FI120679B - Grasper and application of a gripper for lifting material web rolls, especially paper and cardboard rolls - Google Patents

Description

THE GRIPPERS AND THE APPLICANT'S APPLICATION FOR LIFTING ROLLS OF MATERIALS, IN PARTICULAR PAPER AND PAPERBOARD

The invention relates to a material web for gripping for lifting. The invention relates to the previous patent application FI20070030, which is not yet public at the time of filing this application.

Prior art is described in the aforementioned FI-10 application.

Due to, for example, the effect of wind loads on the bridge crane, the stacks in the warehouse do not become concentric with all the rollers. Due to the damage of the surface layers and for other reasons, a variable number of layers of film are "spooned" on some of the rolls. Therefore, the rolls from the same change can vary in diameter up to tens of millimeters upon entry into storage. The present vertical risers do not center the rolls in the stack 20, but one side of the roll surface of the rolls aligns substantially with the rolls of the stack. The opposite diaphragm surface accumulates a gradation due to the diameter variation of the rolls. The size of the diameter and the variation are staggered on one page. In addition to the 25 mentioned above, there are still inaccuracies in the operation of the crane. The combined effect of all these factors on the stock piles is the radial gradation of the rolls up to several centimeters.

30 How a dense matrix can be stacked in a vertical warehouse has economic significance. The extra space between the stacks causes additional costs through the wider reach of the bridge crane and the larger building area.

If there is a need to locate structures in the gripper that extend below the roller / roller during transfer, this reduces the space utilization efficiency because more space has to be provided above the storage piles for the horizontal movement of the crane. It is therefore desirable that the grip during the transfer can be secured without securing structures extending below the lower roller.

FR 2859197 describes as such a secure solution for keeping the movable object in a secure position during transfer. The solution is suitable for a standard-sized container, but less well for a roll of paper, the position of the lower end of which may vary within wide limits, extending from 0.3 to 4.5 m below the gripping area. Scissor type grippers are described on the Bushman 15 Equipment Inc. website at www.bushman.com/prod tgrab broch.asp. These grippers are not suitable for handling a vertical roll of paper. The adhesion applies to a small area and damages at least the wrapper, possibly even the roll. 20 Also, it is not possible to transfer the gripping force far below the scissors.

The advantage of the scissor mechanisms is the automatic increase of the gripping force as the weight of the load increases. The solutions are also described in DE

3822228 and US 2959444. However, the mechanisms described are quite space-consuming solutions and the compression force is not optimal throughout the diameter range. FR 2699908 describes a wedge-like mechanism that engages the upper end of the roll.

A common feature of the known roll gripping grippers is that they are unable to convey sufficient gripping force down to the bottom.

However, reaching down is a necessary feature in order to transport multiple bundles of rolls simultaneously. If the gripping clamping mechanism is located above the roll / roll stack and the clamping force is shifted 2.5-3 meters lower, this results in such massive structures that it is not economically feasible to apply them.

Known clamp-type solutions also operate within a very limited diameter range. They are not capable of covering the 700 to 1600 mm range typical for paper roll production. With cardboard rolls, the area can be even larger.

It is an object of the invention to avoid or at least reduce the problems associated with adhesion.

15

The gripper according to the invention and the gripper application are characterized by what is set forth in the characterizing parts of the appended independent claims.

20

The solution of the invention can provide good adhesion by simple means. Because the weight of the load can increase the gripping force, the grip will automatically increase during transport if necessary. With the advantageous gripper design, the gripping force can be significantly altered with respect to the diameter and / or weight of the roll.

Various embodiments of the invention are set forth in the appended claims. It will be appreciated that inventions of various embodiments may be incorporated into inventions of various independent claims.

Figure 1 shows a gripper according to one embodiment of the invention in the open position.

4

Figure 2 shows the same gripper gripped on a roll stack.

Fig. 3 shows a gripper according to another embodiment of the invention, gripped in a roll stack.

A central idea of an embodiment of the invention is that the adhesive force on the contact members 4 10 of the gripper 2 clamping against the web roll 1a, Ib, le is achieved by providing, substantially at the height of engagement, one or more tensioners 18a, 18b which tensile stress causes the clamping force between the contact members 4 and the material web roll 1a, Ib, le 15. The bandage may rotate three or more contact members and / or the bandage may be attached to the edge of one or more contact members such that the contact member or its body forms part of the bandage. In the most preferred embodiment, the contact members are moon-20.

Fig. 1 illustrates an embodiment in which the bandage consists of levers 44abo, 44abl, which are preferably connected by means of hinges 43 to the lifting members 8a, 8b, 8c.

For example, the lever 44abo connecting the lifting members 8a and 8b is connected at one end to the nut 40a movable in the screw portion 41a of the lifting member 8a and to the lower bracket 42b secured at one end to the adjacent lifting member 8b. The lever 44abl 30, which is perpendicular to the lever 44abo, is connected at one end to the lower bracket 42a of the lifting member 8a and at the other end to the nut 40b movable in the screw portion 42b of the adjacent lifting member 8b. As the lifting member 8a pivots by the power unit 11a attached to the upper end of the lifting member, the nut 40a movable in the body 41a portion 41a of the lowering member moves vertically as the nut moves upwardly, the lever pairs rotate The power unit also attaches to the carriage 47 which, under the guiding of the guides 49 attached to the body 46, moves substantially in the radius 5 of the roll 1a, Ib, le. These form the transfer apparatus 50. Screw 41a is most preferably a ball screw.

The horizontal profile of bandage 18a, 18b is substantially polygonal, most preferably hexagonal 10

The transfer apparatus 50 may, of course, be implemented in other forms, known per se.

Fig. 3 illustrates an embodiment having two 15-arm ties 18a, 18b on top of each other.

Advantageously, the movement of one of the ties is transmitted via a screw and a nut, and from this to the other of the ties via the linking member 51.

In one embodiment of the invention, the upper contact members 18b are provided with upper contact members and the lower contact 18a are provided with lower contact members. With this embodiment, eccentric roll stacks can be centered. Hereby, the bindings 25 can move / tighten independently of one another in the direction of the radius of the roll, whereby the elasticity between the contact members is achieved, for example, by replacing the connecting member 51 with a power unit, spring, pneumatic or Naturally, there may be more than one bond to the contact member. The bindings can move / tighten relative to one another in the direction of the radius of the roll itself.

The contact members 4 based on the roll 1a are connected to the lifting members 8a, 8b via a support 45a. The nut 40a 6 preferably moves directly or indirectly on the support, leaning.

The joint lifting member 8a of the nut / upper joint 40a and the lower bracket / joint 42a 5 is provided with elastic members not shown. The resilient members allow the lower bracket 42a to move relative to the nut 40a while the roller 1a is engaged. Thus, the frictional roller tends to press down on the contact member 4a. The watering member, which at its lower end engages the lower bracket, transmits motion to the lower bracket, which tends to move downwards. Because the nut is locked in place, the downward movement of the lower bracket engages the clamping movement of the clamping levers. Most preferably, the elastic member is formed by a rubber or plastic sheet between the flanges of the movement members.

Electric, pneumatic or hydraulic power units can be used in the gripper's motion mechanisms. The nut 40a may also be located below the bracket 42a.

Various embodiments of the invention have been described above. It will be apparent to one skilled in the art that the invention 25 may be used by combining any of the above features. Thus, the present invention is limited only by the appended claims.

Claims (9)

1. Tag grippers for grabbing in standing material web rolls (1a, 1b, 1c), such as paper or cardboard rolls, for lifting them, characterized in that the tag gripper (2) is substantially at the tag gripping height for pressing of the roller (1a, 1b, 1c) contact means and a surrounding connector (18a, 18b) as well as means for generating a tension in the joint (18a, 18b) and means for converting the tension to a tension between the contact members ( 4) and the material web roller (1a, 1b, 1c). 2. Tag gripper according to claim 1, characterized in that the tag gripper comprises pouring arms 15 (8a, 8b), and the dressing (18a, 18b) consists of the eating element partially arranged between the pouring arms (44abo, 44abl) adapted at their ends movable with tension means say that by moving the ends of the cross-member arms in relation to the pouring arm in one direction, the joint is opened and by moving in another direction the joint is tensioned. Tag gripper according to any of the preceding claims, characterized in that the clamping means comprise a thread and a thread-adapted connection such as a nut and which arms at one end are fixed in a nut (40a) movable in the screw of the lifting member and in the the second end of an adjacent lifting member (42a). 30 4. The gripper according to any of the preceding claims, characterized in that in the tag gripper there is vertically adjacent one or more joints (18a, 18b). 35 5. A gripper according to any one of the preceding claims, characterized in that when the lifting member (8a, 8b) is rotated under the influence of a force member (11) fixed in the upper end of the lifting member, a lower part (41a) is moved in the lower end of the in the lifting member movable nut (40a) in the vertical direction, the arm pair being pivoted in the vertical plane so that the ring formed by the lifting means (8a, 8b) decreases and the grip is tensioned. 6. A gripper according to any one of the preceding claims, characterized in that, in conjunction with the nut / the upper link (40a) and the lower fastening member (s) (42a) in the common lifting member (8a), a suspension means is provided. which allow the movement of the lower bracket (42a) relative to the nut (40a) when the roller (1a) is gripped. 15 Tag gripper according to any of the preceding claims, characterized in that the upper contact means (18b) are located on the upper contact members and on the lower contact band (18a) the lower contact members, and that the cursor can relative to each other also independently moved / tensioned in the direction of the radius of the roller, the spring between the contact means being provided, for example, by replacing the connecting member (51) with a power device, spring, compressed air or hydraulic cylinders or with the corresponding spring means, which is joined between the ears (53) and (54). 8. A gripper according to any one of the preceding claims, characterized in that the screw (41a) is a ball screw. Use in the material conveyor roller's automatic transport system, characterized in that the system comprises a tag gripper according to any of the preceding claims 1 - 8.