Spinning frame double-spindle synchronous start-stop and rotating speed dynamic correction control system

Abstract

The invention relates to a spinning frame double-spindle synchronous start-stop and rotating speed dynamic correction control system which comprises a headstock spindle and a tailstock spindle, one end of the headstock spindle and one end of the tailstock spindle are respectively provided with a speed measuring device, and the other end of the headstock spindle and the other end of the tailstock spindle are respectively provided with a headstock spindle motor and a tailstock spindle motor. The headstock spindle motor and the tailstock spindle motor are respectively controlled by a headstock spindle frequency converter and a tailstock spindle frequency converter; a PLC (Programmable Logic Controller) is arranged at the tailstock of the spinning frame; the PLC controls the headstock spindle motor and the tailstock spindle motor to drive the headstock spindle and the tailstock spindle to rotate through starting and stopping of the headstock spindle frequency converter and the tailstock spindle frequency converter respectively, and the PLC dynamically corrects the rotating speed of the headstock spindle and the rotating speed of the tailstock spindle. The spindle on the spinning frame is driven by the headstock spindle and the tailstock spindle, so that the length of the spindle is shortened, influence on spinning quality due to the fact that the spindle is too long is avoided, and synchronous starting and stopping of the headstock spindle and the tailstock spindle at the same theoretical rotating speed are guaranteed.

Description

Technical Field

[0001] The invention belongs to a ring spinning frame, and in particular relates to a double-spindle synchronous start-stop and rotation speed dynamic correction control system for the ring spinning frame. Background Art

[0002] At present, with the increase in the number of spindles in spinning frames, spinning frames are gradually lengthened to super-long machines, but traditional spinning frames still use one main shaft. Today, the longest super-long spinning machine has reached 2,400 spindles, and the main shaft length of the super-long spinning machine has exceeded 85 meters. The increase in the length of the main shaft is likely to lead to insufficient rigidity of the main shaft, which in turn causes it to bend or deform easily during the spinning process. Moreover, when a spindle of such length is driven to rotate by a spindle motor, it will inevitably bring about the problem of decreased coaxiality of the main shaft, seriously affecting the spinning quality. At the same time, due to the increase in the length of the main shaft, it will vibrate when rotating, which will not only increase the energy consumption of the spinning frame, but also easily cause problems such as uneven yarn and increased end breakage. Summary of the invention

[0003] The purpose of the present invention is to provide a spinning frame dual-spindle synchronous start and stop and speed dynamic correction control system, which drives the spindles on the spinning frame through the front spindle and the rear spindle, and ensures that the front spindle and the rear spindle run synchronously.

[0004] The technical scheme of the present invention is: a control system for synchronous start and stop and dynamic speed correction of dual spindles of a spinning frame, comprising a head spindle and a tail spindle respectively arranged at the head and the tail of the spinning frame, one end of each of the head spindle and the tail spindle is provided with a speed measuring device, and the two speed measuring devices are arranged between the head spindle and the tail spindle, and the other ends of the head spindle and the tail spindle are respectively provided with a head spindle motor and a tail spindle motor for driving them to rotate, the head spindle motor and the tail spindle motor are respectively controlled by a head spindle frequency converter and a tail spindle frequency converter, the head spindle motor and the head spindle frequency converter are both arranged at the head of the spinning frame, and the tail spindle motor and the tail spindle frequency converter are both arranged at the tail of the spinning frame; a PLC controller and a human-machine interface are arranged at the tail of the spinning frame, and the PLC controller is connected with the human-machine interface, the head spindle frequency converter, the tail spindle frequency converter and the speed measuring device;

[0005] The theoretical spindle speed parameters of the front spindle and the rear spindle are set through the human-machine interface, and the human-machine interface sends the speed parameters to the PLC controller. The start and stop of the front spindle frequency converter and the rear spindle frequency converter are controlled by the PLC controller. The front spindle frequency converter and the rear spindle frequency converter respectively control the front spindle motor and the rear spindle motor to drive the front spindle and the rear spindle to rotate. The speed of the front spindle and the rear spindle is detected by the speed measuring device, and the detected data is sent to the PLC controller in the form of a pulse signal. The speed of the front spindle and the rear spindle is dynamically corrected through the analog module inside the PLC controller.

[0006] Furthermore, when the theoretical value of the spindle speed changes, the PLC controller performs a spindle speed dynamic correction algorithm calculation, and sends the calculation result to the head spindle frequency converter and the rear spindle frequency converter through the analog module; when the theoretical value of the spindle speed remains unchanged, the analog module performs a spindle speed dynamic correction algorithm calculation every 1 minute; in addition, within 3 minutes after the spinning frame starts spinning and during a period of time when the PLC controller sends a stop signal to completely stop the head spindle motor and the rear spindle motor, since the speed of the head spindle and the rear spindle changes very quickly during these two periods, the PLC controller performs a spindle speed dynamic correction algorithm calculation every 10 seconds during these two periods.

[0007] Furthermore, the dynamic correction algorithm formula of the spindle speed of the front spindle and the rear spindle is:

[0008]

[0009] A(t)=K A K(t) ΔV(t)

[0010] In the formula, V(t) represents the actual speed of the front spindle or the rear spindle at present, ∫ΔV(t)d(t) represents the speed deviation value of the front spindle or the rear spindle in the past, Indicates the future speed change trend of the front spindle or the rear spindle, K p , K i , K d They respectively represent the adjustment coefficient of the actual speed of the front spindle or the rear spindle, the adjustment coefficient of the speed deviation value of the front spindle or the rear spindle in the past, and the adjustment coefficient of the speed change trend of the front spindle or the rear spindle in the future. K(t) represents the calculated total adjustment coefficient; K A It represents the conversion coefficient of the current analog quantity, ΔV(t) represents the current speed deviation value of the front spindle or the rear spindle, and A(t) represents the speed analog quantity correction value of the front spindle or the rear spindle.

[0011] Furthermore, the theoretical values ​​of the rotational speeds of the front spindle and the rear spindle are set through a ten-point curve, which is determined by ten spindle rotational speed setting values ​​corresponding to ten spinning length ratio points, that is, the spindle rotational speed of the spinning frame during the entire spinning process is a smooth curve with low speeds at both ends and high speeds in the middle; specifically, the spinning length ratio point represents the proportional relationship between the yarn length and the full yarn length. For example, if the set full yarn length is 3000 meters, then 10% is 300 meters; in addition, the rotational speed of the front spindle or the rear spindle multiplied by the roller diameter divided by the spindle diameter is the spindle speed, so the spindle speed and the spindle speed have a certain theoretical value of the rotational speed at a certain moment of spinning.

[0012] Furthermore, parameters are set in the PLC controller through the human-machine interface. The parameters include a percentage setting value for the deviation between the actual speed of the head spindle or the rear spindle and the theoretical speed, which causes the spinning frame to stop. When the deviation range between the measured speed of the head spindle and the theoretical speed of the rear spindle is greater than the setting value, the entire spinning frame will alarm. At the same time, the PLC controller controls the head spindle and the rear spindle to stop running through the head spindle frequency converter and the rear spindle frequency converter respectively, so that the spinning frame stops. The parameters set in the device also include the percentage setting value of the mid-stop due to twist deviation. The PLC controller calculates the spinning twist of the head and tail of the spinning frame through the rotation speed of the head spindle and the tail spindle. When any twist deviation value of the head twist or the tail twist of the spinning frame is greater than the percentage setting value of the mid-stop due to twist deviation set in the PLC controller, the entire spinning frame will alarm. At the same time, the PLC controller controls the head spindle and the tail spindle to stop running through the head spindle frequency converter and the tail spindle frequency converter respectively, so that the spinning frame stops.

[0013] Furthermore, the head spindle frequency converter and the rear spindle frequency converter are connected to the same power supply. The head spindle frequency converter provides power for the head spindle motor, and the rear spindle frequency converter provides power for the rear spindle. At the same time, the rear spindle frequency converter provides power for the roller servo drive, the collar plate servo drive and the 24V switching power supply in the spinning machine.

[0014] Furthermore, a transmission box is provided between the front main shaft and the rear main shaft, the ends of the front main shaft and the rear main shaft are both arranged inside the transmission box, and a support seat for supporting the front main shaft or the rear main shaft is provided in the transmission box.

[0015] Furthermore, the speed measuring device includes a speed measuring code disk arranged at the end of the front spindle or the rear spindle of the vehicle, and a number of small holes are evenly arranged on the speed measuring code disk. A speed measuring sensor is arranged on one side of the speed measuring code disk, and a gap is provided between the speed measuring sensor and the speed measuring code disk. The speed measuring sensor is installed on a support seat, and the speed measuring sensor is connected to a PLC controller.

[0016] The beneficial effects of the present invention are as follows: the front spindle motor and the rear spindle motor are used to drive the front spindle and the rear spindle to run respectively, thereby reducing the length of the spindle, avoiding bending or deformation of the front spindle and the rear spindle during the spinning process, improving the coaxiality of the front spindle and the rear spindle, and avoiding vibration when the front spindle and the rear spindle rotate, thereby improving the spinning quality;

[0017] The front spindle and the rear spindle are started and stopped synchronously at the same speed through the speed measuring device and the PLC controller. The PLC controller uses the spindle speed dynamic correction algorithm to dynamically adjust the speed of the rear spindle and the front spindle through the analog module, so that the front spindle and the rear spindle are closer to the theoretical value of their speed.

[0018] By setting the percentage setting value of the mid-way stop due to the deviation between the actual speed of the head spindle or the tail spindle and the theoretical speed and the percentage setting value of the mid-way stop due to the twist deviation in the PLC controller, when the deviation range between the actual speed of the head spindle or the tail spindle calculated by the PLC controller and the theoretical speed exceeds the limit, and when the deviation range between the head twist or the tail twist and the set twist exceeds the limit, the PLC controller will control the spinning frame to alarm and stop, thereby ensuring that the yarn spun by the spinning frame will not have problems due to the deviation between the speed of the head spindle or the tail spindle and the theoretical speed;

[0019] By setting the same inverter parameters of power-off deceleration time, starting frequency amplitude, starting voltage, and threshold voltage for the head spindle inverter and the tail spindle inverter, it is ensured that the head spindle and the tail spindle can stop rotating synchronously when the power is off, and the rollers and collar plate of the spinning frame can stop synchronously with the head spindle and the tail spindle, thereby completing the power-off synchronous parking. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 It is the principle diagram of the present invention;

[0023] Figure 3 It is a ten-point curve diagram of the main axis of the spinning frame;

[0024] Figure 4 It is a schematic diagram of the flow chart of the dynamic correction algorithm of the spindle speed of the present invention;

[0025] Figure 5 Schematic diagram of the power supply system of the present invention. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "upper", "lower", "one side", "one end", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; in addition, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Since the length of the main shaft increases with the increase in the number of spindles in the spinning frame, the increase in the main shaft length can easily lead to insufficient rigidity of the main shaft, which in turn makes it easy to bend or deform during the spinning process. Moreover, when a main shaft of such a length is driven to rotate by a spindle motor, it will inevitably bring about problems such as decreased coaxiality and increased vibration of the main shaft, seriously affecting the spinning quality. In view of this, the inventor of the present application provides a spinning frame dual-spindle synchronous start and stop and dynamic speed correction control system, which drives the spindles on the spinning frame through the head spindle and the rear spindle, shortens the length of the main shaft, avoids the influence of the spinning quality due to the excessive length of the spindle, and ensures the synchronous operation of the head spindle and the rear spindle.

[0029] like Figure 1-5As shown, a spinning frame dual-spindle synchronous start-stop and speed dynamic correction control system comprises a head spindle 1 and a tail spindle 2 respectively arranged at the head and the tail of the spinning frame, one end of the head spindle 1 and the tail spindle 2 are provided with a speed measuring device 6, the two speed measuring devices are both arranged between the head spindle 1 and the tail spindle 2, the other ends of the head spindle 1 and the tail spindle 2 are respectively provided with a head spindle motor 12 and a tail spindle motor 22 driving them to rotate, the head spindle motor 12 and the tail spindle motor 22 are respectively provided with a head spindle motor 12 and a tail spindle motor 22 driving them to rotate, The tail spindle motor 22 is controlled by the front spindle frequency converter 11 and the rear spindle frequency converter 21 respectively. The front spindle motor 12 and the front spindle frequency converter 11 are both arranged at the front of the spinning frame, and the rear spindle motor 22 and the rear spindle frequency converter 21 are both arranged at the rear of the spinning frame; a PLC controller 3 and a human-machine interface 4 are arranged at the rear of the spinning frame, and the PLC controller 3 is connected to the human-machine interface 4, the front spindle frequency converter 11, the rear spindle frequency converter 21 and the speed measuring device 6.

[0030] Based on the above embodiments, the present application divides the original long spindle into a front spindle 1 and a rear spindle 2, and drives the front spindle 1 and the rear spindle 2 to operate respectively through the front spindle motor 12 and the rear spindle motor 22, thereby reducing the length of the spindle, avoiding bending or deformation of the front spindle 1 and the rear spindle 2 during the spinning process, improving the coaxiality of the front spindle 1 and the rear spindle 2, and avoiding vibration when the front spindle 1 and the rear spindle 2 rotate, thereby improving the spinning quality.

[0031] In this embodiment, if Figure 2 and Figure 4 As shown, the theoretical value parameters of the spindle speeds of the front spindle 1 and the rear spindle 2 are set through the human-machine interface 4, and the human-machine interface 4 sends the speed parameters to the PLC controller 3. The start and stop of the front spindle frequency converter 11 and the rear spindle frequency converter 21 are controlled through the PLC controller 3. The front spindle frequency converter 11 and the rear spindle frequency converter 21 respectively control the front spindle motor 12 and the rear spindle motor 22 to drive the front spindle 1 and the rear spindle 2 to rotate. The speed measuring device 6 detects the speed of the front spindle 1 and the rear spindle 2, and the detected data is sent to the PLC controller 3 in the form of a pulse signal. The speed of the front spindle 1 and the rear spindle 2 is dynamically corrected through the analog module 31 inside the PLC controller 3.

[0032] Specifically, when the theoretical value of the spindle speed changes, the PLC controller 3 performs a spindle speed dynamic correction algorithm 44 operation, and sends the operation result to the head spindle frequency converter 11 and the rear spindle frequency converter 21 through the analog module 31; when the theoretical value of the spindle speed remains unchanged, the analog module 31 performs a spindle speed dynamic correction algorithm 44 operation every 1 minute; in addition, within 3 minutes after the spinning frame starts spinning and during a period of time when the PLC controller 3 sends a stop signal to completely stop the operation of the head spindle motor 12 and the rear spindle motor 22, since the speed of the head spindle 1 and the rear spindle 2 changes very quickly during these two periods of time, the PLC controller 3 performs a spindle speed dynamic correction algorithm 44 operation every 10 seconds during these two periods of time.

[0033] Based on the above embodiment, since a large number of programs are set up inside the PLC controller 3, all the resources of the PLC controller 3 cannot be used to run the spindle speed dynamic correction algorithm 44 of the front spindle 1 and the rear spindle 2. Therefore, the dual-spindle synchronous start and stop and speed dynamic correction control system adopts a method of running the spindle speed dynamic correction algorithm 44 program instructions of the front spindle 1 and the rear spindle 2 only once when certain conditions are met, and adopts different spindle speed dynamic correction algorithm 44 running frequencies in different stages of spinning of the spinning frame, so that the PLC controller 3 can run the spindle speed dynamic correction algorithm 44 program instructions of the front spindle 1 and the rear spindle 2 conditionally and frequently, which not only ensures the effective utilization of the operating resources of the PLC controller 3, but also ensures that the spindle speed dynamic correction algorithm 44 corrects the speed of the front spindle 1 and the rear spindle 2 in real time.

[0034] In this embodiment, the dynamic correction algorithm 44 for the spindle speeds of the front spindle 1 and the rear spindle 2 is as follows:

[0035]

[0036] A(t)=K A K(t) ΔV(t)

[0037] Where V(t) represents the actual speed of the current front spindle 1 or rear spindle 2, ∫ΔV(t)d(t) represents the speed deviation of the front spindle 1 or rear spindle 2 in the past, Indicates the future speed change trend of the front spindle 1 or the rear spindle 2, K p , K i , K d They respectively represent the adjustment coefficient of the actual speed of the front spindle 1 or the rear spindle 2, the adjustment coefficient of the speed deviation value of the front spindle 1 or the rear spindle 2 in the past, and the adjustment coefficient of the speed change trend of the front spindle 1 or the rear spindle 2 in the future. K(t) represents the calculated total adjustment coefficient; K AIt represents the conversion coefficient of the current analog quantity, ΔV(t) represents the current speed deviation value of the front spindle 1 or the rear spindle 2, and A(t) represents the speed analog quantity correction value of the front spindle 1 or the rear spindle 2.

[0038] Among them, Figure 3 , Figure 4 As shown, the theoretical speed values ​​of the front spindle 1 and the rear spindle 2 are set by a ten-point curve, and the ten-point curve is determined by ten spindle speed setting values ​​corresponding to ten spinning length ratio points, that is, the spindle speed of the spinning frame in the whole spinning process is a smooth curve with low speeds at both ends and high speed in the middle; specifically, the spinning length ratio point represents the proportional relationship between the yarn length and the full yarn length. For example, if the set full yarn length is 3000 meters, then 10% is 300 meters; in addition, the speed of the front spindle 1 or the rear spindle 2 multiplied by the roller diameter divided by the spindle diameter is the spindle speed, so the spindle speed and the spindle speed have a certain theoretical speed value at a certain moment of spinning.

[0039] Based on the above embodiment, since the main shaft of the spinning frame is divided into two main shafts, the front shaft and the rear shaft, the consistency and correctness of the rotational speeds of the front shaft 1 and the rear shaft 2 are particularly important when the spinning frame is running. The spindle speed of the spinning frame is operated according to the ten-point curve setting on the human-machine interface. The spindle speed dynamic correction algorithm 44 compares the measured spindle speeds of the front shaft 1 and the rear shaft 2 with the real-time theoretical speeds, respectively, to obtain the rotational speed deviation value of the front shaft 1 and the rotational speed deviation value of the rear shaft 2. The spindle speed dynamic correction algorithm 44 is based on the current rotational speeds of the front shaft 1 and the rear shaft 2. The actual speed of 2, the speed deviation value of the front spindle 1 and the rear spindle 2 in the past and the changing trend of the speed of the front spindle 1 and the rear spindle 2 in the "ten-point curve" are used to comprehensively analyze the current speed deviation value of the front spindle 1 and the speed deviation value of the rear spindle 2, and the analog correction values ​​of the spindle speeds of the front spindle 1 and the rear spindle 2 are obtained respectively, so as to control the front spindle frequency converter 11 and the rear spindle frequency converter 21 through the analog module of the PLC controller to adjust the speeds of the front spindle 1 and the rear spindle 2, so that the front spindle 1 and the rear spindle 2 are closer to the theoretical values ​​of their speeds.

[0040] Specifically, a spindle speed setting value 41 is input into the PLC controller 3 through the human-machine interface 4, and the theoretical spindle speed values ​​42 of the front spindle 1 and the rear spindle 2 are calculated through the PLC controller 3. The theoretical spindle speed value 42 is compared with the speed of the front spindle 1 and the speed of the rear spindle 2, respectively, to obtain a front spindle speed deviation 43-1 and a rear spindle speed deviation 43-2. ​​According to the front spindle speed deviation 43-1 and the rear spindle speed deviation 43-2, a front spindle speed analog correction value 45-1 and a rear spindle speed analog correction value 45-2 are calculated respectively through a spindle speed dynamic correction algorithm 44, and the speeds of the front spindle 1 and the rear spindle 2 are dynamically corrected through the front spindle speed analog correction value 45-1 and the rear spindle speed analog correction value 45-2.

[0041] In this embodiment, parameters are set in the PLC controller 3 through the human-machine interface 4, and the parameters include a percentage setting value of the deviation between the actual speed of the head spindle 1 or the rear spindle 2 and the theoretical speed, and when the deviation range between the measured speed and the theoretical speed of either the head spindle 1 or the rear spindle 2 is greater than the setting value, the entire spinning frame will alarm, and at the same time, the PLC controller 3 controls the head spindle 1 and the rear spindle 2 to stop running through the head spindle frequency converter 11 and the rear spindle frequency converter 21, respectively, so that the spinning frame stops; the PLC controller 3 is set to the PLC controller on the human-machine interface. The parameters set in the controller 3 also include a percentage setting value for stopping due to twist deviation. The PLC controller 3 calculates the spinning twist of the head and tail of the spinning frame through the rotation speed of the head spindle 1 and the tail spindle 2. When any twist deviation value of the head twist or the tail twist of the spinning frame is greater than the percentage setting value of the twist deviation stopping due to midway set in the PLC controller 3, the entire spinning frame will alarm. At the same time, the PLC controller 3 controls the head spindle 1 and the tail spindle 2 to stop running respectively through the head spindle frequency converter 11 and the tail spindle frequency converter 21, so that the spinning frame stops.

[0042] Based on the above embodiment, since the spinning twist of the spinning frame is equal to the spindle speed divided by the front roller line speed, and the spindle speed is equal to the spindle speed multiplied by the roller diameter divided by the spindle diameter, if the speed of the head spindle 1 or the tail spindle 2 deviates, the spindle speed will deviate, and if the spindle speed deviates, the twist of the yarn will deviate; in order to ensure that there is no problem with the spinning twist of the spinning frame, by setting the percentage setting value of the midway stop of the deviation between the actual speed of the head spindle 1 or the tail spindle 2 and the theoretical speed and the percentage setting value of the midway stop of the twist deviation in the PLC controller 3, when the deviation range between the actual speed of the head spindle 1 or the tail spindle 2 calculated by the PLC controller 3 and the theoretical speed exceeds the limit and the deviation range between any one of the head twist and the tail twist and the set twist exceeds the limit, the PLC controller 3 will control the spinning frame to alarm and stop, thereby ensuring that the yarn spun by the spinning frame will not have problems due to the deviation between the speed of the head spindle 1 or the tail spindle 2 and the theoretical speed.

[0043] In this embodiment, if Figure 5 As shown, the head spindle frequency converter 11 and the tail spindle frequency converter 21 are connected to the same power supply 35. The head spindle frequency converter 11 provides power for the head spindle motor 12, and the tail spindle frequency converter 21 provides power for the tail spindle 22. At the same time, the tail spindle frequency converter 21 provides power for the roller servo driver 32, the collar plate servo driver 33 and the 24V switching power supply 34 in the spinning frame through the DC bus terminal 23.

[0044] Based on the above embodiment, the roller servo driver 32 drives the rollers in the spinning frame to rotate, the steel collar plate servo driver 33 drives the steel collar plate in the spinning frame to rise and fall, and the 24V switching power supply 34 provides power for the PLC controller 3 of the spinning frame and several detection sensors on the spinning frame; the roller servo driver 32, the steel collar plate servo driver 33 and the 24V switching power supply 34 are all commonly used equipment in the spinning frame and are not described in detail in this application; in the case of a sudden power outage, the entire spinning frame stops suddenly, and the head spindle frequency converter 11 and the rear spindle frequency converter 21 are powered off at the same time, so that the head spindle 1 and the rear spindle 2 can stop rotating synchronously, and at the same time At this time, the roller servo driver 32 and the collar plate servo driver 33 of the spinning frame stop running at the same time, ensuring that the roller rotation action and the collar plate lifting action of the spinning frame can stop synchronously; setting appropriate and identical inverter parameters of power-off parking deceleration time, starting frequency amplitude, starting voltage, and threshold voltage for the head spindle inverter 11 and the tail spindle inverter 21 ensures that the head spindle 1 and the tail spindle 2 can stop rotating synchronously when the power is off, and the rollers and collar plate of the spinning frame can also stop synchronously with the head spindle 1 and the tail spindle 2 under the voltage regulation of the DC bus of the tail spindle inverter 21, thereby completing the power-off synchronous parking.

[0045] In this embodiment, if Figure 1 As shown, a transmission box 5 is provided between the front spindle 1 and the rear spindle 2, and the ends of the front spindle 1 and the rear spindle 2 are both arranged inside the transmission box 5. A support seat 51 for supporting the front spindle 1 or the rear spindle 2 is provided inside the transmission box 5.

[0046] In addition, the speed measuring device 6 includes a speed measuring code disk 61 arranged at the end of the front spindle 1 or the rear spindle 2, and a plurality of small holes are evenly arranged on the speed measuring code disk 61. A speed measuring sensor 62 is arranged on one side of the speed measuring code disk 61, and a gap is provided between the speed measuring sensor 62 and the speed measuring code disk 61. The speed measuring sensor 62 is installed on the support seat 51, and the speed measuring sensor 62 is connected to the PLC controller 3.

[0047] Based on the above embodiment, when the front spindle 1 and the rear spindle 2 drive the speed code disk 61 installed at their ends to rotate, several small holes on the speed code disk 61 will pass through the speed sensor 62 in turn, and the pulse signal formed by the speed sensor 62 will be transmitted to the PLC controller 3, and the rotational speed of the front spindle 1 and the rear spindle 2 will be calculated by the PLC controller 3; since there is no actual contact between the speed sensor 62 and the speed code disk 61, and there is an air isolation of several millimeters, the speed code disk 61 and the speed sensor 62 are not easily damaged during use and are suitable for long-term use.

[0048] The working principle of the present invention is as follows: the theoretical speed parameters of the front spindle 1 and the rear spindle 2 are set on the human-machine interface 4, and the theoretical speed parameters are sent to the PLC controller 3, the PLC controller 3 sends the start enable signal to the front spindle frequency converter 11 and the rear spindle frequency converter 21, the front spindle frequency converter 11 and the rear spindle frequency converter 21 simultaneously drive the front spindle motor 12 and the rear spindle motor 22 to operate, the front spindle motor 12 and the rear spindle motor 22 start to operate at the same time, thereby making the front spindle 1 and the rear spindle 2 rotate at the same time, the speed measuring device 6 at the end of the front spindle 1 detects the speed of the front spindle 1, and the speed measuring device 6 at the end of the rear spindle 2 detects the speed of the rear spindle 2, the two speed measuring devices 6 The rotation speeds of the front device 1 and the rear spindle 2 are respectively sent to the PLC controller 3 in the form of pulse signals. The PLC controller 3 calculates the rotation speeds of the front spindle 1 and the rear spindle 2, and compares them with the spindle speed theoretical value 42. The spindle speed dynamic correction algorithm 44 is used to calculate the front spindle speed analog correction value 45-1 and the rear spindle speed analog correction value 45-2, and the two spindle speed analog correction values ​​are respectively sent to the front spindle frequency converter 11 and the rear spindle frequency converter 21 through the analog module 31 in the form of current signals, so as to adjust the rotation speeds of the front spindle 1 and the rear spindle 2 in real time, so as to ensure that the front spindle 1 and the rear spindle 2 are started and stopped synchronously at the same theoretical speed.

[0049] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A control system for synchronous start and stop and dynamic speed correction of dual spindles of a spinning frame, comprising a head spindle and a tail spindle respectively arranged at the head and the tail of the spinning frame, characterized in that: One end of the head spindle and the tail spindle are both provided with a speed measuring device, and the two speed measuring devices are both provided between the head spindle and the tail spindle, and the other ends of the head spindle and the tail spindle are respectively provided with a head spindle motor and a tail spindle motor for driving them to rotate, and the head spindle motor and the tail spindle motor are respectively controlled by a head spindle frequency converter and a tail spindle frequency converter, and the head spindle motor and the head spindle frequency converter are both provided at the head of the spinning frame, and the tail spindle motor and the tail spindle frequency converter are both provided at the tail of the spinning frame; a PLC controller and a human-machine interface are provided at the tail of the spinning frame, and the PLC controller is connected with the human-machine interface, the head spindle frequency converter, the tail spindle frequency converter and the speed measuring device; The theoretical spindle speed parameters of the front spindle and the rear spindle are set through the human-machine interface, and the human-machine interface sends the speed parameters to the PLC controller. The start and stop of the front spindle frequency converter and the rear spindle frequency converter are controlled by the PLC controller. The front spindle frequency converter and the rear spindle frequency converter respectively control the front spindle motor and the rear spindle motor to drive the front spindle and the rear spindle to rotate. The speed of the front spindle and the rear spindle is detected by the speed measuring device, and the detected data is sent to the PLC controller in the form of a pulse signal. The speed of the front spindle and the rear spindle is dynamically corrected through the analog module inside the PLC controller.

2. A spinning frame dual-spindle synchronous start-stop and speed dynamic correction control system according to claim 1, characterized in that: When the theoretical value of the spindle speed changes, the PLC controller performs a spindle speed dynamic correction algorithm calculation, and sends the calculation result to the head spindle frequency converter and the rear spindle frequency converter through the analog module; when the theoretical value of the spindle speed remains unchanged, the analog module performs a spindle speed dynamic correction algorithm calculation every 1 minute; in addition, within 3 minutes after the spinning frame starts spinning and during a period of time when the PLC controller sends a stop signal to completely stop the head spindle motor and the rear spindle motor, since the speed of the head spindle and the rear spindle changes very quickly during these two periods, the PLC controller performs a spindle speed dynamic correction algorithm calculation every 10 seconds during these two periods.

3. A spinning frame dual-spindle synchronous start-stop and speed dynamic correction control system according to claim 2, characterized in that: The dynamic correction algorithm formula for the spindle speed of the front spindle and the rear spindle is: A(t)=K A ·K(t)·ΔV(t) In the formula, V(t) represents the actual speed of the front spindle or the rear spindle at present, ∫ΔV(t)d(t) represents the speed deviation value of the front spindle or the rear spindle in the past, Indicates the future speed change trend of the front spindle or the rear spindle, K p , K i , K d They respectively represent the adjustment coefficient of the actual speed of the front spindle or the rear spindle, the adjustment coefficient of the speed deviation value of the front spindle or the rear spindle in the past, and the adjustment coefficient of the speed change trend of the front spindle or the rear spindle in the future. K(t) represents the calculated total adjustment coefficient; K A It represents the conversion coefficient of the current analog quantity, ΔV(t) represents the current speed deviation value of the front spindle or the rear spindle, and A(t) represents the speed analog quantity correction value of the front spindle or the rear spindle.

4. A spinning frame dual-spindle synchronous start-stop and speed dynamic correction control system according to claim 3, characterized in that: The theoretical speed values ​​of the front spindle and the rear spindle are set by a ten-point curve. The ten-point curve is determined by ten spindle speed setting values ​​corresponding to ten spinning length ratio points. That is, the spindle speed of the spinning frame during the entire spinning process is a smooth curve with low speeds at both ends and high speed in the middle. The speed of the front spindle or the rear spindle multiplied by the roller diameter divided by the spindle diameter is the spindle speed. Therefore, the spindle speed and the spindle speed have a certain theoretical speed value at a certain moment of spinning.

5. A spinning frame dual-spindle synchronous start-stop and speed dynamic correction control system according to claim 4, characterized in that: The parameters are set in the PLC controller through the human-machine interface. The parameters include a percentage setting value for the deviation between the actual speed of the head spindle or the rear spindle and the theoretical speed, and the percentage setting value for the midway stop. When the deviation range between the measured speed and the theoretical speed of either the head spindle or the rear spindle is greater than the setting value, the entire spinning frame will alarm, and the PLC controller will control the head spindle and the rear spindle to stop running through the head spindle frequency converter and the rear spindle frequency converter respectively, so that the spinning frame stops. The parameters set also include the percentage setting value of the mid-way stop due to twist deviation. The PLC controller calculates the spinning twist of the head and tail of the spinning frame through the rotation speed of the head spindle and the tail spindle. When any twist deviation value of the head twist or the tail twist of the spinning frame is greater than the percentage setting value of the mid-way stop due to twist deviation set in the PLC controller, the entire spinning frame will alarm. At the same time, the PLC controller controls the head spindle and the tail spindle to stop running respectively through the head spindle frequency converter and the tail spindle frequency converter, so that the spinning frame stops.

6. A spinning frame dual-spindle synchronous start-stop and speed dynamic correction control system according to claim 5, characterized in that: The head spindle frequency converter and the tail spindle frequency converter are connected to the same power supply. The head spindle frequency converter provides power for the head spindle motor, and the tail spindle frequency converter provides power for the tail spindle. At the same time, the tail spindle frequency converter provides power for the roller servo driver, the collar plate servo driver and the 24V switching power supply in the spinning frame.

7. A spinning frame dual-spindle synchronous start-stop and speed dynamic correction control system according to claim 6, characterized in that: A transmission box is provided between the front spindle and the rear spindle, the ends of the front spindle and the rear spindle are both arranged inside the transmission box, and a support seat for supporting the front spindle or the rear spindle is provided in the transmission box.

8. A spinning frame dual-spindle synchronous start-stop and speed dynamic correction control system according to claim 7, characterized in that: The speed measuring device includes a speed measuring code disk arranged at the end of the front spindle or the rear spindle of the vehicle, and a plurality of small holes are evenly arranged on the speed measuring code disk. A speed measuring sensor is arranged on one side of the speed measuring code disk, and a gap is provided between the speed measuring sensor and the speed measuring code disk. The speed measuring sensor is installed on a support seat, and the speed measuring sensor is connected to a PLC controller.

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