JPS6147660B2 - - Google Patents

Description

Detailed Description of the Invention The present invention provides a vibrating barrel processing machine that applies vibration by rotating two unbalanced weights, in which the vibration amplitude of the vibrating barrel is detected by a sensor and the maximum amplitude or specified The present invention relates to a method and apparatus for controlling an excitation force (hereinafter referred to as excitation force) that changes by changing the advance angle, rotation speed, or advance angle of an unbalanced weight so that the amplitude becomes the same.

Conventionally, in vibrating barrel machining, it has been important to maintain the vibration amplitude at an optimal value while machining the workpiece, but these measurements have relied on visual inspection. This vibration amplitude is varied by changing the advance angle, rotation speed, or excitation force of the unbalanced weight. However, in the present invention, the vibration amplitude is detected by a sensor, and the advance angle or rotational speed or weight of the unbalanced weight is controlled by a processor so as to reach a predetermined set value or a maximum value. The rotational speed of the unbalanced weight can be controlled by a known inverter, and the weight of the unbalanced weight can be controlled by the applicant's Japanese Patent Application No. 126902/1983 or Japanese Patent Application No. 56/1989.
It can be controlled by the device of the invention of No. 156401.

Next, control of the advance angle of the unbalanced weight will be described in detail below along with embodiments.

Generally, the advance angle of the unbalanced weight in a vibrating barrel processing machine is fixed, and in order to change this, it was customary to stop the operation of the processing machine. Recently, advances in electronics have led to the creation of devices that automatically set the value to a constant value, but no device has been developed that can always maintain the value at the optimum value as processing conditions change. However, according to the present invention, an accelerometer or a displacement meter is used as a sensor and the advance angle is automatically controlled so that the vibration amplitude of the vibration tank is always maintained at the set value or the maximum value. Not only does it have the advantage of automatically maintaining proper machining conditions even if the vibration mode changes due to changes in conditions or the amount of compound, but it also prevents changes in machining conditions when changing media or workpieces. It is also possible to automatically switch between rough machining, fine machining, and sorting conditions, and maintain them at the optimum conditions, thereby successfully creating an ideal vibrating barrel processing machine.

The details of this invention will now be explained with reference to the accompanying drawings. As shown in FIG. 1, a large number of springs 17 are arranged on a base 16, and a barrel tank 1 has an inner cylinder 19 on the springs 17.
8 are suspended in a vibrating manner. The inner cylinder 19
Inside, two general-purpose AC motors 1 and 2 are fixed so that their rotating shafts are aligned in a straight line, and an unbalanced weight 4 is attached to the tip of each shaft.
5 is fixed. The two electric motors are connected to a commercial frequency power source 10 via frequency converters 3, 3a and rotated at variable rotation speeds. An accelerometer 20 is fixed to the outside of the barrel tank 18 as a sensor for measuring the vibration amplitude of the barrel tank. It is known that the output of an accelerometer is generally related to amplitude, and the signal of the accelerometer 20 is processed by an electronic automatic controller (abbreviated as a processor) 8.
is input. On the other hand, sensing elements 12 and 13 are fixed to the unbalanced weights 4 and 5, respectively, and each proximity switch of the upper and lower proximity switch groups 6 and 7 is made up of a large number of proximity switches arranged concentrically with the trajectory of the sensing elements 12 and 13, respectively. It is designed to respond and generate a signal. These signals are respectively input to the processor 8. As a result, the processor 8 processes each electric motor 1,
It is possible to detect at what position the two unbalanced weights 4 and 5 are rotating, that is, the rotation angle phase of the unbalanced weights 4 and 5. The output of the processor 8 is connected to the frequency converters 3, 3a, and controls the rotation of the electric motors 1, 2 as described later.

The display panel 9 is equipped with instruments for displaying necessary indication values, such as the number of revolutions of each motor, the phase angle of the unbalanced weight, the input voltage, the motor current, and the current frequency generated by the inverter.

In the above example, an accelerometer 20 is used as a sensor.
However, it is also possible to use a displacement meter (either non-contact type or contact type), and a pulse generator can be used in place of the proximity switch groups 6 and 7 to generate signals corresponding to each phase of the unbalanced weight. Alternatively, a pulse may be generated.

In the above, the vibration amplitude of the pulse tank 18 (inputted to the processor as a signal value G from the accelerometer 20) and the rotation angle phase (lower end) of the unbalanced weights 4 and 5 (signals from the proximity switch groups 6 and 7) (detected by the processor based on the value), the highest point is at a certain advance angle (rotation angle phase), and the machining efficiency is highest at this position. A flowchart for keeping G at the highest value at this time is shown in FIG. This principle is the second
The explanation is as follows using a diagram.

First, an initial value β ₀ of the advance angle β is determined. If G increases when β is increased, β is increased until it falls. Conversely, if G decreases when β is increased, β is decreased until it decreases. If it goes down, go back one step to the maximum value and repeat the check at appropriate intervals. Further, a flowchart for setting G to a set value is shown in FIG. In this case, repeat the same operation as in the case of FIG. 3 until G becomes close to the set value G. Also, by setting the G position to a large value (or maximum value) initially and converting it to a smaller value after a certain period of time, precision machining can be performed successively after rough machining. Efficiency can be improved.

Further, as shown in FIG. 5, a vibrating barrel processing machine equipped with a sorting device can be similarly controlled by signals from a sensor. In this case, the same parts are indicated by adding 100 to those in FIG. Of course, in the case of a sorting device, conditions suitable for sorting can be controlled in the same manner as described above.

That is, in the embodiment shown in FIG. 5, a large number of springs 117 are arranged on a base 116, and a barrel tank 118 having an inner cylinder 119 is suspended on the springs so as to be able to vibrate. Two general-purpose AC motors 101 and 102 are fixed to the inner cylinder 119 with their rotating shafts aligned vertically, and unbalance weights 104 and 105 are fixed to the ends of the rotating shafts of each motor. The two electric motors 101 and 102 are each connected to a commercial frequency power source via a frequency converter (similar to the embodiment shown in FIG. 1), and are rotated at variable rotation speeds. In order to detect the rotation angle phase of the unbalanced weights 104 and 105, as shown in FIG.
Sensors 112, 113 for proximity switches are fixed on the tip side of 4, 105, and a proximity switch group 106, 1 consisting of a large number of proximity switches is attached to the outer periphery of the sensors 112, 113 for proximity switches.
07 are arranged in a ring shape, and are designed to emit a signal depending on the sensitivity of the sensors. This signal is input to the processor, and the processor can detect in what position the unbalanced weights 104 and 105 of each electric motor are rotating. Therefore, it is possible to control the advance angle to a constant value. In Fig. 5, 109 is a rotating weir, 11 is a sieve, and 120
is an accelerometer for detecting the vibration amplitude of the barrel tank 118.

The lead angle conversion device is as follows. The processor 8 can recognize the positional relationship between the unbalanced weights 4 and 5 based on the signals emitted by the proximity switch groups 6 and 7, and when the advance angle β is not within the specified angle, it advances the rotation speed of one of the weights (or When the lead angle of both motors reaches the specified lead angle, both electric motors are rotated at the specified number of revolutions and checked to ensure that they always maintain the same lead angle. In other words, when the rotational speed of the motor is constant during steady operation, one frequency converter is sufficient, but when it is desired to change it, two frequency converters 3 and 3a are needed as shown in Figure 1.
A stand is required.

That is, according to this invention, the vibration amplitude of the barrel tank is detected by a sensor, its output is transmitted to the processor, and the vibration amplitude is controlled so that the output becomes the maximum value or a set value, so that the vibration amplitude is automatically controlled. By controlling the advance angle, rotation speed, or weight of the balance weight, rough polishing or final polishing can be carried out with high efficiency under the best conditions. Moreover, since each of the above-mentioned controls can be performed during operation, there is also the effect of improving the operating rate.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of an embodiment of the present invention, Fig. 2 is a diagram showing the relationship between the advance angle and the signal value G from the sensor, and Fig. 3 is a diagram showing the relationship between the advance angle and the signal value G from the sensor. a flowchart showing the operation of
FIG. 4 is a flowchart showing the operation of the processor to save the sensor signal value G as a set value.
FIG. 5 is a front view of an example in which the present invention is applied to a vibrating barrel processing machine equipped with a sorting device. 1, 2, 101, 102...General-purpose AC motor,
3, 3a...frequency conversion device, 4, 5, 104,
105...Unbalanced weight, 6,7,10
6,107...Proximity switch group, 8...Processor, 9...Display panel, 10...Commercial frequency power supply,
109... Rotating weir, 11... Sieve, 12, 13, 1
12,113...Sensor, 16,116...Base, 17,117...Spring, 18,118
... Barrel tank, 19,119 ... Inner cylinder, 20,
120...accelerometer.

Claims (1)

[Claims] 1. The vibration amplitude of the barrel tank is detected by a sensor, the output signal of the sensor is input to a processor, and the vibration amplitude is controlled so that the output signal of the sensor becomes a maximum value or a set value. A vibration control method for a vibrating barrel processing machine. 2. The vibration control method for a vibratory barrel processing machine according to claim 1, wherein the vibration amplitude is controlled by changing the advance angle of an unbalanced weight of the vibratory barrel processing machine. 3. The vibration control method for a vibrating barrel processing machine according to claim 1, wherein the sensor for detecting the vibration amplitude is an accelerometer or a displacement meter. 4. The vibration of the vibrating barrel processing machine according to claim 1, characterized in that there are two or more types of set values, and the vibration is controlled to match these set values at regular intervals of time. Control method. 5. Two AC motors are placed and fixed side by side on the same axis below the center of the barrel tank, and unbalanced weights are attached to the tips of the rotating shafts of each motor, and the rotating shafts of both motors are rotated to unbalanced weights. In a vibrating barrel processing machine that applies vibration to a barrel tank by centrifugal force generated by the machine and processes a workpiece in the barrel tank, a frequency converter is connected to at least one of the AC motors, and a frequency converter is connected to the barrel tank. A sensor for detecting the vibration amplitude of the barrel tank is installed nearby, and a detection device for detecting the rotation angle position of the unbalanced weight is fixed outside the unbalanced weight, and the output of the detection device is fixed to the outside of the unbalanced weight. can be input to the control device,
Detecting the rotational speeds of both electric motors and inputting a signal voltage caused by the difference between the two to a frequency converter, so that the rotational speeds of both electric motors can be synchronized by changing the rotational speed of one of the electric motors,
The output from the sensor for detecting the vibration amplitude is connected to be input to the control device, and the output voltage from the control device applied to the frequency conversion device is controlled so that the vibration amplitude becomes a local maximum value or a set value. A vibration control device for a vibrating barrel processing machine, characterized in that the rotational speed of the electric motor is made variable, and after the vibration amplitude reaches a specified value, the motor is rotated again at the synchronous speed. 6. The vibration control device for a vibrating barrel processing machine according to claim 5, wherein the sensor for detecting the vibration amplitude of the barrel tank is an accelerometer or a displacement meter.