SU379745A1 - DEVICE FOR THE PROTECTION OF METAL CONSTRUCTION - Google Patents

Description

one

The invention relates to safety devices and signaling and control units for excavators, spreaders and similar machines.

A device for protecting the metal structure of the boom, for example, spreaders and rotary excavators from overloading, includes a running load sensor, a sensor for monitoring the movement of a conveyor belt and a threshold element built into the emergency stop circuit of the equipment.

The purpose of the invention is to prevent the excavator from shutting down with short-term local increases in linear load.

This is achieved by the fact that the inputs of the reversible integrator, which is connected to the threshold element and the indicator, are connected directly and through the delay node to the output of the running load sensor.

In this case, the linear load sensor can be made: with a frequency converter, and the lag node - in the form of a sequential register, the forward pulse circuit of which is connected to the belt motion control sensor.

In addition, a reversible integrator can be kinematically connected by means of a differential with a threshold element and an indicator.

FIG. 1 shows a diagram of the device;

in fig. 2 is a reverse integrator circuit;

in fig. 3 is a reverse integrator circuit.

and a delay node made in the form of a sequential register.

The proposed device includes a sensor / running load, mounted on the conveyor 2 boom 3 rotary excavator. This sensor contains dynamometers 4, output

which is connected to the frequency converter 5, and the power supply through the power supply node 6 to the sensor 7 for monitoring the movement of the conveyor belt. The inputs 9 and 10 of the reverse integrator are connected to the output of the sensor / running load directly and through the node 8 of the echelon. The sensor 7 of the control and the reversible integrator P are made frequency, and the delay node can be made in the form of a serial register,

The chain 12 of the pulses promoting them is connected to the sensor 7 for monitoring the movement of the tape. A reverse integrator // consists of two stepper motors 13, 14 kinematically coupled through a differential

5 with a threshold element 16 and an indicator 17. It is also possible to use electronic pulse counters as a reverse integrator, a decoder 18 as a threshold element, and a digital indicator 19 connected to the decoder, for example, digital lamps as an indicator.

If it is necessary to provide information about the load distributed on a given boom area in the form of an electrical signal, for example, voltage, the reversible integrator 11 and lag node 8 can be made as one common serial register 20, the input 21 of which is connected to the frequency converter 5 1 running load, and a chain of 12 pushing pulses connected to the frequency sensor 7 to monitor the movement of the conveyor belt. The outputs of each of the cells 22 of the register 20 are connected to normally closed contactless keys 23, bypassing calibrated resistances 24, connected in series through limiting resistance 25 to stabilizer 26. Electrical output signal circuit 27, indicator 28 and electrical threshold element 29 are connected to calibrated resistances 24.

The device works as follows.

When the conveyor 2 is in operation, the output signal from the linear load sensor 1 is proportional to the current performance of the conveyor at the installation site of sensor 1, since the power supply voltage of dynamometers 4 using the power supply unit 6 is supported by the corresponding speed of the conveyor belt 2 measured by the belt motion control conveyor belt The current performance signal — the output voltage of the dynamometers .4 — due to the effect of frequency converter 5, is presented in the form of a pulse frequency.

This signal enters the lag node 8, which can be made in the form of a sequential register o-triggered, for example, by trigger cells. When a sequence of pulses arrives at the register input from the sensor / running load, the frequency of which corresponds to the current performance of the conveyor at sensor 1, each pulse of this sequence is recorded in the first register cell and subsequently transferred to subsequent cells at a speed (frequency) corresponding to the frequency of the advancing pulses. received through the circuit 12 from the sensor 7 of the control of the movement of the conveyor belt, i.e., the rate of advance of the pulses through the cells of the register of the node 8 late Vani rock mass is proportional to the moving speed of the conveyor belt 2 Boom 3.

The inputs 9 and 10 of the reversing integrator 11 receive two sequences of pulses (directly from the sensor / running load and through the lag node 8), respectively proportional to the performance of the conveyor 2 at the input and output of the monitored section.

When performing a reversible integrator // in the form of two stepper motors 13

and 14, connected to chains 9 and 10 n kinematically connected through differential 15 to threshold element 16 and indicator 17, the rotation nodes of the shafts of electric motors 13 and 14, respectively, reflect the amount of rock mass that entered the controlled section and came off it, and the angle the rotation of the output shaft of the differential and the readings of the indicator 17 correspond to the differences of the indicated values, i.e. the amount of rock mass in the controlled area at a given time.

If the reversible integrator 11 and the delay unit 8 are made in the form of a sequential register 20, the state K1 22 of the latter corresponds to the distribution and weight of the rock mass on the controlled section of the conveyor 2. The register 20 cells, which at a given moment of time record information about the loading of the conveyor, are in state "1 (in the excited state), the corresponding n is opened. closed keys 23 and enter the appropriate number of steps of calibrated resistances

24, as a result of which the voltage on them, entering the electric output signal circuit 27, on the indicator 28 and the electric threshold element 29, is proportional to the weight quantity of the rock mass, creating

distributed load in a controlled area. When the specified voltage threshold of the threshold element 29 is exceeded, the latter outputs a signal to the alarm and protection circuit against overloading of the boom metalwork 3.

Subject invention

Claims (5)

1. A device to protect metal structures of boom spreaders, rotary excavators and other machines against overload, including a running load sensor, a sensor controlling movement of the conveyor belt and a threshold element built into the emergency stop circuit of the equipment, characterized in that, in order to prevent the excavator from shutting down for a short time local gains of gon-load, the output of the linear load sensor directly and through the lag node are connected to the inputs of the reverse integrator, to which is connected to the threshold element and the indicator. 2. The device according to claim 1, characterized in that the running load sensor is made with a frequency converter. 3. The device according to claim 1, characterized in that the delay node is made in the form of a serial register, the forward pulse circuit of which is connected to the sensor control tape movement. 4. The device according to claim 1, characterized in that the reversible integrator is kinematically connected by means of a differential with a threshold element and an indicator. 5. The device according to claim 1, wherein that the reversible integrator and the lag node are made in the form of a sequential register, the cells of which are connected to the keys that shunt the resistors, subsequently RTM i r-f-TJ GTA GR; ; i П I L I Lia | IJ iLlii Ш j 4 ± Connected to a current regulator and connected to an electrical output circuit, an indicator, and a threshold element. . 9 loob YU (14Fig g 7j 1 1 D 71 D 1 :: gz-ll; ll 1 d; :: 1l s (l P-ZT11TG.LT. 25 - iDJjiaki3k k} kz3k H4i 24E 25® 25 FIG. 2