MXPA98000347A - Method and portable system to monitor the severity of the vibration of the pre - Google Patents

Abstract

The invention is directed to a portable device connectable to a mechanical press to measure the conditions of the press. The device includes signal processing circuits for processing a corresponding signal obtained from an accelerometer. The signal processing circuits have acceleration processing circuits for calculating a press acceleration signal, speed processing circuits for calculating a speed signal in the press, and displacement processing circuits for calculating a displacement signal of the press. The display circuits are used to display at least one of the calculated signals. A multi-contact switch connects the acceleration, velocity and displacement processing circuits to each other allowing an operator to select one of the signals calculated to register it in the display circuits. A method of using the device is also described

Description

METHOD AND PORTABLE SYSTEM TO MONITOR THE SEVERITY OF THE VIBRATION OF THE PRESS BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates in general to the control of the vibration of the press, and more particularly, to a method for generating an indicator of the severity capacity by the vibration of the speed. and the loading of the press, to determine the long-term operational reliability of the press and the die during the production operation and with the apparatus that uses the information generated by the above method in monitoring the vibration severity of the press. 2. Description of the Related Art The traditional method for calculating the tonnage of a press die is mainly done by calculating the static load. A given material has a certain shear length of the material and raw material with a certain thickness. From this, you can calculate the tonnage of the die or the force needed to shear or form the part. The traditional size of the press is based on the shear load of the static die 11 as calculated using the equation; [shear length (in.1 [Thickness (in.)] [S. (lb / in2)] = Shear load (lb).

* Traditionally, this load (in addition to forming loads and static printing) has been considered the only significant load and, therefore, the dynamic peak load of the press. Generally, in machine plus 5 short, at speeds below 300 strokes per minute, the dynamic effects are not a major influence on the severity of the application of the die. However, as the speed of the press increases, there are other different dynamic influences that are present, so that are created additional press load in addition to the increase produced by the actual shear load above the traditional static calculated value. In many cases, these dynamic loads exceed their shear load as the dynamic peak load. In addition to the shear loads more As effective, additional impact forces are created as the speed increases, which also contributes to the vibration of the press structure. It has been discovered through experimentation, that as the speed of the press increases there magnifications of impact on static charges as well as several additional charges that occur and that are not present at lower press speeds. There are actually several different sources of the additional die charge parameters, which are not necessarily known by press operators, production managers or owners. At high speeds, although the capacity of the press is not exceeded, it requires more force to make the part, which in turn, creates a different set of more severe vibration conditions. At higher press speeds, in the structure of the press, the loads are applied much faster, they are released faster, and in general, a stronger shock wave is produced which disperses and dissipates through the structure of the press. the press. As the speed of the press increases, the speed of sliding at a given point above the lower dead center position increases, thereby increasing the impact forces of the blows on the raw material. This increased impact force is related to the square of the velocity. Therefore, the speed of the press is one of many factors that increases the vibration in the press. When running the press at very high speeds, a more severe vibration is transmitted through the press. A second factor that contributes to the vibration of the press is the length of the blow, which increases the forces of impact and the load in the press. A third factor is the contact distance of the die blows and the separation plate above the lower dead center. The more these components are in contact below the dead center, the greater the impact of speed and, therefore, the more severe the level of vibration.

Another factor related to the increase of the vibration of the press is the stored energy that is released during the production of the part. Deflections are presented in the structure of the press during the loading of the die. As the raw material fractures, which is known as rupture, the release of the stored deflection energy sends shock waves of vibration through the structure of the press. the stored energy released also has the ability to accelerate the sliding down, which can cause the punches of the die to penetrate the raw material more deeply. As the applied load increases, tension and deflection levels within the structure of the press also increase, resulting in an increase in the energy released and an increase in vibration. Still another factor that affects the structure of the press and the vibration is the use of flattening stations or blocks of detention. If these devices are used in the die, then additional loads and impact forces are presented. As the speed of the press increases, the press guard will close automatically, which will cause, if the stop blocks are used, the application of a higher load. The press protector closes automatically, as the press speed increases, due to the inertial forces developed.

Still another factor is the effect of thermal protector. Again, as the speed increases, there is a viscosity of oil shear inside the crankshaft of the press and other bearing clearances. The heat generated by the oil shear is conducted through the structure of the press and the conductive connections, causing the guard to close in a deeper dimensional way. Therefore, the dynamic effects described above, which occur during the operation of the press, increase the total vibration and load levels induced in the structure of the press, all these increase with the increase in the speed of the press. The amplifications in the tension of the vibrations, created by the increase of the dynamic load, can cause many problems to the structures of the press. Over time, cracks can develop in any part of the mold within the structure of the press or in its parts, if the increase of the long-term dynamic load is unknown or ignored. It has been reported the structural break and parts of the component such as coupling rods, crankshaft, crowns, slides and dynamic scales, and in all cases the severity of the vibration can be correlated by the information of the service failure in the field, to develop the specific critical levels of the severity of the vibrations that are measured in the structure of the press during production. In certain levels of severity of the vibrations that are defined, the levels of amplification of the tension will be presented, reason why problems of severity of the maintenance for the press are created. Therefore, the relative life of a press is determined by the cumulative effects of the severity levels of the vibrations experienced by this period of time. A press can withstand high levels of vibration without suffering major structural damage, if the duration of the period is relatively short. Also, the press will resist certain levels of low vibrations without presenting structural damage, regardless of the duration of the period. However, cumulative structural damage will occur when the press is run under amplified voltage conditions as a result of medium to high vibration levels over a period of time in which it is operated continuously or intermittently. The damage will not necessarily be evident in the early stages but will begin to appear over time. The vibration monitoring systems of the prior art required no load rnse levels to be determined with a periodic no-load check of the relative level of the various locations of specific components, to try to evaluate the deterioration progress of the component. What is needed in the technique is a portable device that measures the severity levels of the application of real vibrations, while actually producing, which allows the press operator, the engineer, the production manager and the owner to know the long-term responsible effects of running the press in any combination of detected speed and load, by monitoring the actual vibration severity level of the die application, by measuring the RMS speed of the press, with an accelerometer and compare the level of corresponding operative vibrations in the letter of the area of the severity of the vibrations. SUMMARY OF THE INVENTION Generally, the present invention provides a method and apparatus for the identification of the severity capacity of vibrations by velocity and dynamic load, and for the determination of the reliability of the operation, in the long term, of the Die and press during the productive operation to die a given design. More specifically, the process of the present invention measures the vibration severity levels of the actual die applications, and electronically converts these measurements to identify the zones for operational reliability of the press generated by the use of an accelerometer sensor. The system reports the zones of vibration severity during the production operation. The zones that are established in this way, relate the level of severity of vibrations by RMS speed of the press, with the potential operative reliability in the long term for the press in particular as follows: Zone 1 Extreme long-term reliability Zone 2 Reliability very good long-term Zone 3 reliability (with caution); and Zone 4 is not advisable for long-term reliability. During the actual production operation of the press, the vibrations are monitored by RMS speed, processed and presented. A sensor, which is preferably an accelerometer, is placed in the location of the press. A calibrated electrical circuit converts the acceleration signal of the press to determine the press speed signal, the press shift signal or the RMS speed measurement within a frequency range of approximately 10 to 100 Hertz. The present invention warns the severity of the level of vibrations and the long-term reliability of the metal forming press for any application, which runs at any speed with any material. Vibration monitoring for preventive maintenance only controls changes without load at a base reference level of the specific components, achieved through the analysis of the reference level without load. The prior level of preventive maintenance vibration of the prior art that was measured under no-load conditions does not accurately reflect the actual conditions of the vibrations by production, as does the present system for monitoring the severity of vibrations. Therefore, for a long-term reliable production operation, the particular press must be operated within the zones of speed combinations and safe loads, which will cause the acceptable levels of the severity of the vibrations of the press. Each different design of the press will have certain dissipation characteristics of the inherent vibrations, which will allow to operate safely, with a long-term reliability, within the range of combinations of production speeds and dynamic load. Each press in particular can be monitored using an integral console monitor, or a plurality of presses, which can alternatively be monitored using a single portable measurement unit. A press is monitored during production using the following apparatus.

The invention comprises, in a form thereof, the inclusion of a device that is held by hand, attached to the mechanical press for media conditions of the press containing an accelerometer to measure the conditions of the press and create the signal corresponding and the mechanisms to process the signal that are held in the hand to process the corresponding signal. The mechanisms to process the signal are connected to the accelerometer to process the corresponding signal including the following branched circuits: the acceleration processors to calculate an acceleration signal of the press; mechanisms to process the speed to calculate the signal of the speed of the press; and the mechanisms to process the displacement to calculate the signal of the displacement of the press. The presentation mechanisms are used to indicate at least one of the calculated signals, with a switch connected to the mechanisms to process the acceleration, velocity and displacement together, thus allowing the operator to select the signals calculated to be indicated in the presentation mechanisms. The display mechanism comprises a mechanism to measure the voltage of the calculated signals and the voltage is digitally indicated as it represents a condition of the press. Additionally, the display mechanism includes a plurality of LED's arranged to illuminate a predefined, separate applied voltage range wherein an illuminated LED represents a particular range for an output of the signal to the display mechanisms. The range corresponds to a zone or range of vibration severity. The LED'S illuminates in different colors depending on the predefined voltage range. The invention comprises, in another form thereof, a method of monitoring the levels of the severity of vibrations in a press comprising the steps of providing a monitoring device, which is held in the hand, that visually indicates the levels of severity of the vibrations of the press in the zone of clear form, joining the sensor of the press to the press and connecting the sensor of the press to the monitoring device. The press runs and the level of the severity of the vibrations is determined based on the clear visual indicator of the area in the monitoring device. The invention comprises, in another form thereof, including a device that is attached to the hand, attached to the mechanical press to measure the corresponding signal of the accelerometer. The processor mechanism of the signal that is held by hand to process the corresponding signal is included in the device, the signal processor mechanisms are in communication with the accelerometer to process the corresponding signal. The signal processing mechanism comprises at least two of the following processor mechanisms: an acceleration processor mechanism for calculating the press acceleration signal; the speed-processing mechanism to calculate the signal of the speed of the press; and the displacement processor mechanisms to calculate the press shift signal. The signal processing mechanism also includes a presentation mechanism to indicate at least one of the calculated signals and a switch that connects the two processing mechanisms together and allows the operator to select one of the signals calculated for input into the mechanism of presentation. An advantage of the present invention in relation to the prior art is that it allows the press owner to predict instantaneously and determine the effects of long-term reliability of the vibrations that are created during the dynamic operation under different operating conditions such as They are speed and dynamic loading. Another advantage of the present invention is that the device is held by hand and is portable, so that field personnel can be able to verify press operations easily and efficiently. Additionally, the system allows the production or field personnel to control a number of different presses in rapid succession, even if they are presses with which the personnel is not familiar. Another advantage is that there is no need for an establishment to obtain an accurate reading of the severity of the vibrations. Field staff simply attach the accelerometer to the bed portion of the press or slide, turn on the unit and read the selected indicator. Yet another additional advantage of the present invention is that the device is attached to the moving press. There is no need to stop the press to determine the levels of the severity of the vibrations. Another advantage of the present invention is that it contains signal processing circuits to monitor negative and positive peak values and converts its signal levels using only a square root converter (RMS) system to convert the signal to DC voltages. The indicator LED's may be used by non-technical personnel, and these LED's are connected to particular voltage levels to indicate the different vibration severity zones, as referred to above. The present invention solves many of the drawbacks of the prior art by instantaneously establishing the severity of the vibration of a mechanical press created by its current operation application. This information is then used to guide the user to better understand the risks that are created, and therefore operate the press more safely and under production conditions that promotes improved presses and more durability of the die. This information can also be used to guide the user in the selection of suitable new presses to plan applications in future productions.

BRIEF DESCRIPTION OF THE DRAWINGS These and other features and advantages of the invention, and the manner of achieving them, will become more apparent and the invention will be better understood by reference to the following description of the embodiment of the invention taken together with the drawings. Annexes, wherein: Figures IA and IB schematically show an embodiment of the filtering portion of the signal of the circuit of the present invention. Figures 2A and 2B schematically show a portion of the present invention indicating the positive and negative detector circuit together with the sections of the RMS to DC converter and with the indicators of the screen. Figure 3 is a front view of the device that is held in the hand of the present invention.

Figure 4 is a front view of an alternative embodiment of the device that is held in the hand of the present invention connected to a modem. The reference characters indicate the corresponding parts through different views. The exemplification set forth herein illustrates a preferred embodiment of the invention, in one form, and this exemplification does not constitute a limitation on the scope of the invention in any way. BRIEF DESCRIPTION OF THE INVENTION Now, referring to the drawings, Figures 1 to 3 show the vibration severity monitoring system 10 of the present invention. In a general overview, the system 10 comprises a conditioning mechanism of the signal for conditional and presenting a signal of the accelerometer 12. The signal obtained in this way (ie a signal corresponds to and is related to an operating condition of the press), it is amplified and conditioned in three separate ways to obtain signals that represent the displacement of the press, the speed of the press and the acceleration of the press. One of these selected signals is conditioned by a peak-to-peak detector together with the subcircuit converter of the RMS to DC voltage. This signal, now at a particular level of DC, is then presented by a voltmeter and is additionally presented in a bank of LED's designed to illuminate particular voltage levels, thus indicating a particular type of signal. When these LEDs are illuminated, they indicate that the area of vibration severity is actually being detected by the accelerometer 12. The operating energy for the system 10 is obtained from a battery or a battery pack operating at 5 volts, whose energy is conditioned to through the DC power regulators Maxim M773 / M743 (not shown) of a conventional design and use. These types of regulators are capable of developing +/- 15 volts and 24 volts of DC current. Other alternative energy sources could work in an equivalent way as for example the power of a transformer / AC adapter and the like. System 10 is small and portable, adapted for an operator to carry in one hand. Referring now particularly to the schematic diagrams IA and IB, the simple slide switch 14 is used to operate the system 10 and select its different modes of operation. Switch 14 is a three-position multiple selection switch. The operating modes are inoperative when the batteries are disconnected, when the power is turned off or when the battery voltage is low. The power supply (not shown) includes the regulator circuits and the voltage control circuits, which are of conventional design to provide the output voltages of the electrical power to the operating system 10. The power source, which is shown as the line 16, operates at 24 volts. A constant current diode 18 provides the energy to the accelerometer 12. The system 10 begins with the creation of the input signal, formed by the accelerometer 12. The accelerometer 12 is connected or attached to the bed or slide of the mechanical press (not it shows) . During the operation of the press, the acceleration of the same causes an output signal that is general by the accelerometer 12. This output signal enters the system 10 through the test conductor or jump cable 13 to the junction point 90. To start the operation of monitoring, it is not necessary to stop the operation of the press, but in this case the connection or union of the accelerometer 12 is made in a portion of the press that does not turn or does not move, such as for example the bed of the press . The first function block of the signal processor subsystem is that of a second order high pass filter 20 comprising an Operational Amplifier (OP AMP) 22. Most of the OP AMP used in the system 10 are of the operational amplifier type. LF347N, available from National Semiconductor Inc. The output of the second high pass filter of order 20 is applied to the junction point 24. In this application, the term high pass filter is defined to mean an electric filter that attenuates the frequencies below. of a given frequency. Similarly, the term low pass filter is used to define an electric filter that attenuates frequencies above the given frequency. The positive and negative 15 volts of the power regulator (not shown) are used to drive the OP AMP of this invention. This second order, the indicated high pass filter 20 associated with the resistors and capacitors has a gain of approximately 0.0 Db at an approximate frequency of 1.0 Hz. A majority of the particular values of the resistor and the capacitor are not shown as they are easily determines from the OP AMP specification used and the basic engineering design books. The particular points that are not easily determined are the frequency, the gain and the order of the bandpass filters used. At the junction point 24 the developed and conditioned signal of the second high pass filter of order 20 passes along the line 26 representing the acceleration of the press being monitored. This signal passes through the first high-pass filter of order 28, using an OP AMP 30 of the same type as discussed above. This high-pass filter has an approximate gain of 0.5 dB at an approximate frequency of 1.0 Hz. The signal received by the first high-pass filter of order 28 via the line 26 is conditioned in this way and passes along the output line 32 towards a contact of the switch 14. Starting again from the point of attachment 24 , the mechanism of the integration of the speed of system 10 will be discussed. This subcircuit starts with an OP AMP of the type discussed above, established by a connection of resistors and capacitors to create an integrated with a gain of approximately 1.3 dB at an approximate frequency of 0.7 HZ. This conditioned signal passes through two capacitors 36 arranged in parallel. Then the signal passes through the first high pass filter of order 38 comprising the OP AMP 40 of the tipc discussed above. This first high pass filter of order 38 has a gain of approximately 1.0 dB at a frequency of approximately 1.0 Hz. The output signal of the first high-pass filter of order 38 passes along the line 42 to the junction point 44. Continuing with the analysis of the branching circuit of the velocity integration, the signal arriving from the junction 44 is applied to a second high pass filter order 46 comprising an OP AMP 48, of the type mentioned above. The particular arrangement of the capacitors and resistors with the second high-pass filter of order 46, creates the necessary criteria to form a filter with a gain of approximately 0.0 Db at a frequency of approximately 30.0 Hz. This eliminates the effects of the movement of the unbalanced press, created by inertia, interfere and take into consideration during the measurement of speed. This output of the second high-pass filter of order 46 is then applied to an input in the first high-order filter of order 50, which comprises an OP AMP 52, of the type mentioned above. The positive polarity of the OP AMP pin 52 is provided with a resistor 54 connected to a potentiometer 56 having two ends 58 and 60, one of which has a negative potential of 15 volts and the other negative 15 volts. Potentiometer 56 allows the circuit to be zeroed during calibration. The first high-pass filter of order 50 has a gain of approximately 1.4 dB at an approximate frequency of 30.0 Hz. This output signal conditioned by the previous sets of OP AMP then exits through line 62 to a switch contact 14 The signal arriving at the switch 14 through the line 62 represents the signal of the speed of the measurement of the press with an accelerometer 12. The mechanism of integration of the displacement of the system 10 is shown as the circuit of the third branch 64 which branches out of the branch circuit of the velocity integrator 38 at the junction point 44. The line 66 attached to the junction point 44 is the entry line to the displacement subcircuit 64. The displacement subcircuit of the Press 64 includes three OP AMP 68, 70 and 72 arranged in series, each having its own associated resistors and capacitors in a standard configuration. Each of the OP AMP 68, 70 and 72 are from the same OP AMP Quad 1F347N that was described above. The OP AMP is formed in a second order high pass filter with a gain of approximately 0.0 Db at a frequency of about 0.7 Hz. The output of the OP AMP is applied as an input to the shift integrator 76. This displacement integrator 76 uses OP AMP which has an approximate gain of 0.7 dB at a frequency of about 0. "Hz. The output of this shift integrator 76 it is then applied as an input to the first high pass filter of order 78 using the OP AMP 72. This filter has a gain of approximately 0.8 dB at a cutoff frequency of approximately 3.0 Hz. The output of this subcircuit 64 comprises OP AMP 68 , 70 and 72 through line 80 is applied to the contact of switch 14. This signal represents the offset value for the press that is monitored by the accelerometer 12. Depending on the signal that the user selects by means of switch 14, both the acceleration of line 32, the speed of line 62 or the displacement of line 80 are applied through switch 14 along line 82 to the second filter of p low order 84 that includes OP AMP 86, of the type discussed above. This filter has a gain of approximately 0.0 Db at an approximate frequency of 1.0 Kilohertz. The output of this second low pass filter of order 84 passes along line 88 to the detector and subsections of the system indicator 10 as shown in Figures 2A and 2B. Before discussing about the sub-circuits of the detector, it is important to note that the system 10 has additional circuits to indicate a short or open circuit of the accelerometer 12. From the junction point 90, which is indicated in Figure IA, the The signal level passes through both the open circuit detector 92 and the short circuit detector 94. Each of these sensors 92 and 94 utilizes a portion of the quad comparator IC LM339N. The signal arriving from the junction point 90 can indicate an open circuit when compared to the input power of 24 volts and a short circuit when compared to approximately 3 volts. If the comparator IC 96 detects an open circuit, it will illuminate the LED 98. If the comparator IC 66 detects a short circuit, it will illuminate the LED 100. Referring now to FIGS. 2A and 2B, the processor mechanism of the portion of the detector will be described. detector 101. As the conditioned signal passes from the filter subcircuits through the line 88, the signal enters the branched circuits 102, 104 and 106. Both branch circuits of the negative peak detector and the positive peak detector 102 and 104, respectively , use the OP AMP LF347N Quad that was described above. The branch circuit of the peak detector 102 includes two OP AMP 108 and 110 connected in series by a diode 112 in the indicated direction (FIG. 2A). The output from the positive peak detector 102 is applied to the line 114. The subcircuit 102 detects the positive peak of the substantially sinusoidal signal conducted through the line 88. Similarly, the branch circuit sensing the negative peak includes two OPs AMP 114 and 116 connected in series by diode 118 in the indicated direction. Subcircuit 104 detects the negative peak of the substantially sinusoidal signal conducted through line 88. A reset switch 120 connects the diode 112 and OP AMP 110 junctions, and diode 118 and OP AMP 116.

This reset switch indicates zero in both the branch circuit of the positive and negative peak protector 102 and 104. The output signal of the negative peak detector 104 is conducted along the line 122 to the OP AMP 124. The OP AMP 124 calculates the absolute value of the difference between the branched circuits of the positive and negative peak detector. This absolute difference is referred to as peak to peak. When the switch 14 is selected in the displacement, OP AMP 124 determines the peak-to-peak displacement of the measured press vibrations and outputs the corresponding signal. When the switch is selected in acceleration, OP AMP 124 determines the peak-to-peak acceleration of the measured press vibrations and outputs corresponding signal. The output of this device is then applied through line 126 to two contacts 128 and 130 of switch 14. Figure 2B shows contact 128 of switch 14 which supplies the peak-to-peak acceleration signal and contact 130 provides the peak to peak displacement signal. Again we will refer to the branch circuit detector of the positive peak of Figure 2A, of line 114, an overload de-ector of the circuit 131, uses a buyer LM339N) N quad 132. If an envelope signal is presented charging on line 114, detector 131 will cause LED indicator 134 to illuminate. Depending on the type of accelerometer 12 used and the OP AMP selection used, the critical value of the circuit load will vary. Figure 2A shows another detector that is used within the system 10. A low-battery detector 136 uses a LM339N quad 140 comparator, through the selection of a particular input and determined resistance values whether or not the source of energy, ie the battery, is below the critical value. The LED of the low battery 138 illuminates when the power source, ie the battery, is outside the particular voltage range. The last branch of the detector sub-section within the system 10 is the single RMS for directing the current converter 106. The branch circuit 106 includes a plurality of OP AMP 142, 144 and 144 arranged in series, all types of these were mentioned previously. When the switch 14 is selected in vibrations, this branched circuit determines the RMS vibration of the measured press and outputs the corresponding signal. As shown in Figure 2A, the polarity of the entire wave of the diodes 148 rectifies the signal that enters from the line 88, converting the signal that varies at a particular DC voltage level.

This level of DC voltage is supplied to the OP AMP through various resistor and capacitor values that average this level over time, and calculate the RMS equivalent (Main Square Root) of the press vibration as the accelerometer 12 perceive The issue of OP AMP 142, 144 and 146 provides a single RMS for DC conversion and supplies the same on line 150. Referring to Figure 2B, this single RMS signal passes along line 150 to indicate zero in OP AMP 152 of the type which was mentioned above. The variable of potentiometer 154 allows to indicate zero in the circuit during the calibration. The output from this zero state passes along the line 154 that supplies this single RMS signal calibrated for both the LED bank 156 and the contact 158 of the switch 14. The LED bank 156 includes, in this embodiment , four LEDS, 160, 162, 164 and 165 corresponding to the four zones of the level of vibration severity as described in the background of this application and U.S. Patent No. 5,094,107 assigned to the attorney of the present invention , whose specification is explained herein as a reference. As indicated in Figure 3, the vibration severity zones from 1 to 4 are represented by the illumination of the respective LED 160, 162, 164 or 166. Depending on the single RMS signal applied through the the line 154, the fourth comparator IC 168, a comparator IC LM339N quad, each of the LEDs 160-166 driven, respectively. Based on the values of the particular resistor 170 in series and having a positive 15 volt level applied to the connection point 172, each LED will illuminate as the applied voltage from 154 exceeds the criteria of each comparator 168 as programmed by these resistor values. Each of the LEDs 160, 162, 164 and 166 is used to represent the four levels of the vibration severity zones, as shown in Figure 3. In addition, the LEDS 160-166 has a color code as It is indicated in the following table. LED Color Severe Vibration Zone 160 Green Zone 1 - Extreme long-term reliability, below .18 In / sec vibrations RMS 162 Green Zone 2 - Very good long-term reliability, from .18 In / sec up to .44 ins / sec Vibrations RMS 164 Yellow Zone 3 - Reliability (caution zone) from .18 In / sec up to .44 ins / sec vibrations RMS 166 Red Zone 4 - Not recommended for long-term reliability; above .53 In / sec RMS vibrations The LCD 180 display unit is a numeric display using an included voltmeter as the available type of Crompton Modutec, part number BL102- 302. This LCD 180 numeric display has the signal directed towards this both from line 126 and from line 154, and this signal is presented on the face plate of device 182. The calibration is carried out separately for acceleration, velocity and displacement. A signal of known amplitude and frequency is input to the input of the transducer 12. The potentiometers are then adjusted until the correct reading is presented on the LCD screen. The high pass filters 28, 50 and 78 include the gain variables to calibrate the acceleration, velocity and displacement respectively. The values of the input and output signal presented are functions of the selected resistance and capacitance values throughout the circuit, so the calibration is simple in these valves that have been selected. Additionally, the connection of the device 10 may include a remote transmission device such as a modem 190 (Figure 4) for sending the information of the severity of the vibrations computed to the central station or the remote data storage center. The device 10 is connected to the modem 190 by means of the line 192. In this case, the device 10 will send by means of the modem 190 or other means, for example a communicator without wires, Internet, telephone system, local area network , Global network, measured acceleration or computed speed, acceleration or displacement of the press to a distant digital storage unit. The known methods are used to send values of the digital signal by means of the remote transmission device. While this invention was described as having a preferred design, further modifications to the present invention can be made, provided they are within the spirit and scope of the presentation. Thus, this application is intended to cover any variation, uses or adaptations of the invention using its general principles. Furthermore, this application is intended to cover these deviations from the present description if they form part of the practice known and used in the art to which the invention pertains and which falls within the limits of the appended claims.

Claims (10)

1. Claims 1. A hand-held device, which can be attached to a mechanical press to measure the conditions of the press, this device comprises: an accelerometer to measure the conditions of the press and create a corresponding signal; a processor mechanism of the signal, which is held by hand, to process the corresponding signal, the mechanism processor of the signal is connected to the accelerometer to process the corresponding signal, the mechanism signal processor comprises: the mechanism acceleration processor to calculate the acceleration signal of the press; the speed processor mechanisms to calculate the press speed signal; the displacement processor mechanism for calculating the press shift signal; the mechanism of the screen to display at least one of the calculated signals; and the switch that connects the processors of acceleration, velocity and displacement together and allows an operator to select one of the signals calculated to be indicated on the mechanism of the screen.
2. 2. The device according to claim 1, wherein the mechanism of the screen comprises the mechanism for measuring the voltage of the calculated signals and indicates this voltage representing a condition of the press.
3. The device according to claim 1, wherein the display mechanism includes a plurality of LEDs arranged to illuminate at ranges of applied, predefined, separated voltage, wherein the illuminated LED represents a particular range for an input signal. to the mechanism of the screen.
4. 4. The device according to claim 3, wherein the LED is illuminated in different colors depending on the predetermined voltage range that is applied.
5. The device according to claim 1, wherein the acceleration processor mechanism includes a first order filter.
6. The device according to claim 1, wherein the speed-processing mechanism comprises a signal integrator, a first high-pass filter, ordering, a second high-pass filter, ordering and a first filter of high order step in series.
7. 7. The device according to claim 1, wherein the displacement processor mechanism comprises a signal integrator, a first high-pass filter, order, a second high-pass filter, order, a second integrator of the signal, and a first high pass filter of order in series.
8. The device according to claim 1 wherein the signal processing mechanism includes a second low pass filter of order that reduces the high frequency signals applied to the display mechanism.
9. The device according to claim 1 wherein the speed processing mechanism includes a high pass filter having a frequency band above about 30 hertz, wherein the lower frequency signals are removed to avoid the measurement of the effects of inertia in the press.
10. 10. The method for monitoring the severity levels of vibrations in a press comprising: providing a portable monitoring device, which visually indicates the severity levels of vibrations in the press, in clearly defined areas; join the sensor of the press to the press; connect the sensor of the press to the monitoring device; operate the press; and determine the level of severity of the vibrations based on the visual indicator of the area that is clearly indicated on the monitoring device.