Roller scale control method and device

Abstract

The invention discloses a roller way scale control method, relates to the technical field of electrical automation control, and solves the technical problems of low working efficiency, low accuracy, no weight early warning function and no automatic return-to-zero operation of manual recording of an existing roller way scale. The method comprises the following steps of: 1, acquiring a steel signal on a weighing roller way, judging whether the steel signal is a true value or not, and when the steel signal is the true value, controlling the weighing roller way to stop according to set positioning delay time, so that a raw material blank is parked right above a roller way scale; and 2, the weighing roller way is controlled to stop acting according to the set locking time, and the roller way scale is controlled to weigh the raw material blank. The invention further discloses a roller way scale control device. According to the invention, the problem of low efficiency during manual copying is solved, the equipment is ensured to be in a zero state before each raw steel billet is weighed, the static error is reduced, and the problem of low timeliness is solved.

Description

Technical Field

[0001] The invention relates to the technical field of electrical automation control, and more specifically, to a roller scale control method and device. Background Art

[0002] The roller scale of the heating furnace in the steel rolling mill is used to collect the weight data of the raw material billet. It consists of a scale frame, a sensor, and a control box. The weight information is displayed on the control box, and the weight signal can be output by the 4-24mA analog output of the control box. The acquisition of weight data is generally achieved through two ways: manual transcription on the control box display and PLC processing of the weight analog signal acquisition program and reading on the operation screen. When the weighing equipment needs to be reset to zero, press the reset button on the control box to complete the operation.

[0003] Shortcomings of current technology:

[0004] 1. Weight data is manually transcribed, the low degree of automation wastes labor resources and the work efficiency is low;

[0005] 2. The 4-24mA analog signal acquisition method is susceptible to interference on site, resulting in large fluctuations in weight data and low accuracy;

[0006] 3. Manually perform zeroing operation on the operation box, and then manually operate on the equipment after finding that the weighing data is inaccurate. There is a certain time difference between manual discovery of errors and operation, and the weighing equipment is not adjusted in time, so the timeliness is low;

[0007] 4. When the weight of the raw material is too heavy or too light, there is no early warning function to remind the staff to adjust the raw material. Summary of the invention

[0008] The technical problem to be solved by the present invention is to provide a roller scale control method and device in view of the deficiencies in the prior art, so as to solve the technical problems of low efficiency, low accuracy, no weight warning function and no automatic zeroing operation of the existing roller scale manual transcription.

[0009] The roller scale control method described in the present invention comprises:

[0010] Step 1: obtaining a steel signal on the weighing roller, determining whether the steel signal is true, and when the steel signal is true, controlling the weighing roller to stop according to a set positioning delay time, so that the raw material blank is parked directly above the roller scale;

[0011] Step 2: Control the weighing roller to stop moving according to the set locking time, control the roller scale to weigh the raw material, and after the locking time ends, the weighing roller continues to run;

[0012] Step three: Obtain the zeroing signal of the roller scale, determine whether the zeroing signal is a true value, when the zeroing signal is a true value, zero the roller scale, when the zeroing signal is a false value, do not zero the roller scale.

[0013] As a further improvement, in step 1, the method for controlling the weighing roller to stop according to the set positioning delay time is to obtain the position of the roller scale and the initial position of the raw material billet triggering the steel signal, and to obtain the starting distance s between the roller scale and the raw material billet by subtracting the position of the roller scale and the initial position of the raw material billet triggering the steel signal;

[0014] The initial speed v0 of the raw material billet when the steel signal is triggered is obtained, and the speed when the raw material billet reaches the roller scale is set to zero. The acceleration a of the raw material billet is calculated according to the initial speed v0 when the steel signal is triggered, the speed v1 when the raw material billet reaches the roller scale, and the starting distance. Then, the positioning delay time t1 is calculated according to the acceleration a of the raw material billet, the initial speed v0 when the steel signal is triggered, and the speed v1 when the raw material billet reaches the roller scale.

[0015] Furthermore, the acceleration expression of the raw material billet is calculated based on the initial speed of the raw material billet when the steel signal is triggered, the speed of the raw material billet when it reaches the roller scale, and the starting distance:

[0016]

[0017] Among them, a is the acceleration of the raw material billet, s is the starting distance between the roller scale and the raw material billet, v0 is the initial speed of the raw material billet when the steel signal is triggered, and v1 is the speed of the raw material billet when it reaches the roller scale.

[0018] Furthermore, the expression of the positioning delay time t1 is calculated based on the acceleration a of the raw material billet, the initial speed v0 of the raw material billet when the steel signal is triggered, and the speed v1 of the raw material billet when it reaches the roller scale:

[0019]

[0020] Among them, t1 is the positioning delay time, a is the acceleration of the raw material billet, v0 is the initial speed of the raw material billet when the steel signal is triggered, and v1 is the speed of the raw material billet when it reaches the roller scale.

[0021] Furthermore, in step 2, when the weight of the raw material blank is greater than the maximum value of the set raw material blank weight standard range, a first warning is issued; when the weight of the raw material blank is less than the minimum value of the raw material blank weight standard range, a second warning is issued; when the weight of the raw material blank is within the raw material blank weight standard range, no warning is issued.

[0022] Furthermore, the roller scale inputs the weight data signal of the raw material blank into the controller.

[0023] A roller scale control device, comprising:

[0024] A grating switch sensor, which includes a transmitting laser source and a receiver, wherein the transmitting laser source and the receiver are respectively installed on both sides of the head of the weighing roller table to obtain a steel signal;

[0025] The raw material blank positioning grating sensor is installed on the scale frame of the roller scale to obtain the zeroing signal;

[0026] The controller uses the control method as described above to control the weighing roller and the roller scale according to the steel signal and the zeroing signal.

[0027] As a further improvement, the controller is a PLC, and the model of the PLC is Siemens 1500.

[0028] Beneficial Effects

[0029] The advantages of the present invention are:

[0030] The invention controls the weighing roller by acquiring a steel signal and a zeroing signal, automatically places the raw material billet on the roller scale for weighing, and directly inputs the weighing data into the PLC, thereby solving the problem of low efficiency during manual transcription; by giving an early warning to the raw material billet that is not within the set weighing range, the staff can be reminded to make adjustments in time; by acquiring the zeroing signal, the roller scale is automatically zeroed, and the weighing equipment is zeroed after each raw material billet passes the steel, thereby ensuring that the equipment is in a zeroed state before weighing each raw material billet, thereby reducing static errors and solving the problem of low timeliness. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a flow chart of the control method of the present invention. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the embodiments, but it does not constitute any limitation to the present invention. Any limited number of modifications made by anyone within the scope of the claims of the present invention are still within the scope of the claims of the present invention.

[0033] See also Figure 1 A roller scale control method of the present invention is as follows:

[0034] Step 1: Get the steel signal on the weighing roller and determine whether the steel signal is true. When the steel signal is true, control the weighing roller to stop according to the set positioning delay time, so that the raw material billet is parked directly above the roller scale, and the roller scale weighs the raw material billet; when the steel signal is false, the weighing roller continues to run.

[0035] In step one, the method for controlling the weighing roller to stop according to the set positioning delay time is to obtain the position of the roller scale and the initial position of the raw material billet triggering the steel signal, and to subtract the position of the roller scale from the initial position of the raw material billet triggering the steel signal to obtain the starting distance s between the roller scale and the raw material billet.

[0036] Get the initial speed v0 of the raw material billet when the steel signal is triggered, set the speed of the raw material billet when it reaches the roller scale to zero, calculate the acceleration a of the raw material billet according to the initial speed v0 when the steel signal is triggered, the speed v1 when the raw material billet reaches the roller scale and the starting distance, and then calculate the positioning delay time t1 according to the acceleration a of the raw material billet, the initial speed v0 when the steel signal is triggered and the speed v1 when the raw material billet reaches the roller scale.

[0037] The acceleration expression of the raw material billet is calculated based on the initial speed of the raw material billet when the steel signal is triggered, the speed of the raw material billet when it reaches the roller scale, and the starting distance:

[0038]

[0039] Among them, a is the acceleration of the raw material billet, s is the starting distance between the roller scale and the raw material billet, v0 is the initial speed of the raw material billet when the steel signal is triggered, and v1 is the speed of the raw material billet when it reaches the roller scale.

[0040] The expression of the positioning delay time t1 is calculated based on the acceleration a of the raw material billet, the initial speed v0 of the raw material billet when the steel signal is triggered, and the speed v1 of the raw material billet when it reaches the roller scale:

[0041]

[0042] Among them, t1 is the positioning delay time, a is the acceleration of the raw material billet, v0 is the initial speed of the raw material billet when the steel signal is triggered, and v1 is the speed of the raw material billet when it reaches the roller scale.

[0043] Step 2: Control the weighing roller to stop according to the set locking time, and keep the weighing frame in a stable stopped state so that the sensor in the weighing device is evenly stressed, reducing the dynamic error of the weighing equipment. The roller is controlled to weigh the raw material, and after the locking time is over, the weighing roller continues to run. The locking time in this embodiment is 5s.

[0044] In step 2, when the weight of the raw material blank is greater than the maximum value of the set raw material blank weight standard range, a first warning is issued; when the weight of the raw material blank is less than the minimum value of the raw material blank weight standard range, a second warning is issued; when the weight of the raw material blank is within the raw material blank weight standard range, no warning is issued, thereby reminding the staff to adjust the raw material blank.

[0045] Step 3: Get the zeroing signal of the roller scale and determine whether the zeroing signal is true. When the zeroing signal is true, the roller scale is zeroed. When the zeroing signal is false, the roller scale is not zeroed. Ensure that the roller scale is in the zeroing state before weighing each raw steel billet to reduce static errors.

[0046] A roller scale control device, comprising:

[0047] A roller scale in front of a heating furnace in a steel rolling mill is installed in front of the heating furnace to collect weight data of the raw material billet before loading into the furnace. The roller scale is installed directly below the weighing roller and consists of a scale frame, a sensor, and a control box. To ensure accurate weighing data, the raw material billet to be measured needs to be pressed directly above the scale frame so that the sensor in the roller scale is evenly stressed.

[0048] The grating switch sensor includes a laser source and a receiver. The laser source and the receiver are installed on both sides of the weighing roller table 1 meter in front of the head, respectively, to obtain the steel signal. After the steel signal is detected, the positioning command delay timer is triggered to start timing. The positioning signal is generated to control the weighing roller table to stop, so that the raw material billet is parked directly above the roller table weighing frame. The receiver receives the light source and outputs a false value to the controller, otherwise it outputs a true value to the controller.

[0049] The raw material blank positioning grating sensor is installed on the weighing frame of the roller scale to obtain the zeroing signal. After each raw material blank passes through the steel, a certain amount of iron oxide scale will be left on the weighing frame of the roller scale. The accumulated weight of the iron oxide scale on the weighing frame will make the weighing equipment unable to return to zero when there is no blank. The weighing weight will be too high when it is not returned to zero. Using the raw material blank positioning grating sensor, after the raw material blank positioning grating sensor detects the steel passing signal, the PLC processes and generates a zeroing signal. The zeroing signal drives one of the intermediate relays, and the normally open point of the intermediate relay is connected to the zeroing input terminal of the roller scale, completing the PLC automatic zeroing control of the weighing equipment, so that the roller scale is in the zeroing state before weighing each billet, reducing static errors.

[0050] Controller, the controller is PLC, the model of PLC is Siemens 1500. The system communication hardware is all profinet interface. The weighing device provides MODBUS protocol 485 export, and a new modbus to TCP gateway is added to build the communication link between PLC and weighing device. Through the gateway supporting application software to configure the gateway parameters, the Siemens PLC and the gateway communication program read the weighing data into the newly created dedicated global non-optimized storage block, and complete the PLC to read the weighing device data. Gateway: a transfer device with communication protocol conversion and corresponding port docking. Optimized storage block: Siemens PLC1500 series storage area attributes, the optimized attributes have poor compatibility, and the non-optimized attributes are generally selected for external communication.

[0051] The initial speed v0 of the raw material billet when the steel signal is triggered is obtained through the speed sensor. The speed sensor is installed on the outside of the weighing roller.

[0052] The controller applies the control method as mentioned above to control the weighing roller and roller scale according to the steel signal and the zeroing signal.

[0053] For the roller scale data reading function, the roller scale data is in the ASCALL code message format, and the original data read by the PLC needs to be converted from the ASCALL code to real numbers. The data format conversion function needs to be completed in three steps:

[0054] Step 1: Data legitimacy judgment: Set the legal data range to generate upper and lower limit reference marks, compare each group of newly collected data sources with the reference marks, and eliminate data that exceeds the range.

[0055] Step 2, data decomposition and conversion: after screening in step 1, the legal data group is reversely decomposed according to the ASCALL code format, and the valid values ​​are converted into real numbers and transferred to specific storage units.

[0056] Sub-step 3, data combination: obtain the decomposed and converted values ​​in sub-step 2, multiply these values ​​by the corresponding weights to obtain products, and then add up the products to combine into a decimal value.

[0057] Product: The value obtained from the decomposition of the message is an unweighted value. For example, the hundreds digit is 6, and the product is 6*100, which is 600. The thousands digit is 4, and the product is 4*1000, which is 4000. The tens digit and the ones digit are 0, so the final value is 4000+600+0+0=4600.

[0058] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A roller scale control method, characterized in that: The method is, Step 1: obtaining a steel signal on the weighing roller, determining whether the steel signal is true, and when the steel signal is true, controlling the weighing roller to stop according to a set positioning delay time, so that the raw material blank is parked directly above the roller scale; Step 2: Control the weighing roller to stop moving according to the set locking time, control the roller scale to weigh the raw material, and after the locking time ends, the weighing roller continues to run; Step three: Obtain the zeroing signal of the roller scale, determine whether the zeroing signal is a true value, when the zeroing signal is a true value, zero the roller scale, when the zeroing signal is a false value, do not zero the roller scale.

2. A roller scale control method according to claim 1, characterized in that: In step 1, the method for controlling the weighing roller to stop according to the set positioning delay time is to obtain the position of the roller scale and the initial position of the raw material blank triggering the steel signal, and to obtain the starting distance s between the roller scale and the raw material blank by subtracting the position of the roller scale and the initial position of the raw material blank triggering the steel signal; The initial speed v0 of the raw material billet when the steel signal is triggered is obtained, the speed of the raw material billet when it reaches the roller scale is set to zero, and the acceleration a of the raw material billet is calculated according to the initial speed v0 when the steel signal is triggered, the speed v1 when the raw material billet reaches the roller scale and the starting distance, and then the positioning delay time t1 is calculated according to the acceleration a of the raw material billet, the initial speed v0 when the steel signal is triggered and the speed v1 when the raw material billet reaches the roller scale.

3. A roller scale control method according to claim 2, characterized in that: The acceleration expression of the raw material billet is calculated based on the initial speed of the raw material billet when the steel signal is triggered, the speed of the raw material billet when it reaches the roller scale, and the starting distance: Among them, a is the acceleration of the raw material billet, s is the starting distance between the roller scale and the raw material billet, v0 is the initial speed of the raw material billet when the steel signal is triggered, and v1 is the speed of the raw material billet when it reaches the roller scale.

4. A roller scale control method according to claim 3, characterized in that: The expression of the positioning delay time t1 is calculated based on the acceleration a of the raw material billet, the initial speed v0 of the raw material billet when the steel signal is triggered, and the speed v1 of the raw material billet when it reaches the roller scale: Among them, t1 is the positioning delay time, a is the acceleration of the raw material billet, v0 is the initial speed of the raw material billet when the steel signal is triggered, and v1 is the speed of the raw material billet when it reaches the roller scale.

5. A roller scale control method according to claim 1, characterized in that: In step 2, when the weight of the raw material blank is greater than the maximum value of the set raw material blank weight standard range, a first warning is issued; when the weight of the raw material blank is less than the minimum value of the raw material blank weight standard range, a second warning is issued; when the weight of the raw material blank is within the raw material blank weight standard range, no warning is issued.

6. A roller scale control method according to claim 1, characterized in that: The roller scale inputs the weight data signal of the raw material blank into the controller.

7. A roller scale control device, characterized in that: It includes, A grating switch sensor, which includes a transmitting laser source and a receiver, wherein the transmitting laser source and the receiver are respectively installed on both sides of the head of the weighing roller table to obtain a steel signal; The raw material blank positioning grating sensor is installed on the scale frame of the roller scale to obtain the zeroing signal; The controller uses the control method as described in claims 1 to 6 to control the weighing roller and roller scale according to the steel signal and the zeroing signal.

8. A roller scale control device according to claim 7, characterized in that: The controller is a PLC, and the model of the PLC is Siemens 1500.

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