WO2023058380A1

WO2023058380A1 - Material feed device for cutting machine

Info

Publication number: WO2023058380A1
Application number: PCT/JP2022/033271
Authority: WO
Inventors: 博康塩川; 剛木村
Original assignee: 株式会社万陽
Priority date: 2021-10-05
Filing date: 2022-09-05
Publication date: 2023-04-13
Also published as: JP7335471B1; JPWO2023058380A1

Abstract

Provided is a material feed device for a cutting machine in which materials are fed by using a plurality of feed rollers, and the material feed device does not use a rotation transmission mechanism such as a chain and a belt for driving the feed rollers.　Under a normal load, the rotation of an output shaft 62 of a reduction gear-equipped motor 6 is transmitted to a feed roller 4 via a drive shaft 5, a sleeve 51, and friction plates 41, 41, whereby a bar material 31 is fed into a cutting machine 1. In the case where an overload acts on the feed roller 4, the feed roller 4 rotates relative to the friction plates 41, 41 due to slippage therebetween, whereby it becomes possible to prevent an overload acting on the output shaft 62 of the reduction gear-equipped motor 6.

Description

Cutting machine material feeder

The present invention is used when cutting round bar-shaped steel materials, etc., and relates to a material supply device for a cutting machine using feed rollers. More specifically, in this material supply apparatus, it relates to a material supply apparatus for a cutting machine in which a feed roller is directly driven by a motor.

When manufacturing automobile parts, etc., cut steel rods are used as forging materials. At this time, a dedicated cutting machine is used to cut the round bar by shearing, and a supply device for continuously supplying the round bar to this cutting machine is known. In order to supply the round bars to the cutting machine in the axial direction, the applicant separates the round bars from the stocker one by one and then places them on a feed roller device having a V-shaped cross section to cut the round bars. (Patent Document 1). This roller device has a plurality of feed rollers arranged in the longitudinal direction (axial direction) of the round bar, and the plurality of feed rollers are connected by a chain and driven by a single motor. is. On the other hand, in industrial machinery, when a load is rotationally driven by a motor, a compact motor with a speed reducer is known and used, in which the motor and the speed reducer are integrally structured. By using a speed reducer, it is possible to efficiently obtain a high-torque rotation output at a low speed so that even heavy objects can be conveyed.

JP-A-5-24643

In order to drive multiple feed rollers with a single motor, it is necessary to interlock the feed rollers with a chain or the like, which makes the power transmission structure complicated and requires complicated maintenance in dusty environments. be. In addition, from the viewpoint of securing the safety of workers, it is desirable to use a rotation transmission mechanism such as a chain or belt. However, in a cutting machine that frequently repeats start, stop, acceleration, etc. for cutting a round bar, even if the drive of each feed roller is replaced by a roller rotation drive motor, due to the inertia of the round bar, the inertia of the motor, etc., If an excessive load is applied and the motor with a reduction gear has a small output, the gear inside the reduction gear will be damaged.
The present invention was developed against such a background, and achieves the following objects.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a material feeding device for a cutting machine that does not use a rotation transmission mechanism such as a chain or belt to drive the feed rollers in the cutting machine that feeds materials through a plurality of feed rollers. .
Another object of the present invention is to prevent overload acting on the output shaft of the motor due to the inertia of material transfer in a cutting machine that feeds materials by a plurality of feed rollers, in which the feed rollers are directly driven by a motor. A material feeder for a cutting machine is provided.

In order to solve the above problems, the present invention employs the following means.
That is, the material supply device for a cutting machine of the first aspect of the present invention includes a base and a plurality of feeders rotatably supported by the base for feeding the long material in the axial direction to the cutting machine for cutting the long material. In a material supply device for a cutting machine in which rollers are arranged, a feed roller rotation drive motor having an output shaft directly connected to the drive shaft of the feed roller and between the drive shaft of the feed roller and the output shaft It is characterized by comprising an overload protection device that is interposed and limits the output torque of the feed roller rotation drive motor.

A second aspect of the present invention is a material supply device for a cutting machine according to the first aspect, wherein the feed roller rotation drive motor is controlled in start, stop, and rotation speed by an inverter control device, and the rotation of the feed roller rotation drive motor is controlled by an inverter control device. The motor is characterized by being a motor with a speed reducer having a speed reducer.
A third aspect of the present invention is the material supply device for a cutting machine according to the second aspect, wherein the overload protection device is arranged between the side surface of the feed roller and the drive shaft of the feed roller so as to be relatively rotatable, and is supported by a spring. It is characterized by comprising a friction plate that presses against the side surface.
A material supply device for a cutting machine according to a fourth aspect of the present invention is the material supply device for a cutting machine according to the second or third aspect of the present invention, wherein a detent plate is fixed to the pedestal corresponding to the motor with a speed reducer; and a detent pin that engages with the through hole of the decelerator of the attached motor to detent the decelerator.

In the material supply device of the cutting machine of the present invention, when an overload torque acts on the feed roller, the overload protection device operates to prevent overload acting on the output shaft of the feed roller rotation drive motor. Become.

FIG. 1 is an overall front view of a cutting machine equipped with a material supply device of the present invention. FIG. 2 is an enlarged front view showing a motor portion with a speed reducer of the material supply device of FIG. 1. FIG. FIG. 3 is a cross-sectional view taken along line AA of FIG. FIG. 4 is a control block diagram of the material supply device of the present invention.

Hereinafter, embodiments of the present invention will be described based on the drawings. FIG. 1 is an overall front view of a cutting machine equipped with the material supply device of the present invention, FIG. 2 is an enlarged front view of the motor with reduction gear of the material supply device of FIG. 1, and FIG. 3 is A- of FIG. It is a sectional view of A. As shown in FIG. 1, the cutting machine equipped with the material feeding device of the present invention includes a cutting machine 1, a material feeding device 2 for feeding a long material to the cutting machine 1, and a bar material (long material) to the material feeding device 2. and a bar stocker 3 for supplying the material) 31. The bar stocker 3 stores a plurality of bars 31 and supplies the bars 31 therein to the material supply device 2 one by one. The material supply device 2 feeds the bar 31 to the cutting machine 1 by rotating a plurality of feed rollers 4, and the cutting machine 1 cuts the bar 31 to a predetermined size. A feeder sensor 26 arranged and attached to the material supply device 2 detects the presence or absence of the bar 31 on the material supply device 2 and controls the operation of the material supply device 2 . The cutting machine 1 is, for example, a lever press, in which the ram is moved up and down by a lever that rocks with one rotation of a driven large gear, and the movable blade is pushed down with respect to the fixed blade to cut the bar 31 to a predetermined value. It is cut to size (axial length).

As shown in FIGS. 1 to 3, seven feed rollers 4 are rotatably journalled on the base 21 of the material feeder 2, and in this example the drive shafts 5 of all the individual feed rollers 4 are connected to a speed reducer. The output shaft 62 of the speed reducer 61 of the motor-equipped motor 6 is directly connected. The output shaft 62 is hollow, and after inserting the right end of the drive shaft 5 into the hollow hole 64 of the output shaft 62 , the right end of the drive shaft 5 is fixed to the output shaft 62 with a key 63 . A lower end of a triangular anti-rotation plate 23 is fixed with a fixing bolt 22 to the mount 21 at a position corresponding to each motor 6 with a speed reducer. Two

anti-rotation pins

24 , 24 are fastened and fixed to the upper end of the anti-rotation plate 23 . That is, the

anti-rotation pins

24 , 24 are arranged at the same radial position from the center line of the fixing bolt 22 . The

anti-rotation pins

24 , 24 are inserted into two through-holes (perforating in the left-right direction in FIG. 3 ) 65 , 65 formed in the speed reducer 61 , respectively, to fix the speed reducer 61 to the mount 21 . It stops rotating. Since the fixing of the speed reducer 61 to the mount 21 is only a detent, the work of centering the motor 6 with the speed reducer with respect to the drive shaft 5 becomes unnecessary, and the work of mounting and replacing the motor 6 with the speed reducer becomes easy. Further, since the centering and fixing operations can be easily performed, even the existing material supply device 2 such as a chain drive can be easily improved by retrofitting.

As shown in FIG. 3, both ends of the drive shaft 5 are rotatably supported by

bearing blocks

25, 25 on the upper surfaces of the

pedestals

21, 21. A hollow cylindrical sleeve 51 is fixed to the central portion of the drive shaft 5 with a key 52 . Between both side surfaces of the feed roller 4 and the sleeve 51, two disk-

shaped friction plates

41, 41 are arranged so as to be relatively rotatable. The friction plate 41 on the right side (top in the drawing) is sandwiched between the flange 53 of the sleeve 51 and the right side surface (top in the drawing) of the feed roller 4 . The friction plate 41 on the left side (top in the drawing) is sandwiched between the pressing plate 54 and the left side surface (top in the drawing) of the feed roller 4 . The pressure plate 54 is pressed against the left friction plate 41 by a plurality of compression springs 55 arranged at equiangular positions on the side surface of the feed roller 4 . The pressing force of the pressing plate 54 is appropriately adjusted by

double nuts

56, 56 screwed onto the outer circumference of the sleeve 51. As shown in FIG. An Oiles bushing 43 is inserted between the cylindrical hollow hole 42 of the feed roller 4 and the outer peripheral surface 57 of the sleeve 51 to axially rotate the feed roller 4 relative to the outer peripheral surface 57 of the sleeve 51 . supporting. Therefore, under a normal load, the rotation of the output shaft 62 of the motor 6 with reduction gear is transmitted to the feed roller 4 via the drive shaft 5, the sleeve 51 and the

friction plates

41, 41, and the bar 31 is cut by the cutting machine 1. sent to. However, when an overload acts on the feed roller 4, the sleeve 51 rotates, but the side surface of the feed roller 4 rotates relative to the

friction plates

41, 41 and acts on the output shaft 62 of the motor 6 with a speed reducer. It becomes possible to prevent overload.

FIG. 4 is a control block diagram of the material supply device 2 of the present invention. In accordance with the rotation angle signal of the large gear that drives the ram of the cutting machine 1, the control device 71 of the material supply device 2 starts, stops, and controls the rotation speed of the motors 6 with reduction gears, which are seven induction motors. are controlled using one inverter controller 72 . The controller 71 receives a bar detection signal from the feeder sensor 26 and a bar supply signal from a sensor (not shown) of the bar stocker 3 . The material supply device 2 of the embodiment of the present invention has a cutting speed of 30 to 60 pieces/min depending on the tonnage of the cutting machine 1 (the ability of the cutting machine to pressurize), so it is extremely short (1 to 2 seconds). ), the motor 6 with a speed reducer repeats starting and stopping. Since the speed reducer 61 of the motor 6 with a speed reducer rotates by inertia even if the motor is instructed to stop, the bar 31 is pressed against the feed roller 4 by the impact of cutting by the cutting machine 1, and the feed roller 4 is suddenly pressed every time. An external force acts like braking. In the material supply device 2 of this embodiment, when the feed roller 4 is overloaded, the feed roller 4 rotates relative to the

friction plates

41 , 41 . Therefore, regardless of whether the motor 6 with a speed reducer is rotating, stopped, or rotating due to inertia, the frictional force of the friction plates 41 cuts off the power from the speed reducer 61 to the feed roller 4, overload can be prevented.

[Other embodiments]
Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments. In the above-described embodiment, the feed roller is rotatably supported on the drive shaft via the sleeve, but the feed roller may be directly rotatably supported on the drive shaft. Further, although the motor 6 with a speed reducer is an induction motor, it may be a synchronous motor without a speed reducer and using a permanent magnet as long as the rotation can be controlled. Further, the output of the deceleration motor 6 of the above embodiment is transmitted to the feed roller 4 via the

friction plates

41,41. That is, the torque transmitted by the friction between the

friction plates

41, 41 and the side surface of the feed roller 4 is controlled. However, this torque control is not limited to this friction mechanism. It is called a torque limiter, which is a structure in which a recess formed on the outer circumference of the transmission shaft and a steel ball fitted in this recess are pressed by a spring. It may be (see, for example, Japanese Patent Application Laid-Open No. 55-107124). Furthermore, in the above embodiment, the motors 6 with reduction gears are arranged on all the drive shafts 5 of the feed rollers 4, but depending on the length of the bar 31, etc., they do not necessarily need to be arranged on all of them.

REFERENCE SIGNS LIST 1 cutting machine 2 material supply device 21 frame 22 fixing bolt 23 anti-rotation plate 24 anti-rotation pin 25 bearing block 26 feeder sensor 3 bar stocker 31 bar (long material)
4 Feed roller 41 Friction plate 42 Hollow hole 43 Oiles bush 5 Drive shaft 51 Sleeve 52 Key 53 Flange 54 Pressing plate 55 Compression spring 56 Double nut 57 Outer peripheral surface 6 With reduction gear Motor 61...Reducer 62...Output shaft 63...Key 64...Hollow hole 65...Through hole 71...Control device 72...Inverter control device

Claims

a pedestal;
In a material supply device for a cutting machine, wherein a plurality of feed rollers are rotatably supported on the frame and arranged for feeding the long material in the axial direction to the cutting machine for cutting the long material,
a feed roller rotary drive motor having an output shaft directly connected to the drive shaft of the feed roller;
and an overload protection device interposed between the drive shaft of the feed roller and the output shaft to limit the output torque of the feed roller rotation drive motor.
In the material supply device for a cutting machine according to claim 1,
The feed roller rotation drive motor is a motor with a speed reducer whose start, stop, and rotational speed are controlled by an inverter control device, and which includes a speed reducer for reducing rotation of the feed roller rotation drive motor. Material feeder for cutting machine.
In the material supply device for a cutting machine according to claim 2,
The overload protection device includes a friction plate disposed between the side surface of the feed roller and the drive shaft of the feed roller so as to be relatively rotatable and pressed against the side surface by a spring. machine material feeder.
In the material supply device for a cutting machine according to claim 2 or 3,
a detent plate fixed to the frame corresponding to the motor with a speed reducer;
A material supply device for a cutting machine, comprising: a detent pin fixed to the detent plate and engaged with a through hole of the speed reducer of the motor with a speed reducer to prevent rotation of the speed reducer.