DE2247605A1 - PROCEDURE FOR OPERATING ELECTROMAGNETIC VIBRATION GENERATORS WITH STOP GUARD - Google Patents

Description

Method for operating electromagnetic vibration generator with Stop monitor The invention relates to a method for operating electromagnetic Vibration generator with stop monitor making optimal use of the possible Stress range.

It is known that electromagnetic vibrators are mechanical have a limited oscillation range that is not fully exploited due to acidic interference may be. If this happens anyway, the vibration generator becomes permanent Stop of armature and electromagnet destroyed It has already been proposed to Avoidance of destruction an automatic vibration amplitude limitation, a so-called Stop monitor to be used. The energizing energy is generated after a stop reduced for an adjustable period of time. Then it goes straight to full power switched.

The direct upshift to full power after the one The reduction caused by the stop brings operational disadvantages. When switching on and in the event of a stroke, there is a temporary reduction in output and then a direct upshift to full power. Any direct upshift causes a brief increase in the amplitude, their size depends on the jump in performance. In order not to go into stop mode, the switch-on process must be vorgenotnraen with reduced power, and for the full power, the optimal possible vibration range cannot be used. this means loss of performance.

Another disadvantage is that the distance between is full and reduced power cannot be chosen arbitrarily large. With too big The distance is reduced again because of the increase in amplitude when maintaining the high position the performance through a one-time attack. If the distance is too small, large Interferences are no longer regulated and the destructive stop operation remains.

Finally, a direct-switching stop monitor is proportionate large, expensive and, due to the switching element, prone to failure.

The purpose of the invention is to eliminate the technical defects without complicated Eliminate control devices in order to reduce the economic effort.

The invention is based on the object by means of a suitable method when operating electromagnetic vibration generators with a limit switch, this is the optimal one To achieve exploitation of the vibration range.

According to the invention, the object is achieved in that that when they hit each other arising from the armature and electromagnet of a vibration generator in a known manner Signal triggers the reduction in power within a certain period of time, the time-determining element, however, is designed so that the performance is already from the moment of reduction to the full operating value steadily is increased. This can be done, for example, by slowly discharging one when it stops directly or indirectly charged capacitor can be achieved by a resistor. The discharge controls the actuator, preferably via a pre-strengthening component a thyristor or transducer, and thus causes the constant change in power of the vibrator. Furthermore, the effect can be hydraulic or pneumatic can be achieved by e.g. 3. a pressure difference built up at the stop a compensating hole is removed and preferably using standard standard modules the vibration generator is influenced by an actuator. About that In addition, the inventive method includes that the functionality of the Stop monitor during the switch-on process by a suitable delay a few milliseconds is reached.

Therefore, a vibration generator can be activated immediately after being switched on optimal utilization of the oscillation range, since the switch-on inevitably occurring one-time stop remains ineffective.

The steady increase in performance after a stroke disorder allows it, the difference between full and produced power beneficial for the given To select the operating mode and to make optimal use of the amplitude at full power, since the increase in amplitude no longer occurs. This procedure when operating electromagnetic vibration generators with stop monitors brings a significant higher average power, because compared to the known method, the amplitude can be optimally used, the full power immediately when switched on is available and after a stop with a subsequent reduction in performance same immediately steadily increases again.

The contactless "switching" brings a higher functional reliability. The elimination of the large and expensive switching element also results in a smaller one and cheaper stop guards.

The invention is to be described in more detail below using an exemplary embodiment are explained: In the accompanying drawing Figure 1 - basic circuit diagram, Figure 2 - utilization of the stress range for some operating states in the preliminary comparison between known and inventive method. When reaching the mechanical maximum possible oscillation range of the electromagnetic oscillation generator it comes between Armature 1 and electromagnet 2 for mechanical contact, which is referred to as a stop will. This stop gives a signal in a known manner by which, for example an applied auxiliary voltage 3 charges a control circuit 4, which via the stop monitor 5 activates the power limiter 6. The stored energy flows, for example through a resistor and love the power reduction steadily.

With the well-known stop monitor for electromagnetic vibration generators the power is shifted up directly. This results in amplitude peaks, which are proportional to the switched power differences. So that these amplitude peaks cannot necessarily cause a stroke disorder, but between possible and the existing oscillation range, a sufficiently large safety distance is maintained will. This operating point is below an optimally possible utilization of the Stress range. In the method according to the invention for operating electromagnetic Vibration generators with stop monitors occurs after an attack disorder no sudden increase in performance, but rather a steady upward regulation. This eliminates the amplitude peaks and the vibration generator can with a optimal utilization of the oscillation range. The resulting from the win-shifting process The peak of the amplitude does not cause the stop watch to intervene because it is functioning begins with a delay.

In Figure 2 is the resulting increase in performance by Schratfur made known. The broken lines show the utilization of the stress range according to the known method. The solid lines show the invention Course of the stress range utilization.

Section A shows the switch-on process, section B shows the effect in the event of a stop failure, section C shows the operating behavior in the event of a large difference between operating status and reduced power due to the limit switch.

Claims (6)

Patent claims Method for operating electromagnetic vibration generators niit Stop guard with a signal using the stop zvjischen armature and electromagnet is generated and a time-limited power reduction after one Stop is characterized in that the power of the electromagnetic Vibration generator immediately after the power reduction has taken place a time-determining element is steadily increased up to the full operating value. 2. The method according to claim 1, characterized in that the functionality of the stop monitor is delayed during the switch-on process by a suitable structure begins. 3. The method according to claim 1 and 2, characterized in that the Milfsengergie (3) is preferably an electrical voltage. 4. The method according to claim 1 and 3, characterized in that the steady increase in output after a reduction in the stop due to slow discharge a capacitor that is directly or indirectly charged when it is hit by a resistor is made. 5. The method according to claim 2 and 3, characterized in that the Delay in the functionality of the limit monitor when switching on is reached capacitively. 6. The method according to claim 1 and 2, characterized in that as Auxiliary energy pressure differences, preferably pneumatic or hydraulic Systems is used.