Method for controlling the height of conductive welding wheel on lap welding machine of cold rolling continuous annealing line

Abstract

The present invention discloses a method for controlling the height of a conductive welding wheel on a cold rolling continuous annealing line lap welding machine. The method comprises a servo motor drive mechanism and a laser rangefinder. The control process is as follows: 1) a PLC control module stores the radius of the upper conductive welding wheel before grinding; 2) the radius of the upper conductive welding wheel after grinding is calculated; 3) a target value of the lower wheel rim of the upper conductive welding wheel deviating from a position L after grinding is calculated; and 4) height adjustment of the upper conductive welding wheel is controlled based on a comparison between the target value of the lower wheel rim and an actual measured value. The method measures the amount of rim change at a specified position of the upper conductive welding wheel using a laser rangefinder, calculates the dimensional change in the diameter direction of the upper conductive welding wheel after grinding, and controls the servo motor driving the upper conductive welding wheel to adjust the upper and lower motion of the upper conductive welding wheel, thereby adjusting the height of the central axis of the upper conductive welding wheel and ensuring that the lower edge of the upper conductive welding wheel is always at a reference height position for strip welding on the production line, thereby improving the strip welding quality.

Description

Technical Field

[0001] The present invention belongs to the technical field of lap welding machines for cold rolling continuous annealing lines, and in particular relates to a method for controlling the height of a conductive welding wheel on a lap welding machine for a cold rolling continuous annealing line. Background Art

[0002] In the steel industry, Taylor narrow lap welding machine is widely used in cold rolling continuous annealing production line, which is designed to weld the heads and tails of the front and rear rolls of strip steel together. It is a key equipment for continuous production of cold rolling continuous annealing line; Taylor narrow lap welding machine includes an entry clamp and an exit clamp, and the entry clamp and the exit clamp both include an upper clamp and a lower clamp, and the upper clamp and the lower clamp of the entry clamp and the exit clamp are arranged vertically opposite to each other, and the entry clamp and the exit clamp are arranged opposite to each other along the running direction of the strip steel, and an upper conductive welding wheel and a lower conductive welding wheel arranged vertically opposite to each other are arranged between the entry clamp and the exit clamp, and two upper conductive welding wheels and two lower conductive welding wheels are respectively provided. During welding, the entry clamp clamps the head of the rear roll of strip steel, and the exit clamp clamps the tail of the front roll of strip steel. The tail of the front roll of strip steel and the head of the rear roll of strip steel are both placed on the top surface of the lower conductive welding wheel, and the circumference of the lower conductive welding wheel and the upper conductive welding wheel are energized to generate current, and a large amount of heat is generated at the contact resistance between the two welds to weld the welds Melt and weld; after each welding of the lower conductive welding wheel and the upper conductive welding wheel is completed, the welding wheel returns to the initial position and is automatically ground. Each time the welding is ground, some copper will be ground off the surface of the lower conductive welding wheel and the upper conductive welding wheel by the grinding wheel; after the grinding is completed, the lower conductive welding wheel and the upper conductive welding wheel will automatically rise and fall for automatic elevation, so that the height difference between the highest point of the top surface of the lower conductive welding wheel and the upper conductive welding wheel and the clamp set below in the inlet clamp and the outlet clamp is 0.01-0.03mm, and the gap in this range is the optimal gap for welding; as the number of welding and grinding increases, the diameter of the lower conductive welding wheel and the upper conductive welding wheel becomes smaller, and an oxidation reaction occurs at the position where the lower conductive welding wheel and the upper conductive welding wheel contact the strip steel, which directly affects the welding quality of the strip steel. Poor strip steel welding quality is very likely to cause weld breakage in the subsequent production process. Therefore, a method for adjusting the height of the upper conductive welding wheel and a method for adjusting the height of the lower conductive welding wheel are required to ensure the welding quality of the strip steel.

[0003] The Chinese patent number is: 2021227996685, and the name of the invention is: A height adjustment device suitable for adjusting the height of the lower welding wheel of the welding machine of the cold rolling continuous annealing line, the device comprising: a block, the bottom surface of the block is provided with a through groove for the lower welding wheel to be movably embedded, and the block is provided with a through hole connected to the through groove; a lifting rod, the lower end of the lifting rod can be slidably inserted into the through hole of the block and extend into the through groove of the block, the middle part of the lifting rod has an identification section, the distance between the upper end of the identification section of the lifting rod and the lower end of the lifting rod is da, where d represents the thickness of the block, and the distance between the lower end of the identification section of the lifting rod and the lower end of the lifting rod is db, where a and b represent the lower and upper ends of the lifting rod, respectively. The minimum and maximum values ​​of the height difference between the highest point of the top surface of the welding wheel and the lower chuck are as follows: the top end of the lower welding wheel is used to lift the lower end of the lifting rod, and the indicating section of the lifting rod is exposed above the stop block. At this time, the height of the welding wheel is adjusted downward, and the lifting rod is lowered. When the indicating section of the lifting rod intersects with the top surface of the stop block, it indicates that the top surface height of the lower welding wheel is suitable for strip welding; this method is used to adjust the height of the lower welding wheel quickly and conveniently, and it is only necessary to observe whether the top surface of the stop block intersects with the identification section. This method fundamentally solves the problems of low precision, high time consumption, low efficiency and poor safety in the height adjustment of the lower welding wheel, and improves the stability and safety reliability of equipment maintenance. The structure adopts a method of manually identifying the positions of the identification sections da and db, and the recognition efficiency is low. Summary of the Invention

[0004] 1. Technical problem to be solved by the invention

[0005] The purpose of the present invention is to overcome the existing manual identification of the gap between the bottom edge position of the upper welding wheel and the welding reference position, and provide a method for controlling the height of the conductive welding wheel on the cold rolling continuous annealing line lap welding machine; the present invention uses a laser rangefinder to measure the change in the rim of the upper conductive welding wheel at a specified position, calculates the dimensional change value in the diameter direction of the upper conductive welding wheel after grinding, controls the servo motor that drives the upper conductive welding wheel to move and adjusts the upper and lower movement of the upper conductive welding wheel to adjust the height of the central axis of the upper conductive welding wheel, ensures that the lower edge of the upper conductive welding wheel is always at the reference height position for strip welding on the production line, and achieves the purpose of improving the strip welding quality.

[0006] 2. Technical solution

[0007] In order to achieve the above object, the technical solution provided by the present invention is:

[0008] A method for controlling the height of a conductive welding wheel on a cold rolling continuous annealing line lap welding machine includes a servo motor drive mechanism for driving the upper conductive welding wheel up and down, and a laser rangefinder for measuring the height of the middle of the lower wheel rim of the upper conductive welding wheel that deviates from the L position. The control process is as follows:

[0009] 1) Before the height adjustment of the upper conductive welding wheel begins, the PLC control module saves the radius of the upper conductive welding wheel before grinding;

[0010] 2) The laser rangefinder measures the output value of the upper conductive welding wheel before adjustment, and the PLC control module calculates the radius of the upper conductive welding wheel after grinding based on the output value;

[0011]

[0012] Where:

[0013] L and H1 are fixed values ​​and belong to design dimensions;

[0014] m i is the current output value of the laser rangefinder;

[0015] R i is the radius after the i-th alignment;

[0016] R i+1 Calculate the radius from the measured value before the (i+1)th alignment; record the above data;

[0017] 3) The PLC control module calculates the target value of the lower wheel rim of the upper conductive welding wheel deviating from the L position after grinding based on the calculated radius of the upper conductive welding wheel:

[0018]

[0019] 4) After the height adjustment of the upper conductive welding wheel begins, the servo motor drive mechanism drives the upper conductive welding wheel to move downward. At this time, the laser rangefinder continuously reads the laser rangefinder data M i+1 , and pass the data to the PLC control module. When the laser rangefinder measures the data M i+1 Equal to the target value m i+1 When , the PLC control module controls the servo motor drive mechanism to stop working. At this time, the lower contour of the upper conductive welding wheel moves down to the welding setting position H, completing the height adjustment of the upper conductive welding wheel.

[0020] As a further improvement of the present invention, the laser rangefinder is set to be an OMRON laser rangefinder, and a centering mechanism is provided at the bottom of the OMRON laser rangefinder for measuring the height of the middle of the lower wheel rim of the upper conductive welding wheel deviating from the L position.

[0021] As a further improvement of the present invention, the centering mechanism includes a frame arranged on the base of the lap welder, a guide rail arranged on the frame, a moving seat sliding on the guide rail and a cylinder driving the moving seat to move, and the laser rangefinder is installed on the moving seat.

[0022] As a further improvement of the present invention, the guide rail is arranged perpendicular to the upper conductive welding wheel, a limit switch is provided on the movable seat, and a pair of position sensors adapted to the position switch are provided on the frame.

[0023] 3. Beneficial effects

[0024] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0025] 1. A method for controlling the height of a conductive welding wheel on a cold rolling continuous annealing line lap welding machine of the present invention measures the rim change at a specified position of the upper conductive welding wheel through a laser rangefinder, calculates the dimensional change value in the diameter direction of the upper conductive welding wheel after grinding, controls the servo motor that drives the upper conductive welding wheel to move and adjusts the upper and lower movement of the upper conductive welding wheel to adjust the height of the central axis of the upper conductive welding wheel, ensures that the lower edge of the upper conductive welding wheel is always at the reference height position for strip welding on the production line, and achieves the purpose of improving the strip welding quality.

[0026] 2. The height control method of the conductive welding wheel on the lap welding machine of the cold rolling continuous annealing line of the present invention can effectively ensure the stability of the lower wheel edge of the conductive welding wheel on the lap resistance welding machine relative to the welding reference position, thereby ensuring the welding quality of the strip steel and avoiding the risk of weld breakage in the strip steel production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic structural diagram of a conductive welding height control device for a cold rolling continuous annealing line lap welder according to the present invention;

[0028] Figure 2 It is a side view of the conductive welding height control device for a cold rolling continuous annealing line overlap welding machine of the present invention;

[0029] Figure 3 The figure is a schematic diagram of the conductive welding height control method for a cold rolling continuous annealing line overlap welding machine according to the present invention.

[0030] Description of the numbers in the schematic diagram:

[0031] 1. Upper conductive welding wheel; 2. Cylinder floating push rod; 3. Cylinder; 4. Cylinder fixing seat; 5. Guide rail; 6. Position sensor mounting bracket; 7. Position sensor; 8. Rack; 9. Limit switch; 10. Measuring component moving base; 11. Connecting bracket; 12. Laser measuring instrument; 13. Laser measuring instrument mounting bracket. DETAILED DESCRIPTION

[0032] In order to further understand the content of the present invention, the present invention is described in detail with reference to the accompanying drawings and embodiments.

[0033] like Figure 1-Figure 3This is a schematic structural diagram of a conductive welding height control device for a cold rolling continuous annealing line lap welder according to the present invention. A method for controlling the height of a conductive welding wheel on a cold rolling continuous annealing line lap welder according to this embodiment includes a servo motor drive mechanism for driving the upper conductive welding wheel up and down, a centering mechanism for driving the upper conductive welding wheel to center, and a laser rangefinder for measuring the height of the lower wheel rim of the upper conductive welding wheel when it deviates from the L position. The control process is as follows:

[0034] 1) Before the start of adjustment and alignment, the PLC control module saves the radius of the upper conductive welding wheel before grinding;

[0035] 2) After the adjustment and alignment are completed, the centering mechanism drives the center of the upper conductive welding wheel to the welding set horizontal position, and the PLC control module calculates the radius of the upper conductive welding wheel after grinding;

[0036]

[0037] Where:

[0038] L and H1 are fixed values ​​and belong to design dimensions;

[0039] m i Output value of the current value of the laser rangefinder;

[0040] R i is the radius after the i-th alignment;

[0041] R i+1 Calculate the radius from the measured value before the (i+1)th alignment; record the above data;

[0042] 3) Before adjusting the height, the PLC control module calculates the target value of the lower wheel rim of the upper conductive welding wheel deviating from the L position after grinding:

[0043]

[0044] 4) After the height adjustment begins, the servo motor drive mechanism drives the upper conductive welding wheel to move downward. At this time, the laser rangefinder continuously reads the laser rangefinder data M i+1 , and pass the data to the PLC control module. When the laser rangefinder measures the data M i+1 Equal to the target value m i+1 When , the PLC control module controls the servo motor drive mechanism to stop working. At this time, the lower contour of the upper conductive welding wheel moves down to the welding setting position H, completing the height adjustment of the upper conductive welding wheel.

[0045] In this embodiment, the detection and actuator of the electronic control system of the automatic adjustment and centering device for the upper conductive welding wheel are mainly composed of a laser rangefinder, a position sensor, a servo motor, etc.; when the upper conductive welding wheel is ground, the laser rangefinder is driven by the cylinder to enter the measuring position to measure the position of the conductive wheel and transmit the data to the PLC and module. After calculation, the PLC and module transmit the data of the required downward movement amount of the upper conductive welding wheel to the servo motor, and the servo motor drives the conductive wheel to move downward to the set position, completing the adjustment process.

[0046] In this embodiment, the center height adjustment process of the upper conductive welding wheel 1 adopts closed-loop detection and control, the closed-loop terminal signal sampling is provided by a laser rangefinder, and the output adjustment adopts a servo motor to realize the automatic locking function.

[0047] The upper conductive welding wheel automatic adjustment and centering equipment includes a guide rail assembly, a transverse cylinder and valve group, a measuring assembly, a position sensor assembly, a servo motor and its driver, and corresponding pipelines.

[0048] The specific structure is described as follows:

[0049] Guide rail 5: It consists of a guide rail fixed seat, a double-slider linear guide, a measuring component moving seat, etc.

[0050] Frame 8: It is welded from steel plates and directly mounted on the welding machine base for mounting and fixing linear guide rails.

[0051] The linear guide rail uses standard components to ensure the movement accuracy and stability of the measuring component. The guide rail length and stroke are determined according to the measurement requirements; the measuring component moving seat is used to install the measuring component, the bottom surface is fixed on the linear guide rail slider, the upper part is connected to the transverse cylinder, and the measuring component is installed at its end; the measuring component moving seat 10 moves laterally with the measuring component under the drive of the cylinder 3.

[0052] Cylinder and valve group: consists of a transverse cylinder 3, a cylinder fixing seat 4, and a cylinder control valve group.

[0053] The lateral movement cylinder uses a single-axis double-acting cylinder, which is installed on the welding machine base through the cylinder fixing seat 4. The piston rod is connected to the measuring component moving seat through the cylinder floating push rod 2, so that the cylinder can drive the measuring component to move horizontally, enter or leave the measuring position.

[0054] The cylinder control valve consists of an electromagnetic reversing valve, a pressure control valve, and a flow regulating valve; the electromagnetic reversing valve realizes the gas circuit switching and locks the position of the measuring component, the pressure control valve adjusts the working pressure of the cylinder, and the flow regulating valve controls the movement speed of the cylinder.

[0055] Measuring component: The measuring component includes a laser measuring instrument 12 and a laser measuring instrument mounting frame 13. The distance meter uses an OMRON laser distance meter. The laser measuring instrument mounting frame 13 is directly fixed on the mounting base and can move back and forth under the drive of the cylinder to measure the set position.

[0056] Position sensor assembly: The position sensor 7 uses an inductive proximity switch, which is installed in a fixed position of the equipment through the position sensor mounting bracket 6. It is used to detect the position of the measuring assembly to facilitate the control of the cylinder stroke.

[0057] Servo motor: used to control the up and down movement of the upper conductive welding wheel to ensure its position accuracy. The servo motor is fixed on the welding wheel mounting bracket and connected to the upper conductive welding wheel adjustment screw through a coupling.

[0058] Example 1

[0059] The radius of the welding wheel before grinding R i For example, 150mm, L is 100mm, and H1 is 20mm

[0060] After grinding, the laser distance meter measures the current distance to the edge of the welding wheel in m i If it is 30mm, then R is obtained from formula (1): i+1 141.42mm;

[0061] Then, we can get m from formula (2): i+1 It is 21.42mm, that is, when the distance measured by the distance meter is 21.4mm from the edge of the welding wheel, the servo motor stops adjusting.

[0062] The above is a schematic description of the present invention and its embodiments, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs a structure and embodiment similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A method for controlling the height of a conductive welding wheel on a cold rolling continuous annealing line lap welding machine, comprising a servo motor drive mechanism for driving the upper conductive welding wheel up and down, characterized in that: The laser rangefinder is also included to measure the height of the middle of the lower wheel rim of the upper conductive welding wheel which deviates from the L position. The control process is as follows: 1) Before the height adjustment of the upper conductive welding wheel begins, the PLC control module saves the radius of the upper conductive welding wheel before grinding; 2) The laser rangefinder measures the output value of the upper conductive welding wheel before adjustment, and the PLC control module calculates the radius of the upper conductive welding wheel after grinding based on the output value; Where: L and H1 are fixed values ​​and belong to design dimensions; m i is the current output value of the laser rangefinder; R i is the radius after the i-th alignment; R i+1 Calculate the radius from the measured value before the (i+1)th alignment; record the above data; 3) The PLC control module calculates the target value of the lower wheel rim of the upper conductive welding wheel deviating from the L position after grinding based on the calculated radius of the upper conductive welding wheel: 4) After the height adjustment of the upper conductive welding wheel begins, the servo motor drive mechanism drives the upper conductive welding wheel to move downward. At this time, the laser rangefinder continuously reads the laser rangefinder data M i+1 , and pass the data to the PLC control module. When the laser rangefinder measures the data M i+1 Equal to the target value m i+1 When , the PLC control module controls the servo motor drive mechanism to stop working. At this time, the lower contour of the upper conductive welding wheel moves down to the welding setting position H, completing the height adjustment of the upper conductive welding wheel.

2. The method for controlling the height of a conductive welding wheel on a cold rolling continuous annealing line lap welding machine according to claim 1, characterized in that: The laser rangefinder is set as an OMRON laser rangefinder, and a centering mechanism is set at the bottom of the OMRON laser rangefinder for measuring the height of the middle of the lower wheel rim of the upper conductive welding wheel deviating from the L position.

3. The method for controlling the height of the conductive welding wheel on the cold rolling continuous annealing line lap welding machine according to claim 2, characterized in that: The centering mechanism comprises a frame arranged on the lap welding machine base, a guide rail arranged on the frame, a moving seat sliding on the guide rail and a cylinder driving the moving seat to move, and the laser rangefinder is installed on the moving seat.

4. The method for controlling the height of a conductive welding wheel on a cold rolling continuous annealing line lap welding machine according to claim 3, characterized in that: The guide rail is arranged perpendicularly to the upper conductive welding wheel, a limit switch is arranged on the movable seat, and a pair of position sensors adapted to the position switch is arranged on the frame.

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