Chain tension dynamic adjustment method and system

Abstract

The invention discloses a chain tension dynamic adjusting method and system, and relates to the technical field of reversed loader control, and the method comprises the following steps: obtaining start-stop information of a reversed loader; when the start-stop information is in a shutdown state, a telescopic oil cylinder of the reversed loader is controlled to be in a complete contraction state; when the start-stop information is in a start-up state, calculation processing is carried out based on basic parameters and material parameters of the reversed loader, and real-time transportation volume parameters of the reversed loader are obtained; and performing automatic telescopic control on a telescopic oil cylinder of the reversed loader based on the real-time transportation volume parameter. According to the method, when the scraper reversed loader is started, the chain is automatically tensioned to be in a working state, when the scraper reversed loader is stopped for a long time, the pre-tightening force of the chain is automatically reduced to be in a loose protection state, the chain is prevented from being in a tensioned state for a long time, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of transfer machine control, and in particular to a method and system for dynamically adjusting chain tensioning force. Background Art

[0002] During the operation of the scraper transfer machine, the chain will produce a certain elastic deformation due to the force. The deformation is closely related to the force state. As the amount of coal transported by the transfer machine changes, the force state of the chain changes, and the total deformation of the chain also changes accordingly. At present, there is no mature and available automatic tensioning technology for the scraper transfer machine chain. The chain tensioning force is not appropriate, which seriously affects the service life of the chain and sprocket. Summary of the invention

[0003] In view of this, the present invention provides a method and system for dynamically adjusting chain tension, the main purpose of which is to solve the current problem of lack of automatic chain tensioning technology for scraper transfer machines, inappropriate chain tensioning, and serious impact on the service life of chains and sprockets.

[0004] In order to solve the above problems, the present application provides a method for dynamically adjusting chain tension, comprising:

[0005] Get the start and stop information of the transfer machine;

[0006] When the start-stop information is in the stop state, the telescopic cylinder controlling the transfer machine is in a fully retracted state;

[0007] When the start-stop information is in the start-up state, the real-time transport volume parameters of the transfer machine are obtained by calculation based on the basic parameters of the transfer machine and the material parameters;

[0008] The telescopic cylinder of the loader is automatically extended and retracted based on the real-time transport volume parameters.

[0009] Optionally, the real-time transport volume parameters of the transfer machine are obtained by performing calculations based on the basic parameters of the transfer machine and the material parameters, including:

[0010] Calculating and processing based on a first distance value between the target material and the predetermined scanning device and a second distance value between the predetermined scanning device and the middle plate of the middle slot of the landing section of the transfer machine to obtain a stacking height of the target material;

[0011] Calculating and processing based on the stacking height and the first distance value to obtain the cross-sectional area of ​​the target material;

[0012] The total volume of the target material is obtained by calculating and processing based on the number of times the target material is scanned by the predetermined scanning device during the entire transportation process on the transfer machine, the third distance value of two consecutive scans of the target material, and the cross-sectional area;

[0013] Calculating and processing based on the predetermined specific gravity and total volume of the target material to obtain the total weight of the target material;

[0014] The real-time transport volume parameters of the transfer machine at the current moment are obtained by performing calculations based on the total volume, total weight, the number of scans at the current moment, and the scheduled transport duration.

[0015] Optionally, before automatically controlling the telescopic cylinder of the transfer machine based on the real-time transport volume parameter, the method further includes: determining a reference control parameter corresponding to each transport volume parameter of the transfer machine;

[0016] Determine the benchmark control parameters corresponding to each transport volume parameter of the transfer machine, including:

[0017] The first gap between the measuring chain and the bottom plate of the lower chainway during the conveying process of the collection and transfer machine for materials with different transport parameters;

[0018] When the first gap is greater than or equal to a first preset threshold and less than or equal to a second preset threshold, the first pressure, the first displacement and the first real-time torque of the current head telescopic cylinder are determined as reference control parameters;

[0019] When the first gap is less than a first preset threshold or the first gap is greater than a second preset threshold, adjusting the first pressure, the first displacement and the first real-time torque to update the first gap;

[0020] Until the adjusted first gap is greater than or equal to the first preset threshold and less than or equal to the second preset threshold, the adjusted first pressure, first displacement and first real-time torque of the head telescopic cylinder are determined as benchmark control parameters to obtain benchmark control parameters corresponding to each different transport volume parameter.

[0021] Optionally, the telescopic cylinder of the transfer machine is automatically extended and retracted based on the real-time transport volume parameters, including:

[0022] Based on the real-time traffic volume parameter, query each benchmark control parameter to obtain the target benchmark control parameter corresponding to the real-time traffic volume parameter;

[0023] Real-time monitoring to obtain the second gap between the measuring chain and the bottom plate of the lower chainway;

[0024] Determine whether the second gap meets a preset condition and obtain a determination result;

[0025] When the judgment result is that the second gap meets the preset condition, the target reference control parameter of the cylinder calibration is maintained unchanged;

[0026] When the judgment result is that the second gap does not meet the preset condition, the target reference control parameter is adjusted to automatically control the telescopic cylinder of the transfer machine.

[0027] Optionally, when the judgment result is that the second gap does not meet the preset condition, the target reference control parameter is adjusted to automatically control the telescopic cylinder of the transfer machine to extend and retract, specifically including:

[0028] When the second gap is smaller than the first preset threshold, a calculation is performed based on the current cylinder stroke parameter and the preset proportional coefficient to obtain a first contraction stroke parameter;

[0029] Controlling to increase the first pressure and the first displacement of the target reference control parameter so that the head oil cylinder extends out by a first retracting stroke parameter;

[0030] Re-monitor and measure the third gap between the chain and the bottom plate of the lower chainway;

[0031] When the third gap is greater than the first preset threshold and less than the second preset threshold, the telescopic cylinder of the transfer machine is controlled based on the increased first pressure and the first displacement;

[0032] When the third gap is smaller than the first preset threshold, the control increases the first pressure and the first displacement until the distance value between the measured chain and the bottom plate of the lower chainway is greater than the first preset threshold and less than the second preset threshold, the head telescopic cylinder is controlled to stop moving and the chain is in the target tension state.

[0033] Optionally, when the judgment result is that the second gap does not meet the preset condition, the target reference control parameter is adjusted to automatically control the telescopic cylinder of the transfer machine to extend and retract, and further includes:

[0034] When the second gap is greater than a second preset threshold, a calculation is performed based on the current cylinder stroke parameter and a preset proportional coefficient to obtain a second contraction stroke parameter;

[0035] Controlling to reduce the first pressure and the first displacement of the target reference control parameter so that the head oil cylinder contracts by a second contraction stroke parameter;

[0036] Re-monitor and measure the fourth gap between the chain and the bottom plate of the lower chainway;

[0037] When the fourth gap is greater than the first preset threshold and less than the second preset threshold, the telescopic cylinder of the transfer machine is controlled based on the first pressure and the first displacement after the control reduction;

[0038] When the fourth gap is greater than the second preset threshold, the control is to reduce the first pressure and the first displacement until the distance value between the measured chain and the lower chainway bottom plate is greater than the first preset threshold and less than the second preset threshold, the head telescopic cylinder is controlled to stop moving and the chain is in the target tension state.

[0039] In order to solve the above problems, the present application also provides a chain tensioning force dynamic adjustment system, which can dynamically adjust the tensioning force of the head chain based on the gap between the head chain and the lower chainway bottom plate, including:

[0040] A telescopic machine head, the telescopic machine head comprising a telescopic oil cylinder;

[0041] A gap recognition module is provided on the bottom plate of the lower chainway, and is used to obtain the gap parameters between the chain and the bottom plate of the lower chainway;

[0042] Laser scanner: The laser scanner is installed below the top plate of the trough in the middle of the landing section of the transfer machine. The laser scanner is used to obtain the stacking height of the target material;

[0043] An information collection module, which is used to obtain the pressure and displacement of the telescopic cylinder of the transfer machine;

[0044] An analysis control module, the analysis control module signal is connected to the telescopic cylinder, the gap recognition module, the laser scanner and the information collection module, and the analysis control module is used for automatically controlling the telescopic cylinder of the transfer machine.

[0045] Optionally, the telescopic head also includes:

[0046] Fixed slot;

[0047] The telescopic frame is arranged along the transport direction of the transfer machine, the telescopic frame is overlapped on the fixed groove, and the telescopic frame is used to connect with the sprocket shaft assembly;

[0048] Among them, the fixed end of the telescopic oil cylinder is connected to the fixed groove, and the driving end of the telescopic oil cylinder is connected to the telescopic frame.

[0049] Optionally, the analysis control module further includes:

[0050] An information collection module, which is used to receive the start and stop information of the transfer machine, the basic parameters and material parameters of the transfer machine, the gap parameters between the chain and the bottom plate of the lower chainway, and the real-time transport volume parameters of the transfer machine;

[0051] A calculation control module, which is used to analyze the chain tension according to the information acquisition module and convert it into a control signal;

[0052] An information output module, the information output module is used to transmit the control signal to the telescopic cylinder;

[0053] The data feedback module is used to feed back the gap parameters between the chain and the bottom plate of the lower chainway to the calculation control module after the telescopic cylinder of the transfer machine is automatically extended and retracted.

[0054] Optionally, the gap recognition module is an infrared ranging sensor.

[0055] The beneficial effects of the technical solution provided by the embodiment of the present invention include at least: the present application obtains the start and stop information of the transfer machine; when the start and stop information is in the shutdown state, the telescopic cylinder of the transfer machine is controlled to be in a fully retracted state; the chain is in a completely relaxed state, the excess load of the chain is eliminated, and the service life of the chain is extended. When the start and stop information is in the startup state, the real-time transport volume parameters of the transfer machine are obtained by calculation and processing based on the basic parameters and material parameters of the transfer machine; the telescopic cylinder of the transfer machine is automatically telescoped based on the real-time transport volume parameters. Automatic telescopic control of the telescopic cylinder of the head is realized. When the scraper transfer machine is started, the chain is automatically tensioned to put it in a working state. When the scraper transfer machine is stopped for a long time, the chain preload is automatically reduced to put it in a relaxed protection state, so as to avoid plastic deformation of the chain in a tensioned state for a long time, so as to extend the service life of the equipment.

[0056] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0058] Figure 1 A schematic diagram of a process of dynamically adjusting a chain tensioning force provided in an embodiment of the present application is shown;

[0059] Figure 2 A schematic flow chart of a method for dynamically adjusting chain tensioning force provided in another embodiment of the present application is shown;

[0060] Figure 3 A schematic structural diagram of a retractable head of a transfer machine of a chain tension dynamic adjustment system provided in an embodiment of the present application is shown;

[0061] Figure 4 A schematic diagram showing the installation of a gap identification module of a chain tensioning force dynamic adjustment system provided in an embodiment of the present application is shown;

[0062] Figure 5 A schematic diagram of the installation of a laser scanner of a chain tensioning force dynamic adjustment system provided in an embodiment of the present application is shown.

[0063] in, Figures 3 to 5 The corresponding relationship between the reference numerals and the component names is as follows:

[0064] 1 telescopic head, 11 telescopic oil cylinder, 12 fixed slot, 13 telescopic frame, 14 sprocket shaft assembly, 2 gap recognition module, 3 lower chainway bottom plate, 4 laser scanner, 5 top plate of the middle slot of the landing section of the transfer machine. DETAILED DESCRIPTION

[0065] Various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0066] It should be understood that various modifications may be made to the embodiments of the present application. Therefore, the above description should not be considered as limiting, but only as an example of an embodiment. Other modifications within the scope and spirit of the present application will occur to those skilled in the art.

[0067] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present application and, together with the general description of the present application given above and the detailed description of the embodiments given below, serve to explain the principles of the present application.

[0068] These and other characteristics of the present application will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0069] It should also be understood that although the present application has been described with reference to some specific examples, those skilled in the art will be able to readily implement many other equivalent forms of the present application.

[0070] The above and other aspects, features and advantages of the present application will become more apparent in view of the following detailed description when taken in conjunction with the accompanying drawings.

[0071] Specific embodiments of the present application are described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments applied for are merely examples of the present application, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that obscure the present application. Therefore, the specific structural and functional details applied for herein are not intended to be limiting, but merely serve as a basis and representative basis for the claims to teach those skilled in the art to use the present application in a variety of ways with substantially any suitable detailed structure.

[0072] This specification may use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," all of which may refer to one or more of the same or different embodiments according to the present application.

[0073] The embodiment of the first aspect of the present application provides a method for dynamically adjusting the tension of a chain, such as Figure 1 As shown, including:

[0074] Step S101: obtaining the start and stop information of the transfer machine;

[0075] In the specific implementation process of this step, first determine whether the scraper transfer machine is turned on. The calculation control module determines whether the transfer machine is in the start-up and running state based on the start-up and stop information of the scraper transfer machine collected by the information acquisition module. If the transfer machine is in the shutdown state, the head telescopic cylinder is controlled to be in a fully retracted state, that is, the cylinder pressure P = 0, the cylinder displacement S = 0, so that the chain is in a completely relaxed state, eliminating the excess load of the chain and extending the service life of the chain. If the transfer machine is in the start-up state, the automatic tensioning control system of the scraper transfer machine chain enters the automatic control mode. In the automatic control mode, the control system determines the tension of the transfer machine chain based on the real-time transportation volume of the transfer machine, the real-time torque of the transfer machine, the pressure and displacement information of the head telescopic cylinder, and controls the automatic extension and retraction of the head telescopic cylinder.

[0076] Step S102: When the start / stop information is a shutdown state, the telescopic cylinder of the transfer machine is controlled to be in a fully retracted state;

[0077] During the specific implementation of this step, it is determined whether the transfer machine is in the on-state. If the transfer machine is in the stopped state, the head telescopic cylinder is controlled to be in a fully retracted state, that is, the cylinder pressure P=0, the cylinder displacement S=0, so that the chain is in a completely relaxed state, eliminating the excess load on the chain and extending the service life of the chain.

[0078] Step S103: when the start / stop information is in the start state, a calculation is performed based on the basic parameters of the transfer machine and the material parameters to obtain the real-time transport volume parameters of the transfer machine;

[0079] In the specific implementation of this step, when the start-stop information is in the on state, the stacking height of the target material is obtained based on the first distance value between the target material and the predetermined scanning device and the second distance value between the predetermined scanning device and the middle plate of the middle groove of the landing section of the transfer machine; the cross-sectional area of ​​the target material is obtained based on the stacking height and the first distance value; the total volume of the target material is obtained based on the number of times the target material is scanned by the predetermined scanning device during the entire transportation process on the transfer machine, the third distance value of two adjacent scans of the target material, and the cross-sectional area; the total weight of the target material is obtained based on the predetermined specific gravity of the target material and the total volume; the real-time transportation volume parameters of the transfer machine at the current moment are obtained based on the total volume, the total weight, the number of scans at the current moment, and the predetermined transportation time.

[0080] Step S104: Automatically controlling the telescopic cylinder of the transfer machine to extend and retract based on the real-time transport volume parameter.

[0081] In the specific implementation process of this step, a reference control parameter corresponding to the real-time transport volume parameter is obtained based on the real-time transport volume parameter; the reference control parameter is a control parameter obtained in advance by experiments, and the telescopic cylinder of the transfer machine is automatically telescopically controlled based on the reference control parameter and the real-time monitoring data during the transportation of the transfer machine. Specifically, the second gap between the measuring chain and the bottom plate of the lower chainway is obtained by real-time monitoring; it is determined whether the second gap meets the preset conditions to obtain a judgment result; when the judgment result is that the second gap meets the preset conditions, the target reference control parameter calibrated by the cylinder is maintained unchanged; when the judgment result is that the second gap does not meet the preset conditions, the target reference control parameter is adjusted to automatically telescopically control the telescopic cylinder of the transfer machine.

[0082] The present application obtains the start and stop information of the transfer machine; when the start and stop information is in the shutdown state, the telescopic cylinder of the transfer machine is controlled to be in a fully retracted state; the chain is in a completely relaxed state, the excess load of the chain is eliminated, and the service life of the chain is extended. When the start and stop information is in the startup state, the real-time transport volume parameters of the transfer machine are obtained based on the basic parameters and material parameters of the transfer machine; the telescopic cylinder of the transfer machine is automatically telescoped based on the real-time transport volume parameters. Automatic telescopic control of the telescopic cylinder of the machine head is realized. When the scraper transfer machine is started, the chain is automatically tensioned to put it in a working state. When the scraper transfer machine is stopped for a long time, the chain preload is automatically reduced to put it in a relaxed protection state to avoid plastic deformation of the chain in a tensioned state for a long time, so as to extend the service life of the equipment.

[0083] Another embodiment of the present application provides another method for dynamically adjusting the chain tensioning force, such as Figure 2 As shown, including:

[0084] Step S201: obtaining the start and stop information of the transfer machine;

[0085] In the specific implementation process of this step, it is first determined whether the scraper transfer machine is turned on. The computing control module determines whether the transfer machine is in the on-state based on the start and stop information of the scraper transfer machine collected by the information acquisition module. The start and stop information includes the stop state and the on state.

[0086] Step S202: When the start / stop information is a shutdown state, controlling the telescopic cylinder of the transfer machine to be in a fully retracted state;

[0087] During the specific implementation of this step, if the transfer machine is in a stopped state, the head telescopic cylinder is controlled to be in a fully retracted state, that is, the cylinder pressure P=0, the cylinder displacement S=0, so that the chain is in a completely relaxed state, eliminating excess load on the chain and extending the service life of the chain.

[0088] Step S203: determining the reference control parameters corresponding to the transport volume parameters of the transfer machine;

[0089] In the specific implementation process of this step, the determination of the reference control parameters corresponding to the transport volume parameters of the transfer machine specifically includes:

[0090] The first gap D1 between the measuring chain and the bottom plate of the lower chainway is collected during the conveying process of the transfer machine for materials with different transport parameters; when the first gap is greater than or equal to the first preset threshold and less than or equal to the second preset threshold, the first pressure, first displacement and first real-time torque of the current head telescopic cylinder are determined as the reference control parameters; the first preset threshold is U-10% mm; the value of U can be 5mm, U is the standard gap value between the chain and the bottom plate of the lower chainway, and the value of U is set according to the specific model of the loader in combination with the actual situation. The second preset threshold can be U+10% mm; when the first gap is less than the first preset threshold or the first gap is greater than the second preset threshold, the first pressure, the first displacement and the first real-time torque are adjusted to update the first gap; until the adjusted first gap is greater than or equal to the first preset threshold and less than or equal to the second preset threshold, the adjusted first pressure, first displacement and first real-time torque of the head telescopic cylinder are determined as the reference control parameters to obtain the reference control parameters corresponding to each different transport parameter. For example: the real-time torque T, pressure P and displacement S of the telescopic cylinder of the head corresponding to each section of the transport capacity are as follows: when the transfer machine operates at 10% of the transport capacity (the transfer machine transport capacity is 300t / h), the torque T1, the pressure P1 and the displacement S1 of the cylinder are obtained to ensure that the gap between the chain and the bottom plate of the lower chainway is D=U±10%mm (D=5±10%mm); when the transfer machine operates at 20% of the transport capacity (the transfer machine transport capacity is 600t / h), the torque T2, the pressure P2 and the displacement S2 of the cylinder are obtained to ensure that the gap between the chain and the bottom plate of the lower chainway is D=U±10%mm (D=5±10%mm); when the transfer machine operates at 30% of its capacity (transfer machine capacity is 900t / h), obtain torque T3, cylinder pressure P3 and displacement S3 to ensure that the gap between the chain and the bottom plate of the lower chainway is D=U±10%mm(D=5±10%mm); and so on, when the transfer machine operates at 100% of its capacity (transfer machine capacity is 3000t / h), obtain torque T10, cylinder pressure P10 and displacement S10 to ensure that the gap between the chain and the bottom plate of the lower chainway is D=U±10%mm(D=5±10%mm).

[0091] Step S204: when the start / stop information is in the start state, a calculation is performed based on the basic parameters of the transfer machine and the material parameters to obtain the real-time transport volume parameters of the transfer machine;

[0092] In the specific implementation process of this step, the stacking height Hi of the target material is obtained based on the first distance value Li between the target material and the predetermined scanning device and the second distance value H between the predetermined scanning device and the middle plate of the middle slot of the landing section of the transfer machine. The calculation formula of the stacking height Hi of the target material can be expressed as the following formula (1):

[0093] Hi=H-Li(1)

[0094] The cross-sectional area Ai of the target material is obtained by performing calculation based on the stacking height and the first distance value. The calculation formula of the cross-sectional area Ai of the target material can be expressed as the following formula (2):

[0095] Ai=∑bHi=∑b(H-Li)(2)

[0096] The total volume of the target material is obtained based on the number of times the target material is scanned by the predetermined scanning device during the entire transportation process on the transfer machine, the third distance value of two adjacent scans of the target material, and the cross-sectional area. Specifically, the scanning time interval of the laser coal volume scanner is t1, the length of the scraper transfer machine is L, and the scraper chain speed of the scraper transfer machine is v. Then the transportation time of the coal material on the transfer machine is T = L / v. During the transportation of the coal material on the transfer machine, the number of times the laser coal volume scanner scans the coal material is p = T / t1 = L / t1·v; the distance between two adjacent laser scans is h = v·t1. The mathematical formula for calculating the total volume of the target material can be expressed as follows:

[0097]

[0098] The total weight Q of the target material is obtained by performing calculation based on the predetermined specific gravity of the target material and the total volume. The mathematical expression of the total weight Q of the target material can be expressed as the following formula (4):

[0099]

[0100] Based on the total volume, the total weight, the number of scans at the current moment and the scheduled transportation time, the real-time transportation volume parameter of the transfer machine at the current moment is obtained. The calculation formula of the real-time transportation volume parameter W of the transfer machine can be shown as the following formula (5):

[0101]

[0102] The above formula (5) is modified to obtain the target calculation mathematical formula (6) of the real-time traffic volume parameter as shown in:

[0103]

[0104] Among them: W is the transport capacity of the transfer machine, and the value this time is: 3000t / h; ρ is the specific gravity of coal, and the value can be 0.9t / m3; b is the width of the small strip, and the value can be 0.01m; L is the length of the scraper transfer machine, and the value can be 60m; t1 is the scanning time interval of the laser coal volume scanner, and the value this time is: 1s; H is the distance between the scanner and the middle plate of the middle trough of the transfer machine, and the value can be 1m; Li is the distance between the coal material and the scanner, and the value can be 0.2~0.7m; v is the chain speed of the scraper transfer machine, and the value is 2m / s; p is the number of times the coal is scanned by the laser coal volume scanner, and the value can be 30; T is the transportation time, and the value can be 60S.

[0105] Step S205: querying each benchmark control parameter based on the real-time traffic volume parameter to obtain a target benchmark control parameter corresponding to the real-time traffic volume parameter;

[0106] During the specific implementation of this step, the target benchmark control parameters corresponding to the real-time transport volume parameters can be queried through the predetermined benchmark control parameters corresponding to the various transport volume parameters of the transfer machine. The target benchmark control parameters include the benchmark pressure control parameters, benchmark displacement control parameters and benchmark torque control parameters of the current head telescopic cylinder of the transfer machine at the current moment corresponding to the real-time transport volume parameters.

[0107] Step S206: real-time monitoring to obtain a second gap between the measuring chain and the bottom plate of the lower chainway;

[0108] During the specific implementation of this step, the second gap D2 between the chain and the bottom plate of the lower chainway is measured by an infrared distance measuring sensor.

[0109] Step S207: determining whether the second gap meets a preset condition, and obtaining a determination result;

[0110] During the specific implementation of this step, when the second gap is greater than or equal to the first preset threshold and less than or equal to the second preset threshold, the second gap meets the preset condition; when the second gap is less than the first preset threshold or the second gap is greater than the second preset threshold, the second gap does not meet the preset condition.

[0111] Step S208: When the judgment result is that the second gap meets the preset condition, the target reference control parameter calibrated by the oil cylinder is maintained unchanged;

[0112] During the specific implementation of this step, when the second gap is greater than or equal to the first preset threshold and less than or equal to the second preset threshold, it indicates that the chain is in an ideal tension state, the head telescopic cylinder stops moving, and the calibrated pressure P and displacement S of the cylinder are maintained unchanged.

[0113] Step S209: When the judgment result is that the second gap does not meet the preset condition, the target reference control parameter is adjusted to automatically control the telescopic cylinder of the transfer machine to extend and retract.

[0114] When the second gap is smaller than the first preset threshold, the first retraction stroke parameter is obtained by calculating based on the current cylinder stroke parameter and the preset proportional coefficient; the first pressure and the first displacement of the target reference control parameter are controlled to be increased so that the head cylinder extends out by the first retraction stroke parameter; the third gap between the measuring chain and the bottom plate of the lower chainway is re-monitored; when the third gap is larger than the first preset threshold and smaller than the second preset threshold, the telescopic cylinder of the transfer machine is controlled based on the increased first pressure and the first displacement; when the third gap is smaller than the first preset threshold, the first pressure and the first displacement are controlled to be increased until the distance value between the measuring chain and the bottom plate of the lower chainway is larger than the first preset threshold and smaller than the second preset threshold, the head telescopic cylinder is controlled to stop moving, and the chain is in the target tensioning state. When the second gap is smaller than the first preset threshold, it indicates that the chain is too loose, and the machine head cylinder is controlled to extend the cylinder stroke X×Y% (this cylinder stroke X=500mm, Y is 5), increase the cylinder displacement S, increase the cylinder pressure P, return to S7 again, measure the D value, until D=U±10%mm (D=5±10%mm), the machine head telescopic cylinder stops moving, and the chain is in an ideal tension state.

[0115] When the second gap is greater than the second preset threshold, the second retraction stroke parameter is obtained by calculating based on the current cylinder stroke parameter and the preset proportional coefficient; the first pressure and the first displacement of the target reference control parameter are controlled to be reduced so that the head cylinder contracts the second retraction stroke parameter; the fourth gap between the measuring chain and the bottom plate of the lower chainway is re-monitored; when the fourth gap is greater than the first preset threshold and less than the second preset threshold, the telescopic cylinder of the transfer machine is controlled based on the first pressure and the first displacement after control reduction; when the fourth gap is greater than the second preset threshold, the first pressure and the first displacement are controlled to be reduced until the distance value between the measuring chain and the bottom plate of the lower chainway is greater than the first preset threshold and less than the second preset threshold, the head telescopic cylinder is controlled to stop moving, and the chain is in the target tension state. When the second gap is greater than the second preset threshold, if D>U+10%mm (D>5+10%mm) at this time, it indicates that the chain is too tight, and the head cylinder is controlled to shrink the cylinder stroke by X×Y% (this cylinder stroke X=500mm, Y is 5), reduce the cylinder displacement S, reduce the cylinder pressure P, return to S7 again, measure the D value, until D=U±10%mm (D=5±10%mm), the head telescopic cylinder stops moving, and the chain is in an ideal tension state.

[0116] The present application obtains the start and stop information of the transfer machine; when the start and stop information is in the stop state, controls the telescopic cylinder of the transfer machine to be in a fully retracted state; determines the reference control parameters corresponding to each transport volume parameter of the transfer machine; when the start and stop information is in the start state, calculates and processes based on the basic parameters and material parameters of the transfer machine to obtain the real-time transport volume parameter of the transfer machine; queries each reference control parameter based on the real-time transport volume parameter to obtain the target reference control parameter corresponding to the real-time transport volume parameter; monitors and obtains the second gap between the measuring chain and the bottom plate of the lower chainway in real time; determines whether the second gap meets the preset condition and obtains the judgment result; when the judgment result is that the second gap meets the preset condition, maintains the target reference control parameter calibrated by the cylinder unchanged; when the judgment result is that the second gap does not meet the preset condition, adjusts the target reference control parameter to automatically control the telescopic cylinder of the transfer machine. If the transfer machine stops, the telescopic cylinder is fully retracted, and the chain is automatically loosened to eliminate the excess load of the chain. When the transfer machine is turned on, the control system determines the tension of the transfer machine chain according to the real-time transport volume of the transfer machine, the real-time torque of the transfer machine, the pressure and displacement information of the head telescopic cylinder, and controls the automatic extension and retraction of the head telescopic cylinder to compensate for the deformation of the chain, and finally realizes automatic tensioning of the chain, so that the chain is always in an ideal tension state. The chain tensioning force dynamic adjustment method of the present application can increase the service life of the equipment.

[0117] like Figures 3 to 5 As shown, the embodiment of the second aspect of the present application provides a chain tensioning force dynamic adjustment system, which can dynamically adjust the tensioning force of the head chain based on the gap between the head chain and the lower chainway bottom plate 3, including a telescopic head 1, a gap recognition module 2, a laser scanner 4, an information collection module and an analysis control module, and the telescopic head 1 includes a telescopic cylinder 11. The gap recognition module 2 is arranged on the lower chainway bottom plate 3, and the gap recognition module 2 is used to obtain the gap parameters between the chain and the lower chainway bottom plate 3. The laser scanner 4 is arranged below the middle slot capping plate 5 of the landing section of the transfer machine, and the laser scanner 4 is used to obtain the stacking height of the target material. The information collection module is used to obtain the pressure and displacement of the telescopic cylinder 11 of the transfer machine. The analysis control module signal is connected to the telescopic cylinder 11, the gap recognition module 2, the laser scanner 4 and the information collection module, and the analysis control module is used to automatically control the telescopic cylinder 11 of the transfer machine.

[0118] In the specific implementation process, the analysis control module is used to automatically control the telescopic cylinder 11 of the transfer machine according to the tension of the head chain.

[0119] In the specific implementation process, the telescopic head 1 also includes a fixed groove 12 and a telescopic frame 13. The telescopic frame 13 is arranged along the transportation direction of the transfer machine, and the telescopic frame 13 is overlapped on the fixed groove 12. The telescopic frame 13 is used to connect with the sprocket shaft group 14; wherein the sprocket shaft group 14 includes a head sprocket and a head chain, and the head chain circulates around the head sprocket to realize the transfer and transportation of coal. wherein the fixed end (cylinder body) of the telescopic oil cylinder 11 is relatively fixedly connected to the fixed groove 12, and the driving end of the telescopic oil cylinder 11 is connected to the telescopic frame 13.

[0120] Specifically, when the driving end of the telescopic cylinder 11 is extended, the telescopic frame 13 is driven to move away from the fixed groove 12, and the tension force on the head chain increases; when the driving end of the telescopic cylinder 11 is shortened, the telescopic frame 13 is driven to move closer to the fixed groove 12, and the tension force on the head chain decreases.

[0121] In the specific implementation process, the analysis and control module also includes an information collection module, a calculation control module, an information output module and a data feedback module. The information collection module is used to receive the start and stop information of the transfer machine, the basic parameters and material parameters of the transfer machine, the gap parameters between the chain and the lower chainway bottom plate 3, and the real-time transportation volume parameters of the transfer machine. The calculation control module is used to analyze the chain tension according to the information collection module and convert it into a control signal, so as to determine whether the head chain is at a suitable tension level and control the extension and contraction of the telescopic cylinder 11. The information output module is used to transmit the control signal to the telescopic cylinder 11, so as to control the telescopic cylinder 11 to perform the telescopic action, and then adjust the gap between the head chain and the lower chainway bottom plate 3. The data feedback module is used to feed back the gap parameters between the chain and the lower chainway bottom plate 3 to the calculation control module after the telescopic cylinder 11 of the transfer machine is automatically extended and contracted, so as to analyze and determine whether the head chain is at a suitable tension level again, and control the telescopic cylinder 11 to extend and contract again until the head chain is at a suitable tension level.

[0122] In a specific implementation process, the gap recognition module 2 may be an infrared ranging sensor.

[0123] The present application obtains the start and stop information of the transfer machine; when the start and stop information is in the shutdown state, the telescopic cylinder of the transfer machine is controlled to be in a fully retracted state; the chain is in a completely relaxed state, the excess load of the chain is eliminated, and the service life of the chain is extended. When the start and stop information is in the startup state, the real-time transport volume parameters of the transfer machine are obtained based on the basic parameters and material parameters of the transfer machine; the telescopic cylinder of the transfer machine is automatically telescoped based on the real-time transport volume parameters. Automatic telescopic control of the telescopic cylinder of the machine head is realized. When the scraper transfer machine is started, the chain is automatically tensioned to put it in a working state. When the scraper transfer machine is stopped for a long time, the chain preload is automatically reduced to put it in a relaxed protection state to avoid plastic deformation of the chain in a tensioned state for a long time, so as to extend the service life of the equipment.

[0124] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A method for dynamically adjusting the tension of a chain, applied to a transfer machine that uses a telescopic oil cylinder to drive the machine head to extend and retract, characterized in that: Specifically include: Obtaining the start and stop information of the transfer machine; When the start-stop information is in the shutdown state, the telescopic cylinder of the transfer machine is controlled to be in a fully retracted state; When the start / stop information is in the start state, the real-time transport volume parameters of the transfer machine are obtained by performing calculations based on the basic parameters and material parameters of the transfer machine; The telescopic cylinder of the transfer machine is automatically controlled to be telescopically extended and retracted based on the real-time transport volume parameters.

2. The method for dynamically adjusting the chain tensioning force according to claim 1, characterized in that: The calculation and processing based on the basic parameters and material parameters of the transfer machine to obtain the real-time transport volume parameters of the transfer machine specifically includes: Calculating and processing based on a first distance value between the target material and a predetermined scanning device and a second distance value between the predetermined scanning device and a middle plate of a middle slot of a landing section of the transfer machine to obtain a stacking height of the target material; Performing calculation based on the stacking height and the first distance value to obtain the cross-sectional area of ​​the target material; The total volume of the target material is obtained by calculating and processing based on the number of times the target material is scanned by the predetermined scanning device during the entire transportation process on the transfer machine, the third distance value of two adjacent scans of the target material, and the cross-sectional area; Performing calculation based on the predetermined specific gravity of the target material and the total volume to obtain the total weight of the target material; The real-time transport volume parameters of the transfer machine at the current moment are obtained by performing calculations based on the total volume, the total weight, the number of scans at the current moment, and the scheduled transport duration.

3. The method for dynamically adjusting the chain tensioning force according to claim 1, characterized in that: Before automatically controlling the telescopic cylinder of the transfer machine to extend and retract based on the real-time transport volume parameter, the method further includes: determining a reference control parameter corresponding to each transport volume parameter of the transfer machine; The step of determining the reference control parameters corresponding to the transport volume parameters of the transfer machine specifically includes: Collecting the first gap between the measuring chain and the bottom plate of the lower chainway during the conveying process of the transfer machine for materials with different transport parameters; When the first gap is greater than or equal to a first preset threshold and less than or equal to a second preset threshold, the first pressure, the first displacement and the first real-time torque of the current head telescopic cylinder are determined as reference control parameters; When the first gap is less than a first preset threshold or the first gap is greater than a second preset threshold, adjusting the first pressure, the first displacement and the first real-time torque to update the first gap; Until the adjusted first gap is greater than or equal to the first preset threshold and less than or equal to the second preset threshold, the adjusted first pressure, first displacement and first real-time torque of the head telescopic cylinder are determined as the benchmark control parameters to obtain the benchmark control parameters corresponding to each different transport volume parameter.

4. The method for dynamically adjusting the chain tensioning force according to claim 3, characterized in that: The automatic telescopic control of the telescopic cylinder of the transfer machine based on the real-time transport volume parameter specifically includes: Based on the real-time traffic volume parameter, query each benchmark control parameter to obtain a target benchmark control parameter corresponding to the real-time traffic volume parameter; Real-time monitoring to obtain the second gap between the measuring chain and the bottom plate of the lower chainway; Determine whether the second gap meets a preset condition and obtain a determination result; When the judgment result is that the second gap meets the preset condition, the target reference control parameter calibrated by the cylinder is maintained unchanged; When the judgment result is that the second gap does not meet the preset condition, the target reference control parameter is adjusted to automatically control the telescopic cylinder of the transfer machine to extend and retract.

5. The method for dynamically adjusting the chain tensioning force according to claim 4, characterized in that: When the judgment result is that the second gap does not meet the preset condition, the target reference control parameter is adjusted to automatically control the telescopic cylinder of the transfer machine to extend and retract, specifically including: When the second gap is smaller than the first preset threshold, a calculation is performed based on the current cylinder stroke parameter and a preset proportional coefficient to obtain a first contraction stroke parameter; Controlling to increase the first pressure and the first displacement of the target reference control parameter so that the head oil cylinder extends out by the first retraction stroke parameter; Re-monitor and obtain the third gap between the measuring chain and the bottom plate of the lower chainway; When the third gap is greater than the first preset threshold and less than the second preset threshold, the telescopic cylinder of the transfer machine is controlled based on the increased first pressure and the first displacement; When the third gap is smaller than the first preset threshold, the first pressure and the first displacement are controlled to be increased until the distance value between the measured chain and the bottom plate of the lower chainway is greater than the first preset threshold and less than the second preset threshold, and the head telescopic cylinder is controlled to stop moving and the chain is in the target tension state.

6. The method for dynamically adjusting the chain tensioning force according to claim 4, characterized in that: When the judgment result is that the second gap does not meet the preset condition, the target reference control parameter is adjusted to automatically control the telescopic cylinder of the transfer machine to extend and retract, and further includes: When the second gap is greater than the second preset threshold, a calculation process is performed based on the current cylinder stroke parameter and a preset proportional coefficient to obtain a second contraction stroke parameter; Controlling to reduce the first pressure and the first displacement of the target reference control parameter so that the head oil cylinder contracts by the second contraction stroke parameter; Re-monitor and measure the fourth gap between the chain and the bottom plate of the lower chainway; When the fourth gap is greater than the first preset threshold and less than the second preset threshold, the telescopic cylinder of the transfer machine is controlled based on the first pressure and the first displacement after the control reduction; When the fourth gap is greater than the second preset threshold, the first pressure and the first displacement are controlled to be reduced until the distance value between the measured chain and the bottom plate of the lower chainway is greater than the first preset threshold and less than the second preset threshold, and the head telescopic cylinder is controlled to stop moving and the chain is in the target tension state.

7. A chain tension dynamic adjustment system capable of dynamically adjusting the chain tension based on the gap between the chain and the lower chainway bottom plate (3), characterized in that: Specifically include: A telescopic machine head (1), wherein the telescopic machine head (1) comprises a telescopic oil cylinder (11); A gap identification module (12), the gap identification module (12) being arranged on the lower chainway bottom plate (3), the gap identification module (12) being used to obtain a gap parameter between the chain and the lower chainway bottom plate (3); A laser scanner (4), the laser scanner (4) being arranged below the top plate (5) of the middle slot of the landing section of the transfer machine, and the laser scanner (4) being used to obtain the stacking height of the target material; An information collection module, the information collection module being used to obtain the pressure and displacement of the telescopic cylinder (11) of the transfer machine; An analysis control module, wherein the analysis control module is signal-connected to the telescopic cylinder (11), the gap recognition module (12), the laser scanner (4) and the information collection module, and the analysis control module is used to automatically control the telescopic cylinder (11) of the transfer machine.

8. The chain tension dynamic adjustment system according to claim 7, characterized in that: The telescopic head (1) further comprises: A fixing groove (12); A telescopic frame (13), the telescopic frame (13) is arranged along the transport direction of the transfer machine, the telescopic frame (13) is overlapped with the fixed groove (12), and the telescopic frame (13) is used to connect with the sprocket shaft group (14); Wherein, the fixed end of the telescopic oil cylinder (11) is connected to the fixed groove (12), and the driving end of the telescopic oil cylinder (11) is connected to the telescopic frame (13).

9. The chain tension dynamic adjustment system according to claim 7, characterized in that: The analysis control module also includes: An information collection module, the information collection module is used to receive the start and stop information of the transfer machine, the basic parameters and material parameters of the transfer machine, the gap parameters between the chain and the lower chainway bottom plate (3) and the real-time transport volume parameters of the transfer machine; A calculation control module, the calculation control module is used to analyze the chain tensioning force according to the information acquisition module and convert it into a control signal; An information output module, the information output module being used to transmit the control signal to the telescopic cylinder (11); A data feedback module is used to feed back the gap parameter between the chain and the lower chainway bottom plate (3) to the calculation control module after the telescopic oil cylinder (11) of the transfer machine is automatically telescoped.

10. The chain tension dynamic adjustment system according to claim 7, characterized in that: The gap recognition module (12) is an infrared distance measuring sensor.

Images