JPH0465530A - Metal detection system for opening and scutching process - Google Patents

Abstract

PURPOSE:To identify raw cotton bales relatively much contaminated with metallic pieces through such a system as to give an alarm when the frequency of switching from blow duct to bypass duct side in response to the metal detection by a metal detector installed on the way of the blow duct for cotton comes in excess of a specified level. CONSTITUTION:A metal detector 10 and bypass duct 20 are provided on the way of a blow duct 9 for the cotton detached from a row of bales, and when the presence of metal is detected, a switching is made from blow duct side to bypass duct side. And when the actuation frequency per unit time for the switching comes in excess of a specified level, a monitoring alarm 16 sends a relevant information to a centralized control room 30, resulting in a giving an alarm and, where needed, leading to the shutdown of the machine.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a metal detection system for a mixed batting process.

[Prior art] Generally, in a spinning factory, from receiving raw cotton to mixing and batting cotton,
Yarn is produced through various processes such as carding, kneading, roving, spinning, spinning, inspection and packaging, and warehouse shipping.
For example, the process of weaving, dyeing, etc. 6 In particular, from the time raw cotton is input to the carding machine to obtain the sliver, that is, generally from the mixing machine to the carding machine, "air flow cotton" is used. This makes the process more continuous. Furthermore, in some cases, the carding machine and the drawing machine are connected through a ventilation duct or pipe.

Air flow cotton is a method of air transporting cotton in its loose form.
In the bale opener blender arranged at the beginning of the cotton blending process, the bale opener blender main body moves on the bale row (traverse motion) and air-flows the plucked cotton.

However, these bales often contain metals of various sizes that cannot be predicted, and when these metals are mixed with loose cotton and transported by air, the high speed rotation of the cotton mixing machine contact with a striker, blade or pin, etc.
Sparks caused by the contact friction heat may cause a fire, or unfortunately when the cotton advances to the next process, the carding machine, it may get caught in the take-in roller, cylinder needle, etc., causing #4m to be worn out or causing a fire. or Therefore, a metal detection system has been known that detects and removes metals mixed in the cotton that is air-transported from a bale opener blender.

The conventional metal detection system can be replaced with the second metal detection system according to the embodiment of the present invention.
This will be explained using figures.

As shown in FIG. 2, a metal detector 10 is disposed in the middle of the air blowing duct (cotton feeding duct) 9, and a detour duct 20 communicating with a metal recovery chamber 22 is provided in the middle of the air blowing duct 9 on the downstream side. When metal is detected by the metal detector 10, the passage switching piece 25 provided at the entrance of the detour duct 20 is switched from the ventilation duct 9 side to the detour duct 20 side for a predetermined period of time. As a result, the part of the pneumatically blown cotton during the time period in which metal may be mixed is collected into the metal collection chamber 22. According to this configuration, if metal is present in the cotton plucked with the bale opener blender, the mixed metal is reliably removed.

1. Problems to be Solved by the Invention] However, conventional metal detection systems only remove mixed metals when detected, and are therefore unsuitable for constructing the above-mentioned automated or unmanned systems. That is, the abnormality cannot be reported to the central control room, resulting in insufficient management.

In addition, there are cases in which metal pieces are mixed into the raw cotton in an abnormally concentrated manner, and each time metal is detected, the fed cotton is removed together with the metal pieces. Therefore, the amount of raw cotton to be removed or discarded increases, and the amount of effort required to sort out or discard metal increases.

An object of the present invention is to provide a metal detection system suitable for constructing an automated or unmanned system.

Means for Solving Two Problems 1 The metal detection system for the mixed batting cotton process according to the present invention is such that a metal detector and a detour duct are sequentially installed in the middle of the air duct for the cotton plucked from the bale row, and metals are detected. In the metal detection system, which switches the ventilation duct to the detour duct and removes the mixed metal, when the number of operations per unit time for removing the mixed metal exceeds a predetermined number of times, a notification to that effect is sent to the central control room. It is equipped with an alarm device that generates an alarm.

[Function] The bale opener blender, for example, arranges a very large number of bales of different line types in a straight line in the horizontal direction, and slowly moves the bale opener blender body in the horizontal direction over this row of bales. The upper layer of each bale is peeled off using the opening cylinder, and then the position of the opening cylinder is lowered a little and the same operation is repeated, successively peeling off the layer slightly lower than the previous one.

When metal pieces are mixed into the raw cotton bale in an abnormally concentrated manner in the vertical direction, the number of operations per unit time for removing mixed metal in the metal detection system exceeds a predetermined number of times.

This is monitored by an alarm device, and the central control room is notified of this, and an alarm is issued or the machine is stopped as necessary. Therefore, even in the centralized control room, the abnormal state of metal detection can be grasped, and it is possible to avoid excessive repetition of the operation of removing the portion of the cotton feed that is thought to contain mixed metal.

Second Example] Hereinafter, the present invention will be described with reference to illustrated embodiments.

FIG. 1 shows an overview of the storage section 1 of a spinning factory and the first bale opener blender 2 in the 5-mix batting process.

In the figure, reference numeral 3 denotes a bale row in which multiple types of bales are arranged in a line in a number and ratio that provides a predetermined blending ratio.Next to this bale row 3 is a bale row 4 in which bales are similarly arranged.
In this example, each of the 62 bale rows 3.4 arranged in parallel consists of 50 bales 5 arranged horizontally in a straight line.

Reference numeral 6 denotes a bale opener blender body equipped with an opening cylinder 7, which extends along a rail 8 disposed between the bale rows 3 and 4 and extends linearly in the horizontal direction, that is, bale rows 3, 4.
Move parallel to 4. As the bale opener blender main body 6 moves, the opening cylinder 7 supported by the main body 6 in a cantilever manner slowly moves horizontally over the bale row 3 and strips off the upper layer of the bale row 3. After one plucking of the bale row 3 is completed, the opening cylinder 7 is lowered slightly, and the opening cylinder 7 is either turned back over the bale row 3 or turned over the next bale row 4. It changed its direction and came back on top of Bale Row 4.

The cotton plucked by the opening cylinder 7 is pneumatically transported in the direction of the rail, and air-flow-fed to the next process by the air duct 9.

In FIG. 2, as already mentioned, the blower duct 9 is provided with the detection head 11 of the metal detector 10, and the detour duct 20 is provided downstream thereof. The detour duct 20 has an entrance path 21. Metal recovery room 22. It consists of an exit path 23, and a collection H2 with casters is located below the metal collection chamber 22.
4 is placed. Switching to the detour duct 20 is performed by switching passage switching pieces 25, 26 provided at the inlet and outlet of the bypass duct 20 from the blower duct 9 side using the electromagnetic valve 15 (FIG. 4). However, the outlet passage 23 and the passage switching piece 26 can be omitted, and the air that has been fed can be discharged into the room from the rough mesh cloth bag. In such a configuration, the passage switching piece 25 can be omitted. It is enough to switch.

Specifically, the metal detector 10 includes a detection head 11 and a delay circuit section 12, as shown in FIG. The detection head 11 includes primary and secondary high frequency coils L1 . L2, a high-frequency power source E that excites the secondary coil L1, a rectifier that converts the output of the differential coil pair constituting the secondary coil L2 into direct current, and a normal wire that does not contain any metal mixed in during cotton feeding. It consists of an amplifier A that balances this DC output to zero in the state of .

The switching signal generation unit 12 includes a timing delay circuit 13 that generates a switching signal that takes the minimum switching time by taking into account the distance difference on the air duct 9, and a drive amplifier 14 that operates the electromagnetic valve 15. Consists of.

When metal is detected by the detection head 11, the timing delay circuit 13 of the switching signal generation unit 12 starts counting time from the time of detection, and predicts that the metal will be transported to just before the detour tact 20. The switching signal S is generated at the specified time. Therefore, the timing at which the switching signal S is generated is delayed by the transport distance from the metal detection time point. This is to avoid wasting cotton as much as possible in order to remove metals. Further, the time width of the generated switching signal S is set to a predetermined time period that is long enough to take out the mixed metal out of the air duct 9.

When metal is present in the air duct 9, the detection head 1
1's magnetic balance is disrupted, and a detection signal is generated at amplifier A. The switching signal generation unit 12 starts timing from the time of detection, waits until the time when the metal is transported just before the detour duct 20, and generates the switching signal S at the time. The electromagnetic valve 15 operates, and the flow path switching piece 25.2
6 is switched from the ventilation duct 9 side to the detour duct 20 side, whereby the metal is recovered into the metal recovery chamber 23. A part of the air is returned to the ventilation duct 9 through the perforated plate 27, but the flow path switching piece 26 on the outlet side can be kept closed. The metal accumulated in the collection chamber 22 is dropped into the collection box 24 below by opening the opening/closing lid 28, and is appropriately removed.

The metal is detected and removed as described above, but at the same time, the switching signal S is input to the monitoring and alarm device 16,
The monitoring and alarm device 16 manages whether or not the number of metal detections per positioning time exceeds a control limit value. The second control limit value is, for example, 5 times per hour when the switching signal occurs.
If this occurs more than once, it is defined as the control limit. In the example in Figure 3, once between 3.00 AM and 4.00 AM, and once at 6:00 AM.
7:00 AM, the monitoring and alarm system 16 determines that the control limit has been exceeded and sends a message to the host computer 31 of the central control room 30 saying "Metal detection abnormality" at 7:00 AM. ” to report. When this notification is received, or when an operator in the control room performs a confirmation operation, the host computer 31 displays the line type mark of the raw cotton and the identification of the handling trading company on the monitor. In addition, in response to the above notification or further receiving the exact ratio signal from the operator in the control room, the host computer 31 causes the on-site cotton mixing machine to issue an abnormal alarm such as a flashing lamp, or operates the bale opener blender. automatically stop. The operator of the mixed batting machine investigates the cause of the blinking light on the mixed batting machine from the standpoint of metal contamination, and if he finds a bale with severe metal contamination, he replaces the bale.

In this way, the monitoring and alarm device 16 grasps when the number of occurrences of the switching signal S per unit time reaches the control limit,
Based on the high number of metal detections, the current work in progress predicts that there is an abnormal bale inside the raw cotton bale, and is actively trying to find and remove the bale to prevent abnormal production from continuing. It is something to do.

However, the number of raw cotton bales actually set is
As already mentioned, there are cases where there are a large number of pieces, such as up to 100 pieces, and in such cases it is difficult to determine from which veil the metal was last discovered.

Therefore, the current position signal of the bale opener blender main body 6 is input to the monitoring and alarm device 16. This is extracted from the digital signals communicated between the body 6 and the host computer 31 for computer operation of the bale opener blender. Metal detector 10 from the current position of the bale opener blender body 6
Since the distance to the bale is known in advance, when metal is found and the switching signal S is generated, the position of the bale containing the metal or the bale opener blender body 6
It is estimated by backward calculation from the position of .

If metal is found and the switching signal S is generated, it is assumed that metal was present in the range of 2 bales before and after the above estimated position of the bale opener-brenter main body 6, for a total of 5 bales), and the area is After passing through this area, the 6-bell opener blender body 6, which remembers this, returns to this same area many times and plucks the cotton.

When metal is detected within this area, for example three times within the control limit, the computer 31 in the central control room 30 is notified that the control limit has been exceeded, and an abnormality alarm is issued in the same way as above. Put it out against the cotton machine or put it in a bale oven.
Automatically stops the blender. In this case, the operator may detect metal again and again in any of the bales in the area from before and after the specified bale number or the position of the stopped bale organizer blender main body 6. Therefore, it would be sufficient to test if there is a problem. This facilitates locating the bale.

[Effects of the Invention] As described above, according to the present invention, if golden shards are mixed into the raw cotton bale in an abnormal concentration, this is monitored by the alarm device, and an alarm is generated or triggered. The table can be stopped. Therefore, even if you are in the central control room, the status of metal detection abnormalities can be ascertained, and the parts of the cotton feed that are thought to contain mixed metals can be detected.
Avoid excessively repetitive movements.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of the mixed cotton batting process according to the embodiment of the present invention, Fig. 2 is a schematic diagram of the metal detection system, Fig. 3 is a diagram illustrating the control limit of the number of operations, and Fig. 4 is a diagram illustrating the control limit of the number of operations. FIG. 2 is a block diagram showing the configuration of a metal detector. In the figure, 1 is the storage section, 2 is the bale opener renderer,
3 and 4 are bale rows, 5 is a cotton bale, 6 is a bale opener-blender main body, 7 is an opening cylinder, 8 is a rail, 9 is a blower duct, 10 is a metal detector, 11 is a pressure detection head, 12 is a switching signal 13 is a timing delay circuit, 14 is a drive amplifier, 15 is @magnetic pulp, 16 is a monitoring alarm device, 20 is a detour tact, 22 is a metal recovery room, 25
26 is a flow path switching piece, 30 is a central control room, and 31 is a host computer.

Claims (1)

[Claims] 1. Metal detection: A metal detector and a bypass duct are sequentially installed in the middle of the cotton ventilation duct that has been plucked from above the bale row, and when metal is detected, the ventilation duct is switched to the bypass duct to remove the mixed metal. The system is equipped with an alarm device that notifies a central control room and generates an alarm when the number of operations per unit time for removing mixed metals exceeds a predetermined number of times. Metal detection system.