SU968231A2

SU968231A2 - Twin-circuit hydraulic drive of excavator

Info

Publication number: SU968231A2
Application number: SU813260025A
Authority: SU
Inventors: Павел Борисович Панкратов; Геннадий Иванович Мартынов; Валентин Николаевич Грязнов; Владимир Алексеевич Бажанов; Михаил Михайлович Шепель; Владимир Иванович Шульгин; Владимир Яковлевич Шкловский; Владимир Кельманович Гойхбург; Владимир Владимирович Хихловский
Original assignee: Калининский Экскаваторный Завод Министерства Строительного,Дорожного И Коммунального Машиностроения Ссср
Priority date: 1981-03-16
Filing date: 1981-03-16
Publication date: 1982-10-23

Description

1one

; Изобретение относитс к строитель ;но-дОрожныМ машинам, а именно к их гидравлическому приводуv; The invention relates to the builder; but-yeast machines, namely to their hydraulic drive

По основному авт. св. If 810916 известен двухпото.чный гидравлический привод экскаватора, включающий насосы,.две сообщенные между собой группы распределителей с установленными в одной из них распределителем подъема гидроцилиндров стрелы и суммирующим распределителем, имеющим золотник с проточками, переливной канал и рабочие отводы, первый из которых соединен с входом другой группы распределителей, и гидроцилиндры подъема стрелы L1J.According to the main author. St. If 810916 a two-line hydraulic excavator drive is known, which includes pumps, two groups of distributors interconnected with one installed in one of them a boom hydraulic cylinder lift distributor and a summing distributor having a spool with grooves, an overflow channel and working taps, the first of which is connected to the input of another group of valves, and hydraulic cylinders lifting boom L1J.

Недостатком известного гидравлического привода вл етс ;то, что при включении суммирующего золотника в положение безнасосного опускани рабочего оборудовани , стрела может только опускатьс .A disadvantage of the known hydraulic drive is that when the summing spool is turned to the pumping lowering position of the working equipment, the boom can only be lowered.

;1л осуществлени планировочных, работ необходимо дать возможность; 1l planning, work must be given the opportunity

стреле как опускатьс , так и подниматьс , т.е. необходимо одновременно сообщить и поршневые и штоковые полости гидроцилиндров стрелы со сливом .the boom is both lowered and raised, i.e. It is necessary to simultaneously report both piston and rod cavities of the hydraulic cylinders of the boom with a drain.

Целью изобретени вл етс расширение технологических возможностей.The aim of the invention is the expansion of technological capabilities.

Поставленна цель достигаетс тем, что гидропривод снабжен обратным управл емым клапаном, соединенным со10 ответственно со штоковыми полост ми гидроцилиндров стрелы и сливом, а гидролини управлени обратным управл емым клапаном сообщена с гидролинией управлени суммирующим распредеIS лителем.The goal is achieved by the fact that the hydraulic actuator is equipped with a return controlled valve connected respectively with the rod cavities of the boom hydraulic cylinders and the drain, and the control hydroline of the reverse controlled valve communicates with the hydraulic control of the summation distributor.

На чертеже изображена- гидравлическа принципиальна схема привода.The drawing shows a hydraulic drive diagram.

Гидравлический привод состоит из насосов 1 и 2, питаюи1их группы 3 и The hydraulic drive consists of pumps 1 and 2, powered by group 3 and

Claims

20 . control valves. The distributor group 5 includes the distributor 5, which controls the boom lift hydraulic cylinders 6. The groups 3 and the control distributors are interconnected by hydraulic line 7 so that the outlet of the overflow channel of the distributor group 3 is connected to the inlet of the distributor group. The distributor 8 is communicated through the outlet 9 and the pipeline 10 with the water inlet of group 3, and the other working outlet 11 and the pipeline. 12 Post piston cavities of hydraulic cylinders 6 boom. The working taps 9 and 11 of the distributors 8 are equipped with make-up valves 13 and 14. On the hydraulic line 15 communicating the rod cavities of the hydraulic cylinders 6 booms with the tank 16, a check valve 17 which controls the rod cavities is installed, the hydraulic valve 18 controlling the check valve 17 is connected to the hydro line 19, control of switching on summation distributor В в. the position of the boomless pumping-down boom. When the valves 5 and 8 are in the neutral position, their outlets are shut off, and the working fluid coming from the pumps through the overflow channel is drained into the tank 16. When the distributor 5 is turned on (up position), the working fluid from the pump It goes into one of the working taps and further into the piston cavities of the hydraulic cylinders 6 of the boom, and from their rod stocks through another working branch of the distributor 5 is directed to the tank. This inclusion of the distributor 5 corresponds to the boom lift. When the distributor 5 is turned on (down), the boom is forced (forced) to lower. When the distributor 8 is turned on to the pumpless lowering position of the boom (downward position), the overflow channel remains open, the working outlet 11 communicates with the drain piping 20, and the working outlet 9 is disconnected from the pressure channel 21 of the hydraulic distributor. At the same time, the pressure on the hydroline 18 from the servo-control system of the spools opens the check valve 17, and the rod cavities of the hydraulic cylinders 6 of the boom are also connected to the drain (tank), i.e. The boom is in a floating position and, depending on the movement of the arm (or the bucket), can either be lowered by the weight of the working equipment or raised from the effect of the soil reaction force on the bucket. The economy from the use of the proposed hydraulic drive consists in the exclusion of a separate additional hydraulic distributor for turning the hydraulic cylinders into the float position. Claims of the invention Two-way hydraulic drive of an excavator according to the author. St. No. 810916, characterized in that, in order to expand the technological capabilities, it is provided with a check valve, connected respectively to the rod cavities of the boom hydraulic cylinders and a drain, and the control valve of the check valve is communicated with the control line of the totalizer distributor. Sources of information taken into account during the examination 1. USSR author's certificate N 810916, cl. I: 02 F 9/22, 1980 (PROTOTYPE) ..