Alternating current doubling device and engineering machinery

Abstract

The invention relates to the technical field of power supply, and discloses an alternating current doubling device and engineering machinery, and the alternating current doubling device comprises a generator interface; an AC pile interface; a charging output interface; the first power supply line is connected with the generator interface and the charging output interface; the second power supply line is connected with the alternating current pile interface and the charging output interface; the interlocking structure is respectively connected with the first power supply circuit and the second power supply circuit; and the interlocking structure is used for controlling one of the first power supply circuit and the second power supply circuit to be switched on and controlling the other power supply circuit to be switched off. By constructing the first power supply line and the second power supply line, the scene limitation of a single energy compensation mode is broken, and the problem of energy compensation when no charging facility exists in a remote area is solved. Meanwhile, the interlocking structure forcibly controls the two power supply lines, one power supply line is switched on, the other power supply line is switched off, and the electric shock risk caused when one power supply line is powered on and the other power supply line is electrified is eliminated.

Description

Technical Field

[0001] This application relates to the field of power supply technology, specifically to AC parallel line devices and engineering machinery. Background Technology

[0002] New energy construction machinery (such as cranes) often operate in remote areas, where current charging infrastructure relies on external AC charging stations, which presents significant limitations. Remote areas lack charging facilities, making timely charging difficult. Summary of the Invention

[0003] This application provides an AC parallel line device and engineering machinery to solve the aforementioned problem of untimely charging.

[0004] In a first aspect, this application provides an AC parallel connection device, the AC parallel connection device comprising: Generator interface; AC charging pile interface; Charging output interface; A first power supply line connecting the generator interface and the charging output interface; A second power supply line connecting the AC charging pile interface and the charging output interface; An interlocking structure that is connected to the first power supply line and the second power supply line respectively; The interlocking structure is used to control one of the first power supply lines or the second power supply line to be turned on, and to control the other power supply line to be turned off.

[0005] In this embodiment, by setting up a generator interface, an AC charging pile interface, and a charging output interface, a first power supply line and a second power supply line are constructed. This breaks the scenario limitation of a single energy replenishment method and solves the energy replenishment problem in remote areas without charging facilities. Simultaneously, the interlocking structure forcibly controls the two power supply lines; one power supply line is on while the other is off, fundamentally eliminating circuit conflicts caused by simultaneous power supply from two lines. This eliminates the risk of electric shock when one line is energized while the other is energized, ensuring the safety of the equipment circuitry and the operation of personnel.

[0006] In one optional implementation, the generator interface is used to connect to the AC power of the generator set; the AC charging pile interface is used to connect to the AC power of an external AC charging pile. The charging output interface is connected to an external electrical device and is used to output AC power from the generator set to the electrical device when the first power supply line is connected, or to output AC power from the AC charging pile to the electrical device when the second power supply line is connected.

[0007] In this embodiment, when replenishing power, it is only necessary to select to connect a generator or AC charging pile according to the scenario. After the power supply line is connected, the power will be automatically transmitted to the electrical equipment through the corresponding path, without the need for manual switching of lines or adjustment of interface connections.

[0008] In one alternative implementation, the first power supply line includes a first AC contactor; the second power supply line includes a second AC contactor. The interlocking structure is disposed between the first AC contactor and the second AC contactor; the interlocking structure is used to control the closure of the first AC contactor or one of the first AC contactors; wherein, when the first AC contactor is closed, the first power supply line is connected; when the second AC contactor is closed, the second power supply line is connected.

[0009] In this embodiment, the first power supply line is controlled to switch on and off via a first AC contactor, and the second power supply line is controlled to switch on and off via a second AC contactor. Compared to the traditional direct parallel design, the main contacts of the contactors can achieve physical isolation and precise switching of the power supply lines. When a power supply line needs recharging, the corresponding contactor's main contacts close to connect the power supply line, while the main contacts of the contactor for the other power supply line open, preventing the two power supply lines from being directly connected. The contactors respond quickly and can switch lines rapidly according to recharging needs, improving the convenience of recharging operations. At the same time, the main contacts of the contactors have high voltage resistance and impact resistance characteristics, making them suitable for high voltage recharging scenarios in engineering machinery and extending the service life of the lines.

[0010] In one alternative implementation, both the first AC contactor and the second AC contactor include main contacts; Both the generator interface and the AC charging terminal include a live wire terminal, a neutral wire terminal, and a protective ground wire terminal; the protective ground wire terminal is grounded. The first end of the main contact of the first AC contactor is connected to the live wire terminal and the neutral wire terminal of the generator interface respectively, and the second end of the main contact of the first AC contactor is connected to the charging output interface; the on / off state of the first power supply line is controlled by closing or opening the main contact; The first end of the main contact of the second AC contactor is connected to the live wire terminal and the neutral wire terminal of the AC terminal block interface, respectively, and the second end of the main contact of the second AC contactor is connected to the charging output interface; the on / off state of the second power supply line is controlled by closing or opening the main contact.

[0011] In this embodiment, both the generator interface and the AC terminal block interface are equipped with a live wire terminal, a neutral wire terminal, and a protective grounding wire terminal. The main contacts of the first and second AC contactors are connected to the corresponding terminals. On one hand, the leakage current is conducted to the ground through the protective grounding wire terminal, effectively preventing electric shock accidents caused by line leakage and improving the electrical safety of the equipment. On the other hand, the corresponding connection between the main contacts and the terminals ensures a clear current path, avoiding problems such as short circuits and line burnout caused by incorrect wiring, ensuring stable power transmission, and simplifying the subsequent line maintenance process, reducing the difficulty of operation and maintenance.

[0012] In one alternative embodiment, both the first AC contactor and the second AC contactor further include a coil; the coil is used to close the main contacts when energized and to open the main contacts when de-energized.

[0013] In one optional embodiment, the interlocking structure includes an electrical interlocking component; the electrical interlocking component includes a first auxiliary contact disposed on the first AC contactor; The first auxiliary contact is connected in series to the power supply line of the coil of the second AC contactor; Specifically, after the coil of the first AC contactor is energized, the first auxiliary contact is disconnected to cut off the power supply line to the coil of the second AC contactor and disconnect the second power supply line.

[0014] In this embodiment, both the first and second AC contactors are equipped with coils. By utilizing the characteristic of the coils to close the main contacts when energized and open the main contacts when de-energized, the power supply line can be electrically controlled. There is no need for manual switching of the line; the power supply path can be switched simply by controlling the coil to turn on and off through circuit signals. This adapts to the needs of automated operation of engineering machinery, reducing manual operation steps and the probability of errors. Moreover, the coil control has a fast response speed and can switch the line instantly when the power supply demand changes, avoiding power transmission interruption and ensuring power supply efficiency. At the same time, the coil has low power consumption and will not increase the energy consumption burden of the equipment.

[0015] In one optional embodiment, the interlocking structure includes an electrical interlocking assembly; the electrical interlocking assembly further includes a second auxiliary contact disposed on the second AC contactor; The second auxiliary contact is connected in series to the power supply line of the coil of the first AC contactor; Specifically, after the coil of the second AC contactor is energized, the second auxiliary contact is disconnected to cut off the power supply line of the coil of the first AC contactor and disconnect the first power supply line.

[0016] In this embodiment, the first auxiliary contact of the first AC contactor is connected in series to the power supply line of the second AC contactor coil to form a one-way electrical interlock: when the first AC contactor coil is energized (generator set replenishment), the first auxiliary contact is simultaneously disconnected, directly cutting off the power supply to the second AC contactor coil, forcing its main contact to remain in the open state, and completely eliminating the possibility of mis-connection of the AC charging line.

[0017] In one optional implementation, the interlocking structure further includes a mechanical interlocking component; The mechanical interlock assembly is disposed between the iron core of the first AC contactor and the iron core of the second AC contactor; The mechanical interlock assembly is used to restrict the core of the second AC contactor from engaging after the coil of the first AC contactor is energized, so as to disconnect the second power supply line. After the coil of the second AC contactor is energized, it restricts the iron core of the first AC contactor from engaging, thereby disconnecting the first power supply line.

[0018] In this embodiment, the mechanical interlock assembly is disposed between the iron cores of the first and second AC contactors, and restricts the iron core from engaging through a physical structure: when the coil of one contactor is energized, the engagement of the iron core will push the mechanical interlock assembly to move towards the other contactor, directly locking its iron core and preventing it from engaging, thus physically blocking the conduction of the other power supply line; this solution is not affected by electrical signal interference, and even if there are problems such as short circuits or signal disturbances in the circuit, the mechanical structure can still maintain the interlock state, forming a dual protection of electrical and mechanical protection with the electrical interlock, completely eliminating the possibility of two power supplies being supplied at the same time, which is especially suitable for safety assurance in complex operating environments of engineering machinery.

[0019] Secondly, this application also provides an engineering machinery, including the AC paralleling device of the first aspect or any corresponding embodiment described above.

[0020] In this embodiment, the engineering machinery integrates the aforementioned AC parallel connection device, which on the one hand solves the limitations of traditional equipment charging scenarios: in remote areas, it can be charged independently by the vehicle-mounted generator set, and when it is close to charging facilities, it can use external AC charging piles, thereby improving the equipment's operating range and flexibility; on the other hand, the dual interlocking mechanism eliminates charging safety hazards, reduces the probability of equipment circuit failure and the risk of electric shock to personnel; at the same time, compared with traditional engine and range extender charging, the vehicle-mounted generator set is cheaper.

[0021] In one alternative embodiment, the construction machinery further includes a generator set connected to the AC parallel connection device.

[0022] In this embodiment, the construction machinery directly integrates a generator set and connects it to an AC parallel connection device, eliminating the need for an external generator set. This reduces equipment handling and connection steps, improving the convenience of power replenishment. The generator set and parallel connection device have stronger compatibility and more stable wiring connections, avoiding power loss or malfunctions caused by interface incompatibility or loose wiring when connecting external equipment. Simultaneously, the integrated design optimizes the internal space layout of the equipment, reduces external wiring exposure, lowers the risk of wiring damage in complex operating environments, and further enhances the overall reliability and ease of maintenance of the equipment. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the AC parallel line device according to an embodiment of this application; Figure 2 This is a schematic diagram of the specific structure of the AC parallel line device according to an embodiment of this application.

[0025] In the diagram: Generator interface-1, AC charging pile interface-2, charging output interface-3, interlock structure-4. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0029] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0030] Figure 1 This is a schematic diagram of the structure of the AC parallel line device according to an embodiment of this application.

[0031] like Figure 1 As shown, this application embodiment provides an AC parallel line device, which includes: Generator interface 1; AC pile interface 2; Charging output interface 3.

[0032] The first power supply line connects generator interface 1 and charging output interface 3.

[0033] A second power supply line connecting AC charging pile interface 2 and charging output interface 3.

[0034] Interlocking structure 4, which is connected to the first power supply line and the second power supply line respectively.

[0035] The interlocking structure 4 is used to control one of the first or second power supply lines to be turned on and to control the other power supply line to be turned off.

[0036] In this embodiment, by setting up generator interface 1, AC charging pile interface 2, and charging output interface 3, a first power supply line and a second power supply line are constructed, breaking the scenario limitation of a single energy replenishment method and solving the energy replenishment problem in remote areas without charging facilities. At the same time, the interlocking structure 4 forcibly controls the two power supply lines, with one power supply line conducting and the other disconnected, fundamentally eliminating circuit conflicts caused by two power supply lines supplying power simultaneously, eliminating the risk of electric shock when one power supply line is energized while the other is energized, and ensuring the safety of equipment circuits and personnel operation.

[0037] In one optional implementation, generator interface 1 is used to connect to the AC power of a generator set. AC charging pile interface 2 is used to connect to the AC power of an external AC charging pile.

[0038] The charging output interface 3 is connected to external electrical equipment and is used to output AC power from the generator set to the electrical equipment when the first power supply line is connected, or to output AC power from the AC charging pile to the electrical equipment when the second power supply line is connected.

[0039] In this embodiment, as an example, the electrical equipment can be a battery, an on-board charger (OBC), or a high-voltage power module (such as the electric drive system of a crane). The on-board charger can convert AC power input from a generator or AC charging pile into DC power to charge the battery, while the high-voltage power module can directly use AC power to drive the equipment, adapting to different power needs.

[0040] In this embodiment, in scenarios without external AC charging station coverage (such as remote construction sites or field operation sites), generator interface 1 is connected to a portable three-phase generator set. The generator set connects to generator interface 1 via a standardized plug, requiring no additional modification to the interface structure. Upon connection, the starting conditions of the first power supply line are triggered, providing power to the equipment and solving the problem of inconvenient power supply in remote areas. In scenarios with external AC charging station coverage (such as engineering vehicle parking lots or charging stations), generator interface 1 is connected to an idle sealing component. Since no generator set is needed for power supply, sealing generator interface 1 with the sealing component prevents dust, rainwater, and other impurities from entering the interface, avoiding terminal oxidation or short circuits, while also ensuring a clean appearance and electrical safety.

[0041] In this embodiment, when replenishing power, it is only necessary to select to connect a generator or AC charging pile according to the scenario. After the power supply line is connected, the power will be automatically transmitted to the electrical equipment through the corresponding path, without the need for manual switching of lines or adjustment of interface connections.

[0042] In one alternative implementation, such as Figure 2 As shown, the first power supply line includes a first AC contactor KM1. The second power supply line includes a second AC contactor KM2.

[0043] An interlocking structure 4 is disposed between the first AC contactor KM1 and the second AC contactor KM2. The interlocking structure 4 is used to control the closing of either the first AC contactor KM1 or one of the first AC contactors KM1. Specifically, when the first AC contactor KM1 is closed, the first power supply line is connected. When the second AC contactor KM2 is closed, the second power supply line is connected.

[0044] In this embodiment, as an example, the first AC contactor KM1 and the second AC contactor KM2 can be 380V AC contactors, and the coil voltage is also 380V.

[0045] In this embodiment, the first power supply line is controlled by a first AC contactor KM1, and the second power supply line is controlled by a second AC contactor KM2. Compared to the traditional direct parallel design, the main contacts of the contactors can achieve physical isolation and precise switching of the power supply lines. When a power supply line needs recharging, the corresponding contactor's main contacts close to connect the power supply line, while the main contacts of the contactor for the other power supply line open, preventing direct connection between the two power supply lines. The contactors respond quickly and can switch lines rapidly according to recharging needs, improving the convenience of recharging operations. Simultaneously, the main contacts of the contactors have high-voltage resistance and impact resistance characteristics, making them suitable for high-voltage recharging scenarios in engineering machinery and extending the service life of the lines.

[0046] In one alternative implementation, both the first AC contactor KM1 and the second AC contactor KM2 include main contacts.

[0047] Both generator interface 1 and AC terminal interface 2 include a live wire terminal, a neutral wire terminal, and a protective ground terminal. The protective ground terminal is grounded.

[0048] The first end of the main contact of the first AC contactor KM1 is connected to the live wire terminal and the neutral wire terminal of the generator interface 1, respectively, and the second end of the main contact of the first AC contactor KM1 is connected to the charging output interface 3. The opening and closing of the main contacts controls the on / off state of the first power supply line. When the main contacts of the first AC contactor KM1 are closed, the first power supply line is connected. When the main contacts of the first AC contactor KM1 are open, the first power supply line is disconnected.

[0049] The first end of the main contact of the second AC contactor KM2 is connected to the live wire terminal and the neutral wire terminal of the generator interface 1, respectively. The second end of the main contact of the second AC contactor KM2 is connected to the charging output interface 3. The opening and closing of the main contacts controls the on / off state of the second power supply line. When the main contacts of the second AC contactor KM2 are closed, the second power supply line is connected. When the main contacts of the second AC contactor KM2 are open, the second power supply line is disconnected.

[0050] In this embodiment, as an example, when the generator set outputs three-phase AC power, both generator interface 1 and AC terminal interface 2 include live wire terminals L1, L2, L3, neutral wire terminal N, and protective earth terminal PE. Specifically, the live wire terminals of generator interface 1 are designated 1-L1, 1-L2, and 1-L3, and the neutral wire terminal is designated 1-N. Specifically, the live wire terminals of AC terminal interface 2 are designated 2-L1, 2-L2, and 2-L3, and the neutral wire terminal is designated 2-N.

[0051] In this embodiment, generator interface 1 is equipped with a live wire terminal, a neutral wire terminal, and a protective grounding wire terminal. The main contacts of the first and second AC contactors KM2 are respectively connected to the corresponding terminals. On the one hand, the leakage current is conducted to the ground through the protective grounding wire terminal, effectively preventing electric shock accidents caused by leakage of the generator set or line, and improving the electrical safety of the equipment. On the other hand, the corresponding connection between the main contacts and the terminals ensures a clear current path, avoiding problems such as short circuits and line burnout caused by incorrect wiring, ensuring stable power transmission, and simplifying the subsequent line maintenance process, reducing the difficulty of operation and maintenance.

[0052] In one alternative embodiment, both the first AC contactor KM1 and the second AC contactor KM2 further include a coil. The coil is used to close the main contacts when energized and to open the main contacts when de-energized.

[0053] In this embodiment, the coil of the first AC contactor KM1 closes its main contacts when energized and opens them when de-energized. The coil of the second AC contactor KM2 closes its main contacts when energized and opens them when de-energized.

[0054] In one alternative embodiment, the interlocking structure 4 includes an electrical interlocking assembly. The electrical interlocking assembly includes first auxiliary contacts A1 and A2 disposed on the first AC contactor KM1.

[0055] The first auxiliary contact is connected in series to the power supply line of the coil of the second AC contactor KM2.

[0056] Specifically, after the coil of the first AC contactor KM1 is energized, the first auxiliary contact is disconnected to cut off the power supply line of the coil of the second AC contactor KM2, thus disconnecting the second power supply line.

[0057] In this embodiment, the electrical energy on the power supply line of the coil of the second AC contactor KM2 is the electrical energy in the second power supply line.

[0058] In this embodiment, both the first and second AC contactors KM2 are equipped with coils. By utilizing the coil's characteristic of closing the main contacts when energized and opening them when de-energized, the power supply line can be electrically controlled. No manual switching of the line is required; switching the power supply path can be completed simply by controlling the coil's energization via circuit signals. This adapts to the automated operation requirements of engineering machinery, reducing manual operation steps and the probability of errors. Furthermore, the coil control has a fast response speed, instantly switching the line when power supply demand changes, avoiding power transmission interruptions and ensuring power supply efficiency. Simultaneously, the coil's low power consumption does not additionally increase the equipment's energy burden.

[0059] In one alternative embodiment, the interlocking structure 4 includes an electrical interlocking assembly. The electrical interlocking assembly further includes second auxiliary contacts B1 and B2 disposed on the second AC contactor KM2.

[0060] The second auxiliary contact is connected in series to the power supply line of the coil of the first AC contactor KM1.

[0061] Specifically, after the coil of the second AC contactor KM2 is energized, the second auxiliary contact is disconnected to cut off the power supply line of the coil of the first AC contactor KM1 and disconnect the first power supply line.

[0062] In this embodiment, the electrical energy on the power supply line of the coil of the first AC contactor KM1 is the electrical energy in the first power supply line.

[0063] In this embodiment, the first auxiliary contact of the first AC contactor KM1 is connected in series to the power supply line of the coil of the second AC contactor KM2 to form a one-way electrical interlock: when the coil of the first AC contactor KM1 is energized (generator set replenishment), the first auxiliary contact is simultaneously disconnected, directly cutting off the power supply to the coil of the second AC contactor KM2, forcing its main contact to remain in the open state, and completely eliminating the possibility of mis-connection of the AC charging line.

[0064] In one alternative implementation, the interlock structure 4 further includes a mechanical interlock component.

[0065] The mechanical interlock assembly is located between the iron core of the first AC contactor KM1 and the iron core of the second AC contactor KM2.

[0066] A mechanical interlock assembly is used to prevent the core of the second AC contactor KM2 from engaging after the coil of the first AC contactor KM1 is energized, so as to disconnect the second power supply line.

[0067] After the coil of the second AC contactor KM2 is energized, it restricts the core of the first AC contactor KM1 from engaging, thereby disconnecting the first power supply line.

[0068] In this embodiment, as an example, the mechanical interlock assembly includes: Linkage push rod, locking buckle and fixing bracket.

[0069] The fixed bracket is made of insulated metal (such as galvanized steel plate) and is fixed to the inner wall of the AC parallel line device housing by bolts. It is located at the central axis position between the first AC contactor KM1 and the second AC contactor KM2. A horizontal sliding groove is opened in the middle of the fixed bracket. The length of the sliding groove is adapted to the maximum engagement stroke of the iron core of the two AC contactors, providing a stable sliding track for the linkage push rod, while avoiding interference with other lines in the device (such as main contact wiring and coil control lines).

[0070] The linkage push rod is a cylindrical metal rod with a clearance fit (≤0.5mm) between its outer diameter and the width of the sliding groove of the fixed bracket, allowing it to slide horizontally along the sliding groove. Both ends of the push rod extend to the outside of the iron cores of KM1 and KM2, respectively, and wear-resistant rubber pads are attached to the ends (to prevent metal collision and wear when the iron cores are attracted). The locking buckle is an L-shaped plastic clip, with two sets, which are fixed to both sides of the linkage push rod (near the iron cores of KM1 and KM2) by screws. The protruding end of the locking buckle faces the iron core and corresponds to the position of the preset limiting groove on the side of the iron core.

[0071] Both the KM1 and KM2 cores have rectangular limiting grooves (groove depth ≥ locking buckle protrusion height, width consistent with buckle width) on the side near the linkage push rod, matching the protruding end of the locking buckle. When the core is in the de-energized reset state, the linkage push rod is located in the middle of the sliding groove, and neither set of locking buckles enters the limiting groove of the core. When either core is energized and engaged, the core moves towards the push rod, pushing the push rod to slide along the sliding groove towards the other contactor, thereby causing the locking buckle to embed into the limiting groove of the other contactor.

[0072] Scenario 1: The coil of the first AC contactor KM1 is energized: When the KM1 coil is energized, it generates electromagnetic force, which drives its iron core to be attracted towards the linkage push rod. The rubber pad at the end of the iron core contacts one end of the push rod and pushes the push rod to move towards KM2 along the sliding groove of the fixed bracket. As the push rod slides, the locking buckle on the side closest to KM2 moves synchronously until the protruding end of the buckle is fully embedded in the limiting groove of the KM2 iron core. At this time, the KM2 iron core is mechanically limited by the locking buckle, and even if its coil is energized to generate electromagnetic force, it cannot break through the buckle's obstruction to complete the attraction action. If the KM2 core fails to engage, its main contacts remain open, and the second power supply line remains de-energized, achieving a mechanical interlocking effect of "KM2 being forcibly disconnected when KM1 is on".

[0073] Scenario 2: The coil of the second AC contactor KM2 is energized: After the KM2 coil is energized, its iron core attracts and pushes the linkage push rod to slide towards KM1, and the locking buckle on the side near KM1 is inserted into the limiting groove of the KM1 iron core; The KM1 core is locked by a latch, preventing it from engaging. Its main contacts remain open, and the first power supply line is de-energized, forming a mechanical interlock logic symmetrical to scenario 1.

[0074] When the coil of the energized AC contactor is de-energized (such as when the power supply to the generator set or AC pile is cut off), its iron core returns to its original position under the action of the reset spring. After the linkage push rod loses its thrust, it returns to the middle position under the action of the reset springs on both sides (pre-installed in the sliding groove of the fixed bracket). The locking buckle disengages from the limiting groove of the other contactor, the mechanical interlock is released, and the other contactor can be engaged normally.

[0075] In this embodiment, the mechanical interlock component, through its rigid structure with physical limits, ensures that even if the electrical interlock temporarily fails, it can still prevent both power supply lines from conducting simultaneously, avoiding the risk of electric shock or short circuit caused by vibration. In harsh electromagnetic environments, if there is strong electromagnetic interference at the work site (such as nearby high-voltage equipment or welding equipment), it may interfere with the signal of the coil power supply circuit, leading to abnormal electrical interlock logic; the mechanical interlock component does not rely on circuit signals, but only on mechanical structural linkage, and can maintain a stable interlock function in electromagnetic interference environments, improving the device's anti-interference capability.

[0076] In this embodiment, the mechanical interlock assembly is positioned between the iron core of the first AC contactor KM1 and the iron core of the second AC contactor KM2. It physically restricts the iron core from engaging: when one contactor coil is energized, the engaging iron core pushes the mechanical interlock assembly towards the other contactor, directly locking its iron core and preventing it from engaging, thus physically blocking the other power supply line. This solution is unaffected by electrical signal interference. Even if short circuits or signal disturbances occur, the mechanical structure maintains its interlocked state, forming a dual electrical and mechanical protection system with the electrical interlock. This completely eliminates the possibility of two power supplies operating simultaneously, making it particularly suitable for safety assurance in complex operating environments of engineering machinery.

[0077] In this embodiment, a generator can be added to the front end of the OBC to solve the problem of no charging facilities in remote areas; the generator set is cheaper than the range extender and the engine, which can reduce costs.

[0078] In this embodiment, the coils of the AC contactors are connected to any two sets of live wires (L1, L2, L3), and an interlocking mechanism is positioned between the two AC contactors to achieve mechanical interlocking. The two sets of electrical auxiliary contacts of the interlocking mechanism are connected to the coils of the AC contactors to achieve electrical interlocking. When one set of AC input coils detects a 380V voltage, the main contacts close, and the interlocking mechanism pushes the mechanical interlocking assembly towards the other set of AC contactors to achieve mechanical interlocking. Simultaneously, the portions connected to the coils achieve electrical interlocking, ensuring circuit safety.

[0079] This application also provides an engineering machine, including the AC paralleling device in the above example.

[0080] In this embodiment, the construction machinery can be new energy vehicles, such as common construction machinery: excavators, loaders, bulldozers, road rollers, concrete mixers, cranes, etc.

[0081] In this embodiment, the construction machinery integrates the aforementioned AC parallel charging device, which addresses the limitations of traditional equipment recharging scenarios: in remote areas, it can recharge autonomously using an onboard generator set, and when near charging facilities, it can use external AC charging piles, increasing the equipment's operating range and flexibility. Furthermore, the dual interlocking mechanism eliminates safety hazards during recharging, reducing the probability of equipment circuit failure and the risk of electric shock to personnel. At the same time, compared to traditional engine and range extender recharging, onboard generator sets are more cost-effective.

[0082] In one alternative implementation, the construction machinery further includes a generator set connected to an AC parallel connection device.

[0083] In this embodiment, the AC power output terminal of the generator set is precisely matched and connected to the generator interface of the AC parallel line device.

[0084] In this embodiment, the construction machinery directly integrates a generator set and connects it to an AC parallel connection device, eliminating the need for an external generator set. This reduces equipment handling and connection steps, improving the convenience of power replenishment. The generator set and parallel connection device have stronger compatibility and more stable wiring connections, avoiding power loss or malfunctions caused by interface incompatibility or loose wiring when connecting external equipment. Simultaneously, the integrated design optimizes the internal space layout of the equipment, reduces external wiring exposure, lowers the risk of wiring damage in complex operating environments, and further enhances the overall reliability and ease of maintenance of the equipment.

[0085] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this application.

Claims

1. An AC parallel line device, characterized in that, include: Generator interface; AC charging pile interface; Charging output interface; A first power supply line connecting the generator interface and the charging output interface; A second power supply line connecting the AC charging pile interface and the charging output interface; An interlocking structure that is connected to the first power supply line and the second power supply line respectively; The interlocking structure is used to control one of the first power supply lines or the second power supply line to be turned on, and to control the other power supply line to be turned off.

2. The AC parallel line device according to claim 1, characterized in that, The generator interface is used to connect to the AC power of the generator set; the AC charging pile interface is used to connect to the AC power of an external AC charging pile. The charging output interface is connected to an external electrical device and is used to output AC power from the generator set to the electrical device when the first power supply line is connected, or to output AC power from the AC charging pile to the electrical device when the second power supply line is connected.

3. The AC parallel line device according to claim 1, characterized in that, The first power supply line includes a first AC contactor; the second power supply line includes a second AC contactor. The interlocking structure is disposed between the first AC contactor and the first AC contactor; The interlocking structure is used to control the closing of the first AC contactor or one of the first AC contactors; wherein, when the first AC contactor is closed, the first power supply line is connected. When the second AC contactor is closed, the second power supply line is connected.

4. The AC parallel line device according to claim 3, characterized in that, Both the first AC contactor and the second AC contactor include main contacts; Both the generator interface and the AC charging terminal include a live wire terminal, a neutral wire terminal, and a protective ground wire terminal; the protective ground wire terminal is grounded. The first end of the main contact of the first AC contactor is connected to the live wire terminal and the neutral wire terminal of the generator interface respectively, and the second end of the main contact of the first AC contactor is connected to the charging output interface. The on / off state of the first power supply line is controlled by closing or opening the main contacts; The first end of the main contact of the second AC contactor is connected to the live wire terminal and the neutral wire terminal of the AC terminal block interface, respectively, and the second end of the main contact of the second AC contactor is connected to the charging output interface; the on / off state of the second power supply line is controlled by closing or opening the main contact.

5. The AC parallel line device according to claim 4, characterized in that, Both the first AC contactor and the second AC contactor further include a coil; the coil is used to close the main contacts when energized and to open the main contacts when de-energized.

6. The AC parallel line device according to claim 5, characterized in that, The interlocking structure includes an electrical interlocking component; the electrical interlocking component includes a first auxiliary contact disposed on the first AC contactor; The first auxiliary contact is connected in series to the power supply line of the coil of the second AC contactor; Specifically, after the coil of the first AC contactor is energized, the first auxiliary contact is disconnected to cut off the power supply line to the coil of the second AC contactor and disconnect the second power supply line.

7. The AC parallel line device according to claim 6, characterized in that, The interlocking structure includes an electrical interlocking assembly; the electrical interlocking assembly further includes a second auxiliary contact disposed on the second AC contactor; The second auxiliary contact is connected in series to the power supply line of the coil of the first AC contactor; Specifically, after the coil of the second AC contactor is energized, the second auxiliary contact is disconnected to cut off the power supply line of the coil of the first AC contactor and disconnect the first power supply line.

8. The AC parallel line device according to claim 6, characterized in that, The interlocking structure also includes a mechanical interlocking component; The mechanical interlock assembly is disposed between the iron core of the first AC contactor and the iron core of the second AC contactor; The mechanical interlock assembly is used to restrict the core of the second AC contactor from engaging after the coil of the first AC contactor is energized, so as to disconnect the second power supply line. After the coil of the second AC contactor is energized, it restricts the iron core of the first AC contactor from engaging, thereby disconnecting the first power supply line.

9. An engineering machinery, characterized in that, include: The AC parallel-line device according to any one of claims 1 to 8.

10. The engineering machinery according to claim 9, characterized in that, The engineering machinery also includes a generator set, which is connected to the AC parallel connection device.

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