A device and method for preventing loose winding of an inner circle of a steel coil

Abstract

The application discloses a device for preventing loose winding of an inner circle of a steel coil, comprising a ground roller mechanism; the ground roller mechanism is arranged on both sides of a coil carrying trolley and is used for adjusting the positioning of the head of the inner circle of the steel coil on the coil carrying trolley; the ground roller mechanism comprises two symmetrically arranged supporting frames, the coil carrying trolley is located between the two supporting frames; one of the supporting frames is provided with a driving ground roller unit, and the other supporting frame is provided with a driven ground roller; the ground roller mechanism is used for driving the steel coil to rotate, so that the head of the inner circle of the steel coil is positioned at any position between 3 o'clock and 9 o'clock. The application further discloses a method for preventing loose winding of an inner circle of a steel coil. The application is aimed at the problem of the inner circle of steel grades such as 50CrV4 and 58CrV4 with a thickness less than 2.9 mm in the process of uncoiling, transportation and storage, and the problem of loose winding of the inner circle is solved by adding a ground roller at a coiling outlet and positioning the head of the steel coil at a special position of the inner circle through the ground roller.

Description

Technical Field

[0001] This invention relates to hot rolling coiling technology, and more specifically, to a device and method for preventing the inner coil of a steel coil from loosening. Background Technology

[0002] The coiler is a crucial piece of equipment in a hot rolling production line, used to coil hot-rolled strip steel into coils. Located after the finishing mill, the coiler is the final step in the hot continuous rolling production line.

[0003] Please see Figure 1 The coiler mainly includes equipment such as an auxiliary coiling roller 1, a coil drum 2, and an unwinding trolley 3. The auxiliary coiling roller 1 helps to bend the strip steel and tightly wrap it around the coil drum 2. After the strip steel is wrapped around the coil drum, tension is applied to it, and the steel plate is rolled into a coil.

[0004] The existing uncoiling process is as follows: After the steel coil is wound up, the uncoiling trolley 3 rises to support the coil, and the drum 2 retracts. The uncoiling trolley is responsible for delivering the steel coil to the bundling machine for bundling, and then the coil transport trolley transports the steel coil to the pallet. The pallet transports the steel coil to the finishing or cold rolling process.

[0005] When producing certain steel grades, loosening of the inner coil is a common problem, especially for grades like 50CrV4 and 58CrV4 with a thickness of less than 2.9mm. These steel grades undergo pearlitic or bainitic phase transformations during coiling and after uncoiling, causing the strip to expand in volume and elongate significantly, leading to loosening. Severe loosening of the inner coil reduces its diameter, making it impossible to directly load the coil onto the drum during subsequent processes.

[0006] Please see Figure 2 The principle of inner coil loosening is that if the inner coil head 41 of the steel coil 4 is set at position 2, the inner coil head 41 will droop downward under the action of strip volume expansion and gravity, which will aggravate the occurrence of inner coil loosening.

[0007] The current method involves removing several inner coils using flame cutting until the inner diameter exceeds the drum diameter. However, while removing these inner coils to address the loose coil issue, this method suffers from several drawbacks: reduced yield, low cutting efficiency, and high labor intensity. The inner coil problem is common in hot strip rolling mills, and is typically addressed by altering the strip coiling temperature or changing the cooling mode. However, these methods can negatively impact performance and increase the risk of scrap. Summary of the Invention

[0008] To address the shortcomings of existing technologies, the present invention aims to provide a device and method for preventing the inner coil of steel coils from loosening. Specifically addressing the issue of inner coil loosening during uncoiling, transportation, and storage of steel grades such as 50CrV4 and 58CrV4 with a thickness less than 2.9mm, the invention solves this problem by adding a ground roller at the coiling exit and positioning the head of the steel coil at a specific position within the inner coil.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] The first aspect of the present invention provides a device for preventing the inner coil of a steel coil from unwinding, including a ground roller mechanism;

[0011] The ground roller mechanism is located on both sides of the coil transport trolley and is used to adjust the positioning of the inner head of the steel coil on the coil transport trolley.

[0012] The ground roller mechanism includes two symmetrically arranged support frames, and the winding trolley is located between the two support frames;

[0013] One of the support frames is equipped with an active ground roller unit, and the other support frame is equipped with a passive ground roller;

[0014] The ground roller mechanism is used to drive the steel coil to rotate, so that the inner head of the steel coil is fixed at any position between 3 o'clock and 9 o'clock.

[0015] Preferably, the support frame is configured as a stepped frame structure.

[0016] Preferably, the active roller unit includes a hydraulic motor, a drive gear, a chain, and an active roller;

[0017] The output side of the hydraulic motor is connected to the drive gear;

[0018] The drive gear is connected to the drive roller via a chain for transmission.

[0019] The active roller is located at the top of the support frame.

[0020] Preferably, the hydraulic motor is equipped with an encoder.

[0021] Preferably, the passive roller is located at the top of the support frame.

[0022] The second aspect of the present invention provides a method for preventing the inner coil of a steel coil from unwinding, wherein the device for preventing the inner coil of a steel coil from unwinding as described in the first aspect of the present invention is used for unwinding:

[0023] After the steel coil is wound up, the unloading trolley rises to support the steel coil, and the drum retracts.

[0024] The unloading trolley delivers the steel coil to the bundling machine for bundling, and then the transport trolley transports the steel coil to the ground roller mechanism.

[0025] The ground roller mechanism drives the steel coil to rotate the inner head position of the steel coil to any position between 3 o'clock and 9 o'clock;

[0026] The coil transport trolley then transports the steel coil to a pallet;

[0027] Finally, the pallet transports the steel coil to the finishing or cold rolling process.

[0028] Preferably, the method for preventing the inner coil of the steel coil from unwinding specifically includes the following steps:

[0029] S1, Start;

[0030] S2, issue the unload command;

[0031] S3, the unloading trolley transports the steel coil to the bundling machine position;

[0032] S4, the baler performs baling;

[0033] S5, determine whether the steel coil is less than 2.9mm thick and the steel type is a specified grade. If so, the coil transport trolley transports the steel coil to the ground roller mechanism position and executes step S6.

[0034] S6, the ground roller mechanism rotates the inner head position of the steel coil to any position between 3 and 9 o'clock;

[0035] S7, the coil transport trolley transports the steel coil to the pallet position;

[0036] S8, End.

[0037] Preferably, in step S5, it is determined whether the steel coil has a thickness of less than 2.9 mm and is of a specified steel grade. If not, the following operation is performed:

[0038] The coil transport trolley directly transports the steel coil to the pallet position and then the process ends.

[0039] This invention provides a device and method for preventing the inner coil of steel coils from loosening during uncoiling, transportation, and storage of steel grades such as 50CrV4 and 58CrV4 with a thickness of less than 2.9mm. The problem is solved by positioning the head of the steel coil at a specific position on the exit roller of the coiling unit, thus preventing the inner coil from loosening. This invention effectively reduces yield loss, reduces the need for cutting the inner coil, improves efficiency, and reduces safety hazards. Attached Figure Description

[0040] Figure 1This is a schematic diagram of the winding machine;

[0041] Figure 2 This is a schematic diagram showing that the inner coil of the steel coil has become loose at the head position;

[0042] Figure 3 This is a schematic diagram of the structure of the device for preventing the inner coil of a steel coil from unwinding according to the present invention;

[0043] Figure 4 yes Figure 3 A diagram showing the view from the right.

[0044] Figure 5 This is a schematic diagram illustrating the principle of the method for preventing the inner coil of a steel coil from unwinding according to the present invention;

[0045] Figure 6 This is a schematic diagram showing that the inner head of the steel coil is located at the 9 o'clock position in the method for preventing the inner coil of the steel coil from loosening in this invention. Detailed Implementation

[0046] To better understand the above-mentioned technical solutions of the present invention, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0047] Combination Figure 3 and Figure 4 As shown, the present invention provides a device for preventing the inner coil of a steel coil from unwinding, including a ground roller mechanism;

[0048] The ground roller mechanism is located on both sides of the coil transport trolley 5 to adjust the positioning of the inner ring head 61 of the steel coil 6 on the coil transport trolley 5.

[0049] The ground roller mechanism includes two symmetrically arranged support frames 7, and the winding trolley 5 is located between the two support frames 7.

[0050] One of the support frames 7 is equipped with an active ground roller unit, and the other support frame 7 is equipped with a passive ground roller 8.

[0051] The ground roller mechanism is used to place the steel coil 6 and drive the steel coil 6 to rotate (clockwise or counterclockwise) so that the inner head 61 of the steel coil 6 can be fixed at any position between 3 o'clock and 9 o'clock.

[0052] If the inner head 61 of the steel coil 6 can be fixed at any position between 3 o'clock and 9 o'clock, the inner head 61 of the steel coil 6 cannot be blown down, which can effectively solve the problem of the inner coil unwinding.

[0053] The support frame 7 is designed as a stepped frame structure.

[0054] The active roller unit includes a hydraulic motor 9, an active gear 10, a chain 11, and an active roller 12.

[0055] The output side of the hydraulic motor 9 is connected to the drive gear 10.

[0056] The drive gear 10 is connected to the drive roller 12 via the chain 11.

[0057] The active roller 12 is located at the top of the support frame 7, and the passive roller 8 is located at the top of the support frame 7. The active roller 12 and the passive roller 8 are arranged symmetrically to place and drive the steel coil 6.

[0058] An encoder is also installed on the hydraulic motor 9.

[0059] Combination Figure 5 and Figure 6 As shown, the present invention also provides a method for preventing the inner coil of a steel coil from unwinding, and the unwinding operation is performed using the device for preventing the inner coil of a steel coil from unwinding according to the present invention:

[0060] After the steel coil 6 is wound up, the unloading trolley 13 rises to support the steel coil 6, and the drum 14 retracts.

[0061] The unloading trolley 13 carries the steel coil 6 to the bundling machine 15 for bundling. Then, the transport trolley 16 transports the steel coil 6 to the ground roller mechanism 17 of the device for preventing the inner ring of the steel coil from loosening according to the present invention.

[0062] In the roller mechanism, the hydraulic motor 9 drives the drive gear 10, which drives the drive roller 12 via the chain 11 to rotate the steel coil 6. Then, the passive roller 8 cooperates to rotate the inner head 61 of the steel coil 6 to any position between 3 o'clock and 9 o'clock.

[0063] The trolley 16 then transports the steel coil 6 to the pallet 17.

[0064] Finally, pallet 17 transports steel coil 6 to the finishing or cold rolling process.

[0065] The method for preventing the inner coil of a steel coil from unwinding according to the present invention specifically includes the following steps:

[0066] S1, Start;

[0067] S2, issue the unload command;

[0068] S3, the unloading trolley 13 transports the steel coil 6 to the position of the bundling machine 15;

[0069] S4, baler 15 performs baling;

[0070] S5, determine whether the steel coil is less than 2.9mm thick and the steel grade is 50CrV4 and 58CrV4. If so, the coil transport trolley 16 transports the steel coil 6 to the ground roller mechanism position and executes step S6.

[0071] S6, the ground roller mechanism drives the steel coil 6 to rotate. When the inner head 61 of the steel coil 6 rotates to any position between 3 and 9 o'clock, the ground roller mechanism can be stopped.

[0072] S7, the coil transport trolley 16 transports the steel coil 6 to the pallet 17 position;

[0073] S8, End.

[0074] In step S5 above, it is determined whether the steel coil has a thickness of less than 2.9 mm and is of steel grade 50CrV4 or 58CrV4. If not, the following operation is performed:

[0075] The process ends after the steel coil 6 is transported directly to the pallet 17 by the coil transport trolley 16.

[0076] Example

[0077] This embodiment takes the coiling unit of hot-rolled 2050 unit as an example.

[0078] Combined Figure 3 and Figure 4 As shown, the active roller unit includes a hydraulic motor 9, an active gear 10, a chain 11, and an active roller 12.

[0079] The output side of the hydraulic motor 9 is connected to the drive gear 10.

[0080] The drive gear 10 is connected to the drive roller 12 via the chain 11.

[0081] The active roller 12 is located at the top of the support frame 7, and the passive roller 8 is located at the top of the support frame 7. The active roller 12 and the passive roller 8 are arranged symmetrically to place and drive the steel coil 6.

[0082] The hydraulic motor 9 is equipped with an encoder to obtain the rotation angle of the drive roller 12.

[0083] The roller has a diameter of 400mm, and the encoder generates 1024 pulse signals per revolution.

[0084] The hydraulic motor 9 drives the active roller 12 to rotate the steel coil 6 clockwise. First, it is necessary to determine the correspondence between the flow meter pulse signal and the arc length of the steel coil 6 rotating on the idler rollers (active roller 12 and passive roller 8). In this embodiment, the arc length of the steel coil 6 rotating on the idler rollers is 1256mm, which generates 1024 pulse signals, i.e., 1.23mm / pulse.

[0085] After coil 6 is wound up, the basic automation computer obtains the actual radius of coil 6 as 1050mm through the roll gap of the auxiliary winding roller. Based on the radius, the arc length L corresponding to the coil at 30 degrees is calculated as L = 2πr*30 / 360 = 2*3.14*1050*30 / 360≈550mm, and the number of pulses is 550 / 1.23≈447.

[0086] For example, when uncoiling, if the inner head 61 of the steel coil 6 is at the 2 o'clock position, the inner head 61 of the steel coil 6 needs to be selected to the 9 o'clock position on the ground roller mechanism. This requires a rotation of 30*7=210 degrees. The arc length L corresponding to 210 degrees is L=2πr*270 / 360=2*3.14*1050*210 / 360=3847mm, and the number of pulses generated is 3847 / 1.23≈3128.

[0087] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any variations or modifications to the above embodiments that are within the spirit and essence of the present invention will fall within the scope of the claims of the present invention.

Claims

1. A device for preventing the inner coil of a steel coil from unwinding, characterized in that: Including the floor roller mechanism; The ground roller mechanism is located on both sides of the coil transport trolley and is used to adjust the positioning of the inner head of the steel coil on the coil transport trolley. The ground roller mechanism includes two symmetrically arranged support frames, and the winding trolley is located between the two support frames; One of the support frames is equipped with an active ground roller unit, and the other support frame is equipped with a passive ground roller; The ground roller mechanism is used to drive the steel coil to rotate, so that the inner head of the steel coil is fixed at any position between 3 o'clock and 9 o'clock.

2. The device for preventing the inner coil of a steel coil from unwinding according to claim 1, characterized in that: The support frame is configured as a stepped frame structure.

3. The device for preventing the inner coil of a steel coil from unwinding according to claim 2, characterized in that: The active roller unit includes a hydraulic motor, a drive gear, a chain, and an active roller; The output side of the hydraulic motor is connected to the drive gear; The drive gear is connected to the drive roller via a chain for transmission. The active roller is located at the top of the support frame.

4. The device for preventing the inner coil of a steel coil from unwinding according to claim 3, characterized in that: The hydraulic motor is equipped with an encoder.

5. The device for preventing the inner coil of a steel coil from unwinding according to claim 2, characterized in that: The passive roller is located at the top of the support frame.

6. A method for preventing the inner coil of a steel coil from unwinding, characterized in that, Uncoiling is performed using the anti-loosening device for the inner coil of the steel coil as described in any one of claims 1-5: After the steel coil is wound up, the unloading trolley rises to support the steel coil, and the drum retracts. The unloading trolley delivers the steel coil to the bundling machine for bundling, and then the transport trolley transports the steel coil to the ground roller mechanism. The ground roller mechanism drives the steel coil to rotate the inner head position of the steel coil to any position between 3 o'clock and 9 o'clock; The coil transport trolley then transports the steel coil to a pallet; Finally, the pallet transports the steel coil to the finishing or cold rolling process.

7. The method for preventing the inner coil of a steel coil from unwinding according to claim 6, characterized in that, The specific method for preventing the inner ring of the steel coil from unwinding Includes the following steps: S1, Start; S2, issue the unload command; S3, the unloading trolley transports the steel coil to the bundling machine position; S4, the baler performs baling; S5, determine whether the steel coil is less than 2.9mm thick and the steel type is a specified grade. If so, the coil transport trolley transports the steel coil to the ground roller mechanism position and executes step S6. S6, the ground roller mechanism rotates the inner head position of the steel coil to any position between 3 and 9 o'clock; S7, the coil transport trolley transports the steel coil to the pallet position; S8, End.

8. The method for preventing the inner coil of a steel coil from unwinding according to claim 7, characterized in that, In step S5, it is determined whether the steel coil has a thickness of less than 2.9 mm and is of a specified steel grade. If not, the following operation is performed: The coil transport trolley directly transports the steel coil to the pallet position and then the process ends.

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