Mobile Grinding Machine Drive Mechanism for Opposing Rotation
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Solution Overview
Problem
Existing floor-grinding machines face issues with grinding disc rotation directionality, leading to unwanted grinding marks and operational complications in dusty environments due to complex and exposed drive mechanisms.
Innovation Solution
A mobile grinding machine with a concentric gear rim internally connected to the housing, supporting intermediate coupling cogwheels, and a seal along the outer periphery, allowing the grinding disc holders and housing to rotate in opposite directions, thus providing a simple and dust-protected drive mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a planetary gear is used to drive grinding disc holders in the opposite direction to the housing rotation, then the grinding disc holders rotate in the desired direction to avoid digging into the floor, but the drive mechanism becomes complicated and consists of many different parts
Solution Approach 1:
The drive mechanism is segmented into a stationary gear rim fixed to the housing and multiple independent pinion gears mounted on individual shafts. Each pinion gear independently engages with the gear rim to drive its corresponding grinding disc holder, simplifying the overall structure compared to a planetary gear system while achieving the required opposite rotation direction.
Solution Approach 2:
The gear rim acts as an intermediary element between the motor-driven shaft and the grinding disc holders. The pinion gears on the shafts engage with the gear rim to transfer and reverse the rotation direction, providing a simple and reliable method to achieve opposite rotation without complex transmissions.
2Device complexity
If belt driving is used to rotate grinding discs in a common direction, then the driving is simple, but the exposed belt is not safe in heavy part operation and is affected negatively by whirling dust in dirty environments
Solution Approach 1:
The gear rim is positioned inside the housing, and the pinion gears are nested within the housing structure. This nested arrangement protects the gear engagement mechanism from external dust contamination while maintaining structural simplicity. The entire drive mechanism is contained within the housing, preventing dust ingress and ensuring safe operation with heavy parts.
3Reliability
If an additional transmission is placed outside the housing to drive the grinding disc-supporting housing, then the grinding discs can rotate in the desired direction, but the transmission is exposed to dirty environments and driving bands are not suitable for such conditions
Solution Approach 1:
Instead of placing the transmission outside the housing as in conventional designs, the gear rim is fixed inside the housing and the shafts with pinion gears are positioned within the housing. This inverted arrangement protects the transmission mechanism from external dust and unclean environmental factors while achieving the required opposite rotation direction for the grinding disc holders.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration ensures efficient and reliable operation by preventing grinding disc self-embedding and maintaining machine functionality in dirty environments, reducing the risk of unwanted marks and improving operational safety.
Implementation Method 1
a gear rim, situated concentrically with a centre driving shaft is arranged non-turnably connected to the casing, that the grinding disc holder shafts support an intermediate coupling cogwheel each that co-operates non-turnably with the appurtenant shaft and with said gear rim
Implementation Method 2
a seal is arranged between the gear rim and the grinding support drum and that extends along their outer periphery
Data Source
AI summary
The invention relates to a device (1) at a mobile grinding machine (2) for stone materials and that comprises a rotatably driven disc-shaped housing (3), which is arranged to support a plurality of grinding disc holders (6) rotatably driven by a belt (5) or chain driven by a motor (4), which holders are distributed along the circumference of said housing (3) and supported by shafts (11) connected to said housing (3) at a mutual distance from each other. According to the invention, internally (7) in a casing (8), which surrounds a said housing (3), a gear rim (10), situated concentrically with a centre driving shaft (9), is arranged non-turnably connected to the casing (8). The grinding disc holder shafts (11) support an intermediate coupling cogwheel (18) each that co-operates non-turnably with the appurtenant shaft and with said gear rim. The gear rim (10) has a through opening (19) for the shaft (9) driven by the motor (4), and between the gear rim (10) and the housing (3), formed of a grinding supporting drum, a seal (31) is arranged that extends along their outer periphery (10A, 3A). Upon driving actuation of the motor (4), it is accomplished that the grinding disc holders (6) and the housing (3) are driven to rotate in different directions (100 and 200, respectively) in relation to each other.