SU647138A1 - Screw press drive - Google Patents

Description

(54) SCREW DRIVE

The biotective asynchronous short-circuited machine 5-6 has a rotating rector 5 and a counter-rotor (stator) 6. When the machine is operated in DIGITAL mode, the rotor and counter-rotor rotate in opposite directions, and the moments on the rotor shaft of the counter-rotor are equal in any mode of operation. The voltage applied to the counter-rotor (or rotor) winding is applied through a sliding current collection 1O.

The drive motor, depending on the purpose of the press, can be a TieM direct current motor with parallel excitation. Or an asynchronous motor with a phase-rotor, if regulation of operating modes in a wide range is required, an asynchronous short-circuited engine, if not required a wide range of regulation, a synchronous engine, need to improve the power factor of the enterprise. In two cases, a birotative machine must have a winding with a variable number of pole pairs.

The battery 8 may be spring, gas or hydraulic, adjustable or not adjustable.

Brake 9 is normally engaged, has a spring or other drive, which is input when there is voltage on the drive motor 7.

The device works in the following way.

Let the slider 2 be in the lower position, the electric part of the press is de-energized, the brake 9 is applied to the screw 4, the battery 8 is discharged.

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The voltage is applied to the drive motor with a constant current of 7 and into the control circuit of brake actuator 9, and the brake 9 is removed from screw 4 and remains in the cocked state. The motor 7 is started up and its speed is set to the synchronous speed of the bi-active asynchronous machine 5-6. The voltage is applied to the winding of the counter-rotor 6 with such a sequence of phases that the direction of rotation of the magnetic field is opposite to the direction of rotation of the drive motor 7. At the same time, the rotor 5 remains stationary, since the rotating magnetic field of the mask relative to the rotor is stationary. Therefore, turning on the machine 5-6 into the network will not cause the occurrence of any starting currents.

The rotational speed of the counter-actuator 6 decreases by increasing the excitation current of the drive motor 7. The rotational speed of the rotor 5 gradually increases, while the biotective machine 5-6 works in generator mode in parallel with the network, and the power of the drive motor; 1H 7 is consumed to rotate the flywheel 5.,

The slider 2 moves to the upper position and, when it rises to a predetermined height, comes into contact with the battery stem 8. The resistance force on the slider increases, and therefore the torque on the engine 7 increases, and the speed of rotation decreases. If, in this case, the excitation current n6 varies, then at a certain value of the resistance force, the slider will smoothly stop and be held in the upper position without applying the brake. The engine load will be maximized at the same time, however, the power will be consumed from the network only needed to cover the losses in the machines, the top box and the wires.

When the excitation current of the engine 7 decreases, the speed of its rotation increases. The speed of rotation of the counter-rotor 6 also increases. This leads to the unloading of the engine 7 and to the movement of the PoPa 2 of the vyiz under the action of the elastic forces of the accumulator and the weight of the heel. The rotor 5 begins to rotate in the direction opposite to counter-rotor 6. After the rotational speed of the counter-rotor reaches the rotational speed of the field, the rotor 5 will receive from the engine 7, since the direction of rotation of the rotor B from the engine 7 will change to the opposite and will correspond to the direction of movement of the slide way down. .- .. ... . ; , .,,,,

Thus, the accelerated movement of the slider 2 by the action of the elastic forces of the battery 8, the weight of the slider 2, and the torque of the engine 7. At the same time, the energy reserve of the battery 8 and engine 7 can be adjustable.

Claims (2)

When the slide 2 is in contact with the workpiece, the flywheel-rotor 5 gives energy to the deformation. It is not necessary to pre-disable the engine 7 (by increasing the excitation current), since it does not threaten emergency mode. Therefore, the energy from the engine 7 flows all the way through the slide. If, after deformation, it is required above: to put the product under the action of forces within the maximum working torque of the engine 7, then for this, the excitation current of the motors 7 is reduced to the desired limit. If there is no need in the exposure of the product, then the current excitation of the engine 7 changes in the direction of an increase in the start of defacement (or somewhat earlier), and the cycle is slowed down. In the case when the press does not require a wide range of control of operating modes and the losses in the adjusting rheostat of an asynchronous motor with a phase-wound rotor are economically justified, then an induction motor with a phase-wound rotor can be used as the driving motor 7. The operation of the device is similar to that described, only the rotational speed of the drive engine 7 is controlled by changing the resistance of the adjusting rheostat in the circuit of its rotor. If the drive motor 7 is an asynchronous squirrel-cage rotor, then the biotective asynchronous machine 5-6 has a counter-rotor winding -6 with a variable number of pole pairs for two different speeds of rotation of the field. Let, for example, the drive motor 7 has a synchronous rotational speed, and the speeds of the floor of the machine will be 5-6 RPM and 60O RPM. Then the rotation speed of the rotor S (when the counter-rotor rotates 0 from the engine 7 against the floor) will be (Op 75b-1OOO -.250 rpm, .Ci) pjj 750-6OO 150 rpm, i.e. when switching the number of pairs of poles of a birotational machine, the direction of rotation of its rotor changes. Consequently, the order of operation of the device in this case is the same as the osciller above, only a change in direction. the motion of the slider occurs when switching the number of pole pairs of the counter-rotor 6. Since the driving motor 7 is operating in a continuous mode, it is possible to use a synchronous machine, which is partially used to improve the Power Factor. It does not require devices to start a synchronous motor 7, since it can be started from an asynchronous birsotive machine 5-6. Slider 2 is in the lower position, brake 9 is superimposed on screw 4, voltage is applied to the winding of greater speed of rotation of the field, and when the rotor 5 is braked, drive motor 7 is spun. When the synchronous machine reaches the synchronous speed, voltage is removed from machine 5-6 and voltage is applied The engine 9 is released from the screw 4, and then the device is operated similarly as described above. In all variants, brake 9 is not used in the operating modes of the device. Its purpose is to stop the slide when the drive motor is suddenly disconnected, which is dangerous if the slide is not in the lowest position. When the engine 7 is turned off, the holding brake 9 in the cocked state is switched off, and the drive (spring, pneumatic, hydraulic cargo) applies 4 brake rings to the screw 4. Claims 1. A screw press drive comprising a drive induction motor with a rotor flywheel associated with a screw, which is equipped with an additional motor to increase efficiency and durability, while the motor with a rotor flywheel is made birotative, and its counter-rotor is rigidly coupled to the rotor of the additional motor. 2. The drive according to claim 1, about tl and h and yushchi and with the fact that the motor is biroactive is made two-speed. Sources of information taken into account in the examination 1.Certificate of certificate NO 121342, cl. VZO B 1/22, 1957. 2. Author's certificate N9 153641, cl. B 30 B 1/18, I960.