A method and system for dynamic adjustment of chain tension

Abstract

This application discloses a method and system for dynamically adjusting chain tension, relating to the field of transfer conveyor control technology. The method includes acquiring the start-up and stop information of the transfer conveyor; when the start-up and stop information indicates a stop state, controlling the telescopic cylinder of the transfer conveyor to be in a fully retracted state; when the start-up and stop information indicates an start state, performing calculations based on the basic parameters and material parameters of the transfer conveyor to obtain the real-time conveying capacity parameters of the transfer conveyor; and automatically controlling the telescopic cylinder of the transfer conveyor to extend and retract based on the real-time conveying capacity parameters. This method automatically tensions the chain when the scraper transfer conveyor is started, putting it in a working state, and automatically reduces the chain pretension when the scraper transfer conveyor is stopped for a long time, putting it in a relaxed protective state, thus preventing the chain from undergoing plastic deformation due to prolonged tension and extending the service life of the equipment.

Description

Technical Field

[0001] This invention relates to the field of transfer machine control technology, and in particular to a method and system for dynamically adjusting chain tension. Background Technology

[0002] During operation, the chain of a scraper conveyor undergoes elastic deformation under stress. The amount of deformation is closely related to the stress state. As the amount of coal transported by the conveyor changes, the stress state of the chain changes, and the total deformation of the chain also changes accordingly. Currently, there is no mature and usable automatic chain tensioning technology for scraper conveyors. Inappropriate chain tension can seriously affect the service life of the chain and sprockets. Summary of the Invention

[0003] In view of this, the present invention provides a method and system for dynamic adjustment of chain tension, the main purpose of which is to solve the problem that the current scraper conveyor chain lacks automatic tensioning technology, resulting in unsuitable chain tension and seriously affecting the service life of the chain and sprocket.

[0004] To address the above problems, this application provides a method for dynamically adjusting chain tension, comprising:

[0005] Obtain start / stop information for the transfer machine;

[0006] When the start / stop information is in the stop state, the telescopic cylinder controlling the transfer machine is in the fully retracted state.

[0007] When the start / stop information indicates that the machine is in the start state, calculations are performed based on the basic parameters and material parameters of the transfer machine to obtain the real-time transport capacity parameters of the transfer machine.

[0008] The telescopic cylinders of the transfer machine are automatically extended and retracted based on real-time transport volume parameters.

[0009] Optionally, calculations are performed based on the basic parameters and material parameters of the transfer machine to obtain the real-time conveying capacity parameters of the transfer machine, specifically including:

[0010] The stacking height of the target material is obtained by calculating the first distance between the target material and the predetermined scanning device and the second distance between the predetermined scanning device and the middle plate of the trough in the landing section of the transfer machine.

[0011] The cross-sectional area of ​​the target material is obtained by calculation based on the stacking height and the first distance value.

[0012] The total volume of the target material is calculated 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 between two adjacent scans of the target material, and the cross-sectional area.

[0013] The total weight of the target material is obtained by calculating based on the predetermined specific gravity and total volume of the target material.

[0014] The real-time transport capacity parameters of the transshipment machine are obtained by calculating the total volume, total weight, number of scans at the current moment, and scheduled transport time.

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

[0016] Determine the baseline control parameters corresponding to each transport capacity parameter of the transfer machine, specifically including:

[0017] The first gap between the chain and the bottom plate of the lower chain track is measured during the material conveying process of the transfer machine for materials with different conveying parameters.

[0018] 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.

[0019] 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.

[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 machine head telescopic cylinder are determined as the reference control parameters, so as to obtain the reference control parameters corresponding to each different transport volume parameter.

[0021] Optionally, the telescopic cylinders of the transfer machine can be automatically controlled to extend and retract based on real-time transport volume parameters, specifically including:

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

[0023] Real-time monitoring is used to obtain the second gap between the measuring chain and the bottom plate of the lower chain track.

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

[0025] When the judgment result is that the second gap meets the preset conditions, the target reference control parameters of the hydraulic cylinder calibration remain unchanged;

[0026] When the judgment result indicates that the second gap does not meet the preset conditions, the target reference control parameters are adjusted to automatically control the extension and retraction of the transfer machine's telescopic cylinder.

[0027] Optionally, when the judgment result indicates that the second gap does not meet the preset conditions, the target reference control parameters are adjusted to automatically control the extension and retraction of the transfer machine's telescopic cylinder, specifically including:

[0028] When the second gap is less than the first preset threshold, the first retraction stroke parameter is obtained by calculation based on the current cylinder stroke parameter and the preset proportional coefficient.

[0029] The first pressure and first displacement of the target reference control parameters are increased, so that the cylinder head extends the first retraction stroke parameter;

[0030] The third gap between the chain and the bottom plate of the lower chain track was re-monitored and measured.

[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 first pressure and the first displacement after the control increase.

[0032] When the third gap is less than the first preset threshold, the control increases the first pressure and the first displacement until the distance between the measured chain and the bottom plate of the lower chain track is greater than the first preset threshold and less than the second preset threshold. Then the control stops the movement of the machine head telescopic cylinder and the chain is in the target tension state.

[0033] Optionally, when the judgment result indicates that the second gap does not meet the preset conditions, the target reference control parameters are adjusted to automatically control the extension and retraction of the telescopic cylinder of the transfer machine, and the adjustment also includes:

[0034] When the second gap is greater than the second preset threshold, the second retraction stroke parameter is obtained by calculation based on the current cylinder stroke parameter and the preset proportional coefficient.

[0035] The first pressure and the first displacement of the target reference control parameters are controlled to reduce the second contraction stroke parameter of the engine head cylinder;

[0036] The fourth gap between the measuring chain and the bottom plate of the lower chain track was re-monitored and measured.

[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 first pressure and the first displacement are reduced until the distance between the measured chain and the bottom plate of the lower chain track is greater than the first preset threshold and less than the second preset threshold. Then, the head extension cylinder is controlled to stop moving and the chain is in the target tension state.

[0039] To address the aforementioned problems, this application also provides a chain tension dynamic adjustment system, capable of dynamically adjusting the tension of the head chain based on the gap between the head chain and the lower chain track bottom plate, comprising:

[0040] Telescopic excavator head, which includes a telescopic hydraulic cylinder;

[0041] The gap recognition module is installed on the bottom plate of the lower chain track and is used to obtain the gap parameters between the chain and the bottom plate of the lower chain track.

[0042] The laser scanner is located 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] The information collection module is used to acquire the pressure and displacement of the telescopic cylinder of the transfer machine;

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

[0045] Optionally, the telescopic head also includes:

[0046] Fixed groove;

[0047] The telescopic frame is set along the transport direction of the transfer machine. The telescopic frame overlaps the fixed groove and is used to connect with the sprocket shaft assembly.

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

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

[0050] The information acquisition module is used to receive start and stop information of the transfer machine, basic parameters and material parameters of the transfer machine, gap parameters between the chain and the bottom plate of the lower chain track, and real-time conveying capacity parameters of the transfer machine.

[0051] The calculation and control module is used to analyze the chain tension based on the information acquisition module and convert it into control signals.

[0052] Information output module, used to transmit control signals to 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 chain track to the calculation and control module after the telescopic cylinder of the transfer machine is automatically telescopically controlled.

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

[0055] The beneficial effects of the technical solution provided by the embodiments of the present invention include at least the following: This application obtains the start-up and stop information of the transfer machine; when the start-up and stop information indicates a stop state, it controls the telescopic cylinder of the transfer machine to be in a fully retracted state; this allows the chain to be in a fully relaxed state, eliminating excess load on the chain and extending its service life. When the start-up and stop information indicates an start state, it performs calculations based on the basic parameters and material parameters of the transfer machine to obtain the real-time conveying capacity parameters of the transfer machine; based on the real-time conveying capacity parameters, it automatically controls the telescopic cylinder of the transfer machine to extend and retract. This achieves automatic extension and retraction control of the head telescopic cylinder. 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, preventing the chain from being in a tense state for a long time and causing plastic deformation, thereby extending the service life of the equipment.

[0056] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0057] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0058] Figure 1 A flowchart illustrating a method for dynamically adjusting chain tension according to an embodiment of this application is shown.

[0059] Figure 2 A flowchart illustrating a method for dynamically adjusting chain tension according to another embodiment of this application is shown.

[0060] Figure 3 This illustration shows a structural schematic diagram of the telescopic head of a transfer machine according to an embodiment of the present application for a chain tension dynamic adjustment system;

[0061] Figure 4 This illustration shows the installation diagram of the gap identification module of a chain tension dynamic adjustment system according to an embodiment of this application;

[0062] Figure 5 This illustration shows the installation diagram of a laser scanner for a chain tension dynamic adjustment system provided in an embodiment of this application.

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

[0064] 1 Telescopic head, 11 Telescopic cylinder, 12 Fixed groove, 13 Telescopic frame, 14 Sprocket shaft assembly, 2 Gap recognition module, 3 Lower chain track bottom plate, 4 Laser scanner, 5 Top plate of the middle groove of the transfer machine landing section. Detailed Implementation

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

[0066] It should be understood that various modifications can be made to the embodiments described herein. Therefore, the above description should not be considered as limiting, but merely as an example of embodiments. Other modifications within the scope and spirit of this application will be apparent to those skilled in the art.

[0067] The accompanying drawings, which are included in and form part of this 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 features of this application will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

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

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

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

[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 this application.

[0073] An embodiment of the first aspect of this application provides a method for dynamically adjusting chain tension, such as... Figure 1 As shown, it includes:

[0074] Step S101: Obtain the start / stop information of the transfer machine;

[0075] In this step, the first step is to determine whether the scraper conveyor is running. The calculation and control module uses the start / stop information of the scraper conveyor collected by the information acquisition module to determine whether the conveyor is in operation. If the conveyor is stopped, the head extension cylinder is controlled to be fully retracted, i.e., cylinder pressure P=0 and cylinder displacement S=0, so that the chain is fully relaxed, eliminating excess load on the chain and extending its service life. If the conveyor is running, the scraper conveyor chain automatic tensioning control system enters automatic control mode. In automatic control mode, the control system determines the chain tension based on the real-time conveyor capacity, real-time conveyor torque, and pressure and displacement information of the head extension cylinder, and controls the automatic extension and retraction of the head extension cylinder.

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

[0077] In this step, it is determined whether the transfer machine is running. If the transfer machine is stopped, the head extension cylinder is controlled to be fully retracted, that is, the cylinder pressure P=0 and the cylinder displacement S=0, so that the chain is fully relaxed, eliminating excess load on the chain and extending the chain's service life.

[0078] Step S103: When the start / stop information is in the power-on state, calculations are performed based on the basic parameters and material parameters of the transfer machine to obtain the real-time transport capacity parameters of the transfer machine;

[0079] In the specific implementation process of this step, when the start / stop information is in the power-on state, the stacking height of the target material is calculated 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 landing section of the transfer machine; the cross-sectional area of ​​the target material is calculated based on the stacking height and the first distance value; the total volume of the target material is calculated 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 between two adjacent scans of the target material, and the cross-sectional area; the total weight of the target material is calculated based on the predetermined specific gravity of the target material and the total volume; and the real-time transport capacity parameters of the transfer machine at the current moment are calculated based on the total volume, the total weight, the number of scans at the current moment, and the predetermined transport time.

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

[0081] In this step, a reference control parameter corresponding to the real-time transport volume parameter is obtained based on the real-time transport volume parameter. This reference control parameter is a control parameter obtained through prior experiments. The telescopic cylinder of the transfer machine is automatically telescopically controlled based on the reference control parameter and real-time monitoring data during the transfer machine's transport process. Specifically, a second gap between the measuring chain and the lower chain track bottom plate is obtained through real-time monitoring; it is determined whether the second gap meets a preset condition, and a judgment result is obtained; when the judgment result indicates that the second gap meets the preset condition, the target reference control parameter calibrated for the cylinder is kept unchanged; when the judgment result indicates that the second gap does not meet the preset condition, the target reference control parameter is adjusted to automatically telescopically control the telescopic cylinder of the transfer machine.

[0082] This application obtains the start-stop information of the transfer machine; when the start-stop information indicates a stopped state, it controls the telescopic cylinder of the transfer machine to be in a fully retracted state, thus fully relaxing the chain, eliminating excess load on the chain, and extending the chain's service life. When the start-stop information indicates an started state, it calculates and processes the basic parameters and material parameters of the transfer machine to obtain the real-time conveying capacity parameters of the transfer machine; based on the real-time conveying capacity parameters, it automatically controls the telescopic cylinder of the transfer machine to extend and retract. This achieves automatic extension and retraction control of the machine head telescopic cylinder. 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, preventing the chain from being in a tense state for a long time and causing plastic deformation, thereby extending the service life of the equipment.

[0083] Another embodiment of this application provides another method for dynamically adjusting chain tension, such as... Figure 2 As shown, it includes:

[0084] Step S201: Obtain the start / stop information of the transfer machine;

[0085] In the specific implementation process of this step, the first step is to determine whether the scraper conveyor is turned on. The calculation and control module determines whether the conveyor is in the running state based on the start and stop information of the scraper conveyor collected by the information acquisition module. The start and stop information includes the stop state and the start state.

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

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

[0088] Step S203: Determine the baseline control parameters corresponding to each transport capacity parameter of the transfer machine;

[0089] In the specific implementation of this step, determining the baseline control parameters corresponding to each transport capacity parameter of the transfer machine specifically includes:

[0090] The first gap D1 between the chain and the lower chain conveyor floor is measured during the material conveying process of the transfer machine with different conveying 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, first displacement, and first real-time torque of the current machine head telescopic cylinder are determined as the benchmark control parameters. The first preset threshold is U-10% mm; the value of U can be 5 mm, where U is the standard gap value between the chain and the lower chain conveyor floor, and the value of U is set according to the specific model of the loader and the actual situation. The second preset threshold can be U+10% mm. When the first gap is less than the first preset threshold or greater than the second preset threshold, the first pressure, first displacement, and 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 machine head telescopic cylinder are determined as the benchmark control parameters to obtain the benchmark control parameters corresponding to each different conveying parameter. For example, the real-time torque T, cylinder pressure P, and displacement S corresponding to each transport capacity are as follows: When the transfer machine is operating at 10% capacity (transfer machine capacity 300t / h), obtain the torque T1, cylinder pressure P1, and displacement S1 to ensure the gap D = U ± 10% mm (D = 5 ± 10% mm) between the chain and the lower track bottom plate; When the transfer machine is operating at 20% capacity (transfer machine capacity 600t / h), obtain the torque T2, cylinder pressure P2, and displacement S2 to ensure the gap D = U ± 10% mm between the chain and the lower track bottom plate. (D=5±10%mm); When the transfer machine is operating at 30% capacity (transfer machine capacity 900t / h), obtain torque T3, cylinder pressure P3 and displacement S3 to ensure the gap between the chain and the lower track bottom plate D=U±10%mm (D=5±10%mm); Similarly, when the transfer machine is operating at 100% capacity (transfer machine capacity 3000t / h), obtain torque T10, cylinder pressure P10 and displacement S10 to ensure the gap between the chain and the lower track bottom plate D=U±10%mm (D=5±10%mm).

[0091] Step S204: When the start / stop information is in the power-on state, calculations are performed based on the basic parameters and material parameters of the transfer machine to obtain the real-time transport capacity parameters of the transfer machine;

[0092] In this step, the stacking height Hi of the target material is calculated based on the first distance Li between the target material and the predetermined scanning device and the second distance H between the predetermined scanning device and the middle plate of the landing section of the transfer machine. The mathematical formula for calculating the stacking height Hi of the target material can be shown in the following formula (1):

[0093] Hi=H-Li(1)

[0094] Based on the stacking height and the first distance value, the cross-sectional area Ai of the target material is obtained through calculation. The mathematical formula for calculating the cross-sectional area Ai of the target material can be shown in the following formula (2):

[0095] Ai=∑bHi=∑b(H-Li)(2)

[0096] The total volume of the target material is calculated 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 between two adjacent scans of the target material, and the cross-sectional area. Specifically, the scanning time interval of the laser coal 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 process of the coal material on the transfer machine, the number of times it is scanned by the laser coal scanner 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 shown in the following formula (3):

[0097]

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

[0099]

[0100] Based on the total volume, the total weight, the number of scans at the current moment, and the predetermined transportation time, the real-time transport capacity parameter W of the transshipment machine at the current moment is obtained through calculation. The mathematical formula for calculating the real-time transport capacity parameter W of the transshipment machine can be shown in the following formula (5):

[0101]

[0102] The formula (5) above is transformed to obtain the target calculation formula (6) for the real-time traffic volume parameter, as shown in the following figure:

[0103]

[0104] Where: W is the conveyor capacity, taken as 3000 t / h in this case; ρ is the specific gravity of coal, which can be 0.9 t / m3; b is the width of the strip, which can be 0.01 m; L is the length of the scraper conveyor, which can be 60 m; t1 is the scanning time interval of the laser coal scanner, taken as 1 s in this case; H is the distance between the scanner and the middle plate of the conveyor trough, which can be 1 m; Li is the distance between the coal material and the scanner, which can be 0.2 to 0.7 m; v is the chain speed of the scraper conveyor, taken as 2 m / s; p is the number of times the coal is scanned by the laser coal scanner, which can be 30; T is the transport time, which can be 60 s.

[0105] Step S205: Based on the real-time traffic volume parameters, query each benchmark control parameter to obtain the target benchmark control parameter corresponding to the real-time traffic volume parameters;

[0106] In the specific implementation process of this step, the target reference control parameters corresponding to the real-time transport volume parameters can be queried by using the pre-determined reference control parameters corresponding to each transport volume parameter of the transfer machine. The target reference control parameters include the reference pressure control parameters, reference displacement control parameters, and reference torque control parameters of the current head extension cylinder of the transfer machine at the current moment, which are corresponding to the real-time transport volume parameters.

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

[0108] In this step, the second gap D2 between the chain and the bottom plate of the lower chain track is obtained by measuring the distance using an infrared ranging sensor.

[0109] Step S207: Determine whether the second gap meets the preset conditions, and obtain the determination result;

[0110] In 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 of the hydraulic cylinder calibration remains unchanged;

[0112] In the specific implementation process 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 machine head telescopic cylinder stops operating, and the pressure P and displacement S calibrated by the cylinder remain 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 extension and retraction of the telescopic cylinder of the transfer machine.

[0114] When the second gap is less than the first preset threshold, the first retraction stroke parameter is obtained by calculation 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 extend the machine head cylinder beyond the first retraction stroke parameter; the third gap between the measuring chain and the lower chain track bottom plate is re-monitored; 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 less than the first preset threshold, the first pressure and the first displacement are controlled to increase until the distance between the measuring chain and the lower chain track bottom plate is greater than the first preset threshold and less than the second preset threshold, the machine head telescopic cylinder is controlled to stop moving, and the chain is in the target tension state. When the second gap is less than the first preset threshold, it indicates that the chain is too loose. Control the extension stroke of the machine head cylinder X×Y% (in this case, the cylinder stroke X=500mm, and Y is 5), increase the cylinder displacement S, increase the cylinder pressure P, and return to S7. Measure the D value until D=U±10%mm (D=5±10%mm), at which point the machine head extension cylinder stops operating, and the chain is in an ideal tension state.

[0115] When the second gap is greater than the second preset threshold, the second contraction stroke parameter is obtained by calculation 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 decrease, so that the head cylinder contracts the second contraction stroke parameter; the fourth gap between the measuring chain and the lower chain track bottom plate 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 reduced first pressure and the first displacement; when the fourth gap is greater than the second preset threshold, the first pressure and the first displacement are controlled to decrease until the distance between the measuring chain and the lower chain track 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. When the second gap is greater than the second preset threshold, if D > U + 10% mm (D > 5 + 10% mm), it indicates that the chain is too tight. Control the machine head cylinder to contract the cylinder stroke X × Y% (in this case, the cylinder stroke X = 500 mm, and Y is 5), reduce the cylinder displacement S, reduce the cylinder pressure P, and return to S7. Measure the D value until D = U ± 10% mm (D = 5 ± 10% mm), at which point the machine head extension cylinder stops operating, and the chain is in an ideal tension state.

[0116] This application obtains the start-stop information of the transfer machine; when the start-stop information indicates a stop state, it controls the telescopic cylinder of the transfer machine to be in a fully retracted state; it determines the baseline control parameters corresponding to each conveying capacity parameter of the transfer machine; when the start-stop information indicates a start state, it performs calculations based on the basic parameters and material parameters of the transfer machine to obtain the real-time conveying capacity parameters of the transfer machine; it queries each baseline control parameter based on the real-time conveying capacity parameters to obtain the target baseline control parameters corresponding to the real-time conveying capacity parameters; it monitors and obtains the second gap between the measuring chain and the lower chain track bottom plate in real time; it determines whether the second gap meets the preset conditions and obtains the judgment result; when the judgment result indicates that the second gap meets the preset conditions, it maintains the target baseline control parameters calibrated by the cylinder unchanged; when the judgment result indicates that the second gap does not meet the preset conditions, it adjusts the target baseline control parameters to automatically control the telescopic cylinder of the transfer machine. If the transfer machine stops, the telescopic cylinder fully retracts, automatically slacks the chain, and eliminates excess load on the chain. When the transfer conveyor is started, the control system determines the chain tension based on the real-time conveyor capacity, real-time torque, and pressure and displacement information of the head telescopic cylinder. It then controls the automatic extension and retraction of the head telescopic cylinder to compensate for chain deformation, ultimately achieving automatic chain tensioning and ensuring the chain remains in an ideal tension state. This dynamic chain tension adjustment method can improve equipment lifespan.

[0117] like Figures 3 to 5 As shown, an embodiment of the second aspect of this application provides a chain tension dynamic adjustment system capable of dynamically adjusting the chain tension based on the gap between the head chain and the lower chain track bottom plate 3. The system includes a telescopic head 1, a gap identification module 2, a laser scanner 4, an information collection module, and an analysis and control module. The telescopic head 1 includes a telescopic cylinder 11. The gap identification module 2 is disposed on the lower chain track bottom plate 3 and is used to acquire the gap parameters between the chain and the lower chain track bottom plate 3. The laser scanner 4 is disposed below the top plate 5 of the trough in the middle section of the transfer machine's landing section and is used to acquire the stacking height of the target material. The information collection module is used to acquire the pressure and displacement of the telescopic cylinder 11 of the transfer machine. The analysis and control module is signal-connected to the telescopic cylinder 11, the gap identification module 2, the laser scanner 4, and the information collection module, and is used to automatically control the telescopic cylinder 11 of the transfer machine.

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

[0119] In specific implementation, the telescopic conveyor head 1 also includes a fixed groove 12 and a telescopic frame 13. The telescopic frame 13 is arranged along the transport direction of the transfer conveyor and overlaps the fixed groove 12. The telescopic frame 13 is used to connect with the sprocket shaft assembly 14. The sprocket shaft assembly 14 includes a conveyor head sprocket and a conveyor head chain. The conveyor head chain circulates around the conveyor head sprocket to realize the transfer and transport of coal. The fixed end (cylinder body) of the telescopic cylinder 11 is fixedly connected to the fixed groove 12, and the driving end of the telescopic cylinder 11 is connected to the telescopic frame 13.

[0120] Specifically, when the drive end of the telescopic cylinder 11 extends, it drives the telescopic frame 13 to move away from the fixed groove 12, at which time the tension force on the machine head chain increases; when the drive end of the telescopic cylinder 11 shortens, it drives the telescopic frame 13 to move closer to the fixed groove 12, at which time the tension force on the machine head chain decreases.

[0121] In practical implementation, the analysis and control module further includes an information acquisition module, a calculation and control module, an information output module, and a data feedback module. The information acquisition module receives start / stop information of the transfer machine, basic parameters and material parameters of the transfer machine, gap parameters between the chain and the lower chain conveyor base plate 3, and real-time conveying capacity parameters of the transfer machine. The calculation and control module analyzes the chain tension based on the information acquisition module and converts it into a control signal to determine whether the head chain is at a suitable tension level and controls the extension and retraction of the telescopic cylinder 11. The information output module transmits the control signal to the telescopic cylinder 11, thereby controlling the telescopic cylinder 11 to perform extension and retraction actions, thus adjusting the gap between the head chain and the lower chain conveyor base plate 3. The data feedback module, after automatically controlling the extension and retraction of the telescopic cylinder 11, feeds back the gap parameters between the chain and the lower chain conveyor base plate 3 to the calculation and control module, thereby re-analyzing and determining whether the head chain is at a suitable tension level and controlling the telescopic cylinder 11 to extend and retract again until the head chain is at a suitable tension level.

[0122] In practice, the gap recognition module 2 can be an infrared ranging sensor.

[0123] This application obtains the start-stop information of the transfer machine; when the start-stop information indicates a stopped state, it controls the telescopic cylinder of the transfer machine to be in a fully retracted state, thus fully relaxing the chain, eliminating excess load on the chain, and extending the chain's service life. When the start-stop information indicates an started state, it calculates and processes the basic parameters and material parameters of the transfer machine to obtain the real-time conveying capacity parameters of the transfer machine; based on the real-time conveying capacity parameters, it automatically controls the telescopic cylinder of the transfer machine to extend and retract. This achieves automatic extension and retraction control of the machine head telescopic cylinder. 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, preventing the chain from being in a tense state for a long time and causing plastic deformation, thereby extending the service life of the equipment.

[0124] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A method for dynamically adjusting chain tension, applied to a transfer machine that uses a telescopic hydraulic cylinder to drive the extension and retraction of the machine head, characterized in that, Specifically, it includes: Obtain the start / stop information of the transfer machine; When the start / stop information indicates a stopped state, the telescopic cylinder controlling the transfer machine is in a fully retracted state. When the start / stop information indicates that the machine is in the start state, calculations are performed based on the basic parameters and material parameters of the transfer machine to obtain the real-time transport capacity parameters of the transfer machine. The telescopic cylinder of the transfer machine is automatically extended and retracted based on the real-time transport volume parameters. Before automatically extending and retracting the telescopic cylinder of the transfer machine based on the real-time transport volume parameters, the method further includes: determining the reference control parameters corresponding to each transport volume parameter of the transfer machine; The determination of the baseline control parameters corresponding to each transport capacity parameter of the transfer machine specifically includes: The first gap between the chain and the bottom plate of the lower chain track is measured during the process of the transfer machine conveying materials with different conveying 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 telescopic cylinder are determined as the reference control parameters. 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 telescopic cylinder are determined as the reference control parameters, so as to obtain the reference control parameters corresponding to each different transport capacity parameter; The automatic extension and retraction control of the telescopic cylinder of the transfer machine based on the real-time transport volume parameters specifically includes: Based on the real-time traffic volume parameters, query each benchmark control parameter to obtain the target benchmark control parameter corresponding to the real-time traffic volume parameters; Real-time monitoring is used to obtain the second gap between the measuring chain and the bottom plate of the lower chain track. Determine whether the second gap meets the preset conditions, and obtain the determination result; When the judgment result indicates that the second gap meets the preset condition, the target reference control parameters calibrated by the telescopic cylinder are kept unchanged; When the judgment result indicates that the second gap does not meet the preset conditions, the target reference control parameters are adjusted to automatically control the extension and retraction of the transfer machine's telescopic cylinder.

2. The method for dynamically adjusting chain tension 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 capacity parameters of the transfer machine specifically includes: The stacking height of the target material is obtained by calculating the first distance between the target material and the predetermined scanning device and the second distance between the predetermined scanning device and the middle plate of the landing section of the transfer machine. The cross-sectional area of ​​the target material is obtained by performing calculations based on the stacking height. The total volume of the target material is calculated 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 between two adjacent scans of the target material, and the cross-sectional area. The total weight of the target material is obtained by calculation based on the predetermined specific gravity of the target material and the total volume. The real-time transport capacity parameters of the transshipment machine at the current moment are obtained by calculating based on the total volume, the total weight, the number of scans at the current moment, and the predetermined transport time.

3. The method for dynamically adjusting chain tension according to claim 1, characterized in that, When the judgment result indicates that the second gap does not meet the preset condition, the target reference control parameters are adjusted to automatically control the extension and retraction of the telescopic cylinder of the transfer machine, specifically including: When the second gap is less than the first preset threshold, the first retraction stroke parameter is obtained by calculation based on the current cylinder stroke parameter and the preset proportional coefficient. The first pressure and the first displacement are controlled to increase the target reference control parameters, so that the telescopic cylinder extends out of the first retraction stroke parameter; The third gap between the chain and the bottom plate of the lower chain track was re-monitored and measured. 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 first pressure and the first displacement after the control increase. When the third gap is less than the first preset threshold, the first pressure and the first displacement are increased until the distance between the measured chain and the bottom plate of the lower chain track is greater than the first preset threshold and less than the second preset threshold. Then, the telescopic cylinder is stopped and the chain is in the target tension state.

4. The method for dynamically adjusting chain tension according to claim 1, characterized in that, The step of adjusting the target reference control parameters when the judgment result indicates that the second gap does not meet the preset conditions, in order to automatically control the extension and retraction of the telescopic cylinder of the transfer machine, further includes: When the second gap is greater than the second preset threshold, the second retraction stroke parameter is obtained by calculation based on the current cylinder stroke parameter and the preset proportional coefficient. The first pressure and the first displacement are controlled to decrease the target reference control parameters, causing the telescopic cylinder to contract the second contraction stroke parameter; The fourth gap between the measuring chain and the bottom plate of the lower chain track was re-monitored and measured. 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 reduced first pressure and the first displacement. When the fourth gap is greater than the second preset threshold, the first pressure and the first displacement are reduced until the distance between the measured chain and the bottom plate of the lower chain track is greater than the first preset threshold and less than the second preset threshold. Then, the telescopic cylinder is controlled to stop moving and the chain is in the target tension state.

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