AU2020214673A1

AU2020214673A1 - Clamping and lifting device

Info

Publication number: AU2020214673A1
Application number: AU2020214673A
Authority: AU
Inventors: Marc Roman Büdenbender; Michael Götz
Original assignee: Siemag Tecberg GmbH
Current assignee: Siemag Tecberg GmbH
Priority date: 2019-01-30
Filing date: 2020-01-20
Publication date: 2021-08-05
Also published as: WO2020156856A1; DE102019102285A1; CA3127282A1; ZA202104978B

Abstract

Clamping and lifting device for use in shaft hoisting systems, having a supporting structure and a lift frame which is displaceable thereon and on which there are arranged two clamping blocks that are movable from a parked position into a working position, are provided with gauges, and are active in both loading directions, wherein the movement of all of the elements of the clamping and lifting device, in particular also that of the gauges necessary for rope clamping, is realized by means of electrical drives.

Description

Title: Clamping and lifting device

[001] The present application relates to a clamping and lifting device for use in shaft hoisting systems, comprising a supporting structure as well as a lifting frame displaceable thereon, on which two clamping blocks are arranged which are movable from a parking position into a working position, are provided with calibers and are effective in both load directions, as described by the patent claims.

[002] In shaft hoisting technology, clamping and lifting devices have been used for a long time either to carry out maintenance work on the rope harnesses, hoisting equipment or the hoisting machine itself, or to place or change the hoisting ropes on the hoisting machine.

[003] Clamping and lifting devices are generally equipped with hydraulic cylinders for both the clamping mechanism and the lifting drive. In order for the clamping and lifting device to perform the desired work, it must first be moved from the parking position into the working position. For this purpose, simple mechanical aids or a hydraulic displacement device are often used.

[004] In principle, the use of hydraulic cylinders always entails the need for a hydraulic unit, which requires space at the installation site. This leads to undesirable fire loads in the conveyor system. The use of non-burning fluids also generates wear on the hydraulic components, so this solution is not available to avoid the fire load.

[005] It is therefore the object of the present invention to provide a clamping and lifting device of the generic type which remedies these disadvantages, and which is as simple and economical as possible to assemble, operate and maintain.

[006] This object is solved by the features of independent patent claim 1, wherein advantageous embodiments are described by the features of the dependent patent claims.

[007] In accordance with the invention, a clamping and lifting device is provided for use in shaft hoisting systems, having a supporting structure and a lifting frame which can be displaced thereon and on which two clamping blocks are arranged which can be moved from a parking position into a working position, are provided with calibers and are effective in both load directions, the movement of all elements of the clamping and lifting device, in particular also that of the calibers required for rope clamping, being realized by means of electric drives. The substitution of all hydraulic cylinders by electric drives completely eliminates the fire load.

[008] The clamping and lifting device according to the invention is preferably characterized in particular by the fact that the electric drives are designed as spindle drives, electric cylinders or electric displacement devices.

[009] Another preferred feature of the clamping and lifting device according to the invention is that guided cross members which can be moved up and down are arranged above and below the respective clamping block, in which cross members coupling elements are mounted which are connected to the calibers in the respective clamping block and act on them. Spring elements are also preferably provided on the coupling elements to maintain a residual force on the calibers in the clamping block after the required clamping force has been reached and the drive moving the cross members has been switched off. Preferably, the drive moving the cross members is a screw jack.

[010] For the first time, the calibers of the clamping and lifting device, which clamp the ropes and ensure load take-up, are not pretensioned hydraulically but exclusively by means of electric drives. Since the calibers usually trail a little during load transfer because the rope cross-section is slightly reduced and the rope is also crushed depending on the rope type, the trail must be ensured mechanically without losing the complete application force of the calibers to the ropes. Hydraulic cylinders can easily remain permanently pressurized and therefore trail with constant force. Electric drives do not offer this option. The spindle drive now applies the required clamping force for all calibers and simultaneously preloads the spring elements. Once the required clamping force is reached, the spindle drives switch off and the spring elements maintain the force. When the load is transferred to the clamping blocks, the calibers are further retracted by the ropes; in the process, the spring elements release parts of the stored energy and thus maintain a residual force on the calibers.

[011] According to the invention, it can also be provided that electric displacement devices are provided for moving the clamping blocks into the working and parking position.

[012] The present invention makes it possible for the first time to completely dispense with a hydraulic unit in a clamping and lifting device with load pickup in both load directions. The synchronization of electric drives is easier to realize than with hydraulic cylinders and much more precise, therefore higher lifting speeds can be achieved with simple measures. The tolerable low temperatures of hydraulic and electric clamping and lifting devices are comparable (on the shelf 0 C), but an electric clamping and lifting device advantageously is always ready for immediate use, whereas hydraulic fluids have to be warmed up before they are ready for operation.

[013] Further features and advantages of the present invention will become apparent from the following, purely illustrative and in no way limiting, description of a preferred embodiment of the invention with reference to the accompanying figures; shown therein is:

[014] Fig. 1 a perspective view of an embodiment of the clamping and lifting device according to the invention;

[015] Fig, 2 a detailed view of a lifting device of the clamping and lifting device according to Fig. 1;

[016] Fig. 3 a detailed view of the front side of a clamping block of the clamping and lifting device according to Fig. 1;

[017] Fig. 4 a detailed view of the rear side of the clamping block of the clamping and lifting device according to Fig. 3; and

[018] Fig. 5 a detailed view of the clamp block displacement of the clamping and lifting device according to Fig. 1.

[019] Fig. 1 is a perspective view of an embodiment of the clamping and lifting device 2 for use in shaft hoisting systems according to the invention. As can be seen from Fig. 1, this firstly comprises a supporting structure 4, which in the embodiment shown is a steel construction in the form of a portal, which has cross members 8 resting on uprights 6, the uprights 6 at the same time serving as guides or suspension lugs for a lifting frame 8, which can move up and down guided on the uprights 6. The up and down movement of the lifting frame 9 is provided by a lifting device 10, the details of which are described further below. As can be seen in Fig, 1, in the embodiment shown, two clamping blocks 12 are arranged on the lifting frame 8, which are effective in both load directions and can be moved on the lifting frame 8 from a parking position to a working position by means of clamping block displacement unit 14. As can be seen from Fig. 1 moreover, the clamping blocks 12 are provided with guided clamping cross members 16 arranged above and below the respective clamping block 12 and movable up and down, in which coupling elements connected to and acting on (not shown) calibers in the clamping block 12 and described further below are mounted. Finally, as can be seen from Fig. 1, the movement of all the elements of the clamping and lifting device 2 shown is realized by means of electric drives 26, 46, 54, which completely eliminates the fire load as would be present with the use of conventional hydraulic components for moving the elements.

[020] Fig. 2 shows a detailed view of a lifting device 10 of the clamping and lifting device 2 according to Fig. 1. A drive motor 26 fixed to a suspension 24 can be seen. This acts on a threaded spindle 28, which is mounted at the lower end in a floating bearing 30 and at the upper end in a fixed bearing 32 fixed to the suspension 24. As can be seen in Fig. 2, a spindle nut 34, through which the threaded spindle 28 is guided, is arranged in the lifting frame 9 to prevent it from rotating. Depending on the direction of rotation of the drive motor 26, the threaded spindle 28 raises or lowers the lifting frame 9 via the spindle nut 34.

[021] Fig. 3 shows a detailed view of the front side of a clamping block 12 of the clamping and lifting device 2 according to Fig. 1. As can be seen, the clamping block 12 in the embodiment shown consists of a welded construction, which is provided on the front side with clamping devices 36 for (not shown) ropes. As can be seen, clamping cross members 16 are provided above and below the respective clamping block 12, which are guided on guides 38 and can be moved up and down. As can further be seen, coupling elements 40 connected to and acting on (not shown) calibers in the clamping block 12 are mounted in these clamping cross members 16. Spring elements 42 are provided on the coupling elements 40 to maintain a residual force on the (not shown) calibers in the clamping block 12 after the required clamping force has been reached and the drive moving the clamping cross member 16 has been switched off.

[022] Fig. 4 shows a detailed view of the rear side of the clamping block 12 of the clamping and lifting device 2 according to Fig. 3. Identical elements as in Fig. 3 are provided with identical reference signs. Fig. 2 clearly illustrates the drive for the clamping cross members 16, which, as can be seen, consists of two threaded spindles 44 acting on the clamping cross members 16. The threaded spindles 44 are driven by cardan shafts 48 set in rotation by a drive motor 46 via two bevel gears 50, whereby the clamping cross members are moved upwards or downwards together, depending on the direction of rotation of the drive motor 46, and act on the calibers (not shown) in the clamping block 22 via the coupling elements 40 and the spring elements 42 connected thereto.

[023] Finally, Fig. 5 shows a detailed view of the clamping block displacement 14 of the clamping and lifting device 2 according to Fig. 1. In addition to elements already known from the previous figures, it can be seen in Fig. 5 that the clamping block displacement 14 in the embodiment shown comprises an electric displacement device 52, which is connected to a drive motor 54 via a gear 56. The electric displacement device 52 is thereby articulated to an extension arm 58 of the clamping block 12 arranged displaceably on the lifting frame 9, whereby the clamping block 12 is moved into or out of a working position into or out of a parking position depending on the direction of rotation of the drive motor 54 on the lifting frame 9.

Claims

1. Clamping and lifting device for use in shaft hoisting installations, having a supporting structure and a lifting frame (9) which can be displaced thereon and on which are arranged two clamping blocks (12) which can be moved from a parking position into a working position that are provided with calibers and are effective in both load directions, characterized in that the movement of all the elements of the clamping and lifting device (2), in particular that of the calibers required for rope clamping, is realized by means of electric drives.

2. Clamping and lifting device according to claim 1, characterized in that the electric drives are designed as spindle drives, electric cylinders or electric adjustment devices.

3. Clamping and lifting device according to claim 1 or 2, characterized in that above and below the clamping blocks (12) guided clamping cross members (16) are arranged which can be moved up and down and in which coupling elements (40) connected to and acting on the calibers in the respective clamping block (12) are mounted.

4. Clamping and lifting device according to claim 3, characterized in that spring elements (42) are provided on the coupling elements (40) for maintaining a residual force on the calibers in the respective clamping block (12) after the required clamping force has been reached and the drive (46) moving the clamping cross member has been switched off.

5. Clamping and lifting device according to claim 3, characterized in that the drive moving the clamping cross members (16) is a screw jack.

6. Clamping and lifting device according to one of the preceding claims, characterized in that electric adjustment devices (52) are provided for displacing the clamping blocks (12) into the working and parking position.

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Fig. 1

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Fig. 2

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Fig. 3

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Fig. 4

5 /5 Clamping Block Displacement

Fig. 5