DE29917631U1 - Device for forcibly traversing lane-bound vehicles, in particular longitudinal and circular scrapers on sewage treatment plants - Google Patents

Description

contraption

for compulsory proceedings

of lane-bound vehicles,

especially of longitudinal and circular scrapers

on sewage treatment plants.

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The invention relates to a forced movement of circular and longitudinal scrapers.

Up to now, circular and longitudinal scrapers have generally been driven on concrete roads with solid rubber or Vulkollan wheels and by three-phase gear motors.

With high and varying clearance loads in round and rectangular settling and flotation tanks, the scrapers tend to run at an angle, particularly in rectangular settling tanks. Another cause of skewing is the varying wear of the impellers. These adverse effects usually also cause further damage. This damage can be prevented by, for example, providing a speed monitor on the non-driven impellers that switches off the scraper. In this case, it is necessary to manually start the scraper again, if 24-hour operation is required, e.g. in the case of secondary settling tanks, also at night.

A problem with this type of clearing process is the fact that the increasing aging of the road surface also leads to shock loads on the undercarriages due to damage to the concrete road surface, and thus to increased wear on the running wheels and bearings, so that in addition to the necessary spare parts, the concrete road surfaces must be renovated at great expense due to the required permissible surface pressure or given equally expensive sheet metal covers. In winter, ice formation on the sheet metal cover can also cause the running wheels to slip. In these cases, the concrete road surfaces can be given a road heating system with heating lines in the concrete under the sheet metal cover, which represents a further increase in the ■<, acquisition and operating costs. A special form of

The scraper movement occurs with longitudinal scrapers and particularly twin longitudinal scrapers when the impellers slip on one side due to ice formation or due to different clearing loads or very high clearing loads, as is the case with sand shield scrapers, for example, which can lead to these scrapers being at an angle. The continuous movement of the scrapers is particularly important for settling tanks that have to be operated 24 hours a day, such as secondary clarifiers. In order to solve this task, some longitudinal scrapers are known, which are moved on steel rails and are driven by a three-phase gear motor via parallel racks, each with a steel gear wheel on a common shaft.

The task of improving and simplifying the method of the scrapers is solved in this invention as follows:

For this purpose, the longitudinal and circular scrapers are moved along roadways and, depending on the number of chassis, are driven by one or two forced drive devices. For damage to concrete roadways that has already occurred or is feared, running rails can also be used. Existing circular and longitudinal scrapers can also be retrofitted with forced drive devices. The scraper is continuously moved with a longer stroke by the carriers on the endless drive chain.

The invention is shown schematically in the drawing Fig. 1 to 4. From this it can be seen that a forced drive device under the scraper bridge ( 1 ) with brackets ( 14 ) in

Height of the roadway (8) is attached standing or lying down. The forced drive device consists of an endless chain (4) which is arranged between a deflection chain wheel (5) and a drive chain wheel (6) and is driven by a three-phase gear motor (7). Several drivers (3) are attached to the rotating endless chain (4), which engage parallel to the roadway (8) behind fixed drivers (9) which are screwed to the roadway (8) and thus force the scraper to move on the roadway (8). A guide profile (10) with wear strip (11) ensures the positioned engagement of the drivers. A chain tensioning device (13) is provided on the non-driving side of the chain to tension the chain.

Claims (13)

1. Device for the forced movement of circular and longitudinal scrapers on roadways ( 8 ) by means of forced drive devices which are arranged beneath the scraper bridge ( 1 ) parallel to the roadway ( 8 ), characterized in that the drivers ( 3 ) on the forced drive device are fastened circumferentially to the endless chain ( 4 ) arranged between the deflection sprocket ( 5 ) and the drive sprocket ( 6 ) and reach behind the fixed drivers ( 9 ) on the roadway ( 8 ) and thus move the scraper on the roadway ( 8 ) by means of a drive motor ( 7 ). 2. Device according to claim 1, characterized in that the drive devices for scrapers can be used in a standing position ( Fig. 1 and Fig. 2) or lying position ( Fig. 3 and Fig. 4). 3. Device according to one or more of the preceding claims, characterized in that the positive drive device is connected to a running wheel shaft ( 16 ) of the chassis or to the two opposite running wheel shafts of the chassis. In the case of direct drive of the running wheels, the positive drive device can be switched off as required by means of a coupling between the running wheel and the positive drive device. 4. Device according to one or more of the preceding claims, characterized in that when using two positive drive devices for a circular scraper extending over the diameter of the round settling tank, the drive motors ( 7 ) or also for longitudinal scrapers with a flat characteristic curve (e.g. motor with silumin rotor) are used or receive an electronic straight-run control for longitudinal scrapers or voltage compensation control for circular scrapers. 5. Device according to one or more of the preceding claims, characterized in that the chain ( 4 ), e.g. as a single or double roller chain, engages directly in the drivers ( 9 ) on the track ( 8 ) and in this way the scraper is moved on the track ( 8 ). 6. Device according to one or more of the preceding claims, characterized in that tolerances resulting from the longitudinal expansion of the scraper bridge ( 1 ) are absorbed by the dimensions of the rotating drivers ( 3 ) and the fixed drivers ( 9 ). 7. Device according to one or more of the preceding claims, characterized in that the drivers are designed, for example, as rollers, so that a continuous, low-friction movement of the scrapers is possible. 8. Device according to one or more of the preceding claims, characterized in that a large pitch within the engagement length of the positive drive device can be selected for the drivers ( 9 ) on the track ( 8 ). 9. Device according to one or more of the preceding claims, characterized in that the chain ( 4 ) receives a chain adjustment ( 13 ) to compensate for the chain elongation by adjusting the deflection chain wheel ( 5 ). 10 Device according to one or more of the preceding claims, characterized in that the chain ( 4 ) can be equipped with a chain tensioning device for compensating for smaller chain tensions and for damping vibrations. 11. Device according to one or more of the preceding claims, characterized in that forced drive devices used for scrapers have a guide ( 10 ) for the chain ( 4 ) with a replaceable slide bar ( 11 ) and, when the forced drive devices are used horizontally, an additional replaceable slide plate ( 12 ). The guide ( 10 ) with the replaceable slide bar ( 11 ) is used parallel to the track ( 8 ) in accordance with the basin radius, so that the drivers ( 3 ) are guided in a precise position when engaging behind the fixed drivers ( 9 ). 12. Device according to one or more of the preceding claims, characterized in that the drive motor ( 7 ) is provided with an overload protection device, e.g. as a slip clutch ( 15 ), for unforeseeable events. 13. Device according to one or more of the preceding claims, characterized in that the chain drive is provided with an automatic lubrication device which can be used with visual inspection and in any installation position.