Silicon steel strip pickling device and control method thereof

Abstract

The application belongs to the technical field of silicon steel strip processing, and discloses a silicon steel strip pickling device and a control method thereof. The silicon steel strip is kept moving at a constant speed, so that the pickling time of the silicon steel strip is constant. On this basis, the actual oxidation degree of each part of the surface of the silicon steel strip is detected in real time, and the flow of each spray hole is adjusted according to the actual oxidation degree of each part of the surface of the silicon steel strip. The pickling liquid spraying amount of each part of the surface of the silicon steel strip can be adjusted to the optimal pickling liquid spraying amount required by the corresponding oxidation degree, so that the conditions of over-pickling in some positions and insufficient pickling in some positions are prevented.

Description

Technical Field

[0001] This application relates to the field of silicon steel strip processing technology, and more specifically, to a silicon steel strip pickling device and its control method. Background Technology

[0002] Pickling is an essential step in the production of silicon steel strip. It removes the oxide layer from the surface of the silicon steel strip and is generally carried out using a silicon steel strip pickling device.

[0003] Existing silicon steel strip pickling equipment mainly includes a pickling solution storage tank, a pickling tank, a conveyor roller assembly, and a spraying device. The pickling solution storage tank stores the pickling solution, and the spraying device is located above the pickling tank. The conveyor roller assembly drives the silicon steel strip through the pickling tank, and the spraying device draws pickling solution from the storage tank and sprays it onto the silicon steel strip passing through the tank to pickle the continuously conveyed strip. While some existing silicon steel strip pickling equipment can adjust the spray flow rate to accommodate different oxidation levels of the silicon steel strip, the oxidation level varies at different locations. Current equipment typically only adjusts the spray flow rate overall, ensuring the same amount of spray to all areas of the strip, which can easily lead to over-pickled areas and under-pickled areas.

[0004] Therefore, existing technologies need to be improved and enhanced. Summary of the Invention

[0005] The purpose of this application is to provide a pickling device and control method for silicon steel strip, which can adjust the amount of pickling liquid sprayed at different locations according to the degree of oxidation of the silicon steel strip, so as to prevent over-pickling at some locations and under-pickling at others.

[0006] In a first aspect, this application provides a pickling apparatus for silicon steel strip, including a control system and a machine base. The top of the machine base is provided with a plurality of transfer roller groups, a spraying device and a pickling tank. The machine base is provided with a pickling solution storage tank for storing pickling solution. It also includes a detection device located in front of the pickling tank. The detection device is used to detect the degree of oxidation at different positions on the upper and lower surfaces of the silicon steel strip. The transfer roller group is used to drive the silicon steel belt through the pickling tank continuously at a constant speed; The spraying device includes a circulating liquid delivery system and two spray bodies positioned vertically opposite each other within the pickling tank. A gap exists between the two spray bodies for the silicon steel strip to pass through. Multiple spray holes are arranged in a matrix on the opposite sides of the two spray bodies, with the rows parallel to the left-right direction and the columns parallel to the front-back direction. The circulating liquid delivery system draws pickling solution from the pickling solution storage tank and delivers it to the spray bodies, allowing the pickling solution to be sprayed from the spray holes to pickle the silicon steel strip. The flow rate of each spray hole in the spray bodies is independently adjustable. The control system is electrically connected to the spraying device and the detection device, and is used to control the flow rate of each of the spray holes according to the constant speed and the detection results of the detection device, so that the amount of pickling solution sprayed at each of the upper and lower surfaces of the silicon steel strip matches their respective oxidation degree.

[0007] During operation, the silicon steel strip is kept moving at a constant speed to ensure a constant pickling time. Based on this, the actual oxidation level of each part of the silicon steel strip surface is detected in real time. The flow rate of each nozzle is adjusted according to the actual oxidation level of each part of the silicon steel strip surface. This can achieve the effect of adjusting the pickling liquid spray volume of each part of the silicon steel strip surface to the optimal pickling liquid spray volume required for the corresponding oxidation level, thereby preventing over-pickling and under-pickling in some parts.

[0008] Preferably, the spray body includes a housing with an inner cavity and a plurality of flow regulating mechanisms. The spray holes are provided on the side of the housing facing another spray body, and the spray holes and the flow regulating mechanisms are arranged in a one-to-one correspondence. The inner cavity is connected to the circulating infusion system, and the flow regulating mechanism is used to independently adjust the opening of the corresponding spray hole, thereby independently adjusting the flow rate of the corresponding spray hole.

[0009] Each nozzle is equipped with a flow regulation mechanism, which can reliably adjust the flow rate of each nozzle independently.

[0010] Preferably, the flow regulating mechanism includes a valve core, a valve stem, and a drive assembly; the valve stem is slidably and sealingly connected to the housing, a first end of the valve stem extends into the inner cavity and is fixedly connected to the valve core, and a second end extends out of the housing and is drivenly connected to the drive assembly; the drive assembly is used to drive the valve stem to reciprocate axially, thereby causing the valve core to move away from or closer to the corresponding nozzle, so as to adjust the opening degree of the corresponding nozzle.

[0011] Preferably, the drive assembly includes an abutment plate, a return spring, a cam, and a motor; the abutment plate is fixedly connected to the second end of the valve stem, the cam is connected to the output shaft of the motor, and the circumferential surface of the cam abuts against the abutment plate; the return spring is used to press the abutment plate against the circumferential surface of the cam; the motor is used to drive the cam to rotate and, with the cooperation of the return spring, drive the abutment plate to reciprocate.

[0012] By adjusting the valve stem position using a cam and a motor, rapid adjustment of the valve stem position can be achieved, improving response speed and the timeliness of flow regulation for each nozzle.

[0013] Preferably, a flow equalization baffle is provided in the inner cavity of the shell, the flow equalization baffle divides the inner cavity into a static pressure chamber and a flow distribution chamber, and a plurality of flow equalization holes are evenly opened on the flow equalization baffle to connect the static pressure chamber and the flow distribution chamber. The spray hole is connected to the flow distribution chamber, and the static pressure chamber is connected to the circulating infusion system.

[0014] Preferably, a pressure sensor is provided in the static pressure chamber of each of the spray bodies, and the circulating infusion system includes two liquid pumps. The output ends of the two liquid pumps are respectively connected to the static pressure chambers of the two spray bodies through pipes. The control system is electrically connected to the pressure sensor and the liquid pump, and is used to adjust the power of the corresponding liquid pump according to the detection result of the pressure sensor to ensure that the pressure of the static pressure chamber is constant.

[0015] Optionally, the detection device includes two laser sensor groups, each laser sensor group including multiple laser sensors evenly arranged in the left-right direction. The laser sensors of the two laser sensor groups are respectively used to detect the laser reflection intensity of the upper and lower surfaces of the silicon steel strip and send it to the control system. The control system identifies the degree of oxidation of the silicon steel strip surface based on the laser reflection intensity.

[0016] Optionally, the detection device includes two cameras, two light strips, and two focusing reflectors. The light strips extend in a left-right direction, and the two focusing reflectors are respectively used to reflect the light emitted by the two light strips onto the upper and lower surfaces of the silicon steel strip to form illumination strips extending in a left-right direction. The two cameras are respectively used to take pictures of the upper and lower surfaces of the silicon steel strip including the illumination strips and send them to the control system. The control system identifies the degree of oxidation on the surface of the silicon steel strip based on the pictures.

[0017] Secondly, this application provides a control method for a silicon steel strip pickling apparatus as described above, applied to the control system of the silicon steel strip pickling apparatus, comprising the following steps: A1. Obtain the constant speed of the silicon steel strip moving at a constant speed; A2. The oxidation degree at different detection points on the upper and lower surfaces of the silicon steel strip is detected by the detection device; each detection point is aligned with a row of nozzles in the left-right direction; A3. Based on the constant speed and the oxidation degree of each detection point, a reference flow rate adjustment scheme for each column of nozzles is matched from a preset adjustment scheme database; the reference flow rate adjustment scheme includes the reference flow rate that each nozzle in a corresponding column needs to achieve when aligned with the corresponding detection point; A4. Adjust the flow rate of each nozzle according to the constant speed and the reference flow rate adjustment scheme.

[0018] Preferably, the adjustment scheme database records the reference oxidation degree corresponding to the reference flow adjustment scheme; Step A4 includes: A401. Based on the constant speed and the front-to-back distance between the detection device and each of the nozzles, calculate the delay time between each detection point and each nozzle in the corresponding column; A402. Based on the oxidation degree of each detection point and the corresponding reference flow rate adjustment scheme and the corresponding reference oxidation degree, determine the target flow rate adjustment scheme for each column of nozzles; the target flow rate adjustment scheme includes the target flow rate that each nozzle in a corresponding column needs to achieve when aligned with the corresponding detection point; A403. Adjust the flow rate of each nozzle according to the delay time corresponding to each detection point and the corresponding target flow rate adjustment scheme.

[0019] Beneficial effects: The silicon steel strip pickling device and its control method provided in this application maintain the silicon steel strip at a constant speed during operation, thereby ensuring a constant pickling time for the silicon steel strip. Based on this, the actual oxidation degree of each part of the silicon steel strip surface is detected in real time, and the flow rate of each spray hole is adjusted according to the actual oxidation degree of each part of the silicon steel strip surface. This can achieve the effect of adjusting the pickling liquid spray volume of each part of the silicon steel strip surface to the optimal pickling liquid spray volume required for the corresponding oxidation degree, thereby preventing the occurrence of over-pickling in some parts and under-pickling in some parts. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a silicon steel strip pickling device provided in an embodiment of this application.

[0021] Figure 2 This is a schematic diagram of another silicon steel strip pickling device provided in an embodiment of this application.

[0022] Figure 3 This is a diagram showing the connection structure between the pickling tank and the spraying device.

[0023] Figure 4This is a partial cross-sectional view of the spray system.

[0024] Figure 5 This is a schematic diagram of the structure of a detection device.

[0025] Figure 6 This is a schematic diagram of another detection device.

[0026] Figure 7 A flowchart of the control method provided in the embodiments of this application.

[0027] Labeling Explanation: 1. Machine base; 2. Transfer roller assembly; 201. Drive roller; 202. Dynamic pressure roller; 3. Spraying device; 301. Circulating infusion system; 3011. Liquid pump; 3012. Pipeline; 302. Spray body; 303. Spray nozzle; 304. Inner cavity; 3041. Static pressure chamber; 3042. Distribution chamber; 305. Shell; 3051. Guide sleeve; 3052. Sealing ring; 306. Flow regulating mechanism; 307. Valve core; 308. Valve 309. Rod; 3091. Drive assembly; 3092. Abutment plate; 3093. Return spring; 3094. Cam; 3095. Motor; 310. Flow equalization baffle; 311. Pressure sensor; 312. Protective cover; 313. Sealed protective cavity; 314. Sealing gasket; 4. Pickling tank; 5. Detection device; 501. Laser sensor; 502. Camera; 503. Light strip; 504. Focusing reflector; 505. Fixing bracket; 6. Rotary encoder. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0029] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] For ease of explanation, in this application, the width direction of the silicon steel strip during operation is defined as the left-right direction (i.e., Figure 1The Y-axis direction in the diagram), the direction of movement of the silicon steel strip during operation is set to backward (i.e., Figure 1 (in the positive X-axis direction), the forward and backward directions are opposite (i.e., the forward direction is...) Figure 1 The negative X-axis direction), and the normal direction of the silicon steel strip during operation is set to the up and down direction (i.e., Figure 1 (Z-axis direction in the middle).

[0031] Please refer to Figures 1-6 This is a silicon steel strip pickling device in some embodiments of this application, including a control system and a machine base 1. The top of the machine base 1 is provided with several transmission roller groups 2, a spraying device 3 and a pickling tank 4. The machine base 1 is provided with a pickling liquid storage tank for storing pickling liquid (the pickling liquid storage tank is not shown in the figure due to obstruction). It also includes a detection device 5 set in front of the pickling tank 4. The detection device 5 is used to detect the degree of oxidation at different positions on the upper and lower surfaces of the silicon steel strip. The transfer roller group 2 is used to drive the silicon steel belt through the pickling tank 4 continuously (i.e. without stopping) at a constant speed (which can be set according to actual needs); The spraying device 3 includes a circulating liquid delivery system 301 and two spray bodies 302 arranged vertically opposite each other in the pickling tank 4. A gap exists between the two spray bodies 302 for the silicon steel strip to pass through. Multiple spray holes 303 are arranged in a matrix on the opposite sides of the two spray bodies 302, with the rows parallel to the left-right direction and the columns parallel to the front-back direction (i.e., each spray body 302 has multiple rows and columns of spray holes 303, with each row of spray holes 303 arranged in a straight line at equal intervals along the left-right direction and each column of spray holes 303 arranged in a straight line at equal intervals along the front-back direction). The circulating liquid delivery system 301 draws pickling solution from the pickling solution storage tank and delivers it to the spray bodies 302, so that the pickling solution is sprayed from the spray holes 303 to pickle the silicon steel strip (see reference). Figure 3 The flow rate of each nozzle 303 in the spray body 302 is independently adjustable; The control system is electrically connected to the spraying device 3 and the detection device 5, and is used to control the flow rate of each spray hole 303 according to the constant speed and the detection results of the detection device 5, so that the amount of pickling liquid sprayed at each of the upper and lower surfaces of the silicon steel strip (the amount of pickling liquid sprayed at a certain point on the surface of the silicon steel strip refers to the total amount of pickling liquid sprayed to that point) matches the degree of oxidation of each location.

[0032] During operation, the silicon steel strip is kept moving at a constant speed to ensure a constant pickling time (because the size of the spray device 3 is constant, the time required for the silicon steel strip to pass through the location of the spray device 3 is also constant when the silicon steel strip moves at a constant speed). Based on this, the actual oxidation degree of each part of the silicon steel strip surface is detected in real time, and the flow rate of each spray hole 303 is adjusted according to the actual oxidation degree of each part of the silicon steel strip surface. This can achieve the effect of adjusting the pickling liquid spray volume of each part of the silicon steel strip surface to the optimal pickling liquid spray volume required for the corresponding oxidation degree (that is, making the pickling liquid spray volume of each part of the upper and lower surfaces of the silicon steel strip match their respective oxidation degrees), thereby preventing the occurrence of over-pickling in some parts and under-pickling in some parts.

[0033] Specifically, refer to Figure 4 The spray body 302 includes a housing 305 with an inner cavity 304 and multiple flow regulating mechanisms 306. Spray holes 303 are provided on the side of the housing 305 facing another spray body 302, with each spray hole 303 corresponding to a flow regulating mechanism 306. The inner cavity 304 is connected to the circulating infusion system 301. The flow regulating mechanism 306 is used to independently adjust the opening degree (i.e., degree of opening) of the corresponding spray hole 303, thereby independently regulating the flow rate of the corresponding spray hole 303. Each spray hole 303 is provided with one flow regulating mechanism 306, allowing for reliable independent adjustment of the flow rate of each spray hole 303.

[0034] Furthermore, see Figure 4 The flow regulating mechanism 306 includes a valve core 307, a valve stem 308, and a drive assembly 309. The valve stem 308 is slidably and sealingly connected to the housing 305. The first end of the valve stem 308 extends into the inner cavity 304 and is fixedly connected to the valve core 307. The second end extends out of the housing 305 and is drivenly connected to the drive assembly 309. The drive assembly 309 is used to drive the valve stem 308 to reciprocate axially, thereby causing the valve core 307 to move away from or closer to the corresponding nozzle 303, so as to adjust the opening degree of the corresponding nozzle 303.

[0035] Among them, reference Figure 4 The nozzle 303 and valve core 307 are matched truncated cones, and the diameter of the nozzle 303 gradually decreases in the direction away from the inner cavity 304. Thus, when the nozzle 303 needs to be closed, the valve core 307 can reliably close the nozzle 303.

[0036] Among them, reference Figure 4 A guide sleeve 3051 is provided on the housing 305 corresponding to the position of each valve stem 308. The valve stem 308 slides through the corresponding guide sleeve 3051, and at least one sealing ring 3052 is provided between the guide sleeve 3051 and the corresponding valve stem 308 to prevent the pickling solution in the inner cavity 304 from leaking.

[0037] The drive assembly 309 may be, but is not limited to, an electric telescopic rod, a rotary telescopic motor, a cylinder, etc.

[0038] In one possible implementation, see Figure 4 The drive assembly 309 includes an abutment plate 3091, a return spring 3092, a cam 3093, and a motor 3094. The abutment plate 3091 is fixedly connected to the second end of the valve stem 308. The cam 3093 is connected to the output shaft of the motor 3094, and the circumferential surface of the cam 3093 abuts against the abutment plate 3091. The return spring 3092 is used to press the abutment plate 3091 against the circumferential surface of the cam 3093. The motor 3094 is used to drive the cam 3093 to rotate and, with the cooperation of the return spring 3092, drive the abutment plate 3091 to reciprocate (thereby further driving the valve core 307 to reciprocate). The position of valve stem 308 can be adjusted by cam 3093 and motor 3094, which can realize rapid adjustment of valve stem 308 position, improve response speed, and improve the timeliness of flow adjustment of each nozzle 303 (since the silicon steel strip is not stopped during pickling, the flow of nozzle 303 is required to be quickly adjusted in order to ensure accurate control of pickling liquid spray volume at various points on the surface of silicon steel strip).

[0039] The force exerted by the return spring 3092 on the abutment plate 3091 can be directed towards the valve core 307, thereby causing the circumferential surface of the cam 3093 to abut against the side of the abutment plate 3091 closest to the valve core 307 (e.g., Figure 4 In the case shown, the return spring 3092 in the figure is a tension spring); the force exerted by the return spring 3092 on the abutment plate 3091 can also be opposite to the valve core 307, so that the circumferential surface of the cam 3093 abuts against the side of the abutment plate 3091 away from the valve core 307.

[0040] In some preferred embodiments, see Figure 4A flow equalization baffle 310 is provided in the inner cavity 304 of the housing 305. The flow equalization baffle 310 divides the inner cavity 304 into a static pressure chamber 3041 and a flow distribution chamber 3042. A plurality of flow equalization holes are evenly opened on the flow equalization baffle 310 to connect the static pressure chamber 3041 and the flow distribution chamber 3042. The spray hole 303 is connected to the flow distribution chamber 3042, and the static pressure chamber 3041 is connected to the circulating infusion system 301. Thus, the pickling solution delivered by the circulating infusion system 301 first enters the static pressure chamber 3041, then passes through the flow equalization baffle 310 into the distribution chamber 3042, and finally exits from the nozzle 303. Due to the flow equalization and blocking effect of the flow equalization baffle 310, turbulence can be avoided in the static pressure chamber 3041, making it easier to stabilize and control the pressure in the static pressure chamber 3041, thereby achieving a constant pressure control effect. When the pressure in the static pressure chamber 3041 is constant, the flow rate of each nozzle 303 is approximately only related to its own opening degree. Therefore, accurate control of the flow rate can be achieved by accurately controlling the opening degree. Thus, setting the flow equalization baffle 310 is beneficial to improving the accuracy of flow control of each nozzle 303.

[0041] Furthermore, see Figure 4 Pressure sensors 311 can be installed in the static pressure chamber 3041 of each spray body 302. The circulating infusion system 301 includes two liquid pumps 3011, and the output ends of the two liquid pumps 3011 are respectively connected to the static pressure chambers 3041 of the two spray bodies 302 through pipes 3012 (e.g., Figure 3 As shown, the control system is electrically connected to the pressure sensor 311 and the liquid pump 3011, and is used to adjust the power of the corresponding liquid pump 3011 according to the detection result of the pressure sensor 311 to ensure that the pressure of the static pressure chamber 3041 is constant. That is, each spray body 302 is supplied with liquid by a single liquid pump 3011, and the pickling liquid transfer process between the two spray bodies 302 does not affect each other. Since the oxidation degree of the upper and lower surfaces of the silicon steel strip is not the same, the opening degree of each nozzle 303 of the two spray bodies 302 is different during operation. The change in the opening degree of the nozzle 303 affects the pressure control of the static pressure chamber 3041. By setting the liquid supply process of the two spray bodies 302 to be independent of each other, the pressure of the static pressure chamber 3041 of each spray body 302 is only affected by the change in the opening degree of its own nozzle 303, thereby reducing the difficulty of constant pressure control of the static pressure chamber 3041. Furthermore, by using a pressure sensor 311 to detect the pressure of the static pressure chamber 3041 in real time as a feedback signal to control the operation of the liquid pump 3011, it is more beneficial to accurately control the pressure of the static pressure chamber 3041 and stabilize it at the required constant pressure (the magnitude of which can be set according to actual needs). It should be noted that... Figure 3 In the pickling tank 4, two liquid pumps 3011 and corresponding pipes 3012 are respectively installed on the left and right sides. Figure 3Due to the limited perspective, only one liquid pump 3011 and its corresponding pipe 3012 are shown in the figure.

[0042] The number and specific distribution of pressure sensors 311 installed in each static pressure chamber 3041 can be set according to actual needs, and are not limited here.

[0043] Furthermore, see Figure 3 The pipe 3012 between the output end of the liquid pump 3011 and the static pressure chamber 3041 includes a first main pipe, a second main pipe, and multiple branch pipes. One end of the first main pipe is connected to the output end of the liquid pump 3011, and the other end is connected to the second main pipe. Multiple branch pipes are connected to the second main pipe and are connected to the static pressure chamber 3041 through these branch pipes. The multiple branch pipes on the second main pipe are evenly arranged along the axial direction of the second main pipe. Through the structure of the pipe 3012, the liquid flow input to the static pressure chamber 3041 can be dispersed, further reducing the generation of turbulence in the static pressure chamber 3041 and further improving the pressure control accuracy of the static pressure chamber 3041.

[0044] In some preferred embodiments, see Figure 4 The spray body 302 also includes a protective cover 312 that covers the housing 305. The protective cover 312 is connected to the housing 305 to form a sealed protective cavity 313, and the drive assembly 309 of the flow regulating mechanism 306 is located inside the sealed protective cavity 313. This prevents pickling liquid from flowing into the drive assembly 309 and damaging it, thus improving its service life.

[0045] The protective cover 312 can be connected to the housing 305 by screws or other detachable connection methods for easy disassembly and maintenance. Preferably, a sealing gasket 314 is provided between the protective cover 312 and the housing 305 (e.g., ...). Figure 4 (as shown), to ensure the sealing performance of the protective cavity 313.

[0046] In some implementations, see Figure 1 , Figure 5The detection device 5 includes two laser sensor groups, each comprising multiple laser sensors 501 evenly arranged in the left-right direction. The laser sensors 501 in both groups are used to detect the laser reflection intensity on the upper and lower surfaces of the silicon steel strip and transmit the data to the control system. The control system identifies the oxidation degree of the silicon steel strip surface based on the laser reflection intensity. Each laser sensor 501 includes a transmitting unit and a receiving unit. The transmitting unit emits laser light onto the silicon steel strip surface, and the receiving unit detects the intensity of the laser light reflected from the silicon steel strip surface (i.e., laser reflection intensity). The laser reflection intensity corresponding to different oxidation degrees of the silicon steel strip surface can be pre-calibrated experimentally to form pre-calibration data. The corresponding oxidation degree can then be retrieved from the pre-calibration data based on the real-time detected laser reflection intensity. Since each laser sensor 501 detects the laser reflection intensity at the laser irradiation point, the detection device 5 directly measures the oxidation degree of multiple discrete points evenly arranged in the left-right direction. The oxidation degree at positions between these discrete points can be calculated using interpolation or fitting operations based on the oxidation degree of these discrete points. Using this detection device 5 to detect the degree of oxidation requires less data processing and has high data processing efficiency, which can improve the efficiency of oxidation degree detection.

[0047] In some implementations, see Figure 2 , Figure 6 The detection device 5 includes two cameras 502 ( Figure 6 The system includes an upper-middle camera 502 (which is obscured and cannot be seen), two light strips 503, and two condenser reflectors 504. The light strips 503 extend in the left-right direction, and the two condenser reflectors 504 reflect the light emitted by the two light strips 503 onto the upper and lower surfaces of the silicon steel strip, forming an illumination strip extending in the left-right direction. The two cameras 502 respectively capture images of the upper and lower surfaces of the silicon steel strip, including the illumination strip, and send them to the control system. The control system identifies the degree of oxidation on the surface of the silicon steel strip based on the images. By using the light strips 503 for illumination, the details of the silicon steel strip surface can be displayed more clearly in the images, and the interference of external light on the detection results can be reduced. By using the condenser reflectors 504, the light can be focused, making the light intensity within the illumination strip greater, which is more conducive to improving the image clarity within the illumination strip and further reducing the interference of external light on the detection results of the area within the illumination strip. In addition, when performing image recognition, the control system can segment the image of the illumination strip from the image and only identify the degree of oxidation of the segmented image of the illumination strip. This can improve detection accuracy and reduce data processing volume, thereby improving detection efficiency. The oxidation level can be identified using existing image recognition methods, which will not be detailed here.

[0048] Furthermore, the detection device 5 also includes a fixing bracket 505, which is used to support and fix other equipment in the detection device 5 (such as laser sensor 501, camera 502, light strip 503, focusing reflector 504, etc.).

[0049] In this embodiment, each transfer roller group 2 includes an active roller 201 driven by a drive motor and a driven pressure roller 202 disposed above the active roller 201. Preferably, the vertical position of the driven pressure roller 202 is adjustable to suit silicon steel strips of different thicknesses.

[0050] Furthermore, at least one drive roller 201 is connected to a rotary encoder 6 to detect the actual moving speed of the silicon steel strip (the actual moving speed of the silicon steel strip can be calculated based on the rotational speed measured in real time by the rotary encoder 6 and the radius of the drive roller 201); the rotary encoder 6 and the drive motor are both electrically connected to the control system. The actual moving speed of the silicon steel strip measured by the rotary encoder 6 serves as a feedback signal for the control system to control the rotational speed of the drive motor, which can accurately stabilize the actual moving speed of the silicon steel strip at the required constant speed.

[0051] In this configuration, all drive rollers 201 can be synchronously driven by a single drive motor. In this case, a rotary encoder 6 can be connected to only one drive roller 201 or multiple drive rollers 201. Alternatively, each drive roller 201 can be driven by its own drive motor, in which case a rotary encoder 6 needs to be connected to each drive roller 201.

[0052] refer to Figure 7 This application provides a control method for a silicon steel strip pickling device as described above, applied to the control system of a silicon steel strip pickling device, including the following steps: A1. Obtain the constant speed of the silicon steel strip moving at a constant speed (this is a preset parameter, which can be set according to actual needs); A2. The oxidation degree at different detection points on the upper and lower surfaces of the silicon steel strip is detected by the detection device 5; each detection point is aligned with a row of nozzles 303 in the left-right direction; A3. Based on the constant speed and the degree of oxidation at each detection point, a reference flow rate adjustment scheme for each column of nozzles 303 is matched from the preset adjustment scheme database; the reference flow rate adjustment scheme includes the reference flow rate that each nozzle 303 in a corresponding column needs to achieve when aligned with the corresponding detection point; A4. Adjust the flow rate of each nozzle 303 according to the constant speed and reference flow rate adjustment scheme.

[0053] The detection point is the point on the detection position of the detection device 5 that is aligned with a row of nozzles 303 in the left-right direction. Assuming that the detection position of the detection device 5 is the position with X coordinate x1 and the Y coordinate of a row of nozzles 303 is y1, then the detection point is the point on the surface of the silicon steel strip located at coordinate (x1, y1) at the detection time of the detection device 5.

[0054] for Figure 1 In the silicon steel strip pickling apparatus shown, in step A2, the oxidation degree of multiple discrete points is directly measured by the detection device 5. Since the position of each discrete point is known (the position of the laser sensor 501 is fixed and known, so the position of the discrete point is fixed and known), and the position of each column of nozzles 303 is also known, in step A2, the oxidation degree of each detection point can be calculated by interpolation or fitting operation based on the position of each discrete point (mainly using the Y coordinate), the position of each column of nozzles 303 (mainly using the Y coordinate), and the oxidation degree of each discrete point.

[0055] for Figure 2 In the silicon steel strip pickling apparatus shown, in step A2, a photograph of the silicon steel strip surface including the illumination strip is first acquired by the detection device 5. Then, the image of the illumination strip is segmented from the photograph, and the image of the illumination strip is divided into multiple segmented regions corresponding one-to-one with the position of each column of nozzles 303 according to the position of each column of nozzles 303 (for example, the image of the illumination strip is segmented by multiple dividing lines parallel to the X-axis, so that the Y coordinate of the center point of each segmented region is the same as the Y coordinate of the corresponding column of nozzles 303). Then, the oxidation degree corresponding to each pixel in each segmented region is identified by an image recognition method (existing technology can be used, which will not be described in detail here). Finally, the oxidation degree of the corresponding detection point is calculated based on the oxidation degree of each pixel in each segmented region (for example, the average oxidation degree of all pixels in the same segmented region is calculated as the oxidation degree of the detection point corresponding to the column of nozzles 303 in that segmented region, but not limited to this).

[0056] The adjustment scheme database records standard flow adjustment schemes for multiple reference silicon steel strip moving speeds and for multiple reference oxidation degrees at the detection points. Each standard flow adjustment scheme includes the reference flow rate required when each nozzle 303 in a corresponding column is aligned with its corresponding detection point (i.e., when the detection point moves to a position directly opposite each nozzle 303). At this reference flow rate, the oxide layer at the detection point is just completely removed (i.e., the pickling degree is neither too high nor too low). The standard flow adjustment schemes for each reference silicon steel strip moving speed and each reference oxidation degree can be obtained experimentally. Therefore, in step A3, the similarity between the first array (composed of the reference oxidation degree and the reference silicon steel strip moving speed) and multiple second arrays (composed of the oxidation degree and constant speed at each detection point) corresponding to each standard flow adjustment scheme can be calculated. Then, the standard flow adjustment scheme corresponding to the maximum value of the similarity among the similarities for each detection point is selected as the reference flow adjustment scheme for that detection point.

[0057] Furthermore, the regulation scheme database records the reference oxidation degree corresponding to the reference flow regulation scheme; Step A4 includes: A401. Based on the constant speed and the front-to-back distance between the detection device 5 and each nozzle 303, calculate the delay time between each detection point and each nozzle 303 in the corresponding column; A402. Based on the oxidation degree of each detection point and the corresponding reference flow rate adjustment scheme and the corresponding reference oxidation degree, determine the target flow rate adjustment scheme for each column of nozzles 303; the target flow rate adjustment scheme includes the target flow rate that each nozzle 303 in a corresponding column needs to achieve when aligned with the corresponding detection point; A403. Adjust the flow rate of each nozzle 303 according to the delay time and target flow rate adjustment scheme corresponding to each detection point.

[0058] The front-to-back distance between the detection device 5 and each nozzle 303 (this distance is actually the front-to-back distance between the detection position of the detection device 5 and each nozzle 303) can be pre-calibrated. In step A401, the front-to-back distance between the detection device 5 and each nozzle 303 is divided by the constant speed to obtain the delay time between each detection point and each nozzle 303 in the corresponding column. This delay time refers to the time interval between the moment when the detection device 5 detects the oxidation degree of the detection point and the moment when the detection point reaches the position directly opposite the corresponding nozzle 303.

[0059] In step A402, the oxidation degree of the detection point can be divided by the reference oxidation degree of the reference flow adjustment scheme of the detection point to obtain the adjustment coefficient. Then, the reference flow rate corresponding to each nozzle 303 in the reference flow adjustment scheme of the detection point is multiplied by the adjustment coefficient to obtain the target flow rate corresponding to each nozzle 303, thus forming the target flow adjustment scheme.

[0060] In step A403, starting from the moment the detection point is detected by the detection device 5, the flow rate of each nozzle 303 in the corresponding column is delayed to reach the corresponding target flow rate based on the delay time between the detection point and each nozzle 303 in the corresponding column. For example, if a detection point is detected by the detection device 5 at time t, and the delay times between each nozzle 303 in the corresponding column are Δt1, Δt2, Δt3...Δtn, then the first nozzle 303 in the corresponding column reaches the corresponding target flow rate at time t+Δt1, the second nozzle 303 reaches the corresponding target flow rate at time t+Δt2, the third nozzle 303 reaches the corresponding target flow rate at time t+Δt3, and so on.

[0061] In this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, without necessarily requiring or implying any such actual relationship or order between these entities or operations.

[0062] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A pickling device for silicon steel strip, comprising a control system and a machine base (1), wherein the top of the machine base (1) is provided with a plurality of transfer roller groups (2), a spraying device (3) and a pickling tank (4), and the machine base (1) is provided with a pickling solution storage tank for storing pickling solution, characterized in that, It also includes a detection device (5) installed in front of the pickling tank (4), the detection device (5) being used to detect the degree of oxidation at different positions on the upper and lower surfaces of the silicon steel strip; The transfer roller group (2) is used to drive the silicon steel belt through the pickling tank (4) continuously at a constant speed. The spraying device (3) includes a circulating liquid delivery system (301) and two spray bodies (302) arranged in the pickling tank (4) and facing each other vertically. There is a gap between the two spray bodies (302) for the silicon steel strip to pass through. Multiple spray holes (303) are arranged in a matrix on the opposite sides of the two spray bodies (302). The rows of the matrix are parallel to the left and right directions, and the columns are parallel to the front and back directions. The circulating liquid delivery system (301) is used to draw pickling liquid from the pickling liquid storage tank and transport it to the spray body (302) so that the pickling liquid is sprayed out from the spray holes (303) to pickle the silicon steel strip. The flow rate of each of the nozzles (303) in the spray body (302) is independently adjustable; The control system is electrically connected to the spraying device (3) and the detection device (5), and is used to control the flow rate of each of the spray holes (303) according to the constant speed and the detection result of the detection device (5), so that the amount of pickling liquid sprayed at each of the upper and lower surfaces of the silicon steel strip matches the degree of oxidation of each of them. The spray body (302) includes a housing (305) with an inner cavity (304) and a plurality of flow regulating mechanisms (306). The housing (305) has spray holes (303) on its side facing another spray body (302). The spray holes (303) and the flow regulating mechanisms (306) are arranged in a one-to-one correspondence. The inner cavity (304) is connected to the circulating infusion system (301). The flow regulating mechanism (306) is used to independently adjust the opening of the corresponding spray hole (303), thereby independently adjusting the flow rate of the corresponding spray hole (303). The flow regulating mechanism (306) includes a valve core (307), a valve stem (308), and a drive assembly (309); the valve stem (308) is slidably and sealingly connected to the housing (305), the first end of the valve stem (308) extends into the inner cavity (304) and is fixedly connected to the valve core (307), and the second end extends out of the housing (305) and is drivenly connected to the drive assembly (309); the drive assembly (309) is used to drive the valve stem (308) to reciprocate axially, thereby driving the valve core (307) away from or closer to the corresponding nozzle (303) to adjust the opening degree of the corresponding nozzle (303); A flow equalization baffle (310) is provided in the inner cavity (304) of the housing (305). The flow equalization baffle (310) divides the inner cavity (304) into a static pressure chamber (3041) and a flow distribution chamber (3042). A plurality of flow equalization holes are evenly opened on the flow equalization baffle (310) to connect the static pressure chamber (3041) and the flow distribution chamber (3042). The spray hole (303) is connected to the flow distribution chamber (3042). The static pressure chamber (3041) is connected to the circulating infusion system (301).

2. The pickling apparatus for silicon steel strip according to claim 1, characterized in that, The drive assembly (309) includes an abutment plate (3091), a return spring (3092), a cam (3093), and a motor (3094). The abutment plate (3091) is fixedly connected to the second end of the valve stem (308). The cam (3093) is connected to the output shaft of the motor (3094), and the circumferential surface of the cam (3093) abuts against the abutment plate (3091). The return spring (3092) is used to press the abutment plate (3091) against the circumferential surface of the cam (3093). The motor (3094) is used to drive the cam (3093) to rotate and, with the cooperation of the return spring (3092), drive the abutment plate (3091) to reciprocate.

3. The pickling apparatus for silicon steel strip according to claim 1, characterized in that, Each of the spray bodies (302) is equipped with a pressure sensor (311) in its static pressure chamber (3041). The circulating infusion system (301) includes two liquid pumps (3011). The output ends of the two liquid pumps (3011) are respectively connected to the static pressure chambers (3041) of the two spray bodies (302) through pipes (3012). The control system is electrically connected to the pressure sensor (311) and the liquid pump (3011) and is used to adjust the power of the corresponding liquid pump (3011) according to the detection result of the pressure sensor (311) to ensure that the pressure of the static pressure chamber (3041) is constant.

4. The pickling apparatus for silicon steel strip according to claim 1, characterized in that, The detection device (5) includes two laser sensor groups. Each laser sensor group includes multiple laser sensors (501) evenly arranged in the left-right direction. The laser sensors (501) of the two laser sensor groups are used to detect the laser reflection intensity of the upper and lower surfaces of the silicon steel strip and send it to the control system. The control system identifies the oxidation degree of the silicon steel strip surface based on the laser reflection intensity.

5. The pickling apparatus for silicon steel strip according to claim 1, characterized in that, The detection device (5) includes two cameras (502), two light strips (503), and two condenser reflectors (504). The light strips (503) extend in the left-right direction. The two condenser reflectors (504) are respectively used to reflect the light emitted by the two light strips (503) onto the upper and lower surfaces of the silicon steel strip to form an illumination strip extending in the left-right direction. The two cameras (502) are respectively used to take pictures of the upper and lower surfaces of the silicon steel strip containing the illumination strip and send them to the control system. The control system identifies the degree of oxidation on the surface of the silicon steel strip based on the pictures.

6. A control method for a silicon steel strip pickling apparatus as described in any one of claims 1-5, characterized in that, The control system applied to the silicon steel strip pickling device includes the following steps: A1. Obtain the constant speed of the silicon steel strip moving at a constant speed; A2. The oxidation degree at different detection points on the upper and lower surfaces of the silicon steel strip is detected by the detection device (5); each detection point is aligned with a row of nozzles (303) in the left-right direction. A3. Based on the constant speed and the oxidation degree of each detection point, a reference flow rate adjustment scheme for each column of nozzles (303) is matched from a preset adjustment scheme database; the reference flow rate adjustment scheme includes the reference flow rate that each nozzle (303) in a corresponding column needs to achieve when aligned with the corresponding detection point; A4. Adjust the flow rate of each of the nozzles (303) according to the constant speed and the reference flow rate adjustment scheme.

7. The control method according to claim 6, characterized in that, The adjustment scheme database records the reference oxidation degree corresponding to the reference flow adjustment scheme; Step A4 includes: A401. Based on the constant speed and the front-to-back distance between the detection device (5) and each of the nozzles (303), calculate the delay time between each detection point and each nozzle (303) in the corresponding column; A402. Based on the oxidation degree of each detection point and the corresponding reference flow rate adjustment scheme and the corresponding reference oxidation degree, determine the target flow rate adjustment scheme for each column of nozzles (303); the target flow rate adjustment scheme includes the target flow rate that each nozzle (303) in a corresponding column needs to achieve when aligned with the corresponding detection point; A403. Adjust the flow rate of each nozzle (303) according to the delay time corresponding to each detection point and the corresponding target flow rate adjustment scheme.

Images