JPS5817228Y2 - Hopper scale for weighing the amount received - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a hopper scale for measuring the total weight of received objects.

Conventionally, a hopper scale for weighing received quantities consists of a feeder that controls the discharge of received objects to be weighed, and a weighing object weighing hopper (hereinafter referred to as a weighing hopper) to which the objects to be weighed are supplied from the feeder. The supply of the object to be weighed to the weighing hopper is switched from a large supply to a small supply before a predetermined set weight, and the weight of the weighing hopper is almost accurately weighed once, and the weight of the weighing hopper is The frequency meter is driven each time an object to be weighed is discharged, and the total weight of the received objects is measured by multiplying the count value of the frequency meter and the set weight value.

Since the feeding speed of the object to be weighed is switched between large feeding and small feeding, weighing takes time, and the total weight is calculated by multiplying the count value of the frequency meter and the set weight value, so the measured value is It was inaccurate.

The present invention was devised in view of the above-mentioned drawbacks, and it is an object of the present invention to provide a hopper scale for weighing received quantities that is accurate in weighing and has a fast weighing speed.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

1 is a supply hopper for objects to be weighed (hereinafter referred to as supply hopper)
Then, by opening the gate 2 provided at the bottom, the received object to be weighed 3 is supplied to the weighing hopper 4.

5 and 6 are gate drive control units, each of which controls the supply hopper 1.
, controls the opening and closing of the bottom gate 2°T of the weighing hopper 4.

8 is a load cell which outputs a DC voltage corresponding to the weight value of the object to be weighed supplied to the weighing dropper.

Reference numeral 9 denotes an automatic control section, which is composed of a weight setting device 10, a coincidence detector 11, and a near-zero detection section 12. The coincidence detector 11 includes a preamplifier 13 which amplifies the output voltage of the load cell 8 and outputs it.
When the output voltage matches the output voltage of the weight setter 10 corresponding to a preset weight value, a supply completion signal HP of logic level "H" is output.

The supply completion signal HF instructs the gate drive control section 5 of the supply hopper 1 to close the gate 2, and the supply completion signal HF is sent to the gate drive control section 6 of the weighing hopper 4 via the delay circuit 14. command to open gate 7.

Further, the near-zero detection section 12 determines that discharging is complete when the output voltage of the load cell 8 reaches a voltage value corresponding to the weight of the object to be weighed "zero", and causes the gate drive control section 6 of the weighing hopper 4 to control the gate 7. A command is given to close the gate 2, and a command is given to the gate drive control section 5 of the supply hopper 1 to open the gate 2.

In addition, 15 is a measurement start switch, which turns on/off the output of the output signal of the near-zero detecting section 12.

Reference numeral 16 denotes a weighing end switch, which outputs a logic level "H" signal when on, and commands the gate drive control unit 6 of the weighing hopper 4 to open the gate 7 via the inverter 17.

A weight display section 18 displays the output voltage of the preamplifier 13 as a weight value corresponding to the output voltage.

19.20 is an adder, and the adder 19 adds the weight value of the object to be weighed in the weighing hopper 4 immediately before being discharged when the addition is commanded by the supply completion signal HF of the automatic control unit 9, and also adds the weight value of the object to be weighed in the weighing hopper 4 immediately before discharging. Output.

The other adder 20 adds the contents of the adder 19 and outputs the contents when instructed by the output signal of the metering end switch 16 via the delay circuit 21.

Reference numeral 22 denotes an accumulation display section which inputs the output signal of the adder 19 and displays the contents of the adder 19 as a corresponding weight value.

23 is a total display section which inputs the output signal of the adder 20 and displays the contents of the adder 20 as a corresponding weight value.

Note that 24 and 25 are reset switches that clear the contents of adders 19 and 20, respectively.

Next, the operation will be explained.

First, based on the capacity of the weighing hopper 4, the weight value of the object to be weighed at one time of the weighing hopper 4 is set in the weight setting device 10.

Furthermore, when the metering start switch 15 is turned on, the output signal of the near-zero detection section 12 is input to the gate drive control section 6.5, the gate 7 is closed, the gate 2 is opened, and the supply hopper 1 is transferred to the weighing hopper 4. Start discharging the object to be weighed 3.

When the weight of the object to be weighed supplied to the weighing hopper 4 matches the weight value set in the weight setting device 10, the -number output circuit 11
outputs one supply completion signal HF, and the supply hopper 1 stops discharging the object to be weighed.

Furthermore, since the supply completion signal HF is input to the gate drive control unit 6 via the delay circuit 14, the weighing hopper 4 discharges the object to be weighed after the delay time of the delay circuit 14 after the supply hopper 1 stops discharging. Start.

Simultaneously with the command to discharge the weighing hopper 4, the adder 19 adds the weight value of the object to be weighed immediately before discharging the weighing hopper 4,
The cumulative display section 22 displays the amount discharged from the weighing hopper 4 since the start of weighing.

When the discharge of the weighing hopper 4 is completed, the near-zero detection unit 12
The output signal closes the gate 7 of the weighing hopper 4 and opens the gate 2 of the supply hopper 1 again, so that the weighing hopper 4 repeats weighing.

Each time, in response to the supply completion signal HF, the adder 19 repeats the addition of the weight value immediately before being discharged from the weighing hopper 4.

In the final weighing of the accepted object to be weighed 3, if the weight of the object supplied to the weighing hopper 4 is less than the weight setter 10, turning on the weighing end switch 16 will cause the weighing object in the weighing hopper 4 to be weighed. Maybe the weight of the object to be weighed is less than the set weight?
Regardless, the discharge command is output, and the adder 19 receives the addition command, and the content of the preamplifier 13 output signal corresponding to the weight value in the weighing hopper 4 at that time is added, and the cumulative display section 22 supplies the output signal. The weight value of the object to be weighed received in hopper 1 is displayed.

Further, the adder 20 is commanded to add the output signal of the weighing end switch 16 by the signal via the delay circuit 21, adds the output signal of the adder 19, and the total display section 23 displays the weight value of the objects to be weighed that have been received up to the previous time. Displays the total weight value of the weight of the object to be weighed that was received this time.

As explained above, according to the present invention, there is an adder that is commanded by a supply completion signal to the weighing hopper and accumulates the contents of the load converter immediately before discharge, and an accumulation display section that displays the adder output signal as a weight value. Even if the amount of objects to be weighed to be fed to the weighing hopper is not accurate every day, the cumulative display section will display the added value of the weight just before discharging from the weighing hopper. Even with feed only, metering of the total amount received multiple times in the receiving needle heavy hopper is quick and accurate.

[Brief explanation of the drawing]

The drawing shows a block diagram of an embodiment of the hopper scale for receiving and placing needles according to the present invention. 1... Hopper for supplying objects to be weighed 4...
Weighing object to be weighed hopper, 8-...Load cell, 1
9, 20... Adder, 22... Cumulative display section, 23... Total display section.

Claims (1)

[Scope of utility model registration request] a feeder that supplies the object to be weighed to the receiving quantity weighing hopper;
A load converter that outputs a weighing signal corresponding to the weight value of the object to be weighed supplied to the receiving weighing hopper, a set weight value signal set for the weighing signal output from the load converter, and the weighing signal. When the weighing signal matches the set weight value signal, a signal to complete the supply of the object to be weighed once to the receiving amount weighing hopper is output, and the feeder is commanded to stop discharging the object to be weighed, and at the same time, the receiving amount is determined. A discharge command is output to the weighing hopper, and when it detects that the discharge of the receiving quantity weighing hopper is completed, the receiving quantity weighing hopper is commanded to stop discharging, and the above-mentioned feeder is sent to the receiving quantity weighing hopper. □ an automatic control unit that commands the resumption of supply of the object to be weighed; an adder that accumulates the contents of the output signal of the load converter immediately before discharge from the receiving volume weighing hopper every time the supply completion signal of the automatic control unit is generated; 1. A hopper scale for weighing a received amount, comprising an accumulation display section that displays an adder output signal as a weight value.