Grinding Spindle Unit Coupling for Fast Belted Arm Changeover
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Solution Overview
Problem
Existing grinding machines require time-consuming and expertise-dependent assembly processes for changing grinding spindle units, particularly grinding arms, which increases downtime and introduces errors due to manual belt tensioning and complex mechanical connections.
Innovation Solution
The implementation of a zero-point clamping system with spaced clamping spigots and recesses on the grinding spindle unit and base unit, along with an elastically displaceable deflection wheel, allows for quick and precise coupling and decoupling, eliminating the need for manual belt threading and tensioning, and ensuring consistent belt tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional belt drive system is used with manual assembly, then the grinding spindle unit can be attached to the base unit, but the assembly process becomes time-consuming and requires special expertise for belt threading and tensioning
Solution Approach 1:
The belt is pre-installed on the deflection wheel and grinding wheel in the grinding spindle unit before attachment to the base unit. The drive wheel is designed with a specific geometry that automatically engages the belt at the correct tension when the grinding spindle unit is mounted on the base unit, eliminating the need for manual belt threading and tensioning during assembly.
Solution Approach 2:
The drive wheel's specific geometry enables automatic belt tensioning through the elastic displacement of the deflection wheel. When the grinding spindle unit is attached to the base unit, the contact surfaces engage and the drive wheel automatically contacts the belt with the correct force, creating the required tension without manual intervention. The system self-regulates the belt tension through the elastic deflection wheel.
2Reliability
If manual belt tensioning is performed during assembly, then the belt can be installed, but the process requires special expertise and increases the risk of assembly errors
Solution Approach 1:
The drive wheel's specific geometry and the elastic deflection wheel work together to automatically establish the correct belt tension when the grinding spindle unit is mounted on the base unit. The system self-regulates the tension through the elastic displacement of the deflection wheel, eliminating human error and the need for specialized expertise in belt tensioning.
Solution Approach 2:
The elastic deflection wheel changes its displacement parameter automatically based on the engagement of contact surfaces between the grinding spindle unit and base unit. This parameter change (elastic displacement) directly controls the belt tension, ensuring consistent and accurate tensioning without manual intervention.
3Productivity
If the grinding spindle unit is designed with detachable mounting, then the grinding arm can be changed quickly, but precise positioning and consistent belt tension become difficult to achieve
Solution Approach 1:
The belt is pre-installed on the deflection wheel and grinding wheel with specific geometric relationships established during manufacturing. The drive wheel is designed with a specific geometry that ensures automatic engagement at the correct position and tension when the grinding spindle unit is attached to the base unit, ensuring repeatable positioning.
Solution Approach 2:
The elastic deflection wheel provides automatic compensation for positioning variations through its elastic displacement. When the grinding spindle unit is attached to the base unit, the contact surfaces engage at a defined position, and the elastic deflection wheel adjusts its displacement to maintain consistent belt tension, ensuring repeatable positioning and tensioning across multiple attachments.
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 significantly reduces setup time, minimizes errors, and ensures repeatable, precise positioning of the grinding spindle unit, enhancing operator comfort and machine efficiency by automating belt tension and simplifying the assembly process.
Implementation Method 1
the other of the two deflection wheels (9) is mounted elastically displaceable in the grinding spindle unit (4) in the direction perpendicular to its axis of rotation (4L). a displacement limiter (11) is provided for the displacement of the elastically displaceable deflection wheel (9). The limitation of the displacement path for the elastically displaceable deflection wheel (9) is preferably chosen such that when the grinding spindle unit (4) is installed on the base unit (3), there is a predetermined tension in the belt (10)
Implementation Method 2
the drive wheel (7), the drive wheel (2) and the two deflection wheels (8, 9) are preferably designed as toothed belt wheels. When the grinding spindle unit (4) is installed on the base unit (3), the drive wheel (2) contacts the belt (10) between the first deflection wheel (8) and the second deflection wheel (9)
Data Source
Figure 1
Figure 2~3
AI summary
The invention relates to a grinding machine comprising an electric drive (1) with a drive wheel (2), wherein the drive (1) is arranged on a base unit (3) of the grinding machine, a grinding spindle unit (4) detachably arranged on the base unit (3) of the grinding machine, comprising a grinding tool (5), and a gear element (6) that transmits the rotary motion of the drive wheel (2) to the grinding tool (5).To simplify the changing of the grinding arm, the invention provides that the gear element (6) comprises: a drive wheel (7) mounted in the grinding spindle unit (4), which is in direct or indirect rotary connection with the grinding tool (5), two deflection wheels (8, 9) mounted in the grinding spindle unit (4), and a belt (10) guided around the drive wheel (7) and the deflection wheels (8, 9), wherein, in the mounted state of the grinding spindle unit (4) on the base unit (3), the drive wheel (2) between the two deflection wheels (8, 9) contacts the belt (10) and thereby drives it.