Alarm sensor

FIELD: alarm sensors for use in underground mines.

SUBSTANCE: sensor contains piezoelectric generator of sound signal with two input contacts for feeding powering voltage of certain frequency and circuit assembly, connected to power source for generation of powering voltage. Piezo-electric generator of sound signal has additional output contact, which, when powering voltage is fed onto sound signal generator from circuit assembly, generates response voltage signal, which is a value appropriate for force of sound created by alarm sensor.

EFFECT: creation of sensor which may be used at resonance frequency, therefore, at maximally possible loudness of sound signal, and which makes it possible to transfer confirmation signal about successful output of sound alarm to control system of portable collapsible lining frame.

12 cl, 3 dwg

 

The invention relates to a sensor alarm, particularly for use in underground mines, with the piezoelectric element in the formation of a sound signal with two input terminals for application of a voltage of a certain frequency and with a circuit arrangement for generating the supply voltage connected to the power source.

Used in underground mine workings portable collapsible frames lining during excavation of the extracted raw materials, such as coal, regular way, knock, move in the direction of the front generation and then re-install. When implementing this process, it is important that the miners were not in the danger zone, so taken various measures to ensure security in order not to cause anyone harm during wybicki, move, and install one or more portable collapsible frames lining.

One of these security tools, which are distributed over the floating collapsible frame supports and connected with the control system penetration and provides it in action, are the sensors alarms, which are activated with the beginning of wybicki and produce long enough and loud warning tone that immediately before p is acessem wybone to notify the miners, located near the floating collapsible frame supports, of impending as a result of this danger.

Known sensors alarms, which are used for the above purpose, have a piezoelectric element (siren) for generating a sound signal with two terminals, which provides the supply voltage, the supply voltage has a frequency that corresponds to the frequency generated by the buzzer beeps. Since the use of such a sensor warning alarm shall be generated if possible, a loud warning signal, we strive to bring the frequency of the supply voltage in accordance with the resonant frequency of the element generating a sound signal in its assembled condition, as in a resonant mode attainable volume sensor warning alarm is possible.

The goal, which is to known sensors alarms to use at the resonant frequency, was in practice difficult to achieve. Because not only that all the piezoelectric shapers sound signal at its resonant frequency, differ to some extent from each other, but also that the resonant frequency of the driver beeps mounted in the om condition also depend on the installation conditions, for example from the tightening torque of the screw fasteners and the like, as well as the fact that the surrounding area sensor warning alarm has on the resonant frequency of the impact cannot be underestimated, the volume of which is known sensors alarms produce your warning tone, generally less than would be possible in theory. Another disadvantage of the known sensor warning alarm is that the management system construction of the floating collapsible frame lining has no ability to determine whether the siren was developed warning tone.

The objective of the invention is to create a sensor warning alarm aforementioned type, which can be used at the resonant frequency, therefore, the maximum possible volume of a sound signal, and which provides the possibility of transferring the control system of the portable collapsible frame supports signal confirmation about the successful issuance of a warning beep.

In accordance with the invention this task is solved in that the piezoelectric driver audio signal is output pin, which is fed to the driver the sound of the first signal voltage is produced in response to the voltage signal, supplied to the circuit arrangement and which is the value corresponding to the volume of the audio signal (the power of sound) sensor warning alarm.

Using a third contact provided in the imaging unit beeps, you can generate the actual (nominal) signal, with which you can easily calibrate the circuit layout so that generated by the supply voltage had a frequency that matches the resonant frequency of the sensor warning alarm. The invention profitably uses that are applied to output pin feedback voltage, which is induced due to the vibrational motion of the piezoelectric driver audio signal and which accordingly has a frequency corresponding to the oscillation frequency of the piezoelectric element and, consequently, the frequency of the supply voltage, will take the maximum value of the voltage, if the siren is driven in the resonance region. To calibrate the sensor alarms, thus, it is necessary only to vary the frequency of the supply voltage and to simultaneously control the response signal voltage and to set the frequency of the supply voltage to a value at which the voltage provided by the response signal is the maximum. This measurement and calibration can be carried out simply. The response voltage signal is produced in any case, when the piezo really fluctuates and thereby generates a warning signal; the absence of a response signal thereby indicates sensor warning alarm has not developed provided a warning signal, and the command to move a portable collapsible frame lining is thrown.

Especially preferred if the circuit arrangement has a device for automatically calibrating frequency of the supply voltage; thus, the circuit arrangement determines the frequency at which the output signal of the voltage maximum. Such automatic calibration can be performed by comparative measurements, and proved to be particularly expedient to carry out the automatic calibration on the principle of successive approximation. This way of working memory required buffer storage device measurements will be relatively little loaded, and sold fast and very accurate calibration.

The scheme may have a frequency generator for generating and changing the frequency of the supply voltage. Driver audio signals is preferably in the cylindrical housing with the Reny and fixed by a locking element, which can represent, for example, a screw insertion. You can also use as a retainer-ring or snap ring. Installation of driver audio signals in the case of the siren with a locking element is provided and in serial production quickly and reliably.

Driver audio signal preferably has a carrier plate located on it the piezoelectric membrane respectively placed on her back reading output is connected to output pin.

Reverse reads the output varies with the piezoelectric membrane, when it is fed a supply voltage of a certain frequency. Due to their fluctuations by using the inverse of the read output to the output contact is formed by a voltage whose frequency corresponds to the frequency fluctuations of the membrane, and which changes its value with the change in the amplitude of the membrane and, consequently, the volume of the siren.

Circuit layout may have an electronic control device in the form of a microcontroller, which has outputs for signal supply voltage and input for the supply voltage and to the response signal. The circuit arrangement may further be included between the electronic control device and output to the tact rectifier device, which straightens the response voltage signal so that it can be easily processed in the electronic control device. The signal voltage with electronic controls can be enhanced by using schemes to strengthen before they are fed to the inputs-outputs, so that itself is an electronic means of regulation were of low power consumption.

Driver audio signal and the circuit layout can be in a common housing siren, which then, after its installation in the space provided in the floating collapsible frame lining or other similar tool should be connected to the power source and contact to activate the siren.

Other distinctive features and advantages of the invention are explained in the subsequent description with reference to the drawings illustrating the preferred embodiment of the invention, which shows the following:

Fig. 1 is a view in longitudinal section of the sensor warning alarm corresponding to the present invention in assembled condition;

Figure 2 - schematic representation of the piezoelectric driver audio signal intended for use in sensor warning alarm corresponding to the invention, and its associated circuit layout; and

Figure 3 - functional is I'm a schematic circuit layout for sensor warning alarm corresponding to the invention.

Figure 1 shows the sensor warning alarm system 10 used in a floating collapsible frames lining (not shown) in an underground mine workings, is intended to alert the miners before the process wybicki, move and re-install the framework supports sound signal maximum volume.

Sensor warning alarm system 10, which is depicted in figure 1 in assembled condition in the wall 11 of the casing, consists of a piezoelectric driver 12 of the audio signal and the associated connecting cable 13 circuit layout 14, and the circuit arrangement 14 and the imaging unit 12 of the sound signal are located in a common housing 15 siren.

Case 15 siren made of plastic and has the shape of a bowl or Cup. On the outer circumference, it is equipped with a screw thread 16, by which it is screwed into an appropriate mounting hole in the wall 11 of the housing. The front flange 17 in the housing siren limits the depth of insertion into the receiving hole and provides a certain position of the device in the wall 11 of the housing.

On its front side 18 of the housing siren is closed the circuit Board 20, equipped with sound channels 19. On the inner side of the plate 20 is a thin spacer (intermediate) ring 21 of tiny, for example, a ring to which is attached the imaging unit 12 of the sound signal. To fix driver audio signal into its prescribed position is provided by a screw insert 22, a screw from the back side into the housing 15 of the siren; and the imaging unit 12 of the sound signal is clamped between the front end 23 of the screw and insert the spacer ring 21.

Circuit arrangement 14 is fully seated on the circular plate 22, which is inserted into the rear cylindrical recess 25 in the screw the insert 22 and secured therein by means of curable casting compound 26.

The piezoelectric driver 12 of the audio signal and the circuit arrangement 14 is schematically depicted in figure 2 in the horizontal projection. The imaging unit 12 of the sound signal consists of a circular carrier plate 27 made of brass, on which is placed a piezoelectric membrane 28. Support plate 27 and the diaphragm 28 must have the appropriate input pins 29 and 30, through which the imaging unit 12 of the sound signal through the wires 31, 32 supply voltage is supplied from the circuit layout 14. The piezoelectric membrane 28 is supplied on the reverse of the read output 33 with the output contact 34, which is connected by a wire 35 with the circuit layout.

Functional diagram of the device shown in figure 2, the schema is partially presented in Figure 3.

Circuit arrangement 14 has as a Central component of an electronic tool 36 regulation in the form of a microcontroller, which is included between the regulator 37 voltage for the supply voltage and the two operational amplifiers 38, through which the output signal of the electronic control devices is amplified and fed as a supply voltage through the wires 31, 32 input contacts 29, 30 in the imaging unit 12 of the sound signal.

Between the output contact 34 and the microcontroller 36 is provided by a rectifier circuit 39, which rectifies the output signal of the voltage supplied to the output contact 34 when the siren, and in this processed form submits it as a valid value to the microcontroller.

The principle of operation of the siren is described below.

On the imaging unit 12 of the sound signal through its input pins 29, 30 supply voltage from the microcontroller supplied input voltage, after amplification in the operational amplifier 38 having a frequency which is before the first calibration siren under certain circumstances may differ significantly from the resonant frequency. The piezoelectric membrane 28 is provided in the fluctuations of supply voltage and its frequency corresponds to the frequency of the supply voltage. Also together with the membrane the ranges of the inverse of the read output 33 with the same frequency of the supply voltage. Thus it generates the output pin 34, a feedback signal voltage, which has the same frequency as the frequency of the supply voltage, and the amplitude of the response signal characterizes the strength of the sound of the siren and accordingly reaches the maximum value in the case where the horn is driven at its resonance frequency at which it has maximum volume.

This feedback voltage is rectified in the rectifier circuit 39, and then is fed to the microcontroller 36. It represents the first confirmation that the siren was indeed powered, thus were warned miners located in the vicinity of a floating collapsible frame supports before was his wybone, move, and reinstall. The response voltage signal can also be used for the calibration of the siren, and the calibration process can be initiated in a preferred embodiment of a microcontroller with regular time intervals set in advance, or manually.

For calibration, the purpose of which is to set the supply voltage on input pins 29, 30 at the resonant frequency of the sensor warning alarm siren is used on the principle of successive approximation, with Pete the relevant voltages of different frequencies, and for each frequency, supply voltage determines the magnitude of the response signal. Thus, the microcontroller generates a first supply voltage with a certain initial frequency f1 and determines a corresponding response signal A1. Then to develop a sound signal with higher and lower frequencies. Thus, testing is performed in a systematic way relative to the initial value and subsequent measurement is determined whether the response signal to a higher value. If this occurs, run the following measurements around this new center value, and the magnitude of the steps of the individual measurements is constantly decreasing. Thus, the microcontroller automatically configures the frequency of the supply voltage to a value at which the response signal is the largest. This value, which essentially corresponds to an instantaneous resonance frequency of the sensor warning alarm, after the calibration process is stored in the microcontroller and is used until the next calibration, as-specified value for the frequency of the supply voltage.

Using siren corresponding to the present invention, is achieved at a relatively low applied voltage of 12 V and a low current consumption, C is uchitelya the power of the sound of the siren of the order of 95 dB, as the sensor warning alarm is used particularly simple and accurate way in the field of its resonant frequency at which it has maximum volume. Due to the response signal of the voltage control system moving the collapsible frame supports always receives confirmation that the audible siren sound is actually produced, prior to initiating the process of wybone with step-by-step movement. Thus, the new sensor warning alarm significantly increases the safety of miners working in underground workings.

1. Sensor alarms, primarily for use in underground mines, with the piezoelectric driver audio signal with two input terminals for the supply voltage of a certain frequency and with a circuit arrangement connected to a power source to generate the supply voltage, wherein the piezoelectric driver audio signal (12) has an additional output pin (34), which is fed to the driver of the sound signal (12) of the supply voltage from the circuit layout (14) produces a feedback signal voltage, which is a value corresponding to a force sensor sound alarm (10).

2. Sensor pre is proactive alarm system according to claim 1, characterized in that the circuit arrangement (14) is the automatic calibration frequency of the supply voltage.

3. Sensor warning alarm according to claim 2, characterized in that the automatic calibration is activated after a certain time.

4. Sensor warning alarm according to claim 2, characterized in that the automatic calibration is activated by an external signal.

5. Sensor alarms according to any one of claims 1 to 4, characterized in that the circuit arrangement (14) has a frequency generator (36) for generating and changing the frequency of the supply voltage.

6. Sensor alarms according to any one of claims 1 to 5, characterized in that the driver of the sound signal (12) is preferably in the cylindrical housing siren (15) and fixed by a locking element (22).

7. Sensor warning alarm according to claim 4, characterized in that the locking element (22) consists of a screw insert, ring, spring retaining ring or other similar means.

8. Sensor alarms according to any one of claims 1 to 7, characterized in that the driver of the sound signal (12) has a bearing element (27) to host the piezoelectric membrane (28), where the inverse considered yuushi conclusion (33), which is connected to the output pin (34).

9. Sensor alarms according to any one of claims 1 to 8, characterized in that the circuit arrangement (14) has an electronic control device (36) in the form of a microcontroller, which has outputs for signals supply voltage and input for the supply voltage, as well as for the response.

10. Sensor warning alarm system according to claim 9, characterized in that the circuit arrangement (14) has a rectifier circuit (39), included between the electronic control device (36) and the output pin.

11. Sensor alarms according to any one of claims 1 to 10, characterized in that the signal voltage with the electronic control devices before they are fed to the inputs and outputs are amplified by circuits gain (38).

12. Sensor alarms according to any one of claims 1 to 11, characterized in that the driver of the sound signal (12) and circuit arrangement (14) housed in a common housing siren.



 

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