Oscillating indicator of a level

FIELD: the invention refers to measuring technique and may be used for controlling bulk and liquid materials.

SUBSTANCE: the oscillating indicator of a level has a sensible element( a probe) 1 connected with an anchor 2, a driving arrangement 4 in the shape of a coil with a ferromagnetic core and also a sensor 5 of the displacements of the anchor, a drive-pulse generator 6 and an amplifier 7 and a relay block 9 successively connected. The amplifier is spanned with a regulated negative feedback fulfilled in the shape of a resistor 8. The sensor 5 of the displacements of the anchor may be fulfilled in the shape of a coil with a ferromagnetic core. At that the section of the anchor 2 between the coils is fulfilled out of non-magnetic material that prevents electromagnetic connection between the coils providing protection from high frequency oscillations in the system anchor-coil-amplifier.

EFFECT: allows to control the levels of the bulk and liquid materials being present in aggressive mediums, under pressure,( discharge)and at temperature till 200 degrees.

2 dwg

 

The invention relates to measuring technique and can be used for level control of bulk and liquid materials.

Known vibrating level switch for bulk and viscous products, France application No. 2441151, G 01 F 23/00, 1980, comprising a generator for stepwise excitation in the mechanical system. The generator output is connected to the level sensor of the controlled product and the input of the amplifier, the output of which is connected to the signal device, as well as through the schema constraints, and a differentiating circuit to the generator input.

Known vibrating level switch bulk materials, patent of Russia № 2047104, G 01 F 23/00, 1995, containing the sensitive element in the form of the vibrating probe with a tip in the shape of the blade, the second end of the probe used as anchors Converter movements, two hard stops located on opposite sides of the probe, the electromagnet and the spring, dilatory armature from the electromagnet. The dipstick under the action of the pulse current supplied to the electromagnet, and a spring oscillates motion with periodic shock anchors about the stops.

These detectors have a number of major disadvantages:

- constant pulse excitation of mechanical oscillations of the sensing element causes a mechanical "shoveling" of material, which reduces the accuracy of identifying the ia level, and for pulverized materials and liquids such detector is generally not applicable;

- indication of the moment of contact of the probe material is difficult because it is not strictly relay in nature and requires additional electronic components (amplifiers, bandpass filters, etc), which complicates the circuit of the signalling device.

Known vibration level switch, A.S. USSR № 1211610, G 01 F 23/00, 1986 (prototype)with the associated sensor (probe) mechanical oscillatory system with excitation device in the form of a coil with a ferromagnetic core, the pulse generator and connected in series band-pass filter, amplifier and relay unit. The detector has a parametric motion sensor sensitive element (probe)connected as an amplifier and oscillator. The generator generates short pulses of positive polarity and longer pulses of negative polarity. Positive pulses are received on the coil and shock excite the mechanical oscillatory system. In the presence of a controlled material mechanical oscillatory system campfires, which is reflected by the change in input current sensor power supply move.

This indicator for the reasons mentioned above, also has a low precision response scheme registration level is difficult, and it unsuitable for liquid and pulverulent materials.

Object of the invention is the provision of a high-precision operation and simplification of the circuit.

The task of deciding what to register the level of granular and liquid materials in vibration detector containing associated with the sensitive element of the anchor and the excitation device in the form of a coil with a ferromagnetic core, the sensor anchor movements, the pulse generator and connected in series amplifier and relay unit, the sensor anchor movements made in the form of a coil with a ferromagnetic core, the first output of which is connected to the not inverting input of the amplifier, the amplifier is covered by an adjustable negative feedback, made in the form of a variable resistor, and the output is connected to the first output coil excitation device, with the control input of the generator and through a variable resistor with its inverting input, while the other end of the resistor and the second terminals of the coils of the sensor movements of the armature and the excitation device is connected to a common point, and a portion of the anchor between the coil excitation device and the coil sensor displacements of the armature is made of a nonmagnetic material.

Figure 1 shows the block diagram of the proposed detector; figure 2 - plot of stresses on the individual units.

Vibration working intensively on the ATOR level of bulk and liquid materials contains the sensing element (probe) 1, associated with the armature 2 having 3 phase of a nonmagnetic material, and the excitation device 4 in the form of a coil with a ferromagnetic core, and the sensor 5 anchor movements in the form of a coil with a ferromagnetic core, the pulse generator 6, connected in series amplifier 7 covered adjustable negative feedback, in the form of resistor 8, and the relay unit 9.

Section 3 of non-magnetic material of the armature 2 is located between the coil excitation device and the coil sensor anchor movements, it prevents electromagnetic coupling between the coils, providing protection against high-frequency oscillations in the system of the anchor coil-amplifier.

The first output of the sensor coil moves the armature is connected to the not inverting input of the amplifier, the amplifier output is connected to the first output coil excitation device, with the control input of the generator and through a variable resistor with its inverting input, the other end of the resistor and the second terminals of the coils of the sensor movements of the armature and the excitation device is connected to a common point (item 10 in figure 1).

The detector works as follows.

Before turning on the detector in the work produce its setting in the absence of controlled material in the vessel. Serves the supply voltage when the generator 6. Rez is the second 8 establish the depth of the negative feedback amplifier 7 so to self-oscillations that appear in the system anchor-coil-amplifier due to positive Electromechanical feedback, did not arise by themselves, but required additional impulse to run as a mechanical push rod or anchor. Include generator 6, which is one short impulse applied to non-inverting input of the amplifier 7, starts the system anchor-coil-amplifier in self-oscillating mode. At the output of amplifier 7 a signal inhibit generator 6. When the touch probe 1 that is associated with the anchor 2, the surface of the bulk material or liquid self-oscillations in the system can easily break that registers the relay unit 9. The generator 6 when this started, but his rare short single pulses of the relay unit 9 does not register as self-oscillations in the system anchor-coil-amplifier. By decreasing the level of the material being measured, the probe is released from the material and the system goes into self-oscillation mode from the triggering pulse generator 6. As self-oscillations in the system do not occur automatically, but require additional start pulse, they can easily cease from small touch probe the surface of the material. On a stress plot of the output of the amplifier 7 - U7 good view of increasing the amplitude of self-oscillations from small triggering pulse generator 6 plot U6 and sharp breakdown when you touch the probe to the surface of the material, which is worked out relay module 9 - plot U9.

This embodiment of the detector provides high accuracy of its operation in comparison with the known devices and do not require additional electronic chains, simplifying its schema.

The vibrating level switch for bulk and liquid materials containing associated with the sensitive element of the anchor and the excitation device in the form of a coil with a ferromagnetic core, the sensor anchor movements, the pulse generator and connected in series amplifier and relay unit, wherein the sensor anchor movements made in the form of a coil with a ferromagnetic core, the first output of which is connected to the not inverting input of the amplifier, the amplifier is covered by an adjustable negative feedback, made in the form of a variable resistor, and the output is connected to the first output coil excitation device, with the control input of the generator and through a variable resistor with its inverting input, with the other end of the resistor and the second terminals of the coils of the sensor movements of the armature and the excitation device is connected to a common point, and a portion of the anchor between the coil excitation device and the coil sensor displacements of the armature is made of a nonmagnetic material.



 

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