A device and method for improving uniform density control of copper foil surface

Abstract

The present invention relates to the technical field of electrolytic copper foil, and specifically to a device and method for improving the uniform density control of the copper foil surface, comprising: an encoder, the rotating shaft of the encoder is connected to a meter wheel, the circumferential surface of the meter wheel abuts against the circumferential surface of the cathode roller; a power module, electrically connected to the cathode roller, suitable for providing current to the cathode roller; a controller, electrically connected to the encoder and the power module, respectively, suitable for calculating the instantaneous linear velocity of the circumferential surface of the meter wheel, and suitable for controlling the current value provided by the power module to the cathode roller based on the instantaneous linear velocity of the circumferential surface of the meter wheel. The present application monitors the instantaneous linear velocity of the circumferential surface of the cathode roller in real time, and adjusts the current value provided by the power module to the cathode roller in real time, thereby improving the uniformity of the density of the copper foil on the surface of the cathode roller.

Description

Technical Field

[0001] The invention relates to the technical field of electrolytic copper foil, and in particular to a device and method for controlling the uniform density of a copper foil surface. Background Art

[0002] The production of electrolytic copper foil generally adopts the roller continuous electrolysis method, the principle of which is to immerse the cathode roller in the electrolytic solution and then pass a low voltage and high current direct current to deposit the copper ions in the electrolytic solution on the titanium surface of the cathode roller to form copper foil, and then perform peeling, winding and other processes to form copper foil products. The surface density of copper foil is affected by the current and the rotation speed of the cathode roller.

[0003] In actual production, the cathode roller is affected by mechanical installation and mechanical precision on the one hand, and aging occurs as the production time increases on the other hand, causing the cathode roller to have unstable rotation speed, which affects the uniformity of the copper foil surface density. The existing solution is to adjust the installation accuracy of the cathode roller or replace the cathode roller, but this method is cumbersome and the replacement of the cathode roller greatly increases the production cost. Summary of the invention

[0004] In view of this, the present invention provides a device and method for improving the uniform density control of the copper foil surface, so as to solve the problem that the process of improving the uniformity of the copper foil surface density is relatively complicated and the production cost is greatly increased.

[0005] In a first aspect, the present invention provides a device for improving the uniform density of a copper foil surface, which is used to adjust the surface density of the copper foil on a cathode roller, comprising:

[0006] An encoder, wherein a rotating shaft of the encoder is connected to a meter wheel, and a circumferential surface of the meter wheel abuts against a circumferential surface of the cathode roller;

[0007] A power module, electrically connected to the cathode roller, and adapted to provide current to the cathode roller;

[0008] The controller is electrically connected to the encoder and the power module respectively, and is suitable for calculating the instantaneous linear velocity of the circumferential surface of the meter wheel, and is suitable for controlling the current value provided by the power module to the cathode roller based on the instantaneous linear velocity of the circumferential surface of the meter wheel.

[0009] The circumferential surface of the meter wheel abuts against the circumferential surface of the cathode roller, so that the rotation of the cathode roller drives the meter wheel to rotate, and the meter wheel and the cathode roller have the same instantaneous linear velocity. The instantaneous linear velocity of the circumferential surface of the meter wheel can be determined by calculating the instantaneous linear velocity of the circumferential surface of the cathode roller. The computer obtains the compensation value of the current based on the instantaneous linear velocity of the circumferential surface of the cathode roller, and controls the power module to provide the cathode roller with the current value after current compensation. The present application adjusts the current value provided by the power module to the cathode roller in real time by real-time monitoring of the instantaneous linear velocity of the circumferential surface of the cathode roller, thereby improving the uniformity of the density of the copper foil on the surface of the cathode roller. The process is simple and compared with the solution of replacing the cathode roller, the present application saves production costs.

[0010] In an optional implementation, it also includes:

[0011] A fixed plate, the encoder is fixedly arranged on the fixed plate, and the rotating shaft of the encoder passes through the fixed plate;

[0012] An adjusting rod is rotatably arranged on the fixing plate;

[0013] An adjusting ring, which is sleeved on the adjusting rod and is rotatably connected to the adjusting rod;

[0014] A spring, one end of which is fixed on the fixing plate, and the other end of which is fixed on the outer side wall of the adjusting ring.

[0015] In an optional implementation, it also includes:

[0016] A first threaded hole is provided on the circumferential surface of the adjusting ring and penetrates to the inner wall of the adjusting ring;

[0017] The first bolt is threaded in the first threaded hole and is suitable for abutting against the adjusting rod.

[0018] By rotating the adjusting ring, the spring can be stretched, so that the circumferential surface of the meter wheel and the circumferential surface of the cathode roller are closely abutted, so as to prevent the cathode roller from sliding relative to each other when driving the meter wheel to rotate, resulting in an error between the calculated instantaneous linear velocity of the circumferential surface of the meter wheel and the instantaneous linear velocity of the circumferential surface of the cathode roller. Therefore, it is necessary to make the circumferential surface of the meter wheel and the circumferential surface of the cathode roller closely abut. Specifically, when the adjusting ring is rotated in the first direction, the adjusting ring pulls the spring in the first direction, so that the spring pulls the fixing plate, and then drives the circumferential surface of the meter wheel to abut against the circumferential surface of the cathode roller, wherein the force of the spring can make the circumferential surface of the meter wheel and the circumferential surface of the cathode roller closely abut. After the adjustment is completed, the first bolt is screwed into the first threaded hole, so that the first bolt abuts against the surface of the adjusting rod, so that the adjusting rod and the adjusting ring are in a mutually fixed connection state. When the adjusting ring is rotated in the second direction, the adjusting ring pulls the spring in the second direction, so that the spring pulls the fixing plate, thereby driving the circumferential surface of the meter wheel to abut against the circumferential surface of the cathode roller, wherein the action force of the spring can make the circumferential surface of the meter wheel and the circumferential surface of the cathode roller reach a tight abutment state. After the adjustment is completed, the first bolt is screwed into the first threaded hole so that the first bolt abuts against the surface of the adjusting rod, so that the adjusting rod and the adjusting ring are in a state of fixed connection with each other.

[0019] In an optional implementation, it also includes:

[0020] A fixing seat is provided with a mounting hole, the adjusting rod is inserted into the mounting hole, and an adjusting gap is provided between the mounting hole and the side wall of the fixing seat;

[0021] A second threaded hole, penetrating the adjustment gap to the side wall of the fixing seat;

[0022] The second bolt is threaded in the second threaded hole and is suitable for adjusting the adjustment gap.

[0023] The second bolt is screwed into the second threaded hole. The size of the adjustment gap can be changed by turning the second bolt. When setting the adjustment gap, the adjustment gap should be driven to clamp the adjustment rod in the process from the maximum opening to the minimum opening. By increasing the opening of the adjustment gap through the second bolt and the second threaded hole, the position of the adjustment rod in the installation hole can be adjusted, that is, the distance between the fixing plate and the fixing seat can be adjusted. By reducing the opening of the adjustment gap through the second bolt and the second threaded hole, the adjustment rod can be fixed in the installation hole.

[0024] In an optional implementation, it also includes:

[0025] The laser shielding sheet is connected to the outer edge of the end side of the cathode roller and is partially located outside the cathode roller.

[0026] In an optional implementation, it also includes:

[0027] A laser emitter and a laser receiver are respectively arranged on both sides of the cathode roller. The opposing rays formed by the laser emitter and the laser receiver pass through the annular surface formed by the movement path of the laser shielding sheet. Every time the cathode roller rotates one circle, the laser shielding sheet will shield the opposing rays formed by the laser emitter and the laser receiver once, so that the time taken for the cathode roller to rotate one circle can be determined, and the average linear velocity of the cathode roller in one circle can be calculated using the diameter of the cathode roller.

[0028] The laser transmitter and the laser receiver are both connected to the controller. The controller can calculate the average linear velocity of the cathode roller during one rotation through the signals of the laser transmitter and the laser receiver.

[0029] In an optional implementation, the laser transmitter and the laser receiver are respectively provided with brackets, which can support the laser transmitter and the laser receiver.

[0030] In a second aspect, the present invention further provides a method for improving the uniform density control of a copper foil surface, which is suitable for the above-mentioned device for improving the uniform density control of a copper foil surface, and comprises the following steps:

[0031] S1, rotating the adjusting ring so that the circumferential surface of the meter wheel abuts against the circumferential surface of the cathode roller, and tightening the first bolt to fix the adjusting ring;

[0032] S2, calculating the instantaneous linear velocity of the circumferential surface of the meter wheel in real time;

[0033] S3, calculating the current adjustment value based on the instantaneous linear velocity of the circumferential surface of the meter wheel;

[0034] S4, controlling the power module to output the obtained current adjustment value to the cathode roller.

[0035] In an optional implementation, it also includes:

[0036] S5, calculating the average linear velocity of the cathode roller based on the laser transmitter and the laser receiver;

[0037] S6, checking the instantaneous linear velocity of the circumferential surface of the meter wheel by obtaining the average linear velocity of the cathode roller.

[0038] In an optional implementation, in step S3, the current adjustment value is calculated as follows:

[0039]

[0040] Wherein, V is the instantaneous linear velocity of the circumferential surface of the meter wheel, V0 is the set speed, K is the fixed coefficient, C is the current adjustment value, A is the set current value, and B is the total current rated value.

[0041] The present application can obtain the adjusted current setting value through a specific control algorithm, that is, a calculation formula for the current adjustment value, and then transmit the current value to the cathode roller, so that a closed loop is formed between the power supply and the cathode roller, and the cathode roller can be continuously adjusted. The compensation power supply is provided in real time by controlling the power supply module, and the magnitude of the current changes with the fluctuation of the cathode roller speed.

[0042] The present application calculates the instantaneous linear velocity of the circumferential surface of the meter wheel in real time, and determines the current adjustment value through the corresponding relationship between the instantaneous linear velocity of the circumferential surface of the meter wheel, that is, the instantaneous linear velocity of the circumferential surface of the cathode roller, and the current value output by the power module to the cathode roller, thereby changing the current value output by the power module to the cathode roller in real time when the instantaneous linear velocity of the circumferential surface of the cathode roller changes, thereby achieving the purpose of improving the uniform density of the copper foil surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0044] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0045] Figure 2 This is a schematic diagram of the structure of the fixing base of Example 1 of the present invention;

[0046] Figure 3 This is a schematic diagram of the position of the laser shielding sheet in Example 1 of the present invention;

[0047] Figure 4 This is a schematic diagram of the process of Example 2 of the present invention.

[0048] Description of reference numerals:

[0049] 1. Encoder; 2. Meter wheel; 3. Cathode roller; 4. Fixed plate; 5. Adjustment rod; 6. Adjustment ring; 7. Spring; 8. First threaded hole; 9. Fixed seat; 10. Adjustment gap; 11. Second threaded hole; 12. Laser shielding sheet; 13. Laser transmitter; 14. Laser receiver. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 those skilled in the art without creative work are within the scope of protection of the present invention.

[0051] The production of electrolytic copper foil generally adopts the roller continuous electrolysis method, the principle of which is to immerse the cathode roller in the electrolytic solution and then pass a low voltage and high current direct current through the rectifier to deposit the copper ions in the electrolytic solution on the titanium surface of the cathode roller to form copper foil, and then perform peeling, winding and other processes to form copper foil products. The surface density of copper foil is affected by the current and the rotation speed of the cathode roller.

[0052] In actual production, the cathode roller is affected by mechanical installation and mechanical precision on the one hand, and aging occurs as the production time increases on the other hand, causing the cathode roller to have unstable rotation speed, which affects the uniformity of the copper foil surface density. The existing solution is to adjust the installation accuracy of the cathode roller or replace the cathode roller, but this method is cumbersome and the replacement of the cathode roller greatly increases the production cost.

[0053] The linear speed formula of the cathode roller is as follows: where W is the instantaneous linear speed of the cathode roller; I is the current value; M is the electrochemical equivalent; η is the current utilization rate, M is the standard weight of the cathode roller; L is the diameter of the cathode roller.

[0054]

[0055] It can be seen from Formula 1 that the weight of copper foil produced per unit time is related to the instantaneous linear speed W of the cathode roller, the output current I of the rectifier, the current utilization rate η and the diameter L of the cathode roller. In order to ensure the uniformity of the thickness passing through, the instantaneous linear speed of the cathode roller and the current provided by the rectifier are two crucial parameters.

[0056] Combining one or more of the above factors will cause fluctuations in the surface density detected above. Therefore, we consider reducing the unevenness of the copper foil surface density by real-time detecting the instantaneous linear velocity W of the cathode roller and providing current compensation in real time according to its changes, thereby improving the uniform density of the copper foil surface.

[0057] Example 1

[0058] Combine the following Figures 1 to 3 , describing embodiment 1 of the present invention.

[0059] The present invention provides a device for improving the uniform density of the copper foil surface, which is used to adjust the copper foil surface density on the cathode roller 3, comprising:

[0060] An encoder 1, wherein the rotating shaft of the encoder 1 is connected with a meter wheel 2, and the circumferential surface of the meter wheel 2 abuts against the circumferential surface of the cathode roller 3; in order to make the circumferential surface of the meter wheel 2 closely contact with the circumferential surface of the cathode roller 3, the meter wheel 2 can be made of polyurethane material, which has a relatively large friction coefficient and can effectively prevent slipping between the meter wheel 2 and the cathode roller 3 due to the copper sulfate solution sticking to the cathode roller 3. At the same time, the polyurethane material is corrosion-resistant and can avoid corrosion caused by contact with the copper sulfate solution.

[0061] A power module is electrically connected to the cathode roller 3 and is suitable for providing current to the cathode roller 3; the power module may be a rectifier.

[0062] The controller is electrically connected to the encoder 1 and the power module respectively, and is suitable for calculating the instantaneous linear velocity of the circumferential surface of the meter wheel 2, and is suitable for controlling the current value provided by the power module to the cathode roller 3 based on the instantaneous linear velocity of the circumferential surface of the meter wheel 2.

[0063] The circumferential surface of the meter wheel 2 is in contact with the circumferential surface of the cathode roller 3, so that the rotation of the cathode roller 3 drives the meter wheel 2 to rotate, and the meter wheel 2 and the cathode roller 3 have the same instantaneous linear velocity. The instantaneous linear velocity of the circumferential surface of the meter wheel 2 can be determined by calculating the instantaneous linear velocity of the circumferential surface of the cathode roller 3. The computer obtains the compensation value of the current based on the instantaneous linear velocity of the circumferential surface of the cathode roller 3, and controls the power module to provide the current value after current compensation to the cathode roller 3. The present application monitors the instantaneous linear velocity of the circumferential surface of the cathode roller 3 in real time, and adjusts the current value provided by the power module to the cathode roller 3 in real time, thereby improving the uniformity of the density of the copper foil on the surface of the cathode roller 3.

[0064] The encoder 1 is a rotary encoder 1, which can convert the position signal into a pulse signal. The controller captures the pulse signal and restores the pulse signal to a speed signal through formula 1. The current compensation adjustment value of the rectifier is then calculated through formula 2. The controller sends the current adjustment value to the rectifier through CAN communication, and the rectifier outputs the current according to the value transmitted by the CAN communication. The rectifier of the present application can be a high-precision rectifier. Specifically, a high-precision linear power supply with a model of TBFBG-250A / 7V or a model of TBFBG-2500A / 7V can be used. The high-precision rectifier responds quickly to the current adjustment value, and the time from the detection of the instantaneous linear speed of the cathode roller 3 to the current output of the rectifier can be less than 20ms, ensuring timely compensation of the current. The controller may include a processor and a calculator.

[0065] Among them, the high-precision linear power supply with model TBFBG-250A / 7V or model TBFBG-2500A / 7V has the following advantages:

[0066] 1. Small size and light weight: The size and weight are 1 / 5-1 / 10 of the thyristor electroplating rectifier, which is convenient for planning, expansion, movement, maintenance and installation.

[0067] 2. Good energy-saving effect: The switching power supply uses a high-frequency transformer, which greatly improves the conversion efficiency. Under normal circumstances, the rectifier has the advantage of improving the efficiency by more than 10% compared with the thyristor equipment. When the load rate is below 70%, the efficiency is improved by more than 30% compared with the thyristor equipment.

[0068] 3. High output stability: Due to the fast system response speed (microsecond level), the rectifier has strong adaptability to grid power and load changes, and the output accuracy can be better than 1%. The switching power supply has high working efficiency, so the control accuracy is high, which is conducive to improving product quality.

[0069] 4. The output waveform is easy to modulate: Due to the high operating frequency, the output waveform adjustment is relatively low in processing cost, and the output waveform can be easily changed according to the user's process requirements. This has a strong effect on improving work efficiency at the work site and improving the quality of processed products.

[0070] Wherein, formula 1 is:

[0071]

[0072] V is the instantaneous linear velocity of the circumferential surface of the meter wheel 2, N is the number of pulses generated by the encoder 1 within the time T, R is the radius of the meter wheel 2, and D is the number of pulses generated by the encoder 1 when it rotates one circle. In this embodiment, the value of D can be 5000.

[0073] Formula 2 is the calculation formula for the current adjustment value, namely:

[0074]

[0075] Wherein, V is the instantaneous linear velocity of the circumferential surface of the meter wheel 2, V0 is the set speed, K is the fixed coefficient, C is the current adjustment value, A is the set current value, and B is the total current rated value.

[0076] In an optional implementation, it also includes:

[0077] A fixed plate 4, on which the encoder 1 is fixedly arranged, and a rotating shaft of the encoder 1 passes through the fixed plate 4;

[0078] The adjusting rod 5 is rotatably arranged on the fixed plate 4; the encoder 1 and the adjusting rod 5 can be respectively arranged at two end positions of the fixed plate 4, and the adjusting rod 5 can be rotatably connected to the fixed plate 4 through a bearing. Specifically, the adjusting rod 5 can pass through the fixed plate 5, and the bearing is arranged between the fixed plate 4 and the adjusting rod 5.

[0079] An adjusting ring 6 is sleeved on the adjusting rod 5 and is rotatably connected to the adjusting rod 5. A bearing may be provided between the adjusting ring 6 and the adjusting rod 5 so that the adjusting ring 6 and the adjusting rod 5 are rotatably connected;

[0080] A spring 7 , one end of which is fixed on the fixing plate 4 , and the other end of which is fixed on the outer side wall of the adjusting ring 6 .

[0081] In an optional implementation, it also includes:

[0082] A first threaded hole 8 is provided on the circumferential surface of the adjusting ring 6 and penetrates to the inner wall of the adjusting ring 6;

[0083] The first bolt is screwed into the first threaded hole 8 and is suitable for abutting against the adjusting rod 5 .

[0084] By rotating the adjusting ring 6, the spring 7 can be stretched, so that the circumferential surface of the meter wheel 2 and the circumferential surface of the cathode roller 3 are closely abutted, so as to prevent the cathode roller 3 from sliding relative to each other when driving the meter wheel 2 to rotate, resulting in an error between the calculated instantaneous linear velocity of the circumferential surface of the meter wheel 2 and the instantaneous linear velocity of the circumferential surface of the cathode roller 3. Therefore, it is necessary to make the circumferential surface of the meter wheel 2 and the circumferential surface of the cathode roller 3 closely abut. Specifically, when the adjusting ring 6 is rotated in the first direction, the adjusting ring 6 pulls the spring 7 in the first direction, so that the spring 7 pulls the fixing plate 4, and then drives the circumferential surface of the meter wheel 2 to abut against the circumferential surface of the cathode roller 3, wherein the force of the spring 7 can make the circumferential surface of the meter wheel 2 and the circumferential surface of the cathode roller 3 closely abut. After the adjustment is completed, the first bolt is screwed into the first threaded hole 8, so that the first bolt is pressed against the surface of the adjusting rod 5, so that the adjusting rod 5 and the adjusting ring 6 are in a mutually fixed connection state. When the adjusting ring 6 is rotated in the second direction, the adjusting ring 6 pulls the spring 7 in the second direction, so that the spring 7 pulls the fixing plate 4, thereby driving the circumferential surface of the meter wheel 2 to abut against the circumferential surface of the cathode roller 3, wherein the force of the spring 7 can make the circumferential surface of the meter wheel 2 and the circumferential surface of the cathode roller 3 reach a tight abutment state, and after adjustment, the first bolt is screwed into the first threaded hole 8 so that the first bolt abuts against the surface of the adjusting rod 5, so that the adjusting rod 5 and the adjusting ring 6 are in a mutually fixed connection state. The first direction and the second direction are opposite, specifically, the first direction can be clockwise, and the second direction can be counterclockwise.

[0085] By adjusting the adjusting ring 6 and the spring 7, the meter wheel 2 and the cathode roller 3 can be tightly connected, so that the instantaneous linear speed of the cathode roller 3 can be accurately calculated.

[0086] In an optional implementation, it also includes:

[0087] The fixing seat 9 is provided with a mounting hole, the adjusting rod 5 is inserted into the mounting hole, and an adjusting gap 10 is provided between the mounting hole and the side wall of the fixing seat 9;

[0088] A second threaded hole 11 passes through the adjustment gap 10 to the side wall of the fixing seat 9;

[0089] The second bolt is screwed into the second threaded hole 11 and is suitable for adjusting the adjustment gap 10 .

[0090] The second bolt is screwed into the second threaded hole 11. Turning the second bolt can change the size of the adjustment gap 10. When setting the adjustment gap 10, the adjustment gap 10 should be driven by the mounting hole to clamp the adjustment rod 5 in the process from the maximum opening to the minimum opening. By increasing the opening of the adjustment gap 10 through the second bolt and the second threaded hole 11, the position of the adjustment rod 5 in the mounting hole can be adjusted, that is, the distance between the fixing plate 4 and the fixing seat 9 can be adjusted. By reducing the opening of the adjustment gap 10 through the second bolt and the second threaded hole 11, the adjustment rod 5 can be fixed in the mounting hole.

[0091] In an optional implementation, it also includes:

[0092] The laser shielding sheet 12 is connected to the outer edge of the end side of the cathode roller 3 , and is partially located outside the cathode roller 3 .

[0093] In an optional implementation, it also includes:

[0094] The laser emitter 13 and the laser receiver 14 are respectively arranged on both sides of the cathode roller 3. The opposing rays formed by the laser emitter 13 and the laser receiver 14 pass through the annular surface formed by the movement path of the laser shielding sheet 12. Every time the cathode roller 3 rotates one circle, the laser shielding sheet 12 will shield the opposing rays formed by the laser emitter 13 and the laser receiver 14 once, so that the time taken by the cathode roller 3 to rotate one circle can be determined, and the average linear velocity of the cathode roller 3 in one circle can be calculated using the diameter of the cathode roller 3.

[0095] The laser transmitter 13 and the laser receiver 14 are both connected to the controller. The controller can calculate the average linear velocity of the cathode roller 3 during one rotation through the signals of the laser transmitter 13 and the laser receiver 14.

[0096] In an optional implementation, the laser emitter 13 and the laser receiver 14 are respectively provided with brackets, which can support the laser emitter 13 and the laser receiver 14 .

[0097] This application uses a laser beam device to check whether the speed obtained by the encoder 1 is accurate. The laser beam meter consists of a laser transmitter 13 and a laser receiver 14. An NPN laser beam meter can be selected, and it has VCC, GND, and OUT signals. The laser transmitter 13 and the laser receiver 14 are respectively installed on the two sides of the cathode roller 3. Each time the cathode roller 3 rotates one circle, the laser beam is blocked, and the laser receiver 14 OUT signal can receive a low level. According to the radius of the cathode roller 3, the average linear velocity of the cathode roller 3 for one rotation can be calculated by the controller. By comparing the average linear velocity of the cathode roller 3 with the instantaneous velocity of the cathode roller 3, it can be verified whether the speed calculated by the encoder 1 is accurate.

[0098] Among them, the wiring advantages of NPN through-beam sensors mainly include the following aspects:

[0099] Simple wiring: NPN through-beam sensors usually require three wires: power line, signal line and ground line. This wiring method is relatively simple and easy to implement.

[0100] Widely used: NPN sensors are often used to detect the absence or abnormality of objects, such as detecting whether a person has entered a dangerous area in a safety system. Its output signal is low level effective and is suitable for occasions that require low level triggering, such as the input module of a PLC.

[0101] Flexibility and reliability: The signal line of the NPN sensor outputs a high level signal when the sensor is not triggered, and a low level signal when the sensor is triggered. This wiring method makes the NPN sensor more flexible and reliable in certain specific applications.

[0102] Strong anti-interference ability: NPN sensors have the advantages of fast response speed and strong anti-interference ability, and can work stably in complex industrial environments.

[0103] Cost-effectiveness: In some occasions where cost requirements are high, NPN sensors are widely used due to their cost-effectiveness.

[0104] Wiring method of NPN through-beam sensor:

[0105] Three-wire wiring: the power line is connected to the positive pole of the power supply, the signal line is connected to the input terminal of the controller, and the ground line is connected to the negative pole of the power supply. When the sensor is triggered, the signal line outputs a low-level signal.

[0106] Four-wire wiring: The four-wire sensor wiring has an additional output wire, which distinguishes between normally open and normally closed. Generally, the black output wire is normally open and the white output wire is normally closed.

[0107] Example 2

[0108] Combine the following Figure 4 , describing embodiment 2 of the present invention.

[0109] The present invention also provides a method for improving the uniform density control of the copper foil surface, which is suitable for the above-mentioned device for improving the uniform density control of the copper foil surface, and comprises the following steps:

[0110] S1, rotating the adjusting ring 6 so that the circumferential surface of the meter wheel 2 abuts against the circumferential surface of the cathode roller 3, and tightening the first bolt to fix the adjusting ring 6;

[0111] S2, calculating the instantaneous linear velocity of the circumferential surface of the meter wheel 2 in real time;

[0112] S3, calculating the current adjustment value based on the instantaneous linear velocity of the circumferential surface of the meter wheel 2;

[0113] S4, controlling the power module to output the obtained current adjustment value to the cathode roller 3.

[0114] In an optional implementation, it also includes:

[0115] S5, calculating the average linear velocity of the cathode roller 3 based on the laser transmitter 13 and the laser receiver 14;

[0116] S6, checking the instantaneous linear velocity of the circumferential surface of the meter wheel 2 by obtaining the average linear velocity of the cathode roller 3.

[0117] In an optional implementation, in step S3, the current adjustment value is calculated as follows:

[0118]

[0119] Among them, V is the instantaneous linear speed of the circumference of the meter wheel 2, V0 is the set speed, K is the fixed coefficient, C is the current adjustment value, A is the set current value, and B is the total current rated value. It should be noted that A is the set value of the host computer (controller) and can be changed. The total rated current value generally refers to the maximum allowable output current value of the power module. The range of the set current value A is 0 to B. The current adjustment value C can be limited to set its upper and lower limits. For example, if the total current rated value B is 20000A, the set current value A can be 1000, 5000 or 20000A.

[0120] The present application can obtain the adjusted current setting value through a specific control algorithm, that is, a calculation formula for the current adjustment value, and then transmit the current value to the cathode roller 3, so that a closed loop is formed between the power supply and the cathode roller 3, and the cathode roller 3 can be continuously adjusted. The compensation power supply is provided in real time by controlling the power supply module, and the magnitude of the current changes with the rotation speed fluctuation of the cathode roller 3.

[0121] The present application calculates the instantaneous linear velocity of the circumferential surface of the meter wheel 2 in real time, and determines the current adjustment value through the corresponding relationship between the instantaneous linear velocity of the circumferential surface of the meter wheel 2, that is, the instantaneous linear velocity of the circumferential surface of the cathode roller 3, and the current value output by the power module to the cathode roller 3, thereby changing the current value output by the power module to the cathode roller 3 in real time when the instantaneous linear velocity of the circumferential surface of the cathode roller 3 changes, thereby achieving the purpose of improving the uniform density of the copper foil surface.

[0122] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A device for improving the uniform density of copper foil surface, used for adjusting the copper foil surface density on the cathode roller (3), characterized in that: include: An encoder (1), wherein the rotating shaft of the encoder (1) is connected to a meter wheel (2), and the circumferential surface of the meter wheel (2) abuts against the circumferential surface of the cathode roller (3); a power module, electrically connected to the cathode roller (3) and suitable for providing current to the cathode roller (3); The controller is electrically connected to the encoder (1) and the power module respectively, and is suitable for calculating the instantaneous linear velocity of the circumferential surface of the meter wheel (2), and is suitable for controlling the current value provided by the power module to the cathode roller (3) based on the instantaneous linear velocity of the circumferential surface of the meter wheel (2).

2. The device for controlling uniform density of copper foil surface according to claim 1, characterized in that: Also includes: A fixed plate (4), the encoder (1) being fixedly arranged on the fixed plate (4), and the rotating shaft of the encoder (1) passing through the fixed plate (4); An adjusting rod (5) rotatably disposed on the fixing plate (4); An adjusting ring (6) is sleeved on the adjusting rod (5) and is rotatably connected to the adjusting rod (5); A spring (7), one end of the spring (7) is fixed on the fixing plate (4), and the other end of the spring (7) is fixed on the outer side wall of the adjusting ring (6).

3. The device for controlling uniform density of copper foil surface according to claim 2, characterized in that: Also includes: A first threaded hole (8) is provided on the circumferential surface of the adjusting ring (6) and penetrates to the inner wall of the adjusting ring (6); The first bolt is threaded in the first threaded hole (8) and is suitable for abutting against the adjusting rod (5).

4. The device for controlling uniform density of copper foil surface according to claim 2, characterized in that: Also includes: The fixing seat (9) is provided with a mounting hole, the adjusting rod (5) is inserted into the mounting hole, and an adjusting gap (10) is provided between the mounting hole and the side wall of the fixing seat (9); A second threaded hole (11) passes through the adjustment gap (10) to the side wall of the fixing seat (9); A second bolt is threaded in the second threaded hole (11) and is suitable for adjusting the adjustment gap (10).

5. The device for controlling uniform density of copper foil surface according to claim 1, characterized in that: Also includes: A laser shielding sheet (12) is connected to and arranged at the outer edge of the end side of the cathode roller (3), and is partially located outside the cathode roller (3).

6. The device for controlling uniform density of copper foil surface according to claim 5, characterized in that: Also includes: A laser emitter (13) and a laser receiver (14) are respectively arranged on both sides of the cathode roller (3), and the pair of rays formed by the laser emitter (13) and the laser receiver (14) pass through an annular surface formed by the movement path of the laser shielding sheet (12); The laser transmitter (13) and the laser receiver (14) are both connected to the controller.

7. The device for controlling uniform density of copper foil surface according to claim 6, characterized in that: The laser transmitter (13) and the laser receiver (14) are respectively provided with brackets.

8. A method for improving the uniform density control of copper foil surface, suitable for the device for improving the uniform density control of copper foil surface as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: S1, rotating the adjusting ring (6) so that the circumferential surface of the meter wheel (2) abuts against the circumferential surface of the cathode roller (3), and tightening the first bolt to fix the adjusting ring (6); S2, calculating in real time the instantaneous linear velocity of the circumferential surface of the meter wheel (2); S3, calculating the current adjustment value based on the instantaneous linear velocity of the circumferential surface of the meter wheel (2); S4, controlling the power module to output the obtained current adjustment value to the cathode roller (3).

9. The method for improving the uniform density control of the copper foil surface according to claim 8, characterized in that: Also includes: S5, calculating the average linear velocity of the cathode roller (3) based on the laser transmitter (13) and the laser receiver (14); S6, checking the instantaneous linear velocity of the circumferential surface of the meter wheel (2) by obtaining the average linear velocity of the cathode roller (3).

10. The method for improving the uniform density control of the copper foil surface according to claim 8, characterized in that: In step S3, the current adjustment value is calculated as follows: Wherein, V is the instantaneous linear velocity of the circumferential surface of the meter wheel (2), V0 is the set speed, K is the fixed coefficient, C is the current adjustment value, A is the set current value, and B is the total current rated value.

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