A method for improving the uniformity of oil coating on strip surface

Abstract

The present invention relates to a method for improving the uniformity of oil coating on the surface of a strip, including a device for improving the uniformity of oil coating on the surface of the strip. The device includes an intermediate section connected to the process section and an outlet section connected to the intermediate section. An outlet loop is provided on the intermediate section, and an oiling machine and a coiler are arranged on the outlet section along the conveying direction. The steps are as follows: (1) When the outlet section just stops: the speed of the intermediate section is V1; the speed of the outlet section is 0; the loop amount of the outlet loop is 0; (2) When the head of the strip is coiled at the outlet section: the speed of the intermediate section is V1; the speed of the outlet section is V2; the loop amount of the outlet loop is L1; the coiled length of the head of the coiler is L2; (3) It is deduced that when T1≥T2, that is, L1 / (V2 - V1)≥(L - L2) / V2, the whole strip can be kept at a constant speed and the whole strip can be in the uniform speed section for as long as possible; and it is necessary to satisfy L2 - L<0 and L1 + L2 - L<0. The speed of the outlet section set by this method helps to improve the uniformity of oil coating on the surface of the strip.

Description

Technical Field

[0001] The present invention relates to a method for improving the uniformity of oil coating on the surface of a strip. Background Art

[0002] In a continuous production line, when the leading end stops at the exit section and the operator performs auxiliary operations such as pulling the head and unloading the coil, at this time, the strip in the middle section still runs at the speed of the process section and starts to fill the exit loop to ensure the continuous operation of the strip in the process section. When the operator completes the above auxiliary operations, the operator sets a speed greater than the speed of the middle section as the exit section speed according to his own experience, and performs loop release on the exit loop until the loop storage is 0.

[0003] The normal oiling machine is located in the exit section, that is, behind the exit tension roll group. On the one hand, there is a certain relationship between the oiling of the oiling machine and the speed of the exit section. On the other hand, considering that there is a certain time difference between the setting and reaction of the oiling machine (acceleration and deceleration mean that the actual oiling will have lag and fluctuations), the setting by the operator is limited by personal experience and cannot be solidified, resulting in the uniformity of the entire coil of strip not being guaranteed. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for improving the uniformity of oil coating on the surface of a strip. This method is applicable to a production line with an oil coating device provided in the exit section, and the speed of the exit section set by this method helps to improve the uniformity of oil coating on the surface of the strip.

[0005] The technical solution of the present invention lies in: a method for improving the uniformity of oil coating on the surface of a strip, including a device for improving the uniformity of oil coating on the surface of the strip. The device includes an intermediate section connected to the process section and an exit section connected to the intermediate section. An exit loop is provided on the intermediate section, and an oiling machine and a coiler are arranged on the exit section along the conveying direction. The steps are as follows:

[0006] Assume that the number of meters of the strip to be coiled is L, unit m;

[0007] (1) When the exit section just stops:

[0008] The speed of the intermediate section is V1, m / min; the speed of the exit section is 0, m / min; the loop amount of the exit loop is 0, m;

[0009] (2) When the head of the strip is coiled at the exit section:

[0010] The speed of the intermediate section is V1, m / min; the speed of the exit section is V2, m / min; the loop amount of the exit loop is L1, m; the number of meters coiled at the head of the coiler is L2, m;

[0011] (3) Derive the above

[0012] It is necessary to deduce that when a speed V2 greater than the speed V1 of the process section is set in the exit section, by using the speed difference between the exit section and the intermediate section, when the coiling length of L is just completed, the entire exit loop is emptied;

[0013] The speed difference between the exit section and the intermediate section is: V0 = V2 - V1;

[0014] The running time for the strip to utilize the speed difference until the loop is emptied: T1 = L1 / V0 = L1 / (V2 - V1);

[0015] The remaining coiling length required by the coiler is: L0 = L - L2;

[0016] The time required for the coiler to coil to the length L: T2 = L0 / V2 = (L - L2) / V2;

[0017] It is not difficult to deduce that:

[0018] When T1 = T2, at this time, it is exactly when the coiler at the exit coils to the length L, and the loop is just emptied, and this is the optimal solution at this time;

[0019] When T1 > T2, at this time, when the coiler at the exit coils to the length L, the loop has not been emptied yet. At this time, the speed of the exit section will be reduced and stopped. It can be used but is not the optimal solution;

[0020] When T1 < T2, at this time, the loop has been emptied, but the coiled length of the coiler at the exit has not reached L yet. In order to coil to the specified length, the speed of the exit section will be reduced to maintain the speed of the process section. As a result, in addition to the normal acceleration and deceleration sections at the head and tail of a coil of strip, there is also a deceleration section in the middle section, which affects the uniformity of oiling. This situation is not applicable;

[0021] (4) It can be deduced from this that

[0022] When T1 ≥ T2 is satisfied, that is, L1 / (V2 - V1) ≥ (L - L2) / V2, the entire coil of strip can maintain a speed so that the entire coil of strip can be in the uniform speed section for as long as possible;

[0023] It is deduced that V2 ≥ V1(L2 - L) / (L1 + L2 - L), and it is necessary to satisfy L2 - L < 0 and L1 + L2 - L < 0;

[0024] Among them, L2 - L < 0 means that the normal coiling length must be greater than the coiled length of the coiler;

[0025] L1 + L2 - L < 0 means that the normal coiling length should be greater than the sum of the coiled length of the coiler and the loop amount of the exit loop when the head of the strip is coiled at the exit section.

[0026] Further, the outlet loop includes a hoist motor, a wire rope, a loop trolley, a roller trolley, and a fixed roller turning roll.

[0027] Further, the oiling machine has upper and lower knife beams controlled separately by a metering pump.

[0028] Further, a tension roller is provided between the oiling machine and the intermediate section, and a turning roll is provided between the oiling machine and the coiler.

[0029] Compared with the prior art, the present invention has the following advantages: Based on the study of many factors such as the actual coiling length and the actual loop amount, a method of "setting a speed greater than the speed of the intermediate section as the speed of the outlet section" is proposed to ensure the uniformity of the entire coil of the strip. This method is applicable to production lines with oiling equipment in the outlet section, which is convenient for improving the uniformity of oiling on the strip surface, and enables the entire coil of the strip to be in a constant-speed section as long as possible (excluding the acceleration section and the deceleration section at the head and tail). Description of the Drawings

[0030] Figure 1 It is a schematic diagram of the device for improving the uniformity of oiling on the strip surface of the present invention. Detailed Embodiment

[0031] To make the above features and advantages of the present invention more understandable, specific embodiments are given below in conjunction with the drawings and described in detail as follows, but the present invention is not limited thereto.

[0032] Reference Figure 1

[0033] A method for improving the uniformity of oiling on the strip surface includes a device for improving the uniformity of oiling on the strip surface. The device includes an intermediate section connected to the process section and an outlet section connected to the intermediate section. An outlet loop is provided on the intermediate section, and the outlet loop includes a hoist motor, a wire rope, a loop trolley, a roller trolley, a fixed roller turning roll, etc. On the outlet section, a tension roller, an oiling machine, a turning roll, and a coiler are arranged in sequence along the conveying direction. The tension roller includes a No. 1 tension roller and a No. 2 tension roller, which are used to control and maintain the speed of the strip in the outlet section. The oiling machine has upper and lower knife beams controlled separately by a metering pump, and can use an electrostatic generating device to generate high voltage and spray the oil into a mist and attach it to the strip surface. The specific steps are as follows:

[0034] Assume that the length of the strip to be coiled is L, in m;

[0035] (1) When the outlet section just stops:

[0036] The speed of the intermediate section is V1, in m / min; the speed of the outlet section is 0, in m / min; the loop amount of the outlet loop is 0, in m.

[0037] (2)When the head coiling of the exit section is completed:

[0038] The speed of the middle section is V1, m / min; the speed of the exit section is V2, m / min; the loop amount of the exit loop is L1, m; the coiled meterage at the head of the coiler is L2, m.

[0039] (3)Derivation of the above

[0040] What needs to be derived is that when the exit section is set with a speed V2 greater than the speed V1 of the process section, by using the speed difference between the exit section and the middle section, when the coiled meterage of L is just completed, the entire exit loop is emptied;

[0041] The speed difference between the exit section and the middle section is: V0 = V2 - V1;

[0042] The running time for the strip to empty the loop using the speed difference: T1 = L1 / V0 = L1 / (V2 - V1);

[0043] The remaining meterage that the coiler still needs to coil is: L0 = L - L2;

[0044] The time required for the coiler to coil to the meterage L: T2 = L0 / V2 = (L - L2) / V2.

[0045] It is not difficult to deduce that:

[0046] When T1 = T2, it is exactly when the coiler at the exit coils to the meterage L and the loop is just emptied, and this is the optimal solution at this time;

[0047] When T1 > T2, when the coiler at the exit coils to the meterage L, the loop has not been emptied yet (too much remaining amount in the loop will affect the exit auxiliary time), and at this time the exit section will decelerate and stop, which can be used but is not the optimal solution;

[0048] When T1 < T2, at this time the loop has been emptied, but the coiled meterage of the coiler at the exit has not reached L yet. In order for the exit section to coil to the specified length, it will decelerate and run at the speed of the process section, resulting in a deceleration section in the middle section of a coil of strip in addition to the normal acceleration and deceleration sections at the head and tail, which affects the oiling uniformity, and this situation is not available.

[0049] (4)From this, it can be deduced that

[0050] When T1 ≥ T2 is satisfied, that is, L1 / (V2 - V1) ≥ (L - L2) / V2, it can keep the entire coil of strip at a speed and make the entire coil of strip stay in the constant speed section as long as possible;

[0051] It is deduced that V2≥V1(L2-L) / (L1+L2-L), and it is necessary to satisfy L2-L<0 and L1+L2-L<0;

[0052] Among them, L2-L<0 means that the number of meters that need to be coiled normally must be greater than the number of meters that the coiler has already coiled; otherwise, there is no need to continue the execution;

[0053] L1+L2-L<0 means that the number of meters that need to be coiled normally should be greater than the sum of the number of meters that the coiler has already coiled and the loop amount of the exit loop when the head of the exit section is coiled.

[0054] The value of V2 is affected by four parameters: (1) the speed V1 of the middle section; (2) the number of meters of the strip to be coiled L; (3) the loop amount L1 of the exit loop when the head of the exit section is coiled; (4) the number of meters L2 coiled by the coiling head when the head of the exit section is coiled.

[0055] Specifically, the device for improving the uniformity of strip surface coating oil further includes a PLC and a transmission device. The transmission device is used to control the rotation and movement of equipment such as trolleys, coilers, and hoists. The coiler is driven by a transmission motor and can wind the strip from a strip shape into a coil shape. The exit loop operates based on the speed of the middle section and is used to store the strip to ensure continuous production of the equipment. Among them, the hoist is used to control the forward and backward movement of the loop trolley. The steel wire rope is used as the medium connecting the hoist. The loop trolley can move forward and backward by being pulled by the steel wire rope, and the idler trolley can move forward and backward by being driven and controlled by a motor. The steering roller and the fixed idler roller are used to change the running direction of the strip.

[0056] Example verification one

[0057] (1) The speed V1 of the middle section = 30 m / min; (2) The number of meters of the strip to be coiled L = 500 m; (3) The loop amount L1 of the exit loop when the head of the exit section is coiled = 150 m; (4) The number of meters L2 coiled by the coiling head when the head of the exit section is coiled = 30 m.

[0058] According to the above derivation process, it is as follows:

[0059] (1) When the exit section just stops

[0060] The speed of the middle section is V1 = 30, m / min;

[0061] The speed of the exit section is 0, m / min;

[0062] The loop amount of the exit loop is 0, m.

[0063] (2) When the head of the exit section is coiled

[0064] The speed of the middle section is V1 = 30, m / min;

[0065] The speed of the outlet section is V2, m / min;

[0066] The loop length of the outlet loop is L1 = 150, m;

[0067] The number of meters coiled at the coiling head is L2 = 30, m;

[0068] The formula is V2 ≥ V1(L2 - L) / (L1 + L2 - L). Substituting the values, we get:

[0069] V2 ≥ 30(30 - 500) / (150 + 30 - 500), that is, V2 ≥ 44.06.

[0070] Then when the set speed of the outlet section is 44.06 m / min, the entire coil of strip can be maintained at a speed so that the entire coil of strip is in the uniform speed section as long as possible, thereby improving the uniformity of oil coating on the strip surface.

[0071] Example Verification 2

[0072] (1) The speed of the middle section V1 = 45 m / min; (2) The number of meters of strip to be coiled L = 700 m; (3) The loop length of the outlet loop when the outlet section completes the head coiling is L1 = 100 m; (4) The number of meters coiled at the coiling head when the outlet section completes the head coiling is L2 = 15 m.

[0073] According to the above derivation process:

[0074] (I) When the outlet section just stops

[0075] The speed of the middle section is V1 = 45, m / min;

[0076] The speed of the outlet section is 0, m / min;

[0077] The loop length of the outlet loop is 0, m;

[0078] (II) When the outlet section completes the head coiling

[0079] The speed of the middle section is V1 = 45, m / min;

[0080] The speed of the outlet section is V2, m / min;

[0081] The loop length of the outlet loop is L1 = 100, m;

[0082] The number of meters coiled at the coiling head is L2 = 15, m;

[0083] The formula is V2 ≥ V1(L2 - L) / (L1 + L2 - L). Substituting the values, we get:

[0084] V2≥45(15 - 700) / (100 + 15 - 700), that is, V2≥52.69.

[0085] Then when the set speed of the exit section is 52.69 m / min, the whole coil of strip can be maintained at a speed so that the whole coil of strip is in the constant speed section as long as possible, thereby improving the uniformity of oil coating on the strip surface.

[0086] Example Verification Three

[0087] (1) The speed of the middle section V1 = 60 m / min; (2) The length of the strip to be coiled L = 1000 m; (3) The loop amount of the exit loop when the head coiling of the exit section is completed L1 = 300 m; (4) The coiled length of the coiling head when the head coiling of the exit section is completed is L2 = 35 m.

[0088] According to the above derivation process as follows:

[0089] (I) When the exit section just stops

[0090] The speed of the middle section is V1 = 60 m / min;

[0091] The speed of the exit section is 0 m / min;

[0092] The loop amount of the exit loop is 0 m.

[0093] (II) When the head coiling of the exit section is completed

[0094] The speed of the middle section is V1 = 60 m / min;

[0095] The speed of the exit section is V2 m / min;

[0096] The loop amount of the exit loop is L1 = 300 m;

[0097] The coiled length of the coiling head is L2 = 35 m;

[0098] Substitute the values into the formula V2≥V1(L2 - L) / (L1 + L2 - L):

[0099] V2≥60(35 - 1000) / (300 + 35 - 1000), that is, V2≥87.07.

[0100] Then when the set speed of the exit section is 87.07 m / min, the whole coil of strip can be maintained at a speed so that the whole coil of strip is in the constant speed section as long as possible, thereby improving the uniformity of oil coating on the strip surface.

[0101] Therefore, for the actual coiling length, actual loop amount, etc., a speed greater than the speed of the middle section can be set as the exit section speed to ensure the uniformity of the whole coil of strip.

[0102] The above are only the preferred embodiments of the present invention. For those of ordinary skill in the art, according to the teachings of the present invention, designing different forms of methods for improving the uniformity of oil coating on the strip surface does not require creative labor. Without departing from the principles and spirit of the present invention, all equal changes, modifications, substitutions, and variations made within the scope of the patent application of the present invention shall fall within the scope of the present invention.

Claims

1. A method for improving the uniformity of oil coating on the strip surface, including a device for improving the uniformity of oil coating on the strip surface. The device includes an intermediate section connected to the process section and an outlet section connected to the intermediate section. An outlet loop is provided on the intermediate section, and an oil coater and a coiler are arranged on the outlet section along the conveying direction. It is characterized in that the steps are as follows: The number of meters of the strip to be coiled is L, in m; (1) When the outlet section just stops: The speed of the intermediate section is V1, in m / min; the speed of the outlet section is 0, in m / min; the loop amount of the outlet loop is 0, in m; (2) When the head coiling of the outlet section is completed: The speed of the intermediate section is V1, in m / min; the speed of the outlet section is V2, in m / min; the loop amount of the outlet loop is L1, in m; the number of meters coiled at the head of the coiler is L2, in m; (3) Deduction What needs to be deduced is that when a speed V2 greater than the process section speed V1 is set for the outlet section, using the speed difference between the outlet section and the intermediate section, when the coiling of L meters is just completed, the entire outlet loop is emptied; The speed difference between the outlet section and the intermediate section is: V0 = V2 - V1; The running time for the strip to empty the loop using the speed difference is: T1 = L1 / V0 = L1 / (V2 - V1); The number of meters that the coiler still needs to coil is: L0 = L - L2; The time required for the coiler to coil to the number of meters L is: T2 = L0 / V2 = (L - L2) / V2; It is not difficult to deduce that when T1 = T2, at this time, it is just when the outlet coiler coils to the number of meters L, and the loop is just emptied, and this is the optimal solution; when T1 > T2, at this time, when the outlet coiler coils to the number of meters L, the loop has not been emptied yet, and at this time, the outlet section will decelerate and stop, which can be used but is not the optimal solution; when T1 < T2, at this time, the loop has been emptied, but the number of meters coiled by the outlet coiler has not reached L. In order for the outlet section to coil to the specified length, it will decelerate and run at the process section speed, resulting in a deceleration section in the middle section of a coil of strip in addition to the normal acceleration and deceleration sections at the head and tail, which has an impact on the oil coating uniformity, and this situation cannot be used; (4) From this, it can be deduced that when T1 ≥ T2, that is, L1 / (V2 - V1) ≥ (L - L2) / V2, the entire coil of strip is kept at a speed so that the entire coil of strip is in the uniform speed section as long as possible; It is deduced that V2 ≥ V1(L2 - L) / (L1 + L2 - L), and it is necessary to satisfy L2 - L < 0 and L1 + L2 - L < 0; Among them, L2 - L < 0 means that the normal number of meters to be coiled must be greater than the number of meters already coiled by the coiler; L1 + L2 - L < 0 means that the normal number of meters to be coiled should be greater than the sum of the number of meters already coiled by the coiler and the loop amount of the outlet loop when the head coiling of the outlet section is completed.

2. A method for improving the uniformity of oil coating on the strip surface according to claim 1, It is characterized in that the outlet loop includes a hoist motor, a steel wire rope, a loop trolley, a roller trolley and a fixed roller turning roll.

3. A method for improving the uniformity of oil coating on the strip surface according to claim 1 or 2, characterized in that, the oiling machine has upper and lower knife beams independently controlled by metering pumps.

4. A method for improving the uniformity of oil coating on the strip surface according to claim 1, characterized in that, a tension roller is further provided between the oiling machine and the intermediate section, and a turning roller is provided between the oiling machine and the coiler.

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