JPH01257225A - Alarming device for amplitude of vibrating apparatus - Google Patents

Abstract

PURPOSE:To enable the sure generation of an amplitude alarm at low cost, by detecting whether the amplitude of a vibrating body is within a prescribed range by means of one distance sensor. CONSTITUTION:A proximity sensor 24 is screwed and fixed by a pair of nuts 22 and 23 on an electromagnet 21 on the drive side 3 being opposite to a movable core 20 of a trough 2. When a distance (b) between a detecting surface of the sensor 24 and the surface 20a of the movable core 20 narrows and gets out of a prescribed range, an alarm can be generated surely by a control circuit connected through a cable 25.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an amplitude alarm device for a vibrating device that issues an alarm when a vibrating body vibrates with an amplitude outside a predetermined range.

[Conventional technology and its problems]

Generally, unmanned operation of vibrating equipment requires operation within a certain concave amplitude range, and if the vibration range deviates from this range, it is necessary to issue an alarm. For this purpose, a control circuit as shown in FIG. 8 has conventionally been used.

FIG. 8 shows a constant amplitude vibration control circuit of a conventional electromagnetic vibration feeder (1). are connected via a leaf spring (not shown), and the driving part (3) has an electromagnet and attracts the movable core on the trough (2) side in an alternating current manner to cause the trough (2) to fully vibrate. However, the electromagnet of the drive section (3) is supplied with a drive current that is controlled in accordance with the control current supplied to the gate (5a) K via the thyristor (5). Trough (2
) is provided with an amplitude detector (4), the output of which is supplied to the amplitude/pressure converter (6), which is rectified by a full-wave rectifier circuit (7) and sent to a comparator α4. It is designed to be compared with the set amplitude in the setting device (8).The output of this comparator α is supplied to the ignition circuit QO via the PI adjustment section (9) and the changeover switch (6). A current is supplied to the gate (5a) of the thyristor (5) according to the output of the comparator (14).

And nine! The drive current of the electromagnetic vibration drive unit (3) is adjusted so that the trough (2) is captured with a predetermined amplitude.
Conventionally, when 1 becomes larger than a predetermined value, the alarm circuit (2) issues an alarm, and the thyristor ignition circuit (1)
The electromagnetic vibration feeder (1) was stopped by the action of 0.

In other words, the electromagnetic vibration feeder (1) is a so-called resonance-type vibrating device, and when the trough (2) becomes full of material to be transferred, the movable mass increases, and this causes the resonance frequency of this vibration system to become the driving force at this time. The amplitude increases as it approaches the frequency,
Depending on the amount of deposited material to be transferred, the amplitude of the trough may be greater than the gap between the movable core and the electromagnet, which may damage the movable core or the trough itself. this? In order to prevent this, an alarm is issued and the electromagnetic vibration feeder (1) is stopped when the above-mentioned value 10a exceeds a predetermined value.

Further, depending on the amount of attached material to be transferred, the driving frequency may exceed the resonance point of the vibration system and deviate greatly, resulting in a decrease in amplitude. The output -a of the comparator α may exceed a predetermined value (absolute value). A warning is also issued in such cases.

However, such control circuits are very expensive and have the disadvantage that they are too expensive to be used simply to issue an alarm when the amplitude is out of a predetermined range.

[Problems to be solved by the present invention]

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a vibration width warning device for a vibrating device that can issue an alarm when the vibration width falls outside a predetermined range at a lower cost than the conventional apparatus.

[Failure to solve the problem]

The above-mentioned problem lies in the amplitude alarm system for vibrating equipment that issues an alarm when the amplitude of the vibrating body exceeds a permissible range.
disposing a distance sensor close to the vibrating body, setting an eleventh second electrical level that can be compared with the output of the sensor;
The problem is solved by a vibration amplitude alarm device for a vibration device, characterized in that an alarm is issued when the output of the distance sensor deviates from between the eleventh and second electrical levels while the vibrating body is vibrating. .

Alternatively, it comprises a vibration system including at least two masses,
A distance detection element is provided in a part of one of these masses, a detected part is provided in the other part at a predetermined interval from the distance detection element, and a first , a second electrical level is set, and while the vibrating body is vibrating, the output of the distance sensor is set to the WJ1, the second electrical level.
The problem is solved by a vibration alarm device for a vibrating device, which is characterized in that it issues an alarm when the electrical level falls outside the range.

[For production]

Since a single distance sensor or distance detection element simply detects whether the amplitude of the vibrating body is within a predetermined range and issues an alarm when it is outside the range, the cost of the device can be significantly reduced compared to conventional methods. can be lowered. Further, depending on the size of the predetermined range, it is possible to obtain a stable amplitude close to conventional constant amplitude control.

Furthermore, since the predetermined range is set by the electrical level, its adjustment is extremely easy.

〔Example〕

Hereinafter, a vibration width alarm device for a vibrating device according to an embodiment of the present invention will be described.

1 and 2 show the principle of operation of an embodiment of the present invention, which will first be explained.

The electromagnetic vibration feeder (1) shown in Fig. 8 has a two-mass system as a vibration system as shown in Fig. 1, the mass of the trough (2) is 7711, the mass of the entire drive side is 7 nt, and the plate that connects these. Although not shown in FIG. 8, assuming the spring constant of the spring is 2, in reality, the pace side is supported on the ground by a spring, or the trough (2) is suspended from a part of the building. Figure 1 shows a case where the drive side (3) is supported by a spring on the ground, and this spring constant is k.

If this is the case, the overall vibration system is shown in Figure 1, and when an alternating current is applied to the electromagnet installed on the drive side, p-cos
An alternating attractive force ωt is generated, and as a result, the masses mIX vibrate with a phase difference of 180° from each other. That is, if the vibration of the trough is T and the vibration of the drive side is B as shown in Fig. 2, then 18 as shown in Fig.
t) °The vibrations are made with a different phase, but the relative distance between the vibration T on the trough side and the vibration B on the drive side when viewed from one side to the other is the theoretically determined quality of the trough it ml
, and the driving side mass m2, and there is a relationship such as the closest approach distance t (where At = trough width, Am = driving side amplitude), and t" 7E ' and x, -=.

Embodiments of the present invention utilize such relationships.

That is, when the amplitude of the trough (2) is outside a predetermined range, an alarm is to be generated, but the amplitude At of the trough (2) is
Rather than detecting the distance t between the trough (2) and the drive side (3), it is detected that the distance t between the trough (2) and the drive side (3) is outside a predetermined range, and an alarm is generated accordingly.

FIG. 3 shows a vibration amplitude alarm device for vibrating equipment according to the first embodiment of the present invention, and this embodiment is applied to an electromagnetic vibration feeder as shown in FIG. (2) The drive side (3) opposite the movable core
), for example a part 211 of the electromagnet, is provided with a proximity sensor +241.

This proximity sensor (241 is a pair of oak) 1221G2
3 is screwed and fixed to part Q11 of the stain magnet, and the cable for extracting the detection signal from this sensor (241) is connected to a control circuit (not shown).Sensor C
! A part of the mass (e) on the trough (2) side facing from the ooze detection surface is made of metal, and this surface (20a)
The distance between C>41 and sensor C>41 is assumed to be b, and from this state, due to the vibrations on the trough (1) side and the drive side (3), they approach each other at a distance smaller than b, but if the distance between them is outside the predetermined range. If this happens, an alert will be issued.

That is, two electrical levels are defined in the control circuit connected to the cable 4 to be compared with the output of the sensor. The output of the sensor (J41) changes as shown in Figure 4A due to the vibrations of the trough (2) and the driving side (a).The output level of the sensor (J41) is inversely proportional to the distance between them. In the circuit, electrical levels 8, .
8. is set. When the peak of the output S of the sensor C441 is between 8 degrees and the level S shown in FIG. 4A, no alarm is generated, but when it falls below the level S or exceeds the level S, an alarm is generated. In addition, sensor c! 41
The AC output S may be full-wave rectified as shown in FIG. 4B, and then its peak may be compared with the set level S, , S,. Alternatively, comparison may be made after half-wave rectification.

Therefore, due to the alarm, the person managing the electromagnetic vibration feeder (1) now knows that the trough (2) has either too much vibration or too little vibration for some reason. For example, if the oscillation width becomes too large or too small due to the adhesion of transferred material to the trough (2), by removing this adhering material, the trough of the electromagnetic vibration feeder (1) will return to the permissible range. It begins to vibrate within.

FIG. 5 shows a second embodiment of the present invention, and this embodiment is also applied to an electromagnetic feeder, and the movable core mounting portion t4Q on the trough (2) side is equipped with an armature cap made of a magnetic material. are fixed integrally, and an electromagnet 144) opposite to this is fixed to the stationary block 43 with a gap t therebetween.

A coil (451) is wound around the electromagnet so that an alternating current can pass through it.Then, a movable core (
41) Projecting to the side, the detected part mounting member 4? ) is fixed, and a bolt 61 serving as a detection unit is attached to this so that the force can be adjusted. A sensor mounting member (4b) is integrally formed opposite to this electromagnet (protruding from the side of the wall), and a proximity sensor (2) is fixed to this, and a control circuit (also not shown) is output from this. Furthermore, the core attachment member f40 on the trough (2) side is fixed to the center of the leaf spring 1421, and both ends of this leaf spring 1421 are fixed to the fixed pace block C3 (not shown). 2) As is well known, the trough (2) side is supported so as to be able to vibrate.

In addition, in this embodiment, the air gap 2 between the movable core 1411 and the electromagnet
Furthermore, the distance G between the sensor 48 and the opposing detected portion 6 is configured to be large.

With the above configuration, when the distance between the sensor (48) and the detected part 6 is outside the predetermined range, an alarm is issued in the same way as in the above embodiment, but in this embodiment, G is larger than t, so Even if there is a large vibration, the sensor (4 sudden is the detection part 6I)
There is no collision with the electromagnet, and the sensor is protected by the collision with the moving core (41) and the electromagnet. (4
4J will not be damaged.

FIGS. 6 and 7 show a vibration width alarm device for a vibrating device according to a third embodiment of the present invention, and this embodiment is applied to a vibrating conveyor.

That is, FIG. 6 shows the entire photographic conveyor, including a trough (51 is the base! 511) and a plurality of inclined leaf springs (52
The base (511) is supported on a vibration-proof, splash-proof surface. A drive section (531) consisting of a motor and a crank section is provided on the base (511), and a drive rod 541 and a shaft (511) are connected to each other by The power of the tiger 251 Km is transmitted through the spring 551 for absorbing force.

A sensor mounting column 59 is further attached to the base 1511, and the sensor 5g is attached to this. In this embodiment, the detected member 5η is attached to the trough (5(1), which is the trough 7 as shown in FIG.
The sensor (581) is separated from the sensor (581) in the longitudinal direction of 6I, and as shown in Fig. 7, the trough (5o) and the base 611 are photographed with a 1000 degree difference in position. The mounting surface of the sensor body No. 01 of the sensor 585 faces in a direction perpendicular to the vibration direction of the trough 6I and the base 611 so that the member (57) and the sensor 6& do not collide.

That is, it is arranged so that the sensor body field and the member 6 do not collide even if the trough side swings excessively.

In this embodiment as well, the trough side is busy so as to issue an alarm when the swing width is outside the predetermined range, that is, the relative distance between the trough 15G and the base 6υ is outside the predetermined range.

Although each embodiment of the present invention has been described above, the present invention is of course not limited to these embodiments, and various modifications can be made based on the technical idea of the present invention.

For example, in the above embodiments, the detected portion was provided on the trough side and the sensor was attached on the driving mass side, but this may be reversed. That is, the detected portion may be provided on the driving mass side, and the sensor may be attached on the trough side.

In addition, when providing a detected part on the trough side, the sensor can be configured so that, for example, a part of the plate connecting the trough side and the driving mass side is used as the detected part, without providing a special member for this purpose. may be attached to the driving mass side.

Further, in the above embodiments, a two-mass system was explained as the vibration system, but the present invention is also applicable to a one-mass system. In this case, it is assumed that in a two-mass system, one quality is 1tFi, which is the earth or 5, or an infinite mass. Also, 2
The present invention is also applicable to more than a mass system, for example, a three-mass vibration system.

〔Effect of the invention〕

According to the vibration amplitude warning device for a vibration device of the present invention, it is possible to reliably issue an alarm when the vibration width falls outside the allowable vibration range at low cost. Furthermore, the allowable swing width range can be easily set.

[Brief explanation of the drawing]

Figure 1 is a model diagram of a two-mass system for explaining the principle of the embodiment of the present invention, Figure 2 is a graph explaining the action of the model, and Figure 3 is a diagram of the model of the first embodiment of the present invention. 4A and 4B are graphs showing the output of the sensor in the device; FIG. 5 is a front view of the main portion of the device of the second embodiment; FIG. 6 7 is a side view of the vibrating conveyor according to the third embodiment, FIG. 7 is an enlarged sectional view of the main parts thereof, and FIG. 8 is a block diagram of one circuit of a conventional 11Jll constant swing width control bond. In the figure,

Claims (4)

[Claims] (1) In an amplitude alarm device for a vibrating device that issues an alarm when the amplitude of a vibrating body exceeds a permissible range, a distance sensor is placed close to the vibrating body, and the output of the sensor is compared. first and second electrical levels to be obtained are set, and while the vibrating body is vibrating, the output of the distance sensor is set at the first and second electrical levels.
, a vibration amplitude alarm device for a vibration device, characterized in that an alarm is issued when the electrical level falls outside of the second electrical level. (2) A vibration system including at least two masses is provided, a distance detection element is provided in a part of one of these masses, and a detected part is provided in a part of the other mass at a predetermined distance from the distance detection element. , a first signal that can be compared with the output of the distance sensing element.
, a second electrical level is set, and an alarm is issued when the output of the distance sensor deviates from between the first and second electrical levels while the vibrating body is vibrating. Vibration alarm device for vibrating equipment. (3) The vibrating device has an electromagnetic drive section, a part of one of the two masses is a movable core, and a part of the other mass is an electromagnet, and the distance sensing element and the detected part are connected to each other. The vibration amplitude alarm device for a vibrating device according to claim 2, wherein the predetermined interval is set to be larger than the size of the gap between the movable core and the electromagnet. (4) The distance sensing element and the sensing section are arranged on a plane that is substantially perpendicular to the direction of vibration of a portion of the two masses so that they do not collide with each other even if the two masses vibrate with an excessive amplitude. The vibration amplitude alarm device for a vibration device according to claim (2), wherein the vibration amplitude alarm device is installed.