CN112482482B - Digging machine - Google Patents
Digging machine Download PDFInfo
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- CN112482482B CN112482482B CN202011572875.0A CN202011572875A CN112482482B CN 112482482 B CN112482482 B CN 112482482B CN 202011572875 A CN202011572875 A CN 202011572875A CN 112482482 B CN112482482 B CN 112482482B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention provides an excavator, which comprises a frame, wherein a main pump assembly and a main valve assembly are mounted on the frame, a linear traveling electromagnetic valve is further mounted on the frame, the input end of the linear traveling electromagnetic valve is connected with the output end of a pilot pump, and the output end of the linear traveling electromagnetic valve is connected with a linear traveling valve core; the output end of the first main pump is connected with the first input end of the straight-line walking valve, and the first output end of the straight-line walking valve is connected with the input end of the left walking valve. A method for hoisting an excavator judges whether left-hand movement, right-hand movement and movable arm hoisting actions are operated simultaneously, and if yes, a straight-line walking hoisting mode is determined. The linear traveling valve is independently controlled by using an external linear traveling electromagnetic valve, the reversing time of the linear traveling valve core is conveniently and freely controlled, the linear traveling valve is prevented from being influenced when a movable arm is operated, the condition that the traveling device is switched between a single-pump oil supply state and a double-pump oil supply state is avoided, and the stability under a hoisting mode is improved.
Description
Technical Field
The invention relates to the technical field of engineering machinery, in particular to an excavator and an excavator hoisting method.
Background
The hydraulic excavator has a linear traveling function, the function is to ensure that the traveling speeds of the two sides are consistent and the deviation is prevented when the crawler belts on the two sides travel simultaneously and then move for the third action, when the excavator performs hoisting operation, the excavator needs to travel while finely adjusting the position of a hoisted material, and the hoisting operation is simultaneous operation of left and right traveling and boom ascending, namely, the operation of traveling while hoisting a heavy object.
As shown in fig. 3 and 4, a conventional excavator includes a frame, a main pump assembly and a main valve assembly are mounted on the frame, the main pump assembly includes a first main pump, a second main pump and a pilot pump, and the valve assembly includes a linear travel valve, a left travel valve, a right travel valve, a first boom valve and a second boom valve. When the excavator only walks, the first main pump and the second main pump simultaneously provide working oil for the walking device; when the excavator only lifts a heavy object, the first main pump and the second main pump simultaneously provide working oil for the movable arm; in the hoisting mode, signal oil passages of the pilot pump entering each action valve core through d1, d2 and d3 are cut off and cannot return to an oil tank, pressure is built at a PTA port at the end of the linear traveling valve, the linear traveling valve core is reversed, the first main pump provides working oil for the movable arm independently, and the second main pump provides working oil for the left traveling valve and the right traveling valve independently.
The above technical solution has the following disadvantages: the linear traveling valve core is influenced by the displacement of the movable arm valve core, the linear traveling valve core is reversed under the condition that the movable arm valve core only moves by 2mm, when a movable arm is subjected to micro-operation, the movable arm is similar to moving and not moving, at the moment, the displacement of the movable arm valve core changes frequently about 2mm, the linear traveling valve core is frequently reversed, finally, the traveling device is switched between a single-pump oil supply state and a double-pump oil supply state continuously, the frame shakes forwards and backwards during traveling, and the frame is unstable, so that materials shake and accurate construction cannot be conducted.
Disclosure of Invention
The invention aims to overcome the defects of the traditional technology and provides an excavator and an excavator hoisting method, wherein the linear traveling valve is independently controlled, and the linear traveling valve is prevented from being influenced when a movable arm is operated.
The aim of the invention is achieved by the following technical measures: an excavator comprises a frame, wherein a main pump assembly and a main valve assembly are mounted on the frame, the main pump assembly comprises a first main pump, a second main pump and a pilot pump, the valve assembly comprises a linear traveling valve, a left traveling valve, a right traveling valve, a first movable arm valve and a second movable arm valve, a linear traveling electromagnetic valve is further mounted on the frame, the input end of the linear traveling electromagnetic valve is connected with the output end of the pilot pump, and the output end of the linear traveling electromagnetic valve is connected with a linear traveling valve core; the output end of the first main pump is connected with the first input end of the linear traveling valve, and the first output end of the linear traveling valve is connected with the input end of the left traveling valve; the output end of the first main pump is connected with the input end of a first movable arm valve through a one-way valve LCb, and the second output end of the linear traveling valve is connected with the first input end of a second movable arm valve; the output end of the second main pump is connected with the input end of the right walking valve and the second input end of the linear walking valve; the output end of the second main pump is connected with the second input end of the second boom valve through a check valve CP1, and the output end of the second boom valve and the output end of the first boom valve are connected with the boom cylinder through a check valve CCb. When the left walking valve and the right walking valve are independently operated, namely when the left walking pilot valve and the right walking pilot valve are independently operated by a person in operation, the linear walking valve core is not reversed, and at the moment, the first input end of the linear walking valve is communicated with the first output end of the linear walking valve. When the first movable arm valve and the second movable arm valve are operated independently, namely when a worker operates the movable arm pilot valve independently in operation, the linear walking valve core is not reversed, the second movable arm valve core is not reversed, and at the moment, the second input end of the second movable arm valve is communicated with the output end of the second movable arm valve.
The linear traveling electromagnetic valve is a proportional electromagnetic valve. Simple structure, easy assembly and use.
And the frame is also provided with a rotary brake-releasing electromagnetic valve, the input end of the rotary brake-releasing electromagnetic valve is connected with the output end of the pilot pump, and the output end of the rotary brake-releasing electromagnetic valve is connected with the rotary motor. The rotary brake-releasing electromagnetic valve is used for controlling the rotary motor, and has simple structure and easy assembly and use.
The rotary brake-releasing electromagnetic valve is a two-position three-way electromagnetic valve. Simple structure, easy assembly and use.
The hoisting method of the excavator comprises the following steps:
s1, judging whether the left walking, the right walking and the movable arm lifting actions are operated simultaneously, if so, confirming the straight walking hoisting mode;
and S2, starting the linear traveling electromagnetic valve, reversing the linear traveling valve core, communicating the first input end of the linear traveling valve with the second output end of the linear traveling valve, communicating the second input end of the linear traveling valve with the first output end of the linear traveling valve, reversing the second movable arm valve core, and communicating the first input end of the second movable arm valve with the output end of the second movable arm valve.
In step S2, when the boom pilot pressure is increased to the set value, the straight travel spool is not reversed, and at this time, the travel speed is not changed; when the pilot pressure of the movable arm continues to increase and the movable arm starts to act, the linear traveling valve core is reversed.
In step S2, when the boom pilot pressure decreases and the boom stops operating, the straight travel spool is not reversed, and the travel speed is not changed at this time; and when the pilot pressure of the movable arm is continuously reduced to a set value, the linear traveling valve core is reversed.
The lowest pilot pressure of the movable arm is 6.4 bar; the pilot pressure set value of the movable arm is 7 bar; when the movable arm starts to act, the pilot pressure of the movable arm is 11 bar. The range from the set value of the pilot pressure of the movable arm to the pilot pressure of the movable arm when the movable arm starts to act is used as an insensitive area, the linear traveling electromagnetic valve is not operated when the pilot pressure of the movable arm is in the insensitive area, the linear traveling valve core is inconvenient to maintain in situ, and frequent reversing of the linear traveling valve core is avoided, so that the frame is frequently accelerated and decelerated, and the shaking is caused. The lowest pilot pressure of a movable arm of 6.4bar is adopted in the existing part of excavators, and when the movable arm starts to act, the pilot pressure of the movable arm is 11bar, so that the existing equipment is conveniently and directly transformed.
When the left walking valve and the right walking valve are independently operated, the straight walking valve core is not reversed, and at the moment, the first input end of the straight walking valve is communicated with the first output end of the straight walking valve.
When the first movable arm valve and the second movable arm valve are independently operated, the second movable arm valve core is not reversed, and at the moment, the second input end of the second movable arm valve is communicated with the output end of the second movable arm valve.
In conclusion, due to the adoption of the technical scheme, the linear traveling valve is independently controlled by using the external linear traveling electromagnetic valve, the reversing time of the linear traveling valve core is conveniently and freely controlled, the linear traveling valve is prevented from being influenced when the movable arm is operated, the condition that the traveling device is continuously switched between the single-pump oil supply state and the double-pump oil supply state is avoided, and the stability under the hoisting mode is improved.
Drawings
The invention is further described with reference to the following figures and detailed description:
FIG. 1 is a schematic structural view of an oil pressure system of an excavator according to the present invention;
FIG. 2 is a schematic diagram of a hydraulic control strategy for an excavator according to the present invention;
FIG. 3 is a schematic diagram of a hydraulic system of an excavator in the background art;
fig. 4 is a schematic diagram of a hydraulic control strategy of an excavator in the prior art.
In the figure: 1-a main pump assembly; 101-a first main pump; 102-a second main pump; 103-a pilot pump; 2-a main valve assembly; 201-straight line walking valve core; 202-left travel spool; 203-a first boom spool; 204-right travel spool; 205-a second boom spool; 3-a left travel pilot valve; 4-a right travel pilot valve; 5-a boom pilot valve; 6-a boom cylinder; 7-a rotary motor; 8-left travel motor; 9-right travel motor; 10-double electromagnetic valve group.
Detailed Description
For the convenience of understanding of the present invention, the present invention will be further described with reference to the following examples and drawings, and the description of the embodiments is not intended to limit the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships that are necessary based on a specific orientation of a device or an element shown in the drawings, are configured or operated in a specific orientation, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of indicated technical features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. In the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" are used in a broad sense, and may be, for example, mechanically or electrically connected, or may be connected through two elements, directly or indirectly through an intermediate medium, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Example 1: as shown in fig. 1, an excavator includes a frame, a main pump assembly 1 and a main valve assembly 2 are mounted on the frame, the main pump assembly 1 includes a first main pump 101, a second main pump 102 and a pilot pump 103, and the valve assembly 2 includes a straight-line travel valve, a left travel valve, a right travel valve, a first boom valve and a second boom valve.
Specifically, a linear travel valve spool 201 is arranged on the linear travel valve, a duplex solenoid valve group 10 is further installed on the frame, the duplex solenoid valve group 10 comprises a linear travel solenoid valve and a rotary release brake solenoid valve, an input end of the linear travel solenoid valve and an input end of the rotary release brake solenoid valve are respectively connected with an output end of the pilot pump 103, an output end of the linear travel solenoid valve is connected with the linear travel valve spool 201, and an output end of the rotary release brake solenoid valve is connected with the rotary motor 7. Preferably, the linear traveling electromagnetic valve adopts a proportional electromagnetic valve, and the rotary brake-releasing electromagnetic valve adopts a two-position three-way electromagnetic valve, so that the structure is simple, and the assembly and the use are easy. The left traveling valve is provided with a left traveling valve core 202, the frame is also provided with a left traveling pilot valve 3, the input end of the left traveling pilot valve 3 is connected with the output end of the pilot pump 103, and the output end of the left traveling pilot valve 3 is connected with the left traveling valve core 202. The right traveling valve is provided with a right traveling valve core 204, the frame is also provided with a right traveling pilot valve 4, the input end of the right traveling pilot valve 4 is connected with the output end of the pilot pump 103, and the output end of the right traveling pilot valve 4 is connected with the right traveling valve core 204. The first movable arm valve is provided with a first movable arm valve spool 203, the second movable arm valve is provided with a second movable arm valve spool 205, the frame is further provided with a movable arm pilot valve 5, the input end of the movable arm pilot valve 5 is connected with the output end of the pilot pump 103, and the output end of the movable arm pilot valve 5 is connected with the first movable arm valve spool 203 and the second movable arm valve spool 205.
The output end of the first main pump 101 is connected with the first input end of the linear traveling valve, the first output end of the linear traveling valve is connected with the input end of the left traveling valve, and the output end of the left traveling valve is connected with the left traveling motor 8; the output end of the first main pump 101 is connected with the input end of a first movable arm valve through a one-way valve LCb, and the second output end of the linear traveling valve is connected with the first input end of a second movable arm valve; the output end of the second main pump 102 is connected with the input end of the right traveling valve and the second input end of the linear traveling valve, and the output end of the right traveling valve is connected with the right traveling motor 9; an output end of the second main pump 102 is connected to a second input end of the second boom valve through a check valve CP1, and an output end of the second boom valve and an output end of the first boom valve are connected to the boom cylinder 6 through a check valve CCb.
Example 2: as shown in fig. 2, a method for hoisting an excavator in embodiment 1 includes the following steps:
and S1, judging whether the left traveling, the right traveling and the boom lifting action are operated simultaneously.
If not, in the first situation, when the left traveling valve and the right traveling valve are operated independently, that is, when the left traveling pilot valve 3 and the right traveling pilot valve 4 are operated independently by the operator in the operation, the linear traveling valve spool 201 is not reversed, and at this time, the first input end of the linear traveling valve is communicated with the first output end of the linear traveling valve.
In the aspect of the pilot oil path, hydraulic oil output by the pilot pump 103 passes through the left traveling pilot valve 3 to drive the left traveling valve spool 202 to be reversed, so that the input end of the left traveling valve is communicated with the output end, and hydraulic oil output by the pilot pump 103 passes through the right traveling pilot valve 4 to drive the right traveling valve spool 204 to be reversed, so that the input end of the right traveling valve is communicated with the output end.
In the aspect of the main oil path, the hydraulic oil output by the first main pump 101 provides working oil for the left traveling motor 8 through the straight traveling valve, the hydraulic oil output by the second main pump 102 provides working oil for the right traveling motor 9, at the moment, the first main pump 101 provides left-side traveling, the second main pump 102 provides right-side traveling, and traveling on two sides does not influence each other and can guarantee straight traveling.
If not, in another case, when the first boom valve and the second boom valve are operated independently, that is, when the operator operates the boom pilot valve 5 independently during operation, the linear travel spool 201 is not reversed, the second boom spool 205 is not reversed, and at this time, the second input end of the second boom valve is communicated with the output end of the second boom valve.
In the pilot oil path, the hydraulic oil output by the pilot pump 103 passes through the boom pilot valve 5 to drive the first boom spool 203 to change direction, so that the input end and the output end of the first boom valve are communicated, and the hydraulic oil output by the pilot pump 103 passes through the boom pilot valve 5 to drive the second boom spool 205 to change direction, so that the input end and the output end of the second boom valve are communicated.
In the aspect of a main oil path, hydraulic oil output by the first main pump 101 provides working oil for the boom cylinder 6 through the check valve LCb and the first boom valve, hydraulic oil output by the second main pump 102 provides working oil for the boom cylinder 6 through the check valve CP1 and the second boom valve, and at this time, the first main pump 101 and the second main pump 102 supply a boom together to lift the boom.
If so, it is confirmed as the straight traveling hoist mode, that is, the operator simultaneously operates the left traveling pilot valve 3, the right traveling pilot valve 4, and the boom pilot valve 5.
And S2, starting the linear traveling electromagnetic valve, reversing the linear traveling valve spool 201 to communicate the first input end of the linear traveling valve with the second output end of the linear traveling valve, communicating the second input end of the linear traveling valve with the first output end of the linear traveling valve, and reversing the second movable arm valve spool 205 to communicate the first input end of the second movable arm valve with the output end of the second movable arm valve.
Specifically, when the pilot pressure of the boom is increased to a set value, the straight travel spool 201 is not reversed, and at this time, the travel speed is not changed; when the boom pilot pressure continues to increase and the boom starts to move, the straight travel spool 201 is reversed. When the pilot pressure of the movable arm is reduced and the movable arm stops acting, the straight traveling valve core 201 is not reversed, and at the moment, the traveling speed is not changed; when the boom pilot pressure continues to decrease to the set value, the straight travel spool 201 is reversed. The lowest pilot pressure of the movable arm is 6.4 bar; the pilot pressure set value of the movable arm is 7 bar; when the boom starts to act, the boom pilot pressure is 11 bar. The range from the set value of the pilot pressure of the movable arm to the pilot pressure of the movable arm when the movable arm starts to act is used as an insensitive area, the linear traveling solenoid valve is not operated when the pilot pressure of the movable arm is in the insensitive area, the linear traveling valve core 201 is inconvenient to maintain in situ, and frequent reversing of the linear traveling valve core 201 is avoided, so that the frame is prevented from being frequently accelerated and decelerated, and shaking is caused.
In the aspect of the pilot oil path, hydraulic oil output by the pilot pump 103 passes through the left traveling pilot valve 3 to drive the left traveling valve spool 202 to be reversed, so that the input end of the left traveling valve is communicated with the output end, and hydraulic oil output by the pilot pump 103 passes through the right traveling pilot valve 4 to drive the right traveling valve spool 204 to be reversed, so that the input end of the right traveling valve is communicated with the output end.
The hydraulic oil output by the pilot pump 103 passes through the boom pilot valve 5 to drive the first boom spool 203 to change direction, so that the input end and the output end of the first boom valve are communicated, and the hydraulic oil output by the pilot pump 103 passes through the boom pilot valve 5 to drive the second boom spool 205 to change direction, so that the input end and the output end of the second boom valve are communicated.
In terms of a main oil path, hydraulic oil output by the first main pump 101 provides working oil for the boom cylinder 6 through the check valve LCb and the first boom valve, and in addition, hydraulic oil output by the first main pump 101 provides working oil for the boom cylinder 6 through the linear travel spool 201, the linear travel valve, and the second boom valve; the hydraulic oil output from the second main pump 102 supplies the right traveling motor 9 with the working oil, and in addition, the hydraulic oil output from the second main pump 102 supplies the left traveling motor 8 with the working oil through the straight traveling valve.
Therefore, the first main pump 101 is only responsible for the movable arm, the second main pump 102 is only responsible for left-right walking, and normal actions and walking deviation of all actions can be avoided when the three actions are operated simultaneously.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. The utility model provides an excavator, includes the frame, install main pump assembly (1), main valve assembly (2) on the frame, main pump assembly (1) includes first main pump (101), second main pump (102) and pilot pump (103), main valve assembly (2) are including straight line walking valve, left walking valve, right walking valve, first movable arm valve and second movable arm valve, its characterized in that: the frame is also provided with a linear traveling electromagnetic valve, the input end of the linear traveling electromagnetic valve is connected with the output end of the pilot pump (103), and the output end of the linear traveling electromagnetic valve is connected with the linear traveling valve core (201);
the output end of the first main pump (101) is connected with the first input end of the linear traveling valve, and the first output end of the linear traveling valve is connected with the input end of the left traveling valve;
the output end of the first main pump (101) is connected with the input end of a first movable arm valve through a one-way valve (LCb), and the second output end of the linear traveling valve is connected with the first input end of a second movable arm valve;
the output end of the second main pump (102) is connected with the input end of the right walking valve and the second input end of the linear walking valve;
the output end of the second main pump (102) is connected with the second input end of a second boom valve through a one-way valve (CP 1), and the output end of the second boom valve and the output end of the first boom valve are connected with a boom cylinder (6) through a one-way valve (CCb);
the hoisting method of the excavator comprises the following steps:
s1, judging whether the left walking, the right walking and the movable arm lifting actions are operated simultaneously, if so, confirming the straight walking hoisting mode;
s2, starting the linear traveling electromagnetic valve, reversing the linear traveling valve core (201), communicating a first input end of the linear traveling valve with a second output end of the linear traveling valve, communicating a second input end of the linear traveling valve with a first output end of the linear traveling valve, simultaneously reversing the second movable arm valve core (205), and communicating a first input end of the second movable arm valve with an output end of the second movable arm valve;
in step S2, when the boom pilot pressure is increased to a set value, the straight travel spool (201) is not reversed, and the travel speed is not changed; when the pilot pressure of the boom continues to increase and the boom starts to act, the straight traveling valve core (201) is reversed.
2. The excavator of claim 1 wherein: the linear traveling electromagnetic valve is a proportional electromagnetic valve.
3. The excavator of claim 1 wherein: and a rotary brake-releasing electromagnetic valve is also installed on the frame, the input end of the rotary brake-releasing electromagnetic valve is connected with the output end of the pilot pump (103), and the output end of the rotary brake-releasing electromagnetic valve is connected with the rotary motor (7).
4. The excavator of claim 3 wherein: the rotary brake-releasing electromagnetic valve is a two-position three-way electromagnetic valve.
5. The excavator of claim 1 wherein: in step S2, when the boom pilot pressure decreases and the boom stops operating, the straight travel valve body (201) is not reversed, and at this time, the travel speed is not changed; and when the pilot pressure of the movable arm is continuously reduced to a set value, the straight-line traveling valve core (201) is reversed.
6. The excavator of claim 5 wherein: the lowest pilot pressure of the movable arm is 6.4 bar; the pilot pressure set value of the movable arm is 7 bar; when the movable arm starts to act, the pilot pressure of the movable arm is 11 bar.
7. The excavator of claim 1 wherein: when the left walking valve and the right walking valve are independently operated, the straight walking valve core (201) is not reversed, and at the moment, the first input end of the straight walking valve is communicated with the first output end of the straight walking valve.
8. The excavator of claim 1 wherein: when the first boom valve and the second boom valve are operated independently, the second boom spool (205) is not reversed, and at the moment, the second input end of the second boom valve is communicated with the output end of the second boom valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011572875.0A CN112482482B (en) | 2020-12-28 | 2020-12-28 | Digging machine |
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|---|---|---|---|
| CN202011572875.0A CN112482482B (en) | 2020-12-28 | 2020-12-28 | Digging machine |
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| CN112482482A CN112482482A (en) | 2021-03-12 |
| CN112482482B true CN112482482B (en) | 2022-04-12 |
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| CN113126552B (en) * | 2021-05-08 | 2022-04-12 | 雷沃工程机械集团有限公司 | Intelligent crushing control method and excavator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7614225B2 (en) * | 2006-04-18 | 2009-11-10 | Volvo Construction Equipment Holding Sweden Ab | Straight traveling hydraulic circuit |
| KR100753990B1 (en) * | 2006-08-29 | 2007-08-31 | 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 | Hydraulic circuit for traveling straight |
| KR100900436B1 (en) * | 2007-05-21 | 2009-06-01 | 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 | Traveling device of heavy equipment crawler type |
| CN102605812B (en) * | 2012-03-22 | 2014-06-25 | 三一重机有限公司 | Excavator linear movement control device and excavator linear movement control method |
| CN111101553B (en) * | 2020-01-14 | 2022-02-15 | 徐州徐工矿业机械有限公司 | Electric control rotary brake release system of hydraulic excavator and use method |
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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. |