CN115653031A - Power system of large-scale positive shovel type mining excavator - Google Patents
Power system of large-scale positive shovel type mining excavator Download PDFInfo
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- CN115653031A CN115653031A CN202211680131.XA CN202211680131A CN115653031A CN 115653031 A CN115653031 A CN 115653031A CN 202211680131 A CN202211680131 A CN 202211680131A CN 115653031 A CN115653031 A CN 115653031A
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- 238000005065 mining Methods 0.000 title claims abstract description 25
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 230000007246 mechanism Effects 0.000 claims abstract description 9
- 238000005381 potential energy Methods 0.000 claims abstract description 5
- 239000003638 chemical reducing agent Substances 0.000 claims description 21
- 239000003921 oil Substances 0.000 claims description 18
- 239000010720 hydraulic oil Substances 0.000 claims description 10
- 238000010248 power generation Methods 0.000 claims description 7
- 230000005855 radiation Effects 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 2
- 238000004146 energy storage Methods 0.000 claims 1
- 238000004804 winding Methods 0.000 abstract description 10
- 238000007599 discharging Methods 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000007710 freezing Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention discloses a power system of a large-scale positive shovel type mining excavator, wherein a first output port of a transfer case is connected with a generator, and a second output port of the transfer case is connected with a main pump; the generator is connected with an electric quantity storage device I; the electric quantity storage device I is connected with a water-cooling electric motor, an oil-cooling electric motor, a hoisting electric motor and a rotary electric motor; the winding electric motor is connected with an electric quantity storage device II, and the electric quantity storage device II is connected with the oil radiating motor; the main pump is connected with a main multi-way valve, and the main multi-way valve is connected with a hydraulic actuating mechanism; the invention takes an engine as a power source, one part of energy is converted into hydraulic energy by a main pump, the other part of energy is converted into electric energy, and a hoisting electric motor converts the gravitational potential energy of a bucket rod and a bucket when the bucket rod is lowered down into electric energy; the mining shovel has the advantages of improving the working condition adaptability and the use economy, having high use flexibility, strong working condition adaptability, large digging force and high mining efficiency, and the opening of the shovel can be controlled during discharging, thereby avoiding impact and reducing the damage to the mining car.
Description
Technical Field
The invention belongs to the technical field of mining engineering machinery, and particularly relates to a power system of a large-scale positive shovel type mining excavator.
Background
With the development of world economy, the scale of surface mines is continuously enlarged, the function of large-tonnage mining equipment is increasingly displayed, the hydraulic face shovel plays an important role as an important member, and particularly, the hydraulic face shovel starts to be comprehensively popularized in China. The operation cost and the use economy of the equipment are one of the most concerned key contents of mine enterprises, and the use flexibility and the working condition adaptability of the hydraulic face shovel are consistent and certain in domestic and foreign mine enterprises.
However, the existing large-scale positive shovel type mining excavator (commonly known as an electric shovel) needs to assist in dragging a power cable, so that the moving capacity is insufficient, the flexibility is limited, and the excavating and unloading actions are relatively single; meanwhile, compared with a loader and an electric shovel, the hydraulic face shovel has larger energy consumption, the cost for excavating single materials is higher, the domestic public praise and the rapid popularization process of the hydraulic face shovel are influenced to a certain extent, and the problem to be solved urgently is how to reduce the energy consumption and the single cost of the hydraulic face shovel.
Disclosure of Invention
Aiming at the problems, the invention provides a power system of a large-scale positive shovel type mining excavator.
The invention is realized by the following technical scheme: the engine is connected with a transfer case, a first output port of the transfer case is connected with the generator, and a second output port of the transfer case is connected with the main pump and the pilot pump;
the generator is connected with an electric quantity storage device I; the electric quantity storage device I is connected with the water-cooling electric motor, the electric quantity storage device I is connected with the oil-cooling electric motor through a control switch V, the electric quantity storage device I is connected with the hoisting electric motor through a control switch II, and the electric quantity storage device I is connected with the rotary electric motor through a control switch I; the hoisting electric motor is an electric power generation integrated machine, the hoisting electric motor is connected with an electric quantity storage device II through a control switch III, and the electric quantity storage device II is connected with the oil-radiating motor through a control switch IV;
the main pump is connected with a main multi-way valve, and the main multi-way valve is connected with a hydraulic actuating mechanism; the pilot pump is connected with a pilot valve group matched with the main multi-way valve;
the controller is connected with the winding electric motor, the rotary electric motor and the main pump in a control way; the handle and the pedals, the sensor and the engine and the transfer case are electrically connected to the controller; the sensor is used for detecting the state of the main multi-way valve.
It further comprises the following steps: the controller receives the numerical value transmitted back by the sensor from the main multi-way valve and the operation signals sent by the handle and the pedals, and adjusts the rotating speed and the output power of the engine and the output power and the flow of the main pump.
The hoisting electric motor is connected with a movable arm hoisting speed reducer and a hoisting brake;
when the handle and the pedal send instructions for lifting the bucket rod and the bucket, the controller unlocks the hoisting brake and adjusts the wiring mode of the hoisting electric motor to be in an electric state, the control switch II is closed, and the hoisting electric motor drives the movable arm hoisting speed reducer to rotate to perform lifting action;
when handle and pedal send and transfer dipper, when the scraper bowl instruction, controller unblock hoist stopper and adjustment hoist electric motor's wiring mode are the power generation state, and II disconnections of control switch, control switch III closure, the gravitational potential energy conversion when hoist electric motor transfers dipper, scraper bowl into the electric energy, save in electric quantity storage device II.
The hoisting brake, the hoisting electric motor and the movable arm hoisting speed reducer are integrated and assembled into a lifting unit.
When the electric quantity of the electric quantity storage device II is sufficient, the control switch V is switched off, the control switch IV is switched on, and the electric quantity storage device II supplies power to the oil-radiating motor to finish the heat radiation of the working hydraulic oil;
when the electric quantity of the electric quantity storage device II is insufficient, the control switch IV is switched off, the control switch V is switched on, and the electric quantity storage device I supplies power to the oil-radiating motor to finish the heat radiation of the working hydraulic oil.
The rotary electric motor is connected with a rotary speed reducer and a rotary brake; when the handle and the pedal send a rotation instruction, the controller unlocks the rotation brake and adjusts the wiring mode of the rotation electric motor, the control switch I is closed, and the rotation electric motor is electrified to drive the rotation speed reducer to rotate in a corresponding rotation direction and at a corresponding speed.
The rotary electric motor, the rotary speed reducer and the rotary brake are integrated and assembled into a rotary unit, and the number of the rotary units is two, four or six symmetrically arranged.
The hydraulic actuating mechanism comprises a left walking hydraulic motor, a right walking hydraulic motor, a left bucket oil cylinder, a right bucket oil cylinder, a left bucket opening oil cylinder, a right bucket opening oil cylinder and a bucket rod oil cylinder.
Compared with the prior art, the invention has the beneficial effects that:
an engine is used as a power source, a part of energy is converted into hydraulic energy by a main pump, a walking hydraulic motor is driven to realize equipment movement, and an oil cylinder is driven to realize bucket rod pushing, bucket digging and unloading; the other part of energy is converted into electric energy, the movable arm is driven to hoist to lift and lower the bucket rod and the bucket, the rotary speed reducer is driven to realize the relative rotation of the equipment for getting on and off the vehicle, and the electric motor is driven to finish the heat dissipation of the anti-freezing solution of the engine and the heat dissipation of the working hydraulic oil;
the hoisting electric motor is an integrated machine of a motor and a generator, converts gravitational potential energy generated when the bucket rod and the bucket are lowered into electric energy, and can be used for driving the electric motor to finish heat dissipation of working hydraulic oil;
the moving capacity of the large-scale front shovel type mining excavator is improved, the excavating action is enriched, the energy consumption and the unloading impact are reduced, and the working condition adaptability and the use economy are improved; need not to pull the cable, use the flexibility high, operating mode adaptability is strong, the digging force is big, excavation efficiency is high, and the scraper bowl opening is controllable when unloading, avoids assaulting, reduces the harm to the mine car.
Drawings
FIG. 1 is a schematic illustration of the powertrain of the present invention;
FIG. 2 is an assembly view of one embodiment of the present invention;
in the figure: 1. an engine, 2, a transfer case, 3, a generator, 4, a controller, 5, a main pump, 6, a pilot pump, 7, a left-running hydraulic motor, 8, a left bucket cylinder, 9, a left bucket cylinder, 10, an arm cylinder, 11, a right bucket cylinder, 12, a right bucket cylinder, 13, a right-running hydraulic motor, 14, a handle and a pedal, 15, a sensor, 16, a power storage device I, 17, a control switch I, 18, a rotary brake, 19, a rotary electric motor, 20, a rotary speed reducer, 21, a control switch II, 22, a winding brake, 23, a winding electric motor, 24, a movable arm winding speed reducer, 25, a control switch III, 26, a power storage device II, 27, a control switch IV, 28, an oil-dispersing electric motor, 29, a control switch V, 30, a water-dispersing electric motor, 31, a main multi-way valve, 32 and a pilot valve group.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The following detailed description of the principles of the invention is provided in connection with the accompanying drawings.
Referring to fig. 1 and 2, in the power system of the large-sized positive shovel mining excavator, an engine 1 is connected with a transfer case 2, a first output port of the transfer case 2 is connected with a generator 3, and a second output port of the transfer case 2 is connected with a main pump 5 and a pilot pump 6. The engine 1 is used as a power source of the system, part of energy is converted into hydraulic energy by the main pump 5 through the transfer case 2, and the other part of energy is converted into electric energy by the generator 3.
The generator 3 is connected with an electric quantity storage device I16, the electric quantity storage device I16 is connected with a water-cooling electric motor 30, the electric quantity storage device I16 is further connected with an oil-cooling electric motor 28 through a control switch V29, connected with a winding electric motor 23 through a control switch II 21 and connected with a rotation electric motor 19 through a control switch I17. The winding electric motor 23 is connected with an electric quantity storage device II 26 through a control switch III 25, and the electric quantity storage device II 26 is connected with an oil radiating electric motor 28 through a control switch IV 27.
The winding electric motor 23 is an electric power generation integrated machine, and the wiring mode of the winding electric motor is adjusted by the controller 4 to switch the electric power generation state. The hoisting electric motor 23 is connected with a movable arm hoisting speed reducer 24 and a hoisting brake 22, and the hoisting brake 22, the hoisting electric motor 23 and the movable arm hoisting speed reducer 24 are integrally assembled into a lifting unit, so that the mechanism is compact and convenient to install and maintain.
When the handle and the pedal 14 send out a bucket lifting rod and bucket instruction, the controller 4 unlocks the hoisting brake 22 and adjusts the wiring mode of the hoisting electric motor 23 to be in an electric state, the control switch II 21 is closed, the hoisting electric motor 23 drives the movable arm hoisting speed reducer 24 to rotate for lifting, the bucket full-bucket rate is ensured, and the bucket height is also prepared for unloading the mine car;
when the handle and the pedal 14 send an order of lowering the bucket rod and the bucket, the controller 4 unlocks the hoisting brake 22 and adjusts the wiring mode of the hoisting electric motor 23 to be in a power generation state, the control switch II 21 is disconnected, the control switch III 25 is closed, and the hoisting electric motor 23 converts gravitational potential energy generated when the bucket rod and the bucket are lowered into electric energy which is stored in the electric quantity storage device II 26.
When the electric quantity of the electric quantity storage device II 26 is sufficient, the control switch V29 is switched off, the control switch IV 27 is switched on, the electric quantity storage device II 26 supplies power to the oil-radiating motor 28 to finish the heat radiation of the working hydraulic oil, and on the premise of ensuring the heat radiation requirement, the power output of the engine is reduced, so that the purposes of energy conservation and emission reduction are achieved; when the electric quantity of the electric quantity storage device II 26 is insufficient, the control switch IV 27 is switched off, the control switch V29 is switched on, and the electric quantity storage device I16 supplies power to the oil-radiating motor 28 to finish the heat radiation of the working hydraulic oil.
A rotary speed reducer 20 and a rotary brake 18 are connected to the rotary electric motor 19. The rotary electric motor 19, the rotary speed reducer 20 and the rotary brake 18 are integrated into a rotary unit, the number of the rotary units is two, four or six, the rotary units are symmetrically arranged, and the symmetrical arrangement is adopted to ensure that the stress of the rotary mechanism is uniform
When the handle and the pedal 14 send a rotation command, the controller 4 unlocks the rotation brake 18 and adjusts the wiring mode of the rotation electric motor 19, the control switch I17 is closed, and the rotation electric motor 19 is electrified to drive the rotation speed reducer 20 to rotate in a corresponding rotation direction and at a corresponding speed.
The main pump 5 is connected with the pilot pump 6 through a transmission shaft, the main pump 5 is connected with a main multi-way valve 31, the main multi-way valve 31 is connected with a hydraulic actuating mechanism, and the hydraulic actuating mechanism comprises a left walking hydraulic motor 7, a right walking hydraulic motor 13, a left bucket oil cylinder 8, a right bucket oil cylinder 12, a left bucket opening oil cylinder 9, a right bucket opening oil cylinder 11 and a bucket rod oil cylinder 10. The pilot pump 6 is connected to a pilot valve group 32 that is engaged with the main multiplex valve 31.
The controller 4 controls the connection of the winding electric motor 23, the turning electric motor 19, and the main pump 5. The handle and pedals 14, the sensor 15, the engine 1, and the transfer case 2 are electrically connected to the controller 4. The sensor 15 is a pressure sensor, and is configured to detect a pressure condition of hydraulic oil output by each spool of the main multi-way valve 31. When the hydraulic power machine works, the controller 4 receives a pressure value of hydraulic oil returned by the sensor 15 from the main multi-way valve 31 and operation signals sent by the handle and the pedals 14, adjusts the rotating speed and the output power of the engine 1 and adjusts the output power and the flow of the main pump 5, achieves dynamic matching of power demand and output, and reduces energy waste.
In this embodiment, the handle and the pedal 14 send an action command, the pilot oil of the pilot pump 6 opens the valve core corresponding to the main multi-way valve 31 through the pilot valve group 32, the hydraulic energy of the main pump 5 flows into each hydraulic actuator through the opened main multi-way valve 31, the equipment movement is realized by the left and right traveling hydraulic motors 7 and 13, the arm pushing is realized by the arm cylinder 10, the bucket digging and recovering is realized by the left and right bucket cylinders 8 and 12, and the bucket opening and unloading is realized by the left and right bucket cylinders 9 and 11, that is, the digging and unloading are completed.
In this embodiment, the electric energy temporary storage electric quantity storage device i 16 output by the generator 3 is used for driving the boom hoisting electric motor 23 to rotate counterclockwise to wind the rope, so as to realize the lifting of the bucket rod and the bucket; on the other hand, for driving the electric rotating motor 19 to realize the relative rotation of the equipment for getting on or off the vehicle; and a part of the water-cooling motor 30 is used for driving the water-cooling motor to dissipate heat of the anti-freezing solution of the engine.
Therefore, the power system of the large-sized front-shovel mining excavator provided by the invention obviously improves the moving capacity of the large-sized front-shovel mining excavator, enriches the excavating action, reduces the energy consumption and the unloading impact, and improves the working condition adaptability and the use economy. Compared with an electric shovel, the mining shovel has the advantages that cables do not need to be dragged, the use flexibility is high, the working condition adaptability is strong, the digging force is large, the digging efficiency is high, the opening of the shovel bucket is controllable during discharging, impact is avoided, and the mining shovel is friendly to a mine car.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A power system of a large-scale positive shovel type mining excavator,
the method is characterized in that:
the engine (1) is connected with a transfer case (2), a first output port of the transfer case (2) is connected with a generator (3), and a second output port of the transfer case (2) is connected with a main pump (5) and a pilot pump (6);
the generator (3) is connected with an electric quantity storage device I (16); the electric quantity storage device I (16) is connected with a water-cooling electric motor (30), the electric quantity storage device I (16) is connected with an oil-cooling electric motor (28) through a control switch V (29), the electric quantity storage device I (16) is connected with a hoisting electric motor (23) through a control switch II (21), and the electric quantity storage device I (16) is connected with a rotary electric motor (19) through a control switch I (17); the hoisting electric motor (23) is an electric power generation integrated machine, the hoisting electric motor (23) is connected with an electric quantity storage device II (26) through a control switch III (25), and the electric quantity storage device II (26) is connected with the oil-radiating electric motor (28) through a control switch IV (27);
the main pump (5) is connected with a main multi-way valve (31), and the main multi-way valve (31) is connected with a hydraulic actuating mechanism; the pilot pump (6) is connected with a pilot valve group (32) matched with the main multi-way valve (31);
the controller (4) is connected with the hoisting electric motor (23), the rotary electric motor (19) and the main pump (5) in a control mode; the handle and the pedals (14), the sensor (15) and the engine (1) and the transfer case (2) are electrically connected to the controller (4); the sensor (15) is used for detecting the state of the main multi-way valve (31).
2. The power system of the large-scale positive-shovel mining excavator according to claim 1, wherein: the controller (4) receives a numerical value transmitted back from the main multi-way valve (31) by the sensor (15) and an operation signal sent by the handle and the pedals (14), and adjusts the rotating speed and the output power of the engine (1) and the output power and the flow of the main pump (5).
3. The power system of the large-scale positive-shovel mining excavator according to claim 1, wherein: the hoisting electric motor (23) is connected with a movable arm hoisting speed reducer (24) and a hoisting brake (22);
when the handle and the pedal (14) send out a bucket lifting rod and bucket instruction, the controller (4) unlocks the hoisting brake (22) and adjusts the wiring mode of the hoisting electric motor (23) to be in an electric state, the control switch II (21) is closed, and the hoisting electric motor (23) drives the movable arm hoisting speed reducer (24) to rotate to perform lifting action;
when the handle and the pedal (14) send an instruction for lowering the bucket rod and the bucket, the controller (4) unlocks the hoisting brake (22) and adjusts the wiring mode of the hoisting electric motor (23) to be in a power generation state, the control switch II (21) is disconnected, the control switch III (25) is closed, and the hoisting electric motor (23) converts gravitational potential energy generated when the bucket rod and the bucket are lowered into electric energy which is stored in the electric energy storage device II (26).
4. The power system of the large-scale positive-shovel mining excavator according to claim 3, wherein: the hoisting brake (22), the hoisting electric motor (23) and the movable arm hoisting speed reducer (24) are integrally assembled into a lifting unit.
5. The power system of the large-scale positive-shovel mining excavator according to claim 1, wherein: when the electric quantity of the electric quantity storage device II (26) is sufficient, the control switch V (29) is switched off, the control switch IV (27) is switched on, and the electric quantity storage device II (26) supplies power to the oil-radiating motor (28) to finish the heat radiation of the working hydraulic oil;
when the electric quantity of the electric quantity storage device II (26) is insufficient, the control switch IV (27) is switched off, the control switch V (29) is switched on, and the electric quantity storage device I (16) supplies power to the oil-radiating motor (28) to finish the heat radiation of the working hydraulic oil.
6. The power system of the large-scale positive-shovel mining excavator according to claim 1, wherein: the rotary electric motor (19) is connected with a rotary speed reducer (20) and a rotary brake (18); when the handle and the pedal (14) send out a rotation instruction, the controller (4) unlocks the rotation brake (18) and adjusts the wiring mode of the rotation electric motor (19), the control switch I (17) is closed, and the rotation electric motor (19) is electrified to drive the rotation speed reducer (20) to rotate in a corresponding rotation direction and at a corresponding speed.
7. The power system of the large-scale positive-shovel mining excavator according to claim 6, wherein: the rotary electric motor (19), the rotary speed reducer (20) and the rotary brake (18) are integrated and assembled into rotary units, and the number of the rotary units is two, four or six symmetrically arranged.
8. The power system of the large-scale positive-shovel mining excavator according to claim 1, wherein: the hydraulic actuating mechanism comprises a left walking hydraulic motor (7), a right walking hydraulic motor (13), a left bucket oil cylinder (8), a right bucket oil cylinder (12), a left bucket opening oil cylinder (9), a right bucket opening oil cylinder (11) and a bucket rod oil cylinder (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211680131.XA CN115653031A (en) | 2022-12-27 | 2022-12-27 | Power system of large-scale positive shovel type mining excavator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211680131.XA CN115653031A (en) | 2022-12-27 | 2022-12-27 | Power system of large-scale positive shovel type mining excavator |
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| CN115653031A true CN115653031A (en) | 2023-01-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211680131.XA Pending CN115653031A (en) | 2022-12-27 | 2022-12-27 | Power system of large-scale positive shovel type mining excavator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030132729A1 (en) * | 2000-05-23 | 2003-07-17 | Hideaki Yoshimatsu | Construction machinery |
| CN101037869A (en) * | 2006-03-15 | 2007-09-19 | 神钢建设机械株式会社 | Hybrid construction machine |
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| CN112878414A (en) * | 2021-01-12 | 2021-06-01 | 三一重机有限公司 | Driving system and method of hybrid power mechanical equipment |
| CN113482521A (en) * | 2021-07-23 | 2021-10-08 | 徐州徐工基础工程机械有限公司 | Parallel power system of rotary drilling rig |
| CN113565164A (en) * | 2021-09-26 | 2021-10-29 | 徐工集团工程机械股份有限公司科技分公司 | Loader control system, loader, and loader control method |
| CN114620625A (en) * | 2022-03-18 | 2022-06-14 | 山河智能装备股份有限公司 | Power recovery system and power recovery method for hoisting mechanism of engineering machinery |
| CN217994126U (en) * | 2022-04-22 | 2022-12-09 | 山东临工工程机械有限公司 | Hybrid transmission system of engineering machinery |
-
2022
- 2022-12-27 CN CN202211680131.XA patent/CN115653031A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030132729A1 (en) * | 2000-05-23 | 2003-07-17 | Hideaki Yoshimatsu | Construction machinery |
| CN101037869A (en) * | 2006-03-15 | 2007-09-19 | 神钢建设机械株式会社 | Hybrid construction machine |
| CN102155160A (en) * | 2011-01-29 | 2011-08-17 | 湖南山河智能机械股份有限公司 | Hybrid rotary drilling machine |
| CN112878414A (en) * | 2021-01-12 | 2021-06-01 | 三一重机有限公司 | Driving system and method of hybrid power mechanical equipment |
| CN113482521A (en) * | 2021-07-23 | 2021-10-08 | 徐州徐工基础工程机械有限公司 | Parallel power system of rotary drilling rig |
| CN113565164A (en) * | 2021-09-26 | 2021-10-29 | 徐工集团工程机械股份有限公司科技分公司 | Loader control system, loader, and loader control method |
| CN114620625A (en) * | 2022-03-18 | 2022-06-14 | 山河智能装备股份有限公司 | Power recovery system and power recovery method for hoisting mechanism of engineering machinery |
| CN217994126U (en) * | 2022-04-22 | 2022-12-09 | 山东临工工程机械有限公司 | Hybrid transmission system of engineering machinery |
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