Vehicle-mounted high-voltage cabinet and operation machine

Abstract

The utility model relates to the technical field of equipment electric control, in particular to a vehicle-mounted high-voltage cabinet and operation machinery, a high-voltage inlet cable is connected into a cabinet body and then is sequentially connected with a lightning arrester and a voltage transformer, a vacuum circuit breaker, a current transformer and a starting contactor, and the inlet wire side of the vacuum circuit breaker is connected with the voltage transformer; a zero sequence current transformer is arranged between the current transformer and the starting contactor; the inlet wire side of the reactor is connected with a starting contactor, the reactor is connected in parallel with a running contactor, and the outlet wire side of the reactor is connected with an equipment motor The high-voltage side of the auxiliary transformer is connected with the voltage transformer, and the low-voltage side is connected with the low-voltage unit. According to the utility model, the vacuum circuit breaker is used as a main switch, and the zero-sequence current transformer has a zero-sequence protection function, can detect abnormal conditions such as fault current, overload, short circuit and the like and send out an alarm signal, so that a connecting circuit has the functions of short circuit, overload, leakage protection and the like, and a line and a power supply can be well protected.

Description

Technical Field

[0001] The utility model relates to the technical field of equipment electric control, in particular to a vehicle-mounted high-voltage cabinet and a working machine. Background Art

[0002] An excavator is a heavy mechanical equipment. At present, excavators are widely used in various engineering and infrastructure projects. In recent years, with the improvement of power sources and the trend of green environmental protection, electric hydraulic excavators driven by electric motors have gradually become a research hotspot. Among them, the high-voltage switchgear, as the core of the control and protection of the electrical system, especially needs to ensure reliability and safety.

[0003] A traditional high-voltage switchgear refers to an electrical device that plays roles such as switching on and off, controlling or protecting in the power generation, transmission, distribution, power conversion and consumption of the power system, and is mostly installed in a fixed manner. In the prior art, the high-voltage switchgear of an electric excavator is usually modified from a traditional high-voltage switchgear. At present, the high-voltage cabinets for large excavators in mines basically use disconnect switches as the main switches to control the circuit. The 6 / 10 kV power cable in the mine is connected to the switch incoming line side. After passing through the disconnect switch in the high-voltage cabinet, the power is branched into two paths. One path directly goes to the auxiliary transformer to supply power to each auxiliary mechanism; the other path passes through the high-voltage disconnect switch and the high-voltage vacuum contactor and then leads to the main transformer, and then is connected to the excavator motor to complete the high-voltage power supply.

[0004] For the existing high-voltage switchgear of an excavator, with the disconnect switch as the main switch, in its circuit, when current faults and abnormal conditions such as overload and short circuit occur, it cannot effectively respond, and it is easy to cause damage to the circuit and components when abnormal conditions occur, affecting the normal operation of the equipment. Summary of the Utility Model

[0005] The utility model provides a vehicle-mounted high-voltage cabinet and a working machine to solve the defect that the circuit and components of the existing high-voltage switchgear of an excavator are easily damaged when current faults and abnormal conditions such as overload and short circuit occur, affecting the normal operation of the equipment.

[0006] The utility model provides a vehicle-mounted high-voltage cabinet, which comprises a cabinet body. An incoming line unit, a connection unit, a low-voltage unit and an auxiliary transformer unit are arranged in the cabinet body. The incoming line unit comprises a lightning arrester and a voltage transformer which are electrically connected. After a high-voltage incoming line cable accesses the cabinet body, it is connected to the incoming line side of the lightning arrester. The connection unit comprises a vacuum circuit breaker, a current transformer and a starting contactor which are electrically connected in sequence. The incoming line side of the vacuum circuit breaker is connected to the voltage transformer. A zero-sequence current transformer is arranged on the circuit between the current transformer and the starting contactor. The low-voltage unit comprises a switching power supply and an auxiliary mechanism. The auxiliary transformer unit comprises a reactor and an auxiliary transformer. The incoming line side of the reactor is connected to the starting contactor. The reactor is connected in parallel with an operating contactor. The outgoing line side of the reactor is connected to a main transformer and then accesses an equipment motor. The high-voltage side of the auxiliary transformer is connected to the voltage transformer through a protection fuse. The low-voltage side of the auxiliary transformer is connected to the low-voltage unit.

[0007] According to the vehicle-mounted high-voltage cabinet provided by the utility model, the auxiliary mechanism of the low-voltage unit comprises a PLC control device. The PLC control device is electrically connected to the voltage transformer, the vacuum circuit breaker, the current transformer and the zero-sequence current transformer respectively. The PLC control device receives the induction signals of the voltage transformer, the current transformer and the zero-sequence current transformer to control the on-off of the vacuum circuit breaker.

[0008] According to the vehicle-mounted high-voltage cabinet provided by the utility model, voltage relays are connected in parallel to the low-voltage sides of the main transformer and the auxiliary transformer. The voltage relays are connected to the PLC control device. The voltage relays are used for monitoring the voltage conditions of the main transformer and the auxiliary transformer and feeding them back to the PLC control device.

[0009] According to the vehicle-mounted high-voltage cabinet provided by the utility model, the PLC control device comprises a PLC controller and a tripping relay. The PLC controller is connected to the tripping relay. The tripping relay is connected to the vacuum circuit breaker through a tripping circuit.

[0010] According to the vehicle-mounted high-voltage cabinet provided by the utility model, the PLC control device is further connected to a display screen, and the display screen is used for displaying fault information.

[0011] According to the vehicle-mounted high-voltage cabinet provided by the utility model, the cabinet body comprises a high-voltage chamber, an auxiliary transformer chamber and a low-voltage chamber. The incoming line unit and the connection unit are arranged in the high-voltage chamber. The auxiliary transformer unit is arranged in the auxiliary transformer chamber. The low-voltage unit is arranged in the low-voltage chamber. The high-voltage chamber and the auxiliary transformer chamber are combined to form a two-chamber cabinet. The low-voltage chamber forms a single-chamber cabinet. The two-chamber cabinet and the single-chamber cabinet are fixed at different positions of the equipment and are electrically connected through cables.

[0012] According to a vehicle-mounted high-voltage cabinet provided by the present utility model, the two-chamber cabinet is provided with a high-voltage cable inlet and a low-voltage cable outlet, the single-chamber cabinet is provided with a low-voltage cable inlet, and quick-connect joints are provided at both the low-voltage cable outlet and the low-voltage cable inlet.

[0013] According to a vehicle-mounted high-voltage cabinet provided by the present utility model, the two-chamber cabinet includes a two-chamber cabinet body and a cabinet door. A door panel armrest and an electromagnetic lock are provided on the cabinet door of the two-chamber cabinet. A mechanical lock is further provided at the edge of the cabinet door of the two-chamber cabinet. Among them, a heat dissipation port is provided on the cabinet door corresponding to the auxiliary transformer chamber, and an auxiliary transformer chamber inspection door communicating with the auxiliary transformer chamber is further formed on one side of the two-chamber cabinet body; lifting lugs and a pressurizing fan are provided on the top of the two-chamber cabinet body. The lifting lugs are used for hoisting the two-chamber cabinet, the pressurizing fan is used for blowing air into the two-chamber cabinet, and shock absorbers are provided on the back side, bottom and inside of the two-chamber cabinet body;

[0014] The single-chamber cabinet includes a single-chamber cabinet body and a cabinet door. A door lock is provided on the cabinet door of the single-chamber cabinet, heat dissipation air outlets are provided on both the cabinet door and the side part of the single-chamber cabinet body, and shock-absorbing devices are provided at the bottom and inside of the single-chamber cabinet.

[0015] According to a vehicle-mounted high-voltage cabinet provided by the present utility model, a first heater for heating the indoor environment of the high-voltage chamber, a first lighting component for providing indoor lighting in the high-voltage chamber, and a first sensor for providing an electrified signal are further provided in the high-voltage chamber; a second heater for heating the indoor environment of the auxiliary transformer chamber, a second lighting component for providing indoor lighting in the auxiliary transformer chamber, a second sensor for providing an electrified signal, and a heat dissipation fan for dissipating heat and ventilating the indoor environment of the auxiliary transformer chamber are further provided in the auxiliary transformer chamber; the auxiliary mechanism of the low-voltage unit further includes a third heater for heating the indoor environment of the low-voltage chamber and an intelligent meter for displaying voltage and current information.

[0016] On the other hand, the present utility model further provides a working machine including any one of the above vehicle-mounted high-voltage cabinets.

[0017] The vehicle-mounted high-voltage cabinet and the working machine provided by the present utility model use a vacuum circuit breaker as the main switch. After the high-voltage incoming cable is connected into the cabinet body, it is connected to a lightning arrester through a copper bar. The lightning arrester is connected to a voltage transformer, and a voltage transformer fuse is provided on the voltage transformer. The outgoing side of the voltage transformer is divided into two paths. One path is connected to the high-voltage side of the auxiliary transformer, and the other path is sequentially connected to the vacuum circuit breaker, the current transformer, and the starting contactor. Finally, it is connected to the equipment motor through a reactor and a main transformer to supply power to the motor. The outgoing side of the current transformer is connected to a wire, which passes through the zero-sequence current transformer and is then connected to the incoming terminal of the starting contactor. The zero-sequence current transformer has a zero-sequence protection function, can detect fault currents and abnormal conditions such as overload and short circuit, and issue an alarm signal, so that the connected circuit has functions such as short-circuit, overload, and leakage protection, and can well protect the circuit and the power supply. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic diagram of the working principle of the vehicle-mounted high-voltage cabinet provided by the present utility model.

[0020] Figure 2 It is a schematic diagram of the principle of zero-sequence protection by the zero-sequence current transformer provided by the present utility model.

[0021] Figure 3 It is a schematic diagram of the principle of ground monitoring protection by the voltage relay provided by the present utility model.

[0022] Figure 4 It is a schematic diagram of the external structure of the two-compartment cabinet of the vehicle-mounted high-voltage cabinet provided by the present utility model.

[0023] Figure 5 It is a schematic diagram of the internal structure of the two-compartment cabinet of the vehicle-mounted high-voltage cabinet provided by the present utility model.

[0024] Figure 6 It is a schematic diagram of the external structure of the single-compartment cabinet of the vehicle-mounted high-voltage cabinet provided by the present utility model.

[0025] Figure 7 It is a schematic diagram of the internal structure of the single-compartment cabinet of the vehicle-mounted high-voltage cabinet provided by the present utility model.

[0026] Figure 8 It is a schematic diagram of the top of the two-compartment cabinet of the vehicle-mounted high-voltage cabinet provided by the present utility model.

[0027] Figure 9 It is a side view of a two - chamber cabinet of a vehicle - mounted high - voltage cabinet provided by the present utility model.

[0028] Figure 10 It is a rear view of a two - chamber cabinet of a vehicle - mounted high - voltage cabinet provided by the present utility model.

[0029] Figure 11 It is a bottom view of a two - chamber cabinet of a vehicle - mounted high - voltage cabinet provided by the present utility model.

[0030] Figure 12 It is a side view of a single - chamber cabinet of a vehicle - mounted high - voltage cabinet provided by the present utility model.

[0031] Figure 13 It is a bottom view of a single - chamber cabinet of a vehicle - mounted high - voltage cabinet provided by the present utility model.

[0032] Reference numerals: 1, lightning arrester; 2, voltage transformer; 3, vacuum circuit breaker; 4, current transformer; 5, starting contactor; 6, zero - sequence current transformer; 7, switching power supply; 8, reactor; 9, auxiliary transformer; 10, running contactor; 11, voltage relay; 12, high - voltage chamber; 13, auxiliary - transformer chamber; 14, low - voltage chamber; 15, high - voltage cable inlet; 16, low - voltage cable outlet; 17, low - voltage cable inlet; 18, door - panel armrest; 19, electromagnetic lock; 20, mechanical lock; 21, heat dissipation port; 22, auxiliary - transformer chamber maintenance door; 23, lifting lug; 24, booster fan; 25, shock absorber; 26, door lock; 27, heat - dissipation air outlet; 28, first heater; 29, first lighting component; 30, first sensor; 31, second heater; 32, second lighting component; 33, second sensor; 34, heat - dissipation fan; 35, third heater; 36, intelligent instrument. Detailed implementation manners

[0033] To make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions in the present utility model will be clearly and completely described below with reference to the accompanying drawings in the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the protection scope of the present utility model.

[0034] In the description of the embodiments of the present utility model, it should be noted that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the embodiments of the present utility model and for simplification, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of the present utility model.

[0035] In the description of the embodiments of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0036] In the embodiments of the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0037] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present utility model. In this specification, the schematic descriptions 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 a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0038] The following is combined with Figures 1 to 13Describe the structure and working principle of the on-vehicle high-voltage cabinet and the working machinery of the present utility model. It should be noted that the on-vehicle high-voltage cabinet of the present utility model can be mainly used for installation on heavy machinery equipment. Of course, it can also be used as a conventional high-voltage switch cabinet. The following specifically takes the on-vehicle high-voltage cabinet for an excavator as an example for description.

[0039] An embodiment of the present utility model provides an on-vehicle high-voltage cabinet for an excavator, including a cabinet body. An incoming line unit, a connection unit, a low-voltage unit, and an auxiliary transformer unit are arranged in the cabinet body. Refer to Figure 1 As shown, the incoming line unit includes a lightning arrester 1 and a voltage transformer 2 which are electrically connected. After the high-voltage incoming line cable is connected to the inside of the cabinet body, it is connected to the incoming line side of the lightning arrester 1; the connection unit includes a vacuum circuit breaker 3, a current transformer 4, and a starting contactor 5 which are electrically connected in sequence. The incoming line side of the vacuum circuit breaker 3 is connected to the voltage transformer 2, and a zero-sequence current transformer 6 is arranged on the circuit between the current transformer 4 and the starting contactor 5; the low-voltage unit includes a switching power supply 7 and an auxiliary mechanism; the auxiliary transformer unit includes a reactor 8 and an auxiliary transformer 9. The incoming line side of the reactor 8 is connected to the starting contactor 5, the reactor 8 is connected in parallel with an operating contactor 10, and the outgoing line side of the reactor 8 is connected to the main transformer and then accesses the excavator motor; the high-voltage side of the auxiliary transformer 9 is connected to the voltage transformer 2 through a protection fuse, and the low-voltage side of the auxiliary transformer 9 is connected to the low-voltage unit.

[0040] It can be understood that for the on-vehicle high-voltage cabinet of this embodiment, with the vacuum circuit breaker 3 as the main switch, after the high-voltage incoming line cable is connected to the inside of the cabinet body, it is connected to the lightning arrester 1 through a copper bar. The lightning arrester 1 is connected to the voltage transformer 2. The voltage transformer 2 is provided with a voltage transformer fuse. The outgoing line side of the voltage transformer 2 is divided into two paths. One path is connected to the high-voltage side of the auxiliary transformer 9, and the other path is connected to the vacuum circuit breaker 3, the current transformer 4, and the starting contactor 5 in sequence, and finally accesses the excavator motor through the reactor 8 and the main transformer to supply power to the motor. It should be understood that in this embodiment, the outgoing line side of the current transformer 4 is connected to a wire that passes through the zero-sequence current transformer 6 and then is connected to the incoming line terminal of the starting contactor 5 (main contactor). The outgoing line terminal of the starting contactor 5 is connected in parallel with the operating contactor 10 and the incoming line side of the reactor 8 through a wire. The outgoing line sides of the operating contactor 10 and the reactor 8 are connected in parallel. Among them, the zero-sequence current transformer 6 has a zero-sequence protection function, can detect fault currents and abnormal conditions such as overload and short circuit and issue an alarm signal, so that the connected circuit has functions such as short-circuit, overload, and leakage protection, and can well protect the line and the power supply.

[0041] In some embodiments of the on-vehicle high-voltage cabinet for an excavator of the present utility model, the auxiliary mechanism of the low-voltage unit includes a PLC control device. The PLC control device is electrically connected to a voltage transformer 2, a vacuum circuit breaker 3, a current transformer 4, and a zero-sequence current transformer 6 respectively. The PLC control device receives the induction signals of the voltage transformer 2, the current transformer 4, and the zero-sequence current transformer 6 to control the on-off of the vacuum circuit breaker 3. It can be understood that, referring to Figure 2 as shown, the PLC control device collects the operating conditions of the voltage and current in the circuit monitored by components such as the voltage transformer 2, the current transformer 4, and the zero-sequence current transformer 6. After analysis and sorting by the PLC control device, corresponding processing signals will be output. When an abnormal situation occurs, the PLC control device controls the vacuum circuit breaker 3 to cut off, protecting the safety of electrical equipment.

[0042] In some other embodiments of the on-vehicle high-voltage cabinet for an excavator of the present utility model, voltage relays 11 are connected in parallel to the low-voltage sides of the main transformer and the auxiliary transformer 9. The voltage relays 11 are connected to the PLC control device. The voltage relays 11 are used to monitor the voltage conditions of the main transformer and the auxiliary transformer 9 and feedback to the PLC control device. It can be understood that in addition to the primary side of the main transformer and the auxiliary transformer 9 being equipped with protection fuses to prevent over-current situations, a voltage relay 11 is added on this basis. Referring to Figure 3 as shown, the voltage relays 11 monitor the voltage conditions of the transformers and transmit the monitoring signals to the PLC control device. When the voltage is abnormal, the power supply is controlled to be cut off through the PLC control device, controlling the operating state and output voltage of the transformers, improving the utilization rate, and protecting the safety of electrical equipment.

[0043] Based on the above several embodiments, the PLC control device of the on-vehicle high-voltage cabinet for an excavator in this embodiment includes a PLC controller and a tripping relay. The PLC controller is connected to the tripping relay. The tripping relay is connected to the vacuum circuit breaker 3 through a tripping circuit. The PLC control device is also connected to a display screen, and the display screen is used to display fault information.

[0044] Combined with Figure 2 and Figure 3As shown, it can be understood that the PLC control device is configured to collect electrical signals and output corresponding instructions to control the operation of electrical components, ensuring the safety of the circuit. Electrical interlocking is achieved through devices such as PLC controllers and shunt trip relays inside the high-voltage cabinet. Inside the high-voltage cabinet, corresponding signals are collected through voltage transformers 2, current transformers 4, zero-sequence current transformers 6, and voltage relays 11, and these signals are transmitted to the PLC controller. The shunt trip relay coil is connected to the CPU module of the PLC controller, and the shunt trip relay contact is connected to the breaker shunt trip circuit. The breaker shunt trip circuit is used to control the closing or opening of the contacts of the vacuum circuit breaker 3. When signals such as current and voltage are normal, the PLC controller outputs no abnormal signals. At this time, the shunt trip relay coil does not operate, and the shunt trip relay contact does not operate. The breaker shunt trip circuit enables the vacuum circuit breaker 3 to operate normally. When signals such as current and voltage are abnormal, the PLC controller controls the shunt trip relay coil to attract. At this time, the shunt trip relay contact closes, and through the breaker shunt trip circuit, the contacts of the vacuum circuit breaker 3 are closed, and the vacuum circuit breaker 3 trips and cuts off the power to protect the safety of the circuit.

[0045] It should be understood that the relevant parameter signals of components such as the excavator motor and contactor can also be input into the PLC control device. When the motor parameters are abnormal, the PLC control device controls the start-stop circuit of the motor through the corresponding motor relay in the CPU module to ensure the safety of the motor and the circuit.

[0046] When signals such as current and voltage are abnormal, the PLC control device will also transmit the abnormal signals to the display screen through CAN signals. The display screen will feedback the corresponding fault signals on the display screen to inform the operator of the fault situation.

[0047] In some embodiments of the on-vehicle high-voltage cabinet of the excavator of the present utility model, the vacuum circuit breaker 3 is provided with a vacuum interrupter chamber. It can be understood that taking the vacuum circuit breaker 3 as the main switch, the vacuum circuit breaker 3 with a vacuum interrupter chamber has an arc extinguishing function, can cut off load current, short-circuit current, etc., prevent closing operation with load, and the vacuum circuit breaker 3 has a high breaking capacity and a protection function, with convenient operation and high safety.

[0048] The on-vehicle high-voltage cabinet of the excavator of the present utility model can be made into an integrated type or a split type, with a wide range of applications. In some specific examples of the on-vehicle high-voltage cabinet of the excavator of the present utility model, in combination with Figure 5 and Figure 7 As shown, the cabinet body includes a high-voltage chamber 12, an auxiliary transformer chamber 13, and a low-voltage chamber 14. The incoming line unit and the connection unit are arranged in the high-voltage chamber 12, the auxiliary transformer unit is arranged in the auxiliary transformer chamber 13, and the low-voltage unit is arranged in the low-voltage chamber 14. The high-voltage chamber 12 and the auxiliary transformer chamber 13 are combined to form a two-chamber cabinet, and the low-voltage chamber 14 forms a single-chamber cabinet. The two-chamber cabinet and the single-chamber cabinet are fixed at different positions of the excavator and are electrically connected through cables.

[0049] It should be understood that for the on-vehicle high-voltage cabinet of the excavator in this example, the high-voltage part and the low-voltage part of the high-voltage cabinet are separately arranged and installed in the corresponding cabinets. The high-voltage part is arranged in a two-chamber cabinet, and the low-voltage part is arranged in a single-chamber cabinet. Then, a suitable position on the excavator is found for separate installation, and after the installation is completed, electrical connection is carried out through cables. For some excavators, due to the influence of structure and tonnage, when it is impossible to install an integrated high-voltage cabinet, the split-type high-voltage cabinet installation structure of this embodiment can be better applied to the installation and use of the high-voltage cabinet, and the space occupation ratio can be minimized as much as possible while meeting the electrical safety distance, which is more convenient for installation on various ultra-large excavator and tow motor models.

[0050] In some embodiments of the on-vehicle high-voltage cabinet of the utility model for excavators, the two-chamber cabinet is provided with a high-voltage cable inlet 15 and a low-voltage cable outlet 16 (as Figure 11 shown), the single-chamber cabinet is provided with a low-voltage cable inlet 17 (as Figure 13 shown), and both the low-voltage cable outlet 16 and the low-voltage cable inlet 17 are provided with quick-connect joints to form a connection through a quick-connect cable. Among them, the high-voltage cable inlet 15 is used for the high-voltage incoming cable to pass through to connect the external high voltage into the high-voltage cabinet, and the low-voltage cable outlet 16 and the low-voltage cable inlet 17 are used for the high-voltage part of the high-voltage cabinet to supply power and signals to the low-voltage part. The high-voltage side of the auxiliary transformer 9 in the auxiliary transformer chamber 13 and the signal transmission of each component are connected to the quick-connect joint of the low-voltage cable outlet 16 through wires, and the low-voltage cable inlet 17 is also provided with a quick-connect joint, which is connected to the power supply and signal provided by the high-voltage part through a quick-connect cable.

[0051] In some specific examples, the two-chamber cabinet includes a two-chamber cabinet body and a cabinet door. The cabinet door of the two-chamber cabinet is provided with a door panel armrest 18 and an electromagnetic lock 19 (as Figure 4 shown). The door panel armrest 18 can be used as a support when repairing and opening the door and passing by, and the electromagnetic lock 19 locks the door when there is electricity to provide safety protection. A mechanical lock 20 is also provided on the edge of the cabinet door of the two-chamber cabinet to further improve safety.

[0052] Referring again to Figure 4 shown, the cabinet door corresponding to the auxiliary transformer chamber 13 is provided with a heat dissipation port 21 with a filter, which can dissipate heat when the temperature in the high-voltage cabinet is too high and prevent dust and smoke from entering and leaving. A plurality of lifting lugs 23 are symmetrically arranged on the top of the two-chamber cabinet body. When installing the high-voltage cabinet, the high-voltage cabinet can be lifted onto the excavator for installation through the lifting lugs 23. A pressurizing fan 24 with a filter is also provided on the top of the cabinet of the two-chamber cabinet body (as Figure 8 shown). The pressurizing fan 24 is used to strengthen the air blowing effect into the two-chamber cabinet to improve the durability of the cabinet body. An auxiliary transformer chamber inspection door 22 communicating with the auxiliary transformer chamber 13 is also formed on one side of the two-chamber cabinet body (as Figure 9as shown in the figure), which is convenient for detecting and repairing components such as transformers; shock absorbers 25 are provided on the back side, bottom and inside of the two-room cabinet body (such as Figure 10 as shown in the figure). A horizontal shock absorber and a corresponding bracket are installed on the back side of the cabinet body, and together with the shock absorber at the bottom of the high-voltage cabinet and the internal shock absorption device, they provide shock absorption functions, enabling the high-voltage cabinet to work properly on the excavator. The single-room cabinet includes a single-room cabinet body and a cabinet door. Refer to Figure 6 as shown in the figure. A door lock 26 is provided on the cabinet door of the single-room cabinet, and heat dissipation air vents 27 are provided on both the cabinet door and the side of the single-room cabinet body (such as Figure 6 and Figure 12 as shown in the figure). Shock absorption devices are also equipped at the bottom and inside of the single-room cabinet to enable the single-room cabinet to be used normally on the excavator.

[0053] In some other specific embodiments of the vehicle-mounted high-voltage cabinet for excavators of the present invention, referring again to Figure 5 as shown in the figure, a first heater 28 for heating the indoor environment of the high-voltage chamber 12, a first lighting assembly 29 for providing indoor lighting in the high-voltage chamber, and a first sensor 30 for providing live signals are further provided in the high-voltage chamber 12; a second heater 31 for heating the indoor environment of the auxiliary transformer chamber 13, a second lighting assembly 32 for providing indoor lighting in the auxiliary transformer chamber, a second sensor 33 for providing live signals, and a heat dissipation fan 34 for heat dissipation and ventilation in the auxiliary transformer chamber are further provided in the auxiliary transformer chamber 13; the auxiliary mechanism of the low-voltage unit further includes a third heater 35 for heating the indoor environment of the low-voltage chamber and an intelligent meter 36 for displaying voltage and current information. The intelligent meter 36 can receive voltage and current signals from the high-voltage part and transmit them to the PLC controller to achieve circuit cutting-off when signals are abnormal and early warning display of abnormal signals on the display screen. In some specific examples, referring to Figure 7 as shown in the figure, a switching power supply 7 is installed in the low-voltage chamber 14 cabinet and fixed with a bracket; the first row on the front and the left part of the fourth row on the left are miniature circuit breakers, the left side of the second row and the third row are shunt relays of the PLC control device, and the right side of the second row is the PLC controller of the PLC control device; the first row on the left side of the cabinet body is the heat dissipation fan 34, the left side of the second row is a molded case circuit breaker, the right side is a voltage relay 11, the third row is a wire splitter, and the right side of the fourth row is a contactor; the first row on the right side of the cabinet body is the intelligent meter 36, and the second row is a terminal block; the third heater 35 is installed at the bottom of the cabinet body.

[0054] It can be understood that in some areas, the humidity is high, the climate temperature changes greatly, the bottom of the high-voltage cabinet is damp, and there is even water accumulation in some cable trenches. When there is a temperature difference between the small environment temperature inside the high-voltage cabinet and the surrounding environment temperature, condensation is extremely likely to form on its surface. In this case, once the power is supplied and put into operation, accidents will follow. The first heater 28, the second heater 31, and the third heater 35 in the high-voltage cabinet of this embodiment are mainly used to prevent internal components from experiencing condensation-induced creepage and flashover accidents. By heating and evaporating with the heaters, the small environment inside the high-voltage cabinet is always kept dry. The first sensor 30 and the second sensor 33 in the high-voltage cabinet can provide an electrical signal to the control display. When there is high voltage, the indicator light on the control display will light up, and when the high voltage is disconnected, the indicator light will go out. At the same time, the first sensor 30 and the second sensor 33 can also be used in conjunction with the electromagnetic lock 19. When there is high voltage, the control display can give a relay signal to the electromagnetic lock 19 to achieve the function that the high-voltage cabinet door cannot be opened when there is high voltage at the high-voltage end.

[0055] Another embodiment of the present utility model further provides a working machine, including the on-vehicle high-voltage cabinet in any one of the above embodiments. It can be understood that the working machine in this embodiment can be a working machine such as an excavator, a loader, or a crane. Due to the structure and functions of the above on-vehicle high-voltage cabinet, the working machine provided in this embodiment also has the corresponding functions of the above on-vehicle high-voltage cabinet.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A vehicle-mounted high-voltage cabinet, comprising a cabinet body, characterized in that, The cabinet is provided with the following components: An incoming line unit, which includes a lightning arrester (1) and a voltage transformer (2) that are electrically connected. After the high-voltage incoming line cable enters the cabinet, it is connected to the incoming line side of the lightning arrester (1). A connection unit, which includes a vacuum circuit breaker (3), a current transformer (4), and a starting contactor (5) that are electrically connected in sequence. The incoming line side of the vacuum circuit breaker (3) is connected to the voltage transformer (2), and a zero-sequence current transformer (6) is arranged on the circuit between the current transformer (4) and the starting contactor (5). A low-voltage unit, which includes a switching power supply (7) and an auxiliary mechanism. An auxiliary transformer unit, which includes a reactor (8) and an auxiliary transformer (9). The incoming line side of the reactor (8) is connected to the starting contactor (5). The reactor (8) is connected in parallel with an operating contactor (10). The outgoing line side of the reactor (8) is connected to the main transformer and then accesses the equipment motor. The high-voltage side of the auxiliary transformer (9) is connected to the voltage transformer (2) through a protection fuse, and the low-voltage side of the auxiliary transformer (9) is connected to the low-voltage unit.

2. The on-vehicle high-voltage cabinet according to claim 1, wherein The auxiliary mechanism of the low-voltage unit includes a PLC control device, which is electrically connected to the voltage transformer (2), the vacuum circuit breaker (3), the current transformer (4), and the zero-sequence current transformer (6) respectively. The PLC control device receives the induction signals of the voltage transformer (2), the current transformer (4), and the zero-sequence current transformer (6) to control the on-off of the vacuum circuit breaker (3).

3. The on-vehicle high-voltage cabinet according to claim 2, wherein, Voltage relays (11) are connected in parallel on the low-voltage sides of the main transformer and the auxiliary transformer (9). The voltage relays (11) are connected to the PLC control device, and the voltage relays (11) are used to monitor the voltage conditions of the main transformer and the auxiliary transformer (9) and feedback them to the PLC control device.

4. The on-vehicle high-voltage switch cabinet according to claim 3, characterized in that, The PLC control device includes a PLC controller and a trip relay. The PLC controller is connected to the trip relay, and the trip relay is connected to the vacuum circuit breaker (3) through a trip circuit.

5. The on-vehicle high-voltage cabinet according to any one of claims 2 to 4, characterized in that The PLC control device is also connected to a display screen, which is used to display fault information.

6. The on-vehicle high-voltage switch cabinet according to any one of claims 1 to 4, characterized in that, The cabinet includes a high-voltage chamber (12), an auxiliary transformer chamber (13), and a low-voltage chamber (14). The incoming line unit and the connection unit are arranged in the high-voltage chamber (12), the auxiliary transformer unit is arranged in the auxiliary transformer chamber (13), and the low-voltage unit is arranged in the low-voltage chamber (14). The high-voltage chamber (12) and the auxiliary transformer chamber (13) are combined to form a two-chamber cabinet, and the low-voltage chamber (14) forms a single-chamber cabinet. The two-chamber cabinet and the single-chamber cabinet are fixed at different positions of the equipment and are electrically connected through cables.

7. The on-vehicle high-voltage switch cabinet according to claim 6, characterized in that The two-chamber cabinet is provided with a high-voltage cable inlet (15) and a low-voltage cable outlet (16). The single-chamber cabinet is provided with a low-voltage cable inlet (17). Quick connectors are arranged at both the low-voltage cable outlet (16) and the low-voltage cable inlet (17).

8. The on-vehicle high-voltage cabinet according to claim 6, wherein The two - compartment cabinet includes a two - compartment cabinet body and a cabinet door. A door panel armrest (18) and an electromagnetic lock (19) are provided on the cabinet door of the two - compartment cabinet. A mechanical lock (20) is also provided on the edge of the cabinet door of the two - compartment cabinet. Among them, a heat dissipation opening (21) is provided on the cabinet door corresponding to the auxiliary transformer chamber (13). An auxiliary transformer chamber maintenance door (22) communicating with the auxiliary transformer chamber (13) is also formed on one side of the two - compartment cabinet body; A lifting lug (23) and a pressurizing fan (24) are provided on the top of the two - compartment cabinet body. The lifting lug (23) is used for the hoisting of the two - compartment cabinet, and the pressurizing fan (24) is used for blowing air into the two - compartment cabinet. Shock absorbers (25) are provided on the back side, bottom and inside of the two - compartment cabinet body; The single - compartment cabinet includes a single - compartment cabinet body and a cabinet door. A door lock (26) is provided on the cabinet door of the single - compartment cabinet. Heat dissipation air vents (27) are provided on both the cabinet door and the side of the single - compartment cabinet body. Shock absorption devices are provided at the bottom and inside of the single - compartment cabinet.

9. The on-vehicle high-voltage cabinet according to claim 6, characterized in that, A first heater (28) for heating the indoor environment of the high - voltage chamber, a first lighting component (29) for providing indoor lighting in the high - voltage chamber, and a first sensor (30) for providing an electrified signal are also provided in the high - voltage chamber (12); A second heater (31) for heating the indoor environment of the auxiliary transformer chamber, a second lighting component (32) for providing indoor lighting in the auxiliary transformer chamber, a second sensor (33) for providing an electrified signal, and a heat dissipation fan (34) for heat dissipation and ventilation in the auxiliary transformer chamber are also provided in the auxiliary transformer chamber (13); The auxiliary mechanism of the low - voltage unit also includes a third heater (35) for heating the indoor environment of the low - voltage chamber and an intelligent meter (36) for displaying voltage and current information.

10. An earthmoving machine, characterized in that, The on - vehicle high - voltage cabinet according to any one of claims 1 to 9.

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