CN217150406U

CN217150406U - Quantitative system variable control system of electric excavator

Info

Publication number: CN217150406U
Application number: CN202121389605.6U
Authority: CN
Inventors: 李强; 刘淑强; 王进; 王学兰; 田淑文
Original assignee: Shandong Lingong Construction Machinery Co Ltd
Current assignee: Shandong Lingong Construction Machinery Co Ltd
Priority date: 2021-06-22
Filing date: 2021-06-22
Publication date: 2022-08-09
Anticipated expiration: 2031-06-22

Abstract

The utility model discloses an electric excavator ration system quantization control system, it belongs to the engineering machine tool field. The system mainly comprises a complete machine controller and more than two sub-control systems, wherein each sub-control system comprises a pilot control element, a sub-system motor, a constant delivery pump and an executing element, the pilot control element and the sub-system motors are respectively connected with the complete machine controller, the sub-system motors are connected with the constant delivery pumps, the constant delivery pumps are connected with the executing elements through electromagnetic directional valves, and the electromagnetic directional valves are connected with the pilot control elements. The utility model discloses an operator can carry out flow distribution according to the intention, and independent control between each executive component action of excavator has avoided the flow loss to realize the energy-conservation of complete machine, improved work efficiency and power battery's duration simultaneously. The utility model discloses mainly used electric excavator.

Description

Quantitative system variable control system of electric excavator

Technical Field

The utility model belongs to the engineering machine tool field, specifically speaking especially relates to an electric excavator ration system quantization control system.

Background

In the field of engineering machinery, the existing excavator mainly comprises an electric excavator and a common internal combustion engine type excavator, and a control system of the excavator is mainly divided into a throttling control system, a load sensing control system, a negative flow control system and a positive flow control system. No matter which control system is adopted by the excavator, independent control can not be realized between actions of all executing elements of the excavator without being influenced by actions of other executing elements. At present, the distribution of flow among the actions of each actuating element of the excavator needs to be completed through an integrated main valve, which causes large back pressure energy loss and can not realize the free distribution of the flow and power among the actions of each actuating element according to the intention of an operator. Secondly, high-power motors and variable plunger pumps on the market are high in cost, integrated main control valves are high in casting difficulty and machining difficulty, market supply is limited, and meanwhile cost is high. The whole machine adopts a plunger type variable pump, so that the requirements on the cleanliness of the whole machine oil product and a hydraulic system are high, and the subsequent maintenance cost is high.

Compared with a common internal combustion engine type excavator, the electric excavator has the advantages that the idling speed can be set to be 0, the hydraulic system of the common excavator drives the main pump to provide flow for the hydraulic system through the motor, and the flow distribution cannot be finely distributed according to each action requirement, so that energy waste is caused. At present, an electric excavator still controls a motor according to engine characteristics (as shown in fig. 1), namely, under a certain fixed gear, the motor works according to a fixed rotating speed, and cannot regulate the speed within a full rotating speed range, so that the performance of the motor cannot be fully exerted, overflow and back pressure loss of the electric excavator is still large, flow distribution of a variable pump driven by the motor is carried out from a main valve to each execution element in an excavator power output control mode, flow power distribution among actions of each execution element is influenced and limited by actions of other execution elements, and flow distribution cannot be completely carried out according to the intention of an operator, so that the operation performance and the whole machine working efficiency are influenced.

Disclosure of Invention

The to-be-solved technical problem of the utility model is: the quantitative system variable control system of the electric excavator overcomes the defects of the prior art, realizes that an operator can distribute flow according to intention, and each executing element of the excavator is independently controlled between actions, avoids flow loss, realizes energy conservation of the whole excavator, and simultaneously improves the working efficiency and the cruising ability of a power battery.

The quantitative system variable control system of the electric excavator comprises a complete machine controller and more than two sub-control systems, wherein each sub-control system comprises a pilot control element, a sub-system motor, a constant delivery pump and an execution element, the pilot control element and the sub-system motors are respectively connected with the complete machine controller, the sub-system motors are connected with the constant delivery pumps, the constant delivery pumps are connected with the execution elements through electromagnetic directional valves, and the electromagnetic directional valves are connected with the pilot control elements.

Preferably, a pressure sensor is arranged between the fixed displacement pump and the electromagnetic directional valve, and the pressure sensor is connected with the complete machine controller.

Preferably, the number of the sub-control systems is seven, and the executing elements of the seven sub-control systems are a boom mechanism, a bucket mechanism, an arm mechanism, a swing mechanism, a multifunctional auxiliary tool, a left walking mechanism and a right walking mechanism respectively.

Preferably, the pilot control element comprises an electric control handle, and the electric control handle is connected with the whole machine controller through an inclination angle sensor.

Preferably, the pilot control element comprises an electric control foot valve, and the electric control foot valve is connected with the whole machine controller through a tilt angle sensor.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model discloses an all add subsystem motor and constant delivery pump of an independent control on every action system of electric excavator, and drive the constant delivery pump through this subsystem motor and provide the flow demand for each action, the output and the rotational speed of every subsystem motor are according to the automatically controlled handle or the automatically controlled pedal valve signal of angle sensor that the system gathered, and the load pressure signal that pressure sensor feedbacks is confirmed, realize the output of the different flows of constant delivery pump through controlling subsystem motor rotational speed, thereby reach the system and need how many flow constant delivery pumps give the accurate control of how much flow, realize the purpose that the constant delivery pump variable was used, greatly reduced manufacturing cost;

2. the utility model adopts the quantitative pump to be matched with the subsystem motor, and compared with the prior variable pump, the subsequent maintenance cost and the requirement on the cleanliness of the hydraulic system are greatly reduced;

3. the electric control main control valve of the system of the utility model is changed from an integrated form to a single form, thereby greatly reducing the processing difficulty of the main control valve, and reducing the cost of the whole machine and the subsequent maintenance cost;

4. the utility model discloses when realizing the compound control of a plurality of actions of excavator system, every action flow distribution is not influenced by other actions, and every action can be independently controlled, and can realize flow distribution according to operator's intention, improved controllability and complete machine work efficiency;

5. the utility model discloses can be according to the system's needs, each branch system motor is according to action needs output corresponding rotational speed and power, and the branch system motor that does not have the action is in zero rotational speed or lower rotational speed state to reach the energy-conserving mesh of system's wide range, strengthen the duration of battery.

Drawings

FIG. 1 is a schematic diagram of a conventional overall control system for an electric excavator;

FIG. 2 is a schematic diagram of a control system of the present invention;

FIG. 3 is an enlarged view of a portion A of FIG. 2;

fig. 4 is a partially enlarged view of a portion B in fig. 2.

In the figure, 1, an electric control handle; 2. a tilt sensor; 3. an electromagnetic directional valve; 4. a boom mechanism; 5. a pressure sensor; 6. a complete machine controller; 7. a subsystem motor; 8. a constant delivery pump; 9. an oil tank; 10. a bucket mechanism; 11. a bucket rod mechanism; 12. a swing mechanism; 13. a multifunctional auxiliary tool; 14. a left travel mechanism; 15. a right travel mechanism; 16. an electrically controlled foot valve.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings and embodiments:

the first embodiment is as follows: as shown in fig. 2 to 4, the quantitative system quantitative control system of the electric excavator includes a complete machine controller 6 and a plurality of sub-control systems, in this embodiment, seven sub-control systems are taken as an example for description, each sub-control system includes a pilot control element, a sub-system motor 7, a constant delivery pump 8 and an execution element, the pilot control element and the sub-system motor 7 are respectively connected with the complete machine controller 6, the sub-system motor 7 is connected with the constant delivery pump 8, the constant delivery pump 8 is connected with the execution element through an electromagnetic directional valve 3, the electromagnetic directional valve 3 is connected with the pilot control element, and the constant delivery pump 8 of each sub-control system is respectively connected with an oil tank 9; a pressure sensor 5 is arranged between the constant delivery pump 8 and the electromagnetic directional valve 3, and the pressure sensor 5 is connected with a complete machine controller 6 through a control circuit.

The actuating elements of the seven sub-control systems are a boom mechanism 4, a bucket mechanism 10, an arm mechanism 11, a swing mechanism 12, a multifunctional auxiliary tool 13, a left traveling mechanism 14 and a right traveling mechanism 15, respectively.

The pilot control element comprises an electric control handle 1, the electric control handle 1 is connected with a complete machine controller 6 through an inclination angle sensor 2, the sub-control systems of the movable arm mechanism 4 and the bucket mechanism 10 share one electric control handle, and the electric control handle is respectively connected with the electromagnetic directional valves 3 of the sub-control systems of the movable arm mechanism 4 and the bucket mechanism 10 through control circuits; the branch control systems of the bucket rod mechanism 11 and the swing mechanism 12 share one electric control handle, and the electric control handle is respectively connected with the electromagnetic directional valves 3 of the branch control systems of the bucket rod mechanism 11 and the swing mechanism 12 through control circuits.

Example two: the pilot control element comprises an electric control foot valve 16, the electric control foot valve 16 is connected with the whole machine controller 6 through an inclination angle sensor 2, and the sub-control systems of the multifunctional auxiliary tool 13, the left walking mechanism 14 and the right walking mechanism 15 are respectively connected with the whole machine controller 6 through the electric control foot valve 16 and the inclination angle sensor 2; the rest is the same as the first embodiment.

The utility model discloses a control method as follows:

step 1, an operator operates an electric control handle 1 or an electric control foot valve 16, at the moment, a tilt angle sensor 2 and a pressure sensor 5 generate corresponding flow and pressure signals and input the signals into a complete machine controller 6 through a control circuit, and the complete machine controller 6 generates rotating speed and output power control signals of a corresponding subsystem motor 7 according to the corresponding input signals; the operator can operate any one or simultaneously operate a plurality of sub-control systems;

step 2, the complete machine controller 6 controls the corresponding subsystem motor 7 to reach the preset rotating speed generated by the complete machine controller 6 in the step 1 according to the control signal;

step 3, the corresponding subsystem motor 7 drives the constant delivery pump 8 to output corresponding flow to the corresponding subsystem control system;

and 4, generating corresponding signals by the electric control handle 1 or the electric control foot valve 16 at the same time, and controlling the electromagnetic directional valve 3 to change the direction by a control circuit, so that the hydraulic oil is supplied to corresponding execution elements through the electromagnetic directional valve 3. At the moment, the action of the executive component in each sub-control system is independently controlled without being influenced by other actions, and the sub-system motor 7 outputs corresponding rotating speed and power according to the system and action requirements; in the non-action sub-control system, the inclination angle sensor 2 and the pressure sensor 5 have no signals, at the moment, the complete machine controller 6 controls the sub-system motor 7 of the sub-control system to be in a standby state at the rotating speed of 0 or lower, at the moment, the electromagnetic reversing valve 3 is positioned in the middle position, oil pumped out by the constant delivery pump 8 passes through the electromagnetic reversing valve 3 and returns to the oil tank 9, and therefore the purpose of saving energy of the system is achieved.

The utility model discloses the system is quantitative system, but the rotational speed of subsystem motor 7 can correspond the rotational speed in real time according to the angular signal and the system pressure signal output of gathering automatically controlled handle 1 or automatically controlled foot valve 16 to can give corresponding flow output according to the system actual need flow, complete machine controller 6 generates required output power signal according to input 2 signals of inclination sensor and 5 signals of pressure sensor simultaneously, control motor 7's power output, thereby play the control that becomes more meticulous, energy-conserving purpose.

Claims

1. The utility model provides an electric excavator ration system quantization control system which characterized in that: including complete machine controller (6) and the branch control system more than two, every divides control system all to include pilot control component, subsystem motor (7), constant delivery pump (8) and execute component, and pilot control component and subsystem motor (7) are connected with complete machine controller (6) respectively, and subsystem motor (7) are connected with constant delivery pump (8), and constant delivery pump (8) are connected with execute component through electromagnetic directional valve (3), and electromagnetic directional valve (3) are connected with pilot control component.

2. The variable-quantity control system of the quantitative system of the electric excavator according to claim 1, wherein: and a pressure sensor (5) is arranged between the constant delivery pump (8) and the electromagnetic directional valve (3), and the pressure sensor (5) is connected with the whole machine controller (6).

3. The variable control system of the quantitative system of the electric excavator according to claim 2, wherein: the number of the sub-control systems is seven, and the executing elements of the seven sub-control systems are a movable arm mechanism (4), a bucket mechanism (10), a bucket rod mechanism (11), a swing mechanism (12), a multifunctional auxiliary tool (13), a left walking mechanism (14) and a right walking mechanism (15) respectively.

4. The quantitative system variable control system of an electric excavator according to claim 3, wherein: the pilot control element comprises an electric control handle (1), and the electric control handle (1) is connected with the whole machine controller (6) through an inclination angle sensor (2).

5. The quantitative system variable control system of an electric excavator according to claim 3, wherein: the pilot control element comprises an electric control foot valve (16), and the electric control foot valve (16) is connected with the whole machine controller (6) through a tilt angle sensor (2).