JP3296770B2 - Vibration severity monitoring system and method for portable press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to press vibration monitoring, and more particularly to a press load / speed vibration severity tolerance index for determining press / die reliability during long term operation during production operation. And a device utilizing information generated in monitoring the severity of press vibration by the above method.

[0002]

2. Description of the Related Art A conventional method for calculating the total tonnage of a press die is mainly based on a static load calculation method. A given die has a constant material shear length and a constant thickness of raw material. From this, the total tonnage of the die or the force required to shear or form the part can be calculated. Conventional press sizing involves the equation [shear length (inches)] [thickness (inches)] [S. (Lbs / inch2)] = Based on "static" die shear load as calculated using pounds of shear.

Conventionally, this load (the sum of the forming and punching static loads) has been regarded as the only significant load, and therefore the peak dynamic load of the press. Generally, the speed is 30 minutes per minute
For short machines below zero stroke, the dynamic effects do not significantly affect the severity of die use. However, as the pressing speed increases, several other dynamic effects appear, which result in additional press loads in addition to the increase caused by the actual shear load over conventional static calculations. In many cases, these dynamic loads will be greater than the shear loads as peak dynamic loads. In addition to higher effective shear loads, additional impact forces occur as the press speed increases, which further affects the vibration of the press mechanism.

[0004] Experience has shown that as the press speed increases, some additional loads that do not exist at low speeds appear with the increase in impact force against static loads. In practice, there are several different causes for additional die load parameters that many press operators, production managers or owners do not necessarily need to know about their existence. At high speeds, even if the capacity of the press is not exceeded, the press requires more force to produce the part, which in turn creates another more severe vibration condition.

[0005] At higher press speeds, as the load is more rapidly applied and released within the press structure, a much stronger shock wave is generally created, which is dissipated through the press structure. The increase in press speed increases the slide speed at any given point on the bottom dead center position, thereby increasing the punch impact on the raw material. These impact increases are related to the square of the velocity. Thus, press speed is one of several factors that increase press vibration. Due to the press operation at high speed, more intense vibrations are transmitted through the press.

The second factor affecting press vibration is the stroke length which increases the impact force and load on the press. The third factor is the contact distance between the die punch and the stripper plate at the bottom dead center. The higher these elements make contact on the bottom dead center, the greater the impact velocity and, therefore, the more severe the vibration level.

Another factor associated with increased press vibration is the stored energy released during part manufacturing. The deflection of the press structure occurs during loading of the die. Raw materials are snap
The release of the stored deflection energy when punctured, referred to as through, sends an oscillating shock wave through the press structure. The released stored energy also has the ability to accelerate the slide downward, which allows the die punch to penetrate deeper into the raw material. As the applied load increases, the magnitude of stress and deflection in the press structure also increases, resulting in increased energy release and increased vibration.

[0008] Yet another factor affecting press structure and vibration is the use of flattening stations or stop blocks. When these elements are used in a die, extra loads and impacts appear. As the press speed increases, the press shut height naturally approaches, which results in higher loads when using stop blocks. The press shut height naturally approaches due to the developing inertial force as the press speed increases.

[0009] Yet another factor is the thermal shut height effect. Again, as the speed increases, viscous shearing of the lubricant occurs in the press crankshaft and other bearing gaps. Heat resulting from the shearing of the lubricating oil is conducted through the press structure and the drive connection, bringing the shut height closer in dimension.

Thus, the above-described dynamic effects that occur during press operation increase the loads and overall vibrations induced in the press structure, all of which increase with increasing press speed.

[0011] The increased vibrational stress caused by the increased dynamic load can cause a number of problems with the press structure. Ignoring or neglecting the increase in long-term dynamic loads, cracks can develop in the cast structure or castings throughout its components over time. Damage to structures and components such as connecting rods, crankshafts, crowns, slides and dynamic balances has been reported, and in all cases, the severity of vibrations has been reduced by the maintenance This could be correlated with the development of the above-defined clear threshold oscillation severity levels. At certain definable vibration severity levels, stress build-up levels will appear, thus creating a maintenance severity problem for the press.

The relative life of the press can thus be determined from the cumulative effects of the severity of vibration experienced during this period. If the duration is relatively short, the press can withstand high vibration levels without major structural damage. Also, the press can reliably withstand low vibration levels, whatever the duration, without causing structural damage.

However, when operating the press in an increased stress condition as a result of medium to high vibration severity levels for extended periods of time, whether continuous or intermittent,
Cumulative structural failure occurs. This damage, which is not always obvious at an early stage, begins to appear over time.

Prior art vibration monitoring systems need to determine the no-load response level by periodic unloading of the relative levels at several well-defined component locations in an attempt to assess the progress of component degradation. is there.

What is needed in the art is a portable device that measures the severity level of vibrations that are actually applied during actual production, thereby providing a press operator, tool technician, production manager, or owner. The operator was detected by monitoring the actual vibration severity level of the die use through measuring the press RMS speed using an accelerometer and comparing the corresponding driving vibration severity level with the vibration severity identification band chart. It is possible to know the long-term reliability effect of the press operation at any combination of speed and load.

[0016]

SUMMARY OF THE INVENTION The present invention relates to a press of a given design, which has a dynamic load /
It is an object of the present invention to provide a method and an apparatus for assessing the allowable amount of velocity vibration severity and for determining the long-term operation reliability of a press / die.

[0017]

SUMMARY OF THE INVENTION The present invention is a portable device mountable on a mechanical press for measuring a press condition, said device comprising: a device for measuring a press condition and generating a corresponding signal. An accelerometer and portable signal processing means connected to the accelerometer for processing the corresponding signal for processing the corresponding signal; the signal processing means comprising; an acceleration for calculating a press acceleration signal; Processing means;
Speed processing means for press speed signal calculation, displacement processing means for press displacement signal calculation, display means for displaying at least one of the calculation signals, acceleration processing means, speed processing means and displacement And a switch which is connected to the processing means and which can be selected by an operator to input one of the calculation signals to the display means.

[0018]

More specifically, the procedure of the present invention is based on the use of an accelerometer sensor to measure the vibration severity level of actual die use and to convert these measurements electronically. Identify the identification band related to press operation reliability. The system reports vibration severity identification bands during press production operations. The identification band thus determined is Press RM
The S-speed oscillation severity level is related to the potential long-term operational reliability for a particular press as follows.

Identification band 1: excellent long-term reliability; identification band 2: good long-term reliability; identification band 3: reliable (needs attention); identification band 4: long-term reliability cannot be obtained.

During the actual press production operation, the RMS speed vibration is monitored, processed and displayed. A sensor, which is preferably an accelerometer, is placed at one location on the press. The calibrated electronics converts the press acceleration signal to provide a press speed signal, press displacement signal or RMS speed measurement of about 10
To within the roll-off frequency range from 100 Hz to 100 Hz.

The present invention advises on the severity of vibration and the level of long-term reliability of metal forming presses operating at any speed and for any material in any application. The preceding preventive maintenance vibration monitoring only monitors the no-load variation of the specific element with respect to the basic reference level obtained through the no-load reference level analysis. Previous prior art preventive maintenance vibration levels measured under no load conditions do not accurately reflect actual production vibration conditions, as does the present vibration severity monitoring system.

Thus, for reliable long-term press production operations, a particular press must be operated within a safe load / speed dynamic combination identification zone where the severity of the press vibration is acceptable. . Each of the different press designs has constant natural vibration dissipation characteristics, which allows it to operate safely and with long-term reliability within one area of the combination of production speed and dynamic load.

Each single press may be monitored using an integrated console monitor, or alternatively, multiple presses may be monitored using a single portable measuring device. The press is monitored during production using the following equipment.

The present invention, in one form thereof, corresponds to a portable device that can be mounted on a mechanical press for measuring press conditions and includes an accelerometer for measuring press conditions and generating a corresponding signal. Portable signal processing means for processing signals. The signal processing means is connected to the accelerometer for processing the corresponding signal and includes the following branch circuit. That is, an acceleration processing unit for calculating a press acceleration signal, a speed processing unit for calculating a press speed signal, and a displacement processing unit for calculating a press displacement signal.

The display means is used to display at least one calculated signal, to which a switch connecting the means for processing acceleration, velocity and displacement is attached so that the driver can display one of the calculated signals. So that it can be selected as input.

The display means comprises means for measuring the voltage of the calculation signal and digitally displaying the voltage as a representation of the pressed state. In addition, the display means includes a plurality of LEDs arranged to illuminate in separate, predetermined applied voltage ranges, whereby the illuminated LEDs illuminate a particular area for signals input to the display means. It is meant to represent. This region corresponds to a particular vibration severity identification band or region. The LEDs glow in different colors according to a predetermined applied voltage range.

[0027] In another aspect, the invention provides a portable monitoring device that visually indicates the severity of vibration of the press in a manner that divides the severity of the vibration into identification bands; and mounting a press sensor on the press; Connecting the press sensor to a monitoring device. The press is activated and its vibration severity is determined based on the visual indicator of the identification band on the monitoring device.

[0028] In another aspect, the invention comprises a portable device mountable on a mechanical press for measuring a press condition from a corresponding signal of a press accelerometer. A portable signal processing means for processing the corresponding signal is included in the device, the signal processing means communicating with the accelerometer to process the corresponding signal. The signal processing means includes at least two of the following processing means. An acceleration processing unit for calculating a press acceleration signal, a speed processing unit for calculating a press speed, and a displacement processing unit for calculating a press displacement. The signal processing means further connects the means for displaying at least one of the calculated signals and the two processing means included so that the driver can select one of the calculated signals as an input to the display means. Switch.

An advantage of the present invention over the prior art is that the press owner can immediately determine the impact on the long term reliability of vibrations generated during dynamic operation under various operating conditions such as speed and dynamic load. That is, it can be predicted and determined.

Another advantage of the present invention is that the device is portable and portable, so that field personnel can easily and efficiently check press operation. In addition, the system allows production or field personnel to perform a number of different presses,
Even if it is a press that the site staff has never seen before, it will be possible to quickly inspect the press in sequence.

Another advantage is that virtually no settings are required to obtain an accurate reading of the severity of the vibration. Field personnel simply attach the accelerometer to the press base or slide,
All you have to do is turn on the device and read the selected display.

Yet another advantage of the present invention is that it can be mounted on a running press. There is no need to stop the press to determine the vibration severity level.

Another advantage of the present invention includes a signal processing circuit for monitoring positive and negative peak values and converting the signal level to a DC voltage using a unique root mean square (RMS) system converter. It is that you are. An LED indicator is utilized for use by non-technical personnel and is connected to a particular voltage level to indicate the various vibration severity identification bands referred to above.

The present invention overcomes many of the shortcomings of the prior art by determining almost immediately the vibration severity resulting from the current operating state of the mechanical press. This data is then used as a guide for the user to better understand the hazards that have arisen and thereby operate the press under production conditions that are more secure and promote improved press and die life.
This data is also used as a guide for the user to select a new press appropriate for the planned future application.

[0035]

The above and other features and advantages of the present invention,
The manner in which the invention is accomplished will be more apparent and the invention will be better understood with reference to the following description of an embodiment of the invention taken in conjunction with the accompanying drawings.

Corresponding reference characters indicate corresponding parts throughout the several views. The examples set forth herein illustrate one preferred embodiment of the invention in one form, and are not considered to limit the scope of the invention in any way.

Here, reference is made to FIGS. 1 to 5 showing the vibration severity monitoring system 10 of the present invention.

In general, the system 10 comprises signal conditioning means for conditioning and displaying the signal from the accelerometer 12 in an appropriate state. The signal thus obtained (ie,
The signals corresponding to the press operating conditions) are amplified in three different ways and trimmed in an appropriate manner to obtain the press displacement, press speed and press acceleration. One of these selected signals, together with the RMS-to-DC voltage converter subcircuit, is conditioned by a peak-to-peak detector to the appropriate state. Now, at a particular DC level, this signal is then displayed by a voltmeter and displayed on a string of LEDs designed to glow at a particular voltage level, thereby indicating the unique type of signal. When these LEDs illuminate, it indicates which discrimination band of the severity level is currently being detected by the accelerometer 12.

The operating power for the system 10 is derived from a battery or battery pack operating at 5 volts rectified by a conventional design and usage Maxim M773 / M743 DC voltage rectifier (not shown). These types of rectifiers are capable of producing +/- 15 volts and 24 volts DC power. Other alternative power sources, such as AC adapters / transformers and the like, work equally well. The system 10 is small and portable and suitable for carrying by an operator with one hand.

Referring now specifically to the schematic diagrams of FIGS. 1 and 3, a single slide switch 14 is used to operate the system 10 and select its various modes of operation. Switch 14 is a three-position multi-throw switch. The operation mode does not operate when the battery is disconnected, the power is turned off, or the battery voltage is low. The power supply (not shown) includes a rectifier circuit and a voltage control circuit of a conventional design, and provides an output voltage of the power that operates the system 10. The power supply shown as conductor 16 operates at 24 volts. The constant current diode 18 is the accelerometer 12
To supply power to.

System 10 begins to operate upon the generation of an input signal generated by accelerometer 12. The accelerometer 12 is connected or mounted on the base or slide of a mechanical press (not shown). During operation of the press, its acceleration causes the accelerometer 12 to generate an output signal. This output signal is input to system 10 by a test lead or jumper cable to junction 90.

In addition, it is not necessary to stop the press operation to start the monitoring operation, and when connecting or mounting during the press operation, the accelerometer 12 is used for the non-rotating portion or the non-reciprocating motion of the press such as the press base. Connect or attach to the part.

The first functional block of the signal processing subsystem is that of a second-order high-pass filter 20 composed of an operational amplifier (OP AMP) 22. System 10
Most of the operational amplifiers used in the LF347N quad operational amplifier type available from National Semiconductor Company. The output of the secondary high-pass filter 20 is applied to a junction 24.

In the present application, a high-pass filter is defined to mean an electric filter that attenuates frequencies below a given frequency. Similarly, a low-pass filter is defined to mean an electrical filter that attenuates frequencies above a given frequency. Fifteen positive and negative volts from a power rectifier (not shown) are used to drive the operational amplifier of the present invention.

This secondary high-pass filter 20, shown with coupled resistance and capacitance, has a gain of approximately 0.0 Db at a frequency of approximately 1.0 Hz. Most of the specific resistance values and specific capacitance values are not shown because they are easily determined from the specifications of the operational amplifier to be used and the basic electric technology manual. Specific items that cannot be easily determined are the frequency, gain, and dimension of the high-pass filter to be used.

The conditioned signal emerging from the secondary high pass filter 20 at junction 24 is passed through conductor 26 and represents the acceleration of the press to be monitored. This signal is passed to a primary high-pass filter 28 using an operational amplifier 30 of the same type as described above. This high-pass filter has a gain of approximately 0.5 Db at a frequency of approximately 1.0 Hz.
Having. Primary high-pass filter 2 via conductor 26
The signal received by 8 is then trimmed and sent through output lead 32 to one contact of switch 14.

Starting from the junction 24 again, the speed integration means of the system 10 will be described. This sub-circuit starts with an operational amplifier 34 of the type described above, which is set up by a resistor and capacitor connection to produce an integrator having a gain of approximately 1.3 Db at a frequency of approximately 0.7 Hz. This trimmed signal passes through two capacitors 36 arranged in parallel. This signal then passes through a first order high pass filter 38 which includes an operational amplifier 40 of the type described above. This primary high-pass filter 38 has a gain of approximately 1.0 Db at a frequency of approximately 1.0 Hz. The output signal from the primary high-pass filter 38 is sent to junction 44 through conductor 42.

Continuing the analysis of the speed integrating branch circuit, the signal arriving at junction 44 is applied to a second order high pass filter 46 which includes an operational amplifier 48 of the type described above. This special arrangement of capacitance and resistance in the secondary high-pass filter 46 results in a gain of approximately 0.0D at an approximate frequency of 30.0 Hz.
Defines the criteria required to form a filter with b. This eliminates unbalanced press motion effects caused by press inertia, and does not interfere or be accounted for during speed measurements.

This output from the secondary high pass filter 46 is then applied as an input to a primary high pass filter 50 that includes an operational amplifier 52 of the same type as previously described. The positive terminal of the operational amplifier 52 is provided with a resistor 54 connected to a potentiometer 56 having both ends 58 and 60. The potential of one end of the potentiometer is negative 15 volts and the other end is positive 15 volts.
It is a bolt. The potentiometer 56 allows the circuit zero point to be set during calibration. The first-order high-pass filter 50 has a gain of approximately 1.4 Db at a frequency of approximately 30.0 Hz.

This output signal, conditioned by a preceding series of operational amplifiers, is then output through line 62 to the contacts of switch 14. The signal arriving at switch 14 through conductor 62 represents the speed signal of the press measured using accelerometer 12. The displacement integration means of the system 10 is shown as a third branch circuit branching off at the junction 44 from the velocity integration branch circuit. The conductor 66 attached to the junction 44 is the input line to the displacement sub-circuit 64. The press displacement sub-circuit 64 has three operational amplifiers 68, 70 and 72 connected in series and has its own coupling resistance and capacitance in a standard configuration. Operational amplifier 68
And 70 and 72 are the same LF347N quad operational amplifier described above.

The operational amplifier 68 is formed as a high-pass filter having a gain of approximately 0.0Db at a frequency of approximately 0.7 Hz. The output of operational amplifier 68 is applied as an input to displacement integrator 76. The displacement integrator 76 utilizes an operational amplifier 70 having a gain of approximately 0.7 Db at a frequency of approximately 0.7 Hz. The output of the displacement integrator 76 is then applied to the primary high-pass filter 7 utilizing an operational amplifier 72.
8 is applied as an input. This filter has a gain of approximately 0.8 Db at a frequency of approximately 3.0 Hz. This sub-circuit 6 comprising operational amplifiers 68, 70 and 72
The output of 4 is applied to the contact of switch 14 via conductor 80. This signal represents the displacement with respect to the press monitored by the accelerometer 12.

Depending on the signal selected by the user via switch 14, either the acceleration from lead 32, the velocity from lead 62, or the displacement from lead 80 may be passed through switch 14 along lead 82 to form the aforementioned type. Operational amplifier 8
6 is applied to a second-order low-pass filter 84. This filter has a gain of approximately 0.0Db at a frequency of approximately 1.0 kilohertz. The output of this secondary low-pass filter 84 is passed along line 88 to the detector and display sub-compartments of system 10 as shown in FIGS.

Before describing the detector subcircuit, the system 10
It is important to understand that has an additional circuit that indicates a closed or open circuit from the accelerometer 12. From junction 90, the signal level is passed to both an open circuit detector 92 and a closed circuit detector 94, as shown in FIG. Each of these detectors 92 and 94 is an LN339N quad.
A part of the comparator IC is used. The signal arriving from junction 90 indicates an open circuit when comparable to 24 volts input power and a closed circuit when comparable to approximately 3 volts. When the comparator IC 96 detects an open circuit, the attached L
Turn on ED98. When the comparator 66 detects a closed circuit, the LED 100 is illuminated.

Here, the detecting section processing means 101 will be described with reference to FIGS. Once the trimmed signal is passed from the filter sub-circuit via conductor 88, the signal is input to branch circuits 102, 104 and 106.

Both the positive peak detector and the negative peak detector branch circuits 102 and 104 are connected to the LF 34, respectively.
Utilizes a 7N quad operational amplifier. The positive peak detector and the branch circuit 102 are illustrated by a diode 112 (FIG. 3).
Operational amplifiers 108 and 110 connected in series in the direction
And The output from this positive peak detector is
Is added to The sub-circuit detects the positive peak value of the substantially sinusoidal signal introduced through conductor 88.

Similarly, negative peak detector branch circuit 104 includes operational amplifiers 114 and 116 connected in series by diodes 112 in the direction shown. Sub-circuit 104
Detects the negative peak value of the substantially sinusoidal signal introduced through conductor 88. The reset switch 120
A junction between the diode 112 and the operational amplifier 110 and a junction between the diode 118 and the operational amplifier 116 are connected. This reset switch is a positive and negative peak protection branch circuit 1.
Zero calibration is performed for both 02 and 104.

The output signal of the negative peak detector is conducted along line 122 to an operational amplifier 124. Operational amplifier 124 calculates the absolute value of the difference between the positive and negative peak detector branches. The absolute value of this difference is referred to as peak-to-peak. When the switch 14 is selecting displacement, the operational amplifier 124 determines the peak-to-peak displacement of the measured press vibration and outputs a corresponding signal. When switch 14 is selecting acceleration, operational amplifier 124 determines the measured peak-to-peak acceleration of the press vibration and outputs a corresponding signal. The output from this element is then
Through 6 is applied to the two contacts 128 and 130 of the switch 14.

As shown in FIG. 4, the contact 1 of the switch 14
28 provides a peak-to-peak acceleration signal,
0 gives a peak-to-peak displacement signal.

Referring back to the positive peak detector branch circuit 102 of FIG. 3, from lead 114, the circuit overload detector 131 utilizes an LM339N quad comparator 132. When an overload signal appears on lead 114, detector 131 causes LED 134 to illuminate. Depending on the accelerometer 12 used and the type of operational amplifier used, the overload threshold of the circuit will vary.

FIG. 3 shows another detector used in the system 10. A low battery detector 136 using the LM339N quad comparator determines whether the power supply, or battery, is below a threshold through selection of specific input values and resistance values. When the power supply, ie, the battery, is out of the specified voltage range, the brownout indicator LED 138 illuminates.

The last detector subsection branch in system 10 is a unique RMS-to-DC converter. Branch circuit 10
6 includes a plurality of operational amplifiers 142, 144 and 146 arranged in series, all of the aforementioned type. When the switch 14 is selecting vibration, the branch circuit determines the measured RMS vibration of the press and outputs a corresponding signal. As shown in FIG. 3, the polarity of diode 148 provides full wave rectification of the input signal from lead 88 and converts the varying signal to a well-defined DC voltage level.

This DC voltage level is supplied to the operational amplifier 146 through various resistance values and capacitance values, and this is averaged over time to obtain an RMS (RMS) equivalent to the press vibration detected by the accelerometer 12. Root mean square).
The outputs of the operational amplifiers 142, 144 and 146 have a specific RM
Create an S-DC conversion value and send it to conductor 150.

Referring to FIG. 4, this particular RMS signal is applied via lead 150 to a zero reference operational amplifier 1 of the type described above.
52. Zero calibration of the circuit can be performed using the potentiometer 154 during calibration. The output from this zero calibration stage is L along line 155 that carries this particular RMS signal.
It is sent to the row of the ED 156 and the contact 170 of the switch 14.

The row of LEDs 156, in this embodiment, includes four LEDs 160, 162, 164, and 166, which are background of the invention and US Pat. No. 5,094, assigned to the assignee of the present invention. No. 107 corresponds to four discrimination bands of the vibration severity level. The specification of U.S. Pat. No. 5,094,107 is expressly incorporated herein by reference.

As shown in FIG. 5, the vibration severity identification bands 1 to 4 are LEDs 160, 162, 164 and 1 respectively.
It is displayed by lighting any of 66. Four comparator ICs 168, LM339N quad comparator ICs drive each of the LEDs 160-166, according to the unique RMS signal applied through lead 155.

With reference to the specific resistance value of resistor 170 in series and the positive 15 volt level applied at node 172, the voltage applied from 154 is applied to each comparator 168 programmed with these resistance values. When the reference value is exceeded, each LED is turned on. LED 160 and 1
Each of 62, 164, and 166 represents four levels of the vibration severity identification band, as shown in FIG. In addition, LEDs 160-166 are color coded as shown in the following table.

[0067] LED display 182 is Comton Modtech part number BL
It is a numerical display using an embedded voltmeter like the type obtained from 102-103. The LED display 182 has a signal entering it from either lead 126 or lead 155, and this signal is displayed on the device faceplate.

The calibration is performed separately for acceleration, velocity, and displacement. A signal of known amplitude and frequency is input to the converter input 12. The potentiometer is then adjusted until the correct reading is displayed on the LED display. High pass filters 28, 50 and 78 include variable gain to calibrate acceleration, velocity and displacement, respectively. Since the value of the input signal and the value of the output display are functions of the selected resistance value and capacitance value throughout the entire circuit, the calibration is easy if one of these values is selected.

In addition, the connectivity of the device 10 includes an additional remote transmitting device, such as a modem 190 (FIG. 6), for transmitting vibration severity calculation data to a central office or remote data storage center. . The device 10 is connected to the modem 190 via a conductor 192. In this case, the device 1
0 indicates a modem 190 or other means, that is, a wireless communication device, the Internet, a telephone system, a local communication network (LA).
N) sending the measured acceleration or calculated speed, calculated acceleration or calculated displacement to the remote digital storage device via the wide area network. Known methods are used to transmit digital signal values via a remote transmitter.

Although the present invention has been described as having a preferred design, the present invention can be further modified within the spirit and scope of the present disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention which utilize the general principles of the invention. Further, this application is intended to cover any new developments from the present disclosure, as they fall within the known or customary skill in the art to which this invention pertains and fall within the scope of the appended claims. I have.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating one embodiment of a signal filter portion of a circuit of the present invention.

FIG. 2 is a diagram showing one embodiment of a signal filter portion of the circuit of the present invention.

FIG. 3 is a diagram showing a part of the present invention together with an RMS-to-DC conversion part of the positive and negative detection circuits.

FIG. 4 is a diagram showing a part of the present invention clarified together with a display indicator.

FIG. 5 is a front view of the portable device of the present invention.

FIG. 6 is a front view of a portable device of an alternative embodiment of the present invention connected to a modem.

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Robert E. Crane United States, 45869 Ohio, New Bremen, E. Front Street 225 (72) Inventor Kevin J. Ever United States, 45846 Ohio, Fort Recovery, N. Main Street 108 (72) Inventor David Scroller Sunset Drive 2801, 48503 Michigan, U.S.A. United States (56) References Japanese Unexamined Patent Publication No. 5-285889 (JP, A) 58-36325 (JP, U) US Patent 5094107 (US, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B30B 15/00 G01H 17/00

Claims (10)

(57) [Claims] 1. A portable device mountable on a mechanical press for measuring a press condition, said device comprising: an accelerometer for measuring a press condition and generating a corresponding signal; Portable signal processing means connected to the accelerometer for processing and processing the corresponding signal, the signal processing means comprising: acceleration processing means for calculating a press acceleration signal; and press speed signal calculation. Processing means for calculating a press displacement signal; display means for displaying at least one of the calculation signals; acceleration processing means, speed processing means and displacement processing Means connected together with a means, the switch being capable of being selected by an operator for inputting one of said calculated signals to said display means. 2. The apparatus according to claim 1, wherein said display means includes means for measuring a voltage of said calculation signal, and means for displaying said voltage indicating a pressed state. apparatus. 3. The display device according to claim 1, wherein said display means includes a plurality of LEs arranged so as to emit light in predetermined predetermined applied voltage ranges.
2. The device of claim 1 including D, whereby the illuminated LED represents a specific range for signal input to the display means. 4. The device according to claim 3, wherein the LEDs shine in different colors according to a predetermined applied voltage range. 5. The apparatus according to claim 1, wherein said acceleration processing means includes a first-order high-pass filter. 6. The speed processing means comprises: a signal integrator, a first-order high-pass filter, a second-order high-pass filter,
The apparatus of claim 1, comprising: a first-order high-pass filter; 7. The displacement processing means includes a signal integrator, a first-order high-pass filter, a second-order high-pass filter,
A second signal integrator and a second primary high-pass filter;
2. The device of claim 1 wherein the devices are included in series. 8. The apparatus according to claim 1, wherein said signal processing means includes a second-order low-pass filter for reducing a high-frequency signal applied to said display means. 9. The method of claim 1 wherein the speed processing means includes a high pass filter having a frequency band above about 30 Hertz, thereby removing low frequency signals to prevent measuring press inertia effects. An apparatus according to claim 1. 10. The method according to claim 1, wherein
Preparing a portable monitoring device, attaching a press sensor to the press, connecting the press sensor to the portable monitoring device, operating a press, identifying on the monitoring device. Based on the visual display of the band,
Determining a vibration severity level. A method of monitoring a vibration severity level in a press, comprising: