Brake circuit of mining dump truck

Abstract

The utility model discloses a mining dump truck braking circuit, which relates to the technical field of equipment braking and comprises a power assembly, a power supply assembly and a power failure detector, the power supply assembly is provided with a high-voltage battery, the positive electrode and the negative electrode of the high-voltage battery are electrically connected with a positive electrode confluence busbar and a negative electrode confluence busbar respectively, and a first converter and a second converter are connected between the positive electrode confluence busbar and the negative electrode confluence busbar in parallel. The three-phase output end of the first converter and the three-phase output end of the second converter are electrically connected with the three-phase input end of the power assembly, and the three-phase output end of the second converter is provided with a contactor. The power-off detector is arranged at the three-phase output end of the first converter. In the using process, the power failure detector is used for detecting whether the three-phase output end of the first converter supplies power or not so as to select to control the contactor to be disconnected or connected, the problem that the mining dump truck cannot be braked when a single-set three-phase voltage output loop breaks down is solved, and the safety of the mining dump truck is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of equipment braking, and in particular to a braking circuit for a mining dump truck. Background Art

[0002] Traditional fuel-powered mining dump trucks have gradually become a key target of environmental protection management in the mining industry due to their high energy consumption and exhaust emissions. In response to energy transition and environmental protection requirements, an open-pit mine in Yunnan Province, based on the company's actual situation, carried out a pure electric transformation of the TR50 fuel-powered mining dump truck. The truck replaced the engine with a power battery, achieving zero emissions and low noise operation. In addition, an electric brake assisted parking function was added to the original vehicle's air brake to improve vehicle operation reliability. However, during operation, the modified pure electric mining dump truck repeatedly failed to operate due to a three-phase voltage output fault in the converter cabinet, especially under heavy-load downhill conditions. The failure of the air brake caused the vehicle to stop reliably due to the electric brake, posing a certain threat to the life safety of the operator.

[0003] Therefore, the present application proposes a braking circuit for a mining dump truck, which can solve the technical problem that the mining dump truck cannot brake when a single three-phase voltage output circuit fails. A spare three-phase voltage output circuit is set up, which can enable another three-phase voltage output circuit when one three-phase voltage output circuit fails, thereby ensuring the normal output of the braking power source of the mining dump truck. Utility Model Content

[0004] The main purpose of this application is to provide a braking circuit for a mining dump truck, aiming to solve the technical problem that the mining dump truck cannot brake when a single three-phase voltage output circuit fails.

[0005] To achieve the above objectives, this application provides the following technical solutions:

[0006] A braking circuit for a mining dump truck, comprising:

[0007] Power components;

[0008] A power supply assembly, comprising a high-voltage battery, wherein the positive and negative electrodes of the high-voltage battery are electrically connected to a positive busbar and a negative busbar, respectively; a first converter and a second converter are connected in parallel between the positive busbar and the negative busbar; the three-phase output terminals of the first converter and the second converter are electrically connected to the three-phase input terminals of the power assembly; and a contactor is provided at the three-phase output terminals of the second converter;

[0009] A power failure detector is provided at the three-phase output end of the first converter, and detects whether the three-phase output end of the first converter is powered or not, so as to selectively control the contactor to be disconnected or connected.

[0010] As a further improvement of the present application, the braking circuit of the mining dump truck also includes a controller, which is electrically connected to the contactor and the power off detector respectively. The controller pre-stores a number of control instructions. The controller receives the signal output by the power off detector, matches the corresponding control instructions to calculate and analyze the signal, and matches the corresponding control instructions to control the disconnection / connection of the contactor.

[0011] As a further improvement of the present application, the power supply component also includes a thermal relay provided at the three-phase input end of the power component, and the thermal relay is used to protect the power component from overload and short circuit.

[0012] As a further improvement of the present application, the voltage output by the high-voltage battery is 800V high-voltage alternating current, and the voltage output by the first converter and the second converter is 380V direct current.

[0013] As a further improvement of the present application, the power component is an air compressor, and the air compressor is used to output the air brake source of the mining dump truck.

[0014] The technical solution provided by this application may have the following beneficial effects:

[0015] During use of this application, the first inverter converts the direct current output by the high-voltage battery into alternating current and transmits it to the power assembly, and uses a power-off detector to detect whether the voltage at the three-phase output end of the first inverter is normal. When the first inverter fails, the control contactor connects the power supply between the second inverter and the power assembly, thereby solving the problem that the mining dump truck cannot brake when a single three-phase voltage output circuit fails, thereby ensuring the safety of the mining dump truck. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 This is a structural diagram of the braking circuit of a mining dump truck;

[0018] Reference numerals:

[0019] 1. Power assembly; 2. Power failure detector; 3. High-voltage battery; 4. Positive busbar; 5. Negative busbar; 6. First converter; 7. Second converter; 8. Contactor; 9. Thermal relay; 10. Controller. DETAILED DESCRIPTION

[0020] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0022] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0023] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0024] In this application, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0025] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

[0026] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

[0027] Figure 1 An embodiment of a braking circuit for a mining dump truck of the present application is shown. Figure 1 In this embodiment, the braking circuit of a mining dump truck includes: a power component, a power supply component and a power failure detector.

[0028] Among them, see Figure 1 The power supply assembly includes a high-voltage battery, a positive busbar, a negative busbar, a first converter, a second converter, and a contactor. The high-voltage battery is installed on the mining dump truck, with the positive and negative poles of the high-voltage battery electrically connected to the positive and negative busbars, respectively. The first converter and the second converter are connected in parallel to the positive and negative busbars. The three-phase output terminals of the first converter and the second converter are electrically connected to the three-phase input terminals of the power assembly. The contactor is installed at the three-phase output terminals of the second converter and controls the on / off switching of the three-phase output terminals of the second converter. A power failure detector is installed at the three-phase output terminals of the first converter and is used to detect whether the voltage at the three-phase output terminals of the first converter is normal. When the mining dump truck brakes, the high-voltage direct current output of the high-voltage battery is converted into alternating current by the first converter, which provides electrical energy to the power assembly. During this process, a power failure detector monitors the voltage output by the first converter in real time. If the first converter's output voltage fails, the control contactor connects the circuit between the second converter and the power assembly, supplying power to the power assembly through the second converter. This solves the problem of a mining dump truck being unable to brake when a single three-phase voltage output circuit fails, ensuring safe operation.

[0029] It should be noted that, in this embodiment, the initial state of the contactor is the disconnected state, which ensures that only one three-phase voltage output circuit is working during the operation of the braking circuit of the mining dump truck.

[0030] Further, see Figure 1 The power supply component also includes a thermal relay, which is used to protect the power component from overload and short circuit.

[0031] Optionally, the power component is an air compressor, which is used to output an air brake source of the mining dump truck to brake the mining dump truck according to demand.

[0032] Optionally, the first converter and the second converter are DC / AC converters for converting direct current into alternating current.

[0033] Optionally, the voltage output by the high-voltage battery is 800V high-voltage direct current, and the voltage output by the first converter and the second converter is 380V alternating current.

[0034] Optionally, when the value detected by the power failure detector is equal to the set value, the output value is 1; when the value detected by the power failure detector is not equal to the set value, the output value is 0.

[0035] Further, see Figure 1 The braking circuit of the mining dump truck also includes a controller, which is electrically connected to the contactor and the power-off detector respectively. The controller pre-stores a number of control instructions. The controller receives the signal output by the power-off detector, matches the corresponding control instructions to calculate and analyze the signal, and matches the corresponding control instructions to control the disconnection / connection of the contactor.

[0036] It should be noted that this embodiment focuses on the working principle of the controller. The specific structure of the controller is not the focus of this embodiment and is existing technology. This embodiment and the accompanying drawings have given the installation location or area of the controller, and the specific structure of the controller will not be repeated.

[0037] To further illustrate, this embodiment focuses on the working principles of the high-voltage battery, the positive busbar, the negative busbar, the first converter, the second converter, the contactor, the power failure detector and the thermal relay. The specific structure of these components is not the focus of this embodiment and is the prior art. This embodiment and the accompanying drawings have given the installation positions and areas of these components, and the specific structures of the high-voltage battery, the positive busbar, the negative busbar, the first converter, the second converter, the contactor, the power failure detector and the thermal relay are no longer repeated.

[0038] In this embodiment, the first converter converts the direct current output by the high-voltage battery into alternating current and transmits it to the power assembly, and uses a power-off detector to detect whether the voltage at the three-phase output end of the first converter is normal. When the first converter fails, the control contactor connects the power supply between the second converter and the power assembly, thereby solving the problem that the mining dump truck cannot brake when a single three-phase voltage output circuit fails, thereby ensuring the safety of the mining dump truck.

[0039] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the present application. The dimensions of the drawings are not related to the specific objects, and the dimensions of the objects can be changed arbitrarily.

Claims

1. A braking circuit for a mining dump truck, characterized in that: include: Power components; A power supply assembly, comprising a high-voltage battery, wherein the positive and negative electrodes of the high-voltage battery are electrically connected to a positive busbar and a negative busbar, respectively; a first converter and a second converter are connected in parallel between the positive busbar and the negative busbar; the three-phase output terminals of the first converter and the second converter are electrically connected to the three-phase input terminals of the power assembly; and a contactor is provided at the three-phase output terminals of the second converter; A power failure detector is provided at the three-phase output end of the first converter, and detects whether the three-phase output end of the first converter is powered or not, so as to selectively control the contactor to be disconnected or connected.

2. The braking circuit of a mining dump truck according to claim 1, characterized in that: It also includes a controller, which is electrically connected to the contactor and the power off detector respectively. The controller pre-stores a plurality of control instructions. The controller receives the signal output by the power off detector, matches the corresponding control instructions to calculate and analyze the signal, and matches the corresponding control instructions to control the disconnection / connection of the contactor.

3. The braking circuit of a mining dump truck according to claim 1, characterized in that: The power supply component also includes a thermal relay provided at the three-phase input end of the power component, and the thermal relay is used to protect the power component from overload and short circuit.

4. The braking circuit of a mining dump truck according to claim 1, characterized in that: The voltage output by the high-voltage battery is 800V high-voltage alternating current, and the voltage output by the first converter and the second converter is 380V direct current.

5. The braking circuit of a mining dump truck according to claim 1, characterized in that: The power component is an air compressor, which is used to output the air brake power of the mining dump truck.

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