CN210194734U - Automatic walking high-low speed switching device of excavator, electric control system and excavator - Google Patents
Automatic walking high-low speed switching device of excavator, electric control system and excavator Download PDFInfo
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- CN210194734U CN210194734U CN201920933237.3U CN201920933237U CN210194734U CN 210194734 U CN210194734 U CN 210194734U CN 201920933237 U CN201920933237 U CN 201920933237U CN 210194734 U CN210194734 U CN 210194734U
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Abstract
The invention provides an automatic walking high-low speed switching device of an excavator, an electric control system and the excavator, wherein the automatic walking high-low speed switching device comprises a pilot pump, an electromagnetic valve, a high-low speed switching valve, a controller and at least one pressure sensor, the pilot pump, the electromagnetic valve and the high-low speed switching valve are sequentially connected through an oil supply pipeline, the pressure sensor is used for detecting the pressure of an oil way and is in communication connection with the controller, and the controller is in communication connection with the electromagnetic valve and is used for controlling the electromagnetic valve to reverse according to the pressure value of the pressure sensor so as to realize the reversing of the high-low speed; the internal oil circuit of the walking motor is simplified, and the manufacturing cost of the walking motor is reduced; the running motor is prevented from continuously working under a high-pressure and high-speed state, and the service life of the running motor is prolonged; when the walking motor walks at a high speed and meets a large resistance, the walking motor can be automatically switched to low-speed walking, so that the problem that the walking motor is frequently switched in a critical resistance interval is solved.
Description
Technical Field
The disclosure relates to the technical field of excavators, in particular to an automatic walking high-low speed switching device of an excavator, an electric control system and the excavator.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The walking motor that present domestic and foreign crawler-type excavator used generally is 2 fast motors (thereby change the discharge capacity through the pivot angle that changes the walking motor sloping cam plate, divide into high-speed and low-speed), and walking motor provides big moment of torsion for crawler-type excavator during the low-speed, can make crawler-type excavator work in the great environment with the road surface resistance of the slope, and walking motor is the great rotational speed of crawler-type excavator during the high-speed, can make crawler-type excavator improve walking speed when the slope is little and ground resistance.
The inventor of the present disclosure finds in research that the current 2-speed switching of the traveling motor adopts manual switching, and the operator autonomously selects the traveling speed according to the working condition, which has the following disadvantages: (1) the walking motor is in a high-pressure high-rotating-speed working state when climbing at a high speed, and the service life of the walking motor is greatly shortened due to the working state; (2) in a complex road section, the high-speed state and the low-speed state need to be frequently switched, and the operation intensity is improved.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects of the prior art, the automatic walking high-low speed switching device of the excavator, the electric control system and the excavator are provided in the disclosure, the internal oil circuit of the walking motor is simplified, the manufacturing cost of the walking motor is reduced, the walking motor is prevented from frequently switching high-low speed states under a high-pressure high-speed state, and the service life of the walking motor is prolonged.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
in a first aspect, the present disclosure provides an automatic walking high-low speed switching device for an excavator;
the utility model provides an automatic high low-speed auto-change over device that walks of excavator, includes pilot pump, solenoid valve, high low-speed diverter valve, controller and at least one pressure sensor, pilot pump, solenoid valve and high low-speed diverter valve loop through the oil feed line and connect, pressure sensor is used for detecting oil circuit pressure and with controller communication connection, controller and solenoid valve communication connection for according to pressure sensor's pressure numerical control solenoid valve switching-over, and then realize the switching-over of high low-speed diverter valve.
The high-low speed switching valve is connected with the traveling motor through an oil supply pipeline and used for realizing high-low speed switching and traveling according to oil pressure switching of the high-low speed switching valve.
The device is further limited by comprising a working pump, a balance valve and a control valve, wherein the working pump, the control valve, the balance valve and the walking motor are sequentially connected through an oil supply pipeline.
As a further limitation, the balance valve and the high-low speed switching valve are connected through an oil supply pipeline.
As a further limitation, the pressure sensor is a pipeline pressure sensor, and is arranged on the oil outlet pipeline of the working pump.
As a further limitation, the pressure sensor is provided in plurality and is respectively arranged at different positions of the oil supply pipeline.
As a further limitation, the controller is one of 51 series single-chip microcomputers.
When the vehicle runs at a high speed: the working pump provides oil source for the control valve, the control valve supplies oil to the balance valve, then the balance valve supplies oil to the walking motor, meanwhile, the manual control button gives an instruction to the controller, the controller controls the electromagnetic valve to provide oil source for the high-low speed switching valve in a reversing mode, the high-low speed switching valve is reversed, and the walking motor is enabled to work in a small displacement mode by introducing high-pressure oil.
When the walking is subjected to large external resistance in the state, the pressure of a working oil way is increased, the pressure of the system is collected through the pressure sensor, and when the pressure is higher than a first set value, the electromagnetic valve is reversed through a command under the controller to enable the high-speed and low-speed switching valve to work at a low-speed working position, so that the motor works at a large displacement, and the high-speed and low-speed switching function is realized.
When the whole machine crosses a region with large resistance, the pressure of a working oil way is reduced, the pressure of the system is collected through a pressure sensor, and when the pressure is lower than a second set value, the electromagnetic valve is reversed through a command under the controller, so that the high-speed and low-speed switching valve is in a high-speed working position, the motor works in a small displacement, and the function of switching the high speed at a low speed is realized.
First setting value and setting mode: when the controller collects that the pressure of the pressure sensor is higher than (80%) of the set highest pressure of the overflow valve of the system, the controller gives an instruction when the controller continuously works for 2 seconds.
The second setting value and the setting mode are as follows: when the controller collects that the pressure of the pressure sensor is lower than the set highest pressure of a system overflow valve (80% of small displacement/large displacement), the controller gives a command.
In a second aspect, the present disclosure provides an excavator electric control system, which includes the excavator electric control automatic walking high-low speed switching device of the present disclosure.
In a third aspect, the present disclosure provides an excavator, which includes the electric control automatic walking high-low speed switching device of the excavator disclosed in the present disclosure.
In a fourth aspect, the present disclosure provides an excavator, including the excavator electrical control system described in the present disclosure.
Compared with the prior art, the beneficial effect of this disclosure is:
1. according to the hydraulic control system, the oil pressure sensor is arranged to detect the pressure of the oil supply pipeline, high-speed and low-speed control is performed according to the pressure condition of the oil supply pipeline, the internal oil circuit of the walking motor is simplified, and the manufacturing cost of the walking motor is reduced.
2. The content of this disclosure has avoided the walking motor to keep working under high pressure high speed state through the accurate control to the oil pressure, has improved the walking motor life-span.
3. The content of the disclosure enables the walking motor to automatically switch to low-speed walking when encountering large resistance during high-speed walking, thereby avoiding the problem of frequent switching of the walking motor in a critical resistance interval.
Drawings
Fig. 1 is a schematic structural view of an automatic walking high-low speed switching device of an excavator in the prior art according to embodiment 1 of the present disclosure.
Fig. 2 is a schematic structural view of an automatic walking high-low speed switching device of an excavator according to embodiment 1 of the present disclosure.
1-a control valve; 2-a working pump; 3-a pilot pump; 4-an electromagnetic valve; 5-a controller; 6-a balance valve; 7-high and low speed switching valve; 8-pressure sensor.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example 1:
as shown in fig. 1, the automatic travel high-low speed switching device for an excavator in the prior art is configured such that, during high-speed travel: the working pump 2 supplies oil source to the control valve 1, the control valve 1 supplies oil to the balance valve 6, and then the balance valve 6 supplies oil to the walking motor; meanwhile, a manual control button gives an instruction to the controller 5, the controller 5 controls the electromagnetic valve 4 to change the direction and provide an oil source for the high-low speed switching valve 7, the high-low speed switching valve 7 changes the direction, and the walking motor is enabled to work at a small displacement by introducing high-pressure oil.
When the external resistance is large during walking in this state, the pressure of the working oil path is increased, and when the pressure is higher than a set value (i.e. the comparison of the forces at the two ends of the high-low speed switching valve 7), the high-low speed switching valve 7 is pushed by the high-pressure oil to be in the original position, so that the motor is in large displacement work, and the high-speed and low-speed switching function is realized.
However, when the automatic walking high-low speed switching device of the excavator switches the low speed at a high speed, the output torque is immediately increased when the walking motor displacement is increased, the pressure on the working oil path is immediately reduced under the condition of the same resistance, the high-low speed switching valve 7 is switched to the high-speed position again for working, the high-low speed switching valve 7 works at a high speed, the pressure of the working oil path is increased again due to the fact that the resistance is not changed, the high-low speed switching valve 7 is pushed to switch, and the high-low speed switching valve 7 is frequently switched in a short time under the state, so that the shaking phenomenon occurs.
As shown in fig. 2, an embodiment 1 of the present disclosure provides an automatic walking high-low speed switching device for an excavator, including a pilot pump 3, a solenoid valve 4, a high-low speed switching valve 7, a controller 5 and a pressure sensor 8, where the controller is one of 51 series single-chip microcomputers, the pilot pump 3, the solenoid valve 4 and the high-low speed switching valve 7 are sequentially connected by an oil supply pipeline, the pressure sensor 8 is used for detecting oil line pressure and is in communication connection with the controller 5, and the controller 5 is in communication connection with the solenoid valve 4 and is used for controlling the direction change of the solenoid valve 4 according to a pressure value of the pressure sensor 8, thereby realizing the direction change of the high-low speed switching valve 7.
The high-low speed switching valve 7 is connected with the traveling motor through an oil supply pipeline and used for realizing high-low speed switching and traveling according to oil pressure switching of the high-low speed switching valve 7.
Still include working pump 2, balanced valve 6 and control valve 1, working pump 2, control valve 6, balanced valve 6 and walking motor loop through the oil supply pipe connection, balanced valve 6 passes through the oil supply pipe with high-low speed change-over valve 7 and is connected.
The pressure sensor is a pipeline type pressure sensor and is arranged on an oil outlet pipeline of the working pump.
When the vehicle runs at a high speed: the working pump 2 supplies oil source to the control valve 1, the control valve 1 supplies oil to the balance valve 6, then the walking motor is supplied with oil through the balance valve 6, meanwhile, the manual control button gives an instruction to the controller 5, the controller 5 controls the electromagnetic valve 4 to change direction to supply oil source to the high-low speed switching valve 7, the high-low speed switching valve 7 changes direction, and the walking motor is in small displacement work by introducing high-pressure oil.
When the walking is subjected to large external resistance in this state, the pressure of the working oil way is increased, the pressure of the system is collected through the pressure sensor 8, and when the pressure is higher than a first set value, the electromagnetic valve 4 is reversed through a command of the controller 5, so that the low-speed working position of the high-low speed switching valve 7 is enabled, the motor is enabled to work at large displacement, and the function of switching the low speed at high speed is realized.
When the whole machine crosses a region with large resistance, the pressure of a working oil way is reduced, the pressure of the system is collected through the pressure sensor 8, and when the pressure is lower than a second set value, the electromagnetic valve 4 is reversed through an instruction of the controller 5, so that the high-low speed switching valve 7 is in a high-speed working position, the motor is in small-displacement work, and the low-speed switching high-speed function is realized.
First setting value and setting mode: when the controller collects that the pressure of the pressure sensor 8 is higher than (80%) of the set maximum pressure of the overflow valve of the system and continuously works for 2 seconds, the controller 5 gives an instruction.
The second setting value and the setting mode are as follows: when the controller collects that the pressure of the pressure sensor 8 is lower than the set highest pressure of the system overflow valve (80% of small displacement/large displacement), the controller 5 gives a command.
Example 2:
Example 3:
the embodiment 3 of the present disclosure provides an excavator electric control system, which includes the excavator electric control automatic walking high-low speed switching device according to the embodiment 1 or 2 of the present disclosure.
Example 4:
the embodiment 4 of the present disclosure provides an excavator, which includes the electric control automatic walking high-low speed switching device of the excavator in the embodiment 1 or 2 of the present disclosure.
Example 5:
the embodiment 5 of the present disclosure provides an excavator, which includes the excavator electrical control system described in the embodiment 3 of the present disclosure.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (10)
1. The high-low speed switching device for the automatic walking of the excavator is characterized by comprising a pilot pump, an electromagnetic valve, a high-low speed switching valve, a controller and at least one pressure sensor, wherein the pilot pump, the electromagnetic valve and the high-low speed switching valve are sequentially connected through an oil supply pipeline, the pressure sensor is used for detecting the pressure of an oil way and is in communication connection with the controller, and the controller is in communication connection with the electromagnetic valve and is used for controlling the electromagnetic valve to change according to the pressure value of the pressure sensor so as to realize the change of the high-low speed switching valve.
2. The automatic traveling high-low speed switching device of an excavator according to claim 1, further comprising a traveling motor, wherein the high-low speed switching valve is connected to the traveling motor through an oil supply line, and is configured to perform high-low speed switching and traveling in accordance with oil pressure switching of the high-low speed switching valve.
3. The automatic walking high-low speed switching device of the excavator as claimed in claim 2, further comprising a working pump, a balance valve and a control valve, wherein the working pump, the control valve, the balance valve and the walking motor are sequentially connected through an oil supply pipeline.
4. The automatic walking high-low speed switching device of excavator according to claim 3, wherein said balance valve and high-low speed switching valve are connected by oil supply pipeline.
5. The automatic walking high-low speed switching device of excavator according to claim 3, wherein said pressure sensor is a pipeline type pressure sensor, which is disposed on the oil outlet pipeline of the working pump.
6. The automatic walking high-low speed switching device of the excavator as claimed in claim 3, wherein the pressure sensors are provided in plurality and are respectively arranged at different positions of the oil supply pipeline.
7. The automatic walking high-low speed switching device of the excavator as claimed in claim 1, wherein the controller is one of 51 series single-chip microcomputers.
8. An electric control system of an excavator, which is characterized by comprising the electric control automatic walking high-low speed switching device of the excavator, wherein the electric control automatic walking high-low speed switching device is defined in any one of claims 1 to 7.
9. An excavator, characterized by comprising the electrically controlled automatic walking high-low speed switching device of the excavator as claimed in any one of claims 1 to 7.
10. An excavator comprising the excavator electrical control system of claim 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920933237.3U CN210194734U (en) | 2019-06-19 | 2019-06-19 | Automatic walking high-low speed switching device of excavator, electric control system and excavator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920933237.3U CN210194734U (en) | 2019-06-19 | 2019-06-19 | Automatic walking high-low speed switching device of excavator, electric control system and excavator |
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| CN210194734U true CN210194734U (en) | 2020-03-27 |
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| CN201920933237.3U Active CN210194734U (en) | 2019-06-19 | 2019-06-19 | Automatic walking high-low speed switching device of excavator, electric control system and excavator |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112112216A (en) * | 2020-10-15 | 2020-12-22 | 柳州柳工挖掘机有限公司 | Excavator hydraulic system, excavator and control method |
| CN112127416A (en) * | 2020-10-10 | 2020-12-25 | 徐州徐工矿业机械有限公司 | Novel walking motor unblock and high-low speed control hydraulic system |
| CN112681446A (en) * | 2020-12-24 | 2021-04-20 | 中联重科土方机械有限公司 | High-low speed switching control method and system for excavator walking |
| CN113107827A (en) * | 2021-05-13 | 2021-07-13 | 雷沃工程机械集团有限公司 | Method for preventing LS system engineering machinery from shaking during working and engineering machinery |
| CN114215803A (en) * | 2021-12-23 | 2022-03-22 | 山河智能装备股份有限公司 | Engineering machine, walking system and control method |
| CN114592560A (en) * | 2022-04-13 | 2022-06-07 | 徐州徐工矿业机械有限公司 | Excavator and intelligent walking control self-adaptive system and method thereof |
-
2019
- 2019-06-19 CN CN201920933237.3U patent/CN210194734U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112127416A (en) * | 2020-10-10 | 2020-12-25 | 徐州徐工矿业机械有限公司 | Novel walking motor unblock and high-low speed control hydraulic system |
| CN112112216A (en) * | 2020-10-15 | 2020-12-22 | 柳州柳工挖掘机有限公司 | Excavator hydraulic system, excavator and control method |
| CN112681446A (en) * | 2020-12-24 | 2021-04-20 | 中联重科土方机械有限公司 | High-low speed switching control method and system for excavator walking |
| CN113107827A (en) * | 2021-05-13 | 2021-07-13 | 雷沃工程机械集团有限公司 | Method for preventing LS system engineering machinery from shaking during working and engineering machinery |
| CN114215803A (en) * | 2021-12-23 | 2022-03-22 | 山河智能装备股份有限公司 | Engineering machine, walking system and control method |
| CN114592560A (en) * | 2022-04-13 | 2022-06-07 | 徐州徐工矿业机械有限公司 | Excavator and intelligent walking control self-adaptive system and method thereof |
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Address after: 266500 No. 75 East Huanghe Road, Huangdao District, Qingdao City, Shandong Province Patentee after: Lovol Heavy Industry Group Co.,Ltd. Address before: 266500 No. 75 East Huanghe Road, Huangdao District, Qingdao City, Shandong Province Patentee before: LOVOL Engineering Machinery Group Co.,Ltd. |