NL1021187C2 - Hydraulic brick clamp connectable to mobile hydraulic crane, has locking pin position changed using cam operated hydraulic switching valve - Google Patents

Abstract

The clamp is suspended from a connecting part (17) which can be rotated when retracted. At least one hydraulic switching valve (5, 6) in the clamp can be operated by a cam. The locking pin for altering the size of the clamp, depending on the size of the brick package being handled, is manipulated by lowering the clamp to the floor and allowing the crane to drop several centimetres, which disengages the rotary part (3) of the crane and allows it to rotate freely in order to operate the cam for the switching valve. The rotary part is then rotated into the lifting position and the clamp is raised, causing the clamp cylinder (9) to be activated for picking up the brick package.

Description

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Hydraulic stone clamp with switchable additional functions.

The invention relates to a stone clamp of the type in which a package of stones or the like is clamped with the aid of a hydraulic cylinder in order to be transported. This 05 type is mainly used for mobile hydraulic cranes.

Because the packages to be transported differ in size, the stone clamp is adjustable. To this end, a part is extendable whereby the setting is fixed with locking pins. These locking pins are removed manually, after which the clamping cylinder is used to adjust hydraulically and then the locking pins are replaced and secured by hand.

10 This operation requires manpower and walking from the driver's seat to the terminal and vice versa and provides a significant interruption of work.

The invention now encompasses a solution in which auxiliary cylinders operate the locking pins, wherein no additional hydraulic components need to be added to the crane and suspension. A commonly used type of clamp has a passage in the hydraulic rotator for the supply and discharge lines of the clamping cylinder. To use the stone clamp according to the invention, the existing connections and operating valves can be used.

To operate the locking pins, a switching mechanism is installed wherein the lines of the clamping cylinder are switched to one of the locking pin cylinders and then operated from the driver's seat. The clamping width is adjusted by switching to the clamping cylinder and the locking pin is then reset after switching. Switching is accomplished by placing the stone clamp on the ground and then lowering the crane a few centimeters. The rotator is hereby disconnected and can rotate freely, whereby the switching part actuates the switching valves with a cam. By turning the rotator into the hoisting position and hoisting the stone clamp, the clamping cylinder is switched on for clamping stone packages and the stone clamp is connected to the rotator for rotation.

In addition to the hydraulic design, the rotator can be used to operate the locking pins in a direct mechanical manner.

The invention will be explained in more detail with reference to the drawing.

FIG. 1 is a partial cross-sectional view of the stone clamp from the side.

FIG. 2 is a cross-sectional view of the switch housing in the switch position.

FIG. 3 shows in cross section the switch housing in hoisting position.

FIG. 4 shows section IV-IV.

FIG. 5 shows section V-V.

FIG. 6 shows the hydraulic scheme according to the invention.

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FIG. 7 shows the adjusting mechanism.

FIG. 8 shows a section through the locking pin.

FIG. 9 shows schematically a mechanical operation of the locking pins with the pins in the closed position. 10 shows the mechanical operation in the position where two locking pins are retracted.

In Fig. 1, the stone clamp is indicated by (1). The stone clamp (1) is suspended with a rocker (2) from the rotator (3) on the crane. Stone clamp (1) has switch housing (4) near the suspension in which the hydraulic valves (5) and (6) are located. The adjusting mechanism (7) is suspended from rods (8). Clamping cylinder (9) is connected to clamping arms (10) which pivot about pivot points (11). In the adjusting mechanism (7) are two locking pin cylinders (12) which are designed to be double acting and are each provided with two locking pins (13).

The adjusting mechanism consists of two box profiles (14) in which tie rods (15) with bores (16). The length can be adjusted by adjusting the tie rods (15).

15

The switch housing (4) hangs on the switch part (17) with suspension eye (18). Switching part (17) is provided with coupling plate (19). Coupling plate (19) is rectangular and is blocked in the hoisting position by plates (20) which have a suitable recess. Between suspension eye (18) and coupling plate (19) is a cylindrical part (21) which allows axial displacement and rotation in switch housing (4). Mounted on coupling plate (19) is cam (22) which can operate valves (5) and (6) when the switch part (17) is rotated. Cam (22) is positioned so that in the hoisting position, valves (5) and (6) are in the starting position.

In FIG. 6 the hydraulic diagram is indicated. The line (23) for expressing the clamping cylinder (9) runs through valve (5) and valve (6), the passage being free in the starting position. The return line (24) is coupled to the return lines of locking pin cylinders (12). When valve (5) or (6) is activated, line (23) is closed and connected via line (25) or (26) with locking pin cylinder (12) and then operated with the control levers of clamping cylinder (9).

In order to keep the stone clamp (1) in balance, it is necessary to effect an equal adjustment on both sides.

A version of the invention involves a direct mechanical operation of the locking pins. In FIG. 9 a drive to crankshaft (28) and crankshaft (29) is provided on the switching part (17) instead of cam (22) with a chain or toothed belt. At the crankshaft (28), (29) is a double crank (30), (31) which is hingedly connected to rods (32) on locking pins (13). The double stools (29) are placed at an angle of 90 degrees with the stools at an angle of 45 degrees with respect to the axis of the locking pins (13).

When the switching part (17) is rotated 45 degrees from the rest position according to the arrow (33), the double crank (30) will give a large displacement (35) to the locking pins (13), thereby releasing the pull rods (15). Double crank (31) will then give locking pins (13) a small oscillating movement (36) while maintaining the locking. A rotation according to arrow (34) will release the other set of locking pins in the same way and keep the first locked.

05 The method is as follows:

The stone clamp (1) is placed on the ground.

The crane arm is lowered.

With the rotator (3), switching part (17) is rotated a quarter turn so that valve (5) is activated.

10 Pull rods (15) are released with locking pin cylinder (12) with the control lever of clamping cylinder (Θ).

With the rotator (3), the switching part (17) is returned to the starting position.

The stone clamp (1) is brought to the correct clamping width with the control cylinder clamping lever.

With the rotator (3), switching part (17) is turned a quarter turn so that valve (5) is activated.

Pull rods (15) are secured with the locking cylinder (12) control lever (9).

With the rotator (3), the switching part (17) is returned to the starting position.

To adjust the other tie rods (15), the same operation is performed with the help of valve (6).

After the adjustment, the lifting plate (19) pulls up the coupling plate (19) and blocks it between plates (20).

With the mechanical version, only the switching part (17) needs to be turned to release a set of locking pins (13), the locking pins (13) returning to the position upon turning back.

Claims (5)

A hydraulic stone clamp of the type suspended with a rotator on a mobile hydraulic crane with switching device for hydraulic ancillary functions, characterized in that the stone clamp (1) is suspended on the switching part (17), whereby switching part (17) is retractable and retracted position is rotatable and cam (22) can operate one or more valves (5, 6) whereby the operation of the main function is switched to the secondary function. 2. A hydraulic stone clamp according to claim 1, characterized in that the switching part (17) is provided with suspension eyes (18) and a rectangular plate (19) which, when pushed in, becomes free from recesses in plate (20), whereby rotation of switching part ( 17) cam (22) can operate valves (5, 6). 3. Hydraulic stone clamp according to claims 1 and 2, characterized in that the stone clamp (1) is provided with an adjusting mechanism, wherein the tie rods (15) are secured in sleeve profile (14) with pins (13) which are secured by hydraulic cylinders (12). operated. Hydraulic stone clamp according to claim 1, 2 and 3, characterized in that the switching part (17) is retracted by placing the stone clamp (1) on the ground and lowering the crane arm. 20 4- Conclusions. Hydraulic stone clamp according to claim 1, 2, 3 and 4, characterized in that the switching part (17) drives a set of double cranks (28, 29) with double cranks (28, 29) being at an angle of 90 degrees and at an angle 45 degrees to the center line of locking pins (13), the locking pins (13) with rods (32) being connected to double cranks (28, 29)