SU998665A1 - Earth-moving machine - Google Patents

Description

(54) DIGGING MACHINE

one

The invention relates to earthmoving machines, and more specifically to a device for protecting mechanical transmission assemblies from breakdowns when lifting the working bodies of the active action.

A well-known digging machine, including a self-propelled chassis with power transmission, gearbox selection gearbox, a drive shaft of the working body drive and the working body 1.

However, the machine does not have a safety device to protect the rotating cardan shaft from damage when lifting the working body.

Also known is a digging machine that includes a self-propelled chassis with a power take-off control lever and a power take-off reducer with a turn-on lever, a working member mounted on a pivoting frame, a drive shaft of a drive of the operating member and a safety device containing an adjustable stop fixed to the chassis, and a limit switch mounted on a rotating frame with the possibility of interaction with the stop 2.

When you turn the working body above the permissible angle of inclination, the limit switch gives a light signal by which the machinist turns off the rotation of the drive shaft of the working body drive, which is not reliable enough.

The purpose of the invention is to increase reliability by automatically protecting the cardan shaft from damage when turning the working body.

This goal is achieved by the fact that in an earthmoving machine that includes a self-propelled chassis with a power take-off control lever and a power drive with a gear lever, a working body mounted on a rotating frame, a propeller drive shaft of a working body and a safety mechanism containing an adjustable 15 stop, mounted on the chassis, and a koyenyy switch mounted on the rotary frame with the ability to interact with the stop, the safety mechanism is made in the form of a two-link rod, the links of which are connected by pneumatic cylinder, the control valve of which is electrically connected to the limit switch, and the free ends of the rod are connected to the control levers for selection of the bleed gear and the activation of the power take-off gearbox, while the lever

switching on the power take-off gearbox is installed so that it can be turned off by means of a spring.

FIG. 1 shows a earth moving machine with a safety device; in fig. 2 - diagram of the safety mechanism; in fig. 3 is the same, node I in FIG. one.

The machine contains a self-propelled chassis 1, on which a pivot frame 2 with a working body 3 mounted on it is pivotally fixed. The self-propelled chassis contains a transmission with a power take-off gear 4, from which rotation is transmitted to the work body 3 via a drive shaft 5. 6 is controlled by means of a two-link yoke 7 and 8, for example, connected to a pneumatic cylinder 9 and a switching lever 10, fixed in the off position by an extension spring 11. On the rotary frame 2 there is a limit switch 12, the roller of which interacts with the working surface of the adjustable stop 13 fixed on the self-propelled chassis 1. The position of the working surface of the stop 13 limited by the angle l is adjusted so that the angle A formed by the distortion of the cardan shaft 5 the allowable positions of the deepening (a) and the deepening (b) of the working body 3 were equal to the rotation angle ot of the limit switch 12. The limit switch 12 is electrically connected to the crane 14 controlling the operation of the pneumatic cylinder 9.

The machine works as follows.

When the frame 2 is rotated into the working position, the switch 12 runs over the working surface of the stop 13 mounted on the housing 1 and closes the electrical network of the cylinder 14 of the control valve 9. The control valve 14 supplies, for example, pressurized air to the rod end of the cylinder 9 and thereby between each other, the thrusts 7 and 8, which by the control lever 6 and the power take-off lever 10 turn on the rotation of the cardan shaft 5, while the spring 11 is extended.

When the angle of inclination of the cardan shaft is higher than the allowable limit switch 12 moves off from the working surface and opens the electrical network of the control valve 14.

which blocks the access of air to the rod end of the cylinder 9, and the spring 11 turns off the gearbox 4 PTO. To resume rotation of the propeller shaft, it is necessary to set the angle in the position

at which the skew angle of the cardan shaft does not exceed the angle oC, then the end switch roller will interact with the working surface of the stop. Thanks to this solution, the cardan shaft is automatically protected from damage when the actuator is moved to the transport position and when digging notches of various depths.

The application of the present invention ensures reliable operation of the transmission.

at different positions of the working body.

Claims (2)

Invention Formula Earth moving machine with self-propelled chassis with selection control lever power and gearbox power take-off lever, a working body mounted on a rotating frame, a drive shaft of a drive of a working body and a safety mechanism containing an adjustable stop mounted on the chassis, and a limit switch mounted on a rotating frame with the possibility of interaction with a stop different from so that, in order to improve the reliability of work by automatically protecting the cardan shaft from damage when turning the working body, the safety mechanism is equipped with a two-link thrust, the links of which are connected by means of a pneumatic cylinder having a control valve electrically connected to the limit switch, and the free ends of the rod are connected to the power take-off control levers when In this case, the lever for engaging the power reduction gearbox is installed with the possibility of translating it into off position by spring. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 184732, cl. E 02 F 3/08, 1965. 2. Machine trench. M., Voenizdat, 1978, p. 1, p. 19-23 (prototype).