JPS5826750A - Hoop feeder - Google Patents

Abstract

PURPOSE:To instantaneously detect breakage of a hoop and automatically stop feed rolls, by a method wherein the breakage of the hoop is detected by detecting an abnormality in the rotating speed of a tension pinch roll rotated by a driving source with a rotating speed changeable according to the load thereon, in a feeder particularly for a three-dimensional net form metallic hoop. CONSTITUTION:The tension pinch roll 3 for imparting a tension to the hoop 1 is provided on the downstream of a pinch roll 2 for fixed-speed feeding of the hoop 1. The roller 3 is rotated by the driving source 12 including a powder clutch 11 so that the rotating speed of the roller 3 is changed according to the load thereon. The abnormality in the rotating speed of the roll 3 arising from the breakage of the hoop 1 is detected by a measuring signal generated by a pulse generator (18, 20) provided for the roll 3, and the roll 2 is stopped. Simultaneously, a solenoid clutch 21 for a hoop discharger is energized, the powder clutch 11 is deenergized, a tension pinch roll 7 is rotated by a motor 30, and the hoop 1' fed after the breakage of the hoop is automatically discharged.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hoop feeding device, such as a three-dimensional mesh metal hoop, which has very low mechanical strength. is an enlarged view of a three-dimensional metal mesh that is a typical example of a porous hoop. This three-dimensional metal mesh is processed into a hoop shape as shown in Figure 2 in order to be continuously conveyed through the equipment. ing. This type of hoop has extremely weak mechanical strength, so when applying tension to the hoop 1, the number of rotations is changed according to the load and the hoop is driven.
For example, a drive source equipped with a powder clutch is used.

The configuration in this case is as shown in FIG. 3, and the pinch roll 2 for constant speed feeding of the hoop 1 is rotated at a constant speed by a motor 6 with a reduction gear via a sprocket 3.4 and a chain 5. Further, the tension pinch roll 7, which is provided downstream of the hoop 1 from the constant speed feeding pinch roll 2 and which applies tension to the hoop 1, has sprockets 8, 9 and a chain 1o1.
The tension pinch roll 7 is rotationally driven by a drive source consisting of a powder clutch 11, and in this case, the tension pinch roll 7 rotates at a synchronous speed with the constant speed feeding pinch roll 2.

Sorry, the powder clutch 11 is a 12Vc motor with a reducer.
From sprockets 13, 14. Driven via chain 15. In this case, unless the rotational speed of the input shaft of the powder clutch 110 exceeds 1 orpm, the original torque characteristics of the powder clutch 110 cannot be obtained, so the input shaft is designed to have a rotational speed of 10 rpm or more.

Further, the rotation speed of the constant-speed feeding pinch roll 2 is 3 rpm or less, and the speed difference is absorbed by the slip within the powder clutch 11. Therefore, when the hoop 1 breaks, the slip inside the powder clutch 11 disappears, and the hoop 1' after the broken part runs out of control.

Conventionally, breakage of the hoop 1 has been detected by attaching a light emitter/receiver 17 immediately after the device 16 when a detection device cannot be installed in the device 16 that performs chemical processing, etc., but in this case, the breakage point a Detection is not possible until the distance has increased.
During this time, the rotation of the input shaft of the powder clutch 11 is transmitted to the tension pinch roll without slipping, which causes the hoop 1' to run out of control after the broken part, resulting in a reduction in processing time and a defective product. If the breaking point a is not precisely guided within the device 16, there is a problem in that the hoop 1 is bent internally as the hoop 1 is transported by the constant-speed feeding pinch rolls 2.

Purpose of the Invention The present invention solves the above-mentioned problems. In particular, when a hoop breaks during transportation, it instantly detects the breakage, automatically stops feeding the hoop, and removes the hoop remaining in the device. An object of the present invention is to provide a hoop feeding device capable of drawing out at a constant speed.

Structure of the Invention The present invention provides a tension roll downstream of a pinch roll for constant-speed feeding of the hoop, and is configured to drive the tension roll so that the number of rotations changes depending on the load in order to apply tension to the hoop, thereby preventing breakage of the hoop, etc. A pulse generator detects an abnormal rotation speed of the tension roll due to the above-described constant-speed feeding, and stops the pinch roll for constant-speed feeding, and also drives a separately provided hoop discharge device to prevent accidents caused by hoop breakage. It is.

DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of the present invention will be described based on the accompanying drawings.

In FIGS. 4 and 5, parts that are the same as those of the conventional example are given the same numbers and their explanations are omitted. 18 is a rotating disk attached to the tension pinch roll 7, and this rotating disk 18 has a large number of holes 19 formed at equal pitches as shown in FIG. 180 This is a horse-shaped detector installed across the hole 19, and this detector 2o has the hole 19.
A light emitter/receiver 42 is attached to a portion corresponding to the
Due to the constant rotation of the rotating disk 18, the output of the light emitter/receiver 42 becomes a pulse wave having regular intervals as shown in FIG. 6 during steady state, but when it breaks, it becomes a pulse wave after the break point a as shown in FIG. An error occurs in the interval.

Next, referring to FIG. 8, a system diagram of a device for automatically discharging the hoop 1' after the breakage from the device 16 when the hoop 1 breaks will be described. When the hoop 1 breaks, the excitation of the powder clutch 11 is released simultaneously with the detection of the hoop breakage, so the sprocket 9 begins to rotate freely. At the same time, the electromagnetic clutch 21 is energized, and the tension pinch roll 7 is connected to the sprocket 8, the chain 10, the sprocket 22, the shaft 23, the second row sprocket 24, the chain 26, the sprocket 26. It is rotated at a constant speed by a motor 30 with a reduction gear via an electromagnetic clutch 21, a sprocket 27 degree chain 28, and a sprocket 29.

Here, the rotational speed of the tension pinch roll 7 is almost synchronized with the rotational speed of the constant-speed feeding pinch roll 2, so the hoop 1' after the broken part is fed at almost the same speed as if it were fed without breaking. 16, so processing defects will not occur. Also, 31a and 31b are shafts 23
It is a bearing unit that holds the In a steady state, the electromagnetic clutch 21 is de-energized, so the sprocket 26 is free and rotated by the torque of the powder clutch 11.

FIG. 9 is a block diagram showing the control system, and the pulse wave 3
2 is generated in the light emitter/receiver 42 due to the rotation of the rotating disk 18. Then, at the instant of 33 when the light emitter/receiver 42 is cut off, the timer 36 starts counting, and the timer 36 starts counting.
At the instant N, 34, the timer 36 finishes its count and returns to its original position to wait.

Here, if the count of the timer 36 does not exceed the timer setting 350 count value, an abnormality signal 37 is issued, a hoop breakage alarm and display 38 are performed, and the motor 6 is stopped by the motor stop circuit 39. Furthermore, the powder clutch 11 is opened by the powder release circuit 40, and the electromagnetic clutch 21 is further excited by the electromagnetic clutch excitation circuit 41, so that the tension pinch roll 7 is moved at a speed almost synchronized with the constant speed feeding pinch roll 2. Rotate at a constant speed. As a result, if the hoop 1 breaks in the device 16, the moment is detected and the fixed-speed feeding vinyl roll 2
Since the rotation of hoop 1 is stopped, the supply of hoop 1 is stopped,
The hoop 1' remaining in the device 16 is then pulled out at a constant speed by the tension pinch rolls 7.

Effects of the Invention As described above, according to the present invention, it is possible to instantaneously detect hoop rupture due to an abnormal rotation speed of the tension pinch roll, which is rotationally driven by a drive source whose rotation speed changes depending on the load. By stopping the vinyl roll for feeding the hoop at a constant speed, it is possible to prevent the hoop from bending inside the device, and furthermore, the hoop after the breakage point is automatically ejected at a constant speed by the hoop ejection device. Therefore, it is possible to prevent the hoop from running out of control after the broken part in the device as in the past, and also to prevent products using expensive three-dimensional mesh metal etc. from becoming defective by shortening the processing time. I can do it. Further, if the tension pinch roll is rotationally driven by a powder clutch, the tensicon force of the hoop is stabilized due to the characteristics of the powder clutch, and its control becomes easy.

In the above embodiment, only hoop breakage was detected, but even if the rotation of the tension pinch roll stops due to foreign matter getting caught in it, the interval distribution 1 of the pulse wave of the pulse generator (limited to By detecting this instantaneously using the same method as in the above embodiment, it is possible to prevent the occurrence of defective products.

[Brief explanation of drawings]

Fig. 1 is an enlarged view of a three-dimensional mesh metal hoop, Fig. 2 is a perspective view of a three-dimensional mesh metal hoop, Fig. 3 is a front view of a hoop feeding device showing an embodiment of the present invention, and Fig. 4 is a top view of the hoop. Figure 5 is a perspective view of the pulse generator, Figure 6 is a waveform diagram of steady pulses,
FIG. 7 is a pulse waveform diagram when the hoop breaks, FIG. 8 is a drive system diagram of the tension pinch roll, and FIG. 9 is a control system block diagram. 1... Hoop, 2... Binch roll for constant speed feeding, 3... Tension pinch roll, 1
1. Old... Powder clutch, 18, 19.42...
...Pulse generator. 21... Electromagnetic clutch. Name of agent: Patent attorney Toshio Nakao (1st person)
Figure 3 Figure 5 Figure 6 Figure 7 Figure 8

Claims (2)

[Claims] (1) A pinch roll for constant-speed feeding of the hoop, a tension pinch roll that is provided downstream of this pinch roll and applies tension to the hoop, and the rotation speed changes depending on the load on this tension pinch roll. a tension pinch roll drive source for driving the tension pinch roll, a pulse generator provided on the tension pinch roll, a hoop discharge device that operates when the constant speed feeding pinch roll is stopped, and the pulse generator. A hoop feeding device comprising: a device for detecting an abnormal rotational speed of a tension pinch roll based on a measurement signal, and stopping the constant speed feeding pinch roll; and a device for driving the hoop discharging device. (2) The hoop feeding device according to claim 1, wherein the drive source for the tension pinch roll includes a powder clutch.