SU1328448A1 - Dragline walking gear - Google Patents

Abstract

The invention relates to excavator stepping mechanisms, simplifies the design of highways for the supply of oil, extends the time between repairs and improves the operating conditions. The hydraulic cylinder of the stepping mechanism includes the housing (k) 1, made in one piece with the rod 3, piston 2. In the bore of the rod 3, forming an additional cylinder, there is an additional piston 8, made in one piece with ff TH (L

Description

rod 9. Rod 3 is connected to the ski 7 spherical hinge. To start skiing 7 and lift the excavator, the working fluid under pressure is fed through the opening D to the piston cavity (PP) AK 1 and through channel B in the PP B of the auxiliary cylinder. Rod cavities D and K are connected with a drain. The rod 3 is advanced, lowering the ski 7, and the rod 9 due to the pressure of the runway

one

The invention relates to excavator pitch mechanisms, and more specifically to hydraulically pushed mechanisms.

The purpose of the invention is to simplify the construction of highways for the approach of oil, increase the time between repairs, and improve conditions.

Figure 1 shows a diagram of the mechanism of walking; figure 2 - cylinder with retracted position of the rods.

The stepping mechanism includes a housing 1, a piston 2, made in one piece with the rod 3, a guide sleeve 4 and a flange 5. The rod 3 is connected with a ski 7 by means of a spherical hinge 6, In the bore of the rod 3 forming an additional cylinder, an additional a piston 8 made in one piece with the rod 9 directed towards the cavity A of the housing and passing through the guide sleeve 10, which is fixed from longitudinal movements by means of a composite retaining ring

11 installed in the annular groove of the rod 3 and held by the washer

12, The rod 9 is freely supported on the bottom of the body 1 cylinder.

The piston cavity A in housing 1 is connected by a channel B with a piston cavity B in the stem 3 and a hole G with a pressure line. The rod cavity D of the housing is connected by a hole E with the pressure line and the channel F with the rod cavity K in the rod 3.

Fur} shzm works as follows

presses to the deaf bottom K 1, for the return stroke, i.e. ski lift 7, PP A and B are connected to the drain, and rod cavities D and K through the channel E are connected to the pressure line. To speed up the lifting of the piston 2 and the ski 7 in the channel J, which connects the rod cavities D and K, a check valve can be installed. 1 h. ffl, 2 il ..

To lower the ski 7 and lift the excavator, the working fluid under pressure passes through the opening D to the piston cavity A of the housing and then through channel B to the piston cavity B of the additional cylinder in the rod. 3. In this case, the cavities D and K are connected with a drain. Under the action of the pressure of the working fluid, the rod 3 extends, lowering the ski 7, and the rod 9 due to the pressure in cavity B presses against the deaf bottom of the housing 1. In this case, the force developed by the hydraulic cylinder is equal to

, -S2) - PSj P (S, + -5z -S),

where P is the pressure of the working fluid;

S is the area of the piston 2;

Sj is the end area of the rod;

Sj - the area of the piston 8,

those. the additional force is equal to the product of the working fluid pressure by the area (5 i) i.e. on the cross-sectional area of the rod cavity K,

For reverse, i.e. ski lift, piston cavities A and B are connected with a drain, and rod cavities D and K through channel E are connected to the Pressure line. When the working fluid is supplied through the channel E, the piston 8 moves to the lower position against the stop in the blank bottom of the rod 3. With a further increase in the pressure of the working fluid, the piston 2 moves upwards with the rod, ensuring the ski lift.

In channel G, connecting rod cavities, a check valve 13 can be installed, which opens into the rod cavity D of the housing. Then when lifting a ski rod stock cavity

It does not fill with working fluid (a vacuum is formed in it) and only a small amount of working fluid enters it due to leakage through the seal and the check valve, which is forced out through the latter during the course of the piston 8 upwards. In this case, due to filling one rod cavity D The rise of Porsch 2 and Skis 7 is increased. Increasing the pressure on the rise of a ski at the same time will make it possible to more fully utilize the power of the pump.

To extend the ski 7, the working fluid from pumping units 20 through check valves 14, distributor 15 (included), non-return valve 16, hydraulic spigots 17 are fed into the piston cavity of the auxiliary cylinder 18. From the rod end of the cylinder 18, liquid through hydraulic spigots 17, distributor 15 The hydraulic hinges 17 also enter the piston cavity of the auxiliary cylinder 18, increasing the speed of the ski extension, and through the distributor 19 (pos. b) - into the rod cavity of the lifting cylinder, keeping the ski in a raised position.

After the ski extends, the position I of the distributor 15, the compartment of the auxiliary cylinder from pressure and discharge, and the position of the distributor 19 are turned on. B into the piston cavity B of the additional cylinder in the rod 3, the ski is lowered to the ground and then the excavator is raised. In this case, the cavities D and K are connected via hydraulic splines 24, the throttle 21, which ensures smooth lowering of the skis, the distributor 19 with the drain. Under the action of fluid pressure, the rod 3 is moved, lifting the excavator as well. the rod 9, by virtue of the pressure in cavity B, is pressed against the deaf bottom of the housing 1, providing an additional lifting force.

After lifting the excavator, the pos. B of the distributor 15 and the pos. Of the distributor 19, the cavity compartment of the lifting cylinder from the pressure and

28448

plum. Fluid comes from pumping units 20 through check valves 14, valve 15 (position b), hydraulic joints 17 to the rod end of the auxiliary cylinder 18, and from the piston through hydraulic joints 17, throttle 22, which ensures smooth movement of the excavator, distributor 15 to drain The excavator is moving and landing on the ground ..

After the end of the movement, the pos. B of the distributor 15 remains

15 is turned on, ensuring that the piston is pressed against the bottom of the auxiliary cylinder 18, pos. O. distributor 19 and fluid from pumping units 20 through a check valve 14,

20, a valve 19 (pos. C), a check valve 23 is supplied to the rod cavities D and K through channel E, and the piston cavities A and B through hydraulic joints 24, the valve 19 are connected to

25 plums. There is a lift of skis. As the excavator moves further, the cycles are repeated.

Claims (2)

1. The excavator stepping mechanism comprising a cylinder body, a piston with a rod having a boring, forming an additional cylinder, in which an additional piston with a rod is placed. Directed in the direction of the piston cavity of the housing and passing through the guide sleeve, closing the rod bore, ski and driving with highways, characterized in that, in order to simplify the design, increase the overhaul time and improve the operating conditions, the ski is articulated with an additional cylinder , and the rod and piston cavities of the cylinder are directly interconnected, while the additional cylinder rod is freely supported on the bottom of the cylinder body. 2. The mechanism according to claim 1, of which the valve connecting the cavity of the cavity has a check valve, which is located with the possibility of opening into the rod cavity of the housing 35 45 50 55 cylinder. -6 Editor N.Shupla Compiled by V. Prokofiev Tehred I. Veres Order 3459/32 Circulation 606 Subscription VNIIPI USSR State Committee for inventions and discoveries P3035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 Proofreader V.Girn to