JP2002336996A - Compression molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compression molding machine which has a simple structure and can carry out two-stage compression molding at high speed with few amounts of hydraulic oil. SOLUTION: A pressure block (4) is attached to one end of a screw shaft (10) screwed in a frame (1) freely slidably to the guide (9) of the frame (1). A gear (5) is attached freely slidably to a spline shaft (10a) formed at the other end. The pressure block (4) carries out the compression molding by means of cylinders (3) provided in the frame and the screw shaft (10) driven by an additional pressure mechanism (25) and a gear (5).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compression molding machine using a screw press for performing compression processing by moving a pressure block so as to mainly compress powder.

[0002]

2. Description of the Related Art For example, in molding refractory bricks, there is known a technique of compressing raw material powder by a hydraulic press. In recent years, in order to perform high-density compression molding, it is common practice to increase the density of molded products by repeatedly performing pressure molding at a pressure of 0.1 to 0.3 m / m many times in the final stage of molding pressure. Is being done.

[0003] For this purpose, the present applicant has filed a patent application no.
In Japanese Patent Laid-Open No. 2 (1993), a compression molding machine in which a screw shaft is rotationally driven by an oil motor, this pressurizing operation is repeated several times, and finally, an additional pressurizing mechanism further pressurizes the press is proposed.

Although such a compression molding machine is effective in itself, it transmits a driving force by engaging a gear provided on a screw shaft with a gear provided on a rotating shaft of an oil motor. Gears are easily damaged due to the impact force during pressurization, generating noise, and trying to rotate at high speed,
The oil volume is high and the handling is cumbersome and therefore the whole device tends to be bulky.

[0005]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a compression molding machine which can perform a high-speed press work with a relatively simple apparatus, has no noise, and has excellent durability.

[0006]

According to the present invention, in a compression molding machine using a screw press for moving a pressure block to perform a compression process, a pressure block slidably provided on a frame is provided. One end of a screw shaft screwed with a female screw member fixed to the frame is attached, and the other end is slidably attached to a gear driving the screw shaft in the axial direction, and the gear is connected to an end of the frame. Part is mounted rotatably and axially positioned, a plurality of cylinders are mounted between the frame and the pressure block, and an additional pressure mechanism that engages and disengages the gear is provided. Characteristic compression molding machine.

According to the present invention, the other end of the screw shaft and the gear are spline-fitted, and a flange formed at one end of the screw shaft is rotatable with the pressure block via a pressure receiving plate. Is engaged.

According to the present invention, the additional pressure mechanism includes a clutch member that engages with and disengages from the gear, and a drive cylinder that drives the clutch member.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, a screw shaft 1 is provided at the center of a beam-like member 1a of a frame 1 formed in a gate shape.
The upper end of the hole 2 is provided with a bush 8 for supporting the outer periphery of the screw shaft 10, and the lower end thereof is provided with a female screw member 7 which engages with the screw portion 11 of the screw shaft. It is fixed.

At the upper end of the frame 1, a support base 6 for rotatably supporting a flange portion 5a of a gear 5 having a sufficient inertia force and for positioning in the axial direction (vertical direction) is fixed. A bush 6 a is mounted inside the base 6.

At the center of the gear 5, there is provided a female spline portion 5b which engages with the spline portion 10a of the screw shaft 10. The screw shaft 10 is slidable with respect to the gear 5. I have.

A flange 1 is provided at the lower end of the screw shaft 10.
The end face of the flange 12 is formed to be a spherical surface having a large radius, and is rotatably attached to the pressing block 4 via a pressure plate 13. Are configured so that the axial directions are loosened.

Further, the pressure block 4 is guided by a pair of guides 9, 9 attached to a pair of pillars 1b, 1b constituting the frame 1 and is slidably mounted in a vertical direction. Each of the rods 3a is connected to a plurality of (two in the illustrated example) cylinders 3 provided on the cylindrical member 1a.

In the illustrated embodiment, the cylinder 3 is integrally built into the beam-like member 1a of the frame 1, but a separate cylinder may be attached to the beam-like member 1a.

An upper plunger 15 is attached to the lower surface of the pressure block 4, and a lower frame 1c is a known means of a lower plunger 17, a mold 16 and a supporting means for vertically supporting the mold 16. A plurality of lifting cylinders 18 are provided. Here, reference numeral 20 indicates a compounding material to be molded, and a spring may be used instead of the lifting cylinder 18 as a supporting means.

Referring to FIG. 2, a plurality of (four in the illustrated example) additional pressure mechanisms 25 are mounted radially outward of the gear 5 above the beam-like member 1a of the frame 1 (see FIG. 2). The mounting method is omitted).

The additional pressure mechanism 25 includes a clutch member 27 having teeth that engage and disengage with the gear 5 and a drive cylinder 26 that drives the clutch member 7 engaged with the gear 5, and reference numeral 27 a denotes the clutch member 27. A clutch cylinder engaged and disengaged from the gear 5 is shown, and the drive cylinder 26 and the clutch cylinder 27a are respectively connected to a control device (not shown) of the compression molding machine.

The operation will be described below. First, the compounding material 20 to be compression molded is molded into a mold 16 by a conventionally known technique.
And pressurized oil is supplied to the cylinder 3 by operating the control device of the compression molding machine, the pressure block 4 is moved downward, and the compound material 20 is pressed into the mold 16 by the upper plunger 15. Mold.

Simultaneously with the lowering of the pressure block 4, the screw shaft 10 is pulled downward by the flange 12, and the screw portion 11 integral with the screw shaft 10 is screwed with the female screw member 7 fixed to the frame 1. Therefore, the screw shaft 10 descends while rotating.

The spline portion 10a of the screw shaft 10 is slidably engaged with the spline hole of the gear 5, and the gear 5 is supported rotatably with respect to the frame 1 and positioned in the axial direction. Therefore, the gear 5 is configured to be driven and rotated to have a sufficiently large inertial force, so that the gear 5 functions as a flywheel, and functions as a screw press that pushes the pressing block 4 downward.

When the gear 5 is stopped by acting as a screw press, the additional pressure mechanism 25 is operated to engage the clutch member 27 with the gear 5, and
When the gear 5 is driven by supplying the pressurized oil, the compounded material can be further pressurized. If necessary, this step may be repeated.

In the compression molding machine of the present invention, the female screw member 7 provided on the frame 1 receives a reaction force when the screw shaft 10 rotates during pressurization. Therefore, there is an advantage that the friction between the pressure block 4 and the guide 9 is small and the pressure efficiency is good, the height of the molding machine itself can be reduced, the durability is good, and the price is low.

[0023]

The present invention is configured as described above, and can provide the following excellent effects. (1) The plunger is driven by the cylinder to perform compression molding, and the compression molding can be efficiently performed using the inertia force of the simultaneously driven gear. (2) Further, the compression molding in the second stage can be performed by operating the additional pressure mechanism on the gear. (3) Since the cylinder is used, the amount of hydraulic oil is small and work is easy. (4) Therefore, the two-stage compression molding operation can be easily performed in a short time, and the molding quality is improved.

[Brief description of the drawings]

FIG. 1 is an overall sectional view of a compression molding machine showing an embodiment of the present invention.

FIG. 2 is a plan view showing an example of an additional pressure mechanism shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Frame 3 ... Cylinder 4 ... Pressure block 5 ... Gear 6 ... Support base 7 ... Female screw member 9 ... Guide 10 ... Screw shaft 12 ... Flange 15 ... upper plunger 25 ... additional pressure mechanism 26 ... drive cylinder 27 ... clutch member

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4E090 AA01 AA06 AB01 AB04 BA10 BB01 CC04 HA06 4G054 AA05 AC10 BA03 BA63 BA65 BA74 4K018 CA17

Claims (3)

[Claims] 1. A compression molding machine using a screw press for performing a compression process by moving a pressure block (4),
One end of a screw shaft (10) screwed to a female screw member (7) fixed to the frame (1) is attached to a pressure block (4) slidably provided on the frame (1). The end is slidably mounted in the axial direction on a gear (5) for driving the screw shaft (10), and the gear (5) is rotatably and axially mounted on the end of the frame (1). , A plurality of cylinders (3) are mounted between the frame (1) and the pressure block (4), and an additional pressure mechanism (25) engaging and disengaging from the gear (5) is provided. A compression molding machine, which is provided. 2. The other end of the screw shaft (10) and the gear (5) are spline-fitted (10a), and a flange (12) formed at one end of the screw shaft (10) is a pressure receiving plate (13). The compression molding machine according to claim 1, wherein the compression molding machine is rotatably engaged with the pressure block (4) via a pin. 3. The additional pressure mechanism (25) includes a clutch member (27) engaged and disengaged from the gear (5) and a drive cylinder (26) for driving the clutch member (27). 2. The compression molding machine according to 1.