JPH0226038Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a weighing device.

Conventionally, for example, when mixing several types of powder or raw materials such as powder in predetermined amounts and producing products through predetermined processing steps, the raw materials were stored in transportation containers and brought into the factory, and were separated by type. It was necessary to perform a step of once charging the entire amount into a weighing hopper, and then charging a predetermined amount of each raw material from the weighing hopper into a separate container. However, in this conventional method, the raw materials in the transport container must be placed in a weighing hopper, and then a predetermined amount of raw materials must be received from each weighing hopper in a separate container, which is very cumbersome and difficult. Ta.

Therefore, the inventors of this invention placed the transport container itself on a transport line in the factory, supplied a predetermined amount of raw materials directly from the transport container to a kneading machine, etc., and automatically cleaned the empty transport container. We have developed a circulation system that can be used appropriately for transporting raw materials or mixed raw materials. Such a system requires a weighing device that can discharge the raw material while weighing the raw material in each transportation container.

In view of the above points, an object of the present invention is to provide a weighing device that can discharge the raw material inside the transport container while weighing the transport container in which the raw material is stored.

In order to achieve the above object, the weighing device of the present invention includes a weighing device main body on which a transportation container having an openable and closable discharge port on the bottom is placed and weighing the weight, a discharge hole penetrating vertically through the weighing device; a double-tube guide body fixed on the weighing device body concentrically with the discharge hole; The structure includes a cylindrical elevating body that is fitted and connects the discharge port of the transport container and the inner cylinder of the guide body at the upper limit position thereof, and a drive means that drives the elevating body up and down. .

According to this configuration, by placing the transport container on the weighing device main body and raising the elevating body, the discharge port of the transport container and the discharge hole of the weighing device main body are communicated by the elevating body and the guide body. This allows you to weigh the raw materials in the transport container while weighing them.
It can be discharged reliably without scattering onto the weighing device body.

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

In Figures 1 and 2, 1 is a weighing device, 2
1 is a transportation container, and a rectangular plate-shaped weighing device main body 3 of the weighing device 1 is formed with a discharge hole 4 having a circular cross section and passing through the center thereof in the vertical direction. Further, the discharge hole 4 is provided on the upper surface of the weighing device main body 3.
A raw material guiding device 5 is installed which is concentric with and has approximately the same diameter as the transport container 2, and a regulating member 7 having a substantially L-shape in plan view that opposes the legs 6 of the transport container 2 and regulates the position of the transport container 2. A protrusion is provided at each corner. A discharge port 8 for discharging raw materials is formed in the center of the lower surface of the transport container 2, and a short pipe 10 equipped with a butterfly valve 9 for opening and closing the discharge port 8 is fixed. Further, inside the transport container 2, an inclined wall 11 for guiding the raw material to the discharge port 8 is fixed, and a pair of screw augers 12 for smoothly discharging the raw material from the discharge port 8. is installed. Furthermore, a removable lid 13 is installed in the center of the upper surface of the transport container 2, and in consideration of stacking the transport containers 2 in multiple stages, the legs 6 on the lower surface of the upper transport container are positioned. A regulating body 14 having a substantially L-shape in plan view
are protruding from each corner. 15 is a screw feeder for feeding raw materials into a kneading machine, etc. (not shown), and a main body casing 1 covers a screw 16.
A cylindrical inlet side casing 18 connected to one end of the screw feeder 15 passes through the discharge hole 4 and has an upper lid fixed to the upper surface of the weighing device main body 3, so that the load of the screw feeder 15 can be measured. This becomes a load on the heavy equipment main body 3. The lower end of the outlet side casing 19 connected to the other end of the main body casing 17 is connected to, for example, a kneader (not shown).

FIG. 3 is an enlarged sectional view of the raw material guide device 5,
Reference numeral 20 denotes a double cylindrical guide body fixedly installed on the upper surface of the weighing device main body 3 with bolts or the like, and includes an inner cylinder 20a.
and an outer cylinder 20b. Reference numeral 21 denotes a cylindrical elevating body that is slidably fitted into the gap between the inner cylinder 20a and the outer cylinder 20b of the guide body 20. The inner cylinder 20a and the outer cylinder 20b are connected to each other at their lower ends by screw fitting, and an annular seal member 23 is interposed between them. 2
Reference numerals 4 and 25 indicate annular sealing members 2 mounted in recesses in the outer circumferential surfaces of the upper ends of the inner cylinder 20a and the outer cylinder 20b;
Reference numeral 6 denotes an annular sealing member attached to a recess on the inner circumferential surface of the elevating body 21, 27 an annular sliding member attached to a recess on the inner circumferential surface of the elevating body 21, and 28, the elevating body 2.
1. This is an annular sealing member mounted in a recess on the outer circumferential surface of the lower end. Helical springs 29 are installed at appropriate intervals in the circumferential direction between the annular protrusion 20c on the inner peripheral surface of the upper end of the outer cylinder 20b and the annular protrusion 21a on the outer peripheral surface of the axial center of the elevating body 21. An air hole 31 communicating with an annular space 30 in which the helical spring 29 is housed is formed in the upper part of the outer cylinder 20b. Further, an air supply/discharge hole 33 is formed in the middle part of the inner cylinder 20a in the thickness direction, and communicates with an annular space 32 surrounded by the inner cylinder 20a, the outer cylinder 20b, and the elevating body 21. An end of an air supply pipe (not shown) is screwed into the lower end of the air supply/discharge hole 33. Note that the helical spring 29 urges the elevating body 21 downward.

Next, the operation will be explained. First, the transport container 2 containing raw materials is placed on the weighing device main body 3. As a result, the weight of the transportation container 2 and the raw material inside it is weighed by the weighing device main body 3. This weighing means can use various conventionally known methods, and since it is not directly related to the gist of the present invention, its explanation will be omitted. Next, the elevating body 21 is raised as shown by the imaginary line in FIG. 3, so that the upper end of the elevating body 21 and the lower end of the short tube 10 are aligned. That is, when air is supplied to the annular space 32 from the air supply/discharge hole 33, the elevating body 21 rises against the biasing force of the helical spring 29 due to air pressure. At this time, the air in the annular space 30 flows through the air holes 31
is exhausted from. Next, when the butterfly valve 9 is opened,
The raw material in the transportation container 2 passes through the short pipe 10, the elevating body 21, and the inner cylinder 20a from the discharge port 8 to the discharge hole 4, and then from the discharge hole 4 to the screw feeder 1.
It enters the main body casing 17 through the inlet side casing 18 of No. 5. Then, it is transported by the screw feeder 15 and continuously supplied from the outlet side casing 19 to a kneading machine (not shown). Since the weighed value by the weighing device main body 3 continuously decreases according to the amount of discharged raw material, the discharged raw material can be determined by comparing it with the initial weighed value. Therefore, when the discharge amount reaches a predetermined amount, the screw feeder 1
5 and close the butterfly valve 9. After discharging a predetermined amount of raw material in this way, if the supply of air to the annular space 32 is stopped, the elevating body 21 is lowered by the biasing force of the helical spring 29.

In the above embodiment, the helical spring 29 is used to lower the elevating body 21, but the helical spring 29 is eliminated and the annular space 32 is closed when ascending.
Additionally, air may be supplied to each of the annular spaces 30 during the descent. Further, the driving means for the elevating body 21 is not limited to one that uses air as described above, but may also use one that uses a hydraulic cylinder device, an electric motor, or the like.

Further, in the above embodiment, the raw material was supplied to the kneading machine via the screw feeder 15, but the raw material was supplied directly from the weighing device main body 3 through a supply pipe or the like.
The raw material may be supplied to a kneader or the like.

As explained above, according to the present invention, the raw material in the transportation container can be reliably discharged without scattering onto the weighing device body while weighing.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a front view of a transport container placed on a weighing device, Fig. 2 is a side view of the same, and Fig. 3 is a transport container installed on the weighing device itself. FIG. 3 is a longitudinal sectional front view of the raw material guide device. 1... Weighing device, 2... Transport container, 3... Weighing device main body, 4... Discharge hole, 5... Raw material guide device,
8... Discharge port, 9... Butterfly valve, 20... Guide body, 20a... Inner cylinder, 20b... Outer cylinder, 21...
... Elevating body, 23-28 ... Seal member, 29 ...
Helical spring, 30, 32... annular space, 31...
Air hole, 33... Air supply and exhaust hole.

Claims (1)

[Scope of utility model registration request] A weighing device main body on which a transport container having an openable and closable discharge port is placed on the top surface to measure the weight of the container, a discharge hole vertically penetrating the weighing device main body, and the weighing device main body. A double-tube type guide is fixed on the top concentrically with the discharge hole, and the guide is slidably fitted between the double-tubes of the guide to discharge the transport container at its upper limit position. A weighing device comprising: a cylindrical elevating body that communicates an outlet with an inner cylinder of the guide; and a drive means for driving the elevating body up and down.