JPS6017730B2 - Hopper quantitative discharge device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for electronically quantitatively discharging powder or granules in a hopper.

With conventional quantitative dispensing devices using mechanical scales, it is very difficult to manufacture large or extremely large ones in terms of structure and cost, but the present invention takes this into consideration and generates a target function. It is an object of the present invention to provide a device which performs quantitative discharge by subtracting the electric signal from the hopper with an electric signal equivalent to the weight of the material in the hopper, and driving the device based on the subtracted value. explain. In Figure 1,
Reference numeral 1 is a scale hopper for temporarily stocking the material inputted from the previous process to the quantitative discharge device so that its weight can be detected, reference numeral 2 is a load cell, and reference numeral 3 is a load cell amplifier.

In addition to the strain gauge type load cell as in this embodiment, the load cell 2 may include a magnetostrictive type load cell, a differential transformer, etc., as long as it can convert weight into an electrical signal, and can detect the weight of the material in the hopper. and converts it into an electrical signal. Next, a frame 4 surrounded by a two-dot chain line indicates a control section, which includes a setting section 5 for presetting the discharge rate of the device according to the present invention, and a setting section 5 which receives a signal from this setting section 5 and has an inclination equal to the above discharge rate. The target function generation section 6 generates a target function having a value of , and the subtraction section 7 subtracts a signal corresponding to the weight of material in the hopper 1 from the target function and supplies the result to the discharge machine controller 8. That is, the target function generating section 6 is a section that generates an electrical signal corresponding to the material reduction curve shown in FIG. 2 in the scale hopper that is predicted when the required discharge amount per unit time is quantitatively discharged. The required discharge amount per unit time is electrically set using a setting device, while an electrical signal corresponding to the weight of material in the scale hopper at the start of discharging is memorized, and electrical settings are made using this memory point as a starting point. A ramp function with a negative slope equal to the required discharge amount per unit time is generated, and this is used as the target function. The subtraction unit 7 is a part that subtracts a signal corresponding to the electrically detected material weight in the scale hopper 1 and the target function. Further, in this embodiment, an electromagnetic feeder is used as the discharger 9, but it goes without saying that any device with variable discharge capacity, such as a belt feeder or rotary feeder, may be used. , which receives a subtraction signal from the subtraction section 7 and discharges the material from the scale hopper 1 while continuously changing the discharge amount. 8 is the discharge machine 9
This controller amplifies the subtracted signal when it cannot be driven directly by the signal sent from the subtracting section 7, or drives the discharge machine by adjusting the subtracting signal and using the amplified value.

The present invention as described above stores the weight signal VLW from the load cell at that time when discharge starts when the weight of the material in the scale hopper 1 is W as shown in FIG.
A target function Vm of a negative slope equal to the setting rate shown in FIG. 2 of the setting device 5 shown in FIG. As described above, the subtraction from the target function Vm is given to the ejector control section, and the ejector 9 is driven by the value of "Ve-Vm".

The system is balanced when the slope of the target function Vm and the weight signal Ve from the load cell become equal, and the discharge machine quantitatively discharges the same amount as the set value. That is, during quantitative dispensing, if the power supply voltage suddenly drops and the capacity of the discharging machine decreases as shown in Figure 3, or if the power supply voltage suddenly increases and the capacity of the discharging machine increases and the capacity of the discharging machine increases and In the case shown in the figure, or when the so-called physical properties of the material being handled change, such as particle size, specific gravity, moisture content, etc., the capacity of the discharger changes and disturbances occur as shown in Figures 3 and 4. When the discharge rate of the discharge machine decreases, the value of "Ve-Vm" increases as shown by the two-dot chain line in Fig. 3, which works to increase the discharge rate of the discharge machine, and conversely, the above-mentioned disturbance enters and the emission rate increases, as shown by the two-dot chain line in Figure 4,
It acts so that the value of "Ve-Vm" decreases. FIG. 1 shows an example in which an electromagnetic feeder is used in a scale hopper and discharger using a load cell combined with horizontal stripes, but the control section is of an analog type.

Further, FIG. 7 shows an embodiment of the present invention using a Roberval-type Enoki Azusa and a load cell, and 1 is a scale hopper, which is similar to the present invention shown in FIGS. 1 and 6. This is to temporarily stock the materials input from the process before the quantitative discharge device and to be able to detect the weight of the stocked material. 2 is a tension type load cell that measures the weight of the material in the scale hopper. It is for converting into electrical signals. Reference numeral 9 uses an electromagnetic feeder as a discharging machine, which receives a signal from the control section 4 and applies vibration to the trough to discharge the material.

That is, the above-mentioned Roberval type cypress supports the scale hopper and the discharger, and also transmits the weight of the material to the load cell. Also, 10 is an oil damper,
This is for attenuating the shock applied to the weighing machine from the outside, and like the load cell 2 described above, it is used in general weighing machines. Reference numerals 11 and 12 are Roberval-style cypress trees, and 13 is the fulcrum of the Roberval.

According to the present invention as described above, since all of its basic functions and operations are electronic, high precision and high reliability can be obtained. In addition, since weight detection is performed using a load cell, it is relatively easy to manufacture sizes ranging from small to extra large, as needed. Since a weight feeding mechanism is not required, various effects such as simplification of the mechanism can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the outline of the present invention, FIG. 2 is a timing chart showing the relationship between the weight signal of the present invention and the target function, and FIG. 3 is a change in the weight signal due to disturbance of the present invention (
FIG. 4 is a timing chart showing the change (decrease) in the weight signal due to disturbance according to the present invention. FIG. 5 is a block diagram showing the case where the present invention is configured with a digital circuit. FIG. 7 is a flock diagram showing an overall outline of the present invention, and FIG. 7 is a front view showing an example of the scale hopper section of the present invention. DESCRIPTION OF SYMBOLS 1... Scale hopper, 2... Load cell, 3... Load cell amplifier, 4... Control part, 5... Setting part, 6... Target function generation part, 7... Subtraction part, 8... Discharge machine controller,
9 discharge machine. Tsutomu 1, 2, 3, 4, younger brother's figure, 6th customer, 7th figure

Claims (1)

[Scope of Claims] 1. A scale hopper equipped with a discharger is equipped with a means for electrically detecting the weight of the material, while a scale hopper equipped with a discharger is equipped with a means for electrically detecting the weight of the material, while the scale hopper is equipped with a means for electrically detecting the weight of the material. A target function generating unit is provided that generates a time function of an electrical signal corresponding to a material reduction curve as a target function,
The electrically detected signal corresponding to the weight of the material in the hopper is subtracted from the target function, the hopper discharger is driven by the subtracted value, and the material can be discharged in a fixed amount. Characteristic hopper quantitative discharge device. 2. The hopper quantitative discharge device according to claim 1, wherein the discharge machine is an electromagnetic feeder, a belt feeder, a rotary feeder, or the like whose discharge capacity can be varied. 3. A patent claim characterized in that the means for detecting the weight of the material in the scale hopper is a strain gauge type load cell, a magnetostrictive type load cell, a differential transformer, etc. that can convert the weight into an electrical signal. The hopper quantitative discharge device according to item 1.