JPH0720633B2 - Material feeder for compression molding machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a device for supplying powdery material to a mold of a compression molding machine.

(Prior Art) A conventional device of this type is provided with a feeder 2 below a box-shaped hopper 1 so that the feeder 2 can reciprocate, as schematically shown in FIGS. 5 and 6. 2 is provided with a weighing unit 3. The measuring unit 3 includes a pipe body 3a protruding 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, a shutter and a measuring pipe. And a seat plate 3d for supporting the seat plate 3d. The seat plate 3d has a screw shaft 3e and a spring member 3f and is 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 by the lower edge of the hopper as the feeder 2 moves forward, and scraping off excess material, and the weighing unit 3 further advances with the feeder 2 to fix the fixed metal. 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) In such a feeder, a heavy feeder has to be moved integrally with the weighing unit when feeding the material, and since the weighing is performed by scraping, the feeding apparatus is performed at high speed. When the feeder is moved, variations in weighing occur and the material density in the cavity is impaired.

Further, the adjustment of the measured value due to the change of the mold and the change of the molding condition is performed by once stopping the molding machine and using the respective measurement adjusting screws, but it is difficult to move the four screws up and down evenly. ,
There was a problem that the volume for each measurement was liable to change and it took time to obtain an accurate measurement value.

The present invention was conceived in order to solve the above-mentioned conventional problems, and an object thereof is to easily change a measured value by vertically moving a part of a measuring plate constituting a measuring section. Another object of the present invention is to provide a new material supply device which has high weighing accuracy and can improve the supply speed.

(Means for Solving the Problems) The features of the present invention according to the above object are that a box-shaped hopper portion carried on a machine base, a material supply pipe installed above the hopper portion, and a lower side of the hopper portion. The weighing unit provided on the hopper, and the weighing unit is hung on the upper weighing plate attached to the bottom of the hopper and the supporting member provided on the hopper so that the vertical position can be adjusted. It consists of a lower metering plate provided on the lower side, and the upper metering plate has a required number of metering ports that open at the bottom of the hopper and a plurality of metering pipes that project downwards below each metering port. In addition, a slidable upper shutter interposed between the measuring port and the measuring pipe is provided, and the lower measuring plate is movably fitted to the measuring pipe to form a measuring chamber. And having a discharge port that opens at the bottom of each measuring cylinder Both are provided with a slidable lower shutter interposed between the measuring cylinder and the discharge port.

(Operation) In the above configuration, when the position of the supporting member provided on the hopper is lowered, the position of the lower weighing plate is also lowered, and the volume of the weighing chamber formed by the weighing pipe and the weighing cylinder fitted together increases.
On the contrary, when the position is raised, the volume of the measuring chamber becomes smaller, and the change of the volume adjusts the material measurement.

Further, after the metering port is blocked by the upper shutter to carry out the weighing, the upper shutter blocks the supply of the excess material and keeps the weighing constant.

(Example) In the drawing, 11 is a mold clamping mechanism of a compression molding machine, in which a fixed mold 12 having a required number of core molds is attached to an upper fixed plate 12 and a lower movable plate 15 connected to a mold clamping ram 14. A movable mold 16 having a cavity into which the core mold is inserted is attached to the.

20 is a material supply device arranged on the side of the mold clamping mechanism 11, which is a machine base.
It is composed of a box-shaped hopper portion 23 carried by 22 and a weighing portion 24 attached to the lower side thereof, and a feeder portion 50 is located below the weighing portion.

The hopper portion 23, as shown in FIG. 2 and FIG.
A rectangular side wall 25 and a holding plate 26 provided on the upper edge thereof,
It is formed from the upper measuring plate 27 provided on the lower edge of the side wall,
The holding plate 26 and the upper measuring plate 27 are connected by a rod 28.

Above the center of the inside of the hopper portion 23, a static mixer 29 is provided inside, and a bottomed material feed pipe 30 having an upper part connected to a material transfer hose is fixedly provided at the center part of the holding plate 26. The lower side wall of the material feeding pipe 30 is provided with a lower delivery port 31a that is open to all four sides and an upper delivery port 31b that is open toward the four corners. Further, on the outside of the upper portion of the threaded material feeding pipe 30, a horizontal support member 34 by a plate body is attached with a nut 32 so that the vertical position can be adjusted, and a plurality of upper end members are fixed to the support member 34. Book rod 33
A lower measuring plate 35 is connected to the lower end of the upper part of the upper part and is hung, and is positioned below the upper measuring plate 27.

The weighing unit 24 is composed of the upper weighing plate 27 fixed to the hopper side wall 25 to form a hopper bottom, and the lower weighing plate 35 positioned in parallel to the lower side thereof. Upper weighing plate
27 is an upper plate 27a having the same number of funnel-shaped measuring ports 36 as the cavity of the mold, and a lower plate 27b having a downward measuring pipe 37 positioned at the measuring port 36 integrated through 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 is fitted with the measuring pipe 37, and the measuring chamber 40
And an upper plate 35a having an upward measuring tube 39 that forms
A lower plate 35b having a discharge port 40a opened to the lower side of 0 is integrally connected via a spacer, and a lower shutter 41 having a predetermined number of openings is slidably provided between both plates.

The feeder unit 50 includes a base member 51 on the machine base located below the weighing unit 24, and a feeder block 55 fixed to the upper portion by guide rods 52 provided on both upper surfaces of the base member 51, together with the 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. Below the feeder block 55, a feeder shutter 57 for opening and closing the outlet of the material supply hole 56 is slidably provided.

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 feed cylinder.

Next, the operation will be described.

First, with the shutters 38 and 41 of the weighing unit 24 and the feeder shutter 57 closed, a powdery or granular material is fed into the material supply pipe 30 from the material transfer hose by compressed air or a screw conveyor, etc., the material is static. While the particle size is uniformly dispersed by the mixer 29, the particles fall from the upper and lower outlets 31a and 31b in all directions onto the upper measuring plate 27 which also serves as the bottom plate.

Next, when the upper shutter 38 is actuated and the weighing port 36 is opened, the material at the bottom of the hopper is measured by the measuring tube 37 and the measuring tube 39.
Inflow to 40. Then, by closing the upper shutter 38 and cutting the material in the measuring port, 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 to the material supply hole 56 of the feeder block 55, and at a predetermined timing, the lower shutter 41 is again the discharge port.
Close 40.

After that, the feeder cylinder 62 is operated to move the feeder block 55 forward above the movable mold 16 in the mold open state, and the feeder shutter 57 is opened at that position to open the material supply hole.
56 weighing materials fall into the cavity and are supplied.
After the supply is completed, the material supply port 56 is closed again by the feeder shutter 57, and the feeder block 55 is returned to the lower side of the weighing section 24.

In addition, when changing the weighing of the material, the lower weighing plate 35 together with the supporting member 34 is used.
Can be easily carried out by moving up or down to adjust the volume of the measuring chamber 40. When the position of the support member 34 is lowered by operating the nut 32, the position of the lower measuring plate 35 is also lowered, and the volume of the measuring chamber 40 formed by the measuring pipe 37 and the measuring cylinder 39 fitted together increases. On the contrary, when the position is raised, the volume of the measuring chamber 40 becomes smaller, and the change of the volume adjusts the material measurement.

(Effect of the Invention) As described above, the present invention is provided with the box-shaped hopper portion 23 carried on the machine base 22, the material supply pipe 30 installed in the upper portion of the hopper portion, and the hopper portion lower side. The weighing unit 24 comprises an upper weighing plate 27 attached to the bottom of the hopper unit 23 and an upper weighing plate 27 suspended from a supporting member 34 provided on the hopper unit so that the vertical position can be adjusted. Since it is composed of the lower measuring plate 35 provided on the lower side, the amount of the feed material can be adjusted by adjusting the vertical position of the supporting member, and the adjustment of the amount can be performed at one place. Since the adjustment can be performed as it is during the molding without requiring time, it is not necessary to temporarily stop the molding unlike the conventional case. As a result, the setup time at the time of molding, the adjustment time of the supply amount, etc. are drastically shortened, and the productivity is further improved. An upper metering plate having a plurality of downwardly projecting metering pipes 37 under each metering port 26, and a slidable upper shutter 38 interposed between the metering ports 36 and 37. 27, a required number of upwardly facing measuring tubes 39 that are movably fitted to the measuring tube 37 to form a measuring chamber 40,
Since it has a discharge port 49a opened on the lower side of each measurement chamber 40, and a lower measurement plate 35 having a slidable lower shutter 41 interposed between the measurement cylinder 39 and the discharge port 49a, By closing the shutters at the upper and lower parts, the weighing is performed reliably, and the supply of excess material is also prevented, which has the advantage of being able to perform the weighing with extremely high accuracy compared to the conventional case.

[Brief description of drawings]

The drawings show an embodiment of a material supply device for a compression molding machine according to the present invention. FIG. 1 is a front view showing a part of the compression molding machine in a vertical section, FIG. 2 is a vertical front view, and FIG. The figure is a horizontal cross-sectional view of the hopper, FIG. 4 is a vertical cross-sectional view of the weighing section and the feeder, FIG. 5 is a vertical cross-sectional front view of a conventional feeder, and FIG. is there. 22 …… Machine stand, 23 …… Hopper section 24 …… Weighing section, 27 …… Upper weighing plate 30 …… Material feeding pipe, 32 …… Nut 33 …… Rod, 34 …… Supporting member 35 …… Lower weighing Plate, 38 ... Top shutter 39 ... Measuring tube, 40 ... Weighing chamber 40a ... Discharge port, 41 ... Lower shutter

Claims (1)

[Claims] 1. A box-shaped hopper portion supported on a machine base, a material supply pipe installed above the hopper portion, and a measuring portion provided below the hopper portion. It consists of an upper weighing plate attached to the bottom of the hopper, and a lower weighing plate below the upper weighing plate that is suspended from a support member on the hopper so that the vertical position can be adjusted. The weighing plate has a required number of weighing ports that open at the bottom of the hopper and a plurality of downwardly projecting weighing pipes under each weighing port, and slides between the weighing ports and the weighing pipes. A movable upper shutter is provided, and the lower metering plate is movably fitted to the metering tube to form a metering chamber, and a required number of upwardly facing measuring cylinders, and a discharge port that is open to the lower side of each metering chamber. In addition to having a slidable Material supply device of a compression molding machine characterized in that it comprises a section shutter.