Steel coil and mandrel alignment detection device
By using a combination of laser distance sensors and alarms on the steel rolling production line, the collision problem caused by false signals in the steel coil and mandrel alignment detection system was solved, thus achieving safe production and equipment protection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING SHOUGANG AUTOMATION INFORMATION TECH
- Filing Date
- 2025-03-27
- Publication Date
- 2026-05-08
AI Technical Summary
On the steel rolling production line, the steel coil and mandrel alignment detection system is prone to false signals, causing the steel coil to collide with the mandrel, damaging the equipment and affecting the production rhythm.
Multiple laser distance sensors and alarms are used. The laser distance sensors are mounted on the support frame. The laser is parallel to a circle with a radius of R0. The radius of the circle is larger than the radius of the mandrel and smaller than the radius of the inner hole of the steel coil. The controller controls the alarm to turn on or off. The collision risk is judged and an alarm is triggered by detecting whether the laser is blocked.
It effectively avoids collisions between steel coils and mandrels, ensuring safe production on the rolling production line, improving the accuracy and reliability of testing, and reducing equipment damage and production interruptions.
Smart Images
Figure CN224208787U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the technical field of rolling, and particularly relates to a device for detecting the alignment of steel coils and mandrels. Background Technology
[0002] An uncoiler is installed on the steel rolling production line. The function of the uncoiler mandrel is to unwind the steel coil along the rolling production line to facilitate strip rolling.
[0003] The steel coil is mounted on the mandrel via a winding trolley. During transport, the inner hole of the steel coil is aligned with the mandrel. This alignment ensures that the axis of the steel coil and the axis of the mandrel coincide, thus preventing the steel coil from impacting the mandrel.
[0004] Due to factors such as interference from the on-site environment, the alignment system may occasionally produce false signals, meaning the detection data appears normal, but the two axes are not actually aligned. In this situation, if the operator does not detect it in time and continues winding, the steel coil is likely to collide with the mandrel, which will not only damage the steel coil and mandrel equipment, but also affect the production rhythm of the entire rolling line, resulting in significant losses. Utility Model Content
[0005] This application aims to at least partially solve the technical problem in related technologies where steel coils easily collide with mandrels. To this end, this application provides a steel coil and mandrel alignment detection device.
[0006] This application provides a steel coil and mandrel alignment detection device, comprising:
[0007] Support frame;
[0008] Multiple laser distance sensors are mounted on the support frame. The multiple lasers emitted by the multiple laser distance sensors are distributed at intervals on a circle with a radius of R0, and each laser is parallel to the axis of the circle. The radius R0 of the circle is greater than the radius R1 of the mandrel and smaller than the radius R2 of the inner hole of the steel coil.
[0009] An alarm device is installed on the support frame;
[0010] The controller is electrically connected to both the laser distance sensor and the alarm, and controls the opening and closing of the alarm.
[0011] In some embodiments, four laser distance sensors are provided, and the central angle between two adjacent laser distance sensors is 90°.
[0012] In some embodiments, the support frame includes:
[0013] Base;
[0014] A support base is slidably connected to the base along a first direction, which is perpendicular to the axis of the circle. The laser distance sensor and the alarm are both mounted on the support base.
[0015] In some embodiments, the support base includes:
[0016] A first support member is slidably connected to the base along the first direction;
[0017] The second support member is slidably connected to the first support member along the second direction. The second direction, the first direction, and the axis of the circle are perpendicular to each other. The laser distance sensor and the alarm are both installed on the second support member.
[0018] In some embodiments, the second support member includes:
[0019] The upright is arranged along the second direction and is slidably connected to the first support member along the second direction;
[0020] A horizontal bar is provided along the first direction, and the middle part of the horizontal bar is fixedly connected to the middle part of the vertical bar;
[0021] Multiple laser distance sensors are respectively installed on the upright and the crossbar, and the alarm is installed on the upright or the crossbar.
[0022] In some embodiments, the laser distance sensor mounted on the upright is slidably connected to the upright along the second direction, and the laser distance sensor mounted on the crossbar is slidably connected to the crossbar along the first direction.
[0023] In some embodiments, four laser distance sensors are provided, and the four laser distance sensors are respectively installed on both sides of the upright and both sides of the crossbar.
[0024] In some embodiments, the alarm is installed at the end of the pole away from the first support member.
[0025] In some embodiments, the alarm is an audible and visual alarm.
[0026] In some embodiments, the laser distance sensor has a voltage output terminal; the controller is a relay, which has a coil and normally open contacts;
[0027] The steel coil and mandrel alignment detection device also includes an electrical wire, which has a main path and a first branch, a second branch, and a third branch electrically connected to one end of the main path;
[0028] The other end of the main circuit is used for electrical connection to the power supply; the first branch is electrically connected to the laser distance sensor; the second branch is electrically connected to the coil of the relay and the voltage output terminal; the third branch is electrically connected to the alarm and the normally open contact.
[0029] When the voltage is released at the voltage output terminal, the coil is energized, and the normally open contact closes to activate the alarm.
[0030] This utility model has at least the following beneficial effects:
[0031] The steel coil and mandrel alignment detection device includes a support frame, an alarm, a controller, and multiple laser distance sensors. The laser distance sensors are mounted on the support frame, and the multiple laser beams emitted by these sensors are spaced apart on a circle of radius R0, with each laser beam parallel to the axis of the circle. The radius R0 of the circle is larger than the radius R1 of the mandrel but smaller than the radius R2 of the inner hole of the steel coil. The laser distance sensors and the alarm are electrically connected to the controller, which controls the alarm's activation and deactivation. With this design, when the steel coil collides with the mandrel, some of the laser beams will be blocked by the end face of the steel coil. The distance value detected by the corresponding laser distance sensor will be less than a preset value, triggering the controller to activate the alarm and alert the user. This effectively prevents collisions and ensures safe production throughout the entire rolling production line. Attached Figure Description
[0032] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0033] Figure 1 A schematic diagram of the detection device in one or more embodiments of this application is shown.
[0034] Figure 2 A schematic diagram is shown showing a laser passing through the inner hole of a steel coil.
[0035] Figure 3 A schematic diagram is shown showing the laser beam being blocked by the end face of a steel coil.
[0036] Figure 4 It shows Figure 2 The left view.
[0037] Figure 5 A circuit diagram of the detection device in one or more embodiments of this application is shown.
[0038] Reference numerals: 100-Detection device, 110-Support frame, 111-Base, 112-Support seat, 1121-First support member, 1126-Upright pole, 1127-Horizontal bar, 1125-Second support member, 120-Laser distance sensor, 121-Voltage output terminal, 130-Alarm, 140-Relay, 141-Coil, 142-Normally open contact, 151-Main circuit, 152-First branch circuit, 153-Second branch circuit, 154-Third branch circuit, 160-First circuit breaker, 170-Second circuit breaker, 180-Regulated power supply, 200-Steel coil, 300-Mandrel. Detailed Implementation
[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0040] It should be noted that all directional indications in the embodiments of this utility model are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indication will also change accordingly. In this utility model, unless otherwise explicitly specified and limited, the terms "connection" and "fixed" should be interpreted broadly. For example, "fixed" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction relationship between two components, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances. In addition, the descriptions involving "first," "second," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0041] In related technologies, if the operator fails to promptly detect the misalignment between the axis of the steel coil 200 and the axis of the mandrel 300 and continues winding, the steel coil 200 is prone to colliding with the mandrel 300. Therefore, there is a technical problem during the winding process where the steel coil 200 is likely to collide with the mandrel 300.
[0042] This application provides a steel coil and mandrel alignment detection device 100, which can at least partially solve the technical problem that the steel coil 200 is prone to colliding with the mandrel 300.
[0043] This application is described below with reference to the accompanying drawings and specific embodiments:
[0044] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the steel coil and mandrel alignment detection device 100 includes: a support frame 110, an alarm 130, a controller, and multiple laser distance sensors 120. The multiple laser distance sensors 120 are all mounted on the support frame 110. Multiple laser beams emitted by the multiple laser distance sensors 120 are spaced apart on a circle of radius R0, and each laser beam is parallel to the axis of the circle. The radius R0 of the circle is greater than the radius R1 of the mandrel 300 and less than the radius R2 of the inner hole of the steel coil 200. The laser distance sensors 120 and the alarm 130 are both electrically connected to the controller, and the controller controls the opening and closing of the alarm 130.
[0045] The support frame 110 serves as the mounting base for supporting the alarm 130 and the laser distance sensor 120. The alarm 130 can be of various types; it can be an audible alarm 130 that emits a specific sound to alert the user, or a flashing alarm 130 that emits a specific light to warn. In some embodiments of this application, the alarm 130 is an audible and visual alarm 130, capable of emitting both sound and light simultaneously, thereby quickly attracting attention in emergency situations and more effectively conveying alarm information.
[0046] It should be noted that when using the steel coil and mandrel alignment detection device 100, it is necessary to ensure that the axis of the circle containing the multiple lasers is coaxial with the axis of the mandrel 300.
[0047] The controller can be mounted on the support frame 110 or on other components. The controller is electrically connected to both the laser distance sensor 120 and the alarm 130, and controls the alarm 130 to turn on or off based on the electrical signal fed back by the laser distance sensor 120.
[0048] like Figure 2 As shown, when the projection of the steel coil 200 does not coincide with the mandrel 300 along the axial direction of the mandrel 300, the laser can pass smoothly through the inner hole of the steel coil 200 without being blocked by the steel coil 200. Figure 3 As shown, when the axes of the mandrel 300 and the steel coil 200 are not coincident, and the projection of the steel coil 200 is located on the mandrel 300 along the laser emission direction (i.e., when the steel coil 200 is at risk of colliding with the mandrel 300), the end face of the steel coil 200 near the laser distance sensor 120 will block one or more laser beams, so that the corresponding laser cannot pass through the inner hole of the steel coil 200.
[0049] When the steel coil 200 collides with the mandrel 300, some of the laser light will be blocked by the end face of the steel coil 200. Therefore, the distance value detected by the corresponding laser distance sensor 120 will decrease. Thus, the distance value detected by the laser distance sensor 120 being less than a set value can be used as a basis for determining whether the steel coil 200 will collide with the mandrel 300. When the distance value detected by any laser distance sensor 120 is less than the preset value, the controller will activate the alarm 130 to alert the user, thereby effectively preventing collisions and ensuring safe production throughout the entire rolling production line.
[0050] In some embodiments, the laser distance sensor 120 detects the distance value and feeds it back to the controller. The controller determines whether the distance value is less than or equal to a set value. When the controller detects that the distance value is less than or equal to the set value, the controller controls the alarm 130 to turn on. When the controller detects that the distance value is greater than the set value, the controller controls the alarm 130 to turn off.
[0051] In some embodiments, the controller is a relay 140, which has a coil 141 and a normally open contact 142. The laser distance sensor 120 can independently determine whether the detected distance value is less than a set value. The laser distance sensor 120 has a voltage output terminal 121. If the detected distance value is less than the set value, the laser distance sensor 120 will send a voltage signal to the coil 141 through the voltage output terminal 121. After receiving the voltage signal from the laser distance sensor 120, the normally open contact 142 of the coil 141 closes, thereby activating the alarm 130.
[0052] like Figure 5As shown, in some embodiments, the laser distance sensor 120 has a voltage output terminal 121; the controller is a relay 140, which has a coil 141 and a normally open contact 142; the steel coil and mandrel alignment detection device 100 also includes a wire having a main circuit 151 and a first branch 152, a second branch 153, and a third branch 154 electrically connected to one end of the main circuit 151; the other end of the main circuit 151 is used for electrical connection to a power source; the first branch 152 is electrically connected to the laser distance sensor 120; the second branch 153 is electrically connected to the coil 141 and the voltage output terminal 121 of the relay 140; and the third branch 154 is electrically connected to the alarm 130 and the normally open contact 142. When the voltage output terminal 121 releases voltage, the coil 141 is energized, and the normally open contact 142 closes, thereby activating the alarm 130. When the voltage output terminal 121 is not released, the coil 141 is de-energized, and the normally open contact 142 opens, thereby turning off the alarm 130.
[0053] It should be noted that in these embodiments, the laser distance sensor 120 can independently determine whether the detected distance value is less than a set value. If the detected distance value is less than the set value, the laser distance sensor 120 will send a voltage signal through the voltage output terminal 121. Power is supplied to the laser distance sensor 120, relay 140, and alarm 130 through wires. It should be noted that the normally open contact 142 is located between the main circuit 151 and the alarm 130. When the normally open contact 142 is not closed, the third branch circuit 154 is open, power cannot supply power to the alarm 130, and the alarm 130 will not sound and is in the off state. When the normally open contact 142 is closed, the third branch circuit 154 is closed, power can supply power to the alarm 130, and the alarm 130 will sound and is in the on state.
[0054] like Figure 5 As shown, in some embodiments, the steel coil and mandrel alignment detection device 100 further includes a first circuit breaker 160, a second circuit breaker 170 and a regulated power supply 180 installed on the main circuit 151. The regulated power supply 180 is located between the first circuit breaker 160 and the second circuit breaker 170. The other end of the main circuit 151 is used to connect to a 220V AC power supply.
[0055] By adding a first circuit breaker 160, a second circuit breaker 170, and a regulated power supply 180 between them on the main road 151, safe access and disconnection control of the 220V AC power supply is achieved, which helps to ensure a stable power supply for the laser distance sensor 120, relay 140, alarm 130, etc., and improves the safety and stability of the system.
[0056] To some extent, increasing the number of laser distance sensors 120 can improve the accuracy and reliability of detection, as more sensors mean more measurement points. However, increasing the number of sensors also leads to increased costs, including sensor purchase costs, installation costs, and subsequent maintenance costs. In some embodiments, four laser distance sensors 120 are provided, with a central angle of 90° between any two adjacent laser distance sensors 120. This configuration can ensure measurement accuracy to a certain extent while reasonably controlling costs, achieving a good trade-off between accuracy and cost.
[0057] In some embodiments, the support frame 110 includes a base 111 and a support base 112. The support base 112 is slidably connected to the base 111 along a first direction, which is perpendicular to the axis of the circle. The laser distance sensor 120 and the alarm 130 are both mounted on the support base 112.
[0058] The base 111 supports the support seat 112. When the steel coil and mandrel alignment detection device 100 is in use, the base 111 is placed on a platform, which can be the ground. To prevent the base 111 from shifting during use, the base 111 can be fixed to the platform with bolts or the like. The support seat 112 is slidably connected to the base 111 along a first direction, allowing the support seat 112 to change position in the first direction. This allows the position of the center of the circle containing the laser to be adjusted in the first direction, enabling the center of the circle containing the laser to be adaptively adjusted according to the position of the axis of the mandrel 300, which helps to ensure the coaxiality of the axis of the mandrel 300 and the axis of the circle containing the laser.
[0059] In some embodiments, the support base 112 includes a first support member 1121 and a second support member 1125. The first support member 1121 is slidably connected to the base 111 along a first direction, and the second support member 1125 is slidably connected to the first support member 1121 along a second direction. The second direction, the first direction, and the axis of the circle are perpendicular to each other. The laser distance sensor 120 and the alarm 130 are both mounted on the second support member 1125.
[0060] The first support member 1121 can slide along the first direction, while the second support member 1125 is connected to the first support member 1121. Therefore, the position of the second support member 1125 along the first direction can be changed. The second support member 1125 can also slide along the second direction, thereby allowing its position to be changed in the second direction. With this design, the center of the circle containing the laser can be adjusted in the plane containing both the first and second directions, ensuring the coaxiality of the axis of the circle containing the laser and the axis of the mandrel 300.
[0061] It should be noted that after the second support member 1125 slides a certain distance along the second direction, it can be fixed in its moved position to prevent displacement. Similarly, after the first support member 1121 slides a certain distance along the first direction, it can be fixed to prevent displacement of the second support member 1125. Users can use bolts, screws, or other fasteners to fix the second support member 1125 and the first support member 1121; this application does not impose any limitations on this method.
[0062] For example, in some embodiments, a second support member 1125 is sleeved outside the first support member 1121. A screw is threaded onto the second support member 1125, and the screw passes through the second support member 1125. When the second support member 1125 needs to be moved, the screw is loosened, causing the screw to separate from the first support member 1121, so that the second support member 1125 can move. After the second support member 1125 is moved into place, the screw is tightened, causing the screw to abut against the first support member 1121, thereby fixing the second support member 1125 and preventing it from moving in the second direction.
[0063] Similarly, in some embodiments, the base 111 has a sliding groove along the first direction, and the first support member 1121 is provided with a slide rail. A screw is threaded onto the side wall of the sliding groove, penetrating the side wall of the sliding groove. When the first support member 1121 needs to be moved, the screw is loosened, causing the screw to separate from the first support member 1121, allowing the first support member 1121 to move. After the first support member 1121 is moved into place, the screw is tightened, causing the screw to abut against the first support member 1121, thereby fixing the first support member 1121 and preventing it from moving in the first direction.
[0064] In some embodiments, the second support member 1125 includes a vertical pole 1126 and a horizontal bar 1127. The vertical pole 1126 is arranged along a second direction and is slidably connected to the first support member 1121 along the second direction. The horizontal bar 1127 is arranged along a first direction, and its middle portion is fixedly connected to the middle portion of the vertical pole 1126. A plurality of laser distance sensors 120 are respectively mounted on the vertical pole 1126 and the horizontal bar 1127, and an alarm 130 is mounted on either the vertical pole 1126 or the horizontal bar 1127. Some laser distance sensors 120 are mounted on the vertical pole 1126, and some are mounted on the horizontal bar 1127. The alarm 130 is mounted on either the vertical pole 1126 or the horizontal bar 1127.
[0065] In some embodiments, a laser distance sensor 120 mounted on a vertical pole 1126 is slidably connected to the vertical pole 1126 in a second direction, and a laser distance sensor 120 mounted on a horizontal bar 1127 is slidably connected to the horizontal bar 1127 in a first direction.
[0066] With this design, the laser distance sensor 120 on the upright 1126 can be adjusted in the second direction, and the laser distance sensor 120 on the crossbar 1127 can be adjusted in the first direction. This allows the radius of the circle containing the laser beam to be adjusted, enabling the steel coil and mandrel alignment detection device 100 to adapt to mandrels 300 with different outer diameters and steel rings 200 with different diameter inner holes, thus facilitating a wider range of applications. It should be noted that after the laser distance sensor 120 slides a certain distance along the first or second direction, it can be fixed in its moved position to prevent displacement. Users can fix the laser distance sensor 120 using bolts, screws, or other fasteners, which is not limited in this application.
[0067] In some embodiments, four laser distance sensors 120 are provided, and the four laser distance sensors 120 are respectively installed on both sides of the upright 1126 and both sides of the crossbar 1127. Figure 1 As shown, two laser distance sensors 120 are mounted on the crossbar 1127 and are respectively positioned on both sides of the crossbar 1127 along the first direction; the other two laser distance sensors 120 are mounted on the vertical pole 1126 and are respectively positioned on both sides of the vertical pole 1126 along the second direction.
[0068] In some embodiments, the alarm 130 is installed at the end of the pole 1126 away from the first support member 1121. The end of the pole 1126 away from the first support member 1121 is at a higher height, so that the sound and light signals emitted by the alarm 130 can be more easily detected by the workers.
[0069] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.
[0070] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.
[0071] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.
Claims
1. A device for detecting the alignment of a steel coil and a mandrel, characterized in that, include: Support frame (110); Multiple laser distance sensors (120) are mounted on the support frame (110). Multiple lasers emitted by the multiple laser distance sensors (120) are distributed at intervals on a circle with a radius of R0, and each laser is parallel to the axis of the circle. The radius R0 of the circle is greater than the radius R1 of the mandrel (300) and less than the radius R2 of the inner hole of the steel coil (200). An alarm (130) is mounted on the support frame (110). The controller is electrically connected to both the laser distance sensor (120) and the alarm (130), and the controller controls the opening and closing of the alarm (130).
2. The steel coil and mandrel alignment detection device according to claim 1, characterized in that, Four laser distance sensors (120) are provided, and the central angle between two adjacent laser distance sensors (120) is 90°.
3. The steel coil and mandrel alignment detection device according to claim 1, characterized in that, The support frame (110) includes: Base (111); Support base (112) is slidably connected to base (111) along a first direction, the first direction being perpendicular to the axis of the circle. The laser distance sensor (120) and the alarm (130) are both mounted on the support base (112).
4. The steel coil and mandrel alignment detection device according to claim 3, characterized in that, The support base (112) includes: The first support member (1121) is slidably connected to the base (111) along the first direction. The second support member (1125) is slidably connected to the first support member (1121) along the second direction. The second direction, the first direction and the axis of the circle are perpendicular to each other. The laser distance sensor (120) and the alarm (130) are both installed on the second support member (1125).
5. The steel coil and mandrel alignment detection device according to claim 4, characterized in that, The second support member (1125) includes: The upright (1126) is arranged along the second direction and is slidably connected to the first support member (1121) along the second direction. A crossbar (1127) is provided along the first direction, and the middle part of the crossbar (1127) is fixedly connected to the middle part of the upright (1126); Multiple laser distance sensors (120) are respectively installed on the upright (1126) and the crossbar (1127), and the alarm (130) is installed on the upright (1126) or the crossbar (1127).
6. The steel coil and mandrel alignment detection device according to claim 5, characterized in that, The laser distance sensor (120) mounted on the upright (1126) is slidably connected to the upright (1126) along the second direction, and the laser distance sensor (120) mounted on the crossbar (1127) is slidably connected to the crossbar (1127) along the first direction.
7. The steel coil and mandrel alignment detection device according to claim 5, characterized in that, Four laser distance sensors (120) are provided, and the four laser distance sensors (120) are respectively installed on both sides of the upright (1126) and both sides of the crossbar (1127).
8. The steel coil and mandrel alignment detection device according to claim 5, characterized in that, The alarm (130) is installed at the end of the pole (1126) away from the first support (1121).
9. The steel coil and mandrel alignment detection device according to any one of claims 1-8, characterized in that, The alarm (130) is an audible and visual alarm (130).
10. The steel coil and mandrel alignment detection device according to any one of claims 1-8, characterized in that, The laser distance sensor (120) has a voltage output terminal (121); the controller is a relay (140), which has a coil (141) and a normally open contact (142). The steel coil and mandrel alignment detection device (100) also includes an electric wire (150), which has a main path (151) and a first branch (152), a second branch (153) and a third branch (154) electrically connected to one end of the main path (151). The other end of the main circuit (151) is used for electrical connection to the power supply; the first branch circuit (152) is electrically connected to the laser distance sensor (120); the second branch circuit (153) is electrically connected to the coil (141) of the relay (140) and the voltage output terminal (121); the third branch circuit (154) is electrically connected to the alarm (130) and the normally open contact (142). When the voltage is released at the voltage output terminal (121), the coil (141) is energized and the normally open contact (142) is closed, so that the alarm (130) is turned on.