Method and system for controlling and adjusting single-screw lifter of overhead ground wire

Abstract

The invention relates to the technical field of overhead ground wire lifter control, in particular to an overhead ground wire single-lead-screw lifter control and adjustment method and system, and the method comprises the steps: obtaining the tension and vibration strength of a chain in the lifting process of an overhead ground wire, extracting the change period of the tension and vibration strength, constructing the tension change degree and vibration intensity, and calculating the tension change degree and the vibration intensity. The wind interference degree of a chain in the single-screw lifter at the current moment is obtained, and the chain looseness degree of the single-screw lifter at the current moment is obtained by combining the chain tension descending trend and the vibration strength ascending trend of multiple adjacent sampling moments at the current moment, so that the feedback wire tightening force in the wire tightener at the current moment is obtained; and controlling and adjusting the tightening force of the tightener by using a PID controller according to the feedback tightening force and the actual tightening force in the tightener at the current moment. According to the invention, the tightening force in the tightener can be accurately adjusted.

Description

Technical Field

[0001] The present application relates to the technical field of overhead ground wire lifter control, and in particular to a control and adjustment method and system for an overhead ground wire single-screw lifter. Background Art

[0002] Overhead ground wires are circuits laid to protect power transmission lines from direct lightning strikes. However, under unbalanced tension, thunderstorms and other adverse working conditions, the supporting hardware of overhead ground wires will wear and rust, and the hardware needs to be checked and replaced in a timely manner. The single-screw lifter is a device that lifts the overhead ground wire over a short distance. Controlling and adjusting the single-screw lifter can achieve safe and stable lifting of the overhead ground wire, thereby ensuring the safety of the overhead ground wire during replacement and reducing the risk of maintenance operations. Therefore, accurately controlling and adjusting the single-screw lifter of the overhead ground wire can effectively ensure the safety of the overhead ground wire during maintenance, which has important practical significance in the actual maintenance and replacement of the overhead ground wire.

[0003] At present, common overhead ground wire hoists mainly include fixed brackets, chains, ground wire hooks, and tensioners. During the lifting process of the overhead ground wire, the tensioner in the hoist is tightened and braked in time to ensure safe and stable lifting of the overhead ground wire. However, due to the instability of the chain's stress and shaking during the lifting process, the tensioner in the existing overhead ground wire single-screw hoist is prone to insufficient tension after the overhead ground wire is lifted. Since the tensioner is not tightened and braked in time, the overhead ground wire is prone to accidental slippage, resulting in poor safety and reliability during the ground wire lifting process. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of this application is to provide a control and adjustment method and system for an overhead ground wire single-screw lifter. The technical solutions adopted are as follows: The embodiment of the present application provides a method for controlling and adjusting an overhead ground wire single-screw lifter, comprising the following steps: Obtain the chain tension and vibration intensity during the overhead ground wire lifting process; Perform frequency domain transformation on tension and vibration intensity to extract the variation period of tension and vibration intensity; By analyzing the degree of frequent changes in the tension of the chain in the single-screw lifter in each change cycle and the severity of the change in vibration intensity over time, the tension change degree and vibration severity are constructed respectively; According to the correlation between the tension change degree and the vibration severity in each change cycle before the current moment, as well as the average level of the tension change degree and the average level of the vibration severity, the wind interference degree of the chain in the single-screw lift at the current moment is obtained; Analyze the downward trend of chain tension and the upward trend of vibration intensity at multiple adjacent sampling moments at the current moment, construct the downward trend of tightening on the chain at the current moment, and combine the degree of wind interference of the chain in the single-screw lifter to obtain the chain looseness of the single-screw lifter at the current moment. Use the change difference of chain looseness and the tightening force in the tightening device at the current moment and the preset tightening force adjustment amount to obtain the feedback tightening force in the tightening device at the current moment; According to the feedback tightening force and actual tightening force in the tightening device at the current moment, the tightening force of the tightening device is controlled and adjusted by using a PID controller.

[0005] Preferably, the extraction of the variation period of the tension and vibration intensity further comprises: Obtain the vectors composed of the tension and vibration intensity at all historical sampling moments within a preset time before the current moment in chronological order, as the tension vector and vibration intensity vector at the current moment; The tension vector at the current moment is transformed in the frequency domain to obtain the amplitudes of all frequencies in the frequency domain, and the inverse of the frequency corresponding to the maximum amplitude is taken as the tension change period in the short time before the current moment; accordingly, for the vibration intensity vector, the fast Fourier transform is used to obtain the vibration change period in the short time before the current moment.

[0006] Preferably, the construction of the tension variation degree further includes: Arrange the tensions in each tension change period before the current moment in ascending order of time to form a tension period vector of each tension change period, and accordingly, obtain a vibration period vector of each vibration change period for the vibration intensity in each vibration period; For each tension periodic vector, the first-order difference sequence of the tension periodic vector is obtained, the number of all non-zero elements in the first-order difference sequence is counted, recorded as the change frequency, and the mean of the absolute values ​​of all non-zero elements in the first-order difference sequence is calculated, recorded as the average change amplitude, and the product of the change frequency and the average change amplitude is taken as the tension change degree in each tension change period.

[0007] Preferably, the construction of the vibration severity further includes: For each vibration period vector, the mean of the absolute values ​​of all elements in the first-order difference sequence of the vibration period vector is calculated as the vibration severity of each vibration change period.

[0008] Preferably, the calculation formula corresponding to the wind interference degree of the chain in the single-screw lifter at the current moment is: ; In the formula, is the degree of wind interference on the chain in the single-screw lifter at the current moment, is the correlation between the tension change degree vector and the vibration severity vector at the current moment, wherein the tension change degrees of all tension change cycles are arranged in ascending time order to form the tension change degree vector at the current moment, and the vibration severity degrees of all vibration change cycles are arranged in ascending time order to form the vibration severity vector at the current moment, is the mean value of the elements in the tension change vector at the current moment, is the mean value of the elements in the vibration severity vector at the current moment.

[0009] Preferably, the construction of the tightening downward trend degree on the chain at the current moment includes: The multiple moments with the closest time intervals to the current moment are all used as adjacent sampling moments of the current moment, and the tension downward trend amount and the vibration upward trend amount of the current moment are obtained according to the chain tension change and vibration intensity change at the multiple adjacent sampling moments; The product of the downward trend of tension at the current moment and the upward trend of vibration is determined as the downward trend degree of tightening on the chain at the current moment.

[0010] Preferably, the tension downward trend amount and vibration upward trend amount at the current moment further include: Arranging the chain tension and vibration intensity at the plurality of adjacent sampling moments in ascending order of time to form a tension trend vector and a vibration trend vector at the current moment, and calculating the first-order difference vector of the tension trend vector and the vibration trend vector at the current moment respectively; The sum of the absolute values ​​of all negative values ​​in the first-order difference vector of the tension trend vector is taken as the tension downward trend quantity at the current moment, and the sum of all positive values ​​in the first-order difference vector of the vibration trend vector is taken as the vibration upward trend quantity at the current moment.

[0011] Preferably, the calculation process of the chain looseness of the single-screw lifter at the current moment is: ; In the formula, is the chain looseness of the single screw lifter at the current moment, is an exponential function with a natural constant as base, is the degree of wind interference on the chain in the single-screw lifter at the current moment, It is the degree of tightening downward trend on the chain at the current moment.

[0012] Preferably, the calculation process of the feedback tensioning force in the tensioner at the current moment is: ; In the formula, is the feedback tension force in the tensioner at the current moment, is the tension force in the tensioner at the current moment, is the chain looseness at the current moment, is the chain looseness at the sampling moment before the current moment, is the preset tension adjustment amount, where the tension adjustment amount does not exceed 10% of.

[0013] An embodiment of the present application also provides an overhead ground wire single-screw lifter control and adjustment system, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, wherein the processor implements the steps of any one of the above-mentioned methods when executing the computer program.

[0014] From the above, it can be seen that the control and adjustment method and system of the overhead ground wire single-screw lifter provided by the present application have at least the following beneficial effects: This application uses FFT fast Fourier transform to obtain the changing cycle of tension and vibration intensity, which helps to more accurately extract the periodic characteristics of tension and vibration intensity in the subsequent process, so as to more accurately obtain the chain looseness in different periods during the overhead ground wire lifting process, and achieve more accurate control and adjustment of the tightening force in the tensioner; At the same time, the present application accurately evaluates the interference of wind force on the chain during high-altitude operations based on the frequent changes in chain tension and violent shaking characteristics in the short period of time before the current moment, and accurately evaluates the downward trend characteristics of the contraction force on the chain based on the trend characteristics of the chain tension and the trend characteristics of the vibration intensity at adjacent sampling moments of the current moment, which is conducive to timely control and adjustment of the tensioning force in the tensioner at the current moment, avoiding the accidental slipping of the overhead ground wire due to the failure of the tensioner to tighten and brake in time, and improving the timeliness of the tightening and braking of the tensioner in the single-screw lifter; The present application combines the degree of wind interference on the chain in a single-screw lifter and the downward trend characteristics of the contraction force on the chain to more accurately evaluate the looseness of the chain during aerial operations, thereby more accurately feedback-adjusting the tightening force in the tensioner, avoiding the situation where insufficient tightening force may occur after the overhead ground wire is lifted, and improving the safety and reliability during the overhead ground wire lifting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1A flowchart of the steps of a control and adjustment method for an overhead ground wire single-screw lifter provided in the present application; Figure 2 Schematic diagram of the construction process of the tightening downward trend degree provided for this application. DETAILED DESCRIPTION

[0017] In order to further explain the technical means and effects adopted by the present application to achieve the predetermined invention purpose, the following is a detailed description of the control and adjustment method and system of an overhead ground wire single-screw lifter proposed in accordance with the present application, its specific implementation method, structure, features and effects, in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0018] Unless otherwise specified and limited, terms such as "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a circuit structure, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such articles or devices. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the article or device including the element. In addition, the term "and\or" used herein includes any and all combinations of one or more related listed items. All technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application.

[0019] The following is a detailed description of a specific scheme of a control and adjustment method and system for an overhead ground wire single-screw lifter provided by the present application in conjunction with the accompanying drawings.

[0020] See also Figure 1 , which shows a flowchart of a method for controlling and adjusting an overhead ground wire single-screw lifter provided by an embodiment of the present application, comprising the following steps: Step 1: Obtain the tension and vibration intensity of the chain during the lifting of the overhead ground wire.

[0021] As the lightning protection wire of the transmission line, the overhead ground wire is extremely important for the safe and stable operation of the power system. When the hardware at the hanging point of the overhead ground wire is severely worn, it is necessary to lift the overhead ground wire with a single-screw lifter and replace the hardware at the hanging point of the overhead ground wire.

[0022] In the process of lifting the overhead ground wire by a single-screw lifter, the tension and vibration intensity of the chain are sampled in real time using a tension sensor and a vibration sensor to obtain the tension and vibration intensity at each sampling moment during the lifting process of the overhead ground wire. In this embodiment, the sampling rates of the tension and vibration intensity are both 100 Hz. The implementer can set the sampling rate according to the specific situation, and this embodiment does not make any special limitation to this.

[0023] Step 2: Perform frequency domain transformation on the tension and vibration intensity to extract the variation period of the tension and vibration intensity.

[0024] The lifting of overhead ground wires is a high-altitude operation, which is generally easily affected by wind interference. When the tightening effect of the chain in the single-screw lifter is poor, the chain will vibrate significantly under the interference of the wind at high altitude, and the chain tension will show unstable characteristic changes. At this time, the risk of accidental slipping of the overhead ground wire is high, which will cause serious safety hazards during the lifting of the overhead ground wire. Therefore, it is necessary to analyze the wind interference characteristics of the chain in the single-screw lifter, so as to more accurately control and adjust the tightening force of the tensioner to ensure stability and safety during the lifting of the overhead ground wire.

[0025] Since the tightening force of the tensioner is at a relatively high level when the overhead ground wire is first lifted, the chain is tightened to a relatively high degree at this time, and has relatively high stability and safety. Therefore, during the initialization time of the overhead ground wire lifting, there is no need for additional control and adjustment of the tightening force of the tensioner. In this embodiment, the first 30 seconds of the overhead ground wire lifting is used as the initialization time, and the tightening force of the tensioner is not controlled and adjusted during the initialization time. The implementer can choose the length of the initialization time according to actual conditions.

[0026] In order to be able to control and adjust the tensioning force in the tensioner in a timely and accurate manner in the future, vectors consisting of the tension and vibration intensity at all historical sampling moments within a preset time before the current moment in chronological order are obtained as the tension vector and vibration intensity vector at the current moment. The preset time is 20s in this embodiment. The tension vector and vibration intensity vector reflect the change of tension and vibration intensity over time in a short period of time before the current moment. By analyzing the periodic change characteristics of tension and vibration intensity at historical sampling moments before the current moment, it is helpful to control and adjust the tightening force in the tensioner in a timely manner to avoid safety hazards caused by tension delay in the tensioner.

[0027] Further, the tension vector at the current moment is transformed in the frequency domain to obtain the amplitudes of all frequencies in the frequency domain, and the inverse of the frequency corresponding to the maximum amplitude is used as the tension change period in the short time before the current moment; accordingly, for the vibration intensity vector, the vibration change period in the short time before the current moment is obtained by fast Fourier transform. Preferably, in this embodiment, the variation periods of tension and vibration intensity are obtained respectively by using FFT fast Fourier transform, the tension vector at the current moment is used as the input of FFT fast Fourier transform, the amplitudes of all frequencies in the frequency domain of tension data are obtained by using FFT fast Fourier transform, and the inverse of the frequency corresponding to the maximum amplitude is used as the tension change period in the short time before the current moment; accordingly, for the vibration intensity vector, the vibration change period in the short time before the current moment is extracted by using FFT fast Fourier transform, wherein FFT fast Fourier transform is a well-known technology, and the specific process is not repeated.

[0028] The use of FFT fast Fourier transform to obtain the changing cycle of tension and vibration intensity will help to more accurately extract the periodic characteristics of tension and vibration intensity in the future, so as to more accurately obtain the chain tightening degree in different periods during the overhead ground wire lifting process for analysis, and achieve more accurate control and adjustment of the tensioning force in the tensioner.

[0029] Step 3: The degree of wind interference on the chain in the single-screw lifter is obtained by analyzing the intensity characteristics of the frequent changes in the tension on the chain in the single-screw lifter in each change cycle and the severity of the change in vibration intensity over time.

[0030] In order to analyze the tension cycle characteristics and vibration cycle characteristics of the chain in the single-screw lifter in each change cycle, the tension in each tension change cycle before the current moment is arranged in ascending time order to form a tension cycle vector of each tension change cycle. Accordingly, for the vibration intensity in each vibration cycle, the vector composed of the vibration intensity in each vibration change cycle before the current moment arranged in ascending time order is used as the vibration cycle vector of each vibration change cycle.

[0031] The tension period vector and the vibration period vector respectively reflect the changing characteristics of the tension and the changing characteristics of the vibration intensity in each change cycle. If the tension changes more frequently and the vibration intensity changes more violently over time within the change cycle, it indicates to a certain extent that the stability of the chain within the change cycle is worse, and there is a higher risk of accidental slippage of the overhead ground wire, and it is necessary to timely control and adjust the tensioning force in the tensioner.

[0032] Furthermore, for each tension periodic vector, the first-order difference sequence of the tension periodic vector is obtained, the number of all non-zero elements in the first-order difference sequence is counted, recorded as the change frequency, and the mean of the absolute values ​​of all non-zero elements in the first-order difference sequence is calculated, recorded as the average change amplitude, and the product of the change frequency and the average change amplitude is taken as the tension change degree in each tension change period. The tension change degree reflects the intensity characteristics of the frequent changes in the tension on the chain during the tension change period. The greater the intensity characteristics of the frequent changes in the tension on the chain, the more likely it is that the chain will be insufficiently tightened, and the tensioning force in the tensioner should be controlled and adjusted in a timely manner.

[0033] At the same time, the first-order difference sequence of the vibration period vector of each vibration change cycle is obtained, and the mean of the absolute values ​​of all elements in the first-order difference sequence of the vibration period vector is calculated as the vibration intensity of each vibration change cycle. The vibration intensity reflects the intensity of the change of vibration intensity over time in the vibration change cycle. The higher the intensity of the change of vibration intensity over time, the more it can reflect the violent vibration characteristics of the single-screw lifter affected by wind force when the chain tightening force is poor, and the more it needs to control and adjust the tensioning force in the tensioner.

[0034] Step 4: According to the correlation between the tension variation and the vibration severity in each variation cycle before the current moment, as well as the average level of tension variation and the average level of vibration severity, the degree of wind interference of the chain in the single-screw lift at the current moment is obtained.

[0035] When the chain in the single-screw lift is not tightened enough, the wind force in the high-altitude wind field will affect the changes in the tension and vibration intensity in the chain at the same time. If the correlation between the frequent changes in the intensity characteristics of the tension in a short period of time before the current moment and the severity of the vibration is stronger, and the instability of the chain in the single-screw lift in a short period of time is higher, it can be reflected that the interference characteristics of the chain caused by the wind in a short period of time before the current moment are stronger, and there is a higher risk of the overhead ground wire slipping.

[0036] Through the above analysis, the tension change degrees of all tension change cycles are arranged in ascending time order to form the tension change degree vector at the current moment, and the tension change degree vector reflects the periodic characteristics of the tension change degree of the chain in a short time before the current moment; at the same time, the vibration intensity of all vibration change cycles are arranged in ascending time order to form the vibration intensity vector at the current moment, and the vibration intensity vector reflects the periodic characteristics of the vibration intensity on the chain in a short time before the current moment.

[0037] Calculate the correlation between the tension change degree vector and the vibration severity vector after length alignment. The correlation degree can be measured by covariance or Pearson correlation coefficient. In this embodiment, covariance is selected to measure the correlation degree between the two vectors. The calculation of covariance is a well-known technology and the specific process will not be repeated. It should be noted that when calculating the correlation degree of the vectors, in order to maintain the alignment of the vector lengths, the number of elements in the tension change degree vector and the vibration severity vector corresponding to the current moment are counted respectively. If the number of elements in the two vectors is not equal, the vector with fewer elements is mean-filled so that the lengths of the tension change degree vector and the vibration severity vector are equal. The mean-filling process is a prior art and will not be repeated in this embodiment. The implementer may also use other existing filling methods, and this embodiment does not impose any special restrictions on this. If the elements in the two vectors are equal, no mean-filling process is required.

[0038] Through the above analysis, the degree of wind interference on the chain in the single-screw lifter at the current moment is calculated: ; In the formula, is the degree of wind interference on the chain in the single-screw lifter at the current moment, is the correlation between the tension change degree vector and the vibration severity vector at the current moment, wherein the tension change degrees of all tension change cycles are arranged in ascending time order to form the tension change degree vector at the current moment, and the vibration severity degrees of all vibration change cycles are arranged in ascending time order to form the vibration severity vector at the current moment, is the mean value of the elements in the tension change vector at the current moment, is the mean value of the elements in the vibration severity vector at the current moment.

[0039] The wind cycle interference degree on the chain in the single-screw lift reflects the characteristics of the influence of wind interference when the chain tightening force is poor. The lower the chain tightening degree, the more susceptible it is to interference from the wind force at high altitudes. At this time, it is more necessary to control and adjust the tightening force in the tensioner to reduce safety hazards during the lifting process of the overhead ground wire.

[0040] Step 5: Analyze the downward trend of chain tension and the upward trend of vibration intensity at multiple adjacent sampling moments at the current moment, construct the tightening downward trend degree of the chain at the current moment, and combine the degree of wind interference of the chain in the single-screw lifter to obtain the chain looseness of the single-screw lifter at the current moment. Utilize the change difference of chain looseness, the tightening force in the tightening device at the current moment, and the preset tightening force adjustment amount to obtain the feedback tightening force in the tightening device at the current moment.

[0041] At the same time, when the overhead ground wire is lifted, if the tightening force on the chain in the single-screw lifter decreases, the tension of the chain will show a downward trend in the adjacent time, and the vibration intensity of the chain will show an upward trend in the adjacent time. Therefore, if the tension in the adjacent sampling time period at the current moment shows a stronger downward trend, and the vibration intensity shows a stronger upward trend, the more it can reflect the characteristics of the decrease in the tightening force of the chain in the single-screw lifter at the current moment, and the tightening force in the tensioner should be controlled and adjusted in a timely manner.

[0042] Furthermore, the K moments with the shortest time intervals to the current moment are taken as K adjacent sampling moments of the current moment. In this embodiment, the value of K is 50, and the implementer can select it according to the actual situation.

[0043] The chain tension and vibration intensity at the K adjacent sampling moments at the current moment are respectively composed of vectors in ascending time order as the tension trend vector and vibration trend vector at the current moment, and the first-order difference vectors of the tension trend vector and the vibration trend vector at the current moment are calculated respectively. The sum of the absolute values ​​of all negative values ​​in the first-order difference vector of the tension trend vector is taken as the tension downward trend amount at the current moment, and the sum of all positive values ​​in the first-order difference vector of the vibration trend vector is taken as the vibration upward trend amount at the current moment. The product of the tension downward trend amount at the current moment and the vibration upward trend amount is taken as the tightening downward trend degree of the chain at the current moment. The tightening downward trend degree reflects the downward trend characteristics of the tightening force on the chain between adjacent sampling moments. If the downward trend characteristics of the tightening force on the chain are stronger, and the degree of wind interference of the chain in the single-screw lifter is higher at this time, the low tightening degree of the chain can be more reflected. At this time, the tightening force in the tensioner should be increased in time to avoid the risk of accidental slippage of the overhead ground wire. Specifically, the construction process diagram of the tightening downward trend degree on the chain at the current moment is as follows: Figure 2 shown.

[0044] Further, this embodiment calculates the chain looseness of the single-screw lifter at the current moment through the above analysis: ; In the formula, is the chain looseness of the single screw lifter at the current moment, is an exponential function with a natural constant as base, is the degree of wind interference on the chain in the single-screw lifter at the current moment, It is the degree of tightening downward trend on the chain at the current moment.

[0045] Chain looseness reflects the characteristic of low chain tightening in the single-screw lift. The lower the chain tightening in the single-screw lift, the higher the force required to adjust the tensioner in the tensioner to avoid the risk of the overhead ground wire slipping.

[0046] The tension sensor is used to obtain the tension force in the tensioner at the current moment, and combined with the change in chain looseness, the feedback tension force in the tensioner at the current moment is calculated: ; In the formula, is the feedback tension force in the tensioner at the current moment, is the tension force in the tensioner at the current moment, is the chain looseness at the current moment, is the chain looseness at the sampling moment before the current moment, To preset the tension adjustment amount, in order to avoid excessive adjustment force and damage to the chain, the tension adjustment amount should not exceed 10% of The value range of is 0-10%*Nc. In this embodiment, the adjustment amount is set to 5%*Nc.

[0047] Therefore, during the lifting process of the overhead ground wire, the looseness of the chain in the single-screw lifter at the current moment is larger than the looseness corresponding to the previous sampling moment, indicating that the tightening force on the chain is insufficient at this time. At this time, the tightening force in the tensioner is appropriately adjusted upward to ensure a better tightening effect in the tensioner, thereby avoiding the accidental slipping of the ground wire due to the failure of the tensioner to tighten and brake in time, thereby improving the safety and reliability of the overhead ground wire lifting process; conversely, the looseness of the chain in the single-screw lifter at the current moment is smaller than the looseness corresponding to the previous sampling moment, indicating that the tightening force on the chain is sufficient at this time, and the tightening degree of the chain can be continuously increased. At this time, the tightening force in the tensioner is appropriately adjusted downward to avoid excessive tightening force in the tensioner, which may cause the risk of chain breakage in the single-screw lifter.

[0048] Step 6: Based on the feedback tensioning force and actual tensioning force in the tensioner at the current moment, the tensioning force of the tensioner is controlled and adjusted using a PID controller.

[0049] In order to accurately control the tensioning force in the tensioner, the feedback tensioning force and the actual tensioning force in the tensioner at the current moment are input into the PID controller. The PID controller adjusts the tensioning force in the tensioner by calculating the error between the feedback tensioning force and the actual tensioning force. The output of the PID controller is a control signal of the tensioning force in the tensioner. The drive motor in the tensioner controls the tensioning force of the tensioner according to the control signal to approach the feedback tensioning force corresponding to the current moment, thereby realizing the control and adjustment of the tensioning force in the tensioner in the single-screw lifter.

[0050] Based on the same inventive concept as the above-mentioned method, an embodiment of the present application also provides an overhead ground wire single-lead screw lifter control and adjustment system, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, and when the processor executes the computer program, it implements the steps of any one of the above-mentioned methods for controlling and adjusting an overhead ground wire single-lead screw lifter.

[0051] It is to be understood that the sequence of the embodiments of the present application described above is for description only and does not represent the advantages and disadvantages of the embodiments. The above describes specific embodiments of the present specification. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0052] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0053] The above content is only an implementation method of the present application and is not intended to limit the scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the protection scope of the present application.

Claims

1. A control and adjustment method for an overhead ground wire single screw lifter, characterized in that: The following steps are involved: Obtain the chain tension and vibration intensity during the overhead ground wire lifting process; Perform frequency domain transformation on tension and vibration intensity to extract the variation period of tension and vibration intensity; By analyzing the degree of frequent changes in the tension of the chain in the single-screw lifter in each change cycle and the severity of the change in vibration intensity over time, the tension change degree and vibration severity are constructed respectively; According to the correlation between the tension change degree and the vibration severity in each change cycle before the current moment, as well as the average level of the tension change degree and the average level of the vibration severity, the wind interference degree of the chain in the single-screw lift at the current moment is obtained; Analyze the downward trend of chain tension and the upward trend of vibration intensity at multiple adjacent sampling moments at the current moment, construct the downward trend of tightening on the chain at the current moment, and combine the degree of wind interference of the chain in the single-screw lifter to obtain the chain looseness of the single-screw lifter at the current moment. Use the change difference of chain looseness and the tightening force in the tightening device at the current moment and the preset tightening force adjustment amount to obtain the feedback tightening force in the tightening device at the current moment; According to the feedback tightening force and actual tightening force in the tightening device at the current moment, the tightening force of the tightening device is controlled and adjusted by using a PID controller.

2. A method for controlling and adjusting an overhead ground wire single screw lifter according to claim 1, characterized in that: The extraction of the variation cycle of the tension and vibration intensity further includes: Obtain the vectors composed of the tension and vibration intensity at all historical sampling moments within a preset time before the current moment in chronological order, as the tension vector and vibration intensity vector at the current moment; The tension vector at the current moment is transformed in the frequency domain to obtain the amplitudes of all frequencies in the frequency domain, and the inverse of the frequency corresponding to the maximum amplitude is taken as the tension change period in the short time before the current moment; accordingly, for the vibration intensity vector, the fast Fourier transform is used to obtain the vibration change period in the short time before the current moment.

3. The method for controlling and adjusting an overhead ground wire single screw lifter according to claim 1, characterized in that: The construction of the tension variation degree further includes: Arrange the tensions in each tension change period before the current moment in ascending order of time to form a tension period vector of each tension change period, and accordingly, obtain a vibration period vector of each vibration change period for the vibration intensity in each vibration period; For each tension periodic vector, the first-order difference sequence of the tension periodic vector is obtained, the number of all non-zero elements in the first-order difference sequence is counted, recorded as the change frequency, and the mean of the absolute values ​​of all non-zero elements in the first-order difference sequence is calculated, recorded as the average change amplitude, and the product of the change frequency and the average change amplitude is taken as the tension change degree in each tension change period.

4. A method for controlling and adjusting an overhead ground wire single screw lifter as claimed in claim 3, characterized in that: The construction of the vibration severity further includes: For each vibration period vector, the mean of the absolute values ​​of all elements in the first-order difference sequence of the vibration period vector is calculated as the vibration severity of each vibration change period.

5. The method for controlling and adjusting an overhead ground wire single-screw lifter according to claim 4, characterized in that: The corresponding calculation formula for the wind interference degree of the chain in the single-screw lifter at the current moment is: ; In the formula, is the degree of wind interference on the chain in the single-screw lifter at the current moment, is the correlation between the tension change degree vector and the vibration severity vector at the current moment, wherein the tension change degrees of all tension change cycles are arranged in ascending time order to form the tension change degree vector at the current moment, and the vibration severity degrees of all vibration change cycles are arranged in ascending time order to form the vibration severity vector at the current moment, is the mean value of the elements in the tension change vector at the current moment, is the mean value of the elements in the vibration severity vector at the current moment.

6. The method for controlling and adjusting an overhead ground wire single-screw lifter according to claim 1, characterized in that: The construction of the tightening downward trend degree on the chain at the current moment includes: The multiple moments with the closest time intervals to the current moment are all used as adjacent sampling moments of the current moment, and the tension downward trend amount and the vibration upward trend amount of the current moment are obtained according to the chain tension change and vibration intensity change at the multiple adjacent sampling moments; The product of the downward trend of tension at the current moment and the upward trend of vibration is determined as the downward trend degree of tightening on the chain at the current moment.

7. A method for controlling and adjusting an overhead ground wire single-screw lifter as claimed in claim 6, characterized in that: The tension downward trend amount and vibration upward trend amount at the current moment further include: Arranging the chain tension and vibration intensity at the plurality of adjacent sampling moments in ascending order of time to form a tension trend vector and a vibration trend vector at the current moment, and calculating the first-order difference vector of the tension trend vector and the vibration trend vector at the current moment respectively; The sum of the absolute values ​​of all negative values ​​in the first-order difference vector of the tension trend vector is taken as the tension downward trend quantity at the current moment, and the sum of all positive values ​​in the first-order difference vector of the vibration trend vector is taken as the vibration upward trend quantity at the current moment.

8. The method for controlling and adjusting an overhead ground wire single-screw lifter according to claim 1, characterized in that: The calculation process of the chain looseness of the single-screw lifter at the current moment is: ; In the formula, is the chain looseness of the single screw lifter at the current moment, is an exponential function with a natural constant as base, is the degree of wind interference on the chain in the single-screw lifter at the current moment, It is the degree of tightening downward trend on the chain at the current moment.

9. The method for controlling and adjusting an overhead ground wire single-screw lifter according to claim 1, characterized in that: The calculation process of the feedback tensioning force in the tensioner at the current moment is: ; In the formula, is the feedback tension force in the tensioner at the current moment, is the tension force in the tensioner at the current moment, is the chain looseness at the current moment, is the chain looseness at the sampling moment before the current moment, is the preset tension adjustment amount, where the tension adjustment amount does not exceed 10% of.

10. An overhead ground wire single-screw lifter control and adjustment system, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 9 are implemented.

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