CN202577399U

CN202577399U - Movable arm lifting priority control system in medium-sized hydraulic excavator negative flow system

Info

Publication number: CN202577399U
Application number: CN 201220231898
Authority: CN
Inventors: 胡韬; 杨俊林; 吴兴忠
Original assignee: RONGSHENG MACHINERY CO Ltd
Current assignee: RONGSHENG MACHINERY CO Ltd
Priority date: 2012-05-22
Filing date: 2012-05-22
Publication date: 2012-12-05
Anticipated expiration: 2022-05-22

Abstract

The utility model discloses a movable arm lifting priority control system in a medium-sized hydraulic excavator negative flow system. The movable arm lifting priority control system is characterized in that two-position two-way hydraulic control reversing valves of each oil inlet path are respectively arranged on the oil inlet path of a bucket rod confluence valve core and the oil inlet path of a revolving valve core; flow distribution of a movable arm oil cylinder and a bucket rod oil cylinder is adjusted by throttling of the two-position two-way hydraulic control reversing valves when an movable arm is lifted and a bucket rod is in composite actions, and the flow distribution of the movable arm oil cylinder and a revolving motor is adjusted by throttling of the two-position two-way hydraulic control reversing valves when the movable arm is in the composite actions of lifting and revolving. By utilizing the movable arm lifting priority control system, when an excavator is in normal work, the flow distribution is more reasonable when the movable arm is lifted and the bucket rod is in the composite actions as well as when the movable arm is in the composite actions of lifting and revolving, and the work efficiency is higher.

Description

Swing arm promotes priority control system in the medium-sized hydraulic crawler excavator minus flow system

Technical field

The utility model relates to medium-sized excavator minus flow and controls system, a kind of control mode that improves the hydraulic crawler excavator operating efficiency of saying so more specifically.

Background technology

Hydraulic crawler excavator is mainly used in excavation and unloads soil, and in this process, the speed that swing arm promotes will influence excavates the circulation timei of unloading soil, and then influences the operating efficiency of excavator.During present medium-sized excavator minus flow system composite move, assignment of traffic because assignment of traffic is reasonable inadequately, has influenced the operating efficiency of excavator by main valve plug opening degree and load decision.

Summary of the invention

The utility model is for avoiding above-mentioned existing in prior technology weak point; Provide that swing arm promotes priority control system in a kind of medium-sized hydraulic crawler excavator minus flow system; Make excavator when operate as normal; It is more reasonable with rotating composite move assignment of traffic that swing arm promotes with composite move, the swing arm lifting of dipper, and operating efficiency is higher.

The utility model adopts following technical scheme for the technical solution problem:

Swing arm promotes the design feature of priority control system and is in the medium-sized hydraulic crawler excavator minus flow of the utility model system: at the two-position two-way hydraulic control reversal valve that is provided with respectively on the in-line of dipper converging valve core and the in-line at rotary valve key on the in-line separately; The boom cylinder and the assignment of traffic of bucket arm cylinder when the throttling through said two-position two-way hydraulic control reversal valve is regulated swing arm and promoted with the dipper composite move, and regulate the assignment of traffic that swing arm promotes boom cylinder and rotary motor when turning round composite move.

The design feature of swing arm lifting priority control system also is in the medium-sized hydraulic crawler excavator minus flow of the utility model system:

Two-position two-way hydraulic control reversal valve A is set on the in-line of No. two spools of dipper; The reversal valve A pilot port of said two-position two-way hydraulic control reversal valve A is connected with the control mouth of swing arm guide joystick, and the drain tap end of said two-position two-way hydraulic control reversal valve A is connected with hydraulic oil container;

Two-position two-way hydraulic control reversal valve B is set on the in-line of rotary valve key; The reversal valve B pilot port of said two-position two-way hydraulic control reversal valve B is connected with the control mouth of swing arm guide joystick, said two-position two-way hydraulic control reversal valve B the drain tap end be connected with hydraulic oil container.

Compared with present technology, the utility model beneficial effect is embodied in:

The adjusting control of the utility model through the bi-bit bi-pass reversal valve, assignment of traffic is more rationally when making swing arm promote the composite move with dipper, action more coordinates, the swing arm hoisting velocity is accelerated; Assignment of traffic is more reasonable when also making swing arm lifting and rotating composite move, action is more coordinated, the quickening of swing arm hoisting velocity, has realized the goal of the invention of the operating efficiency of raising digging machine.

Description of drawings

Fig. 1 is that swing arm promotes and dipper composite move sketch map in the utility model;

Fig. 2 is that swing arm promotes and revolution composite move sketch map in the utility model;

Label among the figure: 1 first pump; 2 second pumps; 3 dipper guide joysticks; 4 swing arm guide joysticks; No. two spools of 5 swing arms; Spool of 6 swing arms; Spool of 7 dippers; No. two spools of 8 dippers; 9 two-position two-way hydraulic control reversal valve A; 10 bucket arm cylinders; 11 boom cylinders; 12 rotary motors; 13 revolution guide joysticks; 14 two-position two-way hydraulic control reversal valve B; 15 rotary valve keys.

The specific embodiment

Referring to Fig. 1; Two-position two-way hydraulic control reversal valve A 9 is set on the in-line of No. two spools 8 of dipper; The reversal valve A pilot port e of two-position two-way hydraulic control reversal valve A 9 is connected with the control mouth c of swing arm guide joystick 4, two-position two-way hydraulic control reversal valve A 9 the drain tap end be connected with hydraulic oil container.

When swing arm promotes with the dipper composite move; The control mouth c guide oil of swing arm guide joystick 4 promotes bi-bit bi-pass reversal valve A switching-over, and this moment, bi-bit bi-pass reversal valve A was in throttle position, and the flow that second pump 2 is supplied with No. two spools 8 of dipper reduces because of throttling; The flow of supplying with a spool 6 of swing arm increases relatively; The hoisting velocity of swing arm is also accelerated accordingly, and the operating efficiency of digging machine also improves thereupon, swing arm is promoted with the composite move of dipper coordinate; First pump 1 among Fig. 1, dipper guide joystick 3; No. two spools 5 of swing arm; Spool 7 of dipper; Bucket arm cylinder 10 and boom cylinder 11 are all by the routine setting.

Referring to Fig. 2; Two-position two-way hydraulic control reversal valve B 14 is set on the in-line of rotary valve key 15; The reversal valve B pilot port e of two-position two-way hydraulic control reversal valve B 14 is connected with the control mouth c of swing arm guide joystick 4, two-position two-way hydraulic control reversal valve B 14 the drain tap end be connected with hydraulic oil container.

When swing arm promotes with the revolution composite move; The guide oil of two-position two-way hydraulic control reversal valve B 14 origin robot arm guide joysticks 4 promotes to commutate; Have throttling at the in-line of rotary valve key 15 this moment, and then first pump 1 flow that offers rotary motor 12 will reduce relatively, and the flow that first pump 1 offers swing arm will increase relatively; The speed that swing arm promotes also can be accelerated together accordingly, and revolution guide joystick 13 is by the routine setting.

Claims

1. swing arm promotes priority control system in the medium-sized hydraulic crawler excavator minus flow system; It is characterized in that: at the two-position two-way hydraulic control reversal valve that is provided with respectively on the in-line of dipper converging valve core and the in-line on the in-line separately at rotary valve key; The boom cylinder and the assignment of traffic of bucket arm cylinder when the throttling through said two-position two-way hydraulic control reversal valve is regulated swing arm and promoted with the dipper composite move, and regulate the assignment of traffic that swing arm promotes boom cylinder and rotary motor when turning round composite move.

2. swing arm promotes priority control system in the medium-sized hydraulic crawler excavator minus flow according to claim 1 system, it is characterized in that:

Two-position two-way hydraulic control reversal valve A (9) is set on the in-line of No. two spools of dipper (8); The reversal valve A pilot port (e) of said two-position two-way hydraulic control reversal valve A (9) is connected with the control mouth (c) of swing arm guide joystick (4), and the drain tap end of said two-position two-way hydraulic control reversal valve A (9) is connected with hydraulic oil container;

Two-position two-way hydraulic control reversal valve B (6) is set on the in-line of rotary valve key (5); The reversal valve B pilot port (e) of said two-position two-way hydraulic control reversal valve B (6) is connected with the control mouth (c) of swing arm guide joystick (4), said two-position two-way hydraulic control reversal valve B (6) the drain tap end be connected with hydraulic oil container.