nut driver - Google Patents

Abstract

FIELD: machine engineering.

SUBSTANCE: nut driver includes housing with handle, pneumatic motor arranged in housing and having outlet shaft joined with hydraulic pulsating amplifier in the form of eccentric sleeve in which rotor is mounted. Rotor provided with spring-loaded blade is rigidly joined with spindle of nut driver. On inner surface of sleeve there are sealing jaws forming together with rotor and with blade high-pressure and lower-pressure chambers with openings for overflow of working liquid from high -pressure chamber to low-pressure chamber. Nut driver also includes pulse generator and electromagnet arranged in rotor of hydraulic pulsating amplifier. Electromagnet engages with blade and it is connected with pulse generator.

EFFECT: increased torque created by nut driver at tightening threaded joints.

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Description

The invention relates to mechanical engineering, namely to mechanized percussion instruments, and can be used in any industry for disassembling and assembling threaded joints.

Known pneumatic-hydraulic pulse wrench containing a housing with a handle, a pneumatic motor placed in it, the output shaft of which is connected to a hydraulic pulsating amplifier made in the form of a sleeve with an eccentricity, inside of which a rotor with a spring-loaded blade is placed, rigidly connected to the wrench spindle, the inner surface of the sleeve has sealing sponges forming two high and low pressure chambers with a rotor and a blade, and with holes for the flow of working fluid from the high pressure chamber into the low-pressure chamber (see AC 1524992, class B 25 V 21/00 from 04/18/08).

The disadvantage of this wrench is not high enough torque developed by a wrench when tightening threaded connections.

The purpose of the invention is to increase the magnitude of the moment developed by a wrench.

This goal is achieved in that the wrench is equipped with a pulse generator and an electromagnet located in the rotor of a hydraulic pulsating amplifier, interacting with the blade and connected to the pulse generator.

Figure 1 shows a wrench, profile section; figure 2 is a section aa in figure 1 during the action of the pulse from the pulse generator; figure 3 is a section aa in figure 1 during a pause at the output of the pulse generator.

Pneumohydraulic pulse wrench contains a housing 1 with a handle 2, an air motor 3 located in it, the output shaft 4 of which is connected to a hydraulic pulsating amplifier made in the form of a sleeve 5 with an eccentricity, inside of which is placed a rotor 6 with a spring-loaded blade 7, rigidly connected to the spindle 8 of the wrench .

The inner surface of the sleeve 5 has sealing lips 9, forming with the rotor 6 and blade 7 two chambers 10 and 11 of high and low pressure with two openings 12 and 13 for overflowing working fluid from the high pressure chamber 10 to the low pressure chamber 11, an electromagnet 14 installed in the rotor 6 and interacting with the blade 7, and the pulse generator 15, the outputs connected to the inputs of the electromagnet 14.

Pneumohydraulic wrench works as follows.

When the air motor 3 is turned on, the rotation of its output shaft 4 is transmitted to a hydraulic pulsating amplifier, which starts to rotate at the speed of the air motor 3 and serves as an inertial mass.

Up to a certain moment of rotation, its kinetic energy is transmitted to the spindle 8 due to the viscosity of the working fluid and is used to screw on a nut or bolt (not shown).

After contacting the end face of the nut with the supporting surface of the mating part (not shown in the drawing), a pulse generator 15 is turned on, generating pulses whose duration is set as a multiple of the rotation period of the engine 3, and the pause is set equal to the rotation period of the engine 3.

Since after contacting the nut end face with the supporting surface of the assembly, the moment on the spindle 8 of the wrench increases, the spindle 8 stops, and the sleeve 5, continuing to rotate and interacting with the blade 7, introduces the latter in contact with the poles of the electromagnet 14, and the blade 7 is fixed by the electromagnet 14 into in this position, and the sleeve 5 continues to rotate freely, without interacting with the blade 7 and thus acquiring a high speed.

The duration of the acceleration is determined by the pulse duration of the generator 15 and is set to a multiple of the rotation period of the air motor 3, the longer the pulse duration, the greater kinetic energy the sleeve 5 will accumulate during acceleration.

After the end of the pulse, the electromagnet 14 ceases to interact with the blade 7, the blade 7 leaves the groove of the rotor 6 under the action of a spring and begins to interact with the inner surface of the sleeve 5. At some point in time, a situation occurs in which the sealing lips 9 with the rotor 6 and the blade 7 briefly divide the sleeve cavity into two chambers. In this case, the rotation of the sleeve 5 is sharply inhibited and the pressure in the chamber increases. The torque arising during braking of the sleeve 5 is transmitted to the spindle 6, which tightens the threaded connection.

After the sleeve 5 passes through the sealing zone formed by the sealing lips 9, the rotor 6 and the blade 7, acceleration of the sleeve 5 begins and when a pulse arises at the output of the generator 15, after the sleeve 5, in its movement, interacting with the blade 7, brings it into contact with the electromagnet 14 and the blade 7 is fixed by the electromagnet 14.

Since the attractive force of the magnet 14 is greater than the force developed by the spring, the blade 7 with the further movement of the sleeve 5 ceases to interact with its surface and remains in a retracted state, without interfering with the acceleration of the sleeve 5.

After the end of the pulse, the blade under the action of the spring begins to interact with the inner surface of the sleeve 5, creating at a certain point in time a torque pulse, which is transmitted to the spindle 6 of the wrench, tightening the threaded connection.

Then the process is repeated again in the same sequence.

By adjusting the pulse width of the generator 15, it is possible to adjust the acceleration time of the sleeve 5 from one period of rotation of the engine to 10-15 periods, increasing the energy accumulated by the sleeve 5 during acceleration, and, accordingly, the torque pulse on the wrench spindle.

The use of a pulse generator and an electromagnet installed in the rotor of a hydraulic pulsating amplifier, interacting with a blade and connected to a pulse generator, can increase the torque developed by a wrench by increasing the acceleration time of the sleeve of a hydraulic pulsating amplifier.

Claims (1)

A pneumatic-hydraulic pulse wrench containing a housing with a handle, a pneumatic motor placed in it, the output shaft of which is connected to a hydraulic pulsating amplifier made in the form of a sleeve with an eccentricity, inside of which a rotor with a spring-loaded blade is placed, rigidly connected to the wrench spindle, while the inner surface of the sleeve has sealing jaws forming with a rotor and a blade a high and low pressure chamber with openings for the overflow of working fluid from the high pressure chamber in the chamber low pressure control, characterized in that the wrench is equipped with a pulse generator and an electromagnet located in the rotor of the hydraulic pulsating amplifier, interacting with the blade and connected to the pulse generator.

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