Electro-mechanical-hydraulic hybrid drive flight conveyer

Abstract

The application provides a kind of electro-mechanical hydraulic hybrid drive scraper conveyor, it relates to fully mechanized equipment technical field.The device includes execution module, control module and detection module;Through detection module, the rotational speed of each motor and hydraulic motor on the scraper conveyor is monitored in real time, when the scraper conveyor starts or the load changes exceed the limited interval, the flow size of pump station is controlled by PLC controller to control the speed of hydraulic motor.Referring to the database of hydraulic motor load size-lag time measured in the laboratory, the speed-time characteristic curve of hydraulic motor is obtained.PLC controller adjusts the speed of motor through frequency converter according to control program, so that the rotational speed characteristic of motor continuously fits the rotational speed characteristic of hydraulic motor, and the rotational speed difference between the two is kept within the limited range, completing the collaborative operation of multi-point hybrid drive.Reduces the power and torque of each driving device, ensures the synchronous operation of each driving, and the hydraulic drive can also relieve the impact, improves the stability of the scraper conveyor operation.

Description

Technical Field

[0001] This invention relates to the field of fully mechanized mining equipment technology, and in particular to an electromechanical-hydraulic hybrid driven scraper conveyor. Background Technology

[0002] Scraper conveyors, as transportation equipment in fully mechanized mining faces, are primarily responsible for underground coal transportation. With the demands of technological advancements, scraper conveyors are required to handle long-distance or ultra-long-distance transportation. In long-distance or ultra-long-distance operations, the significant speed difference between the head and tail sprockets during dual-drive operation leads to uneven load distribution, causing severe sprocket wear and chain breakage. Therefore, multi-point drive systems are often adopted. However, current multi-point drive scraper conveyors mostly use pure electric motors. While pure electric motors provide greater torque and transport capacity, their large moment of inertia makes them prone to vibration upon impact, hindering stable operation of the working face. Furthermore, the excessively large size of the head and tail sections of existing scraper conveyors makes it inconvenient for operators to work in confined spaces.

[0003] Therefore, it is necessary to design an electromechanical-hydraulic hybrid driven scraper conveyor to solve the above problems. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an electromechanical-hydraulic hybrid driven scraper conveyor.

[0005] An electromechanical-hydraulic hybrid driven scraper conveyor includes an execution module, a control module, and a detection module;

[0006] The execution module includes a drive device and a scraper chain of a scraper conveyor. The scraper chain forms a closed chain through the head frame assembly, middle trough, and tail assembly of the scraper conveyor. The drive device is connected to the sprocket shaft of the scraper conveyor. The sprocket meshes with the scraper chain to drive the scraper chain to rotate at the required speed and direction.

[0007] The drive device includes a frequency converter-controlled motor and a hydraulic motor. The frequency converter-controlled motor is installed at the head and tail of the scraper conveyor; the frequency converter-controlled motor and the hydraulic motor are installed at equal intervals in the middle trough.

[0008] The frequency converter controls the input voltage frequency of the motor to change the output speed, so that the motor speed is synchronized with the hydraulic motor speed.

[0009] The detection module includes a speed sensor and a coal quantity detection device. The speed sensor is installed on the sprocket shaft connected to the frequency converter-controlled motor and hydraulic motor. The coal quantity detection device is installed on the bearing surface above the frequency converter-controlled motor and hydraulic motor to obtain coal quantity information. The detection module monitors the operating status of the scraper conveyor in real time and transmits the speed and coal quantity signals to the PLC.

[0010] The control module comprises a computer, an A / D conversion device and a PLC controller, the PLC controller communicates with the execution module through a wireless Ethernet, the PLC controller collects analog signals of the rotating speed sensor and the coal quantity detection device through a signal line, and converts analog quantities transmitted by the rotating speed sensor and the coal quantity detection device into digital quantities through the A / D conversion device, the PLC controller communicates with the computer through a communication network, and the PLC controller analyzes data of the signals collected by the detection module and controls the motor and the hydraulic motor. The PLC controller in the control module processes and analyzes monitoring data of the detection module, and sends control instructions to the execution module through the wireless Ethernet, so that the running speeds of the motor and the hydraulic motor are adjusted; the PLC controller adjusts the rotating speed of the hydraulic motor by controlling the flow size of the pump station according to the load size, and adjusts the rotating speed of the motor by controlling the frequency converter, so that the two driving devices are cooperatively operated; the PLC controller transmits the obtained running data to the ground monitoring center, that is, the computer, through the communication network, so that the operating personnel can understand the running state and issue instructions;

[0011] The technical scheme has the beneficial effects that:

[0012] The mechanical-electric-hydraulic hybrid drive scraper conveyor provided by the application realizes real-time monitoring of the rotating speeds of the motors and the hydraulic motor on the scraper conveyor through the detection module, the PLC controller controls the rotating speed of the hydraulic motor by controlling the flow size of the pump station when the scraper conveyor is started or the load changes beyond the limited range. The hydraulic motor speed-time characteristic curve is obtained by taking the laboratory measured hydraulic motor load size-hysteresis time database as a reference. The PLC controller adjusts the rotating speed of the motor through the frequency converter according to the control program, so that the rotating speed characteristic of the motor continuously fits the rotating speed characteristic of the hydraulic motor, the rotating speed difference between the motor and the hydraulic motor is kept within the limited range, and the cooperative operation of the multi-point hybrid drive is completed. The power and the torque of each driving device are reduced, the synchronous operation of each driving device is ensured, the hydraulic drive can also relieve the impact, and the stability of the operation of the scraper conveyor is improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a schematic diagram of the multi-point driving scraper conveying device in the embodiment of the application;

[0014] In the figure, 1 is a head part, 2 is a middle part groove, 3 is a tail part, 4 is a motor driving device, and 5 is a hydraulic driving device.

[0015] Figure 2 It is a motor and hydraulic motor rotating speed-time characteristic curve in the embodiment of the application;

[0016] Figure 3 It is a motor and hydraulic motor rotating speed-time characteristic curve in the embodiment of the application.

[0017] Figure 4 Control principle diagram for the embodiment of the present application;

[0018] Figure 5 Workflow diagram for the embodiment of the present application. DETAILED DESCRIPTION

[0019] The specific embodiments of the present application are described in further detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but are not used to limit the scope of the present application.

[0020] As Figure 1 , the hydraulic motor and the electric motor are evenly mixed to realize the multi-point driving of the scraper conveyor. The sprocket wheels of the head, middle and tail of the scraper conveyor are engaged with the scraper chain to realize the overall operation of the device. The speed sensors are installed on the sprocket shafts connected with the hydraulic driving devices and the electric motor driving devices to monitor the rotation speed of each driving part in real time. The coal amount detection devices are arranged above each driving part to monitor the coal amount in the transportation range of each driving part. The coal amount detection devices of each driving part transmit the coal amount signals to the PLC controller, and the PLC analyzes and processes the load size in the transportation range of each driving part. The starting sequence is determined by comparing the load size of each driving part: the load of the driving part in the range of b-a is defined as the first level starting device; the load of the driving part in the range of c-b is defined as the second level starting device; the load of the driving part in the range of d-c is defined as the third level starting device; and so on (a > b > c > d > …). The PLC controls the driving parts to start in sequence from the first level, the second level, the third level, and so on. At the same time, after the load is determined, the PLC allocates the output power of the driving devices of each level according to the starting load and the required pulling force, and then controls the output torque of the electric motor. The rotation speed of the driving part can be determined according to the formula T = 9550P / n (in the formula: P—power, kW; n—rated rotation speed of the electric motor, r / min; T—torque, N·m.), to ensure the synchronization of the operation process. Figure 2 The hydraulic motor flow speed delay time under different loads is measured in the laboratory. When the running speed of the scraper conveyor needs to be adjusted, the motor speed-time characteristic curve in the speed regulation process of the hydraulic motor under the corresponding working condition is obtained from the laboratory measurement database. Based on the characteristic curve, the PLC controller gradually adjusts the rotation speed of the permanent magnet motor through the frequency converter to ensure that the rotation speed difference between the electric motor and the hydraulic motor is within the limited range, and to realize the synchronous operation of the electric motor and the hydraulic motor.

[0021] As Figure 4 , Figure 5 , the specific control method is to divide the rotation speed adjustment time Δt in a certain speed regulation process of the hydraulic motor into n equal parts, to take the hydraulic motor rotation speed change of each Δt / n as the reference, and to control the input voltage frequency of the electric motor through the frequency converter to change the output rotation speed. Figure 3By means of the PLC control program, the voltage is adjusted to frequency, so that the area surrounded by the motor speed-time curve and the hydraulic motor speed-time curve and the time axis in every Δt / n time is equal (S1=S2), that is, the length turned by the chain motor and the hydraulic motor in the same time is ensured to be the same and the speed is synchronous.

[0022] The above description is merely the preferred embodiments of the present disclosure and the explanation of the technical principles applied. It should be understood by those skilled in the art that the inventive scope involved in the embodiments of the present disclosure is not limited to the technical solutions formed by the specific combinations of the above technical features, and should also cover other technical solutions formed by the combinations of the above technical features or equivalent features without departing from the above inventive concept. For example, the technical solutions formed by the mutual replacement of the above features and the technical features with similar functions disclosed in the embodiments of the present disclosure (but not limited to) can be formed.

Claims

1. An electro-hydraulic hybrid drive flight conveyor, characterized in that, The execution module, the control module and the detection module are included. The execution module includes a driving device and a scraper chain of the scraper conveyor, the scraper chain forms a closed chain through a head frame assembly, a middle trough and a tail assembly of the scraper conveyor, the driving device is connected with a chain wheel shaft of the scraper conveyor, a chain wheel is engaged with the scraper chain to drive the scraper chain to run at a required speed and direction. The detection module includes a rotating speed sensor and a coal amount detection device, the rotating speed sensor is installed on the chain wheel shaft connected with the frequency converter controlled motor and the hydraulic motor, the coal amount detection device is installed above the frequency converter controlled motor and the hydraulic motor to obtain coal amount information, the detection module monitors the running state of the scraper conveyor in real time and transmits the rotating speed and coal amount signals to the PLC. The control module includes a computer, an A / D conversion device and a PLC controller, the PLC controller communicates with the execution module through wireless Ethernet, the PLC controller collects analog signals of the rotating speed sensor and the coal amount detection device through signal lines and converts analog quantities transmitted by the rotating speed sensor and the coal amount detection device into digital quantities through the A / D conversion device, the PLC controller communicates with the computer through a communication network, the PLC controller analyzes data of the signals collected by the detection module and cooperatively controls the motor and the hydraulic motor. The specific control mode is that the rotating speed adjustment time Δt in a certain speed regulation process of the hydraulic motor is equally divided by n, the hydraulic motor rotating speed change of each Δt / n is taken as a reference, the input voltage frequency of the frequency converter controlled motor is controlled to change the output rotating speed, the voltage frequency is controlled through the PLC control program, the motor rotating speed-time curve and the hydraulic motor rotating speed-time curve in each Δt / n time are equal to the area S1=S2 around the time axis, that is, the lengths rotated by the chain motor and the hydraulic motor in the same time are ensured to be the same and the speeds are synchronized. The driving device includes a frequency converter controlled motor and a hydraulic motor, the frequency converter controlled motor is installed at the head and tail of the scraper conveyor, the frequency converter controlled motor and the hydraulic motor are installed at the middle trough with equal intervals. The PLC controller of the control module processes and analyzes the monitoring data of the detection module and sends control instructions to the execution module through wireless Ethernet to adjust the running speeds of the motors and the hydraulic motor, the PLC controller adjusts the hydraulic motor rotating speed by controlling the pump station flow size according to the load size, adjusts the motor rotating speed by controlling the frequency converter, and makes the two driving devices cooperatively run, the PLC controller transmits the obtained running data to the ground monitoring center, that is, the computer through the communication network, so that the operating personnel can understand the running state and issue instructions.

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