Device for automatic control over tension of cables of open-mine excavator

FIELD: machine building.

SUBSTANCE: device consists of pulling and back cables, of pulling semi-block (3), of back semi-block (4) and of hydraulic system of compensation. The hydraulic system of compensation has pulling (9) and back (10) hydro-cylinders positioned on a handle; piston cavities of hydro-cylinders are connected with hydro-drive (6). Further, the system has back valve (11), safety valve (12) and valve (13). The pulling and back cables are reeved through pulling (3) and back (4) semi-blocks and external and internal strands of double-strand units on drums of a pressure winch. Rods of hydro-cylinders (9) are connected with semi-block (3), while rods of hydro-cylinders (10) are connected to semi-block (4) which facilitates changing length of pulling and back cables with transfer of the semi-blocks along the handle. Ratio of back diameters to diameters of pulling hydro-cylinders is more, than one.

EFFECT: reduced dynamic loads on working equipment, increased service life of cables, of strands of blocks and drums of winch.

2 dwg

 

The invention relates to hoisting and transport machinery, hoists and excavation and loading machines, designed to move goods, development and loading of the vehicle or the blade of minerals, can be used to set the tension of the flexible element with coiled drum.

The problem of maintaining the tension of the flexible element with the required accuracy relevant for machines and equipment, which is required to control the load on the traction bodies. With this purpose are various, more or less efficient and accurate methods and devices.

Known tensioner canadabuy machine (Patent RU №2271982, IPC VN 59/16, publ. 2006.06.20)containing an electromagnetic coil and a brake, made in the form of two disks between which is placed an iron powder. On one of the disks installed ring magnets, and the other disk is the pressure. The constant tension of the rope is achieved using centrifugal regulator, kinematically associated with the cores of the ring magnets and due to a change in braking torque.

Known mechanical device with constant tension ropes (Application WO 2005012036, IPC AV 29/02, publ. 2005.02.10), which is a flat elongated body, the ends of which are executed in the form of hooks, and in the center of the mustache is bowlen clip. Stretch the rope is fixed hook one end of the tension device and extends through the hook the other end and clamp, forming a loop, which with the help of studs can change their size, so the tension is kept constant. The use of such devices is only possible for flexible ropes and requires manual control.

As the prototype was selected lifting device to control tension ropes (WO 2006038299 IPC WV 11/08, publ. 2006.04.13)containing traction and breakout cables, guides the motion elements of the ropes in the form of blocks, a housing, a guide movement of the housing, the sensor tension ropes and hydraulic compensation system that supports a constant ratio of tensions and return traction rope.

Hydraulic compensation system allows to maintain a constant tension on the ropes, but set so that a lift only vertically, move the load at an angle or in the horizontal direction, it is impossible.

The technical object of the present invention is to provide a constant tension traction and breakout cables through automatic allocation of their length.

The task is solved by a device for automatic regulation of the tension of the ropes of working equipment to rannego excavator, which provides traction and breakout cables, guides the motion elements of the rope and hydraulic compensation system. Guiding elements of the movement of the ropes made in the form of traction and return Polupanov, which are mounted for movement in the plane of motion of the respective ropes. Hydraulic compensating system includes a pair of traction and return of hydraulic cylinders connected by a hydraulic system with return and safety valves, and the housings of the cylinders rigidly mounted on a handle, and a rod connected with each corresponding pair of cylinders by Polubotok.

The ratio of the diameters return to the diameters of the traction cylinders is greater than one.

Figure 1 presents a General view of the working equipment of the excavator;

figure 2 - hydraulic compensation system.

The device comprises (1) towing rope 1, the recoil rope 2, traction polyblock 3, return polyblock 4, hydraulic equipment 5, gidroprovod 6. Ropes 1 and 2 zapasovany traction through 3 and return 4 semiblocks, outer and inner streams, respectively, double blocks (figures not shown) on drums pressurized winch 7. On the handle 8 is installed traction cylinders 9 and return the cylinders 10. The cylinders 9 are connected with problemom 3 and the cylinders 10 Conn who are satisfied with problemom 4, that allows moving semiblocks along the handle to change the length of the ropes 1 and 2.

Hydraulic compensation system (figure 2) in addition to the hydraulic cylinders 9 and traction return 10, the piston cavity are connected by gidroprovod 6, contains a check valve 11 and the relief valve 12, the valve 13, the piston cavity of the hydraulic cylinders 9 and 10.

Regulation of the tension of the rope is in the process of excavator as follows. When the lowering of the arm 8 (Fig 1) its weight with the weight of the bucket is transferred to the return polyblock 4. The 2 ropes are tightened, polyblock 4 rises and moves the cylinders 10. The pressure in the cavities of the hydraulic cylinder 4 is increased and through gidroprovod 6 is transmitted to the check valve 11. If at that moment pulling the rope 1 is weakened, the traction cylinders 9 there is no pressure and through the check valve 11 is supplied hydraulic fluid. In the cavity of the hydraulic cylinder 9 increases the pressure, the cylinders 9 are moved together with traction problemom 3, as well as the diameter of the cylinders 10 is larger than the diameter of the cylinders 9, moving polublok 3 will be more moving polublok 4. Thus, moving semiblocks 3 and 4 along the handle 8, it is possible to reallocate the length of the traction 1 and return 2 ropes by an amount proportional to the difference of the squares of the diameters of hydration the ditch. The check valve 11 is open until pressure equalization in traction (9) and the return (10) cylinders. If the tension of the ropes 1 and 2 for some reason exceeds, the hydraulic fluid from the respective cylinders is discharged through the pressure relief valve 12. The distance between problemami 3 and 4 decreases and the tension weakens.

Thus, the device allows you to maintain a constant tension traction and breakout cables and to reduce the dynamic load on the working equipment, excavation and loading machines and lifts to increase the service life of ropes and blocks and streams of the drums of the winch.

The automatic tension control ropes career excavator containing traction and breakout cables, guides the motion elements of the rope and hydraulic compensation system, characterized in that the guiding elements of the movement of the ropes made in the form of traction and return Polupanov installed so that they can move in the plane of motion of the respective ropes; hydraulic compensating system includes a pair of traction and return of hydraulic cylinders connected by a hydraulic system with return and safety valves, and the housings of the cylinders rigidly mounted on a handle, and a rod connected with the ACC is stoysin each pair of cylinders by Polubotok, moreover, the ratio of the diameters of the return cylinders to the diameter of the traction cylinders is greater than one.



 

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