SU859260A1 - Vibration-type hopper loading apparatus - Google Patents

Description

(54) VIBRATION BUNKER LOADING DEVICE

one

The invention relates to mechanical engineering and can be used to feed piece blanks into a treatment zone.

A known bunker-loading device designed to stabilize the amplitude of oscillations of a bunker when the mass of the load and the network voltage varies, containing a bunker, an electromagnet with a coil, and a feedback circuit (1.

However, the presence of gaps in the kinematic links, the inertia of the moving parts of the feedback circuit and the wear of the vibro probe deteriorate the quality of stabilization and lead to a decrease in performance. In addition, the large size and increased requirements for vibration isolation of the supporting surfaces limit the field of application of the device.

It is also known vibratory bunker. a loading device containing a bunker, an electromagnet with a coil, a sensor and a control unit, the input of which is connected to the sensor, and the output is connected to an electromagnet coil, in which the oscillation amplitude of the bunker is automatically stabilized according to the deviation of the controlled magnitude of the electromagnet supply voltage from a given level, corresponding to a given speed of vibrotransport. 2.

The disadvantages of this device are the fragility of the sensor operation with large amplitudes of oscillations of the bunker. Because of the damage to the contact leads of the resistance strain gages and the need for periodic balancing of the bridge circuit, which leads to a decrease in the reliability and performance of the vibratory bunker loading device.

The purpose of the invention is to increase the reliability of the vibratory bunker loading device.

The goal is achieved by the fact that the sensing element of the sensor is made of a piezoceramic material and is connected to the bunker via an elastic element, and the intrinsic oscillation frequency of the sensor is less than the frequency of the forced oscillations of the bunker.

Claims (2)

As a result, the sensor operates at large amplitudes of the oscillations of the bunker due to the damping of the oscillations of the sensor by an elastic element, and there is no need to periodically adjust the electrical circuit. FIG. 1 shows the device, a general view; in fig. 2 - the same electrical circuit. The vibrating hopper loading device contains a hopper 1, an electromagnet 2 with catuips, a piezoceramic sensitive element 3 with a load 4 protected by a casing 5. The electrical leads of element 3 are connected to the control unit 6, where all the other elements of the electrical circuit are mounted. The piezoceramic element 3 is connected to the bunker via the elastic element 7. The control unit consists of a matching amplifier U4 and a mean value rectifier built on the base of amplifier U6 together with a full-wavelength amplifier D7, separator C5 and filtering chain R9-C8. The output of the amplifier-conversion unit is connected to a comparison circuit made on the potentiometer R10. The output of the comparison circuit is connected to the control circuit of the thyristor D22, connected in series with the coil of the electromagnet 2. The control circuit of the thyristor D22 consists of transistors T14 and T18, Zener diode D19, capacitance C15, resistors R11, R12, R13, R17, R20, R21 and potentiometer R16. The power of the amplifier-conversion unit is provided by a stabilized DC voltage source consisting of a step-down transformer Tr24, a D25 full-wave diode rectifier, an electrolytic capacitor C26 and CCD, a Zener diode D29, a transistor T28, and a resistor R27. The device works as follows. When the device is connected to the network, the actual voltage value on the coil of the electromagnet 2 will be determined by the delay time of the pulse opening thyristor D22. The time delay of the pulse relative to the beginning of the half period is determined by the charging time of capacitor C15, which is proportional to the collector current of transistor T14. The collector current of the transistor T14 depends on the magnitude of the feedback voltage taken from the RIO power meter. At a fixed position of the slider of the potentiometer R10, a certain current flows through the coil 2 of the electromagnet, and the bunker 1 is loaded with a certain amplitude. At the same time, the oscillations of the hopper 1 are transmitted through the Routes element 7 to the piezoceramic element. 3 with a load of 4, which leads to the appearance of an alternating voltage on the electrical contacts of the piezoelectric element, which is amplified and converted into direct voltage by means of an amplifier-transforming unit. The feedback voltage taken from the slider of potentiometer R10 has a well-defined value corresponding to the amplitude of the hopper oscillations. When the loading mass of the vibrating charging device changes, the oscillation amplitude of the hopper, for example, decreases. In this case, the magnitude of the voltage removed from the calibration of the potentiometer R10 decreases. This leads to an increase in the collector current of the transistor T14, the charging time of the CIS capacitor decreases, and the effective value of the voltage on the coil of the electromagnet 2 increases, i.e. The oscillation amplitude of the hopper 1 is automatically stabilized. The use of the proposed device significantly improves the performance and reliability of the vibratory bunker unloading devices by increasing the allowable loading masses and the speed of the vibration vibrating machine. Vibration hopper loading device comprising a hopper, an electromagnet with a coil, a sensor and a control unit, the input of which is connected to the sensor, and the output to an electromagnet coil, characterized in that the sensitive element of the sensor is made of a piezo-ceramic material and connected to the bunker through an elastic element, and the natural frequency of the sensor oscillations is less than the frequency of the forced oscillations of the bunker. Sources of information taken into account during the examination 1. USSR author's certificate N ° 201888, cl. 23 Q 7/00, 1965. 2. USSR author's certificate according to the application N 2635761 / 22-03, cl. In 65 G 27/00, 1978. 4 5 Pt / 2. /