SU1209780A1 - Excavator - Google Patents

Description

2. An excavator according to claim 1, in which the rotational drive of the k-abina is made in the form of power cylinders and the rack which is mounted to the rod of the gear rack, which is mounted with the ability to interact with the supporting ring mounted on the cab a turntable by means of a gear ring mounted on it, and the platform rotational drive is made in the form of a hydraulic motor, the pressure cavities of which are communicated with the piston cavities of the power cylinders by means of reducing valves

1209780

3. Excavated by pi. 1 and 2, characterized in that it is equipped with hydraulic dampers and an additional toothed rack mounted on a turntable, the additional toothed rack is installed with the ability to interact with the toothed crown.1M of the ring fixed to the cockpit, and the dampers are communicated between a check valve and make-up tank.

The invention relates to earthmoving machinery, in particular to excavators with a turntable and an operator cab mounted on it.

The purpose of the invention is to reduce the dynamic loads acting on the operator when the platform is rotated. FIG. 1 shows an excavator in the initial position, a general view; in fig. 2 shows the relative position of the control cabin and the platform after the rotation of the latter, in FIG. 3 is a kinematic diagram of the control cab turning mechanism; in fig. 4 is a view A of FIG. 1, partial section; in fig. 5 is a hydraulic diagram of the mechanism for turning the control cabin.

The excavator contains the base chassis 1, the turntable 2, on which the boom 3 is installed with working equipment, the control cabin 4, the bottom of which is rigidly connected to the support ring 5 equipped with the gear crown 6. The lower part of the ring 5 is supported through the rolling bearing 7 on the support ring 8, rigidly connected to the turntable 2. The ring gear 6 with its teeth is kinematically connected with the gear rack 9 attached to the hydraulic rods of cylinders 10 and 11, which are fixed to the hydraulic cylinder rods through brackets 12 and 13 in 10 and 11, which, through the brackets 12 and 13, are attached to the rotary platform 2. The cylinders 10 and 11 are hydraulic, and the dampers communicate with each other by a check valve and a make-up tank.

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15

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five

D

The ki are connected through reducer valves 14 and 15 and throttling elements: a tape 16 and 17 with check valves with a hydraulic motor 19 of a turntable 2.

On the other hand, the ring gear 6 is kinematically connected with its teeth through the rail 19 with adjustable lugs 20 and 21, which have the ability, in the final positions of rotation of the control cabin, to interact with the damper rods 22 and 23, which are communicated by the makeup tank 24 and the check valve 25,

The excavator works as follows

To rotate the rotary platform 2 of the excavator from the initial position shown in FIG. 1 to the position shown in FIG. 2, the operator turns on the working fluid to the hydraulic motor 18 and simultaneously NieHHo through the throttling element 16 and the reducing valve 14 to the piston cavity of the cylinder 10. Under the action of the working fluid, the hydraulic motor 18 rotates the turntable 2 to the right side (Fig. 2). When the volume is hydraulic, 10 and 11 move with the turntable 2 and the rail. 9 rolls its teeth around the toothed ring b.

Under the action of the working fluid in the piston-: the ev cavity of the cylinder 10, the rail 9 alternates, turning

a ring 5, provided with a ring gear 6, and a cab 4 rigidly connected with the ring in the opposite direction of rotation of the turntable 2. The angle of rotation of the control cabin 4 is limited by adjustable stops 20 and 21 screwed into the rail 19, In this case the stop 20 abuts the rod the damper 22 and the latter inhibits the movement of rotation of the cab 4 of the control to a complete stop by moving fluid from the piston cavity of the damper 22 through a closed pipeline to the damper 23.

When returning the rotary platform 2 to its original position and further to the left side (in Fig. D), the operator turns on the supply of working fluid to the reverse stroke of the hydraulic motor 18 and simultaneously through the throttling element 17 and the reducing valve 15 to the piston cavity of the cylinder 11. Under the action of the working fluid the hydraulic motor : 18 rotates the turntable 2 to the left side (in FIG. 1), i.e. in the initial initial position. In this case, the hydraulic cylinders 10 and 11 move together with the turntable 2, and the rail runs around its teeth on the gear ring 6.

Under the action of the working fluid in the piston cavity of the cylinder 11, the rail 9 also moves its teeth 2097804

MI acts on the teeth of the ring gear 6, while turning the ring gear 6 with the ring 5 and the cab 4 management. When this piston cavity

5 of the power cylinder 10 is switched to discharge the working fluid into the system to drain. The rotation of the control cabin 4 in this case is limited by the adjustable stop 21, which rests 10 s into the damper rod 23, and the latter inhibits the movement of the rotation of the cabin 4 until it stops completely by moving the fluid from the piston cavity of the damper 23 to the damper 22.

) 5 The rotation of the turntable 2 from the left to the right position (in Fig. 1) is performed in this way. The speed of rotation of the cockpit 4 controls is regulated by a pressure reducing valve.

20 and 14 and 15 and throttling elements 16 and 17. Feeding dampers 22. and 23 from the closed pipeline is produced through a check valve 25 from the tank 24.

Compared to the base object, turning the cab relative to the platform reduces the absolute rotation of the cab relative to the chassis, which reduces operator fatigue, provides a sufficient overview of the working equipment and the front of work and improves the performance of the excavator due to the possibility of increasing the speed of rotation of the platform.

FIG. 2

13

Editor A. Kozoriz

Order 478/37 Circulation 642Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, -Moscow, Zh-35, 4/5 Raushsk nab.

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Branch PPP Patent, Uzhgorod, Proektna St., 4

5 II

Compiled by I.Sinitska

Tehred L.Mikesh Proofreader A.Zimokosov

Claims (3)

1. EXCAVATOR, comprising a rotary platform with working equipment and a cab and a platform rotation drive, characterized in that, in order to reduce the dynamic loads acting on the operator when the platform is rotated, it is equipped with an additional support-rotary circle, the support rings of which are connected to the cab and a turntable, and a cab rotation drive coupled to an additional slewing ring mounted on the cab and a platform rotation drive. FIG. 1 2. An excavator according to Claim. Characterized in that the cab rotation drive is made in the form of power cylinders and a gear rack connected to their rods, which is installed with the possibility of interaction with the support ring mounted on the cab of the additional support-rotary circle by means of a gear rim made on it, and the platform rotation drive is made in the form of a hydraulic motor, the pressure cavities of which are in communication with the piston cavities of the power cylinders by means of pressure reducing valves 3. Excavator 1 and 2, characterized in that it is equipped with hydraulic dampers and an additional gear rack mounted on a rotary platform, while the additional gear rack is installed with the possibility interactions with the toothed rim of the additional support-rotary circle fixed to the cockpit ring, and the dampers are interconnected by a check valve and a make-up tank.