JP2654734B2 - Metal chip volume reduction machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a rotary screw shearing type metal chip volume reduction machine which crushes various shapes of metal chips generated when a metal material is machined to prevent an increase in storage volume. In this regard, a control circuit that feeds metal chips to the opposing centers of a pair of opposing screws to improve the compressive shearing ability and prevent heat generation of the motor due to overload such as clogging and frequent stoppage of operation. The present invention relates to a metal chip volume reduction machine provided with a metal chip.

[0002]

2. Description of the Related Art As a device for mechanically pulverizing metal chips of various shapes generated when a metal material is machined, the metal chips are pulverized by the shear force generated by the engagement between a shear blade attached to a rotor shaft and a fixed blade. Proposed to facilitate the grinding of soft material chips (Japanese Patent Publication No. 61-7335)
Have been.

[0003] Further, a rotary shaft disposed on a central shaft in the casing, a screw formed in a transport region on the base end side of the rotary shaft to feed the chips, and a radially outwardly directed shear region on the distal end side of the rotary shaft. A shear blade protruding into the casing, a fixed blade provided on the inner peripheral surface of the casing, and a discharge port formed in the casing, sending chips with a screw to one end in the casing, and metal chips with the fixed blade and the shear blade. There has been proposed a shearing apparatus configured to perform shearing and pulverization (Japanese Utility Model Laid-Open No. 3-65643).

[0004] In such a device, when sending entangled chips, the chips are sent while being loosened by the concave portion provided on the blade of the screw and the dispersing fixed blade provided on the inner peripheral surface of the casing.
A configuration improved so as not to apply an unreasonable load in the shearing region has also been proposed (Japanese Utility Model Laid-Open No. 9213/1992). In addition, in order to perform preliminary shearing in the transport area of the screw provided on the rotating shaft in the casing, a configuration in which a fixed blade for preliminary shearing is provided on the inner peripheral surface of the casing in the transport area is also proposed (Japanese Utility Model Application Laid-Open No. 4-9248).
No.). Furthermore, in order to discharge in advance metal chips that do not require a crushing process, a configuration in which a discharge port dedicated to the metal chips is provided in a transport area of the casing has been proposed (Japanese Utility Model Laid-Open No. 4-9249).

[0005]

A conventional rotary screw shearing type metal chip crushing apparatus has one end in a casing as a shearing area, feeds it to a shearing area via a conveying area from the other side, and connects the fixed blade with the shearing area. Due to the configuration of pulverization with the blade, the thrust force acting on the rotating shaft provided with the screw is in one direction, the load balance as a whole device is poor, and there is a problem that one bearing of the rotating shaft is damaged early. .

Further, when the amount of metal chips in the above-mentioned shearing region increases and the load on the motor that rotates the rotating shaft increases, the motor is prevented from being overheated and damaged due to overheating. Is detected, the motor is reversed, the shearing is performed again, and a safety device for detecting overheating of the motor with a temperature sensor and shutting off the power is provided (actually disclosed in Japanese Utility Model Application Laid-Open No. 4-5464).
No. 9), however, there is a problem that the operation efficiency is greatly reduced because the motor cannot be restarted until the overheated motor is cooled.

Further, the conventional crushing apparatus has a structure in which metal chips are fed from one of the rotating shafts to the other, and a discharge port for previously discharging metal chips that do not require crushing processing is provided in a transport area. Therefore, it is necessary to provide a shooter in the entire lower part of the crushing device, and adopt a built-in type structure that is so-called built-in to general-purpose machine tools etc. because of frequent stop due to thermal trip of the motor and long stop time etc. I couldn't do that.

In view of the present situation of a rotary screw shearing type metal chip volume reducer which crushes metal chips to prevent an increase in the storage volume, the present invention has a structure in which the load balance of the entire apparatus is good and the durability is improved. The object of the present invention is to provide a metal chip volume reduction machine that adopts a countermeasure against motor overload that does not involve frequent stopping due to a thermal trip of the motor and that can be built into a general-purpose machine tool or the like.

[0009]

According to the present invention, a pair of rotating shafts having different rotation directions are provided on a rotating shaft which is rotatably supported by rotating at least both ends in a horizontal cylindrical body having an open upper surface and driven by a motor. A screw blade is arranged oppositely, metal chips can be fed into the center of the rotating shaft, a push blade is protruded at the center of the rotating shaft, and a fixed blade paired with this is provided on the main body side, and the center of the rotating shaft is A metal chip volume reduction machine characterized in that a large number of discharge holes are perforated and arranged on a lower portion of the body and its vicinity.

Further, according to the present invention, in the above configuration, the motor is stopped when a driving current equal to or greater than a preset current value is input, the motor is driven in reverse for a predetermined time after a predetermined idle time, and the motor is restarted. A power cut-off unit that has a reversal control unit that stops the motor and drives the motor to rotate normally after a predetermined idle time. It is a metal chip volume reducing machine characterized by having a control means.

In the present invention, as long as a shearing region can be set at the center and a conveying screw region to the center at both sides of the shearing region, the shape of the screw and the structure of the shearing region at the center can be any known structure. Can also be adopted. In addition, the reversing control means and the power cutoff control means include an idle time for confirming the motor stop between the forward and reverse rotations to protect the motor from abrupt forward and reverse rotations. In this case, any configuration that does not stop the device can be adopted using a known electric element, circuit, or mechanical element.

[0012]

The operation of the metal chip volume reducing machine according to the present invention will be described in detail with reference to the drawings. 1 is an explanatory top view of a metal chip volume reducing machine according to the present invention, FIG. 2A is an explanatory longitudinal sectional view taken along line AA of FIG. 1,
FIG. 2B is a vertical sectional view taken along the line BB of FIG. FIG. 3 is a flowchart showing a control circuit of a motor of the metal chip volume reducing machine. Here, the configuration is based on the assumption that a metal chip volume reduction machine is built in at the lower part of a machine tool such as a general-purpose lathe,
The main body of the volume reducing machine comprises a cylindrical main body 1 having a horizontal arrangement, an open upper surface, and a hand-entry chute. Bearings 2 and 3 are provided at both ends of the main body 1 so that the rotating shaft 4 can rotate freely. A motor 5 having a speed reducer is attached to one of the bearings 2 in-line so that the rotary shaft 4 can be driven. A pair of screw blades having different rotation directions are arranged on the rotating shaft 4 to face each other, that is, right-handed and left-handed screw blades 6 and 7 are fixed to the rotating shaft 4 symmetrically from the center, and the screw blades 6 and 7 face each other. It is configured so that metal chips can be sent to the center side. The inner diameter of the cylindrical main body 1 is provided with a predetermined clearance from the inner peripheral surface of the main body 1 so that the rotating shaft 4 having the screw blades 6 and 7 can freely rotate. The pitch and shape of the screw blades 6 and 7 are appropriately selected according to the shape and size of the metal chips.

Further, in the shearing region at the center of the rotating shaft 4,
A pair of push-cutting blades 8 and 9 are protruded, and a pair of fixed blades 10 is provided on the main body 1 side. The above rotating shaft 4
A large number of discharge holes 11 are drilled and arranged in the central portion of the main body 1 and the lower surface of the main body 1 in the vicinity thereof. The shape, size and arrangement range of the discharge hole 11 are determined in consideration of the above. In addition, although the discharge hole 11 is circular in the drawing, various configurations such as an elliptical shape, a square shape, a deformed hole, or a combination of a circular shape and a square shape can be adopted.

The rotating shaft 4 rotates at a preset number of revolutions, and metal chips of various shapes dropped from the upper part of the main body 1 are firstly rotated by the rotating screw blades 6 and 7 at the center of the rotating shaft 4. It is sequentially fed into the shear zone and compressed. Even in the transfer area, the metal chips are crushed by the screw blades 6 and 7 and the inner peripheral surface of the main body 1, and the metal chips caught on the discharge holes 11 near the shearing area are removed by the edges of the screw blades 6 and 7 and the discharge holes 11. And is compressed into a shearing region while being crushed.

In the shearing region at the center of the rotating shaft 4, metal chips are sequentially fed and compressed, and are sheared and pulverized by the pushing blades 8, 9 and the fixed blade 10, and are discharged from the discharge hole 11,
It is collected in a predetermined chip collection box from a shooter provided at the lower part of the cylindrical body 1.

The motor 5 may be overloaded due to too much or entangled metal chips in the shearing region. The motor 5 is controlled by a forward / reverse rotation control circuit and an abnormal stop circuit as shown in FIG. A control device is connected to prevent a stop due to frequent thermal trips by the conventional control method, thereby enabling a long-time continuous operation.

That is, the forward / reverse rotation control circuit, when a drive current equal to or greater than a preset current value is input to the motor,
This is detected as overload, then the motor is stopped, and after a predetermined idle time, the motor is driven reversely for a predetermined time to reverse the screw, the motor is stopped again, and the motor is normally rotated after the predetermined idle time. Performs inversion control. This is repeated each time an overload is detected. In the present invention, the motor is stopped, and after a predetermined idle time, the operation is shifted to the next operation.
The motor is protected from the impact of sudden reversal.

The abnormal stop circuit counts the number of times of the above-mentioned reverse rotation driving operation, determines that the number of times of execution of the reversal control does not exceed the set number of times within a set unit time, and automatically determines that it is normal. Reset and normal operation. On the other hand, when the number of times of the reverse rotation drive exceeds the set number of times within the unit time, it is determined that there is an abnormality, and power cutoff control for turning off the power is performed. However, as in the conventional control, reversing is performed immediately after simply detecting overload, and overheating of the motor is detected by the temperature sensor and stopped, until the motor is overworked until the temperature sensor detects it and the motor cools down. Although reset recovery cannot be performed, in the case of the present invention, reversal is repeated within a range in which the motor does not overheat, so that even if the motor stops, reset recovery is possible immediately.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Using a metal chip volume reducing machine according to the present invention having the above-described structure shown in FIGS. , Blade thickness 9mm, pitch 175mm, outer diameter about 1
Provide a 40mm screw and attach it to the lathe machine,
When metal chips of about 50 to 1000 mm generated during the processing of ordinary steel were pulverized, processing of about 150 kg / hour was possible, and the motor did not stop due to thermal trip.

[0020]

According to the present invention, a screw having a different winding direction is provided symmetrically with respect to the center of the rotating shaft, and a shearing region is set at the center. The load balance is good, and the pair of screws collects the metal chips in the central shearing region and compresses and shears the metal chips so as not to be scattered. Furthermore, the transfer time is shorter and the throughput per unit time is increased, as compared with the conventional case where the sheet is transferred in one direction and then sheared. In addition, since a discharge port provided with a large number of discharge holes is provided in the vicinity of the shearing region in the center, a metal chip in the middle of conveyance can be pulverized by the discharge holes and the screw, and the shearing efficiency is further improved. According to the present invention, the motor is stopped during the inversion control, and the operation is shifted to the next operation after a predetermined idle time, so that the motor is protected from an impact caused by a sudden inversion, and the number of times of execution of the inversion control is set to a set unit time. As long as it does not exceed the set number of times, it will be judged as normal and automatically reset, and normal operation will be performed, so there is no decrease in operating efficiency due to frequent stoppages as in the past, and reversal within the range where the motor does not overheat. It is repeated, so that even if it stops, it is possible to immediately return from reset.

[Brief description of the drawings]

FIG. 1 is an explanatory top view of a metal chip volume reducing machine according to the present invention.

FIG. 2A is a longitudinal sectional view taken along the line AA of FIG. 1, and FIG.
-It is a B line longitudinal section explanatory drawing.

FIG. 3 is a flowchart showing a control circuit of a motor of the metal chip volume reducing machine according to the present invention.

[Explanation of Signs] 1 Main body 2, 3 Bearing part 4 Rotary shaft 5 Motor 6, 7 Screw blade 8, 9 Push cutting blade 10 Fixed blade 11 Discharge hole

Claims (2)

(57) [Claims] 1. A pair of screw blades having different rotation directions are arranged opposite to each other on a rotating shaft driven by a motor rotatably supported at least on both ends in a horizontal cylindrical body having an open upper surface. Metal cutting chips can be fed into the center of the shaft, and a push blade is protruded from the center of the rotating shaft and a fixed blade that is paired with the pushing blade is provided on the main body side. A metal chip volume reduction machine characterized in that a large number of discharge holes are arranged. 2. A motor stops when a drive current equal to or greater than a preset current value is input, reversely drives the motor for a predetermined time after a predetermined idle time, stops the motor again, and after a predetermined idle time. It has inversion control means for driving the motor to rotate normally, and has power cutoff control means for shutting off the power so as to be able to return to reset when the number of executions of the inversion control exceeds the set number within a set unit time. The metal chip volume reducing machine according to claim 1, wherein