SU737601A1 - Apparatus for compacting concrete mortar - Google Patents

Description

(54) DEVICE FOR CONCRETE MIXTURE SEAL

one

The invention relates to devices for compacting concrete and can be used in the construction of large concrete structures, in particular hydroplotins.

A device for compacting a concrete mix is known, which contains a vibrator, a meter for the degree of compacting of the concrete mix in one region of the compacting area, and an organ for moving the vibrator 1.

Another device for compacting concrete is known, which contains a vibrator with a displacement mechanism and thrusters with a control unit 2.

In known devices, the compaction of a concrete mix is determined by external signs, and then the vibrator is moved to a new location. Therefore, there is no analog in them, the optimum dependence of the vibrator on the degree of compaction of the concrete mix.

The purpose of the invention is to improve the quality of compaction of the concrete mix and the performance of the device.

This is achieved by the fact that in the device for compacting the concrete mix, containing a vibrator with a displacement mechanism, propellers with a control unit, measuring instruments for the degree of compacting of concrete are introduced. mix, subtractor unit, power source and nonlinearity unit consisting of a transistor and resistors, the concrete mix meter measuring devices being connected to the power supply unit and connected to the output of the subtractor unit whose input is connected to the common connection point of the transistor and to one of the resistor terminals ,

10 other conclusions which are connected to the collector and the emitter of the transistor.

 FIG. 1 shows a diagram of a device for compilation: a concrete mix with basic control units; in fig. 2 - functional scheme of the control device.

15

The device contains a vibrator 1, meters 2 and 3 of the degree of compaction of the concrete mix, the control unit 4, consisting of a reader 5 and a nonlinearity unit 6, the node

20 7 driving control 8, providing movement to the machine 9, power supply unit 10 with adjusting resistors 11 and 12 and a transformer 13. Subtractor 5

consists of two rectifying bridges 14, 15, connected in opposite, adjusting resistors 16, 17 and resistor 18. Nonlinearity unit 6 consists of transistor 19, adjusting resistor 20 and resistor 21.

The device works as follows. .

From the secondary windings of the transformer 13, the alternating current voltage is supplied to the resistors 11, 12 connected according to the potentiometer circuit. Parts of these voltages (set up during adjustment) through meters 2, 3 of the degree of compaction of the concrete mixture go to the calculator 5, which consists of two rectifying bridges 14, 15.

Each of the 2 and 3 gauges of the degree of compaction of a concrete mix generally consists of two electrodes, isolated from each other.

The resistances of the gauges vary in proportion to the degree of compaction of the corresponding regions of the sealing region. During operation, the voltage vibrator 1 after the meters 2 and 3 continuously changes due to the continuous change in the resistance of the meters 2 and 3.

These voltages are fed to the input of the subtractor 5, as a result of which a continuous signal is found at its output, which is proportional to the resistance difference between the two regions of the compacted region. From the output of the subtractor, the signal enters the input of the nonlinearity unit 6, which can be implemented as a transistor 19 and resistors 20, 21. The nonlinearity unit is pre-tuned to the dependence of the optimal rate of change of the compacted region on the difference of resistance there is a signal proportional to the optimal rate of change for the region to be compacted.

Block 6 nonlinearity works as follows.

In the initial operating position, the transistor 19 is in the closed position due to the fact that the positive potential at the base of the transistor against the voltage that is released in the resistance section exceeds the negative potential at the resistor 20. This is possible when the meter 2 of the seal is closer to the vibrator than the meter 3. The resistance of the meter 2. less than

The meter 3, therefore, at the output of the bridge 14, the voltage is higher than at the output of the bridge 15. As they are directed oppositely, the voltage of the indicated polarity is separated in section 22-23.

When compacting concrete, the resistance of meter 3 will decrease faster than meter 2 (the voltage across bridge 15 will increase faster than at the output of bridge 14). The base potential of the transistor will become more negative, and the conductivity of transistor 19 will similarly increase. Change the conductivity of the transistor with, using one; One of the known engine control units 7 changes the speed of the machine as a function of compacting the concrete mix; ,AND

Claims (2)

1.Soshin A.V. Building Technologists; production. M., stroiizdat, 64, p. 219-220., 2. USSR author's certificate No. 143705, cl. E 04 G 21/08, 61.CSJ w