Mining shuttle car frequency conversion traction system

Abstract

The invention belongs to the technical field of mining shuttle car refitting, and aims to solve the problems that an existing electric control box is large in size and not beneficial to whole car arrangement, and high-frequency switching devices in the electric control box are concentrated, not beneficial to electromagnetic compatibility processing and low in reliability. The mining shuttle car frequency conversion traction system is characterized in that an electric signal processing module is arranged in an explosion-proof electric cabinet, three-phase alternating current directly or indirectly introduced by a shuttle car cable drum enters a main cavity through a wiring cavity in the explosion-proof electric cabinet and is connected with a switch, and the switch, an input reactor and a rectifier are sequentially connected; the rectifier is connected with the vehicle-mounted controller through a CAN bus; a direct-current power supply output by the rectifier is respectively introduced into a left traction inverter in the left traction explosion-proof motor box and a right traction inverter in the right traction explosion-proof motor box; and the vehicle-mounted controller is respectively connected with the left traction inverter and the right traction inverter through a CAN (Controller Area Network) bus. The device can reduce the volume of the explosion-proof electric cabinet, avoids the risk of cable extrusion, and improves the reliability of a traction system.

Description

Technical Field

[0001] The invention belongs to the technical field of mining shuttle car modification, and in particular relates to a mining shuttle car variable frequency traction system. Background Art

[0002] The mining shuttle car is an important transportation equipment in the short-wall mining technology system of coal mines. Its main function is to transfer the coal mined by the tunneling equipment to the supporting transportation equipment to achieve fast short-distance transportation, which can greatly give play to the advantages of high production efficiency of the short-wall mining process. The mining shuttle car is a left-right drive structure, and the traction motor is an explosion-proof variable frequency motor. The traction control of the shuttle car is achieved through variable frequency speed regulation technology.

[0003] The inverter part of the existing shuttle car traction system is also placed inside the explosion-proof electric control box. The inside of the explosion-proof motor housing only has motor functions. Therefore, the traction motor encoder signal line, temperature control switch signal line, temperature sensor signal line and motor main cable line need to be connected to the inside of the explosion-proof electric control box through the traction explosion-proof motor box introduction device. This not only requires a large number and variety of explosion-proof cables for connection, but also makes it very easy for the cables to be worn or squeezed in a complex environment such as underground coal mines. This type of fault detection and handling is very troublesome, time-consuming and labor-intensive. Summary of the invention

[0004] In order to solve at least one of the above technical problems existing in the prior art, the present invention provides a variable frequency traction system for a mining shuttle car.

[0005] The present invention is implemented by the following technical solutions: a variable frequency traction system for a mining shuttle car, including an electric signal processing module, a left traction module, a right traction module, an explosion-proof electric control box, a left traction explosion-proof motor box, and a right traction explosion-proof motor box;

[0006] The electric signal processing module is built into the explosion-proof electric control box. The electric signal processing module includes a switch, an input reactor, a rectifier and an on-board controller. The three-phase AC power directly or indirectly introduced by the cable drum of the shuttle car enters the main cavity through the wiring cavity in the explosion-proof electric control box and is connected to the switch. The switch, the input reactor and the rectifier are connected in sequence, and the rectifier and the on-board controller are connected through the CAN bus.

[0007] The left traction module is built into the left traction explosion-proof motor box, and the right traction module is built into the right traction explosion-proof motor box. The left traction module includes a left traction inverter and a left traction motor connected in sequence, and the right traction module includes a right traction inverter and a right traction motor connected in sequence; the DC power supply output by the rectifier is respectively introduced into the left traction inverter in the left traction explosion-proof motor box and the right traction inverter in the right traction explosion-proof motor box, and the on-board controller is respectively connected to the left traction inverter and the right traction inverter through the CAN bus.

[0008] Preferably, the switch of the electrical signal processing module comprises a circuit breaker or a contactor or a series combination of a circuit breaker and a contactor.

[0009] Preferably, when the switch is a series combination of a circuit breaker and a contactor, the input end of the circuit breaker is connected to 1140V three-phase AC, the output end of the circuit breaker is connected to the input end of the contactor, and the output end of the contactor is connected to the traction circuit; the output end of the circuit breaker is connected to several circuits in parallel with the contactor, including a transfer circuit, an oil pump circuit, and a transformer circuit.

[0010] Preferably, the input reactor is used for filtering and current limiting, and the 1140V three-phase AC power enters the rectifier through the input reactor. The rectifier performs six-pulse uncontrolled rectification through the anti-parallel freewheeling diode of the IGBT, and energy is fed back through the IGBT when the bus voltage rises to the threshold value; the DC side of the rectifier is connected to a capacitor for suppressing voltage pulsation, and a buffer circuit is connected between the rectifier and the capacitor.

[0011] Preferably, the DC power supply rectified by the rectifier is introduced into the wiring cavity of the left traction explosion-proof motor box and the right traction explosion-proof motor box through the wiring terminals in the main cavity of the explosion-proof electric control box, and is respectively connected to the left traction inverter and the right traction inverter located in the main cavity of the left traction explosion-proof motor box and the right traction explosion-proof motor box through the wiring terminals in the wiring cavity. The left traction inverter and the right traction inverter invert the DC power into AC power to drive the corresponding traction motor to rotate, and regulate the speed of the traction motor by controlling the PWM wave.

[0012] Preferably, the control instructions are given to the rectifier, left traction inverter and right traction inverter via the vehicle-mounted controller through the CAN bus, and the rectifier, left traction inverter and right traction inverter feed back status information to the vehicle-mounted controller via the CAN bus.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] This device has only one input inductor and one rectifier, and the left traction inverter and the right traction inverter are moved from the explosion-proof electric control box to the corresponding traction explosion-proof motor box, which can reduce the volume of the explosion-proof electric control box, facilitate the layout of the explosion-proof electric control box, and increase the shuttle car coal transportation space; at the same time, the three-phase power cable of the traction motor, the motor speed encoder signal line, the motor temperature control switch signal line, the motor temperature sensor signal line, etc. can be directly connected to the corresponding traction inverter without leaving the traction explosion-proof motor box, which can avoid the risk of cable extrusion and improve the reliability of the traction system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. 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 paying creative work.

[0016] Figure 1 is a block diagram of the electrical system of the present invention;

[0017] Figure 2 It is a schematic diagram of component connection at a switch in an explosion-proof electric control box of the present invention. DETAILED DESCRIPTION

[0018] In conjunction with the drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention are clearly and completely described. 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 implementation methods obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention. It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0020] The present invention provides an embodiment:

[0021] like Figure 1 , Figure 2 As shown, a variable frequency traction system for a mining shuttle car includes an electric signal processing module, a left traction module, a right traction module, an explosion-proof electric control box, a left traction explosion-proof motor box, and a right traction explosion-proof motor box;

[0022] The electric signal processing module is built into the explosion-proof electric control box. The electric signal processing module includes a switch, an input reactor, a rectifier, an on-board controller and other components required by the shuttle car electric control system. The three-phase AC power directly or indirectly introduced by the shuttle car cable drum enters the main cavity through the wiring cavity in the explosion-proof electric control box and is connected to the switch. The switch, the input reactor and the rectifier are connected in sequence, and the rectifier and the on-board controller are connected through the CAN bus.

[0023] The left traction module is built into the left traction explosion-proof motor box, and the right traction module is built into the right traction explosion-proof motor box. The left traction module includes a left traction inverter and a left traction motor connected in sequence, and the right traction module includes a right traction inverter and a right traction motor connected in sequence; the DC power supply output by the rectifier is respectively introduced into the left traction inverter in the left traction explosion-proof motor box and the right traction inverter in the right traction explosion-proof motor box, and the on-board controller is respectively connected to the left traction inverter and the right traction inverter through the CAN bus.

[0024] In this embodiment, the switch of the electrical signal processing module includes a circuit breaker or a contactor or a series combination of a circuit breaker and a contactor or other types of disconnecting elements. When the switch is a series combination of a circuit breaker and a contactor, the input end of the circuit breaker is connected to 1140V three-phase AC, the output end of the circuit breaker is connected to the input end of the contactor, and the output end of the contactor is connected to the traction circuit power supply, and can be directly connected to the input reactor; in addition to the disconnection function, the circuit breaker also has a short-circuit protection function, and the output end of the circuit breaker is connected to a number of circuits connected in parallel with the contactor, including a transfer circuit, an oil pump circuit, and a transformer circuit.

[0025] The input reactor is on-board and is used for filtering and current limiting. The 1140V three-phase AC power enters the rectifier through the input reactor. The rectifier performs six-pulse uncontrolled rectification through the anti-parallel freewheeling diode of the IGBT. When the bus voltage rises to the threshold, energy is fed back through the IGBT. The DC side of the rectifier is connected to a capacitor for suppressing voltage pulsation, and a buffer circuit is connected between the rectifier and the capacitor.

[0026] The DC power rectified by the rectifier is introduced into the wiring chamber of the left traction explosion-proof motor box and the right traction explosion-proof motor box through the wiring terminals in the main chamber of the explosion-proof electric control box, and is connected to the left traction inverter and the right traction inverter located in the main chamber of the left traction explosion-proof motor box and the right traction explosion-proof motor box through the wiring terminals in the wiring chamber. The left traction inverter and the right traction inverter invert the DC power into AC power to drive the corresponding traction motor to rotate, and adjust the speed of the traction motor by controlling the PWM wave. The control command is given to the rectifier, the left traction inverter and the right traction inverter through the CAN bus via the on-board controller, and the rectifier, the left traction inverter and the right traction inverter feed back the status information to the on-board controller through the CAN bus.

[0027] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A variable frequency traction system for a mining shuttle car, characterized in that: It includes an electric signal processing module, a left traction module, a right traction module, an explosion-proof electric control box, a left traction explosion-proof motor box, and a right traction explosion-proof motor box; The electric signal processing module is built into the explosion-proof electric control box. The electric signal processing module includes a switch, an input reactor, a rectifier and an on-board controller. The three-phase AC power directly or indirectly introduced by the cable drum of the shuttle car enters the main cavity through the wiring cavity in the explosion-proof electric control box and is connected to the switch. The switch, the input reactor and the rectifier are connected in sequence, and the rectifier and the on-board controller are connected through the CAN bus. The left traction module is built into the left traction explosion-proof motor box, and the right traction module is built into the right traction explosion-proof motor box. The left traction module includes a left traction inverter and a left traction motor connected in sequence, and the right traction module includes a right traction inverter and a right traction motor connected in sequence; the DC power supply output by the rectifier is respectively introduced into the left traction inverter in the left traction explosion-proof motor box and the right traction inverter in the right traction explosion-proof motor box, and the on-board controller is respectively connected to the left traction inverter and the right traction inverter through the CAN bus.

2. A variable frequency traction system for a mining shuttle car according to claim 1, characterized in that: The switch of the electrical signal processing module includes a circuit breaker or a contactor or a series combination of a circuit breaker and a contactor.

3. A variable frequency traction system for a mining shuttle car according to claim 2, characterized in that: When the switch is a series combination of a circuit breaker and a contactor, the input end of the circuit breaker is connected to 1140V three-phase AC, the output end of the circuit breaker is connected to the input end of the contactor, and the output end of the contactor is connected to the traction circuit; the output end of the circuit breaker is connected to several circuits in parallel with the contactor, including a transfer circuit, an oil pump circuit, and a transformer circuit.

4. A mine shuttle vehicle frequency conversion traction system according to claim 1, characterized in that: The input reactor is used for filtering and current limiting. The 1140V three-phase AC power enters the rectifier through the input reactor. The rectifier performs six-pulse uncontrolled rectification through the IGBT anti-parallel freewheeling diode. When the bus voltage rises to the threshold, energy is fed back through the IGBT. The DC side of the rectifier is connected to a capacitor for suppressing voltage pulsation, and a buffer circuit is connected between the rectifier and the capacitor.

5. A mine shuttle vehicle frequency conversion traction system according to claim 4, characterized in that: The DC power supply rectified by the rectifier is introduced into the wiring cavity of the left traction explosion-proof motor box and the right traction explosion-proof motor box through the wiring terminals in the main cavity of the explosion-proof electric control box, and is connected to the left traction inverter and the right traction inverter located in the main cavity of the left traction explosion-proof motor box and the right traction explosion-proof motor box respectively through the wiring terminals in the wiring cavity. The left traction inverter and the right traction inverter invert the DC power into AC power to drive the corresponding traction motor to rotate, and regulate the speed of the traction motor by controlling the PWM wave.

6. A mine shuttle vehicle frequency conversion traction system according to claim 1, characterized in that: The control instructions are given to the rectifier, left traction inverter and right traction inverter through the on-board controller via the CAN bus. At the same time, the rectifier, left traction inverter and right traction inverter feed back status information to the on-board controller via the CAN bus.

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