DE8415844U1 - Carrying device for containers - Google Patents

Description

Kaup GmbH & Co. KG
Society for Mechanical Engineering
87 50 Aschaffenburg

Carrying device for containers

The invention relates to a carrying device for containers or the like with a support pin at each of the four corners, which can be pivoted for the purpose of locking and unlocking by means of a hydraulic actuating device and/ ^or with a hydraulic device for changing the span, that is to say the distance between the support pins, whereby the carrying device can be attached to a support member of a lifting device by means of pulling elements, whereby a pulling element is understood to mean a rope, a chain or a band or the like. It is known that such carrying devices are connected to a forklift truck (forklift) or a special device, whereby this forklift truck or this special device in turn has a pressure medium source driven by the energy source of this forklift truck or special device, which is connected to the hydraulic device or devices via hoses and pressurizes them via valves arranged in the forklift truck or special device. In the case of the previously known carrying devices, the hydraulic devices mentioned cannot be used if the carrying device is attached to a lifting device such as a crane or the like, provided that this lifting device does not have its own pressure medium source that can be connected to the hydraulic device of the carrying device. If it was necessary to attach the previously known carrying devices to such a lifting device without its own pressure medium source, locking and unlocking had to be carried out manually and the span could not be changed. The previously known carrying devices were therefore only very little suitable for use on lifting devices without their own pressure medium source.

Furthermore, carrying devices are known which can be attached to

Cranes without pressure medium source are provided and where
In addition to the support ropes on which the support device hangs, a shorter tension rope is provided which acts on a lever. This lever is connected to a mechanical transmission, which in turn interacts with two shafts, each of which leads to a crosshead of the support device and is mechanically connected to the rotating support pins. Such mechanical devices are very complex and require maintenance and
increase the weight of the carrying device considerably. Due to the limited pivoting angle of the lever, some devices have to be pulled twice for each locking and unlocking. This reduces safety.

The invention is based on the object of providing a carrying device according to the preamble of patent claim 1
to make it fully usable when it is connected to a
Heoezeug is attached that does not have its own pressure medium source
ie that in this support device by means of
a hydraulic actuation device and
can be unlocked and/or the span can be changed if there is no pressure supply from the hoist
possible i st”

This task is solved by using a pressure supply
the hydraulic device (actuating device for
Locking and unlocking or hydraulic device for
Changing the span) on the support device a pumping device that can be operated by means of a further, ie additional pulling device, which is also connected to the hoist
If the crane is a multi-side crane, this additional traction device can be connected to the connection for another rope
and the pumping device via this
be operated.

«&igr;"&Kgr;—

According to a particularly advantageous embodiment of the invention, the device can also be used with a crane with only one rope. Claim 3 specifies an expedient solution for this purpose, i.e. the length of the supporting traction elements and the length of the additional traction element are dimensioned relative to one another in such a way that when lifting, the additional traction element initially pulls tight as long as the supporting traction elements are not tightened and thereby actuates the pumping device before the traction elements supporting the entire support device are pulled tight, whereby until they are pulled tight, this supporting ^traction element as the additional traction element travels a path sufficient to actuate the pumping device once. The pumping device is actuated via the additional traction element until the traction elements intended for carrying reach their tightened position. The pumping work is therefore supplied to the pumping device by exerting a force in the additional traction element over a corresponding stroke, whereby the counterforce is generated by the dead weight of the support device. The pumping device can be, in its simplest form, but also very practical, a simple cylinder which is connected to the support device and whose piston rod is connected to the traction element, whereby the piston is supported against a spring which pushes the piston back to its starting position when the other traction element is released. Structurally, the simplest form is obtained when the traction element acts on the piston rod in the same direction. If the cylinder is arranged with the bottom upwards so that the traction element acts on the piston rod via a yoke, the construction volume can be better utilized, since the pressure chamber on the piston side has a larger volume than the piston rod. Another advantage would be that the pressure chamber sealed off by a seal on the piston rod always has only a low pressure. The pumping device can also be a rotating device, whereby the other traction element is wound onto a cable drum which is wound up by spring preload and which is connected to the shaft of the pumping device.

It is advisable to provide a length compensation device to compensate for unequal elongations of the supporting tension members and the additional tension member, for example by installing a pre-tensioned spring in the additional tension member, or in the case of the lifting device being a cylinder in which only part of its stroke is used, so that a remaining part of the stroke is available in the event of unequal elongations. However, in every case the displacement volume of the pumping device effective when the additional tension member is tightened once should be greater than or at least equal to the effective stroke volume of the hydraulic actuating device for locking and unlocking the support pins, so that the stroke volume required for locking or unlocking is actually available for each stroke. For telescoping to change the span, it is permissible that several strokes of the additional tension member are required.

A particularly useful further development of the invention relates to the hydraulic circuits and here in particular to a circuit which ensures that with each stroke of the pump device, i.e. with each tightening of the additional pulling element from the loose position to the end position, when switching to the actuating device for locking and unlocking, a full lifting process is carried out in the hydraulic devices for locking and unlocking, and always alternating locking and unlocking, so that locking occurs automatically after Jeoefp is put down and unlocking occurs every second tightening, before the supporting pulling elements lift the supporting device. Advantageous developments of such a hydraulic circuit are set out in claims 5 and following.

The invention and its details are explained below using the embodiment shown in the drawing.

Figure 1 shows a side view of a support device,

Figure 2 shows a plan view of the same transport device.

Figure 3 shows a circuit diagram for the interconnection of the pumping device with the two hydraulic devices,

Figure 4 shows a section through a directional control valve with changeover switching device.

Figures 5, 6 and 7 show developed views of the circumference of parts of this valve.

Two receiving pockets 5 are provided on the underside of the base part 1. ^; &eegr; into each of which a fork of a forklift can be inserted when the carrying device is to be picked up by a forklift. Two fastening eyes 2 are connected to the top of each receiving pocket 5. A carrying cable 3 is attached to each of these fastening eyes 2. The four carrying cables 3 are hooked together into a carrying ring 4, which in turn can be attached to a hook (no longer shown in the drawing) of a crane (also no longer shown in the drawing). Two telescopic parts are provided in the base part 1.

6 and 7 are mounted axially displaceably. The axial displacement of the telescopic part 6 is effected by a cylinder-piston unit with the cylinder 8 and the piston rod 9, while the displacement of the telescopic part

7 is effected by a cylinder-piston unit with the cylinder 10 and the piston rod 11, wherein the piston rod 11 is attached to the telescopic part 7 and the cylinder 10 is attached to the base part 1. Analogously, the cylinder 8 is attached to the base part 1 and the piston rod 9 is attached to the telescopic part 6”

A crosshead 12 is attached to the end of the telescope part 6 and a crosshead 13 is attached to the end of the telescope part 7. A support pin device (locking device) 14 is arranged at each of the two ends of the crosshead 12, the respective pivot pin 15 of which is connected to a lever 16, the levers 16 being connected to one another via a push rod 17. The upper lever 16 in Figure 2 is designed as a two-armed lever, on the second arm of which the piston rod of a piston which can be moved in a cylinder 18 engages.

Two such support pin devices are also provided on the crosshead 13, the associated levers of which are connected by a push rod 20

are connected to each other and the actuation is effected by a cylinder 21,

On the side of the base part 1, between two fastening plates 22, a pump cylinder 23 is arranged in which a piston can be moved, the piston rod 24 of which is connected to another pulling element 25.

The hydraulic circuit by which the ^pump cylinder 23 is connected to the cylinders 8 and 10 for the telescopic extension and to the cylinders 18 and 21 for the actuation of the unlocking and locking is shown in Figure 3,

A piston 26 is displaceable in the pump cylinder 23, whereby the effective pressure chamber 27 is formed on the piston rod side and a compression spring 28 is arranged in this pressure chamber.

This pressure chamber 27 is connected to a delivery line 29, which leads to the inlet of an arbitrarily operable three-port / two-position / directional valve 30. A line is connected to one output of this three-port / two-position / directional valve 30, which is assigned to the actuating device for locking and unlocking, while a line 32 is connected to the other output connection of this directional valve 30, which is assigned to the telescopic device 8, 9 - 10, 11. Line 34 and line 35 are connected to a pressureless container 33, with any pressure medium that may have passed the piston 26 being discharged via line 35.

The piston surface of the piston 26 is dimensioned such that at the highest possible pressure during operation, the force in the piston rod 24 is in any case smaller than the total weight of the carrying device without container,,

The line 31 leads to a non-return valve 36, from which

from a line 37 leads to the four-port / two-position / directional valve 38, the actuating device of which is operatively connected to the piston rod 24 via a changeover switching device 39 in such a way that every time the piston rod 24 has reached its extended operating end position, the valve 38 is switched to another of the two possible switching positions. The two lines 40 and 41 are connected to the two outlets of the valve 38, of which the line 40 leads to the piston-side pressure chambers of the cylinders 18 and 21 and the line 41 leads to the piston-rod-side pressure chambers of the cylinders 18 and 21,

Between lines 34 and 29 there is a

opening non-return valve 42 is arranged. A pressure relief valve 43 is arranged between the lines 31 and 34. A corresponding pressure relief valve 44 is connected between the line 32 and the line 35 (or 34).

The line 32 leads to an inlet of an arbitrarily operable four-port / two-position / directional control valve 45, the position of which determines whether the piston rods 9 and 11 extend or retract when supplying from the cylinder 23. A line is connected to one outlet of the directional control valve 45, which leads to the two piston-side pressure chambers of the cylinders 8 and 11 , and a line 47 is connected to the other outlet "s+, which leads to the piston rod-side pressure chambers of the cylinders 8 and 10.

The mode of operation is as follows: If the piston rod 24 is pulled out of the cylinder 23 in the position of the directional control valve 30 shown in the drawing, pressure medium is led from the pressure chamber 27 through the lines 29, 31, 37 and 41 into the piston rod-side pressure chambers of the cylinders 18 and 21, thereby locking the support pins (Tw is Socks). When the end position of the piston rod 24 is reached, the directional control valve 8 is then switched over by means of the snap-action switching device 39.

If the support device is now set down and the additional pulling element 25 is _released , the piston 26 is pressed into the cylinder 23 under the action of the spring 28 and when the further pulling element 25 is pulled tight again, the piston again feeds out of the pressure chamber 27 through the lines 29, 37 and now 40 into the piston-side pressure chambers of the cylinders 18 and 23, so that the support pin devices are unlocked.

In order to ensure that the pistons in the cylinders 18 and 21 are moved to their respective end positions each time the additional traction element 25 is tightened and pulled through, the displacement volume in the pressure chamber 27 is greater than the sum of the displacement volumes of the piston-side pressure chambers of the cylinders 18 and 21. If the pistons have reached their end position in these and the piston 26 continues to pump, the excess pressure medium is discharged via the pressure relief valve 43 into the line 34 and via this into the container 33. If the directional control valve 30 is in the second position, not shown in the drawing, the pressure medium pumped from the cylinder 23 is fed to the cylinders 8 and 10.

The non-return valve 36 prevents the pistons from moving back when the pistons in the cylinders 18 and 2) are in their end position and the pump cylinder 23 is no longer pumping, and thus serves to lock the pistons in the two cylinders 18 and 2K. If the pulling element 25 becomes slack, the piston 26 in the cylinder 23 is pushed back under the effect of the force of the spring 28 and sucks through the line 29 via the non-return valve and through the line 34 from the container 33. The non-return valve 1142 is closed when pumping from the pump cylinder 23.

In order to ensure that the carrying device according to the invention can be used optimally even when it is lifted by a forklift

which is equipped with a pressure medium source and control elements for the pressure medium flow, a further line 50 and 51 is connected to each of the two lines 40 and 41. Each of these two lines 50 and 51 leads to a separable connecting part 54 which leads to the connection to a pressure line of a lift loader (no longer shown in the drawing). A releasable non-return valve 52 is connected to line 50, the control connection of which is connected to line 51 between non-return valve 53 ^and connecting part 54. In the same way, a releasable non-return valve 53 is connected to line 51, the control chamber of which is connected to line 50 between non-return valve 52 and connecting part 54. If the connecting parts 54 are connected to the pressure lines of the lift truck and the line 50 is pressurized, the non-return valve 52 opens so that fluid can flow through it. At the same time, the non-return valve 53 is opened so that pressure medium can flow out of the line 51, which then acts as a return line. The effect is analogous if the line 51 is pressurized _so that fluid flows through the non-return valve 53 and the non-return valve 52 is opened. With such a design, it is expedient if, instead of the directional control valve 38, a four-port/orifice directional control valve is provided which, when connected to a lift truck, is arbitrarily brought into the third switching position in which all ports are closed _; or an additional check valve is arranged in the lines 37 and 38.

Similarly, a line 57 is connected to line 47* in which a pilot-operated non-return valve 56 is arranged and which leads to a connecting part 55 and a line 58 is connected to the line in which a pilot-operated non-return valve 59 is arranged and which leads to a connecting part 55. The control chamber of the non-return valve 56 is connected to line 58 and the control chamber of the non-return valve

The check valve 59 is connected to the line 57. The effect is analogous to that of the check valves 52 and 53. In these cases it is advisable to provide a four-port/three-position one-way valve instead of the directional valve 5, which blocks all ports in one switching position.

Figure 4 shows a cross-section of the directional control valve 38 and the changeover switching device 39 connected to it. The changeover switching device 39 has channel-shaped components 71, 72 and 73. A development of the circumference of the component 71 is shown in Figure 5, a development of the circumference of the component 72 is shown in Figure 6 and a development of the circumference of the component 73 is shown in Figure 7. These components are provided with locking projections in such a way that each time the piston rod 24 moves against the actuating head 74, the detents rotate relative to one another by one detents and the valve 38 moves one way into one switching position and the next ^way into the other switching position.

Claims (9)

Kaup GmbH & Co8 KG Mechanical Engineering Company 8750 Aschaffenburg Claims 1. Carrying device for containers with a supporting pin (twist lock) at each of the four corners, which can be pivoted for the purpose of locking and unlocking by means of ^a hydraulic actuating device ⁺ Lind or with + a hydraulic device for changing the span, wherein the carrying device can be suspended from a supporting member of a lifting device by means of pulling elements, characterized in that for supplying pressure to the hydraulic device (actuating device 18, 21 for locking and unlocking the supporting pins or span changing device 8,, 9"; 10, 11) on the carrying device a pump device (23, 24) which can be actuated by means of a further pulling element (25) connected to the lifting device. 2. Support device according to claim 1, characterized in that the pump device is a cylinder-piston unit (23, 24), the cylinder (23) of which is attached to the support device and the piston (26) of which is displaceable against the force of a spring (28) and to whose piston rod (24) the further traction element is connected, 3. Carrying device according to claim 1 or claim 2 _} characterized in that the length of the further pulling element is dimensioned such that when the pulling elements (3) intended for carrying are still loose, the further pulling element (25) tightens and when the supporting pulling elements (3) are tight, the further pulling element (25) is tightened when the position of the piston (26) of the pumping device (23, 24) is displaced against the force of the spring (28). 4. Support device according to one of the preceding claims, characterized in that the displacement volume of the pump device (23, 24) effective when the additional pulling element (25) is tightened once is at least equal to the effective displacement volume of the actuating device (18, 21) for locking and unlocking the support pins, 5. Carrying device according to one of the preceding claims, which is provided both with a device for actuating the unlocking and locking of the carrying pins and with a device for changing the span, characterized in that an arbitrarily actuable three-port / two-position / directional control valve (30) is connected to the delivery line (29) of the pumping device (23), at one output of which the actuating device (18 _P 21) for locking and unlocking the carrying pins and at the other output of which the device (P, 9, 10. 11) for changing the span, 6. Carrying device according to one of the preceding claims with an actuating device with double-acting cylinders for locking and unlocking the support pins, characterized in that a four-port / two-position / directional control valve (38) is connected to the delivery line (29 - 31) of the pumping device (23, 24), to whose two outputs the two lines (40. 46) leading to one side of the cylinders (18, 21) of the actuating device are connected and to whose second input a line (34) leading to a pressureless storage container is connected and whose actuating element is connected to the pumping device (23, 24, 26) via a spring changeover device (39) in such a way that each time the end position of the piston rod (24) on the displacement side of the piston (26) of the pumping device is reached (23, 24) the directional control valve (38) is switched to the other of its two possible switching positions. 7. Carrying device according to claim 6, characterized in that a connecting line, which is on the other hand connected to the discharge line (34), is connected to the delivery line (29) of the pump device (23, 24, 26) upstream of the directional control valve (30), in which a non-return valve (42) opening towards the delivery line (29) is arranged. &dgr;. Carrying device according to claim 1 or another of the preceding claims, characterized in that a connecting line (50, 51, 57, 58) is connected to a line (29 or ³¹ or 37 or 32) extending from the pumping device (23, 24, 26), which leads to a connecting part (54 or 55) provided for connection to a pressure line and in which a non-return valve is arranged which opens to the line (29, 31, 32, 37) connected to the pumping device (23, 24, 26). 9. Support device according to claims 5 and 8, characterized in that the connecting line (50 or 51 or 57 or 58) is connected between the directional control valve (30) which can be switched over to the actuating devices (18, 21 or 8, 9, 10, 11) at will and the respective actuating device (18, 21 or 8, 9, 10, 11), 10, support device according to claims 6 and 8 or 5 and 9, characterized in that a connecting line (50 or 51 or 57 or 56) is connected to each of the lines (40, 41 or 47, 48) leading to a cylinder side and that the non-return valve arranged in each connecting line is a lockable non-return valve (52 or 53 or 56 or 59) and that the control chamber of each of these non-return valves (52, 53, 56, 59) is connected to the other line of the same line pair (40, 41 or 47, 48).