JPS62137525A - Automatic weighing machine for grain - Google Patents

Abstract

PURPOSE:To make the capacity of a tank variable versatily with only one tank while achieving a high efficiency of automatic weighing, by a method wherein a cylinder of a rectangular tube type square weighing hopper is provided with a horizontally movable partition to make the capacity in the chamber variable while a small hot receiving tank at a fixed height position near upper rim in a weighing tray. CONSTITUTION:A square weighing hopper 5 is provided with a partition 6 to divide the inside of a square tube body into two chambers (a) and (b) To change the capacity of a square weighing hopper 5, a stepping motor 7 is driven to vary the capacity in the chamber (a) by moving the partition 6 horizontally. Grains in a hopper 1 are supplied with the time setting of a gate 1, estimating the time when the chamber (a) is filled to the full capacity, and the grains in the chamber (a) are dumped into a weighing tray 23 down. Small lot receiving tank 26 is provided at a fixed height position in a weighing tray 23 and regardless of weighed value, an weighing object for addition is stored into the small hot receiving tank 26. Moreover, the bottom plate 26a of the receiving tank 26 is opened in relation to a gate 25 for a weighing tray 23.

Description

[Detailed description of the invention] The present invention relates to an automatic needle JJK machine for powder and granular materials.

Conventionally, automatic weighing machines for dispensing fillers such as powder or granules have used large and small scales as discharge means, and the former has several so-called large tanks, which are rotated as appropriate. On the other hand, for the latter, a system such as that disclosed in Japanese Utility Model Publication No. 13713/1983 is generally used, in which the deficiency is supplemented by an electromagnetic feeder or the like.

By the way, with this type, if the metering capacity changes, it is necessary to change the tank itself, and it is also necessary to prepare a large number of tanks.In addition, the insufficient supply from the electromagnetic feeder is handled by metering as shown in Figure 5. The magnitude of the measured value in tank 11 (A
), the falling distance differs depending on the small O as L2 > Ll, so the supply amount at the same time will be large for the former, but small for the latter, causing troublesome measurement errors. ing.

The present invention aims to solve the above problems,
That is, in the present invention, instead of preparing a large number of tanks for bulk supply, a single tank can be used to change its volume in various ways, and an electromagnetic feeder is installed at the upper rear of the measuring tank. A dispensing tank is installed to temporarily store dispensing input, and the bottom plate of the dispensing tank has a total of Jl! It is characterized by being designed to open in relation to the bottom plate of HjTj.

Hereinafter, an example of the New Year's Eve of the present invention will be described based on the drawings.

FIG. 1 is a longitudinal cross-sectional view of the entire apparatus, in which 1 is a supply hopper, 2 is a gate for opening and closing the same, 3 and 4 are fluid cylinders and pistons for opening and closing the gate, 5 are
3. Valve needle for large bulk supply placed below the gate 1. <It's a hopper. As shown, the valve needle 1t hopper 5 has a rectangular cylindrical body with a constant length in the direction of erosion, and the inside is provided with a partition plate 6 to partition the length direction into two chambers a and b. can be moved horizontally by a stepping motor 7 from the outside. In terms of the enclosure, as shown in FIG. 2 (a partial plan view taken along the line X-X in FIG. 1), the partition plate 6 consists of two parallel support rods 8a and 8b that pass through the rear part of the valve needle amount hopper 5. Each support rod 8a, 8b is supported by a bearing holder 10, 10 suspended from the frame 9 of the device outside the valve needle amount hopper 5.
It is slidably held via bearings 11 and 111 of 1. The other ends of the support rods 8a and 8b are connected by a bridging plate 13 having a screw hole 12 bored in the center thereof, and the screw hole 12 has a screw shaft connected to the output shaft of the stepping motor 7. 14 are not screwed together, the partition wall plate 6 is moved back and forth in the directions of arrows (a) and (b) by clockwise or counterclockwise rotation of the screw shaft 14.

Reference numeral 15 denotes an auxiliary plate to prevent the powder from falling into the chamber from the supply hopper 1 when the volume inside the tank is changed by moving the bulkhead plate 6 back and forth, and its upper end is attached to the rotating shaft 16. The lower end is attached to the partition wall plate 6.
It is placed in a slidable manner on the upper edge of the.

Reference numerals 17a and 17'b are a pair of left and right opening/closing gates, which are normally closed, but in order to open them, fluid cylinders 18a and 18b (only one shown), which are suspended in the device frame, are required.
The same applies hereafter) and the bearing 19a (1
This is done by lifting the swinging lever 2Ua (20b) which is pivotally supported by the pivot lever 2Ua (20b) at a fixed angle. In addition, 22 is the above-mentioned opening/closing gate 17
a, 171) with the auxiliary cover placed outside.

Reference numeral 23 denotes a weighing pan provided at the lowest stage, and the weight detection device 2
4, and the lower part has an opening/closing game I.25.
is provided to detect the constant J1 of the powder and granular material, and to detect the gate 2 which was blocked by the detection means at that time.
5 is opened (the 1° 4 configuration is different from the conventional one, but t
However, in the present invention, a third
The dispensing tank 26 as shown in the figure is one container. The dispensing tank 26 is movable via a shaft 27, and normally a reservoir is formed by pressing the bottom plate 26a in the direction of the arrow e1 via a crank lever 28 attached to the side wall surface. , by reverse operation of the crank lever 28, the interior is opened by rotating in the direction of the arrow.

At this time, the operation of the crank lever 28 is performed in conjunction with the opening/closing operation of the gate 25. That is, when the gate 25 is closed, the bottom plate 26a is also closed, and the gate 25 is opened. At the same time, the bottom plate 26
a is also opened. Note that the upper end p of the bottom plate 26a is located inside the tank and lower than the upper end g of the tank.

Reference numeral 29 denotes an electromagnetic feeder for supplying powder and granular material to the above-mentioned dispensing tank, and the powder and granular material flows down to the electromagnetic feeder 29 from a distribution pipe 30 branched from the bottom of the supply hopper 1. 31 is the layer thickness: To change the volume of the circumference 5, the stepping motor 7 is appropriately rotated to move the partition plate 6 in the directions of arrows (a) and (b). Furthermore, in the present invention, the dispensed amount is always stored at a constant height within the measuring pan, regardless of changes in volume.

Next, to explain step i4 of the weighing method, a detected weight (total jl'LL weight) is set in the initial weight detection device. A load cell is used to detect this weight 11, and the setting of the detection vehicle J1℃ is performed by remote control using a decile setting device.On the other hand, the supply J1''C by the weighing hopper is slightly lower than the detection weight J11. Adjust to a smaller amount. For this purpose, the stepping motor 7 is activated by a remote control key, and the partition plate 6 is moved appropriately.

Activate the fluid cylinder 3 in the above step and feed the hopper 1.
The powder and granular material in the hopper 1 flows through the valve needle into the chamber a of the hopper 5 and fills the chamber. It is closed by the pre-+l1lIL time setting, or by the operation of the 1【entered the room!♂】detection means.

Next, the gates 17a and 17b of the valve needle amount hopper 5 are opened by operating the fluid cylinders 18a and 18b.
The powder and granular material in the chamber a is put into the lower measuring pan 23. At this time, gate 18a.

18b predicts the time when the injection will be completed and is closed by the time setting. On the other hand, the powder and granular material is sent from the supply hopper 1 to the direct magnetic feeder 29 via the distribution pipe 30, and by raising and lowering the layer thickness adjustment gate 31 as appropriate, the shortage of the bulk supply by the chamber a is transferred to the electromagnetic feeder 29. 29, it is sent into the dispenser receiving tank 26. However, when the insufficient supply reaches the measured value installed in the weight detection device 24, the operation of the electromagnetic feeder 29 is stopped, and the gate 25 of the weighing pan 23 moves in the direction of the arrow (E). It is opened and the weighed powder is discharged into a package (not shown).

The bottom plate 26a of this small dispensing tank is also opened at the same time, and accurately measured values can be dispensed.

The above is one step, but regarding bulk supply, during the supply by the electromagnetic feeder 29, the following total details G; 71. , ;
n: (No change in content) The charging of the quantity reservoir from the supply hopper has been completed, so the next metering operation will begin with the opening of the gates 17a and 17't+ in the valve needle quantity hopper 5.

In the present invention, during the repeated operation of the above operation, the electromagnetic feeder 29
The supply time is automatically measured, and if the set range is exceeded, the volume of the chamber a where the valve needle amount z<-5 is automatically adjusted by operating the stepping sweater 7. be.

As described above, the device of the present invention enables highly efficient automatic metering with a relatively simple groove configuration. On the other hand, if the object to be weighed falls into the weighing pan under normal conditions, the new character that fell will result in an error, and this error constantly changes depending on the height of the fall, and also varies depending on the particle size, viscosity, specific gravity, etc. of the object to be weighed. However, in the present invention, a dispensing receiving tank 26 is provided at a constant height position within the weighing pan 23, and the weighing object for addition is transferred to the 2tf regardless of the size of the measured value.
126, the above-mentioned cause of error is eliminated and measurement with excellent accuracy is possible. In addition, this is to prevent the upper end p of the bottom plate 26a of the nuclide from spilling from the upper end p and falling outside the machine when a large amount of the supply from the tank top magnetic feeder 29 of the weighing pan 23 drops. be.

[Brief explanation of drawings]

Figure l111 with gap shows an example of the 5A cannon of the present invention, and is the first
The drawings show a longitudinal section 4'1 of the entire device, and FIG. 2 and FIG. 15 show the feeding state of a conventional example. 1... Supply hopper 2... Opening/closing game 1-
3... Fluid cylinder 5... Valve needle amount hopper 6... Partition plate 7... Stepping motor 1O110'... Bearing holder 13.
・・Bridge plate 14 - Screw @ 15 ・
・, Auxiliary plate 16 ... Rotation shaft 17a,
17b... Opening/closing gates 20a, 20b... Rocking lever 22... Auxiliary cover 23... Weighing pan
24...Weight detection device 25...Opening/closing gate 26...Dispensing tank 29...°Intuitive feeder 300.・Distribution piping patent applicant: Toyo Jidoki Co., Ltd. Agent: Patent attorney: Hiroshi Kuma, Minoru Yi ■ Figure 4A Procedural Amendment Statement March 6, 1986

Claims (1)

[Claims] (1) The weighing hopper, which feeds a volume slightly less than the detected weight into the weighing pan, is made into a rectangular cylindrical body and is arranged vertically, and the inside of the cylindrical body in the height direction is divided into two chambers. In addition to providing a bulkhead plate in the weighing pan, the bulkhead plate can be moved horizontally to change the interior volume of the chamber, and an electromagnetic feeder is installed at a certain height near the upper edge of the weighing pan to make up for the shortage. 1. An automatic weighing machine for powder and granular material, characterized in that a dispensing tank is provided for storing powder and granular material, and the bottom plate of the tank is configured to be opened together with a gate of a weighing pan.