JPS6023712Y2 - Bag filling weighing device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a bag filling and weighing device used, for example, when filling a fixed amount of powder or granular material into a flexible container bag.

Recently, powdered materials such as food raw materials, feed, fertilizers, etc. are often packed in predetermined amounts into flexible container bags (hereinafter referred to as flexible container bags) and shipped from factories.

A weighing device for this purpose is, for example, as shown in FIG.
The object to be weighed supplied from the supply duct 1 is transferred to the load cell 2.
It is suspended through.

The weighing hopper 3 is used to weigh and feed into the flexible container pack 5 conveyed by the roller conveyor 4 via the discharge chute 6.

A gate 8 that is opened and closed by a cylinder 7 is provided at the bottom of the weighing hopper 3, and the gate 8 is controlled based on a load signal from the load cell 2, and a predetermined amount of the object to be weighed is put into the flexible container pack 5. .

Note that the discharge chute 6 is supported by a support (not shown), etc., and reference numeral 9 denotes a hanger for the flexible container pack, 10 denotes a hook provided on the discharge chute 6 for suspending the flexible container pack 5 by the hanger 9, and 11 1 shows a pallet on which flexible container packs 5 are placed and moved on a roller conveyor 4.

However, this device has the problem that the equipment including the weighing hopper 3 is large-scale and expensive, requires a large equipment space, and is difficult to install in an existing building with a low roof.

Furthermore, the object to be weighed has to stop twice at the weighing hopper 3 and the flexible container pack 5, and especially when the object to be weighed is powder or granular material, the frequency of dust generation increases, and the large size of the dust collection blower increases. need something.

The device shown in FIG. 2 shows another conventional embodiment, in which a flexible container pack 5 transported by a roller conveyor 4 is suspended by a hook 13 of a support mechanism 12, and an object to be weighed is removed from a supply duct 1. This is to be put into the flexible container pack 5.

Roller conveyor 4' on which the pallet 11 is placed during weighing
is mechanically separated from the roller conveyor 4 in one flow process for weighing, and is weighed together with the reflex pack 5, support mechanism 12, and pallet 11 by a weighing machine 14.

After erasing these tares on the electric lock, the objects to be weighed placed into the flexible container pack 5 are weighed by the weighing machine 14,
When the predetermined amount is reached, the supply damper 1 is
6 is closed to stop feeding.

In this case, the equipment cost is slightly lower than in the previous example, but it is necessary to completely separate the roller conveyor 4' from other roller conveyors 4, and the roller conveyor 4' itself requires a driving device.

In addition, other mechanical tares are considerably heavier than the object to be weighed, and the weighing machine 14 must be made large, making it difficult to maintain weighing accuracy.

The purpose of the present invention is to eliminate all the drawbacks of the conventional devices mentioned above, and to provide a bag filling device that can accurately weigh objects to be weighed in a bag with a simple device. an upper lifting frame that is suspended by a lifting mechanism and is raised and lowered by a lifting mechanism; a lower lifting frame that has a hook at the bottom for hanging the bag and is placed below the upper lifting frame; an upper lifting frame and a lower lifting frame; A plurality of tension type load cells are inserted between the two to suspend the lower lifting frame, and a supply tube is vertically installed through the center of the upper lifting frame and the lower lifting frame to load the object to be weighed into the bag body. , a supply damper that operates the supply damper via a drive mechanism to allow the object to be measured to pass through and cut off the supply tube, and an electric circuit that processes electrical signals from the load cell and operates the drive mechanism of the supply damper. It is characterized by:

The present invention will be explained in detail based on the embodiment shown in FIGS. 2 and 3.

In the drawing, reference numeral 20 indicates four pillars that are planted from the ground near the roller conveyor 4, and the upper portions thereof are covered by a top plate 21 located above the roller conveyor 4.

Four pulleys 22 are arranged on the top plate 21, and an upper elevating frame 25 having a space in the center is connected via four ropes 24 wound around a winding drum 23 installed on one of the pillars 21. It is suspended.

A lower lifting frame of the same type is arranged below the upper lifting frame 25, and these are connected by four tension type load cells 27.

Further, a hook 28 for hanging the flexible container pack 5 is provided at the lower part of the lower lifting frame 26.

A supply cylinder 29 for feeding objects to be weighed into the flexible container pack 5 extends downward from the top plate 21 through the center of the lifting frames 25 and 26, and a bellows 30 is used for a part of the supply cylinder 29. .

A portion of the supply cylinder 29 may be fixed to the upper elevating frame 26, and the lower end of the supply cylinder 29 may be moved up and down together with the upper elevating frame 26 by utilizing the expansion and contraction of the bellows 30.

A supply duct 31 is provided above the supply tube 29 for introducing the object to be weighed into the supply tube 29, and a supply damper 32 for passing and blocking the object to be weighed is provided inside the duct 31, and the supply damper 32 is provided inside the duct 31 for introducing the object to be weighed into the supply tube 29. 33.

Further, 34 is an electric motor for rotating the winding drum 23;
35 indicates an air supply pipe for blowing air into the flexible container pack 5.

Further, the output electric signals from the four load cells 27 are added by an adder 36 provided on the upper lifting frame 25, and the load is digitally displayed on the display section 38 via the operational amplifier 37, and the load is displayed digitally on the display section 38. When the flexible container pack 5 is filled with objects to be weighed until the set value set by the setting circuit 39 is reached, a signal is transmitted from the control circuit 40 to the cylinder 33 to close the supply damper 32.

The embodiment according to the present invention has the above-mentioned structure, and its operation will be explained. First, the flexible container pack 5 placed on the pallet 11 is conveyed to the lower part of the supply cylinder 29 by the roller conveyor 4.

Thereupon, the electric motor 34 is driven to loosen the winding drum 23, the upper lifting frame 25 and the lower lifting frame 26 are lowered to the position shown by the dashed line in FIG. The lifting frames 25 and 26 are raised again to the position shown by the solid line in FIG.

In this raised position, or in the lowered position if configured to descend together with the supply cylinder 29, the supply cylinder 2
9 is inserted into the entrance of the flexible container pack 5 without transmitting any vertical force.

In this state, the load applied to the load cell 27 is the tare of the flexible container pack 5, the lower lifting frame 26, and the hook 28, and these are tared and automatically zero-adjusted in the arithmetic amplifier 37. Only the load of the object to be weighed placed into the pack 5 is measured.

Next, in order to sufficiently increase the volume of the folded flexible compact pack 5, air is blown into the flexible compact pack 5 from the air supply pipe 35 to sufficiently inflate the flexible compact pack 5, and the excess air is removed from the supply pipe. It is assumed that the air is discharged from a gap between 29 and the inlet of the flexible container pack 5, or from a specially provided air vent (not shown).

Therefore, the supply damper 32 is opened via the cylinder 33,
The object to be weighed is passed through the supply cylinder 29 from the supply duct 31 and placed into the flexible container pack 5.

When the weighed value reaches the set value, the supply damper 32 is closed by a signal from the control circuit 40, and a predetermined amount of the object to be weighed or the flexible container pack 5 is filled.

Then, the elevating frames 25 and 26 are lowered again to place the flexible container pack 5 on the pallet 11, the hanger 9 is removed from the fleck 28, and the flexible container pack 5 is conveyed by the roller conveyor 4.

By repeating this series of operations for successive flexible container packs 5, it becomes possible to pack them into bags efficiently.

In addition, since a weighing hopper is not required and the objects to be weighed directly placed into the flexible container pack 5 can be measured using two lifting frames 25 and 26 with a load cell 27 inserted between them, dust generation is also avoided. The equipment space is small, and the equipment cost is relatively low.

Furthermore, since the weight of the tare other than the object to be weighed suspended by the load cell 27 is small, the load capacity of the load cell 27 can be reduced, and accuracy can also be improved.

If a bag, such as the flexible container pack 5, does not come with a hanger 9, you can use a special storage device with a hanger for hanging the bag in the same way as the flexible container pack 5 with the handle 9. Can be packed in bags.

Note that the lower end of the supply tube 29 can also be weighed together with the flexible container pack.

However, in this case, the bellows 30 must be sufficiently soft and must be insulated by the upper and lower force transmission force rings 130.

[Brief explanation of the drawing]

1A and 1B are explanatory diagrams of a conventional bag filling and weighing device, and FIG. 2 and the following show an embodiment of the bag filling and weighing machine according to the present invention. The figures are a perspective view and an electrical block circuit diagram of the elevating frame. Reference numeral 4 is a roller conveyor, 5 is a flexible container pack, 9 is a hanger, 20 is a support, 22 is a pulley, 23 is a winding drum, 24
is the rope, 25 is the upper lifting frame, 26 is the lower lifting frame, 27
28 is a load cell, 28 is a hook, 29 is a supply cylinder, 31 is a supply duct, 32 is a supply damper, 33 is a cylinder, and 34 is an electric motor.

Claims (1)

[Scope of utility model registration request] An upper lifting frame that is suspended via a column and raised and lowered by a lifting mechanism, a lower lifting frame that has a hook at the bottom for hanging the bag and is placed below the upper lifting frame, and an upper lifting frame and a lower lifting frame. A plurality of tension-type load cells are inserted between the lifting frame and suspend the lower lifting frame, and are installed vertically through the center of the upper lifting frame and the lower lifting frame for loading objects to be weighed into the bag. a supply cylinder, a supply duct that operates a supply damper via a drive mechanism to allow the object to be measured to pass through and cut off the supply cylinder, and an electric circuit that processes electrical signals from the load cell and operates the drive mechanism of the supply damper. A bag filling and weighing device comprising: