SU1203250A1 - Hydraulic drive of mechanism for tensioning flight conveyer of loading machine - Google Patents

Description

one

The invention relates to mining loading machines equipped with skid conveyors.

The aim of the invention is to increase the reliability of the loading machine scraper conveyor.

FIG. 1 shows the scraper conveyor of the loading machine, top view; in fig. 2 - same view

The scraper conveyor of the loading machine contains rotary and non-rotary frames 1 and 2 connected by a hinge 3, scraper chain A, a drive head 5 mounted for movement relative to the rotary frame 1 under the action of an actuating cylinder 6 communicated with the control cylinder 7 which has eyelets 8 and 9 is fixed on the swing and not turn frames 1 and 2, the hydraulic system with pressure and discharge lines 0 and 11, the distributor 12 and the safety valve 13. The control cylinder 7 is located on the longitudinal axis of the conveyor, rods The piston and piston cavities 14-17, respectively, of the executive and control cylinders communicate directly with each other, and the piston rods and piston cavities 15 and 17 of the control cylinder 7 communicate with the distributor 12 and the safety valve 13 with the hydraulic system of the machine.

When the conveyor is rotated, the eye 8 of the control cylinder 7 is displaced by an amount and. 6, proportional to the elongation of the chain that occurs when turning the conveyor.

During operation of the scraper conveyor, the automatic maintenance of a given tension of the scraper chain is carried out as follows.

When the conveyor is rotated to one of the sides by moving the pivoting frame 1 around the hinge 3 (the turning cylinders are not shown), fluid from the piston cavity 17 of the control cylinder is squeezed into the piston cavity 16 of the actuating cylinder 6, the rod of which pushes the drive head 5 the scraper conveyor, the specified tension of the scraper chain 4 or its sag is kept constant.

Work on the pre-tensioning of the scraper chain is carried out with the help of a distributor 12 connected to the hydraulic system of the machine.

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When tensioning the scraper chain 4: the handle of the distributor 12 is moved to a position that provides fluid supply to the piston strips 16 and 17 of the actuator and control cylinders 6 and 7, which are interconnected. Then the rod of the executive cylinder 6 extends the drive head 5, pulling the scraper chain 4.

When fluid is supplied to the rod cavities 14 and 15 of the executive and control cylinders 6 and 7, the rod of the executive cylinder 6 is retracted, the drive head 5 moves in the opposite direction, freeing the scraper chain and increasing its sag.

In the neutral position of the handle 20 of the distributor 12, the hydraulic system of the machine is closed and only the movement of fluid from the control cylinder 7 to the actuating cylinder 6 (or vice versa) is possible when the cone is turning.

A safety valve 13 is installed in the lines of the piston cavities 17 and 16 of the control and actuating cylinders 7 and 6 to discharge fluid into the hydraulic system of the machine when pieces of material get between the chain and the teeth of the drive sprocket.

When this drive head 5 goes., Freeing the scraper chain 4,

JJ reducing the load on the chain and components. The safety valve 13 is adjusted to a pressure corresponding to the maximum force in the circuit developed by the actuator.

40 The drive head 5 is returned to its previous position by means of the distributor 12, by supplying fluid to the piston cavities 16 and 17 of the control and actuating cylinder 6 and 7.

Instead of a safety valve, a hydraulic compensator (battery) can be installed, which is set to the appropriate pressure.

In this case, the drive head automatically returns to its previous position under the action of the fluid returned from the compensator hydraulic 55.

The extension of the drive head 5 and its return when the conveyor is straightened occurs forcibly, since

The stem of the control cylinder 7 extends and drives the fluid into the rod cavity 14 of the actuating cylinder 6, pulling the rod back and returning the drive head 5 back.

The presence of a single-rod control cylinder located on the longitudinal axis of the conveyor, as well as the indirect connection of the executive and control cavities of the same name

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cylinder and the connection of the cavities of the control cylinder with the help of the distributor and the safety valve in the pzdro-5 system of the maschine allows automatic maintenance of the set tension of the scraper chain and, if necessary, quickly and without great effort tension

fig 2

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Claims (1)

HYDRAULIC MECHANISM OF TENSION OF THE SCRAPER CONVEYOR OF A LOADING MACHINE, comprising a drive head mounted to move relative to the rotary frame under. the action of the Executive cylinder connected to the control cylinder, the ends of which are fixed on a rotary and fixed frame, and a hydraulic system with pressure and drain lines, a distributor and a safety valve, characterized in that, in order to increase the reliability of the conveyor, the control cylinder is single-rod and is located on the longitudinal axis of the conveyor, while the cavities of the same name of the actuating and control cylinders are interconnected, and the rod and piston cavities of the control cylinder through a safety The pressure valve and distributor are connected to the hydraulic system of the machine. Fig! SU „1203250 ^{1 1:}