JPH0481299A - Screw press apparatus - Google Patents

Abstract

PURPOSE:To reduce number of idle forming times and to improve productivity of a screw press-apparatus by arranging an auxiliary fly wheel as vertically shiftable always rotated at upper part of a fly wheel and energizedly rotating the fly wheel with this. CONSTITUTION:By descending the auxiliary fly wheel 9, friction disks 8, 12 are brought into close contact and the fly wheel 6 is energizedly rotated with the auxiliary fly wheel 9, and at the same time, by extension-operating a hydraulic cylinder 18, a pressure block 2 is descended. Then, even if the fly wheel 6 at the initial stage of pressurizing with a punch 2a releases rotating energy, by adding the rotating energy of auxiliary fly wheel 9, the fly wheel 6 is rotated, the pressure block 2 is descended until the rotating torque with friction transferring energy of both disks 8, 12 balances with resistant force to formation of powder body, and the formation without idle stroke is executed. When the pressurization completes, both disks 8, 12 are separated and the pressure block 2 is lifted with the hydraulic cylinder 18.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention moves a pressure block up and down with a hydraulic cylinder to rotate a vertical screw shaft that is screwed into a female screw attached to the pressure block in the forward and reverse directions. The present invention relates to an improvement in a screw press device that forms bricks and the like by applying impact pressure to a forming punch through the pressure block using the rotational energy of a flywheel fixed to the upper end of a shaft.

[Prior art] Such a device has been disclosed in Japanese Patent Application Laid-Open No. 62-33097 by the present applicant.
It has been proposed in the Publication No.

[Problems to be Solved by the Invention] The above proposal itself is effective, but when pressurizing bricks, etc., in the initial pressurizing stage, the flywheel must be rotated for each impact press, as in the conventional friction press. Since rotational energy is released, at least the first
From the first to the third impact pressurization, it is necessary to move the pressure block up and down until the object to be pressurized has a certain degree of density. occurs. However, after the 4th impact and pressure, the pressure block begins to receive repulsive force from the pressurized object, and the rhythmic impact and pressure is repeated, and from the 7th time when the final dimension is obtained, it is 0.1mm. Although a molded product of a specified size is obtained by repeating pressurization to a unit molding thickness, the number of idle moldings described above results in loss time and reduces productivity.

An object of the present invention is to provide a screw press device that reduces the number of idle forming operations and improves productivity.

[Means for Solving the Problems] According to the present invention, a pressure block is moved up and down by a hydraulic cylinder, and a vertical screw shaft that is screwed into a female thread attached to the pressure block is rotated in a forward and reverse direction. In a screw press device that forms bricks, etc. by impacting and pressurizing a forming punch through the pressure block using the rotational energy of a flywheel fixed at the upper end, the flywheel, which is constantly rotating above the flywheel, is movable up and down. A friction disk is provided opposite each of these flywheels, and a vertical movement device for the auxiliary flywheel is provided.

It is preferable that a drive disk that is locked in the rotation direction of the auxiliary flywheel and urged upward is provided, and that the drive disk is provided with a friction plate.

The vertical movement device includes a roller that holds the flange portion of the drive disk from above and below, a roller holder that holds the roller and is movable up and down in the device body, and a hydraulic pressure installed in the device body that moves the roller holder up and down. It is preferable to configure it with a cylinder.

[Function] In the screw press device configured as described above, when pressurizing during molding, the vertical movement device is activated to bring both friction disks into close contact, the auxiliary flywheel urges the flywheel to rotate, and at the same time Extend the hydraulic cylinder and lower the pressure block.

At the beginning of pressurization, even if the flywheel releases rotational energy, the flywheel rotates without stopping due to the addition of rotational energy from the auxiliary flywheel, and the rotational torque due to the frictional conduction energy of both friction disks increases the rotational torque of the powder. The pressure block descends until it balances with the resistance force to be formed, and forming is performed similar to that without the idle stroke, which is an advantage of hydraulic presses and the like. At this time, the auxiliary flywheel facilitates and speeds up the reversal of the flywheel when the pressure block moves from ascending to descending.

[Example] The present invention will be described in detail below with reference to the drawings.

In the figure, guide rails la and lB are provided inside a frame 1 of a screw press device, and a pressure block 2 is provided on these guide rails 1asla so as to be slidable up and down. A punch 2a is fixed to the lower surface of the pressure block 2, and cooperates with a goo (not shown) provided at the lower part of the frame 1 to perform pressure forming.

On the top surface of this pressure block 2, there is a pair of zero dots 2.
A piston 1.8 a formed at the upper end of the rod 2 b is housed in a hydraulic cylinder 8 . The hydraulic cylinder 8 is provided with hydraulic pressure supply boats (not shown) at the upper and lower ends, and hydraulic pressure from a hydraulic control device (not shown) is applied to the pressure block 2 via the piston 18a.
is designed to be driven up and down.

Also, on the center line of the pressure block 2, there is a female screw 2.
c is fixedly installed. A screw shaft 4 is provided to be screwed into the female thread 2c, and the upper portion of the screw shaft 4 is rotatably supported by the frame 1 via a bearing 5 and flanges 4a and 4b formed on the shaft 4.

A flywheel 6 is keyed to the upper part of the screw shaft 4, and is fixed to the upper flange portion 4a with a nut 7. A ring-shaped lower flickering disk 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, a bearing 40%
An auxiliary flywheel 9 is rotatably supported via 4C. The auxiliary flywheel 9 is constantly rotated by a motor (not shown) through a plurality of pulley grooves 9a.

A ring-shaped drive disk 11 is suspended from the lower surface of the auxiliary flywheel 9 by a plurality of pins 10 and a spring 10a that urges the disk 1-1 upward.

An upper flick john disc 12 is provided on the lower surface of the drive disc 11, facing the lower flick john disc 8 with a small gap therebetween, and a flange portion 11. a
A plurality of (at least four) vertical movement devices 13 are provided between the frame 1 and the frame 1 at equal intervals around the circumference.

The disk vertical movement device 13 includes a roller 14.14 that clamps the flange portion 11a, a roller holder 15 that holds the rollers 14.1-4 and is vertically movable on a guide bracket 16 erected on the frame 1. It is composed of a hydraulic cylinder 17 that moves a holder 15 provided on the frame 1 up and down. By driving the hydraulic cylinder 17 up and down, both the flick john disks 8 and 12 are brought into close contact with each other or separated from each other.

During molding, when applying pressure, both disks 8 and 12 are brought into close contact with each other, and the auxiliary flywheel 9 urges and rotates the flywheel 6, and at the same time, the hydraulic cylinder 18 is extended and the pressure block 2 is lowered.

In the initial stage of pressurization, even if the flywheel 6 releases rotational energy, the flywheel 6 rotates without stopping due to the addition of rotational energy from the auxiliary flywheel 9, and the friction between both flick john disks 8.1-2 increases. The pressure block 2 is lowered until the rotational torque due to the conducted energy is balanced with the resistance force of the powder to be molded, and molding similar to that without an idle stroke, which is an advantage of a hydraulic press, becomes possible.

Once pressurization is complete, both flick john discs 8.12
, and the pressure block 2 is raised by the hydraulic cylinder 18 in preparation for the next pressurization.

Even if the density of the material to be molded increases and it becomes pressurized with repulsive force, more effective molding is possible by adding the rotational energy of the auxiliary flywheel 9. During pressure molding with a molding time of about seconds,
Closest packing can be achieved by performing pressure impact with the auxiliary flywheel 9 separated from the flywheel 6. That is, the auxiliary flywheel 9 releases rotational energy in several seconds, but its peak pressing force is small, and the flywheel 6 releases its rotational energy in 0.1 to 0.2 seconds, and its peak pressing force is large. What is required for powder molding is
The present invention is characterized by repeating an initial pressurizing force with a large total amount of energy and a final peak pressurizing force, and having both of these pre-pressures.

In contrast, when powder is formed using a screw press that releases energy in one stroke, the first three
The powder does not harden until ~4 times, so the filling depth is 200m.
To obtain a molded product with a thickness of 100 mm, the molding thickness is approximately 60 mm in the first molding, approximately 20 mm in the second molding, approximately J-Omm in the third molding, and approximately 5 mm in the fourth molding. decreases and releases all the energy in each pressurization stage, so it is necessary to repeat idle pressurization. Molding thickness: 105 mm (Only after leprosy, the molded body becomes resistant, so full-scale impact molding becomes effective.In short, molding is performed until the thickness of the molded brick is 105 mm < leprosy, A feature of the present invention is that the original screw molding is then performed.

[Effects of the Invention] Since the present invention is configured as described above, it is possible to reduce the number of times of idle molding and obtain a molded product with higher density with a smaller number of times of pressurization, thereby improving productivity.

Furthermore, when the pressure block moves from rising to falling during molding, the flywheel can be reversed more easily and quickly by the auxiliary flywheel, contributing to the above effect.

[Brief explanation of the drawing]

The figure is a side sectional view showing one 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 john disk 13...Vertical movement device 18...Hydraulic cylinder

Claims (1)

[Claims] The pressure block is moved up and down by a hydraulic cylinder, and a vertical screw shaft that is screwed into a female thread attached to the pressure block is rotated forward and backward, and the pressure block is moved by the rotational energy of a flywheel fixed to the upper end of the screw shaft. In a screw press device that forms bricks, etc. by impacting and pressurizing an intermediary forming punch, a flywheel that constantly rotates is provided above the flywheel so as to be movable up and down, and friction disks are provided respectively opposite to both flywheels. With,
A screw press device comprising a vertical movement device for the auxiliary flywheel.