JPH0761650B2 - Material feeder hopper - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a hopper for an apparatus that supplies powdery material to a mold of a compression molding machine.

[Prior art]

As shown in FIGS. 5 and 6, a conventional device of this type is provided with a feeder 2 on the lower side of a box-shaped hopper 1 so as to be reciprocally movable, and the feeder 2 is provided with a weighing unit 3. It is set up. This measuring unit 3 is a pipe body 3a projecting below the feeder plate 2a.
A measuring pipe 3b fitted to the pipe body 3a, a shutter 3c for opening and closing the opening of the measuring pipe 3b, and a seat plate 3d for supporting the shutter and the measuring pipe, the seat plate 3d being a screw shaft 3e. The spring member 3f and the spring member 3f are attached to the feeder plate 2a so as to be vertically adjustable. The material is weighed by sliding the upper surface of the feeder plate 2a with the lower edge of the hopper by the forward movement of the feeder 2 and scraping off the surplus material. The material is supplied into the cavity by being fed between the mold 4a and the movable mold 4b and opening the shutter 3c by the cylinder 5.

[Problems to be Solved by the Invention]

Usually, the material of synthetic resin used for compression molding is a mixture of coarse-grained and powdery ones, and if there is a bent part during the transfer to the hopper by the material hose,
Due to the difference in particle size, the material is often separated into granular form and powder form and fed into the hopper. In addition, since it is fed from the central opening, the material is easily placed in a heap at the center of the hopper, which may be the reason why the material is not well distributed to the supply ports that are opened vertically and horizontally on the bottom of the quadrilateral hopper, and the weight difference Since this also occurs, there is a problem in that the density also varies. The present invention was conceived in order to solve the above-mentioned conventional problems, and an object thereof is to provide a new hopper capable of feeding a material uniformly and at the same density to each supply port on the bottom surface of the hopper. To provide.

[Means for solving problems]

According to the present invention according to the above-mentioned object, a bottomed material supply pipe is provided in the center of a box-shaped hopper, and a delivery outlet is opened on the lower side wall of the box-shaped hopper. It consists of an upper outlet that opens toward the four corners of the hopper and a lower outlet that opens toward the sides.

[Work]

In the above configuration, the material is mixed and uniformized by the static mixer, and the material is sent out from the side outlet to each direction of the hopper bottom surface.

【Example】

In the figure, 11 is a mold clamping mechanism of the compression molding machine, in which a fixed mold 13 having a required number of core molds is attached to an upper fixed plate 12 and the core mold is attached to a lower movable plate 15 connected to a mold clamping ram 14. Mounted is a movable mold 16 having a cavity into which is received. 20 is a material supply device arranged on the side of the mold clamping mechanism 11, which is a machine base.
A box-shaped hopper 23 carried by 22, a weighing unit 24 fixed to the lower side of the hopper 23, and a feeder unit disposed below the weighing unit.
It consists of 50 and. As shown in FIGS. 2 and 3, the hopper 23 includes a rectangular side wall 25, a holding plate 26 attached to the upper edge of the square side wall 25, and an upper weighing plate 27 attached to the lower edge of the side wall. And is connected by a holding plate 26, an upper measuring plate 27 and a rod 28. A static mixer 29 is provided in the center of the holding plate 26, and a bottomed material feed pipe 30 having an upper part connected to a material transfer hose is provided. A lower delivery port 31 that is open in all directions and an upper delivery port 32 that is open toward the four corners are provided. On the outside of the upper part of the threaded material supply pipe 30,
With 33, a horizontal support plate 34 is movably mounted up and down, and a lower measuring plate 35 is connected to the supporting plate 34 in a suspended state by a rod 36 so that it is positioned below the upper measuring plate 27. is there. The weighing unit 24 is composed of an upper weighing plate 27 fixed to the hopper side wall 28 to form a hopper bottom, and a lower weighing plate 35 positioned below and parallel to the upper weighing plate 27. Upper weighing plate
27 is an upper plate 27a having the same number of funnel-shaped measuring ports 36 as the number of mold cavities, and a lower plate 27b having a downward measuring pipe 37 positioned at the measuring port 36, which is integrated with a spacer. An upper shutter 38 having a required number of openings is slidably interposed between the both plates. Further, the lower measuring plate 35 includes an upper plate 35a having an upward measuring tube 39 that fits with the measuring tube 37 and a lower plate 35b having a discharge port 40 that abuts on the lower side of the measuring tube 39 with a spacer. A lower shutter 41 having a predetermined number of openings is slidably provided between the both plates. The feeder unit 50 includes a base member 51 on a machine base located below the weighing unit 24 and guide rods 52 provided on both sides of an upper surface of the base member 51, together with a feeder block 55 fixed to the upper portion, and a weighing hopper. 23 and a feeder plate 54 that reciprocates between the molds, and the feeder block 55 is provided with a material supply hole 56 located below the discharge port 40. A feeder shutter 57 for opening and closing the outlet of the material supply hole 56 is slidably provided below the feeder block 55. A sealing material (not shown) is applied to the sliding side portions of the shutters and the fitting portion between the measuring pipe 37 and the measuring cylinder 39. Further, as shown in FIGS. 3 and 4, an air groove 58 is partially provided, and compressed air can be blown from the air groove 58 to the sliding portion and the fitting portion. . In the figure, 59 and 60 are air cylinders that drive each shutter, 61 is a screw member for adjusting the height of the feeder base,
62 is a feeder cylinder. Next, the operation will be described. The material fed into the material supply pipe 30 is mixed by the static mixer 29 to have a uniform particle size distribution. The material in the pipe goes from the upper and lower outlets 31, 32 to eight directions,
It falls on the upper weighing plate 27 which also serves as the bottom plate. Next, when the upper shutter 38 is operated to open the measuring port 36, the material at the bottom of the hopper flows into the measuring tube 39 through the measuring pipe 37.
Therefore, when the upper shutter 38 is closed and the material in the measuring port is cut, a certain amount of material is measured between the upper and lower shutters 38, 41. This metering material is discharged from the discharge port 40 by opening the lower shutter 41.
From the bottom into the material supply hole 56 of the feeder block 51, and at a predetermined timing, the lower shutter 41 again discharges.
Close 40. After that, the feeder cylinder 62 is operated to move the feeder forward above the movable mold 16 in the mold open state, and when the feeder shutter 57 is opened at that position, the measurement material in the material supply hole 56 drops into the cavity and is supplied. Is done. Further, the material supply hole 56 after the supply is completed is closed again by the feeder shutter 57, and the feeder is returned to the lower side of the weighing section 24. As described above, the present invention incorporates a static mixer in the material supply pipe provided in the central portion of the hopper so that the material is mixed before feeding to the hopper to prevent material unevenness, and the material is further attached to the lower side wall. Since it is configured so as to send out from each of the supply ports to each of the supply ports at the bottom of the hopper, there is no difference in the material distribution or the density depending on the position of the supply port. Moreover, the structure is simple and does not cause a failure because it is only necessary to open a delivery port on the lower side wall of the pipe body and insert a static mixer inside, and the cost is not particularly high. Further, since the material is supplied into the hopper through the plurality of outlets, the material is not accumulated as one mountain in the hopper but is accumulated as a plurality of small mountains, so that the material level is constant. As a result, the density is made uniform, and the weighing accuracy is improved. Furthermore, since the material is supplied into the hopper by the upper outlets toward the four corners and the lower outlets toward the sides, the material is supplied from the lower lower outlet to the side surface closer to the material supply pipe, Material is supplied from the upper outlet to the corner farther from the material supply pipe, and as a result,
Since the material is preferentially supplied to the corners where the material level tends to be low, even a square hopper can always be kept constant, and the weighing accuracy can be improved.

[Brief description of drawings]

The drawings show one embodiment of the supply device according to the present invention, and FIG. 1 is a front view showing a part of the compression molding machine in a longitudinal section,
2 is a vertical sectional front view, FIG. 3 is a cross-sectional view of the hopper,
FIG. 4 is a vertical sectional view of the weighing section and the feeder section, FIG. 5 is a vertical sectional front view of a conventional feeder, and FIG. 6 is a vertical sectional front view of the same during feeding. 23 …… Hopper part, 24 …… Weighing part 29 …… Static mixer 30 …… Material supply pipe 31 …… Lower delivery port 54 …… Upper delivery port 36 …… Supply port

Claims (2)

[Claims] 1. A bottomed material supply pipe is provided at the center of a box-shaped hopper, and a delivery port is opened on the lower side wall thereof.
A hopper for a material supply device, characterized in that a static mixer is provided inside the upper part. 2. The hopper for a material feeding apparatus according to claim 1, wherein the delivery port comprises an upper delivery port opened toward four corners of the hopper and a lower delivery port opened toward the side. .