Control system, method and device for stable unloading of cold rolled steel coils

Abstract

The object of the present invention is to disclose a control system, method and device for smooth unloading of cold-rolled steel coils, comprising a coil unloading trolley, a cold-rolling production line and a coil unloading control module; the coil unloading trolley lifts a lifting arm through a telescopic oil cylinder, and the top surface of the lifting arm is a lifting surface; the cold-rolling production line is provided with a mandrel and a mandrel bracket, and the cold-rolled steel is wound around the mandrel to form a steel coil, the maximum width of the steel coil is L, and a first photoelectric sensor is provided on the moving side of the steel coil, and the distance A between the first photoelectric sensor and the center line of the cold-rolling production line is greater than 0.5L, and the light beam of the first photoelectric sensor is close to the surface of the mandrel. The beneficial effect of the present invention is that the first photoelectric sensor can sense the arrival and departure of the steel coil, and judge the deviation degree of the steel coil by relative displacement, thereby realizing the relative displacement of the steel coil and the coil unloading trolley twice, so that the deviation degree of the steel coil can be controlled to avoid rolling over.

Description

Technical Field

[0001] The present invention relates to the technical field of steel metallurgy, and in particular to a control system, method and device for stably unloading cold rolled steel coils. Background Art

[0002] The steel coils coiled at the outlet of the cold rolling mill need to be unloaded. When unloading, if the mandrel is stuck or fails to move with the unloading trolley in time, the center of the steel coil will deviate from the center line of the lifting surface of the unloading trolley. If the deviation is too much, it will further cause the steel coil to roll over, which will damage the surrounding equipment and cause major equipment accidents, resulting in a long-term shutdown of the cold rolling production line.

[0003] The possible reasons for the inconsistency between the forward distance of the unloading trolley and the forward distance of the steel coil, which leads to the coiling of the steel coil, are listed as follows: (1) Design defects: There are inherent deficiencies in the high-position coiling of the steel coil. After the high-position coiling of the steel coil, the extension length of the lifting arm of the unloading trolley is about 2000mm. When unloading the coil, the hydraulic oil will be compressed by 6mm to 7mm due to the gravity of the steel coil, thereby reducing the gap between the inner ring of the steel coil and the mandrel. The steel coil is likely to rub against the mandrel, causing the steel coil to get stuck and not move forward with the unloading trolley; (2): The lifting arm of the unloading trolley is misaligned with the mandrel, the lifting cylinder of the unloading trolley fails, the mandrel is not fully expanded or contracted, the track of the unloading trolley sinks, etc., which reduces the gap between the inner ring of the steel coil and the mandrel, and the steel coil is likely to rub against the mandrel. The steel coil may rub against the mandrel, causing the steel coil to get stuck and fail to move forward with the unloading trolley; (3) There are nodules, broken steel sheets, etc. on the mandrel, which may cause the mandrel to fail to expand and contract, reducing the gap between the inner ring of the steel coil and the mandrel. The steel coil is likely to rub against the mandrel, causing the steel coil to get stuck and fail to move forward with the unloading trolley; (4) The design range of the steel thickness of the continuous rolling line product is 0.25mm to 2.5mm, while the actual maximum thickness in production is 3.2mm, and it is made of high-strength steel. When the rising arm of the unloading trolley receives the steel coil, the mandrel shrinks and the inner ring of the steel coil takes the lead and bounces up. Because it is made of high-strength steel and the strip is very thick, the distance between the inner ring and the mandrel of the coiler is small and the friction is very large. The steel coil is likely to rub against the mandrel, causing the steel coil to get stuck and fail to move forward with the unloading trolley.

[0004] In view of this, it is necessary to improve the control system, method and device for smooth unloading of cold rolled steel coils in the prior art to solve the technical problem of steel coil turning. Summary of the invention

[0005] The purpose of the present invention is to disclose a control system, method and device for the smooth unloading of cold rolled steel coils, by setting up multiple sensors to detect the relative displacement of the steel coils and the unloading trolley to monitor the degree to which the steel coils deviate from the unloading trolley, thereby preventing the coils from turning over.

[0006] To achieve the above first invention objective, the present invention provides a control system for smooth unloading of cold rolled steel coils, comprising an unloading trolley, a cold rolled production line and an unloading control module;

[0007] The coil unloading trolley lifts the lifting arm through the telescopic oil cylinder, and the top surface of the lifting arm is the lifting surface;

[0008] The cold rolling production line is provided with a mandrel and a mandrel bracket, and the cold rolled steel is wound around the mandrel to form a steel coil. The maximum width of the steel coil is L, and a first photoelectric sensor is arranged on the moving side of the steel coil. The distance A between the first photoelectric sensor and the center line of the cold rolling production line is greater than 0.5L, and the light beam of the first photoelectric sensor is in close contact with the surface of the mandrel.

[0009] As a further improvement of the present invention, a second photoelectric sensor is further included, wherein the second photoelectric sensor and the first photoelectric sensor are located on the same side, and a light beam of the second photoelectric sensor is in close contact with the outer end surface of the core shaft.

[0010] As a further improvement of the present invention, an electromagnetic induction sensor is arranged on the lifting surface of the coil unloading trolley.

[0011] As a further improvement of the present invention, the distance between the electromagnetic induction sensor and the center line of the lifting surface is 400 mm.

[0012] As a further improvement of the present invention, during the operation of the coil unloading trolley, if the electromagnetic induction sensor does not sense the steel coil, an alarm is sounded and the coil unloading trolley stops running.

[0013] As a further improvement of the present invention, when the coil unloading trolley advances a distance greater than 3000 mm, if the second photoelectric sensor detects the steel coil, the coil unloading trolley stops running.

[0014] As a further improvement of the present invention, the maximum width L of the steel coil is 1600 mm.

[0015] To achieve the above second invention objective, the present invention provides a control method for the smooth unloading of cold-rolled steel coils, characterized in that the control system for the smooth unloading of cold-rolled steel coils described in the first invention is adopted, comprising the following steps:

[0016] Place the steel coil on the lifting surface of the coil unloading trolley and start the coil unloading trolley;

[0017] When the first photoelectric sensor senses the steel coil for the first time, the displacement of the unloading trolley relative to the ground is S2, and the displacement of the steel coil relative to the ground is S3;

[0018] Then the first displacement of the steel coil relative to the unloading trolley is S1 = S2-S3;

[0019] When S1 is greater than or equal to 80mm, an alarm is issued.

[0020] As a further improvement of the present invention, the following steps are also included:

[0021] When the first photoelectric sensor sensed the steel coil for the last time, the displacement of the unloading trolley relative to the ground was S5, and the displacement of the steel coil relative to the ground was S6;

[0022] Then the second displacement of the steel coil relative to the unloading trolley is S4=S5-S6;

[0023] When S4 is greater than or equal to 130mm, the unloading trolley stops running.

[0024] In order to achieve the above third invention objective, the present invention provides a cold rolling device, including a control system for smooth unloading of cold rolled steel coils as described in the first invention.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] A first photoelectric sensor is arranged on the side of the core shaft support, the distance A between the first photoelectric sensor and the center line of the cold rolling production line is greater than 0.5L, and the light beam of the first photoelectric sensor is in close contact with the surface of the core shaft; the first photoelectric sensor can sense the arrival and departure of the steel coil, record the arrival time of the steel coil, and compare whether the relative displacement of the steel coil and the ground at this moment is equal to the relative displacement of the unloading trolley and the ground to judge the deviation degree of the steel coil; record the departure time of the steel coil, and compare whether the relative displacement of the steel coil and the ground at this moment is equal to the relative displacement of the unloading trolley and the ground to judge the deviation degree of the steel coil, thereby realizing the two-time judgment of the relative displacement of the steel coil and the unloading trolley, so that the deviation degree of the steel coil can be controlled to avoid rolling. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a diagram showing the relative positions of the steel coil and the lifting arm of the present invention.

[0028] 1. Telescopic cylinder; 2. Lifting arm; 21. Lifting surface; 3. Mandrel; 4. Steel coil; 41. First photoelectric sensor; 42. Second photoelectric sensor; 43. Electromagnetic induction sensor. DETAILED DESCRIPTION

[0029] The present invention is described in detail below in conjunction with the various embodiments shown in the accompanying drawings, but it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in the field based on these embodiments are all within the scope of protection of the present invention.

[0030] The specific implementation process of the present invention is described below through multiple embodiments.

[0031] Embodiment 1:

[0032] Ginseng Figure 1 As shown, this embodiment discloses a specific implementation of a control system for smooth unloading of cold rolled steel coils (hereinafter referred to as "control system").

[0033] Ginseng Figure 1 As shown, in this embodiment, a control system for smooth unloading of cold-rolled steel coils comprises a coil unloading trolley, a cold-rolled production line and a coil unloading control module; the coil unloading trolley lifts a lifting arm 2 through a telescopic cylinder 1, and the top surface of the lifting arm 2 is a lifting surface 21; the cold-rolled production line is provided with a mandrel 3 and a mandrel bracket, and the cold-rolled steel is wound around the mandrel to form a steel coil 4, and the maximum width of the steel coil 4 is L, and a first photoelectric sensor 41 is provided on the moving side of the steel coil, and a distance A between the first photoelectric sensor 41 and a center line x of the cold-rolled production line is greater than 0.5L, and the light beam of the first photoelectric sensor 41 is in close contact with the surface of the mandrel 3.

[0034] Specifically, Figure 1 It is the relative position relationship between the steel coil 4 and the lifting arm 2. The cold rolling production line itself is a prior art. Therefore, the cold rolling production line is not shown in the figure and does not affect the understanding of technical personnel in this field. In addition, the purpose of the mandrel bracket is to lift the mandrel 3. The mandrel bracket itself is also a prior art and is not shown in the figure, which also does not affect the understanding of technical personnel in this field.

[0035] The center line of the cold rolling production line Figure 1 The dotted line x in the figure, and the center line of the mandrel is shown in Figure 1 The dotted line y of the coil moving side refers to the forward direction of the coil unloading trolley. Figure 1The first photoelectric sensor 41 is an infrared photoelectric sensor. To ensure that the first photoelectric sensor 41 can sense the arrival and departure of the steel coil 4 of any width, the distance A between the first photoelectric sensor 41 and the center line x of the cold rolling production line is greater than 0.5L, where L is the maximum width of the steel coil 4 (taking L as 1600mm as an example, the distance A is preferably 1135mm, and the distance between the first photoelectric sensor 41 and the near end surface of the steel coil is 335mm), that is, the first photoelectric sensor 41 will not sense the steel coil when the steel coil 4 is not displaced. After the steel coil 4 is placed stably on the lifting surface 21, the unloading trolley starts, and when the first photoelectric sensor 41 senses the arrival of the steel coil, the sensing signal is transmitted to the unloading control module. According to the time period from the start to the sensing of the arrival of the steel coil, and the moving speed of the unloading trolley, the displacement of the unloading trolley relative to the ground can be obtained as S2, and then according to the distance between the first photoelectric sensor 41 and the proximal end face of the steel coil 4, the displacement of the steel coil relative to the ground can be obtained as S3. Then, the displacement S1 of the steel coil 4 relative to the unloading trolley is S2-S3. If S1 is greater than 0, it means that the steel coil 4 has deviated relative to the unloading trolley. When S1 exceeds 80mm, an alarm is issued by the unloading control module. When the first photoelectric sensor 41 senses the steel coil leaving, the sensing signal is transmitted to the unloading control module. According to the time period from starting to sensing the steel coil leaving, and the moving speed of the unloading trolley, the displacement of the unloading trolley relative to the ground can be obtained as S5. According to the distance between the first photoelectric sensor 41 and the far end face of the steel coil 4, the displacement of the steel coil relative to the ground can be obtained as S6. Then, the displacement S4 of the steel coil 4 relative to the unloading trolley = S5-S6. If S4 is greater than 0, it means that the steel coil 4 has deviated relative to the unloading trolley. When S4 exceeds 130mm, the unloading control module sends a stop signal to the unloading trolley to stop the unloading trolley from moving, thereby implementing two anti-rolling measures.

[0036] In order to further prevent the steel coil 4 from rolling over, the first photoelectric sensor 41 is set up, and also includes a second photoelectric sensor 42. The second photoelectric sensor 42 is an infrared photoelectric sensor. The second photoelectric sensor 42 is on the same side as the first photoelectric sensor 41, that is, the second photoelectric sensor 42 is located on the side of the core shaft 3. The light beam of the second photoelectric sensor 42 is close to the outer end surface of the core shaft 4. When the unloading trolley moves forward a distance greater than 3000 mm, if the second photoelectric sensor detects a steel coil, the unloading trolley stops running.

[0037] Specifically, the process of the coil unloading trolley moving forward is actually also the process of the core shaft 3 being pulled out of the steel coil 4. The maximum width of the steel coil is 1600mm. If the steel coil has not deviated, when the coil unloading trolley moves forward more than 3000mm, the second photoelectric sensor 42 should not sense the steel coil 4. In the actual process, when the coil unloading trolley moves forward more than 3000mm, if the second photoelectric sensor 42 detects the steel coil 4, it means that the core shaft 3 has not been completely pulled out and the steel coil 4 is stuck on the core shaft. At this time, the sensing signal of the second photoelectric sensor 42 should be transmitted to the coil unloading control module, and the coil unloading trolley should be stopped to prevent the steel coil from rolling over.

[0038] In order to further prevent the steel coil 4 from rolling over, an electromagnetic induction sensor 43 is arranged on the lifting surface 21 of the unloading trolley. The electromagnetic induction sensor 43 is an electromagnetic induction sensor, which senses a signal when blocked. Since the minimum width of the steel coil 4 is 900 mm, the distance between the electromagnetic induction sensor and the center line of the lifting surface is 400 mm. As long as any steel coil 4 is stably placed on the lifting surface 21, the electromagnetic induction sensor 43 can sense the existence of the steel coil. During the operation of the unloading trolley, if the electromagnetic induction sensor 43 does not sense the steel coil 4, it means that the steel coil 4 has seriously deviated, and an alarm is issued and the unloading trolley stops running. Taking a steel coil with a width of 900 mm as an example, when the steel coil deviates by 50 mm, the electromagnetic induction sensor 43 will not sense the steel coil, the steel coil deviates, and an alarm is issued. Taking a steel coil with a width of 1600 mm as an example, when the steel coil deviates by 400 mm, the electromagnetic induction sensor 43 will not sense the steel coil, the steel coil deviates, and an alarm is issued.

[0039] Through the above embodiment, under the detection of the first photoelectric sensor 41, the second photoelectric sensor 42 and the electromagnetic induction sensor 43, when the steel coil deviates from the lifting surface by 80mm, 130mm, 50mm-400mm, or when the steel coil is stuck on the core shaft, an alarm or stop signal can be given through the unloading control module, and a steel coil deviation signal can be given through multiple photoelectric sensors, thereby preventing the possibility of the steel coil rolling over.

[0040] Embodiment 2:

[0041] This embodiment discloses a specific implementation method of a control method for smooth unloading of cold rolled steel coils (hereinafter referred to as “control method”).

[0042] A control method for smooth unloading of cold rolled steel coils adopts the control system for smooth unloading of cold rolled steel coils described in Example 1, comprising the following steps:

[0043] S1: Place the steel coil on the lifting surface of the coil unloading trolley and start the coil unloading trolley;

[0044] S2: When the first photoelectric sensor senses the steel coil for the first time, the displacement of the unloading trolley relative to the ground is S2, and the displacement of the steel coil relative to the ground is S3;

[0045] S3: The first displacement of the steel coil relative to the unloading trolley is S1 = S2-S3;

[0046] S4: When S1 is greater than or equal to 80mm, an alarm is issued;

[0047] S5: When the first photoelectric sensor senses the steel coil for the last time, the displacement of the unloading trolley relative to the ground is S5, and the displacement of the steel coil relative to the ground is S6;

[0048] S6: the second displacement of the steel coil relative to the unloading trolley is S4 = S5-S6;

[0049] S7: When S4 is greater than or equal to 130mm, the unloading trolley stops running.

[0050] Specifically, after the steel coil 4 is stably placed on the lifting surface 21, the unloading trolley starts, and when the first photoelectric sensor 41 senses the arrival of the steel coil (the first time the steel coil is sensed), the sensing signal is transmitted to the unloading control module. According to the time period from the start to the sensing of the arrival of the steel coil, and the moving speed of the unloading trolley, the displacement of the unloading trolley relative to the ground can be obtained as S2, and then according to the distance between the first photoelectric sensor 41 and the proximal end face of the steel coil 4, the displacement of the steel coil relative to the ground can be obtained as S3. Then, the displacement S1 of the steel coil 4 relative to the unloading trolley is S2-S3. If S1 is greater than 0, it means that the steel coil 4 has deviated relative to the unloading trolley. When S1 exceeds 80mm, an alarm is issued by the unloading control module. When the first photoelectric sensor 41 senses the steel coil leaving (the last time the steel coil was sensed), the sensing signal is transmitted to the unloading control module. According to the time period from starting to sensing the steel coil leaving, and the moving speed of the unloading trolley, the displacement of the unloading trolley relative to the ground can be obtained as S5. According to the distance between the first photoelectric sensor 41 and the far end face of the steel coil 4, the displacement of the steel coil relative to the ground can be obtained as S6. Then, the displacement S4 of the steel coil 4 relative to the unloading trolley = S5-S6. If S4 is greater than 0, it means that the steel coil 4 has deviated relative to the unloading trolley. When S4 exceeds 130mm, the unloading control module sends a stop signal to the unloading trolley to stop the unloading trolley from moving, thereby implementing two anti-rollover measures.

[0051] Embodiment three:

[0052] This embodiment discloses a specific implementation method of a cold rolling device, including the control system for smooth unloading of cold rolling steel coils described in Example 1. When the cold rolling device coils the steel into steel coils, it can ensure that the steel coils do not turn over during the unloading process, thereby achieving safe unloading.

[0053] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

[0054] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0055] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A control method for the stable unloading of cold rolled steel coils, characterized in that: The control system for smooth unloading of cold rolled steel coils includes the following steps: Place the steel coil on the lifting surface of the coil unloading trolley and start the coil unloading trolley; When the first photoelectric sensor senses the steel coil for the first time, the displacement of the unloading trolley relative to the ground is S2, and the displacement of the steel coil relative to the ground is S3; Then the first displacement of the steel coil relative to the unloading trolley is S1 = S2 - S3; When S1 is greater than or equal to 80mm, an alarm is issued; When the first photoelectric sensor senses the arrival of the steel coil, it transmits the sensing signal to the unloading control module. According to the time period from the start to the sensing of the arrival of the steel coil and the moving speed of the unloading trolley, the displacement of the unloading trolley relative to the ground is obtained as S2. According to the distance between the first photoelectric sensor and the proximal end face of the steel coil, the displacement of the steel coil relative to the ground is obtained as S3. Therefore, the displacement of the steel coil relative to the unloading trolley is S1 = S2-S3. The control system for smooth unloading of cold rolled steel coils comprises an unloading trolley, a cold rolled production line and an unloading control module; The coil unloading trolley lifts the lifting arm through the telescopic oil cylinder, and the top surface of the lifting arm is the lifting surface; The cold rolling production line is provided with a mandrel and a mandrel bracket, and the cold rolled steel is wound around the mandrel to form a steel coil. The maximum width of the steel coil is L, and a first photoelectric sensor is arranged on the moving side of the steel coil. The distance A between the first photoelectric sensor and the center line of the cold rolling production line is greater than 0.5L, and the light beam of the first photoelectric sensor is in close contact with the surface of the mandrel.

2. The method for controlling the smooth unloading of cold rolled steel coils according to claim 1, characterized in that: The following steps are also included: When the first photoelectric sensor sensed the steel coil for the last time, the displacement of the unloading trolley relative to the ground was S5, and the displacement of the steel coil relative to the ground was S6; Then the second displacement of the steel coil relative to the unloading trolley is S4=S5-S6; When S4 is greater than or equal to 130mm, the unloading trolley stops running; When the first photoelectric sensor senses the steel coil leaving, the sensing signal is transmitted to the unloading control module. According to the time period from starting to sensing the steel coil leaving, and the moving speed of the unloading trolley, the displacement of the unloading trolley relative to the ground is obtained as S5. According to the distance between the first photoelectric sensor and the far end face of the steel coil, the displacement of the steel coil relative to the ground can be obtained as S6. Therefore, the displacement of the steel coil relative to the unloading trolley is S4=S5-S6.

3. The method for controlling the smooth unloading of cold rolled steel coils according to claim 1, characterized in that: It also includes a second photoelectric sensor, which is located on the same side as the first photoelectric sensor, and the light beam of the second photoelectric sensor is in close contact with the outer end surface of the core shaft.

4. The method for controlling the smooth unloading of cold rolled steel coils according to claim 3, characterized in that: An electromagnetic induction sensor is arranged on the lifting surface of the coil unloading trolley.

5. The method for controlling the smooth unloading of cold rolled steel coils according to claim 4, characterized in that: The distance between the electromagnetic induction sensor and the center line of the lifting surface is 400 mm.

6. The method for controlling the smooth unloading of cold rolled steel coils according to claim 5, characterized in that: During the operation of the coil unloading trolley, if the electromagnetic induction sensor does not sense the steel coil, an alarm is sounded and the coil unloading trolley stops running.

7. The method for controlling the smooth unloading of cold rolled steel coils according to claim 3, characterized in that: When the coil unloading trolley advances a distance greater than 3000 mm, if the second photoelectric sensor detects a steel coil, the coil unloading trolley stops running; the maximum width L of the steel coil is 1600 mm.

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