JPH0447627Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a measuring device for powder and granular materials, and is particularly suitable for molding a mixture of coarse particles with a diameter of 3 to 6 mm and fine powder, such as magnesia carbon bricks. The present invention relates to a measuring device that accurately measures required raw materials.

[Prior Art] Conventionally, as shown in FIG. 6, this type of weighing device has a thickness damper 5 disposed on the belt 1c of the belt feeder 1, and a cut damper 11 disposed near the downstream end of the belt 1c. When the amount of granular material 4 supplied to the weighing hopper 3 reaches an initial amount, for example, 90% of the preset amount, the layer thickness damper 5 is operated and the speed of the belt 1c is reduced to perform the weighing. The amount of powder or granule 4 supplied to the hopper 3 is set to a very small amount, and then, when the amount of powder or granule 4 supplied to the weighing hopper 3 reaches the measurement setting value, the cut damper 11 is operated to transfer the powder or granule to the weighing hopper 3. The amount of powder and granular material 4 supplied was completely zero.

[Problems to be solved] However, with conventional weighing devices, if the speed of the belt feeder is reduced too much, the efficiency will decrease and it is not practical. If the amount is less than about twice that of 1, powder and granules become clogged, resulting in the disadvantage that the work must be stopped frequently.

Moreover, in recent years, there has been a demand for higher quality products.
For example, it has become necessary to minimize tolerances in the thickness and density of refractory bricks.

[Means for solving problems] In order to solve the above-mentioned conventional problems, the present invention has the following features:
a belt feeder that conveys powder and granules from a supply hopper to a weighing hopper; a layer thickness damper that is arranged on the belt of the belt feeder and regulates the layer thickness of the powder and granules on the belt; and a layer thickness damper that is arranged near the downstream end of the belt. and a cut damper for blocking the falling of the powder or granular material from the downstream end of the belt to the weighing hopper, wherein the cut damper is arranged near the downstream end of the belt and It is arranged above the cut damper, and controls the falling of the powder or granule to the weighing hopper after the layer thickness of the powder or granule is adjusted by the layer thickness damper and before the fall of the powder or granule is blocked by the cut damper. The present invention provides a powder/granular material measuring device characterized by being equipped with a small amount damper.

[Example] Next, the present invention will be specifically described with reference to the accompanying drawings.

FIG. 1 is an explanatory diagram showing an embodiment of the powder/grain material measuring device of the present invention. FIG. 2 is an enlarged plan view of the same portion, and FIGS. 3 a, b, and c are enlarged perspective views of the same portion. FIGS. 4a, b, and c are explanatory diagrams of the same operation, and FIGS. 5a, b, and c are also explanatory diagrams of the same operation.

First, the configuration of the measuring device of the present invention will be explained in detail.

Reference numeral 1 denotes a belt feeder, which conveys and supplies powder and granular material 4 from a supply hopper 2 to a weighing hopper 3 by means of a belt 1c stretched between a driving roller 1a and a driven roller 1b. Guide plates 1d and 1e for regulating the transport width l of the powder and granular material 4 are arranged on both upper sides of the belt 1c. 5 is a layer thickness damper, which is arranged on the belt 1c,
When the amount of powder 4 supplied to the weighing hopper 2 reaches a predetermined amount, for example, 80% of the set weighing value, the shutter 5a is moved by the air cylinder 5b to the belt 1c.
The layer thickness of the granular material 4 on the extrusion belt 1c is limited to achieve this. If the speed of the belt 1c is reduced at the same time as the layer thickness is restricted by the shutter 5a, the amount conveyed to the weighing hopper 3 by the belt 1c can be conversely restricted. Reference numeral 6 denotes a small quantity damper, which is disposed at the downstream end of the belt 1c, and is configured to cause a shock when the amount of powder 4 supplied to the weighing hopper 3 reaches another predetermined amount, for example, 95 to 97% of the set weighing value. 6a is rotated around a pivot shaft 7 by an air cylinder 6b and pushed out toward the downstream end of the belt 1c, and the amount of powder and granular material 4 falling from the downstream end of the belt 1c to the weighing hopper 3 is calculated. Restrict. Shutter 6a
controls the width and number of the shutter body 8 which is pivotally supported on the pivot shaft 7 and has a fall groove 8a for the powder and granular material 4, and the width and number of the fall grooves 8a placed on the shutter body 8. For this purpose, a rubber plate 9 is provided with a groove 9a for the powder and granular material 4 to fall into, and the rubber plate 9 is placed on the rubber plate 9 and is fixed together with the rubber plate 9 to the shutter main body 8 by screws 10a or the like. It includes an adjusting plate 10 for regulating the depth of the falling groove 8a. As the rubber plate 9, rubber plates 9A and 9B having different numbers and positions of falling grooves 9a may be used.

11 is a cut damper, and the small amount damper 6
The shutter 11a is rotated around the pivot shaft 7 by the air cylinder 11b when the amount of powder or granular material 4 supplied to the weighing hopper 3 reaches a predetermined amount, that is, the weighing set value. The granular material 4 is moved toward the downstream end of the belt 1c to be pushed out to prevent the powder 4 from falling from the downstream end of the belt 1c to the weighing hopper 3.

A weighing machine 12 is attached to the weighing hopper 3, and measures the amount of powder 4 contained in the weighing hopper 3 and supplies it to an appropriate processing circuit (not shown). Furthermore, the operation of the measuring device of the present invention will be explained in detail.

When a start button (not shown) is pressed, the belt 1c of the belt feeder 1 begins to convey the powder 4 from the supply hopper 2 to the weighing hopper 3.

When the amount of powder 4 supplied to the weighing hopper 3 reaches a predetermined amount, for example, 80% of the set weighing amount, the speed of the belt 1c of the belt feeder 1 is reduced,
In addition, since the shutter 5a of the layer thickness damper 5 is pushed out, the layer thickness of the powder 4 on the belt 1c is regulated. In this state, the supply of powder 4 to the weighing hopper 3 is continued (see FIG. 5a).

When the amount of powder 4 supplied to the weighing hopper 3 reaches another predetermined amount, for example, 95 to 97% of the set weighing value, the shutter 6a of the small amount damper 6 releases the belt 1.
Since the granular material 4 is pushed out toward the downstream end of the belt 1c, the amount of the powder 4 falling from the downstream end of the belt 1c to the weighing hopper 3 is regulated. In this state, the supply of the powder 4 to the weighing hopper 3 is continued (see FIG. 5b).

When the amount of granular material 4 supplied to the weighing hopper 3 reaches the measurement setting value, the shutter 11a of the cut damper 11 is pushed out toward the downstream end of the belt 1c, so that the measurement starts from the downstream end of the belt 1c. Falling of the granular material 4 to the hopper 3 is prevented.
When the measuring device 12 detects that the powder or granular material 4 in the measuring hopper 3 has reached the measurement setting value, the cut damper 11 is activated.
falls until it stops the fall of the granular material 4.

The amount R of the granular material 4 approximately corresponds to the distance L between the cut damper 11 and the upper part of the granular material 4 in the weighing hopper 3, but since this causes a measurement error, it is preferable to remove it by appropriate means. For example, the cut damper 11 may be disposed close to the weighing hopper 3, or the cut damper 11 may be operated in anticipation of the amount R before the amount of powder 4 in the weighing hopper 3 reaches the measurement setting value. (Figure 5c
reference).

After the amount of powder 4 supplied to the weighing hopper 3 becomes the measurement setting value and the cut damper 11 operates, the lower part of the weighing hopper 3 is opened and the powder is transferred to a subsequent appropriate container. Close the lower part of the weighing hopper 3 again. Thereafter, the layer thickness damper 5, the small amount damper 6, and the cut damper 11 are returned to their initial states, and the speed of the belt 1c of the belt feeder 1 is increased to a high speed, so that the weighing hopper 3
The supply of powder and granular material 4 to the container is restarted. The above-described operations are then repeated.

In the above description, the case where the rubber plate 9 of the small quantity damper 6 is used has been explained, so the state of accumulation of the powder and granular material 4 in the weighing hopper 3 is as shown in FIG. 4a. When the rubber plates 9A and 9B of the small quantity damper 6 are used here, the state of accumulation of the powder and granular material 4 in the weighing hopper 3 becomes as shown in FIGS. 4b and 4c, respectively.

[Effects of the invention] As is clear from the above, the present invention includes a belt feeder that conveys powder and granules from a supply hopper to a weighing hopper, and a belt feeder that is arranged on the belt of the belt feeder and that controls the layer thickness of the powder and granules on the belt. A granular material comprising: a layer thickness damper for regulating the layer thickness; and a cut damper disposed near the downstream end of the belt to block the granular material from falling from the downstream end of the belt to the weighing hopper. In the weighing device of
The metering hopper is disposed near the downstream end of the belt and above the cut damper, and is placed in the weighing hopper after adjusting the layer thickness of the powder or granule by the layer thickness damper and before blocking the drop of the powder or granule by the cut damper. Since the structure is equipped with a small damper to prevent the powder from falling to the surface, it is effective in weighing the powder and granules with high accuracy, and also allows high-precision weighing to be performed without reducing work efficiency. It also has the effects that can be achieved.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing one embodiment of the present invention;
The figure is an enlarged view of the same part, Fig. 3 a, b, c is an enlarged perspective view of the same part, Fig. 4 a, b, c and Fig. 5 a,
b and c are explanatory diagrams of the same operation, and FIG. 6 is an explanatory diagram of a conventional example. 1... Belt feeder, 2... Supply hopper,
3...Measuring hopper, 4...Powder, 5...Layer thickness damper, 6...Small amount damper, 11...Cut damper, 12...Measuring device.

Claims (1)

[Scope of utility model registration request] a belt feeder that conveys powder and granules from a supply hopper to a weighing hopper; a layer thickness damper that is arranged on the belt of the belt feeder and regulates the layer thickness of the powder and granules on the belt; and a layer thickness damper that is arranged near the downstream end of the belt. a cut damper which is arranged near the downstream end of the belt and a cut damper for blocking the falling of the powder or granular material from the downstream end of the belt to the weighing hopper; It is arranged above the cut damper, and controls the falling of the powder or granule to the weighing hopper after the layer thickness of the powder or granule is adjusted by the layer thickness damper and before the fall of the powder or granule is blocked by the cut damper. A measuring device for powder and granular material characterized by being equipped with a small quantity damper.