Forward slip fault alarm device for cold continuous rolling unit

Abstract

The utility model provides a forward slip fault alarm device for a cold continuous rolling unit, which comprises a laser speed measurement sensor used for detecting the speed of strip steel at an outlet of a rack of the cold continuous rolling unit; and the cold continuous rolling unit upper computer is in communication connection with the laser speed measurement sensor and the buzzer, and when the ratio of the difference between the roller linear speed of the cold continuous rolling unit and the strip steel speed to the roller linear speed is not in a preset range, the buzzer is controlled to give a forward slip fault alarm. According to the utility model, the speed of the strip steel at the outlet of the rack of the cold continuous rolling unit is detected by using the laser speed measurement sensor, and the roller linear speed of the cold continuous rolling unit is compared with the speed of the strip steel, so that whether the cold continuous rolling unit has a forward slip fault can be judged, and workers are reminded to process.

Description

Technical Field

[0001] The utility model relates to the technical field of cold tandem mill unit optimization, in particular to a front slip fault alarm device for a cold tandem mill unit. Background Technique

[0002] The cold tandem mill unit is a key device for the high-speed production of cold-rolled strip. Its production continuity and production stability directly determine the production capacity and output of the device, and more directly affect the output value of the cold rolling mill. During the production process of hard cold-rolled base plates, affected by multiple factors such as the metal flow state, strip surface quality, roll state, and emulsion state, the phenomenon of negative front slip is likely to occur. In the light case, it affects the surface quality and output of the strip steel, such as causing scratch marks; in the heavy case, it causes strip breakage and steel piling accidents, seriously affecting production. Content of the Utility Model

[0003] To solve the above problems, the purpose of the utility model is to provide a front slip fault alarm device for a cold tandem mill unit.

[0004] To achieve the above purpose, the utility model provides the following scheme:

[0005] A front slip fault alarm device for a cold tandem mill unit, comprising:

[0006] A laser speed sensor, used to detect the strip steel speed at the outlet of the cold tandem mill unit stand;

[0007] The upper computer of the cold tandem mill unit is respectively communicatively connected with the laser speed sensor and the buzzer. When the ratio of the difference between the roll linear speed and the strip steel speed of the cold tandem mill unit is not within the preset range, it controls the buzzer to emit a front slip fault alarm.

[0008] Preferably, the laser speed sensor comprises:

[0009] A laser emitter, used to emit a laser beam to the strip steel;

[0010] A receiver, used to receive the signal reflected by the laser beam;

[0011] A signal processor is respectively communicatively connected with the laser emitter and the receiver, and is used to determine the strip steel speed according to the signal reflected by the laser beam.

[0012] Preferably, the laser emitter comprises:

[0013] An operational amplifier U1. The inverting input terminal of the operational amplifier U1 is respectively connected to one end of a first resistor R1 and a seventh resistor R7. The non-inverting input terminal of the operational amplifier U1 is respectively connected to one end of a second resistor R2 and a third resistor R3. The other end of the second resistor R2 is used to receive the excitation voltage;

[0014] Transistor Q1, the base of the transistor Q1 is connected to the output terminal of the operational amplifier U1, the emitter of the transistor Q1 is also connected to the other end of the seventh resistor R7, the emitter of the transistor Q1 is also connected to one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected to the anode of the laser emitting diode D2 through the fifth resistor R5, and the cathode of the laser emitting diode D2 is grounded.

[0015] Preferably, it further includes:

[0016] A laser intensity modulation unit S1, one end of the laser intensity modulation unit S1 is respectively connected to the collector of the transistor Q1 and the anode of the first diode D1, and the other end of the laser intensity modulation unit S1 is respectively connected to one end of the sixth resistor R6 and the cathode of the first diode D1; the other end of the sixth resistor R6 is used to connect to the power supply.

[0017] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0018] The present invention provides a front-slip fault alarm device for a cold tandem rolling mill. Compared with the prior art, the present invention can detect the strip speed at the outlet of the cold tandem rolling mill stand by using a laser speed sensor, and compare the roll line speed of the cold tandem rolling mill with the strip speed, so as to determine whether there is a front-slip fault in the cold tandem rolling mill, thereby reminding the staff to deal with it. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a schematic diagram of a front-slip fault alarm device for a cold tandem rolling mill provided by the present invention;

[0021] Figure 2 It is a circuit diagram of a laser emitter provided by the present invention. Detailed Embodiments

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer and more understandable, the present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0024] To achieve the above object, the technical solution adopted by the present utility model is:

[0025] Please refer to Figure 1 , a front-slip fault alarm device for a tandem cold rolling mill unit, comprising:

[0026] A laser speed sensor for detecting the strip speed at the outlet of the tandem cold rolling mill unit stand;

[0027] The upper computer of the tandem cold rolling mill unit is communicatively connected to the laser speed sensor and the buzzer respectively. When the ratio of the difference between the roll linear speed and the strip speed of the tandem cold rolling mill unit is not within the preset range, the buzzer is controlled to issue a front-slip fault alarm.

[0028] Further, the laser speed sensor includes:

[0029] A laser emitter for emitting a laser beam to the strip;

[0030] A receiver for receiving the signal reflected by the laser beam;

[0031] A signal processor is communicatively connected to the laser emitter and the receiver respectively, and is used to determine the strip speed according to the signal reflected by the laser beam.

[0032] Please refer to Figure 2 , the laser emitter includes:

[0033] An operational amplifier U1, the inverting input terminal of the operational amplifier U1 is connected to one end of a first resistor R1 and a seventh resistor R7 respectively, the non-inverting input terminal of the operational amplifier U1 is connected to one end of a second resistor R2 and a third resistor R3 respectively, and the other end of the second resistor R2 is used to receive an excitation voltage;

[0034] A triode Q1, the base of the triode Q1 is connected to the output terminal of the operational amplifier U1, the emitter of the triode Q1 is also connected to the other end of the seventh resistor R7, the emitter of the triode Q1 is also connected to one end of a fourth resistor R4, the other end of the fourth resistor R4 is connected to the anode of a laser emitting tube D2 through a fifth resistor R5, and the cathode of the laser emitting tube D2 is grounded.

[0035] A laser intensity modulation unit S1, one end of the laser intensity modulation unit S1 is respectively connected to the collector of the triode Q1 and the anode of the first diode D1, and the other end of the laser intensity modulation unit S1 is respectively connected to one end of the sixth resistor R6 and the cathode of the first diode D1; the other end of the sixth resistor R6 is used to connect to a power supply.

[0036] When the laser intensity modulation unit outputs a high level, it will cause S1 to close, and the power supply will energize the diode D1. On the contrary, if the laser intensity modulation unit outputs a low level, it will cause S1 to open, and the power supply will cut off the power to the diode D1. Therefore, in practical applications, as long as the pulse modulation unit is reasonably controlled to output high and low levels regularly, it will effectively control the conduction and cut-off of the diode D1, thus facilitating the realization of laser intensity modulation of the laser, thereby reducing the interference of the laser speed sensor.

[0037] In practical applications, the calculation formula for the ratio of the difference between the roll linear speed and the strip speed in a tandem cold rolling mill to the roll linear speed is:

[0038]

[0039] Among them, φ represents the neutral angle, h represents the strip thickness at the outlet of the stand, R′ represents the flattened radius, r represents the deformation rate, α represents the bite angle, μ represents the friction coefficient, H represents the thickness at the inlet of the stand, tb represents the post-unit tension, tf represents the pre-unit tension, kb represents the deformation resistance at the inlet of the stand, kf represents the deformation resistance at the outlet of the stand, k0, m, and n are the first, second, and third deformation resistance model parameters respectively, and f s represents the ratio of the difference between the strip speed at the outlet of the stand and the roll linear speed to the roll linear speed, v s represents the strip speed at the outlet of the stand, v R represents the roll linear speed, and R represents the radius of the work roll.

[0040] According to the above analysis, f sIt is related to parameters such as the strip thickness at the exit of the stand, the neutral angle, and the work roll radius. Therefore, the present utility model can adjust the operating parameters of the cold tandem rolling mill to make the ratio of the difference between the strip speed and the roll linear speed at the exit of the stand to the roll linear speed reach a set value. For example: 1. Increase the roll roughness of the stand work roll by 0.1 - 0.3 μm to increase the contact friction torque between the roll and the strip in the rolling deformation zone, thereby increasing the neutral angle in the rolling deformation zone and making the forward slip show an increasing trend; 2. Increase the front tension of the front stand by 2% - 5% and decrease the rear tension of the rear stand by 1% - 2% to increase the forward slip trend of the strip; 3. Reduce the load of the stand by 1% - 3% to make the rolling torque slightly less than the static friction torque, so as to avoid slipping during the actual rolling process and improve the rolling stability; 4. Replace the work roll when the rolling kilometerage reaches 50% - 60% of the currently set rolling kilometerage to ensure the roll roughness and reduce the probability of the work roll of the rolling mill slipping.

[0041] According to the specific embodiments provided by the present utility model, the following technical effects are disclosed by the present utility model:

[0042] The present utility model provides a forward slip fault alarm device for a cold tandem rolling mill. Compared with the prior art, by using a laser speed sensor to detect the strip speed at the exit of the stand of the cold tandem rolling mill and comparing the roll linear speed of the cold tandem rolling mill with the strip speed, it can be determined whether a forward slip fault occurs in the cold tandem rolling mill, thereby reminding the staff to handle it.

[0043] In this article, specific examples are used to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A cold rolling mill forward slip fault alarm device, characterized in that: include: Laser speed sensor, used to detect the strip speed at the exit of the cold rolling mill; The host computer of the cold rolling mill is respectively connected to the laser speed sensor and the buzzer for communication. When the difference between the roller linear speed and the strip speed of the cold rolling mill and the ratio of the roller linear speed are not within a preset range, the buzzer is controlled to issue a forward slip fault alarm.

2. A cold rolling mill forward slip fault alarm device as claimed in claim 1, characterized in that: The laser speed sensor comprises: A laser transmitter, used for transmitting a laser beam to the steel strip; A receiver, used to receive the signal reflected by the laser beam; The signal processor is respectively connected to the laser transmitter and the receiver for communication, and is used to determine the speed of the strip according to the signal reflected by the laser beam.

3. A cold rolling mill forward slip fault alarm device as claimed in claim 2, characterized in that: The laser transmitter comprises: An operational amplifier (U1), wherein the reverse input terminal of the operational amplifier (U1) is respectively connected to one end of the first resistor (R1) and the seventh resistor (R7), the same-direction input terminal of the operational amplifier (U1) is respectively connected to one end of the second resistor (R2) and the third resistor (R3), and the other end of the second resistor (R2) is used to receive an excitation voltage; A transistor (Q1), wherein the base of the transistor (Q1) is connected to the output end of the operational amplifier (U1), the emitter of the transistor (Q1) is also connected to the other end of the seventh resistor (R7), the emitter of the transistor (Q1) is also connected to one end of a fourth resistor (R4), the other end of the fourth resistor (R4) is connected to the anode of a laser emitting tube (D2) through a fifth resistor (R5), and the cathode of the laser emitting tube (D2) is grounded.

4. A cold rolling mill forward slip fault alarm device as claimed in claim 3, characterized in that: Also includes: A laser intensity modulation unit (S1), one end of the laser intensity modulation unit (S1) is respectively connected to the collector of the triode (Q1) and the anode of the first diode (D1), and the other end of the laser intensity modulation unit (S1) is respectively connected to one end of a sixth resistor (R6) and the cathode of the first diode (D1); the other end of the sixth resistor (R6) is used to connect to a power supply.

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