Grab bucket, particularly in maritime transshipment applications

Abstract

A grab bucket (1), notably used for the maritime transshipment of ore, comprising a frame (2), a swivel (3) integral with one end of the frame, called the upper end, of the jaws (40, 41), and a system (2') for closing and opening the jaws when they are full, said system (2') comprising cables (20), and at least two hydraulic cylinders (21) dedicated solely to opening the full jaws, characterized in that it comprises at least one additional hydraulic cylinder (50) dedicated to closing the jaws (40, 41) when the jaws are empty and to opening the empty jaws. [Fig. 2]

Description

Title of the invention: Grab bucket, particularly for use in maritime transshipment

[0001] The invention relates to a two-jaw clamshell bucket, also known as a "crapaud".

[0002] A toad is used by being suspended from the hook of a lifting device and allows to grasp bulk materials of the aggregate type such as gravel, rocks, ore, etc., in order to transship them and deposit them in a storage place for example in a transport vehicle or a hold of a ship.

[0003] The invention will be described more particularly, without however being limited to it, with regard to a use of maritime transshipment in particular of ore above water, from a quay or a barge into a transport vessel such as a bulk carrier.

[0004] A typical transshipment crane operates using a system for opening and closing the jaws under load. This system includes traction cables and at least two hydraulic cylinders. When gripping bulk ore, the opening and closing system is designed to ensure the jaws close because they simultaneously bear against a hard abutment surface, in this case, the ore pile. Once the crane is pivoted over the storage hold, the jaws are opened by actuating the hydraulic cylinders to release the aggregates. Then, the crane is brought back over the ore to be picked, with the jaws remaining open.However, depending on the type of aggregate, particularly for ore, and depending on the weather conditions (rain, humidity), a quantity of aggregate often remains stuck to the inner walls of the jaws. When the toads are brought back to port with their jaws open, residual ore systematically falls into the sea. The ore that falls into the sea causes pollution over time and devastates marine life (killing fish and coral in the warm waters of the Southern Hemisphere). Furthermore, the amount of ore lost at sea, and therefore not transshipped, represents a loss of revenue. Finally, there is always a need to reduce transshipment time, particularly to save on logistics costs.

[0005] The invention therefore aims to provide a clamshell bucket (or grab bucket) which does not have the aforementioned disadvantages.

[0006] According to the invention, the clamshell bucket, notably used for the maritime transshipment of ore, comprises a frame, a swivel which is integral with one end of the frame, called the upper end (for suspending the clamshell bucket from a lifting device), and jaws (opposite the swivel) which are adapted to be The clamshell bucket is characterized in that it includes movable parts for opening and closing, and a system for opening and closing the jaws when they are full. This system comprises traction cables and at least two hydraulic cylinders, referred to as standard hydraulic cylinders, which are dedicated solely to opening the full jaws. The traction cables are used to close the jaws when gripping material (because the jaws can bear against a hard surface of the material at the same time as the cables are pulled). The two standard hydraulic cylinders are dedicated solely to opening the jaws when they are full. The clamshell bucket is characterized in that it includes at least one additional hydraulic cylinder dedicated to closing the jaws when they are empty and to opening them when empty.According to one characteristic, said at least one additional hydraulic cylinder acting to close and open the jaws of the empty clamshell bucket is therefore distinct from the usual hydraulic cylinders for opening the jaws when the clamshell bucket is full.

[0007] Thus, the additional hydraulic cylinder allows the jaws to close immediately after the ore has been emptied into the unloading and storage area, while the grab is still suspended above the area. Indeed, suspended in mid-air, the traction cables cannot close the jaws. Therefore, whereas a conventional grab's jaws remain open when it is lowered empty over the pile to be gripped by passing over water, the grab of the invention has its jaws closed during the empty return of the grab thanks to the additional hydraulic cylinder. This prevents residual ore from falling and the resulting problems. Furthermore, as soon as the grab is again above the pile of ore to be gripped, the jaws are reopened as soon as the grab lowers, thus saving logistical time.

[0008] Adding at least one additional hydraulic cylinder, preferably self-operating, can constitute an adaptation of an existing clamshell bucket, and this can be done according to a design that is easy to implement. Furthermore, powerful hydraulic and electrical resources are not required given the force of the cylinder, since the cylinder is actuated when the jaws are empty. The clamshell bucket of the invention therefore provides a simple and relatively cost-effective solution.

[0009] According to one feature, said at least one additional hydraulic cylinder is self-sufficient in hydraulic and electrical energy within the clamshell bucket, the clamshell bucket comprising a self-sufficient hydraulic power unit and self-sufficient electrical supply means, which are carried by the chassis and are connected to said at least one additional hydraulic cylinder for its operation.

[0010] According to one feature, said at least one additional hydraulic cylinder has a force that corresponds to the force required to close and open the The jaws are empty. Therefore, no operating force is required to open or close the receiving bucket; only a force corresponding to the weight of the jaws is needed. Thus, the cylinder's dimensions and the energy required for its operation are optimized to reduce the weight of the hydraulic power unit and the electrical power requirements.

[0011] According to one feature, the clamshell bucket includes remote control and communication means for said at least one additional hydraulic cylinder, said remote control and communication means being capable of remotely receiving control commands and controlling said at least one additional hydraulic cylinder. In particular, the remote control and communication means are arranged on the chassis.

[0012] According to one feature, said at least one additional hydraulic cylinder is attached, on the one hand, to the chassis, and on the other hand, to each of the jaws. Preferably, the clamshell bucket has a single additional hydraulic cylinder that connects the two jaws and acts on both jaws simultaneously. In particular, the additional hydraulic cylinder extends in a (substantially) horizontal plane between the two jaws (direction perpendicular to the vertical direction of suspension of the clamshell bucket in its operating position). This arrangement makes it possible to use only one cylinder for both jaws and gains in compactness as well as reliability because the opening of the two jaws necessarily occurs simultaneously via a single mechanism.

[0013] According to one feature, the clamshell bucket comprises, between the swivel and the chassis (in particular at the swivel), a 360° chassis rotation drive system. This rotation drive system is powered by independent electrical supply means arranged on the chassis, and preferably the rotation drive system is magnetically coupled. Alternatively, the rotation drive system could be hydraulic. Preferably, the rotation drive system includes its own remote control and actuator receiver system. In particular, the independent electrical supply means power both at least one additional hydraulic cylinder and the chassis rotation drive system.

[0014] Advantageously, the chassis, which is capable of pivoting through 360° via the rotational drive system, allows the jaws to be positioned in the desired direction at any time. In particular, it is possible, while the clamshell bucket is moving back empty, to rotate it to anticipate the orientation of the jaws so that they can be positioned directly in the correct direction when they are about to grip the material to be loaded; the operator effectively saves logistical time.

[0015] According to another feature, the chassis comprises at least one platform, preferably at least two platforms (in particular tiered) on which are installed autonomous means of power supply, a hydraulic power unit for the operation of said at least one additional hydraulic cylinder, and means for remote control and communication of said at least one additional hydraulic cylinder. The platforms are integral with the chassis.

[0016] According to another feature, the jaws (which have a closing junction zone) cooperate in their closing junction zone by overlapping; one of the jaws is designed to fit inside the other jaw along its entire cooperation zone, providing a complete seal of the clamshell bucket in its closed state. The clamshell bucket is thus completely watertight. There is no risk of material being pinched between the two free edges of the jaws. There are no possible gaps through which material could fall during transshipment. Furthermore, the combination of this jaw overlap feature and the closing of the jaws (via hydraulic closing means) when the bucket is empty ensures that during the empty pivoting of the closed clamshell bucket, there is no risk of residual material falling out.

[0017] Preferably, the clamshell bucket includes a vibrating system that can be activated when the jaws are opened (in particular from a given opening angle), preferably the vibrating system being activated automatically and for a preset duration. The vibrating system contributes to accelerating the fall of the aggregates, eliminates any potential load splitting during the fall, and helps to detach agglomerates that, due to moisture, tend to remain stuck to the inner walls of the jaws.

[0018] Advantageously, the jaws have, in whole or in part, a non-stick inner surface, notably through a surface treatment or through the bonding of a non-stick coating such as Teflon or HDPE (high-density polyethylene) plates. This allows the material to be transferred, particularly when wet, not to adhere to the inside of the jaws and to detach itself when the jaws are opened.

[0019] Preferably, each jaw has on its outer surface a banding element made of an elastic material such as rubber, preferably a removable banding element. This banding element forms a raised feature on the outer circumference of the jaws, at least at the circumference with the largest cross-section. This helps to limit potential impacts on surrounding structures (for example, the hull and fittings of a ship) caused by sudden swaying of the hopper during transshipment operations. Indeed, damage caused by modern toadstools is significant on mid-sized ships. these are significant and represent substantial compensation costs for mining operators.

[0020] Furthermore, the clamshell bucket can be equipped with sensors and / or camera(s) which are connected to remote control and communication means arranged on the chassis, said remote control and communication means including means for processing the data received by the sensors and / or cameras and a transmitter for remotely transmitting the data.

[0021] The grab bucket of the invention can be used in various applications, in particular it is used for the maritime transshipment of ore.

[0022] In the following description the term "height", the qualifiers "upper", "lower", "high" and "lower" of an element of the clamshell bucket are used in the context of normal use of the clamshell bucket, that is to say relating to a vertical notion in relation to which the bucket is suspended at a height on a lifting device.

[0023] The present invention is now described by means of purely illustrative and in no way limiting examples of the scope of the invention, and from the accompanying illustrations, in which: - [Fig.1] represents a schematic front view of a clamshell bucket according to the invention in its closed position, and of its human-machine interface. - [Fig.2] corresponds to the clamshell bucket of [Fig.1] suspended from a hook of a lifting device and in its open position to dump bulk materials. - [Fig.3] is a side view of the clamshell bucket of [Fig.1].

[0024] The clamshell bucket 1 of the invention, also called a toad and illustrated in the figures, is intended to be suspended from a lifting device such as a crane to ensure its mobility and to carry out the transshipment of bulk materials such as ore.

[0025] The use of the grab bucket 1 relates in particular, but is not limited, to the maritime transshipment of ore from a barge or other temporary storage container to the hold of a mineral carrier 10 ([Fig.2] )•

[0026] The clamshell bucket 1 comprises a frame 2, a swivel 3 which is fixed to the frame at its upper end and includes a hooking element 30 such as a ring for its cooperation with the hook of the lifting device, two gripping jaws 40 and 41 (forming buckets) which are fixed to the frame 2 at its lower part and which are capable of opening and closing. The clamshell bucket 1 includes a system 2' for closing and opening the jaws under load. This system 2' for closing and opening the jaws under load is known in itself; it comprises traction cables 20 of the sling type and conventional hydraulic cylinders 21 (substantially vertical) with which the slings cooperate. The system 2' for closing and opening the jaws under load allows, with the jaws open being Placed on the ore pile, the system grips material as the jaws 40 and 41 close and are raised, then opens the jaws in mid-air to release the material. The jaw opening and closing system 2' under load can only close the jaws when they come into contact with a solid surface, particularly during material gripping and ore loading. The jaw opening and closing system 2' under load cannot close the jaws when empty or in a suspended position. According to the invention, the clamshell bucket 1 includes additional hydraulic actuation means 5 capable of closing the jaws 40 and 41 when empty and in a suspended position. The additional hydraulic actuation means 5 are also capable of opening the jaws 40 and 41 when empty.Part of the additional hydraulic actuation means 5 connect the chassis 2 to the jaws 40 and 41 and actuate the opening and closing of said jaws when the clamshell bucket is empty.

[0027] The clamshell bucket 1 also includes (self-contained) power supply means 6, remote control and communication means 7, and a wireless human-machine interface 8. Preferably, the clamshell bucket 1 further includes, as an interface between the swivel 3 and the frame 2, a rotation drive system 9 capable of rotating the frame 2 of the clamshell bucket 1 through 360°.

[0028] The chassis 2 carries the electrical power supply 6 and a hydraulic power unit necessary for the operation of the additional hydraulic actuation means 5. The electrical power supply 6 is self-contained and capable of supplying power to the additional hydraulic actuation means 5. The additional hydraulic actuation means 5 are thus self-contained without requiring electrical and / or hydraulic connections to the lifting equipment. The jaws 40 and 41 can be opened and closed remotely and on command via the remote control and communication means 7 and the wireless human-machine interface 8.

[0029] Thus, the clamshell bucket, which includes the additional hydraulic actuation means 5, ensures the closure (or re-closing) of the jaws 40 and 41 when empty, preventing material residue from falling out during the bucket's return when empty. Furthermore, because the chassis carries the electrical power supply means 6 and these are self-contained (as are the hydraulic actuation means), the clamshell bucket constitutes a self-contained device, ready for use without the need to connect external electrical and / or hydraulic cables, particularly from the lifting equipment, which would otherwise run along the swivel.

[0030] Furthermore, thanks to the rotating drive system 9, the clamshell bucket 1 can The clamshell bucket can be rotated to position the horizontal opening X-axis of the jaws as desired. This X-axis corresponds to the central axis perpendicular to the longitudinal gripping edges 42 of the jaws. This rotation can be performed both vertically when the clamshell bucket is lowered over the pile of ore to be loaded and during its descent to align the jaws directly in the desired direction, thus saving logistical time.

[0031] Consequently, the chassis 2 carries the system 2' for closing and opening the jaws under load and the additional hydraulic actuation means 5 for closing and opening the jaws when unloaded.

[0032] The system 2' for opening and closing the loaded jaws comprises slings 20 coupled to conventional hydraulic cylinders 21 that extend substantially vertically. The conventional hydraulic cylinders 21 cock (retract) when slack is given to the slings 20, and the jaws 40 and 41 close automatically as the ore is gripped and the jaws are raised by the lifting equipment (closure is triggered via internal connecting rods that are actuated by gravity when the grab bucket is raised). The conventional hydraulic cylinders 21 are capable of being actuated (extended) to open the full jaws 40 and 41, thus allowing the ore to be discharged above the hold of the ore carrier. The 2' system for closing and opening the jaws under load is not described further as it is known in itself.

[0033] The additional hydraulic actuation means 5 are mounted directly on the frame 2; they are self-contained and do not depend on the lifting device to open and close the jaws 40 and 41 when the clamshell bucket is empty. The additional hydraulic actuation means 5 comprise at least one additional hydraulic cylinder 50 and a hydraulic power unit 51. Said at least one hydraulic cylinder is preferably arranged in a horizontal plane, as shown in [Fig. 2], and connects the outer and upper parts of the jaws 40 and 41. Integrating at least one hydraulic cylinder in a horizontal plane saves space while ensuring efficient opening and closing. Said at least one additional hydraulic cylinder 50 pushes on the jaws 40 and 41 (which are empty) to open them and, by retracting, closes them (while they are empty).The hydraulic power unit 51 is supported by the chassis 2. The hydraulic power unit 51 is arranged on a platform above said at least one additional hydraulic cylinder 50 and jaws 40 and 41 ([Fig.2]).

[0034] The additional hydraulic actuation means 5 are electrically powered for their operation by the power supply means 6. The power supply means 6, which are self-contained, advantageously comprise one or more batteries. The chassis 2 carries the power supply means 6, which contributes to the autonomous operation of the clamshell bucket 1.

[0035] The frame 2 comprises one or more platforms 22 and 23 for supporting the hydraulic power unit 51, the electrical power supply means 6, and the remote control and communication means 7. The platform(s) 22 and 23 are fixed to the frame 2 by being positioned between the swivel 3 and the jaws 40 and 41. The platforms 22 and 23 are staggered. Preferably, the frame 2 includes slings 20 that connect the swivel 3 to a proximal portion 24 of the frame; the platform(s) 22 and 23 are arranged below this proximal portion 24. The frame 2 supports the jaws 40 and 41 in its lower part. The standard hydraulic cylinders 21 extend substantially vertically opposite the platforms 22 and 23.

[0036] The remote control and communication means 7 are capable of controlling the additional hydraulic actuation means 5 according to control commands received remotely. The remote control and communication means 7 comprise at least one receiver and its remote communication system, as well as data processing means. The power supply for the remote control and communication means 7 is preferably provided by the power supply means 6.

[0037] The wireless human-machine interface 8 communicates remotely with the remote control and communication means 7 to (in particular) control the additional hydraulic actuation means 5, in particular said at least one additional hydraulic cylinder 50. The operation of the human-machine interface 8 will be described later.

[0038] The remote control and communication means 7 may further include a transmitter for communicating data that would be processed by the data processing means of said remote control and communication means 7, if the clamshell bucket 1 is equipped with sensors and / or camera(s). Indeed, it may be useful in certain applications to optionally equip the clamshell bucket 1 with cameras, for example, to assist the operator in moving the bucket or to visualize the unloading location, and / or with sensors such as an anemometer for measuring wind during the use of the bucket and / or pressure sensors for monitoring additional hydraulic actuation means, etc. All this captured data is transmitted remotely via the transmitter of the remote control and communication means 7.

[0039] Furthermore, the clamshell bucket 1 includes the rotation drive system 9 capable of rotating the frame 2, and therefore the jaws 40 and 41, through 360° in one direction or the opposite direction. The rotation drive system 9 is independent of the hooking member 30. The rotation drive system 9 interfaces between the swivel 3 and the frame 2. Preferably, the rotation drive system 9 is magnetically coupled. The power supply for the magnetically coupled rotary drive system 9 is provided by the power supply means 6. Power supply cables run, for example, through or alongside the slings 20. The rotary drive system 9 preferably includes its own remote control and reception system 90. The human-machine interface 8 is capable of communicating with the remote control and reception system 90 to control the rotation of the rotary drive system 9.

[0040] The human-machine interface 8 is designed to be within easy reach of the operator. The human-machine interface 8 is wireless and includes a transmitter 80 that communicates remotely with the receiver of the remote control and communication means 7 (and with the remote control and reception system 90 of the rotary drive system 9). Preferably, it is a remote control with mechanically operated buttons. Alternatively, the human-machine interface may be a touchscreen tablet.

[0041] Preferably, the human-machine interface 8 comprises four control buttons ([Fig.1]): - a main opening control button 81; this main opening button activates the standard hydraulic cylinders 21 to open the skip when it is full, in order to unload (at a height) the cargo. This button is the only standard button on a typical clamshell bucket remote control. The main opening control button 81 is, for example, of the push-button type; - an additional open / close button 82; this additional open / close button allows the skip to be opened and closed even when empty. The additional open / close button 82 controls the opening and closing of said at least one additional hydraulic cylinder 50. It serves, firstly, to close the empty skip to prevent residual aggregates from falling during the skip's return from the vessel to the loading location, and secondly, to open the empty skip above the barge for reloading. The additional open / close control button 82 is, for example, of the push-button type; - Two additional buttons, 83 and 84, control the rotation of the drive system 9; one button allows rotation in one direction and the other in the opposite direction. These additional buttons, 83 and 84, are used to rotate the skip and orient the horizontal X-axis of the jaw opening as desired. The additional control buttons, 83 and 84, are push-button type.

[0042] Thus, in a very simple way with a minimum of four keys or buttons, The operator can remotely operate the clamshell bucket 1 by opening and closing the jaws 40 and 41 as desired and, if necessary, rotating the clamshell bucket on itself up to 360°, regardless of its location and including when it is suspended in the air.

[0043] According to a preferred embodiment, the jaws 40 and 41 cooperate in their overlapping closing junction zone 43, i.e., one of the jaws is designed to fit into the other jaw, providing a complete seal of the clamshell bucket in its closed state. Thus, there are no possible gaps through which material could fall during transshipment.

[0044] Advantageously, the clamshell bucket 1 may include a vibrating system 52 adapted to vibrate the jaws 40 and 41. The vibrating system 52 helps, in particular, to dislodge ore agglomerates that tend to remain stuck to the inner walls of the jaws. These agglomerates can represent up to 15% of the load contained in the jaws. Such a vibrating system is therefore particularly useful. The vibrating system 52 includes, for example, movable hammering elements adapted to strike the walls of the jaws 40 and 41 in a series of sharp impacts. The vibrating system 52 is preferably hydraulically operated and connected to the hydraulic power unit 51. The vibrating system 52 is powered by the electrical supply means 6. The vibrating system 52 is adapted (in frequency and duration) to the level of load that may remain stuck inside the jaws.Preferably, the vibration system is activated automatically when jaws 40 and 4L are opened. Alternatively, the vibration system 52 is activated automatically and / or can be controlled on demand. Preferably, the vibration system is activated for a preset duration. Preferably, the vibration system 52 is activated at the end of the jaw opening stroke, i.e., from a certain jaw opening angle, and the vibrations last only a few seconds.

[0045] Preferably, the jaws 40 and 41 have, in whole or in part, a non-stick surface 44 on their interior. This non-stick surface can result from a surface treatment or from the bonding of a non-stick coating, such as Teflon or HDPE plates.

[0046] Preferably, each of the jaws 40 and 41 has on its outer surface a strapping element 4 made of an elastic material such as rubber. This strapping element forms a raised feature on the outer circumference of each jaw, at least at the circumference with the largest cross-section. This helps to limit potential impacts on the hull and fittings of the vessel during transshipment operations.

[0047] The operation of the clamshell bucket 1 via the human-machine interface 8 is the following.

[0048] When the ore has been released into the hold of a bulk carrier by opening the jaws 40 and 41 via the main opening control button 81 and by activating the vibratory system 52 to maximize the detachment of any ore that may remain stuck to the jaw walls, the operator (referred to as the chainman or crane operator) closes the jaws 40 and 41 by pressing the additional control button 82 for opening / closing the empty jaws. With the empty jaws closed, the crane operator returns the grab bucket 1 to the temporary storage barge without risk of dropping any material into the sea between the bulk carrier and the barge.Simultaneously with the clamshell bucket 1 beginning its rotation towards the barge, the operator saves time by positioning the bucket directly in the desired gripping direction, rotating it through 360° using the additional control buttons 83 or 84 to turn the bucket in either direction. Once above the barge, the operator reopens the jaws 40 and 41 with the additional button 82 for opening / closing the empty jaws, while simultaneously lowering the clamshell bucket 1 until it comes against the ore to be loaded, the bucket already being oriented in the correct position to grasp the ore. The ore is picked up as usual by pressing the main control key 81 for closing / opening so that the jaws 40 and 41 close automatically as usual as the ore is picked up.Once the clamshell bucket 1 is loaded and the jaws 40 and 41 are closed, the crane raises the clamshell bucket 1 to the top of the bulk carrier 10's hold and opens the jaws via the main opening control button 81. A new cycle then begins: jaws closed empty, chassis possibly rotated, and jaws opened empty again. start again.

Claims

Demands

1. Grab bucket (1), particularly used for the maritime transshipment of ore, comprising a frame (2), a swivel (3), jaws (40, 41), and a system (2') for closing and opening the jaws when they are full, said system (2') comprising cables (20), and at least two hydraulic cylinders (21) which are dedicated solely to opening the full jaws, characterized in that it comprises at least one additional hydraulic cylinder (50) which is dedicated to closing the jaws (40, 41) when the jaws are empty, and to opening the empty jaws.

2. Clamshell bucket according to claim 1, characterized in that said at least one additional hydraulic cylinder (50) is self-powered in hydraulic and electrical energy within the clamshell bucket, the clamshell bucket comprising a self-powered hydraulic power unit (51) and self-powered electrical supply means (6), which are carried by the chassis (2) and are connected to said at least one additional hydraulic cylinder (50) for its operation.

3. Grab bucket according to claim 1 or 2, characterized in that it comprises remote control and communication means (7) of said at least one additional hydraulic cylinder (50), said remote control and communication means (7) being capable of remotely receiving control orders and of controlling said at least one additional hydraulic cylinder (50).

4. Grab bucket according to any one of the preceding claims, characterized in that it comprises a single additional hydraulic cylinder (50) which connects the two jaws (40, 41) and acts simultaneously on the two jaws, in particular, the additional hydraulic cylinder extending in a horizontal plane between the two jaws.

5. Grab bucket according to any one of the preceding claims, characterized in that it comprises between the swivel (3) and the chassis (2), a 360° rotation drive system (9) of the chassis, the rotation drive system (9) being powered by autonomous electrical supply means (6) which are arranged on the chassis, and preferably, the rotation drive system (9) is magnetically coupled.

6. Grab container according to any one of the preceding claims, characterized in that the jaws (40, 41) cooperate in their closing junction zone (43) by overlapping.

7. Grab bucket according to any one of the preceding claims, characterized in that it comprises a vibratory system (52) capable of being implemented when the jaws (40, 41) are opened, preferably the vibratory system (52) being implemented automatically and for a preset duration.

8. Grab bucket according to any one of the preceding claims, characterized in that the jaws (40, 41) have, in whole or in part, a non-stick inner surface (44), in particular via a surface treatment or via the bonding of a non-stick coating such as Teflon or HDPE plates.

9. Grab bucket according to any one of the preceding claims, characterized in that each of the jaws (40, 41) has on its outer surface a strapping element (4) made of elastic material such as rubber, preferably the strapping element being removable.

10. Grab truck according to any one of the preceding claims, characterized in that it is equipped with sensors and / or camera(s) which are connected to remote control and communication means (7) arranged on the chassis, said remote control and communication means (7) comprising means for processing the data received by the sensors and / or cameras and a transmitter for remotely transmitting the data.

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