JPH0726075Y2 - Rotary powder compression molding machine - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] According to the present invention, a main shaft is rotatably disposed in the center of a molding machine, a rotary disk is fixed to the main shaft, and the main shaft is driven to drive the main shaft. The present invention relates to a rotary powder compression molding machine in which a rotary disk is rotated together with a die or a punch.

[Prior Art] Conventionally, a rotary type in which a powder as a raw material is filled in a mortar arranged on a rotary disk and compressed by an upper pestle and a lower pestle to form a compression molded product such as a tablet or an electric component. There is a powder compression molding machine.In particular, instead of installing a gear on the outer circumference of the rotating disk to rotate it, a main shaft is installed vertically on the rotating disk and the main shaft is rotated by a drive source such as a motor to rotate the rotary disk. , There is a rotary powder compression molding machine (see Japanese Patent Application No. 55-84462) that prevents the scattered powder from entering a drive such as a gear and causing trouble in rotation.

[Problems to be Solved by the Invention] Although it is possible to obtain a molded product for a while even in the conventional technology, with this alone, the upper frame, which is attached to the upper compression roll at the time of compression, is bent and the upper compression roll is bent. There is a problem that the powder compression force due to the upper and lower punches becomes unstable due to the change of the position of No. 2, and there is also a problem that the inner square ring of the radial bearing that supports the upper end of the main shaft is easily worn.

That is, the compression is such that the upper and lower punches are compressed vertically by passing between an upper compression roll axially supported by the upper frame and a lower compression roll supported by the machine body, and the upper frame is bent. Therefore, if the distance between the upper and lower compression rolls fluctuates, the fluctuation directly changes the compression pressure of the molded product. Therefore, there is a problem that the thickness of the tablet or the like, which is a molded product, fluctuates unduly, and the quality thereof is not constant.

In recent years, this type of molding machine has been required to be compact and lightweight, and automatically adjust the powder filling amount into the die hole based on the change in compression pressure, and to expand and contract the punch due to temperature changes. Correspondingly, there is a demand for a molding machine with an automatic adjustment mechanism such as changing the height of the compression roll to automatically keep the thickness of the molded product constant. The generation of distortion due to bending hinders their automatic adjustment accuracy.

Further, in the conventional type, the upper end of the main shaft is supported by a radial bearing on the inner periphery of the upper frame or a bearing block attached to the lower surface of the upper frame with bolts or the like. If the upper frame repeatedly bends upward at each compression step, the sliding of the members will be repeated at the radial bearing part.
There arises a problem that the inner square ring of the radial bearing is easily worn.

The present invention has been made in view of such problems of the prior art, and an object of the present invention is to provide an upper compression roll with a simple structure in which a connecting shaft that rotates together with a main shaft and a thrust bearing are arranged. The upper frame to be attached is unlikely to bend upward, and it is possible to obtain a molded product with good quality by suppressing the position change of the upper compression roll during compression, and to improve the durability of the device reasonably. It is intended to provide a rotary powder compression molding machine capable of

[Means for Solving the Problems] In order to achieve the above object, the rotary powder compression molding machine according to the present invention drives a rotary disk by a main shaft rotatably and immovably supported by a machine body, In a case where a powder is filled while the rotating disk is rotating and the powder is compressed to form a molded article, the upper end of a connecting shaft provided integrally rotatably at the upper end of the main shaft is passed through the upper frame to The thrust bearing is interposed between the upper frame and the brim element provided on the upper end of the connecting shaft.

[Operation] Each time the upper and lower punches with the punches inserted into the powder-filled die pass between the lower compression roll and the upper compression roll as the spindle and turntable rotate, the powder in the die is removed. Compression molded.
During the compression, a large upward compression reaction force acts on the upper frame holding the upper compression roll. However, according to the present invention, the upper end of the connecting shaft that rotates integrally with the vertically immovable support shaft is projected to the upper frame, and the thrust bearing is provided between the upper frame and the brim element provided at the upper end. As a result, the upper frame is prevented from being deformed upward by the collar element.
That is, even if the central portion of the upper frame tries to bend upward, the collar element supported by the support shaft and the connecting shaft, which cannot move up and down, presses the upper surface side of the upper frame via the thrust bearing. The bending will be effectively suppressed or prevented. Further, in other words, the upward stress exerted on the upper frame during compression is applied to the main shaft via the thrust bearing, the collar element and the connecting shaft. Conventionally, a vertical frame is used to receive the peripheral portion of the upper frame, but in the present invention, in addition to that, the main shaft receives the stress in the central portion of the upper frame on which the upper compression roll is rotatably supported. The upper frame is solid because the rotating connection shaft and the thrust bearing that receives compressive pressure while rotating receives the aircraft through its main shaft (the upper frame is pulled by the aircraft even if it tries to deform upward due to stress). The compression roll spacing will not change.

[Embodiment] An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view of a main part.

A large number of dies 9 are arranged on the outer periphery of the turntable 1 and are attached to the main shaft 2.

This spindle 2 is a machine body 11 and a fixed platen fixed to the machine body 11.
It is rotatably and immovably supported by 12 via a radial thrust bearing 11a, and is driven by its lower end being connected to a motor 19 via a worm wheel 14 and a worm 15.

The lower end of the connecting shaft 5 is screwed onto the upper end of the main shaft 2, and the upper end 5a of the connecting shaft 5 penetrates the upper frame 4 and projects onto the upper frame 4. The upper end 5a of the connecting shaft 5 is in the shape of a bolt having a thread groove formed on the outer periphery, and a nut 5b as a brim element is screwed onto the upper end 5a. And this nut 5b
A thrust bearing 17 and a spacer 16 are provided between the upper frame 4 and the upper frame 4.

The upper compression roll 3 is for sequentially pressing the upper punch 6 slidably inserted into the rotary disc 1 downward, and is rotatably mounted on the upper roll base 20 fixed to the upper frame 4. It is worn.

The lower compression roll 8 is for sequentially pushing the lower punches 7 slidably inserted into the rotary table 1 upward,
It is rotatably attached to a lower roll base 21 fixed to the.

10 is a feedstock for quantitatively filling powder, 18 is a power lock for torque adjustment, and 22 is a vertical frame attached to the machine body 11 to fix the peripheral edge portion of the upper frame 4 and surround the side surface of the molding machine.

The upper punch guide rail base 13 is attached to the upper frame 4 and rotatably holds the main shaft 2 to prevent the runout of the main shaft 2.

The present invention is not limited to the above-mentioned embodiment, and for example, the connecting shaft may be a bolt, in which case the head of the bolt serves as a collar element. Further, the connection shaft may be provided integrally with the main shaft. That is, the upper end side of the main shaft may be stepped and the diameter thereof may be reduced to form a connecting shaft.

[Advantages of the Invention] As described in detail above, according to the present invention, the central portion on the upper surface side of the upper frame can be locked by the connecting shaft and the brim element connected to the main shaft. Therefore, the upward stress exerted on the upper compression roll can be shared and supported by the main shaft held by the machine body. Therefore, it is possible to effectively suppress or prevent the upper frame from bending upward during compression.

Therefore, it is possible to effectively suppress the fluctuation of the compressive stress caused by the bending of the upper frame, to obtain an accurate and uniform molded product, and to adjust the compression pressure based on the judgment pressure automatically. This has the effect of making the adjusting mechanism more accurate.

Further, since the thrust bearing is provided between the brim element and the upper frame, an undesired twisting force may act on the main shaft even though the deformation of the upper frame is suppressed by the main shaft. Absent.

With such a configuration, it is possible to eliminate the problem that the upper frame is bent at each compression operation and the radial bearing interposed between the upper frame and the main shaft is worn.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part showing an embodiment of the present invention. 1 ... Turntable, 2 ... Spindle, 3 ... Upper compression roll, 4
...... Upper frame, 5 ...... Connecting shaft, 5a ...... Upper end, 5b …… Bill element (nut), 6 …… Upper punch, 7 …… Lower punch, 8 …… Lower compression roll, 9 …… Miller, 10 …… Feedsch, 11 …… Aircraft, 12 …… Fixed plate, 13 …… Upper punch guide rail stand, 14 …… Warm wheel, 15 …… Warm, 16…
… Spacer, 17 …… Thrust bearing, 18 …… Power lock, 19 …… Motor, 20 …… Upper roll stand, 21 …… Lower roll stand, 22 …… Vertical frame

Claims (1)

[Scope of utility model registration request] 1. A rotary disk (1) is driven by a main shaft (2) rotatably and immovably supported by a machine body (11), and powder is filled while the rotary disk (1) is rotating. In a rotary powder compression molding machine for compressing the powder to make a molded product, an upper end (5a) of a connecting shaft (5) integrally rotatably provided at an upper end of a main shaft (2) penetrates an upper frame (4). And project it onto the upper frame (4), and insert a thrust bearing (17) between the upper frame (4) and the brim element (5b) provided on the upper end (5a) of the connecting shaft (5). A rotary powder compression molding machine characterized by being installed.