Dual-motor input power system and engineering vehicle

Abstract

The utility model relates to the technical field of rock drilling rigs, in particular to a dual-motor input power system and an engineering vehicle, which comprise a dual-input multi-output transmission case provided with two input ends and a plurality of output ends, and the two input ends are respectively in transmission connection with a first motor and a second motor; power of one part of the output end is provided by the first motor, and power of the other part of the output end is provided by the second motor; when the double-input multi-output transmission case is in a first working condition, one of the first motor and the second motor is in a starting state, and the other is in a closing state; and under the second working condition, the first motor and the second motor are both in a starting state. According to the utility model, the working states of the two motors can be controlled under different working conditions, so that the purposes that the two motors work together under a high-load state and the single motor works under a low-load state are achieved, the rated power of the single motor is reduced, and energy waste caused by the fact that only the high-power single motor can be used under the low-load state is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of rock drilling rigs, and in particular to a power system with dual motor inputs and an engineering vehicle. Background Art

[0002] Existing engineering vehicles are mainly powered by diesel engines. However, the emission requirements in mining areas are getting higher and higher, and the difficulty and cost of diesel engine upgrades and subsequent use and maintenance are increasing. Diesel engine systems are gradually being replaced by electric motor systems.

[0003] For example, a Chinese utility model patent with publication number CN218439212U discloses an electric horizontal directional drilling rig with multiple power supply access modes, including a chassis, a drill frame, an auxiliary device, a mud pump device, a feed device, a rotary device and a power supply device; the auxiliary device includes a drilling rig travel unit, a drill rod clamping unit and a variable amplitude unit; the power supply device includes a generator set and an electric control box; the electric control box is electrically connected to the electrical components of the feed motor, the rotary motor, the mud pump device and the electrical components of the auxiliary device.

[0004] However, for the single-motor power system that appears in the prior art, it directly replaces the existing diesel engine with a motor. Since the voltage in the mining area is mostly 1000V or even higher, the size of the high-power high-voltage motor is large and long, and the layout of the power system on the whole machine is very difficult. In addition, the cable connected to the single motor has a large diameter, and the thicker cable is inconvenient to reel in and release. In addition, since the power system needs to face different working conditions, the energy consumption is different under different working conditions. For example, a high-power motor is required for drilling operations. A power system equipped with a single high-power motor will cause energy waste when facing certain working conditions that only require a low-power motor. Utility Model Content

[0005] In order to solve the above problems, the purpose of the utility model is to provide a power system with dual motor input and an engineering vehicle.

[0006] The technical solution provided by the utility model is:

[0007] In a first aspect, a dual-motor input power system includes a dual-input multi-output transmission box, which is provided with two input ends and multiple output ends; the two input ends are respectively connected to a first motor and a second motor in a transmission manner;

[0008] The power of a part of the output end is provided by the first motor, and the power of the other part of the output end is provided by the second motor;

[0009] The dual-input multi-output transmission box has two working conditions:

[0010] In the first working condition: one of the first motor and the second motor is in the on state, and the other is in the off state;

[0011] Under the second working condition: the first motor and the second motor are both in the on state.

[0012] As an optional technical solution of the first aspect, the dual-input multi-output transmission box includes a box body, in which a first clutch and a second clutch are installed, wherein the input shafts of the first clutch and the second clutch are respectively connected to the two input ends in a transmission manner;

[0013] The box body is also equipped with a third clutch and a fourth clutch, wherein:

[0014] The output shafts of the third clutch and the fourth clutch are respectively connected to an output end in transmission connection;

[0015] The input shaft of the third clutch is drivingly connected with the output shaft of the first clutch and the output shaft of the second clutch;

[0016] The input shaft of the fourth clutch and the output ends thereof except the output ends connected to the output shaft of the third clutch and the output shaft of the fourth clutch are all drivingly connected to the input shaft of the third clutch.

[0017] Further, the input shaft of the third clutch is installed with a first gear and a second gear; the output shaft of the first clutch is installed with a third gear, and the third gear is meshed with the first gear to form a reduction gear set;

[0018] The output shaft of the second clutch is mounted with a fourth gear, which meshes with the first gear to form a reduction gear set;

[0019] The input shaft of the fourth clutch is equipped with a fifth gear, which meshes with the second gear to form an acceleration gear set;

[0020] The output ends other than the output ends connected to the third clutch output shaft and the fourth clutch output shaft are equipped with a sixth gear, which meshes with the second gear to form an acceleration gear set.

[0021] Furthermore, it also includes a travel hydraulic pump, an air compressor, and a hydraulic pump group; wherein the output end of the travel hydraulic pump is transmission-connected to the output shaft of the fourth clutch, the output end of the air compressor is transmission-connected to the output shaft of the third clutch, and the hydraulic pump group is transmission-connected to the output ends except the output ends connected to the output shaft of the third clutch and the output shaft of the fourth clutch.

[0022] Furthermore, the hydraulic pump group provides power for one or more of the cooling fan, the boom flipping mechanism, and the vehicle body posture adjustment mechanism.

[0023] As an optional technical solution of the first aspect, the first motor and the second motor are electrically connected to different fixed power sources respectively through cables, or are electrically connected to the same fixed power source.

[0024] As an alternative technical solution of the first aspect, one of the first motor and the second motor is electrically connected to the mobile storage battery, and the other is electrically connected to the fixed power supply through a cable.

[0025] Optionally, the cable is wound around a cable reel.

[0026] As an alternative technical solution of the first aspect, both the first motor and the second motor are electrically connected to the mobile storage battery.

[0027] In the second aspect, an engineering vehicle, which is a rock drill, and the rock drill includes a power system with dual-motor input according to the first aspect or any alternative technical solution of the first aspect.

[0028] In the third aspect, a power system with dual-motor input includes a dual-input multi-output transmission case, which is provided with two input ends and multiple output ends;

[0029] The two input ends are respectively drivingly connected to the first motor and the second motor;

[0030] The second motor is electrically connected to a motor controller, and the motor controller is connected to a power battery;

[0031] The dual-input multi-output transmission case has three working conditions:

[0032] In the first working condition: the power at the output end is only provided by the first motor;

[0033] In the second working condition: the power at the output end is jointly provided by the first motor and the second motor;

[0034] In the third working condition: the output end drives the second motor through the dual-input multi-output transmission case to charge the power battery.

[0035] As an alternative technical solution of the third aspect, the dual-input multi-output transmission case includes a box body, and a first clutch and a second clutch are installed in the box body. Among them, the input shafts of the first clutch and the second clutch are respectively drivingly connected to the two input ends;

[0036] A countershaft is further installed in the box body, and a seventh gear and an eighth gear are installed on the countershaft;

[0037] A third gear is installed on the output shaft of the first clutch, a fourth gear is installed on the output shaft of the second clutch, and the third gear and the fourth gear are simultaneously meshed with the seventh gear;

[0038] A ninth gear is installed at the output end, and the ninth gear is meshed with the eighth gear.

[0039] Optionally, the output end is respectively connected to a hydraulic pump set and a drive axle.

[0040] In a fourth aspect, an engineering vehicle, which is an underground loader, and the underground loader includes a power system with dual-motor input in the third aspect or any optional technical solution of the third aspect.

[0041] Adopting the technical solution provided by the present utility model, compared with the prior art, it has the following beneficial effects:

[0042] The present utility model can control the working states of two motors under different working conditions, so as to achieve the purpose of the two motors working together under high load conditions and a single motor working under low load conditions, thereby reducing the rated power of a single motor and avoiding energy consumption waste caused by only using a high-power single motor under low load conditions. The space occupied by the dual motors is smaller than that of a high-power single motor, and the rated power of each motor in the dual motors is smaller, so a thinner cable can be connected for power supply, and the thinner cable is more convenient for both winding and releasing.

[0043] The present utility model is equipped with a movable power battery, which makes it more convenient to change the working site, and can also charge the power battery reversely, so that the system has the function of energy recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 Schematic diagram of a power system with dual-motor input in an embodiment of the present application;

[0045] Figure 2 Schematic diagram of a power system with dual-motor input in another embodiment of the present application;

[0046] Figure 3 Schematic diagram of a cable reel in the prior art.

[0047] Explanation of the reference numerals in the schematic diagrams:

[0048] First motor 101, second motor 102, cable reel 103, drive axle 104, travel hydraulic pump 105, air compressor 106, hydraulic pump group 107, motor controller 108, power battery 109;

[0049] First clutch 201, second clutch 202, third clutch 203, fourth clutch 204;

[0050] First gear 301, second gear 302, third gear 303, fourth gear 304, fifth gear 305, sixth gear 306;

[0051] Intermediate shaft 401, seventh gear 402, eighth gear 403, ninth gear 404. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0052] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the drawings and embodiments.

[0053] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of implementation. The change or adjustment of their relative relationship should also be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0054] In one embodiment, if Figure 1 As shown, the utility model proposes a power system with dual motor input, including a dual-input multi-output transmission box. The dual-input multi-output transmission box is provided with two input ends and multiple output ends, wherein the input end is connected to the motor, and the output end is connected to equipment such as a hydraulic pump and an air compressor.

[0055] Specifically, in this embodiment, the two input ends are respectively connected to the first motor 101 and the second motor 102, and the rated powers of the two motors can be the same or different. The power provided by the two motors is distributed to the output end through a transmission box.

[0056] In a high-load state, if only a single motor is used, the rated power of this motor is required to be higher, and the volume of the high-power motor is larger, which is inconvenient to install. Moreover, when in certain low-load states, turning on the high-power motor will cause energy waste. To solve this problem, in the utility model, the power of a part of the output end is provided by the first motor 101, and the power of the other part of the output end is provided by the second motor 102, that is, the two motors are responsible for providing power for a part of the output end respectively. The total load is distributed to the two motors, so that the rated power of each motor can be lower than the rated power value of the high-power motor when only one high-power motor is used to provide power for all output ends. In this way, the volume of a single motor of the first motor 101 and the second motor 102 is smaller than the volume of the high-power motor, which is more convenient to install. Moreover, in the present embodiment, since two motors are used, when one of the motors is damaged, the other motor can still be used under some working conditions, and the overall power system will not be paralyzed.

[0057] In this embodiment, the dual-input multi-output transmission box has two working conditions. Specifically, in the first working condition, one of the first motor 101 and the second motor 102 is in an on state, and the other is in an off state. For example, the first motor 101 is in an on state and the second motor 102 is in an off state, or the first motor 101 is in an off state and the second motor 102 is in an on state. In the second working condition, both the first motor 101 and the second motor 102 are in an on state.

[0058] In one embodiment, if Figure 1 As shown, the dual-input multi-output transmission box includes a box body, in which the first clutch 201 and the second clutch 202 are installed, and the first clutch 201 can be controlled to be in an engaged or disengaged state. Similarly, the second clutch 202 can also be controlled to be in an engaged or disengaged state. The input shafts of the first clutch 201 and the second clutch 202 are respectively connected to the two input ends in a transmission manner. Specifically, the input end connected to the input shaft of the first clutch 201 in a transmission manner is also connected to the first motor 101 in a transmission manner. When the first motor 101 is turned on, the first motor 101 can drive the input shaft of the first clutch 201 to rotate. The input end connected to the input shaft of the second clutch 202 in a transmission manner is also connected to the second motor 102 in a transmission manner. When the second motor 102 is turned on, the second motor 102 can drive the input shaft of the second clutch 201 to rotate.

[0059] The box body is also equipped with a third clutch 203 and a fourth clutch 204, which can control the third clutch 203 to be in an engaged or disengaged state, and similarly, the fourth clutch 204 can be controlled to be in an engaged or disengaged state. The output shafts of the third clutch 203 and the fourth clutch 204 are respectively connected to an output end.

[0060] The input shaft of the third clutch 203 is in driving connection with the output shaft of the first clutch 201 and the output shaft of the second clutch 202, that is, when the output shaft of the first clutch 201 rotates, the input shaft of the third clutch 203 also rotates. When the output shaft of the second clutch 202 rotates, the input shaft of the third clutch 203 also rotates. The input shaft of the third clutch 203 can also be driven to rotate by the output shafts of the first clutch 201 and the second clutch 203.

[0061] The input shaft and other output ends of the fourth clutch 204 are all connected to the input shaft of the third clutch 203. The other output ends mentioned here and below refer to the output ends other than the output ends connected to the output shaft of the third clutch 203 and the output shaft of the fourth clutch 204. When the input shaft of the third clutch 203 rotates, the input shaft and other output ends of the fourth clutch 204 can also be driven to rotate.

[0062] In one embodiment, ifFigure 1 As shown in Figure 1 , a first gear 301 and a second gear 302 are mounted on the input shaft of the third clutch 203. A third gear 303 is mounted on the output shaft of the first clutch 201. The third gear 303 meshes with the first gear 301 to form a reduction gear set. A fourth gear 304 is mounted on the output shaft of the second clutch 202. The fourth gear 304 meshes with the first gear 301 to form a reduction gear set.

[0063] A fifth gear 305 is mounted on the input shaft of the fourth clutch 204. The fifth gear 305 meshes with the second gear 302 to form an acceleration gear set. A sixth gear 306 is mounted on other output ends. The sixth gear 306 meshes with the second gear 302 to form an acceleration gear set.

[0064] In this embodiment, the dual-input multi-output transmission case is a reduction gear box.

[0065] In one embodiment, the output end drivingly connected to the traveling hydraulic pump 105 is drivingly connected to the output shaft of the fourth clutch 204. The output end drivingly connected to the air compressor 106 is drivingly connected to the output shaft of the third clutch 203. The hydraulic pump group 107 is drivingly connected to other output ends. Among them, the hydraulic pump group 107 provides power for one or more of a cooling fan, a boom turning mechanism, and a vehicle body attitude adjustment mechanism.

[0066] When the whole machine equipped with this power system travels, the first motor 101 is turned on, the first clutch 201 is in the engaged state, the second clutch 202 is in the disengaged state, the third clutch 203 is in the disengaged state, and the fourth clutch 204 is in the engaged state. Then the power can be transmitted to the traveling hydraulic pump 105 and the hydraulic pump group 107. The traveling hydraulic pump 105 provides the power for the whole machine to travel, and the hydraulic pump group 107 provides the power for actions such as the rotation of the cooling fan, the turning of the boom, and the adjustment of the vehicle body attitude.

[0067] After the whole machine reaches the working position, the second motor 102 is turned on, and the second clutch 202 and the third clutch 203 are in the engaged state. Then the power can be transmitted to the air compressor 106. In this state, the first motor 101 can be in the on state, the first clutch 201 and the fourth clutch 204 can be in the engaged state. At this time, the traveling hydraulic pump 105 and the hydraulic pump group 107 can be in the working state or the servo state according to the working needs. The first motor 101 can also be in the off state, and the first clutch 201 and the fourth clutch 204 can be in the disengaged state.

[0068] In this embodiment, the opening and closing of the first motor 101 and the second motor 102 can be controlled separately, so that the energy consumption under different working conditions can be flexibly controlled. For example, during drilling operations, the outputs of the two motors work together through a dual-input multi-output transmission box to ensure that the total output meets the requirements. Moreover, the two motors can also work simultaneously, avoiding the need for a motor with a large power when only a single motor is used for operation, thus reducing the cost.

[0069] In one embodiment, the first motor 101 and the second motor 102 are electrically connected to different fixed power sources or the same fixed power source through cables respectively. At this time, since a dual-motor is adopted, the rated power of each motor is small, and the diameter of the cable for supplying power to the motor is small, which is easy to roll up and release. Moreover, when the whole machine is in a walking state, only a single cable can be released, which is more convenient.

[0070] In this embodiment, the cable can be wound around a cable reel 103 as Figure 3 shown. The cable reel 103 is relatively mature in the prior art and will not be elaborated here.

[0071] In one embodiment, one of the first motor 101 and the second motor 102 is electrically connected to a mobile battery, and the other is electrically connected to a fixed power source through a cable. For example, the first motor 101 can be electrically connected to the mobile battery. At this time, there is no need to face the problem of releasing the cable when the whole machine is walking. And the cable connected to the second motor 102 can be wound around a cable reel 103 as Figure 2 shown. The cable reel 103 is relatively mature in the prior art and will not be elaborated here.

[0072] In one implementation scheme, both the first motor 101 and the second motor 102 are electrically connected to the mobile battery. In this implementation scheme, the whole machine is powered by the mobile battery, so there is no need to wind up and release the cable, and the whole machine does not need to be equipped with a cable reel 103.

[0073] In one embodiment, the present utility model also proposes an engineering vehicle, which is a rock drill, and this rock drill includes the power system with dual-motor input described above.

[0074] In one implementation scheme, the present utility model also proposes a power system with dual-motor input, such as Figure 2As shown, it includes a dual-input multi-output transmission box, which is provided with two input ends and multiple output ends. In this embodiment, the output ends are respectively connected to a hydraulic pump group 107 and a driving axle 104. The two input ends are respectively connected to the first motor 101 and the second motor 102. Among them, the second motor 102 is electrically connected to a motor controller 108, and the motor controller 108 is connected to a power battery 109. The power battery 109 can provide power for the second motor 102 to drive other equipment to operate. On the other hand, when the second motor 102 is towed backwards, the towed second motor 102 can charge the power battery 109 through the control of the motor controller 108. By equipping a movable power battery 109, it is more convenient to change the work site, and it also has the function of energy recovery, so that the power battery 109 can be charged.

[0075] The power battery 109 supplies power to the second motor 102 through the motor controller 108 , and when the second motor 102 is towed backward, the power battery 109 can be charged through the motor controller 108 . This technology is relatively mature in the prior art and will not be described in detail here.

[0076] The power source connected to the first motor 101 is different from the power source connected to the second motor 102 . For example, the first motor 101 may be connected to a fixed power source via a cable, and the cable may be wound on the cable reel 103 .

[0077] When the engineering vehicle is an underground scraper, in this solution, the dual-input multi-output transmission box has three working conditions:

[0078] In the first working condition, that is, when the whole machine is moving: the output end power is only provided by the first motor 101, and at this time the first motor 101 provides power to all output ends;

[0079] In the second working condition, that is, when the whole machine is shoveling: the output end power is provided by the first motor 101 and the second motor 102. When the power provided by the first motor 101 alone cannot meet the requirements in the first working condition, the second working condition can be selected, that is, the first motor 101 and the second motor 102 jointly provide power;

[0080] Under the third working condition, that is, when braking or going downhill: the output end drives the second motor 102 through a dual-input multi-output transmission box to charge the power battery 109. At this time, it is not the first motor 101 and the second motor 102 that provide power to the output end, but the transmission system of the underground shovel loader reverses the second motor 102, and then reversely charges the power battery 109 through the motor controller 108.

[0081] For a dual-input multi-output transmission box, in one embodiment, the dual-input multi-output transmission box includes a box body, in which a first clutch 201 and a second clutch 202 are installed, wherein the input shafts of the first clutch 201 and the second clutch 202 are respectively connected to the two input ends. A transition shaft 401 is also installed in the box body, and a seventh gear 402 and an eighth gear 403 are installed on the transition shaft 401, wherein the output shaft of the first clutch 201 is installed with a third gear 303, and the output shaft of the second clutch 202 is installed with a fourth gear 304, and the third gear 303 and the fourth gear 304 are simultaneously meshed with the seventh gear 402. A ninth gear 404 is installed at the output end, and the ninth gear 404 is meshed with the eighth gear 403.

[0082] In the first working condition, that is, when the whole machine is moving: the first clutch 201 is engaged, the cable reel 103 is powered on, the first motor 101 outputs power, the power is transmitted to the hydraulic pump group 107 and the drive axle 104, the second clutch 202 is disengaged, and the power battery 109, the motor controller 108, and the second motor 102 do not participate in the work.

[0083] In the second working condition, that is, when the whole machine is shoveling, the first clutch 201 and the second clutch 202 are both engaged, the first motor 101 and the second motor 102 output power, and the power is transmitted to the hydraulic pump group 107 and the drive axle 104. At this time, the cable drum 103 is connected to the power supply to provide power to the first motor 101, and the power battery 109 provides power to the second motor 102.

[0084] In the third working condition, i.e. braking or going downhill: the first clutch 201 is disengaged, the first motor 101 does not participate in the work, the second clutch 202 is engaged, the transmission system reverses the second motor 102, and then reversely charges the power battery 109 through the motor controller 108.

[0085] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A dual-motor input power system, characterized in that: It includes a dual-input multi-output transmission box, which is provided with two input ends and multiple output ends; The two input ends are respectively connected to the first motor (101) and the second motor (102); The power of a part of the output end is provided by the first motor (101), and the power of the other part of the output end is provided by the second motor (102); The dual-input multi-output transmission box has two working conditions: In a first working condition: one of the first motor (101) and the second motor (102) is in an on state, and the other is in an off state; In the second working condition: the first motor (101) and the second motor (102) are both in the on state.

2. The dual-motor input power system according to claim 1, characterized in that: The dual-input multi-output transmission box comprises a box body, in which a first clutch (201) and a second clutch (202) are installed, wherein the input shafts of the first clutch (201) and the second clutch (202) are respectively connected to the two input ends in a transmission manner; The box body is also equipped with a third clutch (203) and a fourth clutch (204), wherein: The output shafts of the third clutch (203) and the fourth clutch (204) are respectively connected to an output end in a transmission manner; The input shaft of the third clutch (203) is drivingly connected to the output shaft of the first clutch (201) and the output shaft of the second clutch (202); The input shaft of the fourth clutch (204) and the output ends other than the output ends connected to the output shafts of the third clutch (203) and the fourth clutch (204) are all drivingly connected to the input shaft of the third clutch (203).

3. The dual-motor input power system according to claim 2, characterized in that: The input shaft of the third clutch (203) is mounted with a first gear (301) and a second gear (302); The output shaft of the first clutch (201) is provided with a third gear (303), and the third gear (303) is meshed with the first gear (301) to form a reduction gear set; The output shaft of the second clutch (202) is provided with a fourth gear (304), and the fourth gear (304) is meshed with the first gear (301) to form a reduction gear set; The input shaft of the fourth clutch (204) is equipped with a fifth gear (305), which meshes with the second gear (302) to form an acceleration gear set; The output ends other than the output ends connected to the output shaft of the third clutch (203) and the output shaft of the fourth clutch (204) are equipped with a sixth gear (306), which meshes with the second gear (302) to form an acceleration gear set.

4. The dual-motor input power system according to claim 3, characterized in that: It also includes a travel hydraulic pump (105), an air compressor (106), and a hydraulic pump group (107); The output end of the travel hydraulic pump (105) is transmission-connected to the output shaft of the fourth clutch (204), the output end of the air compressor (106) is transmission-connected to the output shaft of the third clutch (203), and the hydraulic pump group (107) is transmission-connected to the output ends other than the output ends connected to the output shafts of the third clutch (203) and the fourth clutch (204).

5. The dual-motor input power system according to claim 1, characterized in that: The first motor (101) and the second motor (102) are electrically connected to different fixed power sources respectively through cables, or are electrically connected to the same fixed power source.

6. The dual-motor input power system according to claim 1, characterized in that: One of the first motor (101) and the second motor (102) is electrically connected to a mobile storage battery, and the other is electrically connected to a fixed power source via a cable; or, The first motor (101) and the second motor (102) are both electrically connected to the mobile storage battery.

7. The dual-motor input power system according to claim 5 or 6, characterized in that: The cable is wound on a cable drum (103).

8. An engineering vehicle, characterized in that: The engineering vehicle is a rock drilling rig, and the rock drilling rig includes a power system with dual motor input as described in any one of claims 1-7.

9. A dual-motor input power system, characterized in that: It includes a dual-input multi-output transmission box, which is provided with two input ends and multiple output ends; The two input ends are respectively connected to the first motor (101) and the second motor (102); The second motor (102) is electrically connected to a motor controller (108), and the motor controller (108) is connected to a power battery (109); The dual-input multi-output transmission box has three working conditions: In the first working condition: the output end power is provided only by the first motor (101); In the second working condition: the output end power is provided by the first motor (101) and the second motor (102); In the third working condition: the output end drives the second motor (102) to charge the power battery (109) through the dual-input multi-output transmission box.

10. The dual-motor input power system according to claim 9, characterized in that: The dual-input multi-output transmission box comprises a box body, in which a first clutch (201) and a second clutch (202) are installed, wherein the input shafts of the first clutch (201) and the second clutch (202) are respectively connected to the two input ends in a transmission manner; A transition shaft (401) is also installed in the box, and a seventh gear (402) and an eighth gear (403) are installed on the transition shaft (401); The output shaft of the first clutch (201) is installed with a third gear (303), the output shaft of the second clutch (202) is installed with a fourth gear (304), and the third gear (303) and the fourth gear (304) are simultaneously meshed with the seventh gear (402); The output end is provided with a ninth gear (404), and the ninth gear (404) is meshed with the eighth gear (403).

11. The dual-motor input power system according to claim 10, characterized in that: The output ends are respectively connected to a hydraulic pump group (107) and a drive axle (104).

12. An engineering vehicle, characterized in that: The engineering vehicle is an underground shovel loader, and the underground shovel loader includes a dual-motor input power system as described in any one of claims 9-11.

Images