JPH0698511B2 - Screw press equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention moves a pressure block up and down by a hydraulic cylinder to rotate a vertical screw shaft screwed into a female screw mounted on the pressure block in the forward and reverse directions, The present invention relates to an improvement of a screw press device that impacts and presses a molding punch through the pressure block by the rotational energy of a flywheel fixed to the upper end of a shaft to mold bricks and the like.

[Prior Art] Such an apparatus has been proposed by the present applicant in, for example, JP-A-62-33097.

Although the above proposal itself is effective, however, when pressurizing bricks and the like, the rotational energy of the flywheel is released at each initial pressurization stage, as in the conventional friction press, for each impact pressurization. At least first
From the third time to the third impact pressure, it is necessary to repeat the so-called idle molding pressure until the pressure block moves up and down and the object to be pressurized has a certain density, resulting in a time loss. . However, after the fourth pressurization and pressure, the pressure block receives repulsive force from the object to be pressed, and rhythmical percussion and pressurization is repeated. From the seventh press which gives the final dimension, 0.1mm unit While the pressurization of the molding thickness is repeated to obtain a molded product having a specified size, the idle molding circuit causes a loss of time and the productivity is reduced.

Further, Japanese Patent Publication No. 46-33276 discloses a screw press for moving a screw wheel to a driving wheel that is constantly rotating to move a screw shaft downward. However, in such a known technique, the screw shaft is held as a sleeve, and by stopping the sleeve, the screw shaft moves up and down.
The impact force is small or the gravity of the flywheel cannot be used.

[Problems to be Solved by the Invention] Therefore, an object of the present invention is to provide a screw press device capable of reducing the number of idle moldings, utilizing the weight of a flywheel and the like, and obtaining a high impact force. It is in.

[Means for Solving the Problem] According to the present invention, a female screw (2c) equipped with a frame (1) and a pressure block (2) moved up and down by a hydraulic cylinder (18) is attached to the pressure block (2). A vertical screw shaft to be screwed is rotated normally and reversely, and the forming punch (2a) is hit through the pressure block (2) by the rotational energy of a flywheel (6) fixed to the upper end of the screw shaft (4). In a screw press device for pressurizing bricks or the like, the screw shaft (4) is rotatably supported by a frame (1) via a bearing (5), and a flywheel is provided above the screw shaft (4). (6) is integrally fixed, a lower friction disc (8) is provided on the upper surface of the flywheel (6), and the screw shaft is further provided. An auxiliary flywheel (9), which is constantly rotated by a motor, is rotatably supported on the upper part of (4) via a bearing (4c), and a drive disk (11) for the auxiliary flywheel (9).
And an upper friction disc (12) facing the lower friction disc (8) on the lower surface of the drive disc (11). A plurality of vertical movement devices (13) are provided between the flange portion (11a) extending in one direction and the frame (1).

[Explanation of Action and Effect] Therefore, during molding, the auxiliary flywheel is always rotated around the screw shaft by the motor, and therefore the flange portion of the drive disk is also supported and rotated by the vertical movement device. Then, when pressurizing, the drive disc is moved downward by the vertical movement device so that the upper and lower friction discs are engaged with each other, the auxiliary flywheel imparts rotational energy to the flywheel, and thus the screw shaft moves the pressure block downward. . At the same time, the hydraulic cylinder is extended to lower the pressure block. The pressurizing operation is performed in this manner, but the pressure block descends on the screw shaft until the rotational torque due to the frictional conduction energy of both friction disks balances with the powder forming resistance force.
Therefore, molding without an idle stroke is possible.

Further, if necessary, it is possible to perform the pressure hit with the flywheel separated from the auxiliary flywheel.

As described above, according to the present invention, the pressing force of the hydraulic cylinder and the shocking energy of the combination of the flywheel and the screw can be used at the same time. In particular, since the screw shaft is rotatably provided in the middle of the screw shaft and the lower end is screwed into the pressure block, the rotation of the screw shaft directly moves up and down of the pressure block without floating. , The energy of the flywheel can be fully utilized. In addition, the drive disc and the friction disc of the flywheel can provide sufficient rotational force, and slip occurs when the powder molding resistance and rotational torque balance, so unnecessary stress is applied to the screw shaft and other parts. It is not applied and acts as a safety device. Therefore, the life of the entire device can be extended.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

In the figure, guide rails 1a, 1a are provided inside a frame 1 of the screw press device, and a pressure block 2 is provided on the guide rails 1a, 1a so as to be vertically slidable. A punch 2a is fixed to the lower surface of the pressure block 2, and pressure molding is performed in cooperation with a die (not shown) provided in the lower portion of the frame 1.

On the upper surface of this pressure block 2, a pair of rods 2
The pistons 18a formed on the upper end of the rod 2b, in which b and 2b are erected, are housed in the hydraulic cylinder 18. The hydraulic cylinder 18 is provided with hydraulic pressure supply ports (not shown) at the upper and lower ends thereof, and the pressure block 2 is driven up and down via a piston 18a by hydraulic pressure from a hydraulic control device (not shown).

Also, on the center line of the pressure block 2, a female screw 2c
Is fixed. A screw shaft 4 that is screwed into the female screw 2c is provided, and the upper portion thereof is rotatably supported by the frame 1 via bearings 5 and flange portions 4a and 4b formed on the shaft 4.

A flywheel 6 is keyed to the upper portion of the screw shaft 4 and is fixed to an upper flange portion 4a with a nut 7. A ring-shaped lower flick disc 8 is fixedly mounted on the upper surface of the flywheel 6.

On the other hand, at the upper end of the screw shaft 4, bearings 4c, 4c
An auxiliary flywheel 9 is rotatably supported via. The auxiliary flywheel 9 has a plurality of V pulley grooves.
The motor 9a is always rotated by 9a.

On the lower surface of the auxiliary flywheel 9, a ring-shaped drive disk 11 is suspended by a plurality of pins 10 and a spring 10a for urging the disk 11 upward.

An upper flick disc 12 is provided on the lower surface of the drive disc 11 so as to face the lower flick disc 8 with a small gap therebetween, and a plurality (at least four) are provided between the flange portion 11a and the frame 1. Vertical movement device 13
Are evenly distributed around the circumference.

The disk vertical movement device 13 holds the rollers 14 and 14 that hold the flange portion 11a and the rollers 14 and 14, and the guide bracket 16 that is erected on the frame 1 allows the vertical movement of the roller holder 15 and the frame 1. It is composed of a hydraulic cylinder 17 for moving the provided holder 15 up and down. Then, by driving the hydraulic cylinder 17 up and down, the two flick disks 8, 12 are brought into close contact with or separated from each other.

During molding, at the time of pressurization, the disks 8 and 12 are brought into close contact with each other, and the flywheel 6 is urged and rotated by the auxiliary flywheel 9, and at the same time, the hydraulic cylinder 18 is extended to lower the pressure block 2.

Even when the flywheel 6 releases rotational energy in the initial stage of pressurization, the flywheel 6 rotates without stopping due to the addition of rotational energy of the auxiliary flywheel 9, and the frictional conduction energy of both flick discs 8 and 12 is increased. The pressure block 2 descends until the rotational torque due to is balanced with the resistance force of the powder to be molded, and it is possible to perform similar molding without the idle stroke which is an advantage of a hydraulic press or the like.

When the pressurization is completed, the flick disks 8 and 12 are separated from each other, and the hydraulic cylinder 18 raises the pressure block 2 to prepare for the next pressurization.

Even if the density of the object to be molded becomes large and the repulsive force is applied, the auxiliary flywheel 9 adds the rotational energy to enable more effective molding. At the time of pressure molding for a molding time of about a second, close packing can be obtained by performing a pressure impact with the auxiliary flywheel 9 separated from the flywheel 6. That is, the auxiliary flywheel 9 releases the rotational energy in a few seconds, but its peak pressing force is small, and the rotational energy of the flywheel 6 is released in 0.1 to 0.2 seconds, and the peak pressing force is large. What is required for powder molding is repetition of an initial pressing force with a large total amount of energy and a final peak pressing force, and it is a feature of the present invention that both of these pressing forces are combined.

On the other hand, when powder is molded by a screw press that releases energy in one stroke, the first three
The powder does not harden up to 4 times, so if you want to obtain a compact with a filling depth of 200 mm and a thickness of 100 mm, the first time about 60 mm,
The second thickness is about 20 mm, the third time is about 10 mm, and the fourth time is about 5 mm, the molding thickness is reduced, and all energy is released at each pressurizing step, so idle pressing Need to repeat. Only when the molding thickness reaches about 105 mm, the molded body becomes resistant for the first time, and then full-scale impact molding becomes effective. In short, the feature of the present invention is that the molded brick is molded to a thickness of about 105 mm at a time and then the original screw molding is performed.

[Effects of the Invention] As described above, the present invention has the following excellent effects.

(I) With the combination of the auxiliary flywheel and the flywheel, the rotational energy of the auxiliary flywheel is applied at the initial stage of pressurization and then the rotational energy of the flywheel is applied next, so that powder molding can be reliably performed. it can.

(Ii) It is possible to reduce the number of times of idle molding and obtain a molded product having a higher density with a small number of times of pressurization to improve productivity.

(Iii) Since the screw shaft is screwed into the pressure block, an impact force can be applied to the pressure block in combination with the action of the hydraulic cylinder.

(Iv) Therefore, the application of impact force and the application of rotational energy (2 by the flywheel and the auxiliary flywheel)
Is sufficiently effective for powder molding.

(V) With the friction disk, both imparting rotational force and safety against overstress can be satisfied.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention. 2 ... Pressure block, 2c ... Female thread, 4 ... Screw shaft, 6 ... Flywheel, 8 ... Lower friction disc, 9 ... Auxiliary flywheel, 11 ...
… Flange part, 12 …… Upper flick disc, 13
…… Vertical movement device, 18 …… Hydraulic cylinder

Claims (1)

[Claims] 1. A vertical screw shaft comprising a frame (1) for vertically moving a pressure block (2) by a hydraulic cylinder (18) to be screwed onto a female screw (2c) mounted on the pressure block (2). Rotate forward and reverse, and the flywheel (6) fixed to the upper end of the screw shaft (4) strikes and presses the forming punch (2a) through the pressure block (2) to form bricks or the like. In the screw press device, the screw shaft (4) is rotatably supported by a frame (1) via a bearing (5), and a flywheel (6) is integrally fixed to an upper portion of the screw shaft (4). , A lower friction disc (8) is provided on the upper surface of the flywheel (6), and a bearing (4c) is further provided on the upper part of the screw shaft (4). Auxiliary flywheel is rotated at a constant motor (9) is rotatably supported by, the auxiliary fly drive disc of the wheel (9) (11)
And an upper friction disc (12) facing the lower friction disc (8) on the lower surface of the drive disc (11). A screw press device, characterized in that a plurality of vertical movement devices (13) are provided between a flange portion (11a) extending in one direction and the frame (1).