DE29608293U1 - Drive sprocket for continuous chain conveyors in mining - Google Patents

Description

PATENT ATTORNEYS \ \'.'\ . II*". . ' ..fclstenieichen:

CONRAD KÖCHLIN©·"··* '··*···' ··"*·*■

DlPL-ING. CON RAD-JOACHIM KÖCH LI NG Michael Wollbrecht

Zum Nordhang P. O. Box 2069, D-58020 Hagen FleyerStraße 135, D-58097 Hagen _Il_£i£__f £_f £_f

Call (02331) 811 64 + 85033

Fax(02331) 84840

Telegrams: Patentköohling Hagen Accounts: Commerzbank AG, Hagen 3515095 (BLZ45040042) Sparkasse Hagen 100012043 (BLZ45050001) Postgiro: Dortmund 5989-460 (BLZ 44010046)

58 51
VNR:

12121/96
Current Nn

7 May 1996
from the

CJK/Bo.

Drive sprocket for continuous chain conveyors in mining

The invention relates to a drive sprocket for continuous chain conveyors in mining, consisting of two sprocket sections with radially directed separation points, wherein the sprocket sections have axial extensions that can be connected by means of tangentially directed connecting screws.

Such split drive sprockets are known in the art.

In the current state of the art, tangentially directed connecting screws are provided at the separation points on axial extensions of the sprocket sections (six on each side). Since the separation point cannot be brought into contact with a gap-free surface, but

Wollbrecht 12121/96

-2-

As a rule, a gap of approx. 0.4 mm remains and the forces acting on the sprocket are significant at a normal rotational speed of 60 revolutions per minute, it often happens in the current state of the art that the connecting screws break off due to the elastic bending of the sprocket at the point of separation. When the chain, which is in engagement with the drive sprocket, is subjected to a load, the respective segment at the point of separation lifts off by approx. 0.5 mm, which results in the connecting screws breaking off.

This leads to constant disruptions in operations, which causes high downtimes and thus considerable cost disadvantages.

Based on this state of the art, the invention is based on the object of creating a drive sprocket of the generic type which can withstand the forces occurring without breaking the connecting screws.

Wollbrecht 12121/96

-3-

To solve this problem, it is proposed that key-like means are inserted into the separation point of the sprocket parts, which bridge the separation gap.

Preferably, the key-like means consist of bolts arranged at each separation point, which are inserted into matching recesses directed parallel to one another and parallel to the joining direction of the parts.

It is particularly preferred that the key-like means consist of profile bars, in particular of square or rectangular cross-section, which engage in recesses in the two parts that are axially parallel to the sprocket axis, the direction in which the profile bars are inserted into the recesses running parallel to the direction in which the parts are joined together.

The profile bars are aligned with their longitudinal axis parallel to the sprocket axis in order to achieve the greatest possible support effect.

Wollbrecht 12121/96

-4-

In addition, it is preferably provided that the key-like means can be inserted into a recess in the two sections in each case at half of their cross section or length.

It is also particularly preferred that the key-like means are arranged in the toothed central part of the chain wheel.

In addition, it can be provided that the key-like means have disassembly aid screws by means of which they can be pushed out of the snug fit of the recess.

The design according to the invention (arrangement of feather keys in the area of the separation points, particularly in the middle area of the chain wheel) prevents the separation point from bending when the chain is loaded. The effect that occurs in the prior art, that the chain wheel sections at the separation point bend when rotating

Wollbrecht 12121/96

-5-

The arrangement of the key-like means in the separation point prevents the connecting screws from lifting off. This means that the connecting screws are largely relieved of bending forces and are mainly only subjected to tensile stress, so that the risk of the screws breaking off is largely eliminated.

The arrangement of disassembly aid screws makes it easier to remove the key-like means, whereby the disassembly aid screws can simultaneously serve to pre-fix the key-like means to one of the two sprocket parts (segments).

When arranging bolt-like elements as key-like means, the arrangement of several such bolts at each separation point is preferred.

An embodiment of the invention is shown in the drawing and described in more detail below.

Wollbrecht 12121/96

-6-

It shows:

Fig. 1 a drive sprocket in side view, partially broken away;

Fig. 2 the sprocket in front view, partially broken open or cut.

The drive sprocket for continuous chain conveyors in mining shown in the drawing consists of two sprocket parts (segments) 1, 2 with radially directed separation points 3. The sprocket parts have axial extensions 4 on both sides of the central area, which can be connected using tangentially directed connecting screws, which is indicated at 5. In order to prevent these connecting screws from breaking off during operation of the sprocket, key-like means 4 are inserted into the separation point to prevent the elastic bending of the segments at the separation point 3. For this purpose, in the example, profile bars of square

Wollbrecht 12121/96

-7-

Cross-section as key-like means 4, which engage in recesses 6,7 of the two sections 1,2, which are parallel to the sprocket axis 5, at the separation point. The direction of use of the profile bars 4 is parallel to each other and parallel to the joining direction of the sections 1,2, so that the sections can be joined together by parallel displacement and the key-like means 4 engage in the corresponding recesses 6,7 with a snug fit. The key-like means 4 each sit half of their cross-section in the recess 6 of one segment 1 and in the recess 7 of the other segment 2. The key-like means 4 are arranged in the middle part of the sprocket provided with teeth. In addition, the key-like means 4 can have disassembly aid screws 8, by means of which they can be pushed out of the fit of the corresponding recess (in the embodiment of the recess 6).

Wollbrecht 12121/96

The invention achieves in a simple manner and without great effort that bending of the segments 1,2 in the area of the separation point is avoided, so that the risk of the connecting screws 5 breaking off is significantly reduced, if not completely eliminated.

The invention is not limited to the embodiment, but is variable in many ways within the scope of the disclosure.

All new individual and combination features disclosed in the description and/or drawing are considered essential to the invention.

Claims (6)

Wollbrecht 12121/96 -9- Protection claims: 1. Drive sprocket for continuous chain conveyors in mining, consisting of two sprocket sections with radially directed separation points, the sprocket sections having axial extensions which can be connected by means of tangentially directed connecting screws, characterized in that key-like means (4) which bridge the separation joint are inserted into the separation point (3) of the sprocket sections (1, 2). 2. Drive sprocket according to claim 1, characterized in that the key-like means (4) consist of bolts arranged at each separation point (3) which are inserted into matching recesses (6,7) directed parallel to one another and parallel to the joining direction of the parts (1,2). Wollbrecht 12121/96 -10- 3. Drive sprocket according to claim 1, characterized in that the key-like means (4) consist of profile bars, in particular of square or rectangular cross-section, which engage in recesses (6,7) of the two parts (1,2) which are axially parallel to the sprocket axis (5), the direction of insertion of the profile bars into the recesses (6,7) running parallel to the direction in which the parts (1,2) are joined together. 4. Drive sprocket according to one of claims 1 to 3, characterized in that the key-like means can be inserted into a recess in each of the two parts by half of their cross section or their length. 5. Drive sprocket according to one of claims 1 to 4, characterized in that the key-like means (4) are arranged in the toothed central part of the chain wheel. Wollbrecht 12121/96 -11- 6. Drive sprocket according to one of claims 1 to 5, characterized in that the key-like means (4) have disassembly auxiliary screws (8) by means of which they can be forced out of the snug fit of the acceptance (6,7).