JPS58116996A - Screw press - Google Patents

Abstract

PURPOSE:To improve pressure capacity and working speed by coupling an air motor provided with a piston-like rotor which moves upward and downward while rotating in a longitudinal cylinder integrally to a screw transmission mechanism of a screw press and acting the air pressure in the rotating direction in the ascending or descending stage of a ram, thereafter in ascending and descending directions. CONSTITUTION:While a ram 16 is in an ascending position, a selector valve 11 is operated to open the lower ports 7, 7 of an air motor 2 to the atmosphere and to connect upper ports 6, 6 to a compressed air source 12. Then, the compressed air supplied through the ports 6, 6, into the space 3 in a casing 4 collides against the upper vanes 8 of a rotor 5 and applies torque to the rotor 5, thereby rotating the same in the direction of a solid line arrow. Linear motion in a downward direction is then applied to a screw shaft 15, by which the ram 16 is moved downward. In this stage, the rotor 5 descends as well and the upper vanes 8 deviate downward from the upper parts 6; therefore, the compressed air presses the rotor 5 downward cooperatively with the already supplied compressed air. The rotating speed of the rotor 5 is increased by the effect of a screw shaft 15 threaded with multiple screws of a sharp spiral grade of a screw transmission mechanism 13 and the descending speed of the ram 16 is correspondingly increased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a screw press that utilizes the inertia of a flywheel.

By the way, there is a screw press in which a ram guided in the vertical direction and a flywheel rotating in a horizontal plane are connected by a screw transmission mechanism, and the rotational motion of the flywheel is converted into linear motion and transmitted to the ram.

Because it uses the inertia of the flywheel mentioned above to perform pressurizing work, it has unique pressurizing characteristics that are not found in other crank braces or drop hammers, and therefore it is still used in unique work fields. It has been awarded.

A well-known representative example of such a screw press is a nine-friction press that uses a friction wheel as a drive means for a flywheel. However, this 7-rection press is *
Because there is slippage 9 between the steering wheel and the 7rai wheels, there is a large loss of power, and the wear and tear of the frictional contact parts is severe.There is especially a lot of slippage at the start of driving, so the starting torque is small and acceleration performance is poor. bad. Since this 7-rection press is installed on the top of the friction wheel T-frame, the overall height is unavoidable, and the center of gravity is high and unstable, so it must be installed firmly. requires a foundation.

The present invention utilizes the pressure characteristics unique to screw presses as described above, addresses the above-mentioned problems with friction presses, and applies air pressure to the drive force of the flywheel in order to realize a small, high-performance screw press. Utilize this air pressure against the flywheel in the direction of rotation when the ram begins to move up and down.

After that, it is made to act in the upward and downward directions.

The embodiments shown in the drawings will be described in detail below.

In the figure, 1 is a frame, and 2 is an air motor having a pneumatic cylinder function, which is placed on the top of the frame. The air motor 2 consists of a casing 4 having a vertically closed cylindrical internal space 3, and a piston-like rotor 6 that moves up and down while rotating within the casing. Near the upper and lower ends of the peripheral wall of the casing 4, an upper boat 6 and a lower boat 6 for air supply and exhaust that communicate inside and outside are provided at least several times (two in the illustrated example), and around the rotor 6. , a large number of upper blades 8 and lower blades 9 are provided at equal angular intervals and separated by a partition plate IO. Further, each of the above-mentioned upper and lower boats 6 is connected to a compressed air source 12 via a switching valve 11, or is opened to the atmosphere. Reference numeral 13 denotes a screw transmission mechanism for converting the rotational motion of the rotor 5 into linear motion, which is composed of a nut-shaped bearing 14 having a female threaded portion in the center, and a vertical threaded shaft 15 having a male threaded portion. The bearing 14 is fitted into the upper center of the frame l, and the screw shaft 15 of the latter.

The upper end is integrally connected to the rotation center of the rotor 6, and when in good condition, it threadably passes through the bearing 14 and is suspended inside the frame. Also.

Each of the tiss threaded portions of the bearing 14 and the threaded shaft 15 is a multiple thread with a steep helical slope.

Also due to the axial load applied to the screw shaft 15.

Rotation of the shaft can be caused. on the other hand,#
The upper and lower blades 8.9 of the rotor 6 described above are arranged as follows in relation to the helical direction of each threaded portion described above. That is, the upper blade 8 applies rotation in the direction in which the screw shaft 15 descends to the rotor 6, and the lower blade 9 applies rotation in the direction in which the screw shaft 15 rises to the rotor 5. Therefore, each of the above When the screw part is right-handed, the upper blade 8 rotates clockwise when viewed from above.
In addition, the shape and orientation of the lower blades 8 are selected in order to impart counterclockwise rotation to the rotor 6, and accordingly, the orientations of the upper and lower boats 6.7 mentioned above are also selected. . ! Reference numeral 6 denotes a ram built into the frame 1, which is connected to the lower end of the screw shaft 16 to allow free rotation of the shaft, and includes guide rails on the inner surface of the frame.

It is designed to guide you up and down with the l-f.

A pair of upper and lower forging molds, an upper die 19a and a lower die 19b, are attached to the lower surface of the ram 16 and the upper surface of the nine-block 18 fitted into the inner bottom of the frame. By the way, in the embodiment shown in FIG. 1.2, the rotor 5 is of a flywheel type with a large diameter, so that the height of the air motor 2 can be reduced, although the overall size of the air motor 2 becomes larger.

On the other hand, in the embodiment shown in the FAS diagram, a rotor 5 and a separate flywheel 5' are used, and the two are integrally connected by an extension 15' of a screw shaft 15.

Unfortunately, the height is a little large, but the entire air motor 2 can be made smaller. It is preferable that the above-mentioned upper and lower boats 6 and M have a small-diameter nozzle shape in order to apply a strong rotational force to each blade 8.9 of the rotor 5, but the internal space 3
It is preferable to use a large diameter in order to facilitate exhaustion from the pipe. Therefore, if necessary, each of the upper and lower boats 6 and the boat may be divided into an air supply nozzle and an exhaust hole, and these may be opened and closed at any time by a multi-system switching valve.

In the above configuration, it is assumed that the ram 16 is now in a raised position as shown in FIG. At this time, by operating the switching valve 11, the lower boat 7 and the hood of the air motor 2 are opened to the atmosphere, and when the upper boat 6.6 is connected to the compressed air source 12, the casing number is changed from the latter boat 6.6. Internal space 3
The compressed air supplied to the rotor 5 impinges on the upper blade 8 of the rotor 5.

The air pressure applies torque to the rotor, causing the rotor 5 to rotate in the direction of the solid line arrow in FIG. Then, in the screw transmission mechanism using the right-hand screw shown in the figure, the rotational movement of the rotor 5 in the above direction gives a downward linear movement to the screw shaft 15, so that the ram 16 starts to descend. When the ram 16 begins to descend in this manner, the rotor 5 integrated with the screw shaft 15 also begins to descend within the case/gage 4, causing the upper blade 8 to come off below the height of the upper boat 6. The compressed air subsequently supplied from the boat, together with the compressed air already supplied, presses the rotor 5 downward with its air pressure. However, since the male and female threaded portions of the screw transmission mechanism 13 are multi-threaded screws with steep helical gradients, when a downward pressing force is applied to the rotor 6 as described above, the screw shaft 16 acts to rotate the rotor. The rotational speed increases and therefore the lowering speed of the ram 16 also increases. Also, at this time, the rotor 5. Screw shaft 15. The respective weights of the ram 16 and the forging upper die 19m also act downward, further promoting the above-mentioned increase in rotational speed and descending speed.

Therefore, if a workpiece material is placed on the lower forging mold 19b in advance, the material descends and is then pressurized by the next ram 16 through the upper forging mold 19a'i. The inertial force of the flywheel greatly contributes to this pressurization. That is, in the embodiment shown in FIG. 1.2, the inertial force of the rotor 5, which also serves as a flywheel, and in the embodiment shown in FIG. The force is transferred to the ram 16 instead of a downward pressing force, strongly pressurizing the material.

Note that after the ram 16 has descended in this manner.

This time, the switching valve 11 is operated in the opposite direction to open the upper boat 6.6 of the air motor 2 to the atmosphere and connect the lower boat 6.6 to the compressed air source 12.

Then, the compressed air supplied from the latter boat to the internal space 3 of the casing number initially applies its air pressure to the lower blades 9 of the rotor 6 to rotate the rotor in the direction of the chain arrow in FIG. Thereafter, the air pressure is applied upward to the rotor 5, and the rotor continues to rotate in the above direction by the action of the screw shaft 15. Therefore, the ram 16Fi returns upward from the lowered position to its original position, and at the same time, the rotor 5 also returns upward within the casing 4. However, in this case,
Rotor 5. Screw shaft 15. Since the weights of the ram 16 and the upper forging mold 19 act downward, the rising speed of the ram 16 and the like mentioned above is slower than the falling speed.

By the way, the air motor 2 as a means for rotating the screw shaft 15i has a larger starting torque and better acceleration performance than the friction contact drive means of a friction press.
The rotor 5, which also serves as a flywheel or is integrated with the flywheel 5', can be rotated with good startup speed, and the lifting speed of the ram 16, especially the lowering speed, can be increased. It is also possible to increase the inertial force of the flywheel applied as a means of applying pressure to the material, thereby increasing the ability of the ram 16 to apply pressure to the workpiece material and shortening the time required for processing.

Also, this air motor 2 has low mechanical efficiency in general, but compared to the above-mentioned frictional contact drive means, it has low mechanical efficiency.
There is no power loss corresponding to this slippage, and the compressed air acting on the rotor in the rotational direction is also applied in the vertical direction of the rotor, so there is no wastage of compressed air and mechanical Efficiency is surprisingly good, so Ram 16
The pressurizing capacity per unit power consumption can be increased7.Furthermore, since the air motor 2 is smaller in vertical height and weight than the friction drive means of a friction press, the overall height of the screw press can be increased. 1 by lowering the height and lowering the center of gravity.
The stability of the press can be increased to such an extent that a strong foundation is not required.

Therefore, according to the present invention as described above, it is possible to provide a small, high-performance screw press that has a higher pressurizing capacity, a faster processing speed, and a smaller overall height than the conventional 7-reaction press. Because of the high cost, the installation can be expected to have effects such as simplifying the foundation. Further, according to the present invention, the compressed air supplied to rotate the rotor at the beginning of the lifting/lowering operation of the ram;
The compressed air supplied afterwards is used in the direction of raising and lowering the ram, and since the helical slope of the threaded part of the screw transmission mechanism is large, it is not possible to force it to move up and down each lifting member from the rotor to the ram. Particularly when the ram is rising, the downward weight of each elevating member including the ram is offset by the upward air pressure acting on the rotor, and the threaded transmission mechanism is Is there a TL that can reduce the burden on IM reception?

Since there is no need for intermediate friction contact parts that are subject to severe wear and tear as seen in fly/yo/presses, it can be expected that the durability of the screw press can be greatly improved.

[Brief explanation of the drawing]

Fig. 1 is a cutaway front view of main parts showing an embodiment of the present invention, Fig. M2 is a cross-sectional view taken along the Moum line in Fig. 1, and Fig. 3 is a cutaway front view showing main parts of another embodiment. It is. 1.-frame frame, 2.-air motor, 3.-internal space, 4.-sink, b.-rotor, 6.-upper port, 7.-lower boat, 8.-・Upper blade, 9-・
Lower blade, 13... screw transmission mechanism, 14 - bearing, 1
5...Screw shaft, 16...Ram Applicant: Otani Machinery Co., Ltd.

Claims (1)

[Claims] (1) A screw transmission mechanism is provided at the top of the frame, and consists of a nut-shaped bearing and a vertical screw shaft that screws through the cough bearing and hangs down into the frame, and that the screw transmission mechanism is installed on the top of the frame, and that it can be rotated up and down within the 7 frames. In an arrangement in which a ram guided in the direction is connected to the lower end of the screw shaft to allow free rotation of the shaft, a vertical cylindrical internal space is provided on the top of the frame. An air motor consisting of a casing having a casing and a piston-like rotor that can move up and down while rotating within the space is disposed, and the rotor is integrally attached to the upper end of the screw shaft while serving as a flywheel or being integrated with the flywheel. K near the upper and lower ends of the peripheral wall of the casing are provided with one or several upper boats and lower boats for air supply and exhaust, and around the rotor are provided a wrinkled rotor that gives downward rotation to the rotor. It is characterized in that it is provided with a large number of upper blades and a plurality of lower blades that provide upward rotation, and that each of the above-mentioned nut-shaped bearings and threaded portions of the threaded shaft are multi-threaded screws with steep spiral slopes. screw press.