A shearer haulage speed control system and method for fully-mechanized mining face

Abstract

A shearer haulage speed control system and method for a fully mechanized coal mining face, including a centralized controller, a coal quantity detector, and a shearer. The speed control system is divided into two parts. One part is the transfer system, including a transfer conveyor and a variable-frequency motor. The other part is the shearer haulage system, including a shearer conveyor, a head variable-frequency motor, and a tail variable-frequency motor. The centralized controller is connected to the transfer system, the shearer haulage system, the coal quantity detector, and the shearer respectively through communication cables. The centralized controller compares the running speeds of the transfer conveyor and the shearer conveyor to adjust the running speed of the transfer conveyor. The present invention realizes separate and hierarchical speed regulation of the shearer conveyor and the transfer conveyor, effectively avoids the phenomenon of overload shutdown caused by the lag of the transfer conveyor in accelerating speed. At the same time, considering the load sizes of the shearer conveyor and the transfer conveyor itself, the speed regulation scheme is more accurate.

Description

Technical Field

[0001] The present invention relates to the field of coal mine transportation equipment, and particularly to a shearer face scraper conveyor speed control system and method. Background Art

[0002] With the continuous development of intelligent mining technology, variable frequency speed control technology has been gradually applied to various systems in the shearer face. At present, the application of variable frequency speed control technology to scraper conveyors is not yet mature, and only the scraper conveyor can be speed-controlled independently. The main speed control schemes are as follows: estimating the running speeds of the scraper conveyor and the loader by the distance of the shearer from the head of the scraper conveyor; calculating the running speeds of the conveyor and the loader by the coal quantity scanned by the coal quantity detector. During the synchronous speed control process, since the coal quantity scanner is located at the loader, when the coal quantity on the scraper conveyor has not yet been transported to the loader, the coal quantity will increase instantaneously due to the pushing action of the scraper conveyor. According to the existing speed control schemes, only the position of the shearer and the coal quantity scanner are used to calculate the speed of the scraper. The speed control scheme does not consider the load sizes of the scraper conveyor and the loader itself, and there is no independent speed control scheme for the loader. Both the scraper conveyor and the loader are set to run at low speed. When the coal quantity reaches the loader instantaneously, the loader does not have time to speed up, and due to the excessive coal quantity, the loader stops due to overloading and cannot start, resulting in production accidents. Summary of the Invention

[0003] In order to overcome the problems of the prior art, a shearer face scraper conveyor speed control system includes a centralized controller, a loader speed control system, and a scraper conveyor speed control system. The loader speed control system includes a loader, a variable frequency motor, and a coal quantity detector. The scraper conveyor speed control system includes a scraper conveyor, a head variable frequency motor, a tail variable frequency motor, and a shearer. The scraper conveyor is connected to the head variable frequency motor and the tail variable frequency motor. The centralized controller is connected to the loader speed control system and the scraper conveyor speed control system through communication cables respectively.

[0004] Further, the coal quantity detector is arranged at the entrance of the loader.

[0005] Further, a method for a shearer face scraper conveyor speed control system includes the following steps:

[0006] 1) Start the centralized controller and monitor the system communication;

[0007] 2) Sequentially start the loader system and the scraper conveyor system;

[0008] 3) The coal quantity detector detects the coal quantity at the entrance of the loader and feeds the detected data back to the centralized controller;

[0009] 4) The centralized controller calculates the running speed of the scraper conveyor based on information such as the current of the head frequency conversion motor, the current of the tail frequency conversion motor, the current of the shearer cutting motor, and the position of the shearer, and synchronously adjusts the speed of the head frequency conversion motor and the tail frequency conversion motor of the scraper conveyor;

[0010] 5) The centralized controller calculates the running speed of the transfer conveyor based on the coal quantity scanner and the current of the frequency conversion motor of the transfer conveyor, and adjusts the speed of the frequency conversion motor of the transfer conveyor;

[0011] 6) The centralized controller compares the running speeds of the transfer conveyor and the scraper conveyor. Taking the higher running speed as the standard, the centralized controller issues an instruction to adjust the running speed to the transfer conveyor.

[0012] Further, in the method of the shearer face scraper conveyor speed control system, it is characterized in that in step 6, the centralized controller compares the running speeds of the transfer conveyor and the scraper conveyor. If the running speed of the transfer conveyor is lower than that of the scraper conveyor, the transfer conveyor is adjusted to the running speed of the scraper conveyor. If the running speed of the transfer conveyor is higher than that of the scraper conveyor, it runs at the running speed of the transfer conveyor.

[0013] Further, the specific speed adjustment criteria for the frequency conversion motors of the scraper conveyor and the transfer conveyor in steps 4) and 5) are as follows: When the coal quantity index is above 80%, it runs at the rated speed; when the coal quantity index is 60% - 80%, it runs at 80% of the rated speed; when the coal quantity index is 40% - 60%, it runs at 60% of the rated speed; when the coal quantity index is 30% - 40%, it runs at 40% of the rated speed; when the coal quantity index is below 30%, it runs at 30% of the rated speed.

[0014] Further, the calculation method of the coal quantity index of the scraper conveyor is as follows:

[0015] (1)

[0016] (2)

[0017] (3)

[0018] In the formula, A is the coal quantity index of the scraper conveyor, represents the coal quantity index detected in real time, A e represents the rated coal quantity index;

[0019] A 1 - A 5 respectively represent the shearer speed, the shearer position rack number, the shearer cutting motor current, the head frequency conversion motor current, and the tail frequency conversion motor current;

[0020] A 1e to A 5e respectively represent the maximum traction speed of the shearer, the maximum position frame number of the shearer, the rated current of the shearer, the rated current of the head frequency conversion motor, and the rated current of the tail frequency conversion motor;

[0021] K 1 to K 5 are weight values which are respectively: 0.35, 0.24, 0.13, 0.14, 0.14. This value is not a fixed value and can be adjusted according to the actual operation situation of the fully-mechanized mining face equipment.

[0022] Furthermore, the calculation method of the coal quantity index of the belt conveyor is as follows:

[0023] (4)

[0024] (5)

[0025] (6)

[0026] In the formula, is the coal quantity index of the scraper conveyor, represents the coal quantity index detected in real time, B e represents the rated coal quantity index;

[0027] B 1, B 2 respectively represent the current of the belt conveyor frequency conversion motor and the coal quantity scanned by the coal quantity scanner;

[0028] B 1e , B 2e respectively represent the rated current of the belt conveyor frequency conversion motor and the set maximum coal quantity of the coal quantity scanner;

[0029] K 6, K 7 are weight values which are respectively: 0.45, 0.55. This value is not a fixed value and can be adjusted according to the actual operation situation of the fully-mechanized mining face equipment.

[0030] The beneficial effects of the present invention are as follows: A shearer conveyor speed control system and method for a fully mechanized coal mining face. The speed control system is divided into two paths. A coal quantity scanner is arranged at the entrance of the transfer conveyor. The centralized controller calculates the running speed of the transfer conveyor according to the frequency conversion motor of the transfer conveyor and the coal quantity detector. According to information such as the current of the head frequency conversion motor, the current of the tail frequency conversion motor, the cutting motor current of the shearer, and the position of the shearer, the running speed of the shearer conveyor is calculated. When calculating the running speeds of the transfer conveyor and the shearer conveyor, the factor of the load size of the shearer conveyor and the transfer conveyor itself is added, which can more accurately calculate the running speeds of the shearer conveyor and the transfer conveyor, realizing independent and hierarchical speed regulation of the shearer conveyor and the transfer conveyor, and effectively avoiding the phenomenon of overload shutdown caused by the lag of the transfer conveyor in accelerating speed.

[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the working principle of the system of the present invention;

[0033] Figure 2 It is a speed regulation flow chart of the method of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0034] Embodiment 1: As Figure 1 , Figure 2 shown, a shearer conveyor speed control system for a fully mechanized coal mining face includes a centralized controller 1. The speed control system is divided into two parts. One part is the shearer conveyor system, including a shearer conveyor 3, a head frequency conversion motor 5, a tail frequency conversion motor 6, and a shearer 8. The shearer conveyor 3 is connected to the head frequency conversion motor 5 and the tail frequency conversion motor 6. The other part is the transfer system, including a coal quantity detector 2, a transfer conveyor 4, and a frequency conversion motor 7. The centralized controller 1 is connected to the transfer system and the shearer conveyor system respectively through communication cables.

[0035] Embodiment 2: In order to better detect the change of the instantaneous coal load of the transfer conveyor 4, on the basis of the above embodiment, the coal quantity detector 2 is arranged at the entrance of the transfer conveyor 4.

[0036] Embodiment 3: A method for controlling the speed of a shearer conveyor in a fully mechanized coal mining face is realized on the basis of the shearer conveyor speed control system in the above embodiment.

[0037] As Figure 2 shown, the speed regulation steps of this embodiment are as follows:

[0038] 1) First, start the centralized controller 1 and monitor the system communication;

[0039] 2) Then start the transfer system and the shearer conveyor system in sequence;

[0040] 3) Set the coal quantity detector 2 at the entrance of the transfer machine 4 to detect the coal quantity at the entrance of the transfer machine 3, and the detected data is fed back to the centralized controller 1.

[0041] 4) The centralized controller 1 calculates the running speed V1 of the scraper conveyor 3 based on information such as the current of the head variable-frequency motor 5, the current of the tail variable-frequency motor 6, the cutting motor current of the shearer 8, and the position of the shearer 8, and synchronously outputs commands to the head variable-frequency motor 5 and the tail variable-frequency motor 6 of the scraper conveyor 3 for synchronous step-less speed regulation through frequency adjustment.

[0042] 5) The centralized controller 1 calculates the running speed V2 of the transfer machine 4 based on the coal quantity scanner 2 and the current of the variable-frequency motor 7 of the transfer machine 4;

[0043] 6) The centralized controller 1 compares the running speeds of the scraper conveyor 3 and the transfer machine 4, and takes the higher running speed as the standard. The centralized controller 1 issues a speed regulation command to the transfer machine 4.

[0044] Further, when V1 > V2, the centralized controller 1 outputs the running speed V1 command of the scraper conveyor to the variable-frequency motor 7 of the transfer machine 4. The variable-frequency motor 7 adjusts the speed through frequency adjustment according to the V1 speed regulation command issued by the centralized controller 1. When V2 > V1, the centralized controller 1 transmits the running speed V2 command of the transfer machine 4 to the variable-frequency motor 7 of the transfer machine 4, and runs at the running speed of the transfer machine.

[0045] Further, in steps 4) and 5), the specific speed regulation grading standards for the scraper conveyor 3 and the transfer machine 4 are as follows: when the coal quantity index is above 80%, it runs at the rated speed; when the coal quantity index is 60% - 80%, it runs at 80% of the rated speed; when the coal quantity index is 40% - 60%, it runs at 60% of the rated speed; when the coal quantity index is 30% - 40%, it runs at 40% of the rated speed; when the coal quantity index is below 30%, it runs at 30% of the rated speed.

[0046] Further, the calculation method for the coal quantity index of the scraper conveyor 3 is as follows:

[0047] (1)

[0048] (2)

[0049] (3)

[0050] Wherein, A is the coal quantity index of the scraper conveyor, represents the real-time detected coal quantity index, A eRepresents the rated coal quantity index;

[0051] A 1 to A 5 respectively represent the shearer speed, the shearer position frame number, the shearer cutting motor current, the head frequency conversion motor current, and the tail frequency conversion motor current;

[0052] A 1e to A 5e respectively represent the maximum traction speed of the shearer, the maximum position frame number of the shearer, the rated current of the shearer, the rated current of the head frequency conversion motor, and the rated current of the tail frequency conversion motor;

[0053] K 1 to K 5 are the weight values respectively: 0.35, 0.24, 0.13, 0.14, 0.14. This value is not a fixed value and can be adjusted according to the actual operation situation of the fully-mechanized mining face equipment.

[0054] Furthermore, the calculation method of the coal quantity index of the conveyor is:

[0055] (4)

[0056] (5)

[0057] (6)

[0058] In the formula, is the coal quantity index of the scraper conveyor, represents the coal quantity index detected in real time, B e represents the rated coal quantity index;

[0059] B 1, B 2 respectively represent the frequency conversion motor current of the conveyor and the coal quantity scanned by the coal quantity scanner;

[0060] B 1e , B 2e respectively represent the rated current of the frequency conversion motor of the conveyor and the maximum coal quantity set by the coal quantity scanner;

[0061] K 6, K 7 are the weight values respectively: 0.45, 0.55. This value is not a fixed value and can be adjusted according to the actual operation situation of the fully-mechanized mining face equipment.

[0062] Example 4: This example is a specific example obtained by substituting specific data into the formula of Example 3 on the basis of the above Examples 1-3. The maximum speed of the shearer is 12 m / min, the maximum rack number of the shearer position is No. 153, the rated current of the shearer cutting motor is 136 A, the rated power of the frequency conversion motors at the head and tail of the scraper conveyor is 855 KW, and the rated current is 172 A;

[0063] The power of the conveyor is 525 KW, the rated current is 107 A, the maximum scanned coal volume of the coal volume scanner is 100. Substituting the above parameters into formulas (3) and (6) gives:

[0064]

[0065] Assume the shearer speed is 11 m / min; the rack number of the shearer position is No. 140, the current of the shearer cutting motor is 130 A, and the currents of the motors at the head and tail of the scraper conveyor are 160 A. Substituting the above parameters into formulas (2) and (1) gives:

[0066]

[0067]

[0068] At this time, the scraper conveyor runs at the rated speed of 1450 r / min.

[0069] Assume the current of the conveyor is 100 A, and the scanned coal volume of the coal volume scanner is 90. Substituting the above parameters into formulas (5) and (4) gives:

[0070]

[0071]

[0072] At this time, the conveyor runs at the rated speed of 1450 r / min.

[0073] Example 5: This example is a specific example obtained by substituting specific data into the formula of Example 3 on the basis of the above Examples 1-3. Let the shearer speed be 6 m / min; the rack number of the shearer position is No. 75, the current of the shearer cutting motor is 68 A, and the currents of the motors at the head and tail of the scraper conveyor are 72 A.

[0074] Substituting the above parameters into formulas (2) and (1) gives:

[0075]

[0076]

[0077] At this time, the scraper conveyor runs at a speed of 1450×60% = 870 r / min.

[0078] Assume the current of the transfer conveyor is 62 A and the coal quantity scanned by the coal quantity scanner is 54. Substituting the above parameters into formulas (5) and (4), we get:

[0079]

[0080]

[0081] At this time, the transfer conveyor runs at a speed of 1450×60% = 870 r / min.

[0082] Example 6: This example is a specific example obtained by substituting specific data into the formula of Example 3 on the basis of the above Examples 1 - 3. Suppose the speed of the shearer is 2 m / min; the position frame number of the shearer is No. 3, the current of the cutting motor of the shearer is 25 A, and the currents of the head and tail motors of the scraper conveyor are 35 A.

[0083] Substituting the above parameters into formulas (2) and (1), we get:

[0084]

[0085]

[0086] At this time, the scraper conveyor runs at a speed of 1450×30% = 435 r / min.

[0087] Suppose the current of the transfer conveyor is 23 A and the coal quantity scanned by the coal quantity scanner is 24. Substituting the above parameters into formulas (5) and (4), we get:

[0088]

[0089]

[0090] At this time, the transfer conveyor runs at a speed of 1450×30% = 435 r / min.

Claims

1. A method for a speed regulation control system of a scraper conveyor in a fully mechanized mining face, using the following system: including a centralized controller, a transfer speed regulation control system, and a scraper conveyor speed regulation control system. The transfer speed regulation control system includes a transfer machine, a variable frequency motor, and a coal quantity detector. The scraper conveyor speed regulation control system includes a scraper conveyor, a head variable frequency motor, a tail variable frequency motor, and a shearer. The scraper conveyor is connected to the head variable frequency motor and the tail variable frequency motor. The centralized controller is connected to the transfer speed regulation control system and the scraper conveyor speed regulation control system respectively through communication cables. The coal quantity detector is arranged at the entrance of the transfer machine. It is characterized in that, The method steps are as follows: 1) Start the centralized controller to monitor the system communication; 2) Sequentially start the transfer system and the scraper conveyor system; 3) The coal quantity detector detects the coal quantity at the entrance of the transfer machine and feeds the detected data back to the centralized controller; 4) The centralized controller calculates the running speed of the scraper conveyor based on the current of the head frequency conversion motor, the current of the tail frequency conversion motor, the current of the shearer cutting motor, and the position information of the shearer, and synchronously adjusts the speed of the head frequency conversion motor and the tail frequency conversion motor of the scraper conveyor; 5) The centralized controller calculates the running speed of the transfer machine based on the coal quantity scanner and the current of the frequency conversion motor of the transfer machine, and adjusts the speed of the frequency conversion motor of the transfer machine; 6) The centralized controller compares the running speeds of the transfer machine and the scraper conveyor. Taking the higher running speed as the standard, the centralized controller sends an instruction to adjust the running speed to the transfer machine. If the running speed of the transfer machine is lower than that of the scraper conveyor, the transfer machine is adjusted to the running speed of the scraper conveyor. If the running speed of the transfer machine is higher than that of the scraper conveyor, it runs at the running speed of the transfer machine; In steps 4) and 5), the specific speed adjustment criteria for the frequency conversion motors of the scraper conveyor and the transfer machine are as follows: When the coal quantity index is above 80%, it runs at the rated speed; when the coal quantity index is 60% - 80%, it runs at 80% of the rated speed; when the coal quantity index is 40% - 60%, it runs at 60% of the rated speed; when the coal quantity index is 30% - 40%, it runs at 40% of the rated speed; when the coal quantity index is below 30%, it runs at 30% of the rated speed; The calculation method of the coal quantity index of the scraper conveyor is as follows: A e = A 1e K1 + A 2e K2 + A 3e K3 + A 4e K4 + A 5e K5 (3) Wherein, A is the coal quantity index of the scraper conveyor, represents the coal quantity index detected in real time, A e represents the rated coal quantity index; A1 to A5 respectively represent the shearer speed, the shearer position frame number, the current of the shearer cutting motor, the current of the head frequency conversion motor, and the current of the tail frequency conversion motor; A 1e ~A 5e respectively represent the maximum traction speed of the coal shearer, the maximum position frame number of the coal shearer, the rated current of the coal shearer, the rated current of the head frequency conversion motor, and the rated current of the tail frequency conversion motor; K1 to K5 are weight values respectively: 0.35, 0.24, 0.13, 0.14, 0.

14. This value is not a fixed value and can be adjusted according to the actual operation of the fully mechanized mining face equipment; The calculation method of the coal quantity index of the transfer machine is as follows: B e = B 1e K6 + B 2e K7(6) In the formula, is the coal quantity index of the scraper conveyor, represents the coal quantity index detected in real time, B e represents the rated coal quantity index; B1 and B2 respectively represent the current of the frequency conversion motor of the transfer machine and the coal quantity scanned by the coal quantity scanner; B 1e , B 2e They represent the rated current of the variable frequency motor of the transfer machine and the maximum coal quantity set by the coal quantity scanner respectively; K6 and K7 are weight values respectively: 0.45, 0.

55. This value is not a fixed value and can be adjusted according to the actual operation of the fully mechanized mining face equipment.

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