CN216343185U - Load-sensitive electric control system and engineering machinery - Google Patents
Load-sensitive electric control system and engineering machinery Download PDFInfo
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- CN216343185U CN216343185U CN202122704119.5U CN202122704119U CN216343185U CN 216343185 U CN216343185 U CN 216343185U CN 202122704119 U CN202122704119 U CN 202122704119U CN 216343185 U CN216343185 U CN 216343185U
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- 230000001105 regulatory effect Effects 0.000 claims description 18
- 230000001276 controlling effect Effects 0.000 claims description 11
- 238000006073 displacement reaction Methods 0.000 claims description 10
- 239000003921 oil Substances 0.000 description 29
- 239000010720 hydraulic oil Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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Abstract
The utility model provides a load-sensitive electric control system and engineering machinery, wherein the load-sensitive electric control system comprises a plunger variable pump, a multi-way valve bank and a plurality of actuating elements, wherein the plunger variable pump is connected with an engine; further comprising: the first sensor is used for detecting the outlet pressure of the plunger variable pump; a plurality of second sensors for detecting load pressures of the corresponding actuators; and the controller is electrically connected with the plurality of pilot main valves, the first sensor and the plurality of second sensors and is used for controlling the valve core opening degree of the pilot valve corresponding to the actuating element according to the pressure difference value between the outlet pressure of the plunger variable pump and the load pressure of the actuating element. The utility model solves the problem of poor flow adjustability of the existing load-sensitive control system, realizes the control of the oil flow of the working circuit where different execution elements are positioned, meets the operation requirements of different working conditions, and improves the flexibility and the diversity of the application of the load-sensitive electric control system.
Description
Technical Field
The utility model relates to the technical field of hydraulic control, in particular to a load-sensitive electric control system and engineering machinery.
Background
The traditional load-sensitive control system comprises a variable plunger pump, the variable plunger pump is provided with a pressure compensator, most load-sensitive control systems do not work under constant pressure, when the external load changes, the working pressure of the load-sensitive control systems is different, so a control valve with a special sensing oil circuit and a special valve port is needed to realize the control of the load-sensitive control system, when the load-sensitive control system does not work, the control valve cuts off a pressure signal between an actuating cylinder (or a motor) and the variable plunger pump, so that the variable plunger pump is switched to a low-pressure waiting state when the load-sensitive control system does not work, when the control valve works, the control valve needs to obtain the pressure requirement from the actuating cylinder (or the motor) firstly and transmits the pressure signal to the variable plunger pump, so that the variable plunger pump starts to respond to the pressure of the load-sensitive control system, the flow required by the load sensitive control system is controlled by the opening of the slide valve, the flow requirement of the load sensitive control system is fed back to the variable plunger pump through a signal channel and a control valve, the load sensitive control system is used for matching the pressure and the flow through hydraulic control logic, the adjustability is poor, and the power of the engine and the power of the variable plunger pump cannot be effectively matched in real time, so that the engine continuously works in an optimal oil consumption area, and the operation requirements of various data are not facilitated.
SUMMERY OF THE UTILITY MODEL
The present invention provides a load-sensitive electric control system and an engineering machine, so as to solve the above problem.
In order to achieve the above object, in a first aspect of the present invention, a load-sensitive electronic control system is provided, which includes a plunger variable pump connected to an engine, a multi-way valve set, and a plurality of actuators, where the multi-way valve set includes a plurality of pilot valves, and the plunger variable pump is connected to the plurality of actuators through the plurality of pilot valves in a one-to-one correspondence; the load sensitive electronic control system further comprises:
the first sensor is arranged at the outlet of the plunger variable pump and used for detecting the outlet pressure of the plunger variable pump;
the second sensors are arranged on a connecting loop of the oil outlet of each pilot valve and the corresponding actuating element, and are used for detecting the load pressure of the corresponding actuating element;
and the controller is electrically connected with the plurality of pilot main valves, the first sensor and the plurality of second sensors and is used for controlling the valve core opening degree of the pilot valve corresponding to the actuating element according to the pressure difference between the outlet pressure of the plunger variable pump and the load pressure of the actuating element.
Specifically, the load-sensitive electronic control system further comprises: and the regulating valve is arranged on a working oil path of the plunger variable pump and is electrically connected with the controller, and the regulating valve is used for regulating the outlet pressure of the plunger variable pump.
Specifically, the regulating valve is an electric proportional pressure reducing valve.
Specifically, the load-sensitive electronic control system further comprises: the swing angle sensor is electrically connected with the controller and is used for detecting the inclination angle of the swash plate of the plunger variable pump;
the controller is also used for controlling the opening degree of the regulating valve according to a pressure difference value between the outlet pressure of the plunger variable pump and the load pressure of an actuating element and the inclination angle of the swash plate of the plunger variable pump so as to regulate the outlet pressure of the plunger variable pump.
Specifically, the multiple valve block further includes:
and the control valves are electrically connected with the controller, one control valve is installed on the working oil way of each pilot valve, and the controller controls the opening degree of the valve core of the pilot valve corresponding to the control valve by controlling the opening degree of the control valve.
Specifically, the control valve is an electro proportional pressure reducing valve.
Specifically, the load-sensitive electronic control system further comprises: and the pressure reducing valve bank is arranged on a working oil path between the multi-way valve bank and the plunger variable pump and is used for adjusting the oil pressure of the working oil path between the multi-way valve bank and the plunger variable pump.
Specifically, the first sensor and the second sensor are both pressure sensors.
In another aspect of the present invention, an engineering machine is provided, which includes the above-mentioned load-sensitive electric control system.
The utility model provides a load-sensitive electric control system, wherein a first sensor detects outlet pressure of a variable pump, a second sensor detects load pressure of an actuating element, and a controller controls the opening degree of a valve core of a pilot valve corresponding to the actuating element through a pressure difference value between the outlet pressure of the variable pump and the load pressure of the actuating element, so that the flow of oil in a working circuit corresponding to the pilot valve is controlled, the flow of the oil in the working circuit where different pilot valves are located can be controlled, and the problem of poor flow adjustability of the load-sensitive control system in the prior art is solved.
The load-sensitive electric control system and the engineering machinery provided by the utility model solve the problem of poor flow adjustability of the existing load-sensitive control system, and realize the control of the oil flow of working circuits in which different execution elements are positioned, thereby meeting the operation requirements of different working conditions and improving the flexibility and diversity of the application of the load-sensitive electric control system.
Additional features and advantages of embodiments of the utility model will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the embodiments of the utility model without limiting the embodiments of the utility model. In the drawings:
fig. 1 is a hydraulic schematic diagram of a load-sensitive electronic control system provided by the present invention.
Description of the reference numerals
1 engine 2 plunger variable displacement pump
3 multi-way valve set 4 actuating element
5 first sensor 6 second sensor
7-regulating valve 8 swing angle sensor
9 control valve 10 pressure reducing valve group
11 electric control handle 12 accessory
13 tank 31 pilot valve
Detailed Description
The following detailed description of embodiments of the utility model refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the embodiments of the present invention, unless otherwise specified, the use of directional terms such as "upper, lower, top, and bottom" is generally used with respect to the orientation shown in the drawings or the positional relationship of the components with respect to each other in the vertical, or gravitational direction.
In a first aspect of the present invention, there is provided a load-sensitive electrical control system, fig. 1 is a hydraulic schematic diagram of the load-sensitive electrical control system provided by the present invention, the load-sensitive electrical control system comprising: the multi-way valve group 3 comprises a plurality of pilot valves 31, and the plunger variable pump 2 is connected with the plurality of actuating elements 4 in a one-to-one correspondence manner through the plurality of pilot valves 31; the first sensor 5 is arranged at the outlet of the plunger variable pump 2 and used for detecting the outlet pressure of the plunger variable pump 2; a plurality of second sensors 6 are arranged on a connecting loop of the oil outlet of each pilot valve 31 and the corresponding actuating element 4, and each second sensor 6 is used for detecting the load pressure of the corresponding actuating element 4; and a controller electrically connected to the plurality of pilot main valves 31, the first sensor 5, and the plurality of second sensors 6, and configured to control a valve opening degree of the pilot valve 31 corresponding to the actuator 4 according to a pressure difference between the outlet pressure of the plunger variable displacement pump 2 and the load pressure of the actuator 4.
The load-sensitive electric control system provided by the utility model detects the outlet pressure of the plunger variable pump 2 through the first sensor 5, the load pressure of each corresponding actuator 4 is detected by a plurality of second sensors 6, the controller controls the valve core opening degree of the pilot valve 31 corresponding to the actuator 4 according to the pressure difference value between the outlet pressure of the plunger variable displacement pump 2 and the load pressure of the actuator 4, thereby controlling the flow of the oil in the working circuit of the executive component 4, simultaneously controlling the flow of the oil in the working circuits of a plurality of different executive components 4 through the controller, meeting the working requirements of the executive components 4 under different working conditions, meanwhile, the controller is convenient for workers to adjust the flow of oil in a working loop where the corresponding execution element 4 is located according to the working requirements of different execution elements 4, and the flexibility and the diversity of the application of the load-sensitive electric control system are improved.
In one embodiment, as shown in fig. 1, in a hydraulic system of a mini excavator, a plurality of actuators 4 are hydraulic cylinders and hydraulic motors, the plurality of hydraulic cylinders are respectively used for controlling a bucket, an arm and a boom of the excavator, the plurality of hydraulic motors are respectively used for controlling a swing mechanism, a left travel mechanism and a right travel mechanism of the excavator, a plunger variable pump 2 is correspondingly connected with each hydraulic cylinder and each hydraulic motor through a pilot valve 31 in a multi-way valve set 3, it is further noted that the pilot valve 31 is a two-way three-position four-way electromagnetic valve, a second sensor 6 is arranged at an inlet and an outlet of each two-way three-position four-way electromagnetic valve, in practical application, a load speed requirement of the actuator 4 is sent to a controller through an electric control handle 11, the controller adjusts an oil flow rate on a working circuit corresponding to the actuator 4 according to the obtained load speed requirement, the controller controls the valve core opening degree of the pilot valve 31 on the working circuit where the actuating element 4 is located according to the pressure difference value between the outlet pressure of the plunger variable pump 2 and the load pressure of the actuating element 4, which is detected by the first sensor 5 and the second sensor 6, so as to control the flow rate of the hydraulic oil flowing through the actuating element 4 and further control the load speed of the actuating element 4, and the controller controls the valve core opening degree of the corresponding pilot valve 31 according to the motion requirements of different parts of the mini-excavator, so as to adjust the load speed of the actuating element 4 connected with the pilot valve 31.
In order to stabilize the outlet pressure of the plunger variable displacement pump 2 and ensure the smooth operation of the load-sensitive electric control system, specifically, the load-sensitive electric control system further comprises: the regulating valve 7 is installed on the working oil path of the plunger variable pump 2 and electrically connected with the controller, the regulating valve 7 is used for regulating the outlet pressure of the plunger variable pump 2, and the regulating valve 7 is an electric proportional pressure reducing valve.
In order to adjust the outlet pressure of the plunger variable displacement pump 2, in particular, the load-sensitive electronic control system further comprises: the swing angle sensor 8 is electrically connected with the controller, and the swing angle sensor 8 is used for detecting the inclination angle of the swash plate of the plunger variable displacement pump 2; the controller is also used for controlling the opening degree of the regulating valve 7 according to the pressure difference value between the outlet pressure of the plunger variable pump 2 and the load pressure of the actuating element 4 and the inclination angle of the swash plate of the plunger variable pump 2 so as to regulate the outlet pressure of the plunger variable pump 2. After acquiring the inclination angle of the swash plate of the plunger variable pump 2 and the pressure difference between the outlet pressure of the plunger variable pump 2 and the load pressure of the actuator 4, the controller outputs corresponding control current to the regulating valve 7 according to the inclination angle and the pressure difference to control the valve core opening of the regulating valve 7, thereby regulating the outlet pressure of the plunger variable pump 2.
In order to control the hydraulic oil flow on the working circuit where the plurality of actuators 4 are located, as shown in fig. 1, specifically, the multi-way valve group 3 further includes: and the control valves 9 are all electrically connected with the controller, one control valve 9 is installed on the working oil path of each pilot valve 31, the controller controls the opening degree of the control valve 9 so as to control the valve core opening degree of the pilot valve 31 corresponding to the control valve 9, and the control valve 9 is an electric proportional pressure reducing valve. In practical application, the controller obtains the opening area required by the valve core of the pilot valve 31 on the working circuit corresponding to the actuator 4 according to the pressure difference value between the outlet pressure of the plunger variable pump 2 and the load pressure of the actuator 4, then outputs corresponding control current to the corresponding control valve 9, controls the opening degree of the valve core of the pilot valve 31 through the control valve 9, realizes the control of the flow of the hydraulic oil on the working circuit corresponding to the actuator 4, and meets the requirements of different working conditions.
In order to ensure that the oil pressure in the working oil path of the load-sensitive electronic control system is stable and the whole load-sensitive electronic control system works stably, as shown in fig. 1, specifically, the load-sensitive electronic control system further includes: the pressure reducing valve group 10 is installed on the multi-way valve group 3 and the working oil way between the plunger variable displacement pumps 2 and used for adjusting the oil pressure of the working oil way between the multi-way valve group 3 and the plunger variable displacement pumps 2, and the pressure reducing valve group 10 comprises a plurality of pressure reducing valves which are arranged in parallel.
In particular, the first sensor 5 and the second sensor 6 are both pressure sensors.
As shown in fig. 1, the load-sensitive electronic control system further includes an auxiliary 12 and an oil tank 13, and oil discharge ports of the plunger variable displacement pump 2, the pressure reducing valve group 10, the control valve 9 and the pilot valve 31 are all communicated with the oil tank 13.
In another aspect of the utility model, an engineering machine is provided, which comprises the load-sensitive electric control system.
The utility model provides a load-sensitive electric control system, wherein a first sensor detects outlet pressure of a variable pump, a second sensor detects load pressure of an actuating element, and a controller controls the opening degree of a valve core of a pilot valve corresponding to the actuating element through a pressure difference value between the outlet pressure of the variable pump and the load pressure of the actuating element, so that the flow of oil in a working circuit corresponding to the pilot valve is controlled, the flow of the oil in the working circuit where different pilot valves are located can be controlled, and the problem of poor flow adjustability of the load-sensitive control system in the prior art is solved.
The load-sensitive electric control system and the engineering machinery provided by the utility model solve the problem of poor flow adjustability of the existing load-sensitive control system, and realize the control of the oil flow of working circuits in which different execution elements are positioned, thereby meeting the operation requirements of different working conditions and improving the flexibility and diversity of the application of the load-sensitive electric control system.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the utility model is not described in any way for the possible combinations in order to avoid unnecessary repetition.
Those skilled in the art will appreciate that all or part of the steps in the method for implementing the above embodiments may be implemented by a program, which is stored in a storage medium and includes several instructions to enable a single chip, a chip, or a processor (processor) to execute all or part of the steps in the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as disclosed in the embodiments of the present invention as long as it does not depart from the spirit of the embodiments of the present invention.
Claims (9)
1. A load-sensitive electric control system comprises a plunger variable pump (2) connected with an engine (1), a multi-way valve bank (3) and a plurality of actuating elements (4), wherein the multi-way valve bank (3) comprises a plurality of pilot valves (31), and the plunger variable pump (2) is connected with the actuating elements (4) in a one-to-one correspondence mode through the pilot valves (31); characterized in that, the load-sensitive electric control system further comprises:
the first sensor (5) is arranged at the outlet of the plunger variable pump (2) and used for detecting the outlet pressure of the plunger variable pump (2);
a plurality of second sensors (6), one second sensor (6) is installed on a connecting loop of an oil outlet of each pilot valve (31) and the corresponding actuating element (4), and the second sensor (6) is used for detecting the load pressure of the corresponding actuating element (4);
and the controller is electrically connected with the plurality of pilot valves (31), the first sensor (5) and the plurality of second sensors (6) and is used for controlling the valve element opening degree of the pilot valve (31) corresponding to the actuating element (4) according to the pressure difference value between the outlet pressure of the plunger variable displacement pump (2) and the load pressure of the actuating element (4).
2. The load sensitive electrical control system of claim 1, further comprising:
and the regulating valve (7) is installed on a working oil path of the plunger variable pump (2) and electrically connected with the controller, and the regulating valve (7) is used for regulating the outlet pressure of the plunger variable pump (2).
3. A load sensitive electrical control system according to claim 2, wherein the regulating valve (7) is an electro proportional pressure reducing valve.
4. The load sensitive electrical control system of claim 3, further comprising:
the swing angle sensor (8) is electrically connected with the controller, and the swing angle sensor (8) is used for detecting the inclination angle of the swash plate of the plunger variable pump (2);
the controller is also used for controlling the opening degree of the regulating valve (7) according to a pressure difference value between the outlet pressure of the plunger variable pump (2) and the load pressure of an actuating element (4) and the inclination angle of the swash plate of the plunger variable pump (2) so as to regulate the outlet pressure of the plunger variable pump (2).
5. The load-sensitive electrical control system according to claim 1, wherein the multiway valve block (3) further comprises:
and the control valves (9) are all electrically connected with the controller, one control valve (9) is installed on the working oil path of each pilot valve (31), and the controller controls the opening degree of the valve core of the pilot valve (31) corresponding to the control valve (9) by controlling the opening degree of the control valve (9).
6. A load sensitive electrical control system according to claim 5, wherein the control valve (9) is an electro proportional pressure reducing valve.
7. The load sensitive electrical control system of claim 1, further comprising:
and the pressure reducing valve group (10) is arranged on a working oil path between the multi-way valve group (3) and the plunger variable pump (2) and is used for adjusting the oil pressure of the working oil path between the multi-way valve group (3) and the plunger variable pump (2).
8. The load sensitive electrical control system according to claim 1, wherein the first sensor (5) and the second sensor (6) are both pressure sensors.
9. A work machine comprising a load sensitive electrical control system as claimed in any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122704119.5U CN216343185U (en) | 2021-11-05 | 2021-11-05 | Load-sensitive electric control system and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122704119.5U CN216343185U (en) | 2021-11-05 | 2021-11-05 | Load-sensitive electric control system and engineering machinery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216343185U true CN216343185U (en) | 2022-04-19 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122704119.5U Active CN216343185U (en) | 2021-11-05 | 2021-11-05 | Load-sensitive electric control system and engineering machinery |
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| Country | Link |
|---|---|
| CN (1) | CN216343185U (en) |
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2021
- 2021-11-05 CN CN202122704119.5U patent/CN216343185U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Shaanxi Zhonglian Western earthwork Machinery Co.,Ltd. Assignor: ZOOMLION HEAVY INDUSTRY SCIENCE AND TECHNOLOGY Co.,Ltd. Contract record no.: X2023980042754 Denomination of utility model: Load sensitive electronic control system and construction machinery Granted publication date: 20220419 License type: Common License Record date: 20231010 |
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| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Zoomlion earth moving machinery Co.,Ltd. Assignor: ZOOMLION HEAVY INDUSTRY SCIENCE AND TECHNOLOGY Co.,Ltd. Contract record no.: X2023980043517 Denomination of utility model: Load sensitive electronic control system and construction machinery Granted publication date: 20220419 License type: Common License Record date: 20231017 |
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| EE01 | Entry into force of recordation of patent licensing contract |