CN212896585U

CN212896585U - Converging hydraulic system of excavator bucket

Info

Publication number: CN212896585U
Application number: CN202021246160.1U
Authority: CN
Inventors: 董立队; 杨典作; 张贵贤; 于志伟; 谢印标
Original assignee: Shandong Lingong Construction Machinery Co Ltd
Current assignee: Shandong Lingong Construction Machinery Co Ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2021-04-06
Anticipated expiration: 2030-06-30

Abstract

The utility model discloses an excavator scraper bowl confluence hydraulic system, it belongs to engineering machine tool technical field. The excavator bucket confluence control device overcomes the defects that a traditional excavator bucket in the prior art is slow in action speed and low in operation efficiency when converging. The main structure of the hydraulic control system comprises a main pump PI, a main pump PII and a main control valve, wherein the main pump PI and the main pump PII are respectively connected with the main control valve, the main control valve comprises a bucket valve rod, a confluence valve is arranged between the oil outlet of the main pump PI and the oil outlet of the main pump PII, a pilot signal end Ax of the bucket valve rod is connected with an oil port A of a shuttle valve, a pilot signal end Bx is connected with an oil port B of the shuttle valve, and an oil port C of the shuttle valve is connected with a signal end PP of the confluence valve through a control electromagnetic valve. The utility model discloses mainly used engineering machine tool such as excavator is last.

Description

Converging hydraulic system of excavator bucket

The technical field is as follows:

the utility model belongs to the technical field of the engineering machine tool, specifically speaking especially relates to an excavator scraper bowl confluence hydraulic system.

Background art:

in the field of excavator application, the market and customers have made higher and higher requirements on the operating efficiency of the excavator, and excavator manufacturers are also continuously improving the operating efficiency of the excavator in terms of design.

FIG. 3 is a schematic diagram of a prior art excavator hydraulic system having two working oil pumps: main pumps P1 and P2 respectively supply oil to a left valve body and a right valve body of the main control valve, and a rotary valve rod, a multifunctional valve rod, a bucket rod valve rod and a left walking valve rod are mounted on the left valve body and respectively control the rotary, multifunctional, bucket rod and left walking; and the right valve body is provided with a movable arm valve rod, a bucket valve rod and a right walking valve rod which respectively control the movable arm, the bucket and the right walking.

In order to improve the working efficiency, a boom and arm confluence channel and a related control circuit are respectively designed in the main valve, and confluence of the main pumps P1 and P2 is realized, so that the action speed of the boom and the arm is improved, and the production efficiency is improved. However, the related channel and control circuit for bucket confluence are not designed in the main valve, and the bucket action speed and the working efficiency cannot be improved under the specific working condition that the bucket action speed needs to be improved.

The invention content is as follows:

the to-be-solved technical problem of the utility model is overcome prior art's is not enough, provides an excavator scraper bowl confluence hydraulic system, and it is through the outer confluence oil circuit of dipper valve, and main pump PI and the confluence of main pump PIII are simultaneously to the scraper bowl fuel feeding when realizing the scraper bowl action, have improved scraper bowl action speed and complete machine operating efficiency.

In order to achieve the above purpose, the utility model is realized by adopting the following technical scheme:

the utility model provides an excavator scraper bowl confluence hydraulic system, includes main pump PI, main pump PII and main control valve, and main pump PI and main pump PII are connected with the main control valve respectively, and the main control valve includes the scraper bowl valve rod, be equipped with the confluence valve between the oil-out of main pump PI and the oil-out of main pump PII, the guide signal end Ax of scraper bowl valve rod is connected with the hydraulic fluid port A of shuttle valve, and guide signal end Bx is connected with the hydraulic fluid port B of shuttle valve, and the hydraulic fluid port C of shuttle valve is connected with the signal end PP who merges the valve through the control solenoid valve.

Preferably, a throttle valve is arranged between the signal end PP of the flow merging valve and the control electromagnetic valve.

Preferably, a one-way valve is arranged between the oil outlet of the main pump PI and the flow merging valve.

Preferably, the two-position two-way valve in the main control valve is communicated with the control electromagnetic valve through a pipeline.

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

1. through the external confluence oil way of the bucket valve, the main pump PI and the main pump PIII are converged and supply oil to the bucket simultaneously when the bucket acts, so that the action speed of the bucket is increased and the operation efficiency of the whole machine is improved on the premise of not influencing other actions;

2. the utility model discloses do not change the structure of master control valve, make holistic design degree of difficulty and cost reduction, do not influence other actions of complete machine, improved scraper bowl action speed.

Description of the drawings:

FIG. 1 is a hydraulic schematic diagram of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at G;

fig. 3 is a hydraulic schematic diagram of the prior art.

In the figure: 1. a flow merging valve; 2. a one-way valve; 3. a throttle valve; 4. controlling the electromagnetic valve; 5. a shuttle valve; 6. a master control valve; 7. a bucket valve stem; 8. a main pump P I; 9. a main pump PII; 10. a pipeline; 11. two-position two-way valve.

The specific implementation mode is as follows:

the present invention will be further described with reference to the following specific embodiments and accompanying drawings.

Example 1:

as shown in fig. 1-2, an excavator bucket confluence hydraulic system comprises a main pump pii 8, a main pump pii 9 and a main control valve 6, wherein the main pump pii 8 and the main pump pii 9 are respectively connected with the main control valve 6, the main control valve 6 comprises a bucket valve rod 7, a confluence valve 1 is arranged between an oil outlet of the main pump pii 8 and an oil outlet of the main pump pii 9, a pilot signal end Ax of the bucket valve rod 7 is connected with an oil port a of a shuttle valve 5, a pilot signal end Bx is connected with an oil port B of the shuttle valve 5, and an oil port C of the shuttle valve 5 is connected with a signal end PP of the confluence valve 1 through a control solenoid valve 4.

Example 2:

a throttle valve 3 is arranged between a signal end PP of a confluence valve 1 and a control electromagnetic valve 4. And a one-way valve 2 is arranged between the oil outlet of the main pump PI 8 and the flow merging valve 1.

And a two-position two-way valve 11 in the main control valve 6 is communicated with the control electromagnetic valve 4 through a pipeline 10. The other portions are the same as in example 1.

When the bucket acts, the main pump PI 8 and the main pump PII 9 are combined and supply oil to the bucket valve rod 7 at the same time by controlling the action of the combining valve 1 through the pilot control oil of the bucket, so that the action speed of the bucket is increased. The confluence valve 1 acts to realize confluence of a main pump PII 8 and a main pump PIII 9; the check valve 2 is used for preventing oil of the main pump PII 9 from flowing to a main pump PII 8 loop when the load of the bucket rod and the bucket combined action bucket rod is light, so that the bucket action speed is reduced, and meanwhile, the normal confluence of the main pump PII 8 to the main pump PII 9 loop under other states is not influenced; the throttle valve 3 is used for reducing the impact when the bucket is closed and the unloading action is rapidly switched; the control electromagnetic valve 4 can control the on-off of the bucket pilot control oil which is led to the confluence valve 1 by acting and is used for selecting the bucket to act for confluence or non-confluence; the shuttle valve 5 is used for selecting the bucket collecting pilot oil A1 and the bucket discharging pilot oil B1, and the bucket pilot oil is led to the bucket merging control oil path when the bucket performs any action, so that merging can be realized when the bucket performs any action.

And if the working conditions need to be converged, the electromagnetic valve 4 is controlled to be electrified to act, and the oil way is communicated. The bucket collecting pilot oil A1 or the bucket discharging pilot oil B1 controls the action of a bucket valve rod 7 of the main control valve 6, acts on the flow combining valve 1 through the shuttle valve 5 and the control electromagnetic valve 4, acts on a left valve block of the main control valve 6, closes a central bypass loop and controls the output of a main pump PI 8. The confluence valve 1 acts, the main oil way is communicated, oil output by the main pump PII 8 is converged to the bucket valve rod 7 through the confluence valve 1 and the main pump PIII 9, and the bucket action speed is increased.

If the working conditions do not need to be converged, the control electromagnetic valve 4 is powered off, and the oil way is disconnected. The bucket collecting pilot oil A1 or the bucket discharging pilot oil B1 does not control the action of the confluence valve 1 and does not realize confluence.

Claims

1. The utility model provides an excavator scraper bowl confluence hydraulic system, includes main pump PI (8), main pump PII (9) and main control valve (6), and main pump PI (8) and main pump PII (9) are connected with main control valve (6) respectively, and main control valve (6) include scraper bowl valve rod (7), its characterized in that: a flow combining valve (1) is arranged between an oil outlet of the main pump PI (8) and an oil outlet of the main pump PII (9), a pilot signal end Ax of the bucket valve rod (7) is connected with an oil port A of the shuttle valve (5), a pilot signal end Bx is connected with an oil port B of the shuttle valve (5), and an oil port C of the shuttle valve (5) is connected with a signal end PP of the flow combining valve (1) through a control electromagnetic valve (4).

2. The excavator bucket converging hydraulic system of claim 1, wherein: and a throttle valve (3) is arranged between the signal end PP of the flow merging valve (1) and the control electromagnetic valve (4).

3. The excavator bucket converging hydraulic system of claim 1 or 2, wherein: and a one-way valve (2) is arranged between the oil outlet of the main pump PI (8) and the flow-merging valve (1).

4. The excavator bucket converging hydraulic system of claim 1 or 2, wherein: the two-position two-way valve (11) in the main control valve (6) is communicated with the control electromagnetic valve (4) through a pipeline (10).