A method and device for increasing the service life of a coating machine rolling line roller

Abstract

The present invention relates to a method and device for improving the service life of the rolling line roller of a coating machine. An adjusting roller driven by a motor is arranged between the rolling line roller and the steering roller. When the galvanizing unit is shut down and restarted due to maintenance or equipment failure, the motor drives the adjusting roller, and the adjusting roller extends to drive the strip steel to separate from the rolling line roller, so that the rolling line roller is 15 to 20 mm away from the surface of the strip steel, and the chemical coating machine is in a non-input state and leaves the surface of the strip steel. When the galvanizing unit runs stably, the motor drives the adjusting roller, the adjusting roller retracts, and the rolling line roller resumes normal operation. The advantages are: a movable adjusting roller is added under the rolling line roller, and the adjusting roller is driven to move by a cylinder, so that the rolling line roller is away from the surface of the strip steel, thereby improving the service life of the rolling line roller, improving the roller replacement cycle of the rolling line roller, and reducing the roller replacement cost.

Description

Technical Field

[0001] The invention belongs to the field of hot-dip galvanizing production, and in particular relates to a method and a device for improving the service life of a coating machine rolling line roller. Background Art

[0002] After cold rolling, the strip steel passes through the zinc pot, skin straightening and coating machine in the hot-dip galvanizing unit continuously to obtain the products required by customers. Metal passivation refers to the phenomenon that the corrosion and dissolution rate (corrosion current) of metals suddenly decreases greatly under the action of macroscopic or microscopic anodic polarization. The surface passivation treatment of hot-dip galvanizing is to enhance the corrosion resistance of the zinc layer on the surface of the galvanized sheet.

[0003] The surface passivation treatment system after hot-dip galvanizing unit includes rolling line roller, material tray, lifting roller and coating roller, see Figure 1 , Figure 2 . Before coating, the strip is stabilized by a rolling line roller. Its function is to maintain the corresponding position of the strip when the coater is moved out of the production line for roll change and cleaning. The passivation liquid tray is made of stainless steel and installed under the feed roller to hold the passivation liquid. The depth of the feed roller immersed in the passivation liquid can be adjusted by the hydraulic cylinder of the tray. Each tray has two inlets and one outlet, which are connected by hoses to form a passivation liquid circulation system. The feed roller is made of stainless steel plated with hard chrome and has a diameter of 300mm. The roller rotates in the passivation liquid and brings the passivation liquid to the gap between the feed roller and the coating roller. The surface of the coating roller is polyurethane coated. The diameter of the unground coating roller is 350mm and is used to apply the passivation liquid to the surface of the strip.

[0004] When the galvanizing unit is started or stopped due to maintenance or equipment failure, the temperature in the zinc pot decreases and the strip does not run, resulting in a low temperature of the strip in the zinc pot when the unit is started. The entire unit is in a non-steady state, so the surface quality of the strip is particularly poor, with many zinc flow lines and zinc fluctuation defects, which cannot meet user requirements and are downgraded to scrap. However, in the process of running from the zinc pot to the coating machine, the zinc scale on the strip is cleaned by a scraper to prevent the tension roller (steel roller) from being covered with zinc scale. When the strip passes through the coating machine steering roller to the chemical coating machine, the rolling line roller (rubber roller) is a fixed roller and cannot be moved, resulting in the strip with poor surface quality damaging the roller surface. In order to ensure product quality, the rubber roller must be replaced every 3 months, which not only increases the spare parts consumption cost of the unit, but also increases the maintenance cost. Summary of the invention

[0005] The purpose of the present invention is to provide a method and device for increasing the cycle of the coating machine rolling line roller, adding a movable adjustment roller to make the rolling line roller leave the surface of the steel strip, thereby increasing the life of the rolling line roller, extending the rolling line roller replacement cycle, and reducing the roller replacement cost.

[0006] To achieve the above object, the present invention is implemented through the following technical solutions:

[0007] A method for increasing the service life of a coating machine rolling line roller, comprising the following contents:

[0008] 1) An adjustment roller driven by a motor is arranged between the rolling line roller and the steering roller;

[0009] 2) When the galvanizing unit is shut down for maintenance or equipment failure, the motor drives the adjusting roller, which extends to drive the strip to separate from the rolling line roller, so that the rolling line roller is 15 to 20 mm away from the strip surface, and the chemical coating machine is not in operation and leaves the strip surface;

[0010] 3) When the galvanizing unit runs stably, the motor drives the adjustment roller, the adjustment roller retracts, and the rolling line roller resumes normal operation.

[0011] The galvanizing unit is judged to be running stably: after the galvanizing unit is shut down and restarted, the surface of the steel strip is manually observed. If there is no zinc scale on the surface of the steel strip, the galvanizing unit is running stably.

[0012] A device for increasing the service life of a coating machine rolling line roller comprises an adjusting roller, a motor, a lead screw, a nut and a sleeve, wherein the output shaft of the motor is fixedly connected to the lead screw, the lead screw is threadedly connected to the nut, the nut is fixedly connected to the sleeve, the sleeve is connected to the adjusting roller, and the adjusting roller moves back and forth in a straight line under the drive of the motor; in a working state, the motor drives the adjusting roller to a working position, the adjusting roller pushes the strip steel above the steering roller to make the strip steel detach from the rolling line roller; in a non-working state, the motor drives the adjusting roller to return to an initial position, and the adjusting roller detaches from the strip steel above the steering roller.

[0013] The adjusting roller is a steel roller.

[0014] The diameter of the adjusting roller is 200-300 mm.

[0015] The motor is fixed on a fixed support of the rolling line roller.

[0016] It also includes a bracket, two ends of the adjustment roller are connected to the bracket, and the middle of the bracket is fixedly connected to the sleeve.

[0017] The utility model also comprises a track and a small wheel. The track is fixedly connected to a fixed support of the rolling line roller, and the small wheel is connected to the bottom of the casing, and the small wheel can move on the track.

[0018] The motor is a three-phase asynchronous motor.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The method and device for increasing the roller cycle of the coating machine rolling line can increase the service life of the rolling line roller and extend the roller replacement cycle of the rolling line roller.

[0021] 2. Add a movable adjustment roller under the rolling line roller, drive the adjustment roller to move through the motor, so that the rolling line roller leaves the surface of the strip, thereby increasing the life of the rolling line roller, increasing the rolling line roller replacement cycle, and reducing the roller replacement cost.

[0022] 3. The adjustment rollers are steel rollers, and old rollers can be used during actual installation to reduce cost investment. When the galvanizing unit is restarted, the strip steel can be pushed to separate from the rolling line rollers to avoid scratches on the rolling line roller surface, reduce the number of roller replacements, and reduce the maintenance downtime and labor maintenance costs caused by roller replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the main view of the original surface passivation treatment system.

[0024] Figure 2 It is a side view of the original surface passivation treatment system.

[0025] Figure 3 The structure of the present invention is schematically shown in FIG. Figure 1 .

[0026] Figure 4 The structure of the present invention is schematically shown in FIG. Figure 2 .

[0027] Figure 5 It is a connection diagram between the motor and the adjustment roller.

[0028] Figure 6 yes Figure 5 Top view of the .

[0029] Figure 7 This is the electrical schematic of the motor.

[0030] In the figure: 1- rolling line roller, 2- material tray, 3- lifting roller, 4- coating roller, 5- drying equipment, 6- strip steel, 7- steering roller, 8- adjusting roller, 9- motor, 10- lead screw, 11- nut, 12- casing, 13- bracket, 14- track, 15- small wheel. DETAILED DESCRIPTION

[0031] The present invention is described in detail below in conjunction with the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0032] See Figure 3-Figure 6, a device for improving the service life of the rolling line roller of the coating machine, comprising an adjusting roller 8, a motor 9, a lead screw 10, a nut 11, and a sleeve 12, wherein the output shaft of the motor 9 is fixedly connected to the lead screw 10, the lead screw 10 is threadedly connected to the nut 11, the nut 11 is fixedly connected to the sleeve 12, the sleeve 12 is connected to the adjusting roller 8, and the adjusting roller 8 moves back and forth linearly under the drive of the motor 9; the adjusting roller 8 is arranged below the rolling line roller 1 and above the steering roller 7. When the galvanizing unit is restarted, the adjusting roller 8 is put into use, and in the working state, the motor 9 drives the lead screw 10 to rotate, and then drives the adjusting roller 8 to the working position through the nut 11, and the adjusting roller 8 pushes the strip steel 6 above the steering roller 7 to make the strip steel 6 separate from the rolling line roller 1; in the non-working state, the motor 9 drives the adjusting roller 8 back to the initial position, and the adjusting roller 8 separates from the strip steel 6 above the steering roller 7.

[0033] The adjustment roller 8 is a steel roller. The diameter of the adjustment roller 8 is designed to be 200-300 mm according to the coating machine space. In actual application, an old steel roller can be used.

[0034] The device for improving the service life of the coating machine rolling line roller also includes a bracket 13, and the two ends of the adjustment roller 8 are connected to the bracket 13, and the middle of the bracket 13 is fixedly connected to the sleeve 12, so that the motor 9 can drive the adjustment roller 8 to completely fit the strip steel 6 without deflection. In addition, a small wheel 15 can be installed at the bottom of the sleeve 12, and a track 14 can be installed on the fixed support of the rolling line roller 1. The small wheel 15 can move on the track 14 to support the adjustment roller 8, ensure that the adjustment roller 8 moves smoothly, and can stably push the strip steel 6.

[0035] The motor 9 is fixed on the fixed support of the rolling line roller 1. The motor 9 adopts a three-phase asynchronous motor with forward and reverse rotation functions. Figure 7 , the main circuit uses two contactors, namely the forward contactor KM1 and the reverse contactor KM2. When the contactor KM1 is turned on, the phase sequence of the three-phase power supply is U-V-W connected to the motor 9, and the motor 9 rotates in the forward direction. When the contactor KM1 is disconnected and the contactor KM2 is turned on, the phase sequence of the three-phase power supply is W-V-U connected to the motor 9, and the motor 9 rotates in the opposite direction. The contactors KM1 and KM2 cannot be connected to the power at the same time. In the respective branches of the coils of the contactors KM1 and KM2, a pair of auxiliary normally closed contacts are connected in series with each other to ensure that the contactors KM1 and KM2 will not be connected to the power at the same time. The role played by these two pairs of auxiliary normally closed contacts of the contactors KM1 and KM2 in the circuit is called interlocking or interlocking.

[0036] When starting in the forward direction, press the start button SB2, the coil of contactor KM1 is energized, and the auxiliary normally open contact of contactor KM1 connected in parallel with SB2 is closed to ensure that the coil of contactor KM1 is continuously energized. The main contact of contactor KM1 connected in series in the circuit of motor 9 is continuously closed, and motor 9 continuously runs in the forward direction, driving the screw 10 to rotate in the forward direction.

[0037] Stop process: Press the stop button SB1, the contactor KM1 coil is de-energized, and the auxiliary contacts of the contactor KM1 connected in parallel with SB2 are disconnected to ensure that the contactor KM1 coil is continuously de-energized. The main contacts of the contactor KM1 connected in series in the motor 9 circuit are continuously disconnected, cutting off the stator power supply of the motor 9 and causing the motor 9 to stop.

[0038] When starting in reverse, press the start button SB3, the contactor KM2 coil is energized, and the auxiliary normally open contact of the contactor KM2 in parallel with SB3 is closed to ensure that the contactor KM2 coil is continuously energized. The main contact of the contactor KM2 connected in series in the circuit of the motor 9 is continuously closed, and the motor 9 continuously runs in reverse, driving the screw 10 to rotate in the reverse direction.

[0039] A method for increasing the service life of a coating machine rolling line roller, comprising the following contents:

[0040] 1) An adjustment roller 8 driven by a motor 9 is arranged between the rolling line roller 1 and the steering roller 7;

[0041] 2) When the galvanizing unit is shut down for maintenance or equipment failure, the motor 9 drives the adjustment roller 8, and the adjustment roller 8 extends to push the strip 6 away from the rolling line roller 1. Figure 3 , so that the rolling line roller 1 is 15 to 20 mm away from the surface of the steel strip 6, preferably 18 to 20 mm, and at the same time the chemical coating machine is in a non-initiated state and leaves the surface of the steel strip 6; in this process, ensure that the steel strip 6 leaves the coating roller 4.

[0042] 3) When the galvanizing unit runs stably, adjust the roller 8 offline. Figure 4 , the motor 9 drives the adjustment roller 8, the adjustment roller 8 retracts and returns to the initial position, and the rolling line roller 1 resumes normal operation.

[0043] Judgment of stable operation of the galvanizing unit: After the galvanizing unit is shut down and restarted, the surface of the strip 6 is manually observed. If there is no zinc scale on the surface of the strip 6, the galvanizing unit is running stably.

[0044] The method for increasing the service life of the coating machine rolling line roller 1 does not damage the surface of the rolling line roller 1, effectively improves the surface quality and service life of the rubber roller, thereby improving the post-treatment coating surface quality of the galvanized product, reducing defects, improving the quality of the galvanized product, improving the uniformity of product coating, and reducing costs.

Claims

1. A method for increasing the service life of a coating machine rolling line roller, characterized in that: Includes the following: 1) An adjustment roller driven by a motor is arranged between the rolling line roller and the steering roller; 2) When the galvanizing unit is shut down for maintenance or equipment failure, the motor drives the adjusting roller, which extends to drive the strip to separate from the rolling line roller, so that the rolling line roller is 15 to 20 mm away from the strip surface, and the chemical coating machine is not in operation and leaves the strip surface; 3) When the galvanizing unit runs stably, the motor drives the adjusting roller, the adjusting roller retracts, and the rolling line roller resumes normal operation; The galvanizing unit is judged to be running stably: after the galvanizing unit is shut down and restarted, the surface of the steel strip is manually observed. If there is no zinc scale on the surface of the steel strip, the galvanizing unit is running stably.

2. A device for improving the service life of a coating machine rolling line roller for implementing the method of claim 1, characterized in that: It includes an adjusting roller, a motor, a lead screw, a nut and a sleeve. The output shaft of the motor is fixedly connected to the lead screw, the lead screw is threadedly connected to the nut, the nut is fixedly connected to the sleeve, the sleeve is connected to the adjusting roller, and the adjusting roller moves back and forth in a straight line under the drive of the motor. In the working state, the motor drives the adjusting roller to the working position, and the adjusting roller pushes the strip above the steering roller to make the strip separate from the rolling line roller. In the non-working state, the motor drives the adjusting roller back to the initial position, and the adjusting roller separates from the strip above the steering roller.

3. A device for increasing the service life of a coating machine rolling line roller according to claim 2, characterized in that: The adjusting roller is a steel roller.

4. A device for increasing the service life of a coating machine rolling line roller according to claim 2, characterized in that: The diameter of the adjusting roller is 200-300 mm.

5. The device for increasing the service life of the coating machine rolling line roller according to claim 2, characterized in that: The motor is fixed on a fixed support of the rolling line roller.

6. The device for increasing the service life of the coating machine rolling line roller according to claim 2, characterized in that: It also includes a bracket, two ends of the adjustment roller are connected to the bracket, and the middle of the bracket is fixedly connected to the sleeve.

7. A device for increasing the service life of a coating machine rolling line roller according to claim 2, characterized in that: It also includes a track and a small wheel. The track is fixedly connected to a fixed support of the rolling line roller, and the small wheel is connected to the bottom of the casing, and the small wheel can move on the track.

8. The device for increasing the service life of the coating machine rolling line roller according to claim 2, characterized in that: The motor is a three-phase asynchronous motor.

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