SU52012A1 - Single rope grab - Google Patents

Description

Single-rope grabs are known, the jaws of which are held in the closed position by means of a vertical rod that is movable in the sleeve surrounding it, which serves to suspend the grapple to the crane hook and is provided with a locking device that allows the jaws to open at any height along the height.

The essence of the present invention lies in the device of the locking device, made in the form of a horizontal bracket that is movable in vertical guides, which is installed by means of a lever mechanism against the pivot points of the lock and prevents them from opening when the grapple is lifted.

In order to mitigate shocks when opening the grapple's jaws, according to the invention, an air damper formed of a cylindrical sleeve incorporating a locking mechanism and a movable cylindrical yoke connected to the locking bar and the jaw of the grapple is used.

In FIG. 1 shows a vertical longitudinal section of the grapple with the jaw x closed; FIG. 2-

the same with open jaws x; FIG. 3-vertical section on the locking mechanism; FIG. 4 is a horizontal section along the line AB in FIG. 3; FIG. 5 and b-part of the mechanism controlling the movements of the closing bracket in two positions.

The jaws 22 of the grapple, when opening and closing, rotate around the axis 23. The free edge of each jaw is articulated with the rod 2J connected to the yoke /, which tightly embraces the sleeve 3. The yoke 4 passes through the yoke 4, fitted with a fork 7 at its lower end, which when lowering the boom, it sits on the axle 23. The upper part of the yoke 7 is provided with an eye .5 for the load hook of a crane.

In the lower part of the sleeve 3 is the closing mechanism, the device of which consists in the following.

On each side of axle 23, pair earrings 8 are pivotally mounted. Springs Y are pressed toward the axis. In the upper part, a through axle is passed through each pair of earrings, on which the roller 9 is freely attached. A horizontal bracket is located above the springs W in the sleeve 3 across the axis 23. The ends of which are bent at a right angle in such a way that they cover the rollers 9. The bracket // is provided with a vertical shank / 2, passed into the guide groove 14 in the sleeve 5. The bracket / 7 is articulated by means of the earring / 5 with the short arm of the crank of the lever / 5, mounted on B / 5, missed through local broadening 24 of the sleeve 3. yield present outwardly of the long arm of the lever end of the cable is attached / 7 spuskayuschegos freely to the working, a control operation of the grapple ..

Under the shank 12 of the bracket // in widening 24 of the sleeve 3 is the dog 18, mounted on the axis 19 and provided with a counter-load 20,

Work .. grapple is as follows. A grapple with closed jaws, suspended by the rifle 5., To the cargo hook of the crane, is mounted above the required space. In this case, the sleeve 3 is fully pushed into the holder /, and the fork 7 of the rod covers the axis 2J and is held in this position by the rollers 9 of the earrings 8 pressed in the fork by springs 10. The bracket / 7 is lowered into the lower position, in which its bent ends are in the diametral plane rollers 9. The lever 16 is raised at this time, and the clip / 7 is closed by the pawl 18.

Anywhere along the height of the lifting jaw grapple can be opened; to do this, sweat the cable 77; the lever 16 will then turn to the position shown in FIG. 6, and through the earring 13, lift the bracket 77, guided by the shank 72, sliding into the groove 14. In the upper position of the bracket 77, it comes out of engagement with the rollers 9, as a result of which the plug 7 tears them apart, turning the earrings 8 while the sleeve 3 will be disconnected from the holder 7 and under the action of its own weight will Dip, opening the jaws rotating around axis 23. When lowering the sleeve 3, it will come out of the holder 7 (Fig. 2), creating a vacuum in the air inside it and thus promoting sharp tremors In order to fill the grapple lowered onto a pile of bulk material, the crane's lifting cable is released, as a result of which the yoke 7, together with the rod, will start to lower, sliding along the sleeve 3 until the fork 7, moving the rollers 9 apart, does not hang on the axle 23 At this moment, the rod 4 rotates the pawl 18, which held the yoke 77 in a raised position, as a result of which the yoke lowers and closes the rollers 9. With the subsequent lifting of the crane lifting cable, the entire grapple starts to rise, and its jaws are closed, gripping the material.

Subject and 3 ore n.

1. A single-cable grab, the jaws of which are held in the closed position by means of a movable vertical rod in its sleeve, which serves to hang the grapple to the crane hook and is provided with a locking device that allows the opening of the jaws at any place along the lifting height, characterized by closing the locking device is applied horizontal bracket 7 /, installed against the earrings 8 of the locking device and preventing their opening. 2. An embodiment of the single-cable grapple according to claim 1, characterized in that, to turn off the locking device, the bracket is made movable in vertical guides by means of a manually operated lever mechanism 13-16.

3. The form of a single-line grab on the PP. 1 and 2, characterized with

In order to hold the bracket in the retracted position, a counter-loaded two-shoulder dog 18 is applied, one shoulder of which supports the raised bracket to prevent it from lowering, and the other shoulder is designed to turn the dog with the finger of the locking rod of the grapple.

4. The shape of the grab under item 1, characterized in that the locking mechanism is enclosed in the cavity of the cylindrical sleeve 5, which forms together with the grapple and the jaw of the grapple together with the clamping bar and jaw of the grapple when opening the jaws of the grapple.

Fig5. ,,