CN113245385B - Control system and method for wire drawing machine - Google Patents
Control system and method for wire drawing machine Download PDFInfo
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- CN113245385B CN113245385B CN202110437110.4A CN202110437110A CN113245385B CN 113245385 B CN113245385 B CN 113245385B CN 202110437110 A CN202110437110 A CN 202110437110A CN 113245385 B CN113245385 B CN 113245385B
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- wire drawing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/02—Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums
- B21C1/12—Regulating or controlling speed of drawing drums, e.g. to influence tension; Drives; Stop or relief mechanisms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
Abstract
The application provides a wire drawing machine control system and a method, wherein the system comprises a control device and a plurality of wire drawing units connected in series, each wire drawing unit is connected with the control device, and each wire drawing unit is provided with a diameter measuring unit for measuring the wire outlet diameter of the wire drawing unit and a speed measuring unit for measuring the running linear speed of a winding drum of the wire drawing unit, one end of the diameter measuring unit of the wire drawing unit is connected with the wire drawing unit, the other end of the diameter measuring unit is connected with the control device, and one end of the speed measuring unit of the wire drawing unit is connected with the wire drawing unit, and the other end of the speed measuring unit of the wire drawing unit is connected with the control device. In this application, operating personnel only need predetermine the linear velocity to the input of receipts line equipment, and controlling means alright confirm the given linear velocity of each wire drawing unit based on predetermineeing the linear velocity to and control each wire drawing unit and move with corresponding given linear velocity. The use of the wire drawing machine by operators can be simplified.
Description
Technical Field
The application belongs to the technical field of wire drawing machines, and particularly relates to a wire drawing machine control system and a method thereof.
Background
A Wire Drawing Machine, also known as a Wire Drawing Machine and a Wire Drawing Machine, has a british name of Wire Drawing Machine, is a mechanical device widely used in industrial applications, and is widely applied to industries such as mechanical manufacturing, hardware processing, petrochemical industry, plastics, bamboo and wood products, wires and cables and the like.
In the related art, an operator usually performs usage control on a wire drawing machine by compiling a control statement of a Programmable Logic Controller (PLC). The wire drawing machine is controlled by programming the control sentences, so that the wire drawing machine is difficult to use and is inconvenient for operators to use.
Disclosure of Invention
The application aims to provide a wire drawing machine control system and a wire drawing machine control method, and aims to solve the problems that in the related art, the wire drawing machine is controlled to be used in a programming control statement mode, the difficulty is high, and an operator cannot use the wire drawing machine conveniently.
The application provides a wire drawing machine control system, which comprises a control device and a plurality of wire drawing units connected in series, wherein each wire drawing unit is respectively connected with the control device,
the device comprises a control device, a wire drawing unit, a diameter measuring unit, a speed measuring unit and a control device, wherein the control device is used for controlling the running linear speed of a winding drum of the wire drawing unit;
control means for
Receiving a set linear speed input by a user aiming at the last target wire drawing unit in a target wire drawing unit group, wherein the target wire drawing unit in the target wire drawing unit group is a wire drawing unit needing to operate, and the last target wire drawing unit is a wire drawing unit at a wire take-up end and is recorded as wire take-up equipment;
determining the given linear speed of each target wire drawing unit except the wire take-up device according to the set linear speed and the predetermined elongation of each target wire drawing unit;
and controlling the motor of the wire rewinding device to operate at a set linear speed, and controlling the motors of all target wire drawing units except the wire rewinding device to operate at a corresponding set linear speed so as to control the operation of the wire drawing machine.
In one embodiment, the control means is further adapted to:
when the threading operation is carried out, controlling each diameter measuring unit to detect the outgoing line diameter of the corresponding wire drawing unit to obtain the outgoing line diameter of each wire drawing unit, wherein for each wire drawing unit, if the outgoing line diameter of the wire drawing unit is empty, the non-empty outgoing line diameter before and nearest to the wire drawing unit is taken as the outgoing line diameter of the wire drawing unit; for each wire drawing unit, taking the ratio of the square of the outgoing line diameter of the previous wire drawing unit to the square of the outgoing line diameter of the wire drawing unit as the elongation of the wire drawing unit; and determining the wire drawing unit with the elongation rate larger than 1 as the wire drawing unit needing to be operated, and determining the wire drawing unit with the elongation rate equal to 1 as the wire drawing unit needing to be stopped.
In one embodiment, the control means is further for:
and when the motor runs, controlling each speed measuring unit to detect the linear speed of the corresponding wire drawing unit, and taking the detected linear speed as the rated linear speed of the wire drawing unit to obtain the rated linear speed of each wire drawing unit.
In one embodiment, the control means is further for:
and controlling a speed measuring unit of each target wire drawing unit to detect the real-time linear speed of the target wire drawing unit, and finely adjusting the operating frequency of a motor of the target wire drawing unit according to the difference value between the real-time linear speed of the target wire drawing unit and the given linear speed.
The application also provides a control method of the wire drawing machine, which is applied to the control system of the wire drawing machine, and the control method of the wire drawing machine comprises the following steps:
receiving a set linear speed input by a user aiming at the last target wire drawing unit in a target wire drawing unit group, wherein the target wire drawing unit in the target wire drawing unit group is a wire drawing unit needing to operate, and the last target wire drawing unit is a wire drawing unit at a wire take-up end and is recorded as wire take-up equipment;
determining the given linear velocity of each target wire drawing unit except the wire rewinding device according to the set linear velocity and the predetermined elongation of each target wire drawing unit;
and controlling the motor of the wire rewinding device to operate at a set linear speed, and controlling the motors of all target wire drawing units except the wire rewinding device to operate at corresponding set linear speeds so as to control the wire drawing machine to operate.
In one embodiment, determining the given linear velocity of each target wire drawing unit except the wire rewinding device according to the set linear velocity and the predetermined elongation of each target wire drawing unit comprises:
determining the ratio of the set linear speed to the predetermined total elongation as the given linear speed of the first target wire drawing unit in the target wire drawing unit group;
and determining the product of the elongation of the target wire drawing unit and the given linear velocity of the last target wire drawing unit as the given linear velocity of the target wire drawing unit aiming at the target wire drawing units except the first target wire drawing unit in the target wire drawing unit group.
In one embodiment, controlling the motor of each target drawing unit other than the wire take-up device to operate at a respective given linear velocity comprises: controlling each target wire drawing unit to operate at a corresponding given operating frequency, wherein the given operating frequency of the target wire drawing unit is calculated by the following formula:
F m ＝50×R m ÷V m
wherein, F m For a given operating frequency, R, of the m-th drawing unit of the drawing machine m Given linear velocity, V, of the m-th drawing unit of the drawing machine m Is the rated linear speed of the mth drawing unit of the drawing machine.
In one embodiment, the method of controlling a wire drawing machine further comprises:
and for each target wire drawing unit, controlling a speed measuring unit of the target wire drawing unit to detect the real-time linear speed of the target wire drawing unit, and finely adjusting the operating frequency of a motor of the target wire drawing unit according to the difference value between the real-time linear speed of the target wire drawing unit and the given linear speed.
In one embodiment, each wire drawing unit of the wire drawing machine has a first feedback coefficient for performing feedback adjustment on the wire drawing unit and a second feedback coefficient for performing feedback adjustment on the next wire drawing unit, and the fine adjustment of the operating frequency of the motor of the target wire drawing unit is performed according to the difference between the real-time linear velocity and the given linear velocity of the target wire drawing unit, and comprises the following steps:
and performing feedback adjustment on the target wire drawing unit according to the product of the difference and the first feedback coefficient, and performing feedback adjustment on the next target wire drawing unit of the target wire drawing unit according to the product of the difference and the second feedback coefficient.
In one embodiment, the sum of the first feedback coefficient and the second feedback coefficient is 1, and the first feedback coefficient is greater than the second feedback coefficient.
According to the control system and the control method for the wire drawing machine, an operator only needs to input the preset linear speed aiming at the wire rewinding device, the control device can determine the given linear speed of each wire drawing unit based on the preset linear speed, and each wire drawing unit is controlled to operate at the corresponding given linear speed. The use of the wire drawing machine by operators can be simplified. The working efficiency of wire drawing operation is improved.
Drawings
FIG. 1 is a schematic structural diagram of a wire drawing machine control system provided in an embodiment of the present application;
fig. 2 is a schematic flow chart of a control method of a wire drawing machine according to an embodiment of the present disclosure.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Example one
Referring to fig. 1, a schematic structural diagram of a control system of a wire drawing machine according to an embodiment of the present application is provided. As shown in fig. 1, the drawing machine control system may include a control device 10, a plurality of drawing units connected in series, each of which is connected to the control device 10, wherein,
the device comprises a wire drawing unit, a control device and a speed measuring unit, wherein the wire drawing unit is used for measuring the wire outlet diameter of the wire drawing unit, the speed measuring unit is used for measuring the running linear speed of a winding drum of the wire drawing unit, one end of the diameter measuring unit of the wire drawing unit is connected with the wire drawing unit, the other end of the diameter measuring unit of the wire drawing unit is connected with the control device, and one end of the speed measuring unit of the wire drawing unit is connected with the wire drawing unit, and the other end of the speed measuring unit of the wire drawing unit is connected with the control device. Wherein one wire drawing unit is provided with a winding drum which is used for drawing the metal wire. In practical application, the running linear speed of the winding drum of the wire drawing unit is the linear speed of the wire drawing unit. The above connection is generally referred to as a communicable connection.
In fig. 1, three drawing units are shown, a first drawing unit 21, a second drawing unit 22 and a third drawing unit 23. The diameter measuring unit of the first wire drawing unit 21 is a first diameter measuring unit 41, and the speed measuring unit of the first wire drawing unit 21 is a first speed measuring unit 31. The diameter measuring unit of the second wire drawing unit 22 is a second diameter measuring unit 42, and the speed measuring unit of the second wire drawing unit 22 is a second speed measuring unit 32. The diameter measuring unit of the third wire drawing unit 23 is a third diameter measuring unit 43, and the speed measuring unit of the third wire drawing unit 23 is a third speed measuring unit 33.
And the control device 10 is used for executing the following steps from one step to three so as to control the operation of the wire drawing machine.
It should be noted that the control device usually performs the following steps one to three after the installation and the threading work. In practical applications, the rated linear speed of each drawing unit can be measured when the drawing machine is installed and debugged. And generally, when the head threading operation is carried out on the wire drawing machine, the outlet diameter of each wire drawing unit can be measured, so that the elongation of each wire drawing unit can be calculated.
Step one, receiving a set linear speed input by a user aiming at the last target wire drawing unit in the target wire drawing unit group.
The target wire drawing unit in the target wire drawing unit group is a wire drawing unit needing to operate, and the last target wire drawing unit is a wire drawing unit at a wire winding end and is recorded as wire winding equipment.
It should be noted that, a wire drawing machine usually has a plurality of wire drawing units connected in sequence, the setting sequence of each wire drawing unit in the wire drawing machine is usually fixed, and from the inlet wire to the outlet wire direction, the sequence of each wire drawing unit is the 1 st wire drawing unit, the 2 nd wire drawing unit, the 3 rd wire drawing unit in turn, and so on. The last drawing unit is a drawing unit for taking up the wire, commonly called a wire take-up device. For example, if the drawing machine has 6 drawing units in total, wherein the 3 rd, 5 th and 6 th drawing units are drawing units that need to be operated, and the 1 st, 2 th and 4 th drawing units need to be deactivated, the target drawing units in the target drawing unit group have the 3 rd, 5 th and 6 th drawing units. At this time, the 3 rd drawing unit of the drawing machine is the first target drawing unit, the 5 th drawing unit of the drawing machine is the second target drawing unit, and the 6 th drawing unit of the drawing machine is the third target drawing unit.
Here, the control device 10 may be a PLC controller, a single chip microcomputer, or the like. A user, e.g. an operator operating a wire drawing machine, may input a set linear speed on a human-machine interface, e.g. a touch screen, for interacting with the control device 10. The set linear speed is typically the user desired outlet speed. The control means may receive the set linear velocity.
And step two, determining the given linear velocity of each target wire drawing unit except the wire rewinding device according to the set linear velocity and the predetermined elongation of each target wire drawing unit.
Wherein a given line speed is generally the desired line speed to be achieved.
The elongation of each wire drawing unit of the wire drawing machine can be calculated by the wire outlet diameter measured during threading operation. For each drawing unit, the elongation of the drawing unit is generally the ratio of the square of the outgoing line diameter of the previous drawing unit to the square of the outgoing line diameter of the drawing unit. The calculation formula of the elongation of the drawing unit may be as follows:
wherein r is m Elongation of the m-th drawing unit of the drawing machine, D m-1 Is the outlet diameter of the m-1 wire drawing unit of the wire drawing machine, D m Is the outlet diameter of the mth wire drawing unit of the wire drawing machine. It should be noted that the outlet diameter of the drawing unit generally refers to the diameter of the metal wire rod output by the drawing unit.
It should be noted that the total amount of metal passing through each wire drawing unit per unit time is kept consistent according to the principle that the volume flow rate of metal per second is equal. Therefore, the following relationship is required between the linear velocity and the outgoing line diameter of each drawing unit:
wherein D is m-1 Is the outlet diameter of the m-1 wire drawing unit of the wire drawing machine, D m Is the outlet diameter of the mth wire drawing unit of the wire drawing machine, D m+1 Is the outlet diameter R of the (m + 1) th wire drawing unit of the wire drawing machine m-1 Given line speed, R, of the m-1 st drawing unit of the drawing machine m Given linear speed, R, of the m-th drawing unit of the drawing machine m+1 Is the given linear speed of the m +1 th drawing unit of the drawing machine.
Here, the control device may calculate a given linear velocity and a given operating frequency for each target drawing unit using a predetermined elongation of each target drawing unit and a set linear velocity set by a user. Wherein the given operating frequency is generally the desired operating frequency.
As one implementation, the control device may determine the given linear velocity of the second to last target drawing unit based on the set velocity, then determine the given linear velocity of the third to last target drawing unit based on the given linear velocity of the second to last target drawing unit, and so on. Then, the given operating frequency of each target drawing unit may be determined based on the relationship between the given linear speed and the given operating frequency of each target drawing unit.
And step three, controlling the motor of the wire rewinding device to operate at a set linear speed, and controlling the motors of all target wire drawing units except the wire rewinding device to operate at a corresponding set linear speed so as to control the wire drawing machine to operate.
Here, after the desired linear velocity and the desired operating frequency of each target drawing unit are obtained, the control device may automatically control each target drawing unit to operate at the desired linear velocity and the desired operating frequency.
According to the system provided by the embodiment of the application, an operator only needs to input the preset linear speed aiming at the wire rewinding device, the control device can determine the given linear speed and the given operating frequency of each wire drawing unit based on the preset linear speed, and each wire drawing unit is controlled to operate at the corresponding given linear speed and the given operating frequency. The use of the wire drawing machine by operators can be simplified. In practice, the drawing unit operates at a given linear speed, also essentially at a given operating frequency.
In an optional implementation manner of each embodiment of the present application, the determining the given linear velocity of each target wire drawing unit except for the wire rewinding device according to the set linear velocity and the predetermined elongation of each target wire drawing unit may be implemented as follows:
first, the ratio of the set linear velocity to the predetermined total elongation is determined as the given linear velocity of the first target drawing unit in the target drawing unit group.
Here, the total elongation is generally a ratio of the square of the incoming wire diameter to the square of the outgoing wire diameter of the wire drawing machine. The control device can directly calculate the given linear velocity of the first target wire drawing unit in the wire drawing unit group by adopting the set linear velocity and the total elongation.
Then, for the target wire drawing units except the first target wire drawing unit in the target wire drawing unit group, determining the product of the elongation of the target wire drawing unit and the given linear velocity of the last target wire drawing unit as the given linear velocity of the target wire drawing unit.
For example, if the drawing machine has 6 drawing units in total, wherein the 3 rd, 5 th and 6 th drawing units are drawing units that need to be operated, and the 1 st, 2 th and 4 th drawing units need to be deactivated, the target drawing units in the target drawing unit group have the 3 rd, 5 th and 6 th drawing units. At this time, the 3 rd drawing unit of the drawing machine is a first target drawing unit, the 5 th drawing unit of the drawing machine is a second target drawing unit, and the 6 th drawing unit of the drawing machine is a third target drawing unit. After the given linear velocity of the first target wire drawing unit is obtained by calculation, the given linear velocity of the second target wire drawing unit can be obtained by calculation as follows: the product of the elongation of the second target drawing unit and the given linear speed of the first target drawing unit. And calculating the given linear speed of the third target wire drawing unit as follows: the elongation of the third target drawing unit multiplied by the given linear speed of the second target drawing unit. More specifically, the given linear velocity of the second target drawing unit may be R 5 ＝r 5 ×R 3 The given linear velocity of the third target drawing unit may be R 6 ＝r 6 ×R 5 . Wherein R is 3 Given line speed, R, of the 3 rd drawing unit of the drawing machine 5 Given line speed, R, for the 5 th drawing unit of the drawing machine 6 Given linear speed, r, for the 6 th drawing unit of the drawing machine 5 Elongation of the 5 th drawing unit of the drawing machine, r 6 The elongation of the 6 th drawing unit of the drawing machine.
In practice, controlling the motors of the respective target drawing units, except the take-up device, to operate at respective given linear speeds may comprise: and controlling each target wire drawing unit to operate at a corresponding given operating frequency. Wherein the given operating frequency of the target wire drawing unit is calculated by the following formula:
F m ＝50×R m ÷V m
wherein, F m Is the m-th drawing sheet of the drawing machineGiven operating frequency, R, of the element m Given linear velocity, V, of the m-th drawing unit of the drawing machine m Is the rated linear speed of the mth drawing unit of the drawing machine. 50 is the power frequency used to obtain the rated linear speed.
Here, for each target drawing unit, the control device may calculate a given operating frequency of the target drawing unit by substituting the given linear velocity and the rated linear velocity of the target drawing unit into the above equation.
In an alternative implementation manner of each embodiment of the present application, the control device may be further configured to: and controlling a speed measuring unit of each target wire drawing unit to detect the real-time linear speed of the target wire drawing unit, and finely adjusting the operating frequency of a motor of the target wire drawing unit according to the difference value between the real-time linear speed of the target wire drawing unit and the given linear speed.
Here, the control device may finely adjust the operating frequency of the motor of each target wire drawing unit in controlling the target wire drawing unit to operate corresponding to the given linear velocity and the given operating frequency, so that the target wire drawing unit stably and reliably operates.
In the foregoing implementation manner, when each wire drawing unit of the wire drawing machine has a first feedback coefficient for performing feedback adjustment on the wire drawing unit and a second feedback coefficient for performing feedback adjustment on a next wire drawing unit, the fine-tuning the operating frequency of the motor of the target wire drawing unit according to the difference between the real-time linear velocity of the target wire drawing unit and the given linear velocity may include: and performing feedback adjustment on the target wire drawing unit according to the product of the difference and the first feedback coefficient, and performing feedback adjustment on the next target wire drawing unit of the target wire drawing unit according to the product of the difference and the second feedback coefficient.
The first feedback coefficient and the second feedback coefficient may be preset values.
In practice, the sum of the first feedback coefficient and the second feedback coefficient is 1, and the first feedback coefficient is greater than the second feedback coefficient. Here, the purpose of the second feedback coefficient being smaller is to: the synchronous adjustment among the wire drawing units is ensured, and meanwhile, the interference on the self adjustment of other wire drawing units is reduced as much as possible. The method is beneficial to reducing the calculation complexity and improving the regulation efficiency.
Here, the drawing unit usually performs feedback adjustment based on its own real-time linear speed and operating frequency. According to the principle that the volume flow of the metal per second is equal, the total amount of the metal passing through each wire drawing unit in unit time needs to be kept consistent. For any wire drawing unit, if feedback adjustment is only performed on the target wire drawing unit, so that the linear velocity and the operating frequency of the wire drawing unit are infinitely close to the given linear velocity and the given operating frequency of the wire drawing unit, asynchronous adjustment between the wire drawing units may occur, and the whole wire drawing machine operates abnormally. When a certain target wire drawing unit is adjusted, feedback adjustment is performed on the next target wire drawing unit of the target wire drawing unit based on the difference value between the real-time linear velocity and the given linear velocity of the target wire drawing unit, synchronous adjustment can be performed among all target wire drawing units, and the whole wire drawing machine can be promoted to operate stably and reliably.
It should be noted that each wire drawing unit may be preset with a first feedback coefficient for performing feedback adjustment on itself and a second feedback coefficient for performing feedback adjustment on the next wire drawing unit, and the sum of the first feedback coefficient and the second feedback coefficient is 1. In practical application, during feedback adjustment, the control device may use a product of the real-time deviation of one wire drawing unit and the first feedback coefficient for speed feedback adjustment of the wire drawing unit, and may use a product of the real-time deviation of the wire drawing unit and the second feedback coefficient for speed feedback adjustment of a next wire drawing unit of the wire drawing unit. Wherein the real-time deviation is a difference between the real-time linear velocity and the given linear velocity.
Optionally, the speed measurement feedback state of the first target wire drawing unit in the target wire drawing unit group is an off state, the speed measurement feedback state of the target wire drawing units except the first target wire drawing unit in the target wire drawing unit group is an on state, and the speed measurement feedback state of the wire drawing units needing to be stopped in the wire drawing machine is an off state. Here, the speed measurement feedback of the first target wire drawing unit and the wire drawing unit needing to be stopped is disconnected, so that the calculation complexity of the control device can be simplified to a certain extent, and the calculation resource is saved.
In an alternative implementation manner of various embodiments of the present application, the control device may be further configured to: and during threading operation, controlling each diameter measuring unit to detect the outgoing line diameter of the corresponding wire drawing unit to obtain the outgoing line diameter of each wire drawing unit, wherein for each wire drawing unit, if the outgoing line diameter of the wire drawing unit is empty, the non-empty outgoing line diameter before and closest to the wire drawing unit is taken as the outgoing line diameter of the wire drawing unit. And regarding each wire drawing unit, taking the ratio of the square of the outlet diameter of the previous wire drawing unit to the square of the outlet diameter of the wire drawing unit as the elongation of the wire drawing unit. And determining the wire drawing unit with the elongation rate larger than 1 as the wire drawing unit needing to be operated, and determining the wire drawing unit with the elongation rate equal to 1 as the wire drawing unit needing to be stopped.
It should be noted that, for the 1 st wire drawing unit of the wire drawing machine, the ratio of the square of the incoming wire diameter of the whole wire drawing machine to the square of the outgoing wire diameter of the 1 st wire drawing unit may be used as the elongation of the 1 st wire drawing unit. And aiming at the wire drawing unit with the hollow outlet diameter, if the previous and nearest non-hollow outlet diameter does not exist, taking the inlet wire diameter of the whole wire drawing machine as the outlet wire diameter of the wire drawing unit. In addition, the control device typically stores the measured outlet diameter and elongation of each drawing unit.
Before the drawing machine normally operates, the metal wire passes through a die box of a target drawing unit under the action of external force, such as the driving of a chain, and finally is led out from a wire take-up device. The caliper unit may generally be a device for measuring the diameter of the outgoing wire of the drawing unit. In practice, the diameter measuring unit may be a laser diameter measuring instrument, a signal transceiver device, or the like.
Here, during threading operation, the control device may control each diameter measuring unit to detect the outgoing line diameter of the corresponding wire drawing unit, so as to obtain the outgoing line diameter of each wire drawing unit. If no wire passes through one wire drawing unit, the diameter measuring unit of the wire drawing unit cannot detect the outlet diameter, and at the moment, the diameter measuring unit of the wire drawing unit returns an empty value to the control device, namely, the outlet diameter of the wire drawing unit is empty. In practical applications, the diameter measuring unit can usually return to zero when the diameter of the outgoing line cannot be detected.
For any drawing unit, if the outgoing line diameter of the drawing unit is empty, for convenience of calculation, the control device may use the non-empty line diameter before and closest to the drawing unit as the outgoing line diameter of the drawing unit. For example, if the drawing machine has 6 drawing units in total, wherein the 3 rd, 5 th and 6 th drawing units are drawing units needing to be operated, and the 1 st, 2 th and 4 th drawing units need to be deactivated, the outlet wire diameters of the 1 st, 2 th and 4 th drawing units are empty, and the outlet wire diameters of the 3 rd, 5 th and 6 th drawing units are not empty. At this time, the wire inlet diameter of the wire drawing machine can be used as the wire outlet diameter of the 1 st wire drawing unit, the wire inlet diameter of the wire drawing machine can be used as the wire outlet diameter of the 2 nd wire drawing unit, and the wire outlet diameter of the 3 rd wire drawing unit can be used as the wire outlet diameter of the 4 th wire drawing unit.
Here, when the outlet diameter of each drawing unit is known, the control device may directly calculate the elongation of each drawing unit. In practice, an elongation of 1 indicates that the corresponding drawing unit does not need to be operated, i.e. needs to be deactivated. On the contrary, if the elongation is not 1, indicating that the corresponding wire drawing unit needs to operate.
In practice, the elongation of the wire rewinding device may or may not be 1, and may be set in accordance with actual requirements.
The realization mode can automatically and accurately determine the wire drawing units needing to be operated and the wire drawing units needing to be stopped.
In an alternative implementation manner of each embodiment of the present application, the control device may be further configured to: and when the motor runs, each speed measuring unit is controlled to detect the linear velocity of the corresponding wire drawing unit, and the detected linear velocity is used as the rated linear velocity of the wire drawing unit to obtain the rated linear velocity of each wire drawing unit.
Wherein the tacho unit is generally a device for measuring the linear speed of operation of the spool of the drawing unit. In practice, the speed measuring unit may be a linear velocity sensor or the like.
The installation and debugging process usually precedes the threading operation. During installation and debugging, the control device can control the motor of the wire drawing unit to operate at power frequency, wherein the power frequency can be 50 hertz (Hz). When the motor runs, the control device can control each speed measuring unit to measure the linear speed of the corresponding wire drawing unit, and the measured linear speed of the wire drawing unit is the rated linear speed of the wire drawing unit. It is noted that the control device will typically store the measured nominal linear velocity of each drawing unit. The implementation mode can automatically measure the rated linear speed of each wire drawing unit during installation and debugging.
Example two
With further reference to fig. 2, fig. 2 is a schematic flow chart of a control method of a wire drawing machine according to an embodiment of the present application. The control method of the wire drawing machine can be applied to the control system of the wire drawing machine in the first embodiment, and the control method of the wire drawing machine can comprise the following steps:
The target wire drawing unit in the target wire drawing unit group is a wire drawing unit needing to operate, and the last target wire drawing unit is a wire drawing unit at a wire winding end and is recorded as wire winding equipment.
And 203, controlling the motor of the wire rewinding device to operate at a set linear speed, and controlling the motors of all target wire drawing units except the wire rewinding device to operate at corresponding set linear speeds so as to control the wire drawing machine to operate.
In some embodiments, the determining the given linear velocity of each target wire drawing unit except the wire rewinding device according to the set linear velocity and the predetermined elongation of each target wire drawing unit includes:
determining the ratio of the set linear speed to the predetermined total elongation as the given linear speed of the first target wire drawing unit in the target wire drawing unit group;
and determining the product of the elongation of the target wire drawing unit and the given linear velocity of the last target wire drawing unit as the given linear velocity of the target wire drawing unit aiming at the target wire drawing units except the first target wire drawing unit in the target wire drawing unit group.
In some embodiments, controlling the motor of each target drawing unit, other than the wire take-up device, to operate at a respective given linear velocity comprises: controlling each target wire drawing unit to operate at a corresponding given operating frequency, wherein the given operating frequency of the target wire drawing unit is calculated by the following formula:
F m ＝50×R m ÷V m
wherein, F m For a given operating frequency, R, of the m-th drawing unit of the drawing machine m Given linear velocity, V, of the m-th drawing unit of the drawing machine m Is the rated linear speed of the mth drawing unit of the drawing machine.
In some embodiments, the method of controlling a wire drawing machine further comprises:
and controlling a speed measuring unit of each target wire drawing unit to detect the real-time linear speed of the target wire drawing unit, and finely adjusting the operating frequency of a motor of the target wire drawing unit according to the difference value between the real-time linear speed of the target wire drawing unit and the given linear speed.
In some embodiments, each drawing unit of the drawing machine has a first feedback coefficient for feedback adjustment of the drawing unit and a second feedback coefficient for feedback adjustment of the next drawing unit, and the fine adjustment of the operating frequency of the motor of the target drawing unit according to the difference between the real-time linear velocity of the target drawing unit and the given linear velocity comprises:
and performing feedback adjustment on the target wire drawing unit according to the product of the difference and the first feedback coefficient, and performing feedback adjustment on the next target wire drawing unit of the target wire drawing unit according to the product of the difference and the second feedback coefficient.
In some embodiments, the sum of the first feedback coefficient and the second feedback coefficient is 1, and the first feedback coefficient is greater than the second feedback coefficient.
According to the control method of the wire drawing machine provided by the embodiment, an operator only needs to input the preset linear velocity for the wire rewinding device, and the control device can determine the given linear velocity of each wire drawing unit based on the preset linear velocity and control each wire drawing unit to operate at the corresponding given linear velocity. The use of the wire drawing machine by operators can be simplified.
It should be noted that, the method for controlling a wire drawing machine provided in the embodiment of the present application is based on the same concept as that of the system embodiment of the present application, and specific functions and technical effects thereof can be found in the system embodiment section, which is not described herein again.
EXAMPLE III
The embodiment provides a control method of a wire drawing machine. The method for controlling the wire drawing machine provided by the embodiment can comprise three parts, namely a first part, a second part and a third part.
And the first part is used for measuring the rated linear speed of each wire drawing unit on the wire drawing machine when the wire drawing machine is installed and debugged.
Here, specifically, for any one drawing unit, the rated linear velocity of the drawing unit is obtained by: the PLC controller controls the motor of the wire drawing unit to operate at 50HZ, and controls a speed measuring unit (such as a linear velocity sensor) corresponding to the wire drawing unit to measure the linear velocity of the wire drawing unit when the motor operates. At this time, the measured linear velocity is a rated linear velocity of the drawing unit.
And in the second part, when the chain drives the metal wire to perform threading operation, the wire drawing unit needing to be operated and the wire drawing unit needing to be stopped are determined. Here, the second part may be implemented by three steps as follows:
in the first step, the PLC controller controls a diameter measuring unit (e.g., a laser diameter measuring instrument, a signal transceiver, etc.) corresponding to the wire drawing unit, and measures the diameter of the metal wire at the wire outlet end of the wire drawing unit, which may be referred to as the wire outlet diameter for convenience of description.
For example, assume that the drawing machine has a total of 4 drawing units, namely, the 1 st drawing unit, the 2 nd drawing unit, the 3 rd drawing unit and the 4 th drawing unit. During threading operation, an operator can specify that the metal wire only passes through 3 wire drawing units, for example, can specify that the 2 nd wire drawing unit does not pass through the wire, so that the 2 nd wire drawing unit does not pass through the metal wire, and the outlet diameter of the 2 nd wire drawing unit cannot be measured. At this time, for convenience of calculation, the outgoing line diameter of the 1 st drawing unit may be assigned to the outgoing line diameter of the 2 nd drawing unit. The outlet diameters of the 4 wire drawing units are obtained in turn: d1, D2, D3, D4, wherein D2= D1.
And secondly, after the PLC obtains the outlet diameter of each wire drawing unit, the elongation of each wire drawing unit can be calculated, then the elongation is compared with 1, the wire drawing unit with the elongation equal to 1 is determined to be the wire drawing unit needing to be stopped, and the wire drawing unit with the elongation not equal to 1 is determined to be the wire drawing unit needing to be operated.
By way of example of the first step in the second section above, the elongation of the 1 st drawing unit can be obtained as:
the elongation of the 2 nd drawing unit is:
the elongation of the 3 rd drawing unit is as follows:
the elongation of the 4 th drawing unit is:
at this time, the total elongation of the entire drawing machine is:
wherein D is 0 Diameter of the inlet wire of the entire wire drawing machine, D 4 The diameter of the outlet wire of the whole wire drawing machine.
And thirdly, analyzing the stop serial number by the PLC. Generally, the 1 st wire drawing unit is a reference wire drawing unit by default, if the 1 st wire drawing unit is a wire drawing unit needing to be stopped, the 2 nd wire drawing unit after the 1 st wire drawing unit is switched to the reference wire drawing unit, the speed measurement feedback unit of the reference wire drawing unit is in a disconnected state, the speed measurement feedback unit of the wire drawing unit needing to be stopped is also in a disconnected state, and the speed measurement feedback unit of the wire drawing unit needing to be operated except the reference wire drawing unit is in an opened state.
Here, the drawing unit to be operated is the aforementioned target drawing unit. The reference wire drawing unit is the first target wire drawing unit in the target wire drawing unit group.
The third part can be realized by the following four steps when the wire drawing machine is used for wire drawing:
firstly, a PLC controller receives a set linear speed which is input by an operator and aims at a take-up device.
Here, the wire take-up device is the last target drawing unit. In practice, the elongation of the take-up device may or may not be 1, and may be set in accordance with actual requirements.
And secondly, calculating the highest linear speed and the highest operating frequency of each wire drawing unit needing to operate by the PLC based on the set linear speed. The formula is as follows:
the highest linear speed of the reference wire drawing unit = set linear speed/total elongation;
the maximum operating frequency of the reference wire drawing unit =50 × maximum linear speed ÷ rated linear speed;
the highest linear speed of the other target wire drawing units = the elongation of the target wire drawing unit x the given linear speed of the last target wire drawing unit;
the highest operating frequency of the other target drawing units =50 × highest linear speed ÷ nominal linear speed.
Here, the other target drawing unit is a drawing unit that needs to be operated in addition to the reference drawing unit. The highest linear velocity is the aforementioned given linear velocity. The highest operating frequency is the aforementioned given operating frequency.
For example, if the drawing unit is required to operate, the drawing unit comprises: m, m +2, where the drawing unit before m does not need to be operated and the (m + 1) th drawing unit does not need to be operated. If the linear velocity is set to R 0 Total elongation of r 0 The rated linear speed of the mth wire drawing unit is V m Rated linear velocity of the m +2 th wire drawing unit is V m+2 The elongation of the (m + 2) th drawing unit is r m+2 . In this case, the reference drawing unit is the m-th drawing unit.
Maximum linear velocity R of mth drawing unit m ＝R 0 ÷r 0 And the highest operating frequency F of the m-th drawing unit m ＝50×R m ÷V m 。
Maximum linear speed R of m +2 wire drawing units m+2 ＝r m+2 ×R m Maximum operating frequency F of the m +2 th drawing unit m+2 ＝50×R m+2 ÷V m+2 。
And thirdly, controlling each wire drawing unit needing to be operated to operate at the highest linear speed and the highest operation frequency by the PLC.
And fourthly, calculating a difference value between the real-time linear speed and the given linear speed by the PLC according to the real-time linear speed obtained by the speed measuring unit corresponding to each wire drawing unit needing to operate, and finely adjusting the operating frequency of the motor of the target wire drawing unit based on the difference value.
It should be noted that the PLC controller in this embodiment is an implementation of the control device. In practical application, the control device can also be realized as a single chip microcomputer and the like.
According to the control method of the wire drawing machine provided by the embodiment, an operator only needs to input the preset linear speed for the wire rewinding device, and the control device can determine the given linear speed and the given operating frequency of each wire drawing unit based on the preset linear speed and control each wire drawing unit to operate at the corresponding given linear speed and the given operating frequency. The use of the wire drawing machine by operators can be simplified.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (8)
1. A control system of a wire drawing machine is characterized by comprising a control device and a plurality of wire drawing units connected in series, wherein each wire drawing unit is respectively connected with the control device,
the device comprises a control device, a wire drawing unit, a diameter measuring unit and a speed measuring unit, wherein the diameter measuring unit is used for measuring the outlet diameter of the wire drawing unit and the speed measuring unit is used for measuring the running linear speed of a winding drum of the wire drawing unit;
the control device is used for
Receiving a set linear speed input by a user aiming at a last target wire drawing unit in a target wire drawing unit group, wherein the target wire drawing unit in the target wire drawing unit group is a wire drawing unit needing to operate, and the last target wire drawing unit is a wire drawing unit at a wire take-up end and is marked as wire take-up equipment;
determining the given linear speed of each target wire drawing unit except the wire take-up device according to the set linear speed and the predetermined elongation of each target wire drawing unit;
controlling the motor of the wire rewinding device to operate at the set linear speed, and controlling the motors of all target wire drawing units except the wire rewinding device to operate at the corresponding set linear speed so as to control the wire drawing machine to operate;
and controlling a speed measuring unit of each target wire drawing unit to detect the real-time linear speed of the target wire drawing unit, and finely adjusting the operating frequency of a motor of the target wire drawing unit and the operating frequency of a motor of a next target wire drawing unit of the target wire drawing unit according to the difference value between the real-time linear speed of the target wire drawing unit and the given linear speed.
2. The drawing machine control system of claim 1, wherein the control device is further configured to:
when the threading operation is carried out, controlling each diameter measuring unit to detect the outgoing line diameter of the corresponding wire drawing unit to obtain the outgoing line diameter of each wire drawing unit, wherein for each wire drawing unit, if the outgoing line diameter of the wire drawing unit is empty, the non-empty outgoing line diameter before and nearest to the wire drawing unit is taken as the outgoing line diameter of the wire drawing unit; for each wire drawing unit, taking the ratio of the square of the outlet diameter of the previous wire drawing unit to the square of the outlet diameter of the wire drawing unit as the elongation of the wire drawing unit; and determining the wire drawing unit with the elongation rate larger than 1 as the wire drawing unit needing to be operated, and determining the wire drawing unit with the elongation rate equal to 1 as the wire drawing unit needing to be stopped.
3. The drawing machine control system of claim 1, wherein the control device is further configured to:
and when the motor runs, each speed measuring unit is controlled to detect the linear velocity of the corresponding wire drawing unit, and the detected linear velocity is used as the rated linear velocity of the wire drawing unit to obtain the rated linear velocity of each wire drawing unit.
4. A wire drawing machine control method applied to the wire drawing machine control system according to any one of claims 1 to 3, the wire drawing machine control method comprising:
receiving a set linear speed input by a user aiming at a last target wire drawing unit in a target wire drawing unit group, wherein the target wire drawing unit in the target wire drawing unit group is a wire drawing unit needing to operate, and the last target wire drawing unit is a wire drawing unit at a wire take-up end and is marked as wire take-up equipment;
determining the given linear velocity of each target wire drawing unit except the wire rewinding device according to the set linear velocity and the predetermined elongation of each target wire drawing unit;
controlling the motor of the take-up equipment to operate at the set linear velocity, and controlling the motors of all target wire drawing units except the take-up equipment to operate at the corresponding set linear velocity so as to control the wire drawing machine to operate;
and controlling a speed measuring unit of each target wire drawing unit to detect the real-time linear speed of the target wire drawing unit, and finely adjusting the operating frequency of a motor of the target wire drawing unit and the operating frequency of a motor of a next target wire drawing unit of the target wire drawing unit according to the difference value between the real-time linear speed of the target wire drawing unit and the given linear speed.
5. The control method of the wire drawing machine according to claim 4, wherein the determining the given linear velocity of each target wire drawing unit except the wire take-up device according to the set linear velocity and the predetermined elongation of each target wire drawing unit comprises:
determining the ratio of the set linear velocity to a predetermined total elongation as a given linear velocity of a first target wire drawing unit in the target wire drawing unit group;
and determining the product of the elongation of the target wire drawing unit and the given linear velocity of the last target wire drawing unit as the given linear velocity of the target wire drawing unit aiming at the target wire drawing units except the first target wire drawing unit in the target wire drawing unit group.
6. The method of controlling a wire drawing machine according to claim 5, wherein said controlling the motor of each target wire drawing unit other than the wire take-up device to operate at a respective given linear velocity comprises: controlling each target wire drawing unit to operate at a corresponding given operating frequency, wherein the given operating frequency of the target wire drawing unit is calculated by the following formula:
wherein, the first and the second end of the pipe are connected with each other,
for a given operating frequency of the m-th drawing unit of the drawing machine,
for a given linear speed of the m-th drawing unit of the drawing machine,
is the rated linear speed of the mth wire drawing unit of the wire drawing machine.
7. The method for controlling a wire drawing machine according to any one of claims 4 to 6, wherein each wire drawing unit of the wire drawing machine has a first feedback coefficient for feedback adjustment of itself and a second feedback coefficient for feedback adjustment of the next wire drawing unit, and the fine adjustment of the operating frequency of the motor of the target wire drawing unit according to the difference between the real-time linear velocity of the target wire drawing unit and the given linear velocity comprises:
and performing feedback adjustment on the target wire drawing unit according to the product of the difference and the first feedback coefficient, and performing feedback adjustment on the next target wire drawing unit of the target wire drawing unit according to the product of the difference and the second feedback coefficient.
8. The method according to claim 7, wherein the sum of the first feedback coefficient and the second feedback coefficient is 1, and the first feedback coefficient is larger than the second feedback coefficient.
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