JPH02224895A - Compression molding machine - Google Patents

Abstract

PURPOSE:To attain about two-fold higher productivity in one-cycle time by providing moving pestles on both sides of a cylinder for moving pestles, providing the moving mortars and stationary pestles on both sides of the moving pestles and moving the mortars in synchronization with the movement of the moving pestles, thereby simultaneously making two actions. CONSTITUTION:The moving pestle 27 and mortar 2 on one side move to execute agitation and at the same time, the moving pestle on the other side moves to compress powder raw materials with the moving pestle and the stationary pestle 3. The moving pestle and mortar on one side move to measure the raw materials and at the same time, the moving pestle and mortar on the other side move to discharge a tablet, etc. The moving pestle on one side moves to compress the raw materials with the moving pestle and the stationary pestle and at the same time, the moving pestle and mortar on the other side move to agitate the materials. The moving pestle and mortar on one side, thereafter, move to discharge the tablet, etc., and at the same time, the moving pestle and mortar on the other side move to measure the materials. The above- mentioned actions are successively and repeatedly carried out so that the two molding actions are simultaneously executed.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention is a single-shot tablet press (hereinafter referred to as a compression molding machine) that compresses powder raw materials into tablets or tablets (hereinafter referred to as tablets). ), and specifically relates to compression molding machines designed to improve productivity.

[Conventional technology]

Conventionally used compression molding machines are single-shot compression molding machines that use two punches and one mortar to compress the powdered raw material fed into the mortar with the punches from both sides of the mortar to form tablets. There is a rotary compression molding machine in which a plurality of punches and dies are arranged on a turntable, and after supplying powder raw materials to the dies, operations such as compressing the powder and discharging tablets are performed in sequence.

There are two types of single-shot compression molding machines, one in which the mortar is fixed and the pestles on both sides move, and one in which one of the pestles is fixed and the mortar moves to measure the powder raw material.
There are two types of compression molding machines: one in which the powder raw material is compressed using another punch, and the mortar and another punch are moved again to eject the product.The latter type of compression molding machine is called a with-droire type.

This With Droire formula will be explained with reference to FIG. A mortar block 1 is provided with a mortar 2 for forming the external shape of the tablet, a fixed pillar 3 is installed on one side of the mortar block 1, and a movable pillar 4 is installed on the other side of the mortar block 1.
The movable column 4 is connected to the cylinder rod 6 of the pressurizing cylinder 5 on the side opposite to the fixed column, so that the movable column 4 can be inserted into and removed from the mortar 2. Also, hopper 7
A stirring blade (not shown) is provided in the raw material pot 9 into which the powdered raw material 8 supplied from the raw material pot 9 is placed to make the density of the powdered raw material 8 uniform.

Next, the operation will be explained. As shown in FIG. 4(a), in a state in which the movable column 4 is retracted, a stirring blade (not shown) in the hopper 7 rotates to stir the powder raw material. Immediately after stirring, the mortar 2 is shown in Figure 4 (b
), it is moved to the fixed column 3 side by a moving device (not shown), and the powder raw material 8 is confined and measured in the mortar 2. Next, the pressure cylinder 5 is operated to move the movable column 4 to the fixed column 3 side, and the powdered raw material 8 weighed into the mortar 2 is transferred as shown in Fig. 4(C).
As shown in the figure, it is compressed between the fixed column 3. After the compression is completed, the mortar 2 further moves toward the fixed column 3, as shown in Fig. 4fd), and at the same time, the movable column 4 also moves toward the side opposite to the fixed punch 3, and the compression-molded tab left 10 is ejected from the mortar 2. do.

This completes the series of one-cycle operations and returns to the initial stirring operation.

[Problem to be solved by the invention]

Conventional single-shot compression molding machines can easily produce tablets 2) of complex shapes, such as polygonal or ring shapes, but they have the disadvantage of being poor in productivity because they can only produce one molding per cycle.

It is an object of the present invention to provide a compression molding machine that eliminates the above-mentioned drawbacks and can increase the productivity by about twice the conventional one cycle time.

[Means to solve the problem]

The compression molding machine of the present invention is a with-drore type compression molding machine, and is provided with a cylinder and a cylinder rod that extends through both ends of the cylinder and can take three positions, one on both ends of the cylinder and one in the middle. It consists of a movable mortar and a fixed pillar, and the mortars of both flanges are moved in synchronization with the movement of the movable pillar between three positions, so that two molding operations can be performed simultaneously.

[Effect]

One movable column and mortar move to stir, and at the same time the other movable column moves and the movable column and fixed column compress the powder raw material, and then one movable column and mortar move to weigh. At the same time, the other moving column and mortar move to eject tablets, etc. Next, one of the movable columns moves to perform compression using the movable column and the fixed column, and at the same time, the other movable column and mortar move to perform stirring.

Next, one movable column and mortar move to discharge the tablef etc., and at the same time the other movable column and mortar move to perform weighing.

The above operations are repeated in order.

〔Example〕

An embodiment of the compression molding machine according to the present invention will be described with reference to FIGS. 1 to 3. As shown in FIG. 1, this compression molding machine consists of a frame 11 serving as a machine base and a molding section 12 on top of the frame 11, and a hydraulic drive device (not shown) and the like are housed within the frame 11.

The structure of the molding section 12 is such that a cylinder flock 13 is arranged in the center in the longitudinal direction, and movable rod mounting plates 14 are placed on both sides of the cylinder block 13, a mortar flock 15 is placed on the outside of the rod mounting plate 14, and a fixed scale mounting plate 16 is placed on the outside of the cylinder block 13. A cylinder block 13 and a fixed scale mounting plate 16 are attached to the frame 11.

As shown in FIG. 2, the movable rod mounting plate 14 and the mortar block 15
is adapted to slide on a tie bar 17, which will be described later. Two tie bars 17 are provided horizontally passing through the cylinder block 13, and are attached to the cylinder block 1 with nuts 18.
3 are clamped and fixed from both sides, and both ends thereof are fixed to the fixed scale mounting plate 16 by means 7) 19 passing through the fixed scale mounting plate 16. Since the movable rod mounting plate 14 and the mortar block 15 slide on the tie bar 17, bushings 21 and 20 are respectively inserted into their respective penetrating portions so that they can move smoothly.

The center of the cylinder block 13 is a pressure cylinder 22 that is oriented parallel to the tie bar 17, and the cylinder rod 23 that protrudes on both sides is located at the right protruding position, intermediate position, and left protruding position shown in FIG. It is supposed to take a position. The tip of this cylinder rod 23 is the movable rod mounting plate 1
It is screwed onto the inner surface 24 of 4. Further, a boss 26 is protruded from the center of the outer surface 25 of the movable rod mounting plate 14, and a stepped movable column 27 is screwed onto the boss 26. Additionally, seal members 28 are fitted between both side surfaces of the pressure cylinder 220 and the protrusions of both cylinder rods 23 to prevent the fluid pressurized into the pressure cylinder 22 from leaking.

At a position corresponding to the movable column 27 at the center of the mortar block 15, there is a raw material bot 9 that temporarily stores 8 tons of powdered raw material supplied from the hopper 7 shown in FIG. 1 in preparation for weighing. A mortar 2 having a seven-lunge shape at one end is inserted from the movable column mounting plate 14 side, and the other end is slightly inserted into the raw material pot 9. And this day 2
A moving column 27 can be inserted into and removed from the inside. Further, a boss 31 is protruded from the center of the inner surface 30 of the fixed column mounting plate 16 at a position corresponding to the movable column 27, and the stepped fixed column 3 is screwed onto this boss 31. It can be inserted into and removed from the raw material bot 9 and the mortar 2. Further, cylinders 33 for moving the mortar block 15 are attached to both ends of the outer surface 320 of the fixed column mounting plate 16 (outside of the tie bar 17),
The rod 34 of this cylinder 33 passes through the fixed column mounting plate 16 and is connected to the mortar block 15 via a connecting member 35. The block 15 can be moved to three positions. Each of the members described above is constructed completely symmetrically on both sides with the cylinder block 13 at the center.

Next, the operation will be explained with reference to FIG. 2 and FIGS. 3(a) to 3(d). For ease of explanation, in these figures, the left side is referred to as the A side, and the right side is referred to as the B side. First, as shown in FIG. 3(a), the A side mortar block 15 is moved toward the B side by the cylinder 33, the A side mortar 2 is moved to the B side position, and the B side mortar block 15 is moved by the cylinder 33. 33 to the intermediate position, and the moving columns 27 on the A and B sides are moved to the B side by the pressurizing cylinder 22. While the movable columns 27 on the A and B sides and the mortar 2 on the A side move to the B side, stirring is performed, and the powdered raw material 8 is compressed between the movable column 27 and the fixed column 3 on the B side. . Then, when the moving column 27 moves to the B side, the moving rod mounting plate 14 on the B side operates the limit switch 40. In response to this signal, the A-side mortar 2 and the A and B-side movable punches 27 move to intermediate positions, as shown in FIG. 3(b), and the powder raw material is contained and measured within the A-side mortar 2. Simultaneously with these operations, the die 2 on the B side moves to the right and discharges the pellet 10 formed on the B side. When the movable column 27 moves to the above-mentioned intermediate position, the A-side movable rod mounting plate 14 operates the limit switch 41. Upon receiving this signal, the A and B side movable punches 27 are moved as shown in Fig. 3(C).
moves to the A side, and at the same time the mortar 2 on the B side moves to the A side, compressing on the A side and stirring on the B side. And the moving column 27 is A
When moved to the A side, the moving rod mounting plate 14 on the A side operates the limit switch 42. After receiving this signal, Fig. 3(d)
As shown in , the mortar 2 on the A side moves to the A side, and the mortar 2 on the B side moves to the intermediate position on the B side, and at the same time, the movable columns 27 on the A and B sides move to the intermediate position on the B side. The tablet 10 is ejected and weighed on the B side. When the die 2 on the A side moves to the intermediate position on the B side, the die block 15 operates the limit switch 43. Upon receiving this signal, the operation returns to the above-described continuous operation in which stirring is performed on the A side and compression is performed on the B side. Hereafter, these operations are repeated in sequence.

In this embodiment, I7 Mitswitches are used to switch each operation, and these limit switches are used to switch each operation. However, the switching is not limited to limit switches, and it is also possible to use other switches or linear scales. be.

〔Effect of the invention〕

According to the present invention, movable pillars are provided on both sides of a cylinder for moving a pestle, and a movable mortar and a fixed pillar are further provided on both sides of these movable pillars, and the mortar is moved in synchronization with the movement of the movable pillar. Since two operations are performed simultaneously, productivity can be approximately doubled in one cycle time compared to the conventional method.

[Brief explanation of the drawing]

1 to 3(a) to 3(d) show an embodiment of the compression molding machine of the present invention. FIG. 1 is a front view, and FIG. 2 is a view along the Z-Z line in FIG. Cross-sectional view, Figures 3(a) to (d)
) is an explanatory diagram of the operation, and fourth Effl (a) to (d) are explanatory diagrams of the operation of a conventional compression molding machine. 2... Mortar, 3... Fixed pillar, 8...
...Powder raw material, 10...Tablet, 12.
...Molding section, 22...Pressure cylinder (
Cylinder], 27...Moving rod.

Claims (1)

[Claims] A movable mortar adjacent to the powder raw material supply part, a movable pestle that is paired with the mill and moves while being connected to a cylinder, and a fixed pestle that is paired with the mill and is provided opposite to the movable pestle. The die is moved relative to the movable punch and the fixed punch, and the powder raw material measured and taken between the two punches is compressed by the movable punch and the fixed punch to form a tablet or a tablet. A compression molding machine of the type includes a cylinder, a cylinder rod that extends through both ends of the cylinder and can take three positions, ie, on both ends of the cylinder and in the middle, and a movable punch connected to both ends of the cylinder rod, and a movable punch connected to both ends of the cylinder rod, and It consists of a movable mortar and a fixed punch provided in pairs on each punch, and the mortar is moved in synchronization with the movement between the three positions of the movable punch to perform two molding operations at the same time. Characteristic compression molding machine.