EP0860395B1 - Electro-hydraulic self-propelled crane actuated by battery - Google Patents

Abstract

The vehicle engine crane comprises a base (A) consisting of a chassis with two spaced arms (1) on the ends of which are wheels (3). There are also two lateral stabilisers (32) which are adjustable, and a single drive wheel (4) mounted at the foot of a steering lever (5,6) by which the unit can be manoeuvred. Above the chassis there is a framework (8) made of tubular metal supporting a section (9) within which a structure (B) is articulated. This structure includes two supports (12,13) which in turn carry the main lifting arm (17) via articulated joints. The main arm is extended by two further sections (19,24). Energy is provided by two rechargeable batteries (36) powering an electro-hydraulic unit which operates a jack (33) to lift the crane jib.

Description

The subject of the present invention is a crane self-propelled electro-hydraulic powered by battery that can lift loads ranging up to 4000 kg when reaching an operational field particularly varied and large both in height and in the load-bearing relaxation, while keeping extremely small overall dimensions compared to its considerable work capacity.

There are self-propelled elevators used to lift different loads to heights preset which normally have performance limited and do not always guarantee precise and safe maneuvers, in addition to the fact that they have bulky dimensions and a purchase price Student.

Indeed, we are well aware of the needs that most diverse industries have to move heavy loads at different heights and / or at great distances from the point of removal of these.

It is also known that inside the premises corporate, intervention and maneuvers are often extremely limited and, for Therefore, lifting devices having very small overall dimensions and allowing, at the same time, to carry out maneuvers that can be controlled in one way precise and safe, with however the same technical characteristics and functional, are requested.

Another problem is that many self-propelled cranes are powered by internal combustion engines which, with their gases exhaust, pollute the environments of work especially if they are used to inside these first.

An electro-hydraulic self-propelled crane operated by a battery is already known from DE-A-3340437.

The main objective of this invention is to build a self-propelled electro-hydraulic crane powered by battery that can allow everything keeping overall dimensions extremely reduced, to lift loads up to 4000 kg when reaching a field particularly extended in height as in the carrying relaxation.

The other fundamental objective of this invention is to allow, using an articulated system to mobile and combined-effect fulcrum mount the crane arm with a diagram almost constant vertical curve.

Another objective is to allow the application another hydraulically operated "JIB" final arm on the crane head arm, as an alternative of the fixed extension arm.

Another object of this invention is to present a rollover prevention device special electromechanical with the property of check the stability conditions before reversal in all conditions of relaxation and / or load suspended with the variable pitch of the stabilizing telescopic frame.

Another object of this invention is to build a crane with a test bench hydraulic braking with progressive deceleration of the moving load whose functions become extremely important in terms of flexibility and autonomy.

Another object of this invention is to have a built-in battery recharge and two service batteries so placed appropriate and easily accessible.

Another goal is to build a crane highly competitive from a financial point of view by in relation to its technical characteristics and functional.

The following full description based on the drawings which are attached only as demonstration, clearly highlights the additional features of the machine in question.

• la fig. 1 présente une vue de perspective de la machine ;
• la fig. 2 est une vue de côté de la grue dans la position rabaissée ;
• la fig. 3 est une vue en plan de haut de la grue dans la position de repos ;
• la fig. 4 illustre la machine de côté, dans certaines positions d'utilisation, dotée du bras final de prolongement fixe
• la fig. 5 est une vue en plan de haut de celle-ci ;
• la fig. 6 est une vue frontale de l'invention ;
• la fig. 7 illustre la grue de côté dans certaines positions d'utilisation, dotée du bras final de prolongement à commande hydraulique ;
• la fig. 8 est une vue en plan de haut de la grue comme indiquée sur la fig. 7;
• la fig. 9 est une vue de côté du dispositif électromécanique anti-retournement ;
• la fig. 10 est une vue en plan de ce dispositif électromécanique anti-retournement ;
• la fig. 11 illustre un détail du dispositif comme indiqué sur les fig. 9 et 10 .

On the reduced and variable scale drawings:

• fig. 1 shows a perspective view of the machine;
• fig. 2 is a side view of the crane in the lowered position;
• fig. 3 is a top plan view of the crane in the rest position;
• fig. 4 illustrates the machine from the side, in certain positions of use, equipped with the final fixed extension arm
• fig. 5 is a top plan view thereof;
• fig. 6 is a front view of the invention;
• fig. 7 illustrates the side crane in certain positions of use, equipped with the final extension arm with hydraulic control;
• fig. 8 is a top plan view of the crane as shown in FIG. 7;
• fig. 9 is a side view of the electromechanical anti-rollover device;
• fig. 10 is a plan view of this electromechanical anti-rollover device;
• fig. 11 illustrates a detail of the device as indicated in FIGS. 9 and 10.

In these figures, the fundamental organs of machine are identified by the letters of the alphabet.

In fig. ranging from 1 to 6 of the identified drawing by the letter -A-, is indicated the basic carriage consisting respectively of a chassis with arms separated 1 with telescopic extensions 2 equipped with front wheels 3, two stabilizers side 32 mechanically adjustable by screws and a hydraulic drive wheel 4 protected by a mudguard 4a and controlled by a rudder 5 directional with a keyboard 6 to operate the drive unit which is equipped with braking automatic and a "punch" button 7 for emergency stop.

The supporting tubular structure 8, at the end tapered 9 of which are the two axes of fixing, respectively 10 and 11, of the system articulated with mobile fulcrum -B- consisting of two pairs of levers, 12 and 13 which have, at points 15 and 16, the head 14 of the arm 17 fixed to their opposite ends, part of said carriage -A-en being integral with it.

The arm 17, rigidly secured to the head 14, extends to roller 18 which makes it possible to make slide the telescopic arm 19 using the cylinder 20 secured to arm 17 and fixed respectively at this one at 21 and at point 22, at telescopic arm 19 at the end of which is fixed the adjustable hook 23.

Another fixed extension arm 24 fixed at 25, provided with an adjustable hook 26 at its end, can be inserted at the end of the arm telescopic 19.

Said arm 24 can be closed by doing so rotate around its own axis 25 until that it takes the rest position 24a.

In accordance with the invention, with reference to FIGS. 7 and 8, the application is illustrated, as alternative use of the fixed arm of extension 24, of an extension arm additional -C- "JIB" hydraulically operated consisting of a box arm 27 fixed to the axis 25 of the telescopic arm 19 whose angular movement is supplied by the cylinder 28 engaged at 29 always to the telescopic arm 19 and acting on the arm 27 at the point of force 30 and endowed with a swivel hook 31.

The crane lifting thrust is provided by the cylinder 33, fixed at 34 on the tubular structure 8, which discharges virtually across the axis 35 of arm 17 in the articulated system -B- so to cause the rise of arm 17 with a diagram with almost constant vertical curve.

On the two opposite sides of the supporting structure 8, the pair of batteries 36 is placed and on the rear front part thereof, are advantageously placed the recharging device batteries 37 and the control panel 38.

The hydraulic braked test bench -D- with progressive deceleration of the moving load which allows controllable maneuvers, precise and safe, is also placed in the supporting structure.

Referring to fig. 9, 10 and 11, the device electromechanical anti-rollover consisting of pair of forks 39 arranged horizontally for compensate for traction and coupled forces parallel by means of fixing respectively from the ends 40 to the structure 8 of the crane and ends 41 to the group of the drive wheel 4, is indicated by the letter -E-.

The dynamic link between the driving wheel 4 and the bearing structure 8 of the crane is contrasted by a preloaded spring 42 with the adjusting screw 43 blocked with a lock nut 44.

A microswitch 45 intercepts movement vertical with the feeler 46 carrying a signal electric instant stop movements of the crane.

The operation of the above -E device which takes into account the trigger, the suspended load and the variable pitch of the telescopic frame 1, is based on the principle of existing minimum balance between the security charge present in the group of the driving wheel 4 and the movement of overall reversal of the crane that during the possible overrun phase, the feeler 46 reacts by using microswitch 45 intended to block, with a distribution bench electric, lifting operation, exit from telescopic arm 19 and translation into only allowing the load to return in order to restore the minimum stability conditions operational.

In fig. 4 and 7, some are represented numerous working positions in space that the crane can take with the conditions of crane equipped respectively with an arm of fixed extension 24 and an extension arm to hydraulic control 27 and only for of example and without limitation.

• levage de charges importantes avec un champ opérationnel vaste en hauteur comme dans la détente;
• dimensions d'encombrement extrêmement réduites ;
• fonctionnement à batterie avec système de recharge des batteries incorporé et les deux batteries de service placées dans un endroit facilement accessible ;
• système articulé spécial à point d'appui mobile et à effet combiné, pour le levage de son bras avec un parcours vertical presque constant ;
• possibilité d'appliquer un bras de prolongement à commande hydraulique "JIB" sur la tête du bras télescopique de la grue comme choix alternatif du bras de prolongement fixe ;
• dispositif anti-retournement électromécanique spécial permettant de contrôler les conditions de stabilité par rapport au retournement dans toutes les conditions de charge ;
• banc de contrôle à freinage hydraulique avec décélération progressive de la charge en mouvement.

The performance of the machine described can thus be summarized:

• lifting of large loads with a wide operational field in height as in the trigger;
• extremely small overall dimensions;
• battery operation with built-in battery recharging system and the two service batteries placed in an easily accessible location;
• special articulated system with movable fulcrum and combined effect, for lifting his arm with an almost constant vertical path;
• possibility of applying a hydraulically controlled extension arm "JIB" to the head of the telescopic crane arm as an alternative to the fixed extension arm;
• special electromechanical anti-overturning device allowing to control the stability conditions compared to the overturning under all load conditions;
• Hydraulic braking control bench with progressive deceleration of the moving load.

Claims (7)

1. Battery operated electrohydraulic self-propelling crane to lift loads with a structure comprising a base trolley (A) consisting respectively of a bogie truck with spread-out arms (1) with telescopic extensions (2) provided with front wheels (3), with two adjustable lateral stabilizers (32), whereby the energy is supplied to the crane by two rechargeable batteries (36) with a battery charging device (37), whereby the whole depends on a control desk (38), characterized by a hydraulic main wheel (4) controlled by the directional rudder (5) provided with a control keyboard (6) for the translation unit on which a tubular structure (8) rests which carries an articulated system with a movable bearing point (B) to which an arm (17) is fixed with a lifting thrust due to a cylinder (33), arm at the end of which a roller (18) is placed for the gliding by means of a cylinder (20) of a telescopic arm (19) which carries at its end an orientatable hook (23) which can be equipped with another extension arm which can be either fixed (24) or with a "JIB" hydraulic control (C), whereby both of them are provided at their end with an orientatable hook (26, 31), the movements being adjusted by a waterbrake control stand (D) with progressive deceleration of the moved load and by an electromechanical reverse lock (E).
2. Electrohydraulic self-propelling crane according to claim 1, characterized in that the hydraulically controlled "JIB" extension arm (C ) comprises a caisson arm (27) fixed to an axle (25) of the telescopic arm (19), the angular movement of which is provided by a cylinder (28) fixed to an axle (29) of the telescopic arm itself (19) and acts on the caisson arm (27) in a point of application (30) and provided at its end with an orientatable hook (31).
3. Electrohydraulic self-propelling crane according to claim 1, characterized in that all its movements are adjusted by the waterbrake control stand (D) with progressive deceleration of the moved load.
4. Electrohydraulic self-propelling crane according to claim 1, characterized in that the electromechanical reverse lock (E), based on the minimal equilibrium principle existing between the safety load being in the main wheel unit (4) and the global crane reverse motion consists in a pair of forks (39) coupled in parallel by means of a fixing means of their ends (40, 41) respectively to the structure (8) of the crane and to the main wheel unit (4), the dynamic link of which is compensated by a preloaded spring (42), and the vertical movement is taken up by a microswitch (45) by means of a feeler (46) which emits an electric signal for the instant stop of the movements of the crane.
5. Electrohydraulic self-propelling crane according to claim 1, characterized in that the base trolley (A) has a bogie truck with spread-out arms (1) with telescopic extensions (2) provided with front wheels (3) and with two mechanically adjustable lateral stabilizers (32).
6. Electrohydraulic self-propelling crane according to claim 1, characterized in that the two batteries (36) are advantageously placed on the opposite sides of the bearing structure (8).
7. Electrohydraulic self-propelling crane according to claim 1, characterized in that the crane is provided with a battery charging device (37) advantageously placed on the rear front part of the bearing structure (8) with the control desk (36).

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