FR2836408A1 - Rotating support to allow welding of vessels or containers, uses fixed and adjustable headstocks with radial arms having sliding blocks that grip the vessel which can then be raised and located to optimum welding position - Google Patents

Abstract

The support has a fixed motorized headstock (A) and an adjustable headstock (B). Each headstock carries a grip with radial arms carrying sliding blocks that are extendable so the blocks fit over the sides of the vessel. The shaft supporting the grips can be raised hydraulically to lift the vessel to the working height. The rotary motors are driven hydraulically through solenoid valves.

Description

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 The device according to the invention is a tacker-positioner specially designed for the welding of tipper boxes of rectangular or semi-rounded shape of all sizes and lengths.

 Its originality lies in its ability to grasp a box at both ends using two specific grippers with quick clamping and adjustment, to lift horizontally and to rotate it sequentially to optimize the positions of the faces to be welded from the ground by the welders.

 There are already known tackers for welding tanks or silos of revolution shape. They are used for mechanized welding on circular joints, the cylinder being driven by motorized wheels arranged on the ground.

 Other systems exist for welding large parts. These are wheels inside which these large parts are fixed.

 There are also rotation systems using "rotators" suspended from an overhead crane and straps which are passed around the parts to be turned and which are driven by the rotator pulleys. Their implementation is very long and supposes a very significant immobilization of the overhead crane.

 Other systems have been imagined or produced, using a large frame surrounding the bucket and rotated on so-called "Center pointe" tacking systems.

 These devices totally lack flexibility.

 The difficulty in welding buckets lies in the diversity of their shapes and dimensions.

 It is very important to be able to have a system offering great flexibility of adaptation to all dimensional configurations; also the possibility of lowering the center of gravity as close as possible to the ground in order to improve access to the welder and reduce the arduousness of tasks as well as the risk of accidents.

 The device according to the invention eliminates all these drawbacks which are not exhaustive.

 It consists of a fixed headstock (A) motorized and a movable headstock (B) mounted on wheels. Each headstock has rails in which a slide (E and F) is actuated by two double-acting cylinders (H). These cylinders are fitted with balancing and blocking valves. They are synchronized to raise the perfectly horizontal axis of rotation.

 The headstock slide (E) supports the hydraulic gear motor (G). The reduction gear is with double planetary gear trains; it is powered by an orbital hydraulic motor fitted with a disc brake ensuring locking by lack of pressure. The speed is variable from zero to one revolution per minute.

 The front gripper (C) is designed to receive the bucket in the inverted position. It is directly attached to the motor shaft.

 The two forks (1) support the body by the front panel. They slide in the sleeves (2) and are keyed according to the center of gravity determined in advance, specific to each bucket. Vertical tightening is done using handwheels (3) which act on square-pitch screws. The sleeves (4) are provided with arms (5) adjustable and keyed according to the type of crosspiece.

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 The lateral tightening is ensured by the handwheels (6) which act on square pitch screws. The sleeves (7) are provided with a clamp provided with an adjustable claw (8).

They maintain the body of the body by resting on the front posts.

mobile (8). Il est rapproché de la caisse pour la saisir par la traverse arrière. The posterior gripper (D) is flanged on the doll's bearing shaft

mobile (8). It is brought closer to the body to grab it by the rear crossmember.

 The bottom of the bucket rests on the jaws (9), the height of which is adjusted by the handwheels (10).

 Vertical tightening is achieved by the handwheels (11) acting on the screws and the upper jaws (12). The lateral tightening is done by the handwheels (6).

The claws (8) integral with the sleeves (7) hang on the rear posts of the body.

Principle of operation:
When the bucket is thus tightened by the two grippers, the operator makes a total ascent by acting on the buttons on the control panel. The body can only be rotated under this express condition.

 When the position of the body is reached, the operator lowers it to the lowest point of the ground in order to find the best comfort and secure the work.

 The site is protected by light curtains preventing any movement of the machine in the event of an intrusion into the evolution area.

Claims (6)

1-Device for turning and positioning tipper bodies of all sizes for manual or mechanized arc welding, characterized in that it consists of a fixed motorized headstock (A) and a movable headstock free (B) equipped with adjustable grippers (C and D).  2 - Device according to claim 1 characterized in that the height of the axis of rotation is synchronized and adjustable at will.  3 - Device according to claim 1 characterized in that the grippers (C and D) are designed to accommodate all the dimensional configurations of the tipper bodies to ensure rapid and secure tightening.  4-Device according to claim 1 characterized in that the front gripper (C) provides a grip at four points on the front face. The rear gripper (D) provides a four-point grip on the rear face of the body.  5 - Device according to claim 1 characterized in that the grippers allow fine adjustment of the center of gravity of the bucket relative to the axis of rotation.  6 - Device according to claim 2 characterized in that the height adjustment allows positioning of the bucket as close to the ground to improve access to the joints to be welded and the safety of welders.