Scraper conveyor chain tension control method and system, scraper conveyor

Abstract

A method for controlling the chain tension of a scraper conveyor is disclosed. The method collects real-time data on the distances between the head and tail transition trough scrapers and the upper edge, as well as the distance between the lower chain path scraper and the mid-plate. These data are compared with the distances in a calibrated state (when the chain tension is appropriate), using the difference ΔS at different positions to reflect the chain tension at different locations. This method then comprehensively determines whether the overall scraper conveyor chain is in a loose or overtightened state. During chain tension adjustment, the required displacement ΔX of the telescopic mechanism's tail cylinder is calculated and analyzed, and this ΔX serves as the adjustment target for the telescopic mechanism's tail adjustment cylinder, achieving chain tension adjustment. To address local chain looseness or overtightness, the scraper conveyor's head / tail drive motors are controlled to operate at a speed difference of Δn, thereby adjusting the local chain tension. A chain tension control system and a scraper conveyor are also provided.

Description

Technical Field

[0001] The present invention relates to the technical field of scraper conveyors, and in particular to a method and system for controlling the tightness of a chain of a scraper conveyor, and a scraper conveyor. Background Art

[0002] The chain tension of a scraper conveyor is crucial to its proper operation. A chain that's too loose can easily cause problems such as chain pile-up, chain jamming, and chain breakage; a chain that's too tight can damage the chain and increase wear. Therefore, controlling and adjusting the chain to maintain the proper tension has long been a key research topic in scraper conveyor equipment.

[0003] Currently, the main method for measuring the chain tension is to measure it by the pressure parameters of the telescopic machine's tail cylinder. The main adjustment methods are: ① Pressure-displacement automatic tensioning control system, that is, the controller collects the pressure and displacement parameters of the telescopic machine's tail hydraulic cylinder in real time, analyzes and determines the control amount of the hydraulic cylinder's extension and contraction, and then adjusts the position of the telescopic machine's tail to adjust the chain tension. In the pressure-displacement automatic tensioning control system, since the working surface length is generally greater than or equal to 150 meters and the tension range is large, the telescopic machine's tail cylinder only acts on a certain length of the scraper chain when it is in operation, and it is difficult to act on the entire scraper chain. Relying solely on the pressure and displacement parameters of the telescopic machine's tail cylinder is difficult to accurately feedback the chain tension status, and it is easy to cause the situation where "after the chain is tensioned, the scraper conveyor runs a few circles and the chain becomes loose."

[0004] ② Based on the load-following automatic tensioning control method of the scraper conveyor chain, that is, by obtaining the scraper conveyor torque, coal mining machine position, and coal mining machine direction information, and collecting the tail cylinder pressure and cylinder displacement information, and analyzing and calculating the data, the analysis results are output to the hydraulic control system. The hydraulic control system controls the movement of the telescopic machine tail cylinder according to the output results, thereby controlling the chain tension to achieve the desired effect. Based on the load-following automatic tensioning control method of the scraper conveyor chain, it is mainly aimed at working environments with large load changes. The load torque is divided into several gears, and different load ranges correspond to different cylinder extension amounts. This method solves the problem of adjusting the chain tension caused by sudden load changes to a certain extent, but it still does not completely solve the problem that "the telescopic machine tail cylinder only acts on a certain length range of the scraper chain when it is in action, and it is difficult to act on the entire scraper chain." Summary of the Invention

[0005] In order to solve the technical problems existing in the above technology, it is necessary to provide a method for controlling the tightness of the chain of a scraper conveyor.

[0006] A method for controlling the tension state of a scraper conveyor chain comprises the following steps:

[0007] Step 1: Obtain the calibration distance s between the scraper and the upper edge of the transition groove at the head a , the calibration distance value s between the scraper and the upper edge of the transition groove at the tail of the machine b , the calibration distance value s between the scraper and the transition groove middle plate at the head c , the calibration distance value s between the scraper and the transition trough middle plate at the tail of the machine d ;

[0008] Step 2: Obtain the real-time distance value s1 between the scraper and the upper edge of the transition groove at the head, the real-time distance value s2 between the scraper and the upper edge of the transition groove at the tail, the real-time distance value s3 between the scraper and the middle plate of the transition groove at the head, the real-time distance value s4 between the scraper and the middle plate of the transition groove at the tail, as well as the cylinder displacement value and the cylinder pressure value;

[0009] Step 3: Obtain the change in the distance between the scraper and the upper edge of the transition groove at the head part ΔS1 = s1-s a The change in the distance between the scraper and the upper edge of the transition groove at the tail of the machine is ΔS2 = s2-s b ; The change in the distance between the scraper and the transition groove plate at the head part ΔS3=s3-s c ; The change in the distance between the scraper and the transition groove plate at the tail of the machine ΔS4=s4-s d ;

[0010] Step 4: Based on the comparison between the distance value changes ΔS1, ΔS2, ΔS3, and ΔS4 and the distance change threshold δ, determine whether the chain is in a state of appropriate tightness; if so, end; if not, proceed to the next step;

[0011] Step 5: Determine the real-time pressure value P of the cylinder 实时 And the cylinder alarm pressure value P 报警 Does the relationship conform to P 实时 ≥P 报警 If yes, the telescopic tail stops, the fault alarm is activated, and the process ends; if no, proceed to the next step;

[0012] Step 6: Adjust the chain tightness according to the looseness or overtightness of the upper or lower chain track, as well as the looseness or overtightness of the upper / lower chain track at the head / tail of the machine. After the adjustment is completed, return to step 2 and check again until the chain tightness is adjusted to meet the requirements.

[0013] Preferably, in step 4, when judging whether the chain is in a state of appropriate tightness, the following method is adopted:

[0014] When ΔS1 ≥ δ and ΔS2 ≥ δ, the upper chain is judged to be in a relaxed state;

[0015] When ΔS1<δ and ΔS2<δ, it is determined that the chain is in an overtightened state;

[0016] When ΔS3 < δ and ΔS4 < δ, it is determined that the lower chain is in an overtightened state;

[0017] When ΔS3 ≥ δ and ΔS4 ≥ δ, the lower chain is judged to be in a relaxed state;

[0018] When ΔS1 ≥ δ and ΔS2 ≥ δ, ΔS3 < δ and ΔS4 < δ, the chain is judged to be in a loose state;

[0019] When ΔS1<δ and ΔS2<δ, ΔS3<δ and ΔS4<δ, the chain is judged to be in an overtight state;

[0020] When ΔS1≥δ, it is determined that the chain on the head is in a loose state;

[0021] When ΔS1<δ, it is determined that the chain on the head is too tight;

[0022] When ΔS2≥δ, it is determined that the chain on the tail section is in a loose state;

[0023] When ΔS2 < δ, it is determined that the chain on the tail section is in an overtightened state;

[0024] When ΔS3≥δ, it is determined that the chain under the head is in a loose state;

[0025] When ΔS3<δ, it is determined that the chain under the head is in an overtight state;

[0026] When ΔS4≥δ, it is determined that the chain under the tail is in a loose state;

[0027] When ΔS4<δ, it is determined that the chain of the lower chainway at the tail is in an overtight state.

[0028] Preferably, in step 6, the chain tightness is adjusted and controlled in the following manner:

[0029] First, adjust the chain by controlling the telescopic tail of the scraper conveyor;

[0030] If the chain at the head, tail, upper and lower chains are not all adjusted effectively, adjust the chain tightness again by speed compensation.

[0031] After the adjustment is completed, return to step 2 and check again until the chain tightness is adjusted to meet the requirements.

[0032] Preferably, when adjusting the chain by controlling the telescopic tail of the scraper conveyor, the following method is adopted:

[0033] When the chain is slack:

[0034] Determine the extension amount ΔX of the telescopic machine's tail cylinder and control the extension of the telescopic machine's tail cylinder;

[0035] Determine the real-time pressure value P of the cylinder 实时 And the cylinder alarm pressure value P 报警 Does the relationship conform to P 实时 ≥P 报警 If yes, the telescopic tail stops, the fault alarm is activated, and the process ends; if no, proceed to the next step;

[0036] Determine whether the cylinder displacement reaches the target displacement, that is, X 目标 =X 初 +ΔX; if yes, return to the previous step; if no, the telescopic tail cylinder continues to extend;

[0037] When the chain is too tight:

[0038] Determine the retraction amount ΔY of the telescopic machine's tail cylinder and control the retraction of the telescopic machine's tail cylinder;

[0039] Determine the real-time pressure value P of the cylinder 实时 And the cylinder alarm pressure value P 报警 Does the relationship conform to P 实时 ≥P 报警 If yes, the telescopic tail stops, the fault alarm is activated, and the process ends; if no, proceed to the next step;

[0040] Determine whether the cylinder displacement reaches the target displacement, that is, Y 目标 =Y 初 -ΔY; if yes, return to the previous step; if not, extend the telescopic tail cylinder and continue to retract.

[0041] Preferably, when the chain tightness is readjusted by speed compensation, the following method is adopted:

[0042] When the upper chain is loose and the lower chain is too tight:

[0043] Control the scraper conveyor head motor speed to increase Δn1, that is, the head motor speed output value is n1=n 初 +Δn1; the tail motor is n 初 The speed of operation; where n 初 It is the speed of the motor of the handpiece during normal operation;

[0044] When the upper chain is too tight and the lower chain is too loose:

[0045] Control the scraper conveyor tail motor speed to increase Δn2, that is, the tail motor speed output value is n2 = n 初+Δn2; the motor of the machine head is n 初 The speed of operation; where n 初 It is the speed of the tail motor during normal operation.

[0046] Preferably, the calibration distance value s a 、s b 、s c 、s d This is the value measured when the chain is in a properly tight state.

[0047] A chain tightness control system for a scraper conveyor is also provided.

[0048] A chain tension state control system for a scraper conveyor, comprising a sensor module, a control device, and a tail hydraulic telescopic device;

[0049] The sensor module is used to obtain the calibration distance value s between the scraper and the upper edge of the transition groove at the head part a , the calibration distance value s between the scraper and the upper edge of the transition groove at the tail of the machine b , the calibration distance value s between the scraper and the transition groove middle plate at the head c , the calibration distance value s between the scraper and the transition trough middle plate at the tail of the machine d The real-time distance value s1 between the scraper and the upper edge of the transition groove at the head, the real-time distance value s2 between the scraper and the upper edge of the transition groove at the tail, the real-time distance value s3 between the scraper and the middle plate of the transition groove at the head, the real-time distance value s4 between the scraper and the middle plate of the transition groove at the tail, as well as the displacement value and pressure value of the oil cylinder;

[0050] The control device is used to receive data measured in real time by the sensor module and process the acquired data to realize control of the tail hydraulic telescopic device.

[0051] Preferably, the sensor module includes a distance sensor and a pressure sensor;

[0052] The distance sensor includes a vertically mounted distance measuring sensor arranged at the upper edge of the transition trough at the tail of the scraper conveyor, used to monitor the real-time distance value s1 between the scraper and the upper edge of the transition trough at the tail; a vertically mounted distance measuring sensor arranged at the upper edge of the transition trough at the head of the scraper conveyor, used to monitor the real-time distance value s2 between the scraper and the upper edge of the transition trough at the head; a vertically mounted distance measuring sensor arranged at the middle plate of the transition trough at the tail of the scraper conveyor, used to monitor the real-time distance value s3 between the scraper and the middle plate of the transition trough at the tail; a vertically mounted distance measuring sensor arranged at the middle plate of the transition trough at the head of the scraper conveyor, used to monitor the real-time distance value s4 between the scraper and the middle plate of the transition trough at the head;

[0053] The pressure sensor is used to obtain the oil cylinder pressure value of the tail hydraulic telescopic equipment.

[0054] A scraper conveyor is also provided.

[0055] A scraper conveyor comprises the scraper conveyor chain tightness state control system described above.

[0056] Compared with the prior art, the present invention provides a method and system for controlling the tightness of a scraper conveyor chain, which respectively installs distance measuring sensors at the upper edge and middle plate of the scraper conveyor head and tail transition troughs, and collects the distance between the head and tail transition trough scrapers and the upper edge, and the distance between the lower chain scraper and the middle plate in real time, and compares them with the distances in the calibration state (the state of appropriate chain tightness). The difference ΔS at different positions is used to reflect the tightness of the chain at different positions, and then a comprehensive judgment is made as to whether the scraper conveyor chain as a whole is in a loose or overtight state. In the process of adjusting the tightness of the scraper conveyor chain, the displacement ΔX that needs to be adjusted by the telescopic machine tail cylinder is obtained through calculation and analysis, and ΔX is used as the adjustment target of the telescopic machine tail adjustment cylinder to achieve the purpose of chain tightness adjustment. In response to the situation of local chain looseness or overtightness, the scraper conveyor head / tail drive motor is controlled by frequency conversion to run at a speed difference of the difference Δn, so that the local state of the chain is smoothed and fed back to the entire scraper chain, so that the local chain tightness of the scraper conveyor is adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0058] Figure 1 It is a control flow chart of the present invention.

[0059] Figure 2 This is a schematic diagram of the position structure of the distance measuring sensor installed in the present invention.

[0060] Figure 3 This is a schematic diagram of the present invention when adjusting the chain using a speed compensation method. DETAILED DESCRIPTION

[0061] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0062] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner", "lower" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0063] Please see Figure 1 In one embodiment, the present invention provides a method for controlling the tension state of a scraper conveyor chain, comprising the following steps:

[0064] Step 1: Obtain the calibration distance s between the scraper and the upper edge of the transition groove at the head a , the calibration distance value s between the scraper and the upper edge of the transition groove at the tail of the machine b , the calibration distance value s between the scraper and the transition groove middle plate at the head c , the calibration distance value s between the scraper and the transition trough middle plate at the tail of the machine d ; Among them, the calibration distance value s a 、s b 、s c 、s d This is the value measured when the chain is in a properly tight state.

[0065] Step 2: Obtain the real-time distance value s1 between the scraper and the upper edge of the transition groove at the head, the real-time distance value s2 between the scraper and the upper edge of the transition groove at the tail, the real-time distance value s3 between the scraper and the middle plate of the transition groove at the head, the real-time distance value s4 between the scraper and the middle plate of the transition groove at the tail, as well as the cylinder displacement value and the cylinder pressure value.

[0066] Step 3: Obtain the change in the distance between the scraper and the upper edge of the transition groove at the head part ΔS1 = s1-s a The change in the distance between the scraper and the upper edge of the transition groove at the tail of the machine is ΔS2 = s2-s b ; The change in the distance between the scraper and the transition groove plate at the head part ΔS3=s3-s c ; The change in the distance between the scraper and the transition groove plate at the tail of the machine ΔS4=s4-s d .

[0067] Step 4: Based on the comparison between the distance value changes ΔS1, ΔS2, ΔS3, and ΔS4 and the distance change threshold δ, determine whether the chain is in a state of appropriate tightness; if so, end; if not, proceed to the next step.

[0068] Step 5: Determine the real-time pressure value P of the cylinder 实时 And the cylinder alarm pressure value P 报警 Does the relationship conform to P 实时 ≥P 报警If yes, the telescopic tail stops moving, the fault alarm is activated, and the process ends; if no, proceed to the next step.

[0069] Step 6: Adjust the chain tightness according to the looseness or overtightness of the upper or lower chain track, as well as the looseness or overtightness of the upper / lower chain track at the head / tail of the machine. After the adjustment is completed, return to step 2 and check again until the chain tightness is adjusted to meet the requirements.

[0070] In one embodiment, it is necessary to elaborate that in step 4, when determining whether the chain is in a state of appropriate tightness, the following method is used:

[0071] When ΔS1 ≥ δ and ΔS2 ≥ δ, the upper chain is judged to be in a relaxed state;

[0072] When ΔS1<δ and ΔS2<δ, it is determined that the chain is in an overtightened state;

[0073] When ΔS3 < δ and ΔS4 < δ, it is determined that the lower chain is in an overtightened state;

[0074] When ΔS3 ≥ δ and ΔS4 ≥ δ, the lower chain is judged to be in a relaxed state;

[0075] When ΔS1 ≥ δ and ΔS2 ≥ δ, ΔS3 < δ and ΔS4 < δ, the chain is judged to be in a loose state;

[0076] When ΔS1<δ and ΔS2<δ, ΔS3<δ and ΔS4<δ, the chain is judged to be in an overtight state;

[0077] When ΔS1≥δ, it is determined that the chain on the head is in a loose state;

[0078] When ΔS1<δ, it is determined that the chain on the head is too tight;

[0079] When ΔS2≥δ, it is determined that the chain on the tail section is in a loose state;

[0080] When ΔS2 < δ, it is determined that the chain on the tail section is in an overtightened state;

[0081] When ΔS3≥δ, it is determined that the chain under the head is in a loose state;

[0082] When ΔS3<δ, it is determined that the chain under the head is in an overtight state;

[0083] When ΔS4≥δ, it is determined that the chain under the tail is in a loose state;

[0084] When ΔS4<δ, it is determined that the chain of the lower chainway at the tail is in an overtight state.

[0085] In one embodiment, it is necessary to elaborate that, in step 6, the chain tension adjustment control is carried out in the following manner:

[0086] 1. First adjust the chain by controlling the telescopic tail of the scraper conveyor;

[0087] 2. If the chain at the head, tail, upper and lower chains are not all adjusted effectively, adjust the chain tightness again by speed compensation;

[0088] 3. After the adjustment is completed, return to step 2 and check again until the chain tightness is adjusted to meet the requirements.

[0089] In one embodiment, it is necessary to elaborate that when adjusting the chain by controlling the telescopic tail of the scraper conveyor, the following method is adopted:

[0090] When the chain is slack:

[0091] 1. Determine the extension amount ΔX of the telescopic machine's tail cylinder and control the extension of the telescopic machine's tail cylinder;

[0092] 2. Determine the real-time pressure value P of the cylinder 实时 And the cylinder alarm pressure value P 报警 Does the relationship conform to P 实时 ≥P 报警 If yes, the telescopic tail stops, the fault alarm is activated, and the process ends; if no, proceed to the next step;

[0093] 3. Determine whether the cylinder displacement reaches the target displacement, that is, X 目标 =X 初 +ΔX; if yes, return to the previous step; if no, the telescopic tail cylinder continues to extend;

[0094] When the chain is too tight:

[0095] 1. Determine the retraction amount ΔY of the telescopic machine's tail cylinder and control the retraction of the telescopic machine's tail cylinder;

[0096] 2. Determine the real-time pressure value P of the cylinder 实时 And the cylinder alarm pressure value P 报警 Does the relationship conform to P 实时 ≥P 报警 If yes, the telescopic tail stops, the fault alarm is activated, and the process ends; if no, proceed to the next step;

[0097] 3. Determine whether the cylinder displacement reaches the target displacement, that is, Y 目标 =Y 初-ΔY; if yes, return to the previous step; if not, extend the telescopic tail cylinder and continue to retract.

[0098] Please see Figure 3 In one embodiment, it is necessary to elaborate that when the chain tension is readjusted by speed compensation, the following method is adopted:

[0099] When the upper chain is loose and the lower chain is too tight:

[0100] Control the scraper conveyor head motor speed to increase Δn1, that is, the head motor speed output value is n1=n 初 +Δn1; the tail motor is n 初 The speed of operation; where n 初 It is the speed of the head motor during normal operation; the head motor is Δn1 (r / s) faster than the tail motor, which can quickly adjust the slack of the upper chain. The stroke increment of the upper chain is added to the lower chain to improve the overtightness of the lower chain. When the chain reaches the appropriate tightness, the original drive state is restored to achieve the purpose of adjusting the chain tightness.

[0101] When the upper chain is too tight and the lower chain is too loose:

[0102] Control the scraper conveyor tail motor speed to increase Δn2, that is, the tail motor speed output value is n2 = n 初 +Δn2; the motor of the machine head is n 初 The speed of operation; where n 初 It is the speed of the tail motor during normal operation; the tail motor runs faster than the head drive motor Δn2 (r / s), quickly tightening the loose chain on the lower chain path, and adding the stroke increment of the lower chain path to the upper chain path, so that the overtight state of the upper chain path can be adjusted. When the chain reaches the appropriate tightness, the original drive state is restored to achieve the purpose of adjusting the chain tightness.

[0103] Please see Figure 2 In one embodiment, the present invention provides a chain tension state control system for a scraper conveyor, comprising a sensor module, a control device, and a tail hydraulic telescopic device;

[0104] The sensor module is used to obtain the calibration distance value s between the scraper and the upper edge of the transition groove at the head. a , the calibration distance value s between the scraper and the upper edge of the transition groove at the tail of the machine b , the calibration distance value s between the scraper and the transition groove middle plate at the head c , the calibration distance value s between the scraper and the transition trough middle plate at the tail of the machine dThe real-time distance value s1 between the scraper and the upper edge of the transition groove at the head, the real-time distance value s2 between the scraper and the upper edge of the transition groove at the tail, the real-time distance value s3 between the scraper and the middle plate of the transition groove at the head, the real-time distance value s4 between the scraper and the middle plate of the transition groove at the tail, as well as the displacement value and pressure value of the oil cylinder;

[0105] The control device receives real-time data from the sensor module and processes it to control the tail hydraulic telescopic device. The control device can be a PLC control cabinet. The tail hydraulic telescopic device can utilize a hydraulic telescopic cylinder system.

[0106] Specifically, the sensor module includes a distance sensor and a pressure sensor;

[0107] Among them, the distance sensor includes a vertically mounted distance measuring sensor arranged at the upper edge of the transition trough at the tail of the scraper conveyor, which is used to monitor the real-time distance value s1 between the scraper and the upper edge of the transition trough at the tail; a vertically mounted distance measuring sensor arranged at the upper edge of the transition trough at the head of the scraper conveyor, which is used to monitor the real-time distance value s2 between the scraper and the upper edge of the transition trough at the head; a vertically mounted distance measuring sensor arranged at the middle plate of the transition trough at the tail of the scraper conveyor, which is used to monitor the real-time distance value s3 between the scraper and the middle plate of the transition trough at the tail; a vertically mounted distance measuring sensor arranged at the middle plate of the transition trough at the head of the scraper conveyor, which is used to monitor the real-time distance value s4 between the scraper and the middle plate of the transition trough at the head;

[0108] Among them, the pressure sensor is used to obtain the cylinder pressure value of the tail hydraulic telescopic equipment.

[0109] In one embodiment, the present invention provides a scraper conveyor, including a chain tension state control system for the scraper conveyor.

[0110] The above disclosure is only a preferred embodiment of the present invention, and it is certainly not intended to limit the scope of the present invention. A person skilled in the art can understand that all or part of the processes of the above embodiment and equivalent changes made in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A method for controlling the tension state of a scraper conveyor chain, characterized in that: The following steps are included: Step 1: Obtain the calibration distance s between the scraper and the upper edge of the transition groove at the head a , the calibration distance value s between the scraper and the upper edge of the transition groove at the tail of the machine b , the calibration distance value s between the scraper and the transition groove middle plate at the head c , the calibration distance value s between the scraper and the transition trough middle plate at the tail of the machine d ; Step 2: Obtain the real-time distance value s1 between the scraper and the upper edge of the transition groove at the head, the real-time distance value s2 between the scraper and the upper edge of the transition groove at the tail, the real-time distance value s3 between the scraper and the middle plate of the transition groove at the head, the real-time distance value s4 between the scraper and the middle plate of the transition groove at the tail, as well as the cylinder displacement value and the cylinder pressure value; Step 3: Obtain the change in the distance between the scraper and the upper edge of the transition groove at the head part ΔS1 = s1-s a The change in the distance between the scraper and the upper edge of the transition groove at the tail of the machine is ΔS2 = s2-s b ; The change in the distance between the scraper and the transition groove plate at the head part ΔS3=s3-s c ; The change in the distance between the scraper and the transition groove plate at the tail of the machine ΔS4=s4-s d ; Step 4: Based on the comparison between the distance value changes ΔS1, ΔS2, ΔS3, and ΔS4 and the distance change threshold δ, determine whether the chain is in a state of appropriate tightness; if so, end; if not, proceed to the next step; Step 5: Determine the real-time pressure value P of the cylinder 实时 And the cylinder alarm pressure value P 报警 Does the relationship conform to P 实时 ≥P 报警 If yes, the telescopic tail stops, the fault alarm is activated, and the process ends; if no, proceed to the next step; Step 6: Adjust the chain tightness according to the looseness or overtightness of the upper or lower chain track, as well as the looseness or overtightness of the upper / lower chain track at the head / tail of the machine. After the adjustment is completed, return to step 2 and check again until the chain tightness is adjusted to meet the requirements.

2. The method for controlling the tension state of a scraper conveyor chain according to claim 1, characterized in that: In step 4, to determine whether the chain is in a suitable tightness, use the following method: When ΔS1 ≥ δ and ΔS2 ≥ δ, the upper chain is judged to be in a relaxed state; When ΔS1<δ and ΔS2<δ, it is determined that the chain is in an overtightened state; When ΔS3 < δ and ΔS4 < δ, it is determined that the lower chain is in an overtightened state; When ΔS3 ≥ δ and ΔS4 ≥ δ, the lower chain is judged to be in a relaxed state; When ΔS1 ≥ δ and ΔS2 ≥ δ, ΔS3 < δ and ΔS4 < δ, the chain is judged to be in a loose state; When ΔS1<δ and ΔS2<δ, ΔS3<δ and ΔS4<δ, the chain is judged to be in an overtight state; When ΔS1≥δ, it is determined that the chain on the head is in a loose state; When ΔS1<δ, it is determined that the chain on the head is too tight; When ΔS2≥δ, it is determined that the chain on the tail section is in a loose state; When ΔS2 < δ, it is determined that the chain on the tail section is in an overtightened state; When ΔS3≥δ, it is determined that the chain under the head is in a loose state; When ΔS3<δ, it is determined that the chain under the head is in an overtight state; When ΔS4≥δ, it is determined that the chain under the tail is in a loose state; When ΔS4<δ, it is determined that the chain of the lower chainway at the tail is in an overtight state.

3. The method for controlling the tension state of a scraper conveyor chain according to claim 1 or 2, characterized in that: In step 6, the chain tension is adjusted and controlled as follows: First, adjust the chain by controlling the telescopic tail of the scraper conveyor; If the chain at the head, tail, upper and lower chains are not all adjusted effectively, adjust the chain tightness again by speed compensation. After the adjustment is completed, return to step 2 and check again until the chain tightness is adjusted to meet the requirements.

4. The method for controlling the tension state of a scraper conveyor chain according to claim 3, characterized in that: When adjusting the chain by controlling the telescopic tail of the scraper conveyor, the following method is used: When the chain is slack: Determine the extension amount ΔX of the telescopic machine's tail cylinder and control the extension of the telescopic machine's tail cylinder; Determine the real-time pressure value P of the cylinder 实时 And the cylinder alarm pressure value P 报警 Does the relationship conform to P 实时 ≥P 报警 If yes, the telescopic tail stops, the fault alarm is activated, and the process ends; if no, proceed to the next step; Determine whether the cylinder displacement reaches the target displacement, that is, X 目标 =X 初 +ΔX; if yes, return to the previous step; if no, the telescopic tail cylinder continues to extend; When the chain is too tight: Determine the retraction amount ΔY of the telescopic machine's tail cylinder and control the retraction of the telescopic machine's tail cylinder; Determine the real-time pressure value P of the cylinder 实时 And the cylinder alarm pressure value P 报警 Does the relationship conform to P 实时 ≥P 报警 If yes, the telescopic tail stops, the fault alarm is activated, and the process ends; if no, proceed to the next step; Determine whether the cylinder displacement reaches the target displacement, that is, Y 目标 =Y 初 -ΔY; if yes, return to the previous step; if not, extend the telescopic tail cylinder and continue to retract.

5. The method for controlling the tension state of a scraper conveyor chain according to claim 4, characterized in that: When re-adjusting the chain tightness by speed compensation, the following method is used when the upper chain is in a loose state and the lower chain is in an overtight state: Control the scraper conveyor head motor speed to increase Δn1, that is, the head motor speed output value is n1=n 初 +Δn1; the tail motor is n 初 The speed of operation; where n 初 It is the speed of the motor of the handpiece during normal operation; When the upper chain is too tight and the lower chain is too loose: Control the scraper conveyor tail motor speed to increase Δn2, that is, the tail motor speed output value is n2 = n 初 +Δn2; the motor of the machine head is n 初 The speed of operation; where n 初 It is the speed of the tail motor during normal operation.

6. The method for controlling the tension state of a scraper conveyor chain according to claim 1, characterized in that: Calibration distance value s a 、s b 、s c 、s d This is the value measured when the chain is in a properly tight state.

7. A chain tension control system for a scraper conveyor, characterized by: Including sensor modules, control equipment, and tail hydraulic telescopic equipment; The sensor module is used to obtain the calibration distance value s between the scraper and the upper edge of the transition groove at the head part a , the calibration distance value s between the scraper and the upper edge of the transition groove at the tail of the machine b , the calibration distance value s between the scraper and the transition groove middle plate at the head c , the calibration distance value s between the scraper and the transition trough middle plate at the tail of the machine d The real-time distance value s1 between the scraper and the upper edge of the transition groove at the head, the real-time distance value s2 between the scraper and the upper edge of the transition groove at the tail, the real-time distance value s3 between the scraper and the middle plate of the transition groove at the head, the real-time distance value s4 between the scraper and the middle plate of the transition groove at the tail, as well as the displacement value and pressure value of the oil cylinder; The control device is used to receive data measured in real time by the sensor module and process the acquired data to realize control of the tail hydraulic telescopic device.

8. The chain tension control system for a scraper conveyor according to claim 7, characterized in that: The sensor module includes a distance sensor and a pressure sensor; The distance sensor includes a vertically mounted distance measuring sensor arranged at the upper edge of the transition trough at the tail of the scraper conveyor, used to monitor the real-time distance value s1 between the scraper and the upper edge of the transition trough at the tail; a vertically mounted distance measuring sensor arranged at the upper edge of the transition trough at the head of the scraper conveyor, used to monitor the real-time distance value s2 between the scraper and the upper edge of the transition trough at the head; a vertically mounted distance measuring sensor arranged at the middle plate of the transition trough at the tail of the scraper conveyor, used to monitor the real-time distance value s3 between the scraper and the middle plate of the transition trough at the tail; a vertically mounted distance measuring sensor arranged at the middle plate of the transition trough at the head of the scraper conveyor, used to monitor the real-time distance value s4 between the scraper and the middle plate of the transition trough at the head; The pressure sensor is used to obtain the oil cylinder pressure value of the tail hydraulic telescopic equipment.

9. A scraper conveyor, characterized in that: It includes the scraper conveyor chain tightness control system as described in claim 7 or 8.

Images