Coiled material shortage alarm method and device

Abstract

The invention discloses a coiled material shortage alarm method and device, and belongs to the technical field of production and manufacturing, and the alarm method comprises the steps: obtaining the real-time use number of turns of a coiled material; carrying out material shortage early warning according to the real-time use circle number and a preset early warning circle number; the setting method for the number of pre-warning turns comprises the steps that the number of reserved turns of a coiled material is determined based on the advanced material preparation requirement and the process requirement; the number of pre-warning turns is set according to the number of reserved turns of the coiled materials, pre-warning can be conducted before the materials are used up, an operator can make a response in time and prepare for the materials to arrive at a material shortage station, and therefore the downtime caused by material shortage of equipment is shortened, and the production efficiency and the productivity of the equipment are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of production and manufacturing, and in particular relates to a coil material shortage alarm method and device. Background Art

[0002] With the continuous development of society and the continuous advancement of science and technology, mechanized automated production has become a development trend, gradually replacing traditional manual labor and injecting new power into the sustainable development of enterprises. Therefore, manufacturing enterprises must keep pace with the times, actively promote technological transformation through transformation and upgrading, and vigorously develop mechanized automated production to improve the level of "intelligent manufacturing" and achieve sustainable development.

[0003] In the production workshops of manufacturing factories, there are a large number of coil-using stations in various production and assembly processes, which present the following problems: 1. When the materials are used up, the equipment automatically shuts down, and the operators take a long time to prepare the materials and reach the station where the materials are out of stock; 2. Operators are often in a one-person-multiple-machine mode. When a material shortage alarm occurs on one of the devices, the operator cannot immediately detect which device is short of material, and the response time is long.

[0004] In the prior art, various sensing devices are often used to detect the consumption of coiled material. For example, Chinese patent application number 201320431409X protects a coiled material shortage detection device. A laser transmitter and a laser receiver are respectively arranged on the radial sides of the paper mold cylinder and the coiled material. The laser emitted by the laser transmitter is aligned with the sensing hole of the laser receiver, and the straight line of the laser light path is tangent to the outer wall of the paper mold cylinder, thereby realizing timely detection of coiled material exhaustion.

[0005] However, even if the exhaustion of the coil is detected in time, the material preparation personnel still need to prepare and replace the materials after being informed of the exhaustion. There is still idle waiting time at the workstation, and there is room for further optimization of production and assembly efficiency. Summary of the Invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a coil material shortage alarm method and device. The preparation time is obtained according to the process requirements, and the number of warning circles is set for the coil material based on the time required for advance preparation, so that the material can be replaced as soon as the coil material is exhausted, eliminating the idle time of material preparation waiting at the work station and improving the efficiency of production and assembly.

[0007] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0008] In one aspect, the present invention provides a coil material shortage alarm method, comprising: Get the real-time usage number of coils; Provide material shortage warning based on real-time usage cycles and preset warning cycles; The method for setting the number of warning laps includes: Determine the number of coils reserved based on advance material preparation requirements and process requirements; Set the number of warning circles according to the number of reserved circles of the coil.

[0009] By capturing the number of coils used in real time and comparing it with a preset warning count, a material shortage warning can be issued before the coil is about to run out. This allows operators to be aware of coil usage in advance, allowing them to prepare in sufficient time and avoid equipment downtime due to sudden coil exhaustion. This effectively reduces equipment downtime caused by material shortages, thereby improving overall equipment efficiency and production capacity.

[0010] Optionally, obtaining the real-time number of coiled material turns includes: Proximity sensing is performed on a sensing block provided on a side wall of the mounting shaft by a first sensor; The real-time number of coil turns is obtained according to the number of approaches sensed by the first sensor.

[0011] The first sensor and the sensor block work together to accurately count and automatically monitor the number of coils used. This non-contact sensing method not only accurately counts, but also does not interfere with the normal operation of the coil, ensuring the stability of the production process and the reliability of the data, providing an accurate basis for subsequent material shortage warnings.

[0012] Optionally, obtaining the real-time number of coil turns according to the number of proximity detected by the first sensor includes: The proximity signal collected by the first sensor is sent to the material calling system, so that the number of used revolutions displayed in the material calling system is increased by one to obtain the real-time number of revolutions of the installation shaft; The real-time number of coiled material revolutions is obtained based on the real-time number of revolutions of the mounting shaft.

[0013] The sensor signal is sent to the material calling system, where the number of coils used is updated in real time, allowing operators to intuitively understand the progress of each coil's use. This enables centralized data management and visual display, facilitating unified monitoring of coil usage across multiple devices and improving the efficiency and convenience of production management.

[0014] Optionally, the material shortage warning is performed based on the real-time usage number of circles and the preset warning number of circles, including: when the used number of circles displayed in the material ordering system is superimposed on the warning number of circles value, the material ordering system issues a corresponding warning alarm.

[0015] This timely reminder mechanism helps shorten the operator's response time, ensures that material preparation and replacement can be completed before the coil runs out, minimizes equipment downtime and waiting time, and improves production efficiency.

[0016] Optionally, determining the number of coils to be reserved based on advance material preparation requirements and process requirements includes: Determine the standard length and duration of a single use of coil material according to process requirements; Determine the number of coils reserved based on advance material preparation requirements and the standard length and duration of single material usage.

[0017] Based on the needs of different processes and the time required for advance material preparation, the number of reserved coils is calculated and the number of warning coils is set accordingly, making the warning more consistent with actual production conditions. It can be customized according to the usage characteristics of different equipment and different coils, ensuring accurate material shortage warnings while meeting production process requirements, avoiding early or late warning signals, and improving the effectiveness and practicality of warnings.

[0018] Optionally, determining the number of coils reserved based on advance material preparation requirements and the standard length and duration of a single material usage includes: Determine the number of times the coil is reserved for use based on the time required for advance material preparation and the standard time for a single use of the material; Determine the reserved length of the coil according to the number of times the coil is reserved for use and the standard length of a single use; The number of coils to be reserved is determined based on the coil length to be reserved.

[0019] The required number of coils is calculated by comprehensively considering factors such as the standard duration and length of a single material usage in the process requirements, as well as the time required for advance material preparation. This calculation method based on data and time parameters can ensure that the reserved number of coils can not only meet the normal progress of the production process, but also provide sufficient time for material preparation and replacement, thereby achieving reasonable planning and effective use of resources in the production process and ensuring production continuity.

[0020] Optionally, setting the number of warning turns according to the number of reserved turns of the coil includes: Determine the number of coils that can be used based on coil specifications; The number of warning circles is determined based on the number of available circles and the number of reserved circles for the coil.

[0021] Taking into account that coils of different specifications have different rated parameters, the corresponding number of usable turns is obtained according to the coil specifications, and the number of warning turns is set in combination with the reserved number of turns, so that the warning method can be applied to coils of various specifications.

[0022] Optionally, the alarm method further includes: The coil core is sensed by the second sensor. When the coil core is sensed to be missing, a missing signal is sent to the material calling system, so that the number of used coils displayed in the material calling system is reset to zero.

[0023] The second sensor promptly sends the missing signal of the coil core to the material calling system, automatically clearing the number of used coils to zero. This ensures that the counting in the material calling system is accurate, avoids early warning errors caused by manual intervention or counting errors, improves the automation and reliability of the system, and also provides an accurate starting point for counting the number of coils used in the next round.

[0024] Optionally, the alarm method further includes: The coil discharge point is sensed by a third sensor. When it is sensed that the coil discharge point is vacant, a vacancy signal is sent to the material calling system, causing the material calling system to issue a corresponding shutdown alarm. The coil discharge point is located on the coil discharge section between the coil discharge port and the destination workstation.

[0025] A third sensor monitors the coil discharge area in real time. Once it detects a coil shortage, a shutdown alarm is triggered. This effectively prevents product quality issues or equipment damage caused by continued production due to coil exhaustion, protecting both the equipment and the production process. Furthermore, the timely shutdown alarm alerts operators to promptly address the coil exhaustion situation, resuming production as soon as possible and minimizing unnecessary production losses.

[0026] On the other hand, the present invention provides a coil material shortage alarm device, comprising: a sensing module, a material calling system and a host computer; The sensing module is connected to the host computer, and includes a first sensor, a second sensor, and a third sensor; The first sensor is arranged on one side of the coil installation shaft, and the connection line between the first sensor and the sensing block arranged on the side wall of the installation shaft is perpendicular to the axis diameter of the installation shaft, and is used to perform proximity sensing on the sensing block and send the proximity sensing signal to the host computer; The second sensor is provided at one end of the coil core and is used to sense the presence of the coil core and send a material change sensing signal to the host computer; The third sensor is arranged on one side of the coil discharging place, and is used to sense the presence of the coil discharging place and send a material shortage sensing signal to the host computer, wherein the coil discharging place is located on the coil discharging section between the coil discharging port and the destination station; The material calling system is connected to the host computer, and is used to adjust the display value of the number of used turns according to the proximity sensing signal and the material change sensing signal sent by the host computer, and to issue corresponding alarms according to the display value of the number of used turns and the material shortage sensing signal; The host computer is used to execute the coil material shortage alarm method as described in any one of the first aspects.

[0027] By organically integrating the sensing modules, the material-calling system, and the host computer, a complete coil shortage alarm system has been formed. Each sensor is responsible for collecting information on the coil's status and transmitting this data to the host computer for processing and analysis. The material-calling system, in turn, issues corresponding alarms and displays information based on the host computer's instructions. This integrated approach enables collaborative operation between various components, improving the overall system's operational efficiency and reliability. It provides timely and accurate monitoring and early warning of coil shortages, effectively meeting the need for coil usage monitoring during the manufacturing process and ensuring production efficiency.

[0028] Compared with the existing technology, the beneficial effects achieved by the present invention are: the reserved preparation time is equivalently converted into the reserved number of coils according to the process requirements of the use of coils on the production line, and the number of coils used for the same specification at the same workstation is standardized and controlled, which can achieve early warning before the material is exhausted, so that the operator can prepare the material in advance to arrive at the material-deficient workstation and change the material in time when the equipment is shut down due to lack of material, thereby reducing the downtime of the equipment due to waiting for lack of material, further reducing the response time of material change compared with the existing technology, and improving the equipment OEE and production capacity. The present invention can maximize the level of data utilization, with low investment, and can formulate corresponding warning thresholds for coils of different specifications and process requirements. It has a wide range of applications and is easy to standardize, which is convenient for large-scale promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 FIG2 is a flow chart of a coil material shortage alarm method in one embodiment of the present invention;

[0030] Figure 2 The figure shows a schematic diagram of the structure of a glue-applying station in one embodiment of the present invention;

[0031] Figure 3 The figure shows a data interaction diagram of a material ordering system in one embodiment of the present invention;

[0032] Figure 4 The figure shows a schematic diagram of the coordinated operation of the gluing station and the material calling system in one embodiment of the present invention.

[0033] In the figure, 1. first sensor; 2. second sensor; 3. third sensor; 4. shaft; 5. rubber ring; 6. tape; 60. sticky surface; 7. roller; 8. bracket; 9. clamping device; 10. cutting device; 11. adsorption and gluing mechanism; 12. clamping claw; 13. host computer; 14. material calling system; 15. repeater; 16. receiving end. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0036] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0037] Example 1

[0038] like Figure 1 As shown, this embodiment provides a coil material shortage alarm method, comprising: Get the real-time usage number of coils; Provide material shortage warning based on real-time usage cycles and preset warning cycles; The method for setting the number of warning laps includes: Determine the number of coils reserved based on advance material preparation requirements and process requirements; Set the number of warning circles according to the number of reserved circles of the coil.

[0039] A coil warning number is set based on the need for advance material preparation and the process requirements of the coil use station. When the number of coil use circles reaches the threshold warning number, an external warning is issued to remind the operator to prepare materials in advance, so as to facilitate timely response when the material shortage stops, reduce the downtime waiting time on the production line, and improve production and assembly efficiency.

[0040] Example 2

[0041] Based on Example 1, this example also makes the following design.

[0042] In this embodiment, the roll tape 6 on the gluing station in the production and assembly process of the battery cell is used as an example to specifically illustrate the method for alarming for lack of roll material.

[0043] like Figure 2 and Figure 4 As shown, Figure 2 The gluing station in the main view is Figure 4 The gluing station in the figure is a left view, and the structure of the gluing station is as follows: the tape 6 is installed on the shaft 4 through the rubber ring 5, and the lead-out part of the tape 6 is extended and pulled down by the roller 7, with the sticky surface 60 facing outward, passing through the right side section of the bracket 8, the clamping device 9 and the middle of the adsorption and gluing mechanism 11, and the tail end is vertically in the middle of the clamping claw 12. A sensing block perpendicular to the shaft diameter direction is installed on the outer side of the shaft 4. The first sensor 1 is groove-shaped and is installed corresponding to the position of the sensing block to sense the number of rotations of the shaft 4. A second sensor 2 is installed in the diameter direction of the rubber ring 5, and the second sensor 2 faces the end face of the rubber ring 5 to sense whether the tape 6 has been replaced. A third sensor 3 is installed on the bracket 8, which is set on the necessary section for the tape 6 to be discharged to determine whether the tape 6 is exhausted.

[0044] like Figure 3 As shown, the data interaction method of the material ordering system 14 is as follows: the first sensor 1, the second sensor 2, and the third sensor 3 are each connected to the host computer 13 via a network cable, and the collected sensing data is uploaded to the host computer 13. The host computer 13 and the material ordering system 14 exchange data through the API interface. The material ordering system 14 includes a material ordering dashboard and a material shortage warning setting panel. The material ordering system 14 is connected to the transponder 15 via a serial port. The transponder 15 sends material shortage warning and alarm information to the receiving end 16 watch.

[0045] In this embodiment, the material order board displays the following information: equipment name, equipment warning and alarm lights, warning and alarm information, schematic diagrams of materials corresponding to each equipment station, and material quantity. Clicking the material schematic on the material order board enters the material shortage warning setting panel, which displays the following information: the number of rubber coils that can be applied to the tape 6, the number of warning coils set, and the number of rubber coils applied. The number of coils in this embodiment is measured per rotation of the shaft 4. The number of rubber coils applied is added based on the number of rotations of the shaft 4 sensed by the first sensor 1, and the number of rubber coils applied is reset based on the signal of the removal of the rubber coil 5 sensed by the second sensor 2. The number of available rubber rings in the material shortage warning setting panel is directly derived from the specification of Tape 6 and is the rated value of Tape 6 of this specification; the calculation method for the number of warning setting circles in the material shortage warning setting panel is as follows: reserved number of glue application times = material preparation time and time of walking to the material shortage station / single glue application time; reserved total glue application length = reserved number of glue application times single glue application length; leave a rubber strip with a length equal to the total length of reserved glue application on the rubber ring, and verify at the glue application station that the rubber ring with the rubber strip with the total length of reserved glue application can make the shaft 4 rotate N times. If there is no remaining rubber strip on the rubber ring after the shaft 4 rotates N times, N is used as the reserved number of rubber ring circles. If there is remaining rubber strip on the rubber ring after the shaft 4 rotates N times, N+1 is used as the reserved number of rubber ring circles. The number of warning setting circles = number of available rubber rings - number of reserved rubber ring circles. The material call board can centrally display the material shortage situation of all workstations, and give early warning before the equipment stops due to material shortage. If the personnel respond to the warning in time, they can walk to the material shortage station to replace the material when the tape 6 is just used up.

[0046] like Figure 2 and Figure 4 As shown, the operation and data interaction process of the gluing station is as follows:

[0047] (1) Normal operation; the clamping claw 12 clamps the tape 6, and the clamping device 9 clamps the upper end of the tape 6 at the same time. At this time, the cutting device 10 cuts the tape 6, and the adsorption and gluing mechanism 11 adsorbs the upper and lower ends of the cut tape 6 and moves to the right, and sticks the tape 6 to the rubber ring 5; during the use of the tape 6, the shaft 4 will rotate, and the first sensor 1 senses the number of rotations of the shaft 4 and sends the sensing signal to the material calling system 14. Each time a rotation signal is received, the number of rubber rings pasted in the material shortage warning setting panel will be +1. When the number of warning settings is not reached, the number of rubber rings pasted box is green, and the corresponding tape mark number in the material calling board is gray, and no alarm light or alarm information is displayed. At this time, the repeater 15 does not work and does not send warnings and material shortage information to the receiving end 16 watch.

[0048] (2) Material shortage warning: When the number of rubber rings applied reaches the number of rings set for the warning, the box for the number of rubber rings applied turns yellow, and at the same time, the number of tapes corresponding to the number of tapes in the material ordering board is displayed in yellow, and the alarm light flashes yellow. The alarm information displays the name, specification, and quantity of the material that will cause an early warning of the impending material shortage and shutdown. At this time, the repeater 15 receives the warning information from the material ordering system 14 through the serial port, including the warning equipment, work station, material name, specification, and quantity information, and forwards the information to the receiving end 16 watch in real time for display.

[0049] (3) Material shortage shutdown alarm: If the roll of tape 6 is used up, the tail end of the tape 6 will fall off the rubber ring 5. At this time, the second sensor 2 cannot sense the tape 6, and the material shortage shutdown alarm will be triggered. At this time, the number of rubber rings pasted reaches the number of rubber rings that can be pasted, and the number box of rubber rings pasted turns red. At the same time, the corresponding tape number mark in the material ordering board is displayed in red, and the alarm light flashes red. The alarm information shows the material name, specification, and quantity of the material shortage shutdown. At this time, the repeater 15 receives the shutdown alarm information of the material ordering system 14 through the serial port, including the equipment, work station, material name, specification, and quantity information of the material shortage alarm, and forwards the information to the receiving end 16 watch in real time for display.

[0050] (4) Material replacement: After the material warning or material shortage shutdown alarm is issued, the operator receives the material replenishment information through the material ordering board, the material shortage warning setting panel, and the receiving end 16 watch, then takes the required amount of material and walks to the corresponding workstation of the material shortage equipment, removes the rubber ring 5 of the used tape 6 from the shaft 4. At this time, the second sensor 2 cannot sense the rubber ring 5. The second sensor 2 sends a signal to the host computer 13. The host computer 13 transmits the information to the material shortage warning setting panel of the material ordering system 14 through the API interface, and the number of rubber rings that have been attached is reset to zero. The operator installs the new roll of tape 6 wrapped around the rubber ring 5 on the shaft 4. The second sensor 2 senses the rubber ring 5, and the signal is transmitted to the material ordering system 14 through the host computer 13. At this time, the warning information or alarm information displayed on the material ordering system 14 and the receiving end 16 watch is eliminated. The tape 6 is installed and restored to a usable state. The equipment operates normally and the materials are consumed normally.

[0051] This embodiment uses digital means to provide real-time early warning and alarm for material shortages in the roll tape 6, reducing downtime losses caused by personnel preparing materials and moving around. At the same time, the material call board can visualize the names, specifications, and quantities of materials shortages in all equipment, enabling rapid material preparation. The receiving end 16 watches can perceive material shortage information in the first place, reducing response downtime.

[0052] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which are all protected by the present invention.

Claims

1. A coil material shortage alarm method, characterized in that: include: Get the real-time usage number of coils; Provide material shortage warning based on real-time usage cycles and preset warning cycles; The method for setting the number of warning laps includes: Determine the number of coils reserved based on advance material preparation requirements and process requirements; Set the number of warning circles according to the number of reserved circles of the coil.

2. The coil material shortage alarm method according to claim 1, characterized in that: The method of obtaining the real-time number of coiled material turns includes: Proximity sensing is performed on a sensing block provided on a side wall of the mounting shaft by a first sensor; The real-time number of coil turns is obtained according to the number of approaches sensed by the first sensor.

3. The coil material shortage alarm method according to claim 2, characterized in that: The method of obtaining the real-time number of coil turns according to the number of proximity detected by the first sensor includes: The proximity signal collected by the first sensor is sent to the material calling system, so that the number of used revolutions displayed in the material calling system is increased by one to obtain the real-time number of revolutions of the installation shaft; The real-time number of coiled material revolutions is obtained based on the real-time number of revolutions of the mounting shaft.

4. The coil material shortage alarm method according to claim 3, characterized in that: The material shortage warning is performed based on the real-time usage number of circles and the preset warning number of circles, including: when the used number of circles displayed in the material ordering system is superimposed on the warning number of circles, the material ordering system issues a corresponding warning alarm.

5. The coil material shortage alarm method according to claim 1, characterized in that: The method of determining the number of coils to be reserved based on advance material preparation requirements and process requirements includes: Determine the standard length and duration of a single use of coil material according to process requirements; Determine the number of coils reserved based on advance material preparation requirements and the standard length and duration of single material usage.

6. The coil material shortage alarm method according to claim 5, characterized in that: The number of coils reserved is determined based on advance material preparation requirements and the standard length and duration of a single material usage, including: Determine the number of times the coil is reserved for use based on the time required for advance material preparation and the standard time for a single use of the material; Determine the reserved length of the coil according to the number of times the coil is reserved for use and the standard length of a single use; The number of coils to be reserved is determined based on the coil length to be reserved.

7. The coil material shortage alarm method according to claim 1, characterized in that: The step of setting the number of warning circles according to the reserved number of circles of the coil includes: Determine the number of coils that can be used based on coil specifications; The number of warning circles is determined based on the number of available circles and the number of reserved circles for the coil.

8. The coil material shortage alarm method according to claim 3, characterized in that: The alarm method further includes: The coil core is sensed by the second sensor. When the coil core is sensed to be missing, a missing signal is sent to the material calling system, so that the number of used coils displayed in the material calling system is reset to zero.

9. The coil material shortage alarm method according to claim 3, characterized in that: The alarm method further includes: The coil discharge point is sensed by a third sensor. When it is sensed that the coil discharge point is vacant, a vacancy signal is sent to the material calling system, causing the material calling system to issue a corresponding shutdown alarm. The coil discharge point is located on the coil discharge section between the coil discharge port and the destination workstation.

10. A coil material shortage alarm device, characterized in that: include: Sensing module, material calling system and host computer; The sensing module is connected to the host computer, and includes a first sensor, a second sensor, and a third sensor; The first sensor is arranged on one side of the coil installation shaft, and the connection line between the first sensor and the sensing block arranged on the side wall of the installation shaft is perpendicular to the axis diameter of the installation shaft, and is used to perform proximity sensing on the sensing block and send the proximity sensing signal to the host computer; The second sensor is provided at one end of the coil core and is used to sense the presence of the coil core and send a material change sensing signal to the host computer; The third sensor is arranged on one side of the coil discharging place, and is used to sense the presence of the coil discharging place and send a material shortage sensing signal to the host computer, wherein the coil discharging place is located on the coil discharging section between the coil discharging port and the destination station; The material calling system is connected to the host computer, and is used to adjust the display value of the number of used turns according to the proximity sensing signal and the material change sensing signal sent by the host computer, and to issue corresponding alarms according to the display value of the number of used turns and the material shortage sensing signal; The host computer is used to execute the coil material shortage alarm method according to any one of claims 1 to 9.

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