Two-line hydraulic drive of bucket excavator

FIELD: building.

SUBSTANCE: invention concerns open pit, building, road and loading machines, in particular bucket excavators. The two-line hydraulic drive of a bucket excavator includes two pumps connected with flowing channels of the multi spool-type hydro distributor, directed towards each other, including the monoblock case and sliding valves of hydraulic engines management of working bodies, the return and bypass relief valves, pressure-tight and drain hydro lines. There are mortises in the hydro distributor case with bushes for placing sliding valves established inside, having channels, crosspieces arranged therebetween and apertures. There are borings executed in case mortises which length is equal to the total length of three central channels and two crosspieces between them.

EFFECT: reduction of dimensions of the hydro distributor case, metal consumption reduction, decreased labour iousness, improvement of functionality due to reduction of resistance of a liquid stream.

5 dwg

 

The invention relates to mining, construction, road and loading machines, in particular to shovel.

Known hydraulic shovel excavator, comprising two pumps, a sectional valve, the valves control the hydraulic motors of the working bodies, return and safety-makeup valves, pressure, flow and drain hydroline [1].

The shortcoming of the sectional valve used in the hydraulic drive is the need to use multiple seals between the sections, which leads to the formation of the leak.

Known hydraulic shovel excavator, comprising two pumps, a valve containing monoblock cast body, valve control actuators of the working bodies, return and safety-makeup valves, pressure, flow and drain hydroline [2].

This construction of the body of the valve is sealed, but the production of a molded body with such a complex configuration of internal channels time-consuming and leads to significant losses due to rejects. In addition, the molded body can withstand less pressure, this requires increasing the thickness of the casing wall, which leads to increased size and weight.

The closest in technical essence I which is selected as a prototype double-flow hydraulic shovel excavator, includes two pump associated with aimed towards each other flow channels mnogopoloskovogo of the valve, including a one piece body and valve control actuators of the working bodies, return and safety-makeup valves, pressure and drain the hydroline [3].

The disadvantage of this design is that this design requires the use of 11 channels, which leads to an increase of the size of the body, and increase the complexity of the manufacturing process, reducing its functionality due to the large length of the channels.

The technical result of the invention is to reduce the size of the body of the valve, reducing the metal, reducing the complexity of the manufacturing process, improve the functionality by reducing the resistance to flow of liquid.

This technical result is achieved by the double-flow hydraulic actuator shovel excavator, containing two pumps associated with aimed towards each other flow channels mnogopoloskovogo of the valve, comprising a casing, a valve control actuators of the working bodies, return and safety-makeup valves, pressure and drain the hydroline, and in the body of the valve is made of the nest, in which are mounted bushings for storage the Oia spools, with canals, bridges between them and the holes in the sockets of the case is made of the bore, the length L which is equal to the total length of the three Central channels of the sleeves L1, L2, L3 and two jumpers between L4 and L5.

Application in the nests of housing of valve bores, the length of which is equal to the total length of the three Central channels of the sleeve and two bridges between them, allows to reduce the number of channels up to 7 without the use of injection molding technology and sectionsthe in the manufacture of the valve.

The design of the valve has the capability of snapping additional spools for additional hydraulic motors, such as hydraulic hammer, without changing the design of the valve.

1 shows the hydraulic circuit diagram of a two-line hydraulic shovel excavator, figure 2 - General view of the valve, figure 3 - section e-E (2) spools of one flow-through channel, 4 - section d-D (2) spools of the other flow channel 5 is a section through one of the sleeves.

Double-flow hydraulic shovel excavator consists of two pumps 1 and 2 (figure 1), the pressure hydroline 3 and 4 which are connected with directed towards each other flow channels 5 and 6 mnogopoloskovogo of the valve 7, providing a counter dvizeniektemu working fluid. Spools 8-15 control actuators of the working bodies mnogopoloskovogo the valve 7 is connected by a hose with hydraulic motors business operations, namely: hydroline 16 is connected with the piston cavity of the hydraulic movement of the bucket 17, and hydroline 18 is connected with the rod cavity of the hydraulic movement of the bucket 17, hydroline 19 is connected with the rod cavity of the hydraulic movement of the boom 20, and hydroline 21 is connected with the piston cavity of the hydraulic movement of the boom 20, hydroline 22 is connected with the piston cavity of the hydraulic movement of the handle 23, and hydroline 24 is connected with the rod cavity of the hydraulic movement of the handle 23, hydroline 25-26 connected to the hydraulic motor turn right 27, hydroline 28-29 associated with hydraulic turn left 30, hydroline 31-32 connected to the hydraulic motor of the rotation mechanism of the platform 33.

Mnogozachatkovye valve 7 is connected the drain hose 34-38 with the tank 39. Spools 8, 9, 10, 13, 14, 15 equipped with check valves 40-45. The hydroline 3, 4, 16, 18, 19, 21, 22, 24-26, 28, 29, 31, 32 is equipped with a safety-make-up valves 46-59.

In the body of the valve 7 (Fig 3 and 4) made nests 60-67, in which are mounted bushings 68-75 to accommodate spools 8-15 with channels 76-82 (figure 5) jumper 83-88 between them and the holes 89-91. In the nests 61-63 and 65-67 of the case is made of bore 92, length L (figure 5) which is equal to the total length L1, L2, L3 of the three Central channels 77, 78, 79 of the sleeves and the length L4, L5 two jumpers 85, 86 between them.

Holes 89 and 90 in the sleeve 68-75 intended for communication with the pressure line and the holes 91 are designed to cut-off fluid flow from the subsequent spools, i.e. from the actuators, and the last in the flow direction of the valve hole is communicated directly with the sink.

Double-flow hydraulic actuator operates as follows.

In the neutral position spools working fluid from the pump 1 (figure 1, figure 5) on the pressure line 3, the flow channel 5, the bores in the slots 92, the holes 89, 90, 91 in the sleeve, having opened in the neutral position spools control a flow channel, through the drain hydroline 38 flows into the tank 39. Similarly, from the pump 2 through the pressure hydroline 4, the flow channel 6, the bores in the slots 92, the holes 89, 90, 91 in the sleeve and the drain hose 35-38 - enters the tank 39.

When one of the spools, in addition to the spool 9 in any position one of the flow channels 5 or 6 of this valve is blocked and the working fluid is cut off from subsequent spools and flows through the check valve in the valve in the appropriate hydroline hydraulic. On the second hydroline this hydro is vegetale working fluid drained through the included spool control in the tank.

For example, when the switching valve control 8 in the left position of the flow channel 5 this valve is blocked and the working fluid is cut off from subsequent spools and flows through the check valve 40 in the spool on the hydroline 16 enters the piston cavity of the hydraulic movement of the bucket 17. On the hydroline 18 working fluid from the actuator is drained by the drain hose 35-38 in the tank 39.

When you enable spools control 10 and 14 of the hydraulic control handle 23, for example, the left flow channels 5 and 6 these valve overlap and the working fluid is cut off from subsequent spools and flows through the check valves 42, 44 on the hydroline 22 in the piston cavity of the hydraulic movement of the handle 23. On the hydroline 24 working fluid from the rod ends of the actuators moving the handle 23 flows through the drain hose 34-38 in the tank 39.

When the actuators move the boom 20 and the handle 23 includes a spool control 9, 10, 13 and 14. The spool control 9 overlaps with the flow channel 5 when turning to the right (lifting) and the working fluid is cut off, the flow of the working fluid will not reach the valve 10. The valve control 14 will block the flow channel 6 and the working fluid is cut off, the flow of the working fluid will not reach the valve 13. Thus, eradicating rotation of the boom 20 will work on the flow channel 5, while the actuator is moving the handle 23 will work on the flow channel 6. This ensures the independence of the two movements without the use of additional locking devices.

When you enable multiple spools of the control at the same time, work will involve only those spools controls that are on the first flow channels 5 and 6.

When switching valve 9 to the left of the hydraulic movement of the boom spool doesn't cut off the flow channel 5 and does not trim the subsequent slides. This position of the valve provides beznadejnoe lowering of the boom, which allows to obtain three independent movements in any combination with it.

Sources of information

1. Excavator swing shovel universal hydraulic crawler EA-4125. Technical description and operating instructions TO Westergeest, ed. No. M VTI SAC, p.42, 43.

2. Directory MANNESMANN REXROT Mobile Hydralic Components. 10. Hydraulic Programme Volume RE 64001/1083 (section Q3, p.3), str.507.

3. RF patent №2232225, publ. 10.07.2004, bull. No. 19.

Double-flow hydraulic shovel excavator, comprising two pump associated with aimed towards each other flow channels mnogopoloskovogo of the valve, including a one piece body and valve control actuators of the working bodies, britnie and safety-make-up valves, the pressure and drain the hydroline, characterized in that the valve body is made of the nest, in which are mounted bushings to accommodate spools, with canals, bridges between them and the holes and slots of the case is made of the bore, the length of which is equal to the total length of the three Central channels and bridges between them.



 

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