SU1219219A1 - Impact-action electromagnetic drive - Google Patents

Description

The invention relates to mechanical engineering, in particular, to the design of equipment for pressure treatment with an electromagnetic drive and control systems for this drive.

The purpose of the invention is to increase the efficiency of the electromagnetic drive by eliminating the premature switching of the hammer to idle (reverse) stroke and ensuring accurate control of the working position of the hammer after each impact, taking into account the draft forging.

Fig. 1 shows an electromagnet of an impact drive with an inductive position sensor, a general view; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. one; in fig. 4 shows the layout of electromagnets and sensors in the drive unit; in fig. 5 - connection diagram of the windings of the sensors.

An electromagnetic percussion actuator contains electromagnets of working 1 and idling 2 strokes mounted on a nonmagnetic guide 3 and adjacent to the lower pole of the electromagnet .1 of the working stroke is a ferromagnetic core, made in the form of a hollow dilidra 4, in which the upper and lower bases 5 made of non-magnetic material in the form of flanges, and a system of main pole pieces (Fig. 3 consisting of four removable pole pieces 6, located in the same plane at right angles to one another and Ferromagnetic head 7, part of its length included in the no-load electromagnet 2, is located in guide 3 under the main pole tips 6. Strike holes in through step holes that are made on the side wall of hollow cylinder 4 and on corresponding holes in guide 3 7 is in contact with the ferromagnetic tool 8, which is part of its length in the guide 3. The tool 8 has a technological stroke L defined by the initial A and end B positions of the tool 8 (Fig. 2).

On the side wall of cylinder 4 at a distance not less than the technological stroke L of tool 8, a system of additional pole pieces 9 is installed, the system of main pole tips is identical

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NICK 6, i.e. consisting of four additional pole lugs 9, located in one plane at a right angle one to the other, 5 installed in through stepped holes, made on the side wall of cylinder 4, and in the corresponding holes in the guide 3.

10 Four open magnetic circuits each; consists (fig. 2.)

From the main 6 and additional 9 pole tips and part of the ferromagnetic cylinder 4, each of which, at a distance not less than the technological stroke L of the tool 8, is closed at the moment of impact the contacting head 7 and the tool 8,

On each main pole tip 6 is placed in one section

10 field windings f which are connected to the supply transformer

11 (Fig. 5) in such a way that they create in contacting the striker

25 7 and instrument 8 magnetic fluxes have the same direction. On each additional pole tip 9, one section 12 of the output winding is placed, which are connected in series so that their signals are summed.

The pin 7 is extended by an amount not less than the technological stroke L of the tool 8.

The sensor 13 of the working position of the cylinder (Fig. 4) is adjacent to the lower pole of the electromagnet 1 of the working stroke. The main 6 and additional 9 pole tips are held by retaining rings 4. The signal taken from the sensor 13 is fed through the rectifying bridge 15 to the idle electromagnet 2 control circuit. Sensor 16 of the initial position of the striker, adjacent to the upper pole of the electromagnet 2 of idling, serves to control the supply of current pulses to the electromagnet 1 of the stroke (before the start of the stroke). The sensor 16 consists of a ferromagnetic core, hollow in the form of a hollow cich indra, in which the upper and lower bases are made of non-magnetic material in the form of flanges, a system of pole pieces 17,

55 consisting of four removable pole pieces, located in one piece at an angle of one to the other and installed.

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new through step holes made on the side wall of the cylinder and into the corresponding holes in the guide. On each of its four pole tips there is one section of the field winding and one section of the output winding. Therefore, this sensor 16 provides a signal to turn on the electromagnet 1 of the working stroke at the moment when the striker 7 enters its pole pieces 17.

Electromagnetic percussion actuator works as follows

In the initial position of the die 7 era, the sensor 16 is fed and the power is supplied to the electromagnet 1 of the working stroke, which accelerates the head in the direction of the tool 8. At the moment of the impact of the die with the tool, a working deformation of the forging occurs. In this case, the moment of the working operation is accurately recorded by the sensor 13 at the point of contact of the striker 7 with the tool 8. The sensor 13 is connected in such a way (Fig. 5) that when applying voltage from the supply transformer 1 to the section 10 of the excitation winding, the section 12 of the output winding appears only at the moments of contact of the striker 7 with the tool 8. At other times, i.e. when the striker 7 is not in contact with the tool 8, an air gap arises between the striker and the tool, the magnetic resistance of which is significantly greater than the magnetic resistance of the ferromagnetic portions of the magnetic circuit consisting of the ground 6, additional 9 pole pieces, ferromagnetic cylinder 4, the striker 7, tool 8 and mentioned air gap. Therefore, we can assume that the signal taken from the output winding of the sensor 13 in the absence of contact of the striker with the tool is close to zero

Consequently, throughout the entire technological stroke L of the tool 8, the signal taken from the output winding of the sensor 13 is fed into the control circuit of the electromagnet

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the stroke for switching on the latter is always at the moment of striking the striker 7 over the tool 8. When the instrument 8 is lowered after each stroke (by the amount of deformation), this condition is preserved and the idle electromagnet is turned on The reverse of the striker occurs only at the moment or somewhat later of the impact of the tool on the forging.

Thus, the use of the proposed drive with sensors in percussion machines, in which the stroke of the striker changes during operation due to the presence of the technological stroke of the tool, eliminates the reduction of the impact energy and the occurrence of additional shock loads caused by an early blow. the tool, the inclusion of the electromagnet idling throughout the entire technological course of the tool. At the same time, the sensor 13 throughout the entire technological stroke of the tool automatically takes into account changes in the parameters of the operating machine, such as, for example, a change in the force of resistance to movement of the striker, a change in the stroke of the striker, heating of the windings of electromagnets, etc., i.e. The sensor 13 is not affected by the mentioned machine parameters and always issues a signal to connect the idling electromagnet only at the moment of contact of the striker with the tool, i.e. only at the moment of impact.

In addition, there is the possibility of using the phenomenon of rebound striker from the tool. The striker after striking is pulled into the electromagnet of idling not from a state of rest, but after a rebound of the tool and the striker, having a certain initial speed determined by the conditions of the rebound, which facilitates the operation mode of the electromagnet of idling and makes it more economical.

This achieves the positive economic effect of using an electromagnetic percussion actuator.

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Compiled by V. Stokolov Editor E. Papp Tehred I. Veres Proofreader E.

Order 1189/15 Circulation 655Subscription

VNISH1I USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, U-city, ul, Proektna,

in the control of the magneto 1 m - Aosta code

5

Claims (1)

ELECTROMAGNETIC DRIVE OF SHOCK ACTION, containing electromagnets of working and idle mounted on a non-magnetic cylindrical guide, in which are mounted moving and contacting each other ferromagnetic strikers and tools, as well as supply transformers with rectifier bridges. And two induction sensors for the initial and working positions of the striker, made in the form of four removable pole pieces located in the same plane at right angles to each other and mounted in the holes of the hollow ferrom cylinder head, the base of which is made of non-magnetic material in the form of flanges, while on the pole lugs are placed sections of the field winding connected to the supply transformer, and interconnected in series sections of the output winding connected to the rectifier bridge, characterized in that, for the purpose increase the efficiency of the drive by eliminating the premature inclusion of the idle electromagnet and ensuring accurate determination of the moment of the working. operation, the induction sensor of the working position of the striker is made in C * de of two identical systems of four <2 removable pole pieces - the main one located at the working end of the striker and the extra one located at the end of the tool in contact with the striker, while the distance between the main and additional pole piece systems is set to at least the largest technological stroke tool, and sections of the field winding of the working position of the striker of the sensor are placed on the main system of pole pieces.