Method for controlling elongation of air cushion furnace straightening machine

Abstract

The invention discloses an elongation control method of an air cushion furnace straightening machine and belongs to the technical field of alloy production. In order to solve the problem that the actual value of the elongation cannot meet the process requirement due to motor torque amplitude limiting when the elongation of the existing straightening machine is controlled at a low speed, the method comprises the following steps: calculating the inlet speed and the outlet speed of the straightening machine according to the feedback rotating speed of a tension roller group motor; according to the inlet speed and the outlet speed of the straightener, the inlet and outlet speed difference of the straightener is obtained; according to the inlet and outlet speed difference of the straightener, the actual elongation value of the straightener is obtained; and according to the actual elongation value, the inlet speed and the outlet speed of the straightening machine are adjusted, torque output of the motor is adjusted, and a control closed loop is formed. The invention is used for the air cushion furnace.

Description

Technical Field

[0001] The invention relates to an elongation control method of an air cushion furnace straightening machine, belonging to the technical field of alloy production. Background Art

[0002] The air cushion furnace is a key production equipment for alloy production. The main problems in the elongation control of the straightener of this equipment are:

[0003] Affected by the thickness of different alloy strips and process requirements, the machine speed range of the air cushion furnace is 3m / min-50m / min, the elongation of the straightener is required to be in the range of 1.8-3.0, and the elongation control of the straightener was originally controlled by indirect torque control. Since the motor torque is limited during low-speed operation, the control accuracy is low and the control difficulty is great. The actual elongation value of the straightener does not meet the process requirements and the straightening effect is not good. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the motor torque is limited when the elongation control of the existing straightener is running at low speed, resulting in the actual elongation value failing to meet the process requirements, and an elongation control method for an air cushion furnace straightener is provided.

[0005] The elongation control method of an air cushion furnace straightening machine described in the present invention comprises:

[0006] S1, calculating the inlet speed and outlet speed of the straightening machine according to the feedback speed of the tension roller group motor;

[0007] S2. Obtain the inlet and outlet speed difference of the straightener according to the inlet speed and outlet speed of the straightener;

[0008] S3, obtaining the actual value of the elongation of the straightening machine according to the speed difference between the inlet and outlet of the straightening machine;

[0009] S4. According to the actual value of elongation, adjust the inlet speed and outlet speed of the straightening machine, adjust the torque output of the motor, and form a control closed loop.

[0010] Preferably, the specific method of calculating the inlet speed and outlet speed of the straightening machine according to the feedback transmission speed of the tension roller group motor in S1 includes:

[0011] Straightening machine inlet speed s in for:

[0012]

[0013] Among them, V 54 Indicates the feedback speed of the encoder of the No. 4 roller of the No. 5 tension roller group, d 54 Indicates the roller diameter of the No. 4 roller of the No. 5 tension roller group;

[0014] Straightening machine inlet speed s out for:

[0015]

[0016] Among them, V 61 Indicates the feedback speed of the encoder of the No. 1 roller of the No. 6 tension roller group, d 61 Indicates the roller diameter of the No. 1 roller of the No. 6 tension roller group.

[0017] Preferably, the specific method of obtaining the inlet and outlet speed difference of the straightener according to the inlet speed and outlet speed of the straightener in S2 includes:

[0018] The speed difference S of the straightening machine at the inlet and outlet is:

[0019] S=s in -s out .

[0020] Preferably, the specific method of obtaining the actual value of the elongation of the straightener according to the inlet and outlet speed difference of the straightener in S3 includes:

[0021] The actual value of the elongation σ of the straightening machine is:

[0022] σ=S×100%.

[0023] Advantages of the present invention: The elongation control method of the air cushion furnace straightening machine proposed in the present invention changes the original elongation control calculation method of the straightening machine, and no longer sets the motor torque limit, so as to achieve the function of controlling the elongation of the straightening machine at a low speed (the air cushion furnace machine speed is less than 5m / min) to achieve the control accuracy reaching the standard, greatly improve the straightening effect and process requirements of the straightening machine, improve the production efficiency and the yield rate, and achieve a double guarantee for the product and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a flow chart of the elongation control method of the air cushion furnace straightening machine of the present invention. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0028] Embodiment 1:

[0029] Combine the following Figure 1 The present embodiment is described. The present embodiment describes an elongation control method of an air cushion furnace straightening machine, which comprises:

[0030] S1, calculating the inlet speed and outlet speed of the straightening machine according to the feedback speed of the tension roller group motor;

[0031] S2. Obtain the inlet and outlet speed difference of the straightener according to the inlet speed and outlet speed of the straightener;

[0032] S3, obtaining the actual value of the elongation of the straightening machine according to the speed difference between the inlet and outlet of the straightening machine;

[0033] S4. According to the actual value of elongation, adjust the inlet speed and outlet speed of the straightening machine, adjust the torque output of the motor, and form a control closed loop.

[0034] Furthermore, the specific method of calculating the inlet speed and outlet speed of the straightening machine according to the feedback transmission speed of the tension roller group motor in S1 includes:

[0035] Straightening machine inlet speed s in for:

[0036]

[0037] Among them, V 54 Indicates the feedback speed of the encoder of the No. 4 roller of the No. 5 tension roller group, d 54 Indicates the roller diameter of the No. 4 roller of the No. 5 tension roller group;

[0038] Straightening machine inlet speed s out for:

[0039]

[0040] Among them, V 61 Indicates the feedback speed of the encoder of the No. 1 roller of the No. 6 tension roller group, d 61 Indicates the roller diameter of the No. 1 roller of the No. 6 tension roller group.

[0041] Furthermore, the specific method of obtaining the inlet and outlet speed difference of the straightener according to the inlet speed and outlet speed of the straightener in S2 includes:

[0042] The speed difference S of the straightening machine at the inlet and outlet is:

[0043] S=s in -s out .

[0044] Furthermore, the specific method of obtaining the actual value of the elongation of the straightener according to the speed difference between the inlet and outlet of the straightener in S3 includes:

[0045] The actual value of the elongation σ of the straightening machine is:

[0046] σ=S×100%.

[0047] In the present invention, in order to improve the control ability and straightening effect of the elongation of the air cushion furnace straightener on the basis of the original equipment, and reduce the situation where the motor torque is limited and the elongation of the straightener is uncontrollable when the equipment is running at a low speed. The main steps are as follows:

[0048] The straightening machine elongation speed control method program involved in the program:

[0049] The motor torque limit in the original indirect torque control of the straightening machine elongation in the program was cancelled, and the program for the speed control of the straightening machine elongation was rewritten in the program. The original fixed output of the motor torque was changed to free control of the motor torque according to the speed, so as to achieve precise control of the elongation of the straightening machine and meet the tension requirements of the equipment.

[0050] Mainly include:

[0051] (1) Cancel the motor torque limit in the program;

[0052] (2) The speed feedback in the motor transmission of the tension roller group is calculated in the program to calculate the inlet speed and outlet speed of the straightener. The inlet linear speed of the straightener is the speed feedback of the encoder of roller No. 4 of the tension roller group No. 5 ÷ the roller diameter of roller No. 4 of the tension roller group No. 5. The outlet linear speed of the straightener is the speed feedback of the encoder of roller No. 1 of the tension roller group No. 6 ÷ the roller diameter of roller No. 1 of the tension roller group No. 6;

[0053] (3) In the program, the speed difference between the inlet and outlet is calculated based on the inlet speed and outlet speed of the straightener. The speed difference between the inlet and outlet of the straightener is the linear speed value of roller No. 1 of the No. 6 tension roller group minus the linear speed value of roller No. 4 of the No. 5 tension roller group. The actual elongation of the straightener is calculated through the formula actual elongation value = (straightener outlet speed - straightener inlet speed) * 100%. The inlet and outlet speeds of the straightener are continuously adjusted according to the feedback value, and the motor torque output is adjusted at the same time to form a control closed loop, so as to achieve precise control of the elongation speed of the straightener.

[0054] The present invention mainly solves the problem that when the air cushion furnace train speed is less than 5m / min, the straightener elongation adopts indirect torque control, and the elongation control is inaccurate and unstable. The main contents of the present invention are: 1. Adding a straightener elongation speed control calculation program in the PLC; 2. The calculated value is passed into the transmission program, and the transmission program executes the speed calculation of the tension roller motor; The characteristics of the present invention: This invention changes the straightener elongation control from the original torque control to speed control. After the change, the elongation control is more precise. When the machine train runs at a low speed, the elongation control is still accurate, controllable, and has high control accuracy. Greatly improve the straightening effect and yield rate of the straightener.

[0055] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. A method for controlling the elongation of an air cushion furnace straightening machine, characterized in that: It includes: S1, calculating the inlet speed and outlet speed of the straightening machine according to the feedback speed of the tension roller group motor; S2. Obtain the inlet and outlet speed difference of the straightener according to the inlet speed and outlet speed of the straightener; S3, obtaining the actual value of the elongation of the straightening machine according to the speed difference between the inlet and outlet of the straightening machine; S4. According to the actual value of elongation, adjust the inlet speed and outlet speed of the straightening machine, adjust the torque output of the motor, and form a control closed loop.

2. The elongation control method of an air cushion furnace straightening machine according to claim 1, characterized in that: The specific method of calculating the inlet speed and outlet speed of the straightening machine according to the feedback transmission speed of the tension roller group motor described in S1 includes: Straightening machine inlet speed s in for: Among them, V 54 Indicates the feedback speed of the encoder of the No. 4 roller of the No. 5 tension roller group, d 54 Indicates the roller diameter of the No. 4 roller of the No. 5 tension roller group; Straightening machine inlet speed s out for: Among them, V 61 Indicates the feedback speed of the encoder of the No. 1 roller of the No. 6 tension roller group, d 61 Indicates the roller diameter of the No. 1 roller of the No. 6 tension roller group.

3. The elongation control method of an air cushion furnace straightening machine according to claim 2, characterized in that: The specific method of obtaining the inlet and outlet speed difference of the straightening machine according to the inlet speed and outlet speed of the straightening machine in S2 includes: The speed difference S of the straightening machine at the inlet and outlet is: S=s in -s out 。 4. The elongation control method of an air cushion furnace straightening machine according to claim 3, characterized in that: The specific method of obtaining the actual value of the elongation of the straightening machine according to the speed difference between the inlet and outlet of the straightening machine in S3 includes: The actual value of the elongation σ of the straightening machine is: σ=S×100%.

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